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Mix proportion design of phosphoric acid-activated cementitious materials and microstructure evolution at high temperature Cement Concrete Comp. (IF 10.8) Pub Date : 2025-02-21
Linhui Meng, Fuchang Ouyang, Jiaxin Cheng, Ziming Wang, Bingqian Li, Xi Xu, Ping Duan, Yingcan Zhu, Zuhua Zhang, Ming Chen, Wentao HuangTo clarify the polymerization mechanism and high-temperature resistance of acid-activated cementitious materials. In this study, metakaolin was used as precursor, phosphoric acid solution served as the activator, and 0-6% of magnesia was incorporated to prepare acid-activated cementitious materials. The effects of P/Al (molar ratio of phosphorus to aluminum), L/S (mass ratio of activator to raw material)
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Competing mechanisms of cement hydrates and anhydrous phases at ambient and 120 °C carbonation Cement Concrete Comp. (IF 10.8) Pub Date : 2025-02-16
Hao Yu, Yi Jiang, Tung-Chai LingThe carbonation of a fresh cement matrix involves several parallel reactions, including the hydration of anhydrous phases and the carbonation of both anhydrous phases and cement hydrates. This study aims to elucidate the competing mechanisms of anhydrous phases and cement hydrates during high-temperature carbonation. We comparatively investigate the behaviors of three representative precursors (a)
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Efficiency of steel fibers in geopolymer and Portland cement concrete: Comparative evaluation of fiber bonding and crack bridging stress Cement Concrete Comp. (IF 10.8) Pub Date : 2025-02-16
Sohanth Tej Maganty, Kolluru V.L. SubramaniamThe bond of steel fibers with Geopolymer Concrete (GPC) and Portland Cement Concrete (PCC) is evaluated. The pullout response of the steel fiber is related to the cohesive fracture response of steel fiber-reinforced GPC and PCC. The crack propagation in fracture tests of GPC and PCC with hooked-end steel fibers at dosages of 25 kg/m3 and 45 kg/m3 is evaluated using digital image correlation (DIC).
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Porous Biochar-Assisted Aqueous Carbonation of Steel Slag as an Adsorptive Crystallization Modifier for Value-Added Cement Applications Cement Concrete Comp. (IF 10.8) Pub Date : 2025-02-20
Linshan Li, Yi Jiang, Tiefeng Chen, Xiaojian GaoCarbonated steel slag shows promise as a supplementary cementitious material. However, prolonged carbonation forms a dense CaCO3 layer, limiting carbonation efficiency and hydration activity, while uneven CaCO3 accumulation limits its performance in cement. This study introduces biochar as a nucleating agent to enhance the carbonation and hydration activity of steel slag. Results show that biochar
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Synergistic effects of nano-alumina and triisopropanolamine in Portland limestone cements with various sulfate levels Cement Concrete Comp. (IF 10.8) Pub Date : 2025-02-19
Sungwon Sim, Heongwon Suh, Seongmin Cho, Sumin Im, Jaeyeon Park, Junxing Liu, Sungchul BaeThis study evaluated the synergistic effects of nano-alumina and triisopropanolamine (TIPA) on the physicochemical properties of Portland limestone cement (PLC) with varying gypsum contents. The incorporation of nano-alumina and TIPA into PLC pastes with 3 and 9 wt. % of gypsum resulted in increased heat release during the initial dissolution period and total heat release of cement hydration, and significantly
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Reaction mechanisms of one-part and two-part slag-based binders activated by sodium carbonate and lime Cement Concrete Comp. (IF 10.8) Pub Date : 2025-02-17
Xiaojuan Kang, Zushi Tian, Clarence Edward Choi, Hailong YeOne-part alkali-activated slag (AAS) is a safer and more manageable alternative to a two-part formulation. This work compares the reaction mechanism, phase formation, microstructure and properties developments between one-part and two-part AAS pastes prepared by a combined lime (CaO) and sodium carbonate (Na2CO3) activator. The results show that the CaO-Na2CO3 combination effectively accelerates slag
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Early-age hydration of accelerated low-carbon cements for digital fabrication Cement Concrete Comp. (IF 10.8) Pub Date : 2025-02-16
Arnesh Das, Cedric Wenger, Lukas Walpen, Robert J. FlattDigital fabrication processes with concrete offer several advantages compared to conventional processes, however, a major criticism with related concrete mixes has been with regard to their high cement paste content and consequent carbon footprint. One of the ways to address this is to reduce ordinary Portland cement (OPC) content in such mixes by using supplementary cementitious materials. This paper
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Enhancing the rate-dependent cracking resistance of UHPC under mixed tensile-shear mode by calcined bauxite aggregate Cement Concrete Comp. (IF 10.8) Pub Date : 2025-02-18
