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Effect of ICCP on bond performance and piezoresistive effect of carbon fiber bundles in cementitious matrix Cement Concrete Comp. (IF 10.8) Pub Date : 2024-06-26 Yewangzhi Tao, Jiarong Liu, Dawei Zhang, Zhiyu Xie, Jiaxin Hong
The purpose of this study is to lay a foundation for developing a triple-functional system of impressed current cathodic protection, structural strengthening, and structural health monitoring (ICCP-SS-SHM) regarding carbon fabric reinforced cementitious matrix (CFRCM) material performance, and promote the utilization of seawater sea-sand resources to alleviate the shortage of freshwater river sand
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Assessing the durability performance of high belite cement incorporating fly ash under long-term temperature variations Cement Concrete Comp. (IF 10.8) Pub Date : 2024-06-25 Haoyu Zeng, Ming Jin, Wenwei Li, Chang Gao, Yuefeng Ma, Qingfeng Guan, Boyi Li, Jiaping Liu
The widespread use of ordinary Portland cement (OPC), which has a significant carbon footprint, greatly contributes to the climate crisis. High belite cement (HBC) is renowned for its low-carbon characteristics, resulting in an evident reduction in both energy consumption and CO emissions. Fly ash (FA), an industrial solid waste material, is commonly employed in the construction of mass concrete structures
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Effect of seawater on hydration of magnesium potassium phosphate cements Cement Concrete Comp. (IF 10.8) Pub Date : 2024-06-25 Biwan Xu, Barbara Lothenbach
Magnesium potassium phosphate (MKP) cement-based materials could be suitable for concrete repairs in marine environments. In this study, the effect of seawater on the hydration of MKP cements at different magnesium-to-phosphate molar ratios was investigated using mainly diluted suspensions. Compared to deionized water, seawater can slow down MKP cement hydration, which is attributed to the combined
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Effects of heat, moisture/water, and compressive force on frequency response spectrum of super sensitive carbon nanofiber aggregates (SSCNFA) Cement Concrete Comp. (IF 10.8) Pub Date : 2024-06-21 Bhagirath Joshi, Jiaji Wang, Xiaonan Shan, Y.L. Mo, Thomas T.C. Hsu
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The long-term development in the micro- and macro-properties of geopolymers made from different fly ashes Cement Concrete Comp. (IF 10.8) Pub Date : 2024-06-21 Xiaonan Ge, Xiang Hu, Caijun Shi
This paper systematically presented the trend of mechanical properties and micro-characteristics of fly ash-based geopolymer pastes up to 730 days (d) and analyzed the reason causing the divergent tendencies among the geopolymers synthesized with five Class F fly ashes (FFA). The test results showed that the geopolymer specimens had continuously increased compressive strength due to the sustained geopolymerization
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Highly reactive carbonated recycled concrete fines prepared via mechanochemical carbonation: Influence on the early performance of cement composites Cement Concrete Comp. (IF 10.8) Pub Date : 2024-06-21 Yingliang Zhao, Kai Cui, Jionghuang He, Yong Zheng, Peiliang Shen, Chi Sun Poon, Guangmin Peng, Ruilai Guo, Daohui Xia
Carbonated recycled concrete fines (RCF) possess the potential to serve as supplementary cementitious materials (SCMs). However, calcium carbonate (c) formed during traditional carbonation methods generally shows low reactivity. Moreover, the remaining calcium silicate hydrate (C-S-H) with a low Ca/Si ratio exhibits enhanced resistance to decalcification, leading to the formation of lower content of
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NaAlO2 activated slag and MSWI bottom ash: Phase assemblages and thermodynamic assessment of long-term leaching behavior Cement Concrete Comp. (IF 10.8) Pub Date : 2024-06-15 Tao Liu, Yanjie Tang, Xuan Ling, J.L. Stapper, Wolfgang Kunther, Qingliang Yu
Long-term leaching (heavy metal ions) behavior of municipal solid waste incineration bottom ash (MSWI BA) is one of the issues limiting its application in alkali activated materials (AAMs). This study investigates NaAlO activated slag (partially replaced by MSWI BA) in terms of the reaction process and leaching behavior. A combined approach of experimental observation and thermodynamic modeling is
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Probabilistic deep learning prediction of natural carbonation of low-carbon concrete incorporating SCMs Cement Concrete Comp. (IF 10.8) Pub Date : 2024-06-14 Afshin Marani, Timileyin Oyinkanola, Daman K. Panesar
This study develops a probabilistic neural network (PNN) based on 2165 laboratory data incorporating mixture constituents and environmental conditions parameters to estimate the natural carbonation depth of concrete. The high prediction accuracy and certainty level of the model, achieving a testing R of 0.95 and negative log-likelihood of 1.82, enabled performing numerical simulations of carbonation
