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High-temperature strengthening of Portland cementitious materials by surface micro-ceramization
Cement and Concrete Research ( IF 10.9 ) Pub Date : 2025-01-18 , DOI: 10.1016/j.cemconres.2025.107790
Weizheng Shi, Zixiao Wang, Chaoqun Li, Qingya Sun, Weiqiang Wang, Shuxin Deng, Weijin Li, Aming Xie

This work prepares a novel cementitious material with high-temperature strengthening by adding titanium diboride (TiB2) powders into Portland cement. The influences of TiB2 on the physicochemical properties of paste samples before and after high-temperature treatment (the maximum is 900 °C) are investigated. Results indicated that the pore structure of hardened paste is refined after curing because of the filling effects of TiB2 micron powders. During the heating, the ceramic phases are formed from the outer layer to the inner layer in the hardened paste because of the high-temperature oxidability of TiB2, strengthening the matrix significantly (the highest compressive strength value increase is about 55.2% compared to the initial value). A random forest algorithm model analyses the contributions of matrix compositions and porosity on the compressive strength of hardened paste. The potential reaction mechanisms among the TiB2 and the main hydrates at high temperatures are suggested.

中文翻译:


表面微陶瓷化对波特兰胶凝材料进行高温强化



本工作通过在波特兰水泥中加入二硼化钛 (TiB2) 粉末制备了一种具有高温强化的新型水泥基材料。研究了 TiB2 对高温处理(最高 900 °C)前后浆料样品理化性质的影响。结果表明,由于 TiB2 微米粉末的填充作用,硬化浆料的孔隙结构在固化后得到细化。在加热过程中,由于TiB2的高温氧化性,硬化浆料中从外层到内层形成陶瓷相,对基体进行了显著强化(与初始值相比,最高抗压强度值增加约55.2%)。随机森林算法模型分析基体成分和孔隙率对硬化浆料抗压强度的影响。本文提出了 TiB2 与主要水合物在高温下的潜在反应机制。
更新日期:2025-01-18
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