Shaohua Li, Ole Mejlhede Jensen, Qingliang YuCalcined bauxite (CB) aggregate, characterized by porous microstructure and strong micromechanical property, has potential to mitigate macroscopic mechanical degradation of Ultra-high Performance Concrete (UHPC) from autogenous shrinkage microcracks. However, the rate-dependent cracking resistance of UHPC containing CB (UHPC-CB) under mixed-mode loading condition is not clear. Herein, the enhancing
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The role of foreign ions in Portland cement production and properties: A state-of-the-art review on phase formation, polymorphism and hydration Cement Concrete Comp. (IF 10.8) Pub Date : 2025-02-17
Ivo C. Carvalho, José S. Andrade Neto, Paulo R. de Matos, Barbara Lothenbach, Ana P. KirchheimAdopting alternative raw materials and fuels has significantly increased in the last few years. This practice introduces minor constituents (or foreign ions) into cement kilns, influencing the synthesis process and subsequent clinker/cement properties. This paper examined the impact of zinc, titanium, phosphorus, fluorine, and copper on clinker/cement characteristics, focusing on phase formation, polymorphism
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Carbon sequestration in aggregate and concrete by encapsulated biochar and carbonation: Experiment and simulation Cement Concrete Comp. (IF 10.8) Pub Date : 2025-02-16
Shuai Zou, Xi Chen, Man Lung Sham, Jian-Xin Lu, Chi Sun PoonBiochar is emerging as a novel method for carbon sequestration in concrete to reduce its carbon footprint, however, the high volume incorporation of biochar would unavoidably deteriorate the concrete performance due to biochar's drawbacks in high water absorption and low strength. Facing this conflict, a novel biochar-enabled core-shell aggregate (BCSA) developed by encapsulating biochar with cementitious
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Leaching behavior of lithium slag at various pH conditions Cement Concrete Comp. (IF 10.8) Pub Date : 2025-02-13
Chaowei Zheng, Zuhua Zhang, Yingcan Zhu, Qiang Ren, John L. Provis, Qianqian Wang, Zhengwu JiangTo explore possible safe valorization routines for lepidolite lithium slags (LS) in different cement systems, this paper investigates their fundamental composition features and dissolution mechanisms under various pH conditions. Lepidolite LS is mainly divided into two types: high calcium LS with mineral phases mainly composed of anorthite and gypsum, and low calcium LS mainly comprising nosean and
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Enhancement mechanism of wet-carbonated recycled concrete aggregates subjected to calcium-rich and magnesium-rich industrial reclaimed wastewater sources Cement Concrete Comp. (IF 10.8) Pub Date : 2025-02-12
Ning Li, Cise UnluerWhile efficient in enhancing recycled concrete aggregates' (RCAs) performance, wet carbonation demands significant amounts of water. Addressing this, we investigated carbonation of RCAs in tap-water (TW), concrete batching plant wash-water (WW), and reject brine (RB). Composition and microstructure of carbonated RCAs and their impact on reaction and mechanical properties of recycled aggregate concrete
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Improving the carbonation resistance of supersulfated cement by nano SiO2 and silica fume Cement Concrete Comp. (IF 10.8) Pub Date : 2025-02-12
Heng Chen, Zhongxu Song, Binbin Liu, Guilong Sun, Pengkun Hou, Qinfei Li, Yang Wang, Pengyu Zhang, Xin ChengSupersulfated cement (SSC) is a low-carbon material with limited carbonation resistance due to its high content of easily carbonated components (AFt) and low content of carbonation-resistant components (C-(A)-S-H gel and portlandite). This study aims to utilize reactive siliceous materials (nano-silica (NS) and silica fume (SF)) to optimize the product composition of SSC and enhance its carbonation
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Hydration and physicochemical immobilization mechanisms of pozzolanic-hazardous waste in supersulfated cement Cement Concrete Comp. (IF 10.8) Pub Date : 2025-02-10
Jiaxing Ban, Jian-Xin Lu, Bin Ma, Ligang Peng, Hongjian Du, Dingqiang Fan, Jun Yao, Baoshan Xing, Chi Sun PoonOrdinary Portland cement (OPC) is a versatile cement binder suitable for solidifying hazardous wastes, while its production induces significant carbon emissions. This study developed a novel low-carbon supersulphated phosphogypsum slag cement (SPSC) with the inclusion of pozzolanic-hazardous waste and investigated the synergetic mechanism of its pozzolanic reaction and immobilization behavior. The
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Digital-volume-correlation-assisted crack extraction using X-ray computed tomography images of cementitious materials Cement Concrete Comp. (IF 10.8) Pub Date : 2025-02-07
Shuxian Hong, Zhongbo Yuan, Disheng Pan, Chuan Kuang, Biqin Dong, Shengxin FanThe image segmentation results for microcrack detection suffer from poor continuity and integrity due to noise, grayscale inhomogeneity, and the very small size of microcrack voxels. Strain information is introduced to aid crack recognition and reduce the impact of image accuracy on crack detection. A new crack detection method is proposed that combines image processing and digital volume correlation