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Electromechanical response of smart ultra-high-performance concrete beams under flexure: Effects of filler type and electrode spacing Cement Concrete Comp. (IF 10.8) Pub Date : 2024-06-13 Thanh Tu Lai, Min Kyoung Kim, Van Doan Truong, Tae Uk Kim, Dong Joo Kim
This study assessed the electrical resistance of smart ultra-high-performance concrete types (S–UHPCs) in the compressive and tensile zones of the flexural specimens subjected to four-point bending tests. The investigated S–UHPCs included a normal ultra-high-performance concrete (UHPC) (M1) integrated with fine steel slag aggregates (FSSAs) (M2) and a UHPC composed of multiwall carbon nanotubes and
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Preparation of reactive seedings by in-situ precarbonation under power ultrasound-assisted mixing: Enhancing the hydration and mechanical properties of OPC Cement Concrete Comp. (IF 10.8) Pub Date : 2024-06-13 Guangqi Xiong, Shuangshuang Liu, Guangzhao Yang, Shipeng Zhang, Chong Wang, Chi-sun Poon
In this study, a precarbonation process of cement paste was developed using a power ultrasound-assisted mixing method to prepare a highly reactive seedings admixture, which was subsequently added to the remaining cement paste for secondary mixing. The results revealed that power ultrasound greatly facilitated the release of ions from the cement into the pore solution, promoting the formation of calcium
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Properties of CO2-cured cement incorporating fly ash and slag subjected to further water curing Cement Concrete Comp. (IF 10.8) Pub Date : 2024-06-12 Pingping He, Sarra Drissi, Xiang Hu, Jianhui Liu, Caijun Shi
In the present work, the synergetic effect of fly ash (FA) and ground granulated blast furnace slag (GGBS) on the compressive strength and microstructure development of mortars subjected to CO curing coupled with further water curing was investigated. The calcite content in pure cement was first increased and then decreased, while it decreased gradually in cement incorporating FA and GGBS during further
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The impact of seawater ions on urea decomposition and calcium carbonate precipitation in the MICP process Cement Concrete Comp. (IF 10.8) Pub Date : 2024-06-12 Qi Fan, Liang Fan, Wai-Meng Quach, Jizhou Duan
As an environmentally friendly biotechnology, the microbial induced calcium carbonate precipitation (MICP) provides a new approach to repair concrete cracks. Most existing studies focused on finding a suitable environment for bacteria to induce as much calcium carbonate as possible, but the effect of actual concrete service environment on the repair of concrete cracks was usually ignored. This work
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Effects of cellulose nanofibrils on rheological and mechanical properties of 3D printable cement composites Cement Concrete Comp. (IF 10.8) Pub Date : 2024-06-12 Ugur Kilic, Nancy Soliman, Ahmed Omran, Osman E. Ozbulut
This study explores the effects of cellulose nanofibrils (CNF), a relatively new type of nanocellulose material, on the rheological and printability characteristics of cementitious mixtures, and the mechanical properties of 3D printed specimens. The rheology of the mortar mixtures with varying ratios of CNF is thoroughly assessed first. Two testing protocols, stress growth test and ramp test, are followed
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Degradation of flexural bond of CFRP bar in UHPFRC after exposure to elevated temperature Cement Concrete Comp. (IF 10.8) Pub Date : 2024-06-11 Sun-Jae Yoo, Oh-Seong Lee, Jean-Luc Malan Parr, Young-Soo Yoon
This paper investigated degradation of flexural bond of a ribbed carbon fiber reinforced polymer (CFRP) bar in ultra-high-performance fiber reinforced concrete (UHPFRC) after exposure to elevated temperatures. For this purpose, the mechanical properties of UHPFRC and thermal properties of CFRP bars after exposure to elevated temperatures were investigated, and a total of 16 groups of hinged beams were
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MOFs structure-inspired mesoporous composites to reinforce cementitious materials as internal curing agents Cement Concrete Comp. (IF 10.8) Pub Date : 2024-06-10 Han Wang, Yanchun Miao, Zhiyong Liu, Yali Li, Junlin Lin, Jinyang Jiang, Zeyu Lu
Drawing inspiration from the design of Metal-Organic Frameworks (MOFs), this study developed Calcium Silicate Hydrate (C–S–H) gels-Organic Frameworks (COFs), as a novel internal curing agent for cement-based materials, through coordination bond self-assembly reaction. Compared with conventional superabsorbent polymers (SAP), the developed COFs were endowed with equivalent autogenous shrinkage mitigation
