High-temperature strengthening of Portland cementitious materials by surface micro-ceramization

IF 10.9 1区工程技术 Q1 CONSTRUCTION & BUILDING TECHNOLOGY

Cement and Concrete Research 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

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Abstract

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.

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硅酸盐胶凝材料表面微陶化的高温强化

在硅酸盐水泥中加入二硼化钛（TiB2）粉末，制备了一种具有高温强化性能的新型胶凝材料。研究了TiB2对膏体样品高温处理（最高900℃）前后理化性能的影响。结果表明，由于TiB2微米粉的填充作用，硬化膏体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，硬化膏体中由外层向内层形成陶瓷相，基体强度显著增强（最高抗压强度值较初始值提高约55.2%）。随机森林算法模型分析了基质成分和孔隙率对硬化膏体抗压强度的影响。提出了TiB2与主要水合物在高温下的潜在反应机理。

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来源期刊

Cement and Concrete Research 工程技术-材料科学：综合

CiteScore

20.90

自引率

12.30%

发文量

318

审稿时长

53 days

期刊介绍： Cement and Concrete Research is dedicated to publishing top-notch research on the materials science and engineering of cement, cement composites, mortars, concrete, and related materials incorporating cement or other mineral binders. The journal prioritizes reporting significant findings in research on the properties and performance of cementitious materials. It also covers novel experimental techniques, the latest analytical and modeling methods, examination and diagnosis of actual cement and concrete structures, and the exploration of potential improvements in materials.