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Optimization and performance regulation of pipe piles based on nano-calcium silicate hydrated (n-C-S-H) Cement Concrete Comp. (IF 10.8) Pub Date : 2025-02-07
Xiaofeng Han, Penggang Wang, Zijun Ling, Rihong Zhang, Zhenxing Du, Mengzhuo Sun, Xiaomeng Sui, Dongxuan WeiPrestressed high-strength concrete (PHC) pipe piles are widely used in various construction projects. However, higher steam curing temperatures and times in the preparation of pipe piles severely affect material performance, while increasing cost and environmental pollution. This study investigates the use of nanoscale calcium-silicate-hydrate (n-C-S-H) to reduce curing temperature and time, ensuring
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New insights into the retardation mechanism of phosphorus slag on the early cement hydration Cement Concrete Comp. (IF 10.8) Pub Date : 2025-02-07
Shiyu Zhuang, Qiang Wang, Yichen Shan, Ruiquan Jia, Zihan ZhouPhosphorus slag (PS) is widely reported to retard the cement hydration due to the existence of phosphorus and fluorine in it. However, the key role and its corresponding mechanism have not been fully reported. In this study, the effects of PS on the early cement hydration were investigated from the insights of solid phases, aqueous species and microstructures evolution. Results show that PS remarkably
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Development of 3D-printable alkali-activated GGBFS and fly ash binder-based mortars with concrete demolition waste as aggregates Cement Concrete Comp. (IF 10.8) Pub Date : 2025-02-06
M. Gurunandan, Aparna Sai Surya Sree Nedunuri, Jayant Tanwar, Prakash Nanthagopalan, Salman Muhammad3D-printable alkali-activated mortar mixtures using concrete demolition waste (CDW) as aggregates, which are pumpable, extrudable, buildable up to 1000 mm with an open time of 180 minutes were developed in this study. The mixtures provided a minimum compressive strength of 50 MPa at 28 days age. The effect of various parameters such as binder composition, water-to-binder ratio, molar modulus and activator
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Tensile behavior simulation of ECC/SHCC at subzero temperatures based on a fiber/interface combination constitutive model Cement Concrete Comp. (IF 10.8) Pub Date : 2025-02-06
Yanlin Huo, Xiaoyu Han, Chunran Wu, Dong Lu, Huayang Sun, Zhitao Chen, Yingzi Yang, Victor C. LiThe performance degradation of Engineered Cementitious Composites/Strain-hardening cementitious composites (ECC/SHCC) at subzero temperatures is becoming a widespread concern. However, experimental testing and data acquisition in cold environments are very difficult and demanding. It is an inevitable trend to use numerical simulation for research. In this paper, a finite element model based on a fiber/interface
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X-ray computed tomography-based characterisation of graphene nanoplatelets re-agglomeration in hardened cement composites Cement Concrete Comp. (IF 10.8) Pub Date : 2025-02-05
Zhaohua Wang, Meini Su, Yong Wang, Cise Unluer, Suning LiGraphene Nanoplatelets (GNPs) have been found to be an effective additive for enhancing the mechanical strength of cementitious materials, attributed to the role they play as nucleation sites. However, there is not a direct correlation on the enhancing effect of graphene with increasing graphene dosage, resulting in different optimal dosages for different binders and mix designs. This study aims to
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Innovative ZIF-8 modified ER@EC microcapsules: Enhancing slow-release and longevity for superior self-healing in cementitious materials Cement Concrete Comp. (IF 10.8) Pub Date : 2025-02-04
Shiyu Zhang, Zijian Song, Haoliang Zhang, Zilang Huang, Hui Rong, Linhua Jiang, Yunsheng Zhang -
A novel electromigration-based microbial self-healing strategy for existing concrete structures Cement Concrete Comp. (IF 10.8) Pub Date : 2025-02-04
Zhenxiao Bi, Jing Xu, Hao Sun, Qing Chen, Hehua ZhuThe prevailing self-healing of concrete cracks based on microbial-induced carbonate precipitation (MICP) has been limited to new structures since healing agents have to be pre-embedded during fresh mixing stage. In this study, a novel microbial self-healing strategy based on electromigration of bacterial spores is proposed for existing concrete. To this end, the feasibility of this new method is first
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Prediction of microbial-induced calcium carbonate precipitation for self-healing cementitious material Cement Concrete Comp. (IF 10.8) Pub Date : 2025-02-03
Hsiao Wei Lee, Seyed Ali Rahmaninezhad, Li Meng, Wil V. Srubar III, Christopher M. Sales, Yaghoob (Amir) Farnam, Mija H. Hubler, Ahmad R. NajafiMicrobial-induced calcium carbonate precipitation (MICCP) is a biomineralization process utilizing microbial metabolic activities to precipitate calcium carbonate (CaCO3). In recent years, there has been increasing interest in the application of MICCP in self-healing cementitious materials. In this research, the chemical and enzyme kinetics of MICCP were numerically modeled, focusing on the ureolytic