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Carbonation of photocatalytic aluminosilicate cement composites: Evolution of self-cleaning and radiative cooling properties Cement Concrete Comp. (IF 10.8) Pub Date : 2024-06-10 Daoru Liu, J.C.O. Zepper, Yuxuan Chen, Lulu Cheng, Qingliang Yu
This study aims to understand the impact of carbonation on the photocatalytic self-cleaning and radiative cooling properties of autoclaved cement composites. The composites are prepared with varying silica contents and sources, with and without alumina addition under autoclave conditions. The phase composition, microstructure, optical properties, and photocatalytic self-cleaning performance are systematically
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Development of inorganic anticorrosive coatings for steel bars: Corrosion resistance testing and design Cement Concrete Comp. (IF 10.8) Pub Date : 2024-06-08 Yingwu Zhou, Ying Yu, Wenhui Guo, Feng Xing, Menghuan Guo
A densely structured three-dimensional geopolymer network could effectively impede the migration and diffusion of chloride ion. This study developed one kind of efficient and cost-effective and multi-component geopolymer coating (MGC) for inhibiting and delaying the corrosion of steel. The influence of alkali content, metakaolin replacement ratio, polyvinyl alcohol content, and titanium dioxide content
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An innovative strategy for maximizing CO2 reduction in concrete through preparing carbon sequestration precursors by accelerated carbonation Cement Concrete Comp. (IF 10.8) Pub Date : 2024-06-06 Yingliang Zhao, Kai Cui, Jionghuang He, Yong Zheng, Peiliang Shen, Chi Sun Poon, Guangmin Peng, Ruilai Guo, Daohui Xia
Concrete possesses significant potential as a medium for CO sequestration. Nevertheless, conventional approaches like CO mixing and carbonation curing have shown limited efficacy in this regard. The present work introduces a groundbreaking method for enhancing CO reduction in concrete production. It involves preparing carbon sequestration precursors (CSP) through carbonation of cement reinforced by
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Variation of microbial self-healing performance of cementitious composites with their biogranule content Cement Concrete Comp. (IF 10.8) Pub Date : 2024-06-04 Merve Sönmez Tugluca, Yusuf Çagatay Erşan, Mustafa Şahmaran
Existing studies on microbial self-healing concrete often employed an arbitrary approach to the initial amount of healing agents, leading to significant performance variations. The amount of bacteria becomes a crucial parameter affecting the overall cost of the material. Therefore, assessing the effect of initial bacteria content on microbial self-healing performances is essential. This study presents
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Electrochemical impedance spectroscopy: Effects of stray current and sulfate exposure on rubber powder mortar Cement Concrete Comp. (IF 10.8) Pub Date : 2024-06-03 Gaonian Li, Baomin Wang, Daman K. Panesar, Qiao Chen
Stray current induced by the subway power supply system can significantly accelerate the external sulfate attack of cement-based materials, leading to severe degradation. In this work, two rubber powders with different particle sizes were used to improve the performance of cement-based materials against the detrimental effects of stray current and sulfate. The electrochemical impedance spectroscopy
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Superior performance foamed concrete fabricated with amphiphilic and hydrophilic particles stabilized ultra-stable foam Cement Concrete Comp. (IF 10.8) Pub Date : 2024-06-02 Xiaoqiang Qi, Yunfeng Bao, Wenrui Wang, Sulei Zhang, Yulin Wu, Zhiqing Jia, Siyao Guo
Materials possessing sufficient strength, exceptional thermal insulation, and energy-efficient characteristics are in short supply within the construction industry. Foamed concrete, known for its cost-effectiveness, ultralight composition, and prominent thermal insulation characteristics, has displayed significant potential in applications geared towards enhancing energy efficiency. Nevertheless, its
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External magnesium sulfate attack on hydrated Portland-limestone cements: Effect of the concurrent presence of sodium chloride in the corrosive environment and metakaolin admixture in the binder Cement Concrete Comp. (IF 10.8) Pub Date : 2024-06-02 Konstantinos Sotiriadis, Anton S. Mazur, Peter M. Tolstoy, Petra Mácová, Alberto Viani
Magnesium sulfate attack on Portland-limestone cement pastes at low temperature was investigated considering the concurrent presence of sodium chloride in the corrosive solution. The common deterioration mechanism, involving leaching of portlandite and C─(A─)S─H phase and formation of crystalline phases and amorphous cross-linked aluminosilicate structures, was mitigated in the pastes made from ordinary
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Assessment of determination methods for time-zero of autogenous shrinkage in cement mortars Cement Concrete Comp. (IF 10.8) Pub Date : 2024-05-31 Hao Wang, Yuanpeng Liu, Zhangli Hu, Zihao Liu, Disheng Xu, Jiaping Liu
Determination of time-zero is crucial for standardizing autogenous shrinkage measurement, data processing and cracking risk calculation for cementitious materials. The main objective of this study is to assess mainstream methods of time-zero determination and to provide recommendations based on the underlying mechanism and data reliability. In total, nine kinds of determination methods for time-zero
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Long-term investigation of alkali-silica reaction behaviors in seawater sea-sand concrete Cement Concrete Comp. (IF 10.8) Pub Date : 2024-05-29 Yangyang Zhang, Xiaodong Xu, Qingxin Zhao, Jun Chang, Siqi Ding, Xiaozhou Liu, Chi Sun Poon
The potential sustainability and cost-effectiveness of seawater sea-sand concrete (SWSSC) have sparked widespread research interest and prompted extensive applied studies. However, the understanding of the alkali-silica reaction (ASR) in SWSSC is still lacking. In this work, the long-term ASR of SWSSC and the characterization of ASR gel was investigated. The result illustrated that the specimens mixed
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Effects of amount and geometrical properties of steel fiber on shear behavior of high-strength concrete beams without shear reinforcement Cement Concrete Comp. (IF 10.8) Pub Date : 2024-05-29 Doo-Yeol Yoo, Salman Soleimani-Dashtaki, Taekgeun Oh, Booki Chun, Jin-Seok Choi, Nemkumar Banthia, Young-Soo Yoon
This study aims to investigate the effects of the geometrical properties and volume content of steel fibers on the shear resistance of reinforced high-strength concrete (HSC) beams without stirrups. Hooked-end and twisted steel fibers with different aspect ratios ranging from 60 to 100 were used at volume fractions of 0.5%–1.0%. The shear strength of HSC beams without stirrups significantly increased
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Effect of temperature on gamma radiation shielding capabilities of bauxite-based refractory concrete Cement Concrete Comp. (IF 10.8) Pub Date : 2024-05-28 Dominika Madej, Palina Cherkes, Michał Silarski
This work presents experimental and theoretical studies on gamma-ray shielding capabilities of bauxite-containing refractory concretes containing new types of inorganic cements belonging to the CaO-AlO (as a reference), CaO-BaO-AlO-ZrO and CaO-AlO-FeO-ZrO systems. Firstly, the structure, microstructure, hydration behavior of cements, and thermal stability analysis of hydration products were investigated
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Printability region for 3D-printable engineered cementitious composites (3DP-ECC) Cement Concrete Comp. (IF 10.8) Pub Date : 2024-05-27 Wenguang Chen, Junhong Ye, Fangming Jiang, Roman Fediuk, Jiangtao Yu, Victor C. Li, Kequan Yu
The integration of reinforcement in 3D concrete printing (3DCP) presents a major challenge in current 3DCP industry. Engineered cementitious composites (ECC) with self-reinforcing characteristic provides a promising solution. However, the conflicting requirements between extrudability and buildability are amplified for 3D-printable ECC (3DP-ECC) due to the existence of a large-amount of fibers. This
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Effect of internal moisture on the electric conductivity of cement composites with expanded graphite determined by impedance spectroscopy Cement Concrete Comp. (IF 10.8) Pub Date : 2024-05-26 Maksymilian Frąc, Paulina Szołdra, Egemen Teomete, Waldemar Pichór
The paper presents the results of a study of the effect of internal moisture on the electrical conductivity of cement composites with expanded graphite. Cement pastes with different content of expanded graphite were prepared for measurement. The electrical conductivity was determined by using impedance spectroscopy at different degrees of water saturation. The results of the impedance spectroscopy
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Effect of absorption kinetics of superabsorbent polymers on printability and interlayer bond of 3D printing concrete Cement Concrete Comp. (IF 10.8) Pub Date : 2024-05-25 Yu-cun Gu, Shuyi Zheng, Hongyan Ma, Wu-Jian Long, Kamal H. Khayat
This study examines the effect of the material characteristics of superabsorbent polymers (SAPs) on the printability and interlayer bond strength of 3D printing concrete. Three types of SAP, including two acrylamide-co-acrylic polymers with coarse and fine particle sizes (S1 and S2) and an acrylic copolymer (S3), were employed. The investigated mortar mixtures had a fixed initial mini-slump flow of