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Relation between pore structure uniformity and compressive strength of iron tailings mortar Cement Concrete Comp. (IF 10.8) Pub Date : 2025-01-31
Yi Li, Mengxuan Yu, Wei Li, Xin BianPore structure uniformity is one of the key factors affecting the compressive strength of mortar. This study proposed two new methods to characterize the uniformity of pore distribution and established their relationship with compressive strength. Compressive and pore structure tests were carried out on ordinary mortar, iron tailings mortar, and iron tailings mortar containing basalt fibers and polyacrylate
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Effects and mechanisms of the hybrid-modified SAP with calcium sulfate dihydrate on the properties of UHPC Cement Concrete Comp. (IF 10.8) Pub Date : 2025-01-31
Deyu Kong, Zhentao Han, Zhiyang Chen, Chenxu Ni, Haotian Wu, Yaqian Liang, Kui He, Jintao LiuIn the synthesis process of superabsorbent polymer (SAP), calcium sulfate dihydrate (C$H2) dispersion in water or colloidal silica sol (CSS) was used for the modification of SAP. The effects of modification on water absorption of SAP in water or saturated calcium hydroxide (CH) solution and the impacts and mechanism of the modified SAP on the performance of UHPC were investigated. The results showed
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Integrated assessment of magnesium phosphate cement repaired concrete from the perspective of mechanical, geometric and electrochemical compatibility Cement Concrete Comp. (IF 10.8) Pub Date : 2025-01-30
Sijia Liu, Ken Yang, Long Yu, Linglin Xu, Qiang Yuan, Kai Wu, Zhenghong YangMagnesium phosphate cement (MPC) has gained more and more attention in the field of rapid repair and strengthening of normal concrete and reinforced concrete structures. Although the performance of MPC itself is of great concern, its compatibility with existing concrete is poorly understood. An effective testing method is necessary to assess the reliability of utilizing MPC mortar repairing construction
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Improving the performance of SiO2 nanoparticles in portland-limestone cementitious systems using silica-limestone composites Cement Concrete Comp. (IF 10.8) Pub Date : 2025-01-29
Qitong Liu, Payam Hosseini, Bu WangThis study examines the effectiveness of doping SiO2 nanoparticles onto limestone substrates to mitigate nanoparticle agglomeration, thereby enhancing their performance through improved dispersion within the cement paste matrix. SiO2 nanoparticles were doped onto the limestone particles using the wet doping method, and the resulting SiO2-nanoparticle-limestone composite was incorporated into cement
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Improved microstructure and compressive strength of pastes and mortars containing MgO-SiO2 cement produced by combined calcination of MgCO3 and kaolin Cement Concrete Comp. (IF 10.8) Pub Date : 2025-01-28
J.P.B. Batista, G.C. Cordeiro, L.F. Ribeiro, J.C.B. MoraesMgO-SiO2 cement was produced by combined calcination of MgCO3 and kaolin as raw materials, at a MgCO3/kaolin mass ratio of 3.0 and 800 °C for 45 min. Separate calcination of MgCO3 and kaolin was also conducted under the same conditions. Raw materials were characterized based on their chemical composition, bulk density, particle size distribution, XRD, FTIR, and BET specific surface area, and the MgO-SiO2
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An innovative structural energy storage solution using fly ash-cement composites for net-zero energy buildings Cement Concrete Comp. (IF 10.8) Pub Date : 2025-01-27
Ruidan Liu, Pan Feng, Zhaolong Liu, Long Yuan, Guanghui Tao, Zhenqi Yu, Xiangyu Meng, Jian ChenThe rapid advancement of renewable energy highlights the urgent need for safe, cost-effective, and scalable energy storage solutions, particularly for net-zero energy buildings. In this study, we introduce an innovative energy storage solution utilizing fly ash-cement composites (FCS) as multifunctional components. The FCS, incorporating fly ash as a mineral admixture, achieves a refined pore structure
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Influence of the water absorption-release processes of superabsorbent polymer with varying amounts of extra-entrained water on the surrounding cement paste Cement Concrete Comp. (IF 10.8) Pub Date : 2025-01-27
Fangyu Chen, Jingjing Lyu, Xinchun Guan, Jing Qiao, Heqing GouThis paper investigates the influence of the water absorption-release process of superabsorbent polymer (SAP) with varying amounts of extra-entrained water on the properties of the surrounding cement paste and the macroscopic cement paste. 1H low-field nuclear magnetic resonance (NMR) was used to analyze the water absorption-release process of SAP. The macroscopic properties, including the void system
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Corrosion resistance of zinc in a low-carbon binder with belitic calcium sulfoaluminate cement Cement Concrete Comp. (IF 10.8) Pub Date : 2025-01-27
Wenxuan Li, Jinjie ShiThis study investigated the passivation ability and chloride-induced corrosion behavior of galvanized steel in the pore solutions of belitic calcium sulfoaluminate (BCSA) cement. Pure zinc was used to simulate the galvanized coating, and ordinary Portland cement (OPC) solution was also tested for the comparison purpose. A comparable passivation behavior was observed for pure zinc in the OPC solution
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Feasibility study of using carbonated and ultrasound treated electric arc furnace slag as a nano-enhanced supplementary cementitious material Cement Concrete Comp. (IF 10.8) Pub Date : 2025-01-27
Jiongqi Chen, Weiyu Li, Wenjie Huang, Qiujin Chen, Yuwei Ma, Mingzhong Zhang, Zongjin Li, Jiyang Fu, Xiaowei OuyangAs a primary by-product of the electric arc furnace (EAF) steelmaking process, the relatively low carbonation capacity of EAF slag limits its use as a carbon-sequestering construction material. To address this limitation, this study proposed a two-step chemical-physical modification approach. First, a gas-solid carbonation process was applied, where humidity, temperature, CO₂ concentration, and carbonation
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Degradation behavior and self-healing mechanism of force-Cl- triggered microcapsule/ cementitious composites Cement Concrete Comp. (IF 10.8) Pub Date : 2025-01-25
Yanxuan Ma, Shuaifei Wang, Meiyu Li, Gongbin Wang, Jiatong Liu, Yuhua Gao, Peng Wang, Zhipeng ZhangThe performance of microcapsules in terms of “chloride response” and their electrochemical remediation mechanism is investigated. Electrochemical testing methods are used, i.e., kinetic potential polarization and electrochemical impedance testing. The variation rules of corrosion behavior of self-healing cementitious composites with different contents of microcapsules, both intact and pre-damaged,
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Experimental investigation on the bond performance of a hybrid lap-spliced connection of GFRP and stainless steel bars in concrete Cement Concrete Comp. (IF 10.8) Pub Date : 2025-01-25
Jiafeng Zhou, Jitong Zhao, Mengyan Peng, Marco Liebscher, Viktor Mechtcherine, Steffen Marx, Chongjie KangThis paper investigates the bond performance of a hybrid lap-spliced connection of glass fiber reinforced polymer (GFRP) bars and stainless steel bars in concrete. To gain a comprehensive understanding, micro-level and macro-level mechanical studies are conducted. First, the microstructural characterization of GFRP bars is performed to comprehend the specific material features. Then, cantilever tests
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Estimating RC corrosion distribution from surface cracks using mesoscale analysis integrated with machine learning Cement Concrete Comp. (IF 10.8) Pub Date : 2025-01-25
Tianyu Shao, Jie Luo, Kohei NagaiUnderstanding the degree of reinforcing bar corrosion in reinforced concrete (RC) structures is crucial for evaluating their residual performance. This study proposes a simulation system for estimating the distribution of corrosion along the rebar of a RC beam member based on surface crack widths. The system integrates the rigid body spring model (RBSM) with machine learning methods. The inputs are
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Effect of silica fume on corrosion resistance of cement-based materials under carbonic acid water environment Cement Concrete Comp. (IF 10.8) Pub Date : 2025-01-25
Jianhui Liu, Lurun Wu, Junmin Zhu, Hengrui Jia, Leping Liu, Shichong Zhang, Cong Yang, Zheng Chen, Caijun ShiThe effect of silica fume (SF) on corrosion depth, mass loss and compressive strength of mortar specimens over time under carbonic acid water environment were studied in this study. In addition, the thermal gravimetric analysis (TG-DTG), X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR) and scanning electron microscopy (SEM) were used to analyze the product evolution and microstructure
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Unveiling the synergistic effects of stray current and high hydraulic pressure on chloride transport in ultra-high-performance concrete Cement Concrete Comp. (IF 10.8) Pub Date : 2025-01-25
Mingyue Chen, Xin Kang, Yongqing Chen, Renpeng ChenUltra-high-performance concrete (UHPC) is a promising material for constructing future deep underground spaces owing to its exceptional toughness and durability. Nevertheless, the potential impact of stray currents and high hydraulic pressure on the durability of UHPC in deep underground electric projects (such as subways and electric railways) remains elusive. Moreover, existing experimental setups
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Advanced spectroscopic and microscopic insights into cement biodeterioration in sulfur-rich sewer systems Cement Concrete Comp. (IF 10.8) Pub Date : 2025-01-24