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Dispersion behavior of silica fume in cementitious suspensions Cement Concrete Comp. (IF 10.8) Pub Date : 2024-05-24 Yizhong Mao, Dengwu Jiao, Xiang Hu, Zhen Jiang, Caijun Shi
The dispersion characteristics of silica fume are pivotal factors influencing the rheological properties, mechanical properties, and durability of cement-based materials. This study investigated the dispersion behavior of different types of silica fume including highly densified silica fume (HDSF), moderately densified silica fume (MDSF), and raw silica fume (RSF) in water and cement paste filtrate
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Design of a hydrophobic nano-SiO2-modified ER@EC microcapsule: Improving rheology, regulating hydration while preserving self-healing in cementitious materials Cement Concrete Comp. (IF 10.8) Pub Date : 2024-05-23 Zijian Song, Zilang Huang, Zijian Jia, Linhua Jiang, Hongqiang Chu, Yunsheng Zhang
Microcapsule-based self-healing concrete chronically suffers from rheology deterioration and hydration stagnation due to the hydrophilic and hygroscopic nature of microcapsules, limiting its efficacy and broader application. To address these issues, a novel hydrophobic nano-SiO-modified epoxy resin (ER)@ethyl cellulose (EC) microcapsule was developed and characterized. Examinations revealed that both
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Optimizing atmospheric-pressure plasma-mediated nano-silica deposition for carbon roving/UHPC interfacial bond Cement Concrete Comp. (IF 10.8) Pub Date : 2024-05-23 Hyun-Soo Youm, Sung-Gul Hong
This study aims to explore and optimize the design space of atmospheric-pressure plasma (APP) to improve nano-silica (NS) deposition onto carbon rovings and its bond compatibility with ultra-high-performance concrete (UHPC). APP treatment primarily led to surface functionalization and sizing removal without significantly modifying the surface microstructure and bulk material properties of the carbon
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Influence of sodium periodate-accelerated polydopamine modification of polyethylene fibers on fiber-matrix bonding in cementitious composites Cement Concrete Comp. (IF 10.8) Pub Date : 2024-05-21 Ali Bashiri Rezaie, Marco Liebscher, Milad Mohammadi, Astrid Drechsler, Ralf Frenzel, Alla Synytska, Viktor Mechtcherine
Surface functionalization of polyethylene (PE) fibers with polydopamine (PDA) enhances the interfacial performance between fibers and cementitious matrices, influencing the efficiency of fiber reinforcements in cementitious composites. However, typical PDA modification requires a long treatment duration which is a major hurdle for practical applications. This paper introduces a facile strategy to rapidly
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Sensing mechanisms of nanomodified Portland cement composites Cement Concrete Comp. (IF 10.8) Pub Date : 2024-05-21 Thanyarat Buasiri, Karin Habermehl-Cwirzen, Lukasz Krzeminski, Andrzej Cwirzen
Mortar sensors were fabricated as beams incorporating different amounts of carbon nanofibers (CNFs) synthesized in-situ on cement particles. Changes in electrical resistivity were measured and compared to recorded changes in compressive stress, temperature, and humidity. Sensing mechanisms and corresponding models were developed. The findings of the study indicate that the piezoresistive effect is
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Novel activation method of waste concrete powder for sustainable clinker-free binder Cement Concrete Comp. (IF 10.8) Pub Date : 2024-05-21 Aidarus Yonis, Yanchen Oinam, Prabhat Vashistha, Aron Berhanu Degefa, Geta Bekalu Belayneh, Solmoi Park, Sukhoon Pyo
This study investigates the environmental and mechanical implications of incorporating silica fume into lime-activated thermo-mechanically treated waste concrete powder (TMWCP) to develop a sustainable clinker-free binder. The novel activation method involves thermo-mechanical treatment of WCP, followed by lime and calcium formate chemical activation. The results demonstrated that incorporating silica
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Effect of organic phosphonate types on performance of alkali-activated slag-based materials and its mechanism Cement Concrete Comp. (IF 10.8) Pub Date : 2024-05-20 Jingjie Wei, Changle Fang, Bo Zhou, Zhuorui Wu
The strong early hydration reaction and short setting time of alkali-activated slag composites limit its practical engineering application. Compared with traditional chemical admixture, organic phosphates show higher efficiency in delaying the hydration rate of alkali-activated slag system. However, there is limited research on the performance of alkali-activated materials modified by different organic
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Novel treatment method of coal bottom ash for strain-hardening alkali-activated composite Cement Concrete Comp. (IF 10.8) Pub Date : 2024-05-19 Min-Chang Kang, Suhawn Ju, Taekgeun Oh, Doo-Yeol Yoo, Sukhoon Pyo
This study explored the viability of using coal bottom ash (CBA), treated as a silicate source for preparing activators, as a filler in strain-hardening alkali-activated composites. The silica content provided by CBA was approximately 30% of that provided by silica fume, and its surface morphology exhibited a rough texture after treatment. The incorporation of CBA led to an improved compressive strength
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Unveiling the impact of graphene oxide on bacteria-based autonomous healing of cracks in cementitious composites Cement Concrete Comp. (IF 10.8) Pub Date : 2024-05-17 Jianhang Feng, Radhiah Elyssa Binte Rohaizat, Shunzhi Qian
High pH in cracks depresses activities of bacteria even after they are protected well in cement-based materials, thereby restricting bacteria-based autonomous healing. To resolve this problem, graphene oxide was added to hydrogels encapsulating endospores for self-healing cementitious composites. Due to the graphene oxide incorporation, breakage ratios of hydrogels upon cracking were increased thus
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Flexural failure of ultra-high performance concrete subjected to the alternating cryogenic and elevated temperature via acoustic emission characterization Cement Concrete Comp. (IF 10.8) Pub Date : 2024-05-17 Bei He, Xinping Zhu, Hongen Zhang, Qiaomu Zheng, Hongduo Zhao, Obinna Onuaguluchi, Nemkumar Banthia, Zhengwu Jiang
This paper aims to reveal the mechanical evolution and potential mechanism of Ultra-high Performance Concrete (UHPC) exposed to a complex temperature-variation environment typical of Liquefied Natural Gas storage tank. Herein, the effect of steel fiber geometries (straight and hooked-end) on flexural failure of UHPCs in the range of −170 °C ∼ 200 °C was studied, and dynamic fracture evolution during
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Selection of suitable cellulose nanofibers derived from eco-friendly sources for the production of lightweight cementitious composites with tuned rheological, mechanical, and microstructure properties Cement Concrete Comp. (IF 10.8) Pub Date : 2024-05-16 Hesam Taheri, Nadia Ahmadi Heidari, Arnaud Perrot, Gilberto Siqueira, Gustav Nyström, Shiho Kawashima
Different cellulose nanofibers (CNF) and ordinary Portland cement (OPC) were combined to prepare CNF-OPC composite pastes at different water to cement ratios (W/C) to optimize density, thermal conductivity, and mechanical strength. The rheological data of CNF-OPC composites showed that the viscosity and yield stress of the mixtures were abruptly increased in comparison to those of OPC pastes at equal
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An efficient method for determining the pozzolanic reaction degrees of low-calcium supplementary cementitious materials in blended cement pastes Cement Concrete Comp. (IF 10.8) Pub Date : 2024-05-15 Tiao Wang, Satya Medepalli, Yuqian Zheng, Sreejith Krishnan, Ning Li, Tetsuya Ishida, Zuhua Zhang, Shashank Bishnoi, Kun Zhang
The pozzolanic reaction degree of supplementary cementitious materials (SCMs) is a crucial parameter influencing the performance of SCM-blended concrete. Although several methods, such as partial-or-no-known-crystal-structure (PONKCS) analysis with X-ray diffraction (XRD) testing and image analysis, have been developed to estimate the pozzolanic reaction degree of SCMs, they have their own challenges
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Strong piezoresistivity and piezopermittivity of cement-based material without functional admixture and their correlation Cement Concrete Comp. (IF 10.8) Pub Date : 2024-05-14 Min Kyoung Kim, Mohammad A. Al-Qaralleh, D.D.L. Chung
The strong piezoresistivity and piezopermittivity inherent in cement paste without functional admixture are evaluated and unprecedentedly correlated, with relevance to resistance-based and capacitance-based structural self-sensing, respectively. Compression (low elastic regime) decreases the resistivity and increases the permittivity, indicating respectively positive piezoresistivity (unprecedentedly
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Entrained air and freeze-thaw durability of concrete incorporating nano-fibrillated cellulose (NFC) Cement Concrete Comp. (IF 10.8) Pub Date : 2024-05-13 Obinna Onuaguluchi, Nemkumar Banthia
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Preparation and properties of carbon dioxide foamed concrete using nanoparticles as foam stabilizer and pre–carbonated cement slurry Cement Concrete Comp. (IF 10.8) Pub Date : 2024-05-11 Linbo Jiang, Zhi Wang, Yuan Wang, Jinghang Niu, Jihui Qin
The stability of carbon dioxide (CO) foam is critical for preparation and performance of CO foamed concrete (CFC). This study evaluated the effectiveness of nanoparticles for stabilizing CO foam and pre–carbonation of cement slurry for mitigating CO foam loss during CFC preparation, and conducted a comparative study of CO foam, pre-carbonized slurry and CFC, aiming at preparing CFC with excellent performance