Janette Ayoub, Tony Pons, Marielle Guéguen Minerbe, Guilhem Simon, Gwénaël Gouadec, Sabrina Guérin, Vincent Rocher, Marc Offroy, Mario MarchettiThe biodeterioration of cementitious materials within sewer networks remains a critical problem that compromises the structural integrity and lifespan of these infrastructures essential to water treatment. This study pioneers the use of micro-Raman spectroscopic mapping, coupled with chemometric tools, to investigate the impact of high H2S levels and bacterial activity on high-resistance cementitious
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Study on the performance of polyester fibers modification system for low carbon magnesium silicate-based cementitious materials Cement Concrete Comp. (IF 10.8) Pub Date : 2025-01-24
Yuan Jia, Junwei Zhu, Enci Zhao, Jingxi Zhang, Shibo Li, Yaoting Jiang, Tingting Zhang, Libo LiuTo mitigate the environmental hazards posed by discarded plastics, polyester fibers produced from such waste have been incorporated into building composites. However, the durability of polyester fibers in cementitious environments is compromised by high alkalinity, which may lead to resource wastage. In this study, polyester fibers were embedded in magnesium silicate hydrate to develop a novel, highly
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Bottom-up innovation for sustainable leakproof Engineered Cementitious Composites (ECC) pipe: Design method, ECC material, and pipe structure Cement Concrete Comp. (IF 10.8) Pub Date : 2025-01-22
He Zhu, Jinping Ou, Dongsheng Li, Aamer Bhutta, Georgios Zapsas, Waleed Nasser, Mohammed Mehthel, Oscar Salazar, Victor C. LiLow-carbon, low-cost, and durable water pipelines are urgently needed for sustainable cities. In this study, low carbon, cost-effective, leakproof Engineered Cementitious Composites (ECC) pipes were developed benefiting from the proposed ECC pipe design model and material innovation. The proposed model has been experimentally validated on ECC beam and ECC pipe. The developed desert sand Engineered
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Characterizing and modelling the bond-slip behaviour of steel bars in 3D printed engineered cementitious composites Cement Concrete Comp. (IF 10.8) Pub Date : 2025-01-22
Meng Chen, Kanghao Yu, Tong Zhang, Yuting WangEmbedding rebars in 3D printed engineered cementitious composites (3DP-ECC) promises to improve the structural toughness and loading capacity, while a robust bond between them is critical for digital construction with reinforcements. This paper presents a series of pull-out tests on the bond behaviour between rebars and 3DP-ECC to investigate the effects of variable rebar arrangement direction, diameter
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Unbiased rheological properties determined by adversarial training with Bingham equation Cement Concrete Comp. (IF 10.8) Pub Date : 2025-01-21
In Kuk Kang, Tae Yong Shin, Jae Hong KimThe Bingham model is generally used to describe the flow of cement-based materials, and its parameters, such as yield stress and plastic viscosity, are measured using a rheometer. However, the rheological measurement does not provide the unique Bingham parameters for a single material when rheometers take different rheological geometries or measuring protocols. This study constructs a model that can
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Enhancing photocatalytic efficiency and interfacial bonding on cement-based surfaces by constructing CaO-TiO2 hybrid catalysts Cement Concrete Comp. (IF 10.8) Pub Date : 2025-01-21
Xunli Jiang, Jian-Xin Lu, Yuqing Zhang, Chi Sun PoonThe application of titanium dioxide (TiO2) coating in cement-based materials faces challenges regarding its durability. This study presented the concept of ‘induced bonding’ for enhancing coating adhesion. By modifying TiO2 with CaO, nucleation sites were constructed on its surface, inducing the growth of hydration products and connecting the catalytic materials to the substrate. As a result, a novel
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Nano-mechanism of graphene oxide reinforced fly ash-slag based geopolymer materials to form high polymerization degree C-(A)-S-H: A new view of physical-chemical synergistic effect Cement Concrete Comp. (IF 10.8) Pub Date : 2025-01-17
Ben Li, Kai-Hang Li, Ying-Wu Zhou, Hu Xu, Can-Hao Zhao, Ying Yu, Zhuo-Cheng LiThis study mainly investigated the effect and mechanism of graphene oxide (GO) on the nucleation of C-(A)-S-H in fly ash-slag based geopolymer. A variety of material characterization methods and electronic structure analysis methods were combined to analyze the nanostructure changes and electronic transitions generated during the reduction of GO in an alkaline environment. Based on this change, the
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Multi-scale analysis of degradation mechanisms in magnesium phosphate cement paste under wet-dry cycling Cement Concrete Comp. (IF 10.8) Pub Date : 2025-01-17