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Rheology modification of flowable mortar with CO2 Cement Concrete Comp. (IF 10.8) Pub Date : 2024-05-10 Sean Monkman, Soo Duck Hwang, Kamal Khayat
The rheological properties of mortar samples with different additions of CO during mixing were determined. Flowable cement-based mortars at three different w/c (0.55, 0.45 and 0.35) were produced and the effects of CO gas were examined on the fresh properties of slump flow, yield stress and plastic viscosity. According to the experimental results, the mortar yield stress and plastic viscosity increased
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Assessing sampling interval-dependent roughness in fractured steel fiber reinforced concrete using a double-exponential decay model Cement Concrete Comp. (IF 10.8) Pub Date : 2024-05-09 Sailong Hou, Kai Li, Xiang Hu, Caijun Shi
This study introduces a double-exponential decay (DED) model to investigate the sampling interval ()-dependent behavior of crack morphology roughness in steel fiber reinforced concrete (SFRC). The root mean square () of the directional derivatives in 3D digital morphology is employed to quantify the roughness and its anisotropic behavior. Surface morphologies of 24 fractured specimens are captured
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Anisotropic expansion behavior and crack orientation of reinforced concrete due to the alkali–silica reaction Cement Concrete Comp. (IF 10.8) Pub Date : 2024-05-08 Sara Farooq, Gentaro Aoki, Taito Miura, Yuichiro Kawabata, Hikaru Nakamura
In this study, the expansion behavior, surface and internal crack developments due to the alkali–silica reaction in two types of reinforced concrete prisms with and without stirrups are investigated. Longitudinal and transverse expansions are continuously monitored at various positions on the prism surfaces. Image analysis is employed to determine the densities of surface and internal cracks. Crack
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Bond behaviour at high temperatures between concrete and CFRP or steel strengthening bars applied according to the embedded through-section (ETS) technique Cement Concrete Comp. (IF 10.8) Pub Date : 2024-05-07 Adriana S. Azevedo, João P. Firmo, João R. Correia
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Dynamic response of ultra-high performance engineered cementitious composites (UHP-ECC) under low-velocity impact: Effect of waste rubber incorporation and low temperatures Cement Concrete Comp. (IF 10.8) Pub Date : 2024-05-07 Binrong Zhu, Yang Wei, Hongyan Chu, Huzi Ye, Jingming Cai, Jinlong Pan
This study aims to explore the dynamic response of ultra-high performance engineered cementitious composites (UHP-ECC) incorporating waste crumb rubber (CR) at various temperatures, focusing on its potential to enhance the resilience and sustainability of civil infrastructures against low-velocity impacts. To date, the impact behaviour of UHP-ECC under low temperatures has rarely been explored. Firstly
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Internal curing of fine coral aggregate in cement mortars with low water-to-cement ratio: Difference in freshwater and seawater Cement Concrete Comp. (IF 10.8) Pub Date : 2024-05-07 Weiwei Su, Jianhui Liu, Leping Liu, Zheng Chen, Shichong Zhang, Hang Ruan, Wuwei Yang, Caijun Shi
Fine coral aggregate has a porous structure and high water absorption, which can be used as an internal curing medium. In this study, the pore characteristics and water absorption-desorption of fine coral aggregate were investigated, as well as the difference in internal curing of fine coral aggregate between freshwater and seawater mixed cement mortars with a low water-to-cement ratio. The results
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Investigation of corrosion-induced cracks using corrosion products quantified by an X-ray technique and FE analysis of single- and multiple-rebar beams Cement Concrete Comp. (IF 10.8) Pub Date : 2024-05-06 Zhejun Xu, Mitsuyoshi Akiyama, Sopokhem Lim, Supasit Srivaranun, Dan M. Frangopol, Shinichi Miyazato, Ao Li
The effects of corrosion methods, galvanostatic (GS) vs. artificial climate environment (ACE), on the relationships between corrosion products and corrosion cracks of corroded reinforced concrete beams are investigated. The experimental results show that the GS method induces smaller corrosion crack width. A novel quantitative detection method of corrosion product thickness using X-ray and digital
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Improving the air bubble stability of air-entrained mortar in low air pressure environments via adopted rheology and surface tension methods Cement Concrete Comp. (IF 10.8) Pub Date : 2024-05-06 Zonglin Xie, Shenghao Zuo, Lei Chen, Fuwen Zhong, Yi Tian, Qiang Yuan