Zihan Zhou, Haisen Jin, Qinyuan Liang, Qiang Wang, Jianshuai Hao, Shiyu ZhuangMagnesium phosphate cement paste (MPC) is a promising rapid-repair material for pavements but is prone to degradation under wet-dry (W-D) cycling, which limits its durability. Current research lacks a detailed understanding of the damage and degradation mechanisms of MPC under these conditions. This study investigates the macroscopic mechanical behavior and mesoscopic damage progression of MPC during
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Improved corrosion resistance of 316 stainless steel in calcium sulfoaluminate cement incorporated with red mud and citrate Cement Concrete Comp. (IF 10.8) Pub Date : 2025-01-16
Xiaocheng Zhou, Jinjie ShiThe incorporation of red mud (RM) in calcium sulfoaluminate (CSA) cement offers a cost-effective and environmentally friendly solution for rehabilitation engineering, resulting in reduced carbon emissions. However, it may further reduce the setting time of CSA cement, thus causing inconvenience during construction. Moreover, the corrosion resistance of steel in CSA cement blended with RM is unclear
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Unlocking the role of silica gel in enhancing mechanical properties and water resistance of magnesium oxysulfate cement Cement Concrete Comp. (IF 10.8) Pub Date : 2025-01-15
Tingting Zhang, Qun Guo, Xiaoyang Chen, Chris Cheeseman, Hao Wang, Jun ChangThe continuous hydration of residual periclase to form brucite with expansive stress remains an issue for the utilization of hardened magnesium oxysulfate (MOS) cement in humid environments. This study explored converting residual periclase and brucite into magnesium silicate hydrate (M–S–H) gel to enhance the mechanical properties of MOS cement after water immersion. Changes to the hydration process
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Mechanism analysis of microwave-carbonation solidification for carbide slag-based low-carbon materials Cement Concrete Comp. (IF 10.8) Pub Date : 2025-01-15
Run-Sheng Lin, Yongpang Liao, Chaoshu Fu, Ting-Hong Pan, Rongxin Guo, Xiao-Yong WangThis study proposes an innovative strategy for compacting carbide slag-based low-carbon bricks (CS-LCB) through a combination of microwave and carbonation curing, aiming to improve the properties through microwave pretreatment combined with carbonation curing and to realize the preparation of low-carbon materials. The effects of microwave pretreatment on the main properties of CS-LCB-containing limestone
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Evaluation of the induced mechanical deterioration of ASR-affected concrete under varied moisture and temperature conditions Cement Concrete Comp. (IF 10.8) Pub Date : 2025-01-15
O.D. Olajide, M.R. Nokken, L.F.M. SanchezMoisture and temperature are critical for developing alkali-silica reaction (ASR) in concrete. However, the influence of these exposure conditions on ASR-induced deterioration, specifically mechanical property losses, has not been well studied. To further our understanding, concrete cylinders made with Spratt reactive coarse aggregates and boosted in alkalis to 5.25 kg/m³ Na2Oeq were manufactured and
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Leveraging incinerator bottom ash for mitigating early age shrinkage in 3D printed engineered cementitious composites Cement Concrete Comp. (IF 10.8) Pub Date : 2025-01-14
Jie Yu, Fengming Xu, Hanghua Zhang, Junhong Ye, Jiangtao Yu, Jian-Guo Dai, Yiwei WengThis study investigates the use of incinerator bottom ash (IBA) as a supplementary cementitious material to mitigate early age shrinkage in 3D printed engineered cementitious composites (3DP-ECC). IBA was processed through milling and thermal treatment before incorporation into 3DP-ECC. The fresh and hardened properties, hydration kinetics and products, early age shrinkage, and microstructural characteristics
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Sustainable geopolymer synthesis catalyzed by hexafluorosilicic acid: A low-energy approach using phosphate industrial waste Cement Concrete Comp. (IF 10.8) Pub Date : 2025-01-11
H. Majdoubi, Y. Haddaji, M. Nadi, H. Hamdane, S. Mansouri, R. Boulif, Y. Samih, M. Oumam, B. Manoun, J. Alami, Y. Tamraoui, H. Hannache -
Enhancing the workability retention of one-part alkali activated binders by adjusting the chemistry of the activators Cement Concrete Comp. (IF 10.8) Pub Date : 2025-01-10
Han Gao, Iman Munadhil Abbas Al-Damad, Ayesha Siddika, Taehwan Kim, Stephen Foster, Ailar HajimohammadiAlkali activated materials (AAMs), are gaining traction as sustainable alternatives to traditional Portland cement. However, their practical application is often limited by rapid setting times and poor workability. Although sodium carbonate and silica fume have been applied in synthesising AAMs, their effects on the reaction kinetics and structural development of one-part AAMs remain unknown. This
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Developing high-strength dry-cast pastes by incorporating carbonatable chlorellestadite Cement Concrete Comp. (IF 10.8) Pub Date : 2025-01-10
Hanxiong Lyu, Shipeng Zhang, Chi Sun PoonA water-insoluble mineral, chlorellestadite (CE, Ca10(SiO4)3(SO4)3Cl2), would be formed in the preheater coatings of cement kilns when using chlorine-containing plastics as alternative fuels. This work investigated the viability of employing CE as an SCM to enhance the utilization of chlorine-containing fuels in cement-making. Substituting 20 wt% CE in dry-cast pastes (CE20), which were prepared by
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Energy storage properties and mechanical strengths of 3D printed porous concrete structural supercapacitors reinforced by electrodes made of carbon-black-coated Ni foam Cement Concrete Comp. (IF 10.8) Pub Date : 2025-01-09
Qifeng Lyu, Yalun Wang, Dongjian Chen, Shiyuan Liu, Justin Mbabazi, Pinghua Zhu, Jiquan Lu, Shaowei Wang, Fengxiang YinTo increase the manufacturing efficiency of rechargeable concrete which can alleviate the problem that intermittent new energy is difficult to integrate into the power grid, a new type of concrete structural supercapacitor (CSSC) was proposed here by using mortar-extrusion 3D printing with the carbon-black-coated Ni foam being the electrodes and reinforcement. The printability, energy storage properties
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Insights into the synergistic action of initial hydration and subsequent carbonation of Portland cement Cement Concrete Comp. (IF 10.8) Pub Date : 2025-01-09
Jionghuang He, Yingliang Zhao, Yong Tao, Peiliang Shen, Chi Sun PoonPretreatment-induced initial hydration would significantly influence subsequent carbonation. However, the evolution of microstructure and performance resulting from the synergistic action of hydration and carbonation remains systematically unexplored. This study investigates carbonation kinetics, microstructure and micro/macro mechanical properties of carbonated cement pastes (CCPs) under the synergistic
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Porous biochar for improving the CO2 uptake capacities and kinetics of concrete Cement Concrete Comp. (IF 10.8) Pub Date : 2025-01-09
Matthieu Mesnage, Rachelle Omnée, Johan Colin, Hamidreza Ramezani, Jena Jeong, Encarnacion Raymundo-PiñeroCarbonation is a natural process in concrete where atmospheric CO2 diffuses into the pores of the material and reacts with cement hydrates to form calcium carbonate. Although this process can help to sequester atmospheric CO2 and mitigate rising levels in urban areas, it slows down over time, resulting in low CO2 uptake over the service life of concrete. This study proposes a sustainable method to
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New insights into the interaction between seawater and CO2-activated calcium silicate composites Cement Concrete Comp. (IF 10.8) Pub Date : 2025-01-09
Farzana Mustari Nishat, Ishrat Baki Borno, Adhora Tahsin, Warda AshrafThis article presents the investigation findings on the combined effect of seawater and carbonation curing on two types of binders – blended binder containing blast furnace slag (BFS) and laboratory synthesized pure β-C2S. Samples were prepared using freshwater and seawater as mixing water. After casting, the samples were exposed to accelerated CO2 curing for 7 days and then exposed to seawater for
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Microstructure transformation of MCM-41 modified cement paste subjected to thermal load and modelling of its pore size distribution Cement Concrete Comp. (IF 10.8) Pub Date : 2025-01-09
Maciej Szeląg, Patryk Rumiński, Rafał PanekThis study examines the effects of highly reactive, mesoporous MCM-41 silica on the thermal resistance and microstructural stability of Portland cement paste (CP). The motivation is to enhance cement composites (CC) properties using supplementary cementitious materials (SCMs), addressing environmental challenges from global cement production. The research involved modifying CP with 0–2 wt% MCM-41 and
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Mechanical performance enhancement of UHPC via ITZ improvement using graphene oxide-coated steel fibers Cement Concrete Comp. (IF 10.8) Pub Date : 2025-01-08
Yuan Gao, Zhangjianing Cheng, Jiajian Yu, Xiaonong Guo, Yanming Liu, Weiqiang ChenBy virtue of its superior strength, high toughness, and low porosity, ultra-high-performance concrete (UHPC) has a wide range of application prospects in construction engineering. However, the interfacial transition zone (ITZ) formed between the cementitious matrix and steel fiber seriously restricts the steel fiber's strength utilization rate in UHPC. Hence, in this work, graphene oxide (GO) is employed
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Carbon capture and storage CO2 foam concrete towards higher performance: Design, preparation and characteristics Cement Concrete Comp. (IF 10.8) Pub Date : 2025-01-07
Dingqiang Fan, Jian-Xin Lu, Xue-Sen Lv, Takafumi Noguchi, Rui Yu, Chi Sun PoonThis study introduces a novel strategy for carbon capture and utilization by incorporating CO2 into foams to develop CO2 foam concrete (CFC) with high performance. A conceptual design approach for CFC was first proposed by incorporating tailor-made CO2 foam into an optimized cement-based paste. The engineered CO2 foam exhibited fine size and good stability, but increasing CO2 concentration decreased