Air bubble stability in cementitious materials in low air pressure (AP) environments is influenced by the Ostwald ripening process, which causes coarsening behavior of air bubbles. This research reports the enhancement of air bubble stability in low AP via the adoption of rheology and surface tension methods. Besides, the evolution of air bubbles during the cement early hydration process is proposed
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Preparation and formation mechanism of high-toughness organic polymers modified geopolymers Cement Concrete Comp. (IF 10.8) Pub Date : 2024-05-06 Xiaotong Xing, Beihan Wang, Shunjie Luo, Fazhuo Lin, Jiangxiong Wei, Weiting Xu, Jie Hu, Qijun Yu
In recent years, geopolymers have shown potential to replace ordinary cement materials due to their simple preparation, low cost, and excellent performance. Adding organics to geopolymers can enhance toughness and broaden their application potential as building materials. However, the effect of common molding processes to enhance the toughness of organic polymers modified geopolymers remains very limited
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Role of atmospheric-pressure plasma in SiO2 particle deposition onto carbon rovings for improved bond with concrete matrix Cement Concrete Comp. (IF 10.8) Pub Date : 2024-05-06 Hyun-Soo Youm, Sung-Gul Hong
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Ultra-stable foam enabled by nano silica engineering for foam concrete improvement Cement Concrete Comp. (IF 10.8) Pub Date : 2024-05-05 Chunpeng Zhang, Dingqiang Fan, Jian-Xin Lu, Chaoming Pang, Chi Sun Poon
Foam concrete is increasingly applied in construction due to its lightweight, good thermal insulation and fire resistance, and environmental sustainability, while its low strength limits its further popularization and applications. To enhance the stability and performance of foam concrete, amphiphilic nano silica (ANS) was employed in this study to modify the sodium dodecyl sulphate (SDS) based foaming
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Tensile behavior of rebar-reinforced coarse aggregate ultra-high performance concrete (R-CA-UHPC) members: Experiments and restrained shrinkage creep effect Cement Concrete Comp. (IF 10.8) Pub Date : 2024-05-04 Zhanchong Shi, Minfei Liang, Qingtian Su, Terje Kanstad, Liberato Ferrara
Rebar-reinforced coarse aggregate ultra-high-performance concrete (R-CA-UHPC) has been used in the construction of new structures and strengthening of deteriorated aged infrastructures, and it inevitably sustains tension. To study the tensile behavior of R-CA-UHPC members, axial tensile tests for dog-bone-shaped specimens were designed and conducted. The investigated variables included reinforcement
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Mechanical properties of polymer modified mortars using polymer latexes with varied glass transition temperature and surface charges Cement Concrete Comp. (IF 10.8) Pub Date : 2024-05-03 Chaoyang Zhang, Jian Liu, Shangfeng Zhang, Xiangming Kong
Mechanical properties of polymer modified mortar (PMM) were investigated using self-synthesized polymer latexes with varied glass transition temperature (T) and colloidal surface charges to build correlations between the mechanical properties of PMMs and the intrinsic properties of the polymers. Generally, compressive strength and elastic modulus of mortar are decreased, but ductility and toughness
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Mitigating autogenous shrinkage of cement with carbon nanotube sponge Cement Concrete Comp. (IF 10.8) Pub Date : 2024-05-01 Xinming Wang, Jing Zhong
Autogenous shrinkage can be mitigated by the addition of superabsorbent polymer (SAP), however, typically at the cost of a significant strength loss. To overcome such dilemma, hydrophilic carbon nanotube sponge (H-CNTSP) was proposed in this study as a novel internal curing agent. Due to the high porosity and enriched hydrophilic functional groups, H-CNTSP can absorb pore solution at 72 g/g driven
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Mechanism of fineness and content of quartz powder on the improvement of carbonation curing efficiency Cement Concrete Comp. (IF 10.8) Pub Date : 2024-05-01 Mei-Yu Xuan, Rongxin Guo, Run-Sheng Lin, Xiaolu Wang, Xiao-Yong Wang
Quartz powder is a byproduct of quartzite processing. To date, research on the use of quartz powder in carbonation curing is extremely limited, and the carbonation curing mechanism of concrete containing quartz powder is still unclear. In this study, we focused on the effects of fineness and content of the quartz powder on carbonation curing for cement-quartz powder binary mixtures and compared the
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Experimental verification of innovative spatial reinforcement of ultra-high performance concrete with mesh tubes Cement Concrete Comp. (IF 10.8) Pub Date : 2024-04-29 Anna Szcześniak, Adam Stolarski