Effect of the interactions between crystal and gel hydration products on the volume change of cementitious materials

IF 10.8 1区工程技术 Q1 CONSTRUCTION & BUILDING TECHNOLOGY

Cement & concrete composites Pub Date : 2024-09-18 DOI:10.1016/j.cemconcomp.2024.105764

Depeng Zhang , Hui Li , Zhenyu Pi , Mingfeng Xu , Jian Zhou , Mingzhong Zhang

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引用次数: 0

Abstract

The volume change of cementitious materials is often studied based on the properties of the individual hydration product, either from the gel products causing shrinkage or the crystal products causing expansion. Previous studies of the team have theoretically revealed that the interactions between crystal and gel products produce the “micro self-stressing”, which affects the volume change of cementitious materials. This work presents theoretical and experimental studies into the impact of the interactions between crystal and gel products on the volume change of cementitious materials. Firstly, a theoretical model for the volume change of cementitious materials was proposed. Secondly, in the followed experiment, the crystallization pressure, which affects the interactions between crystal and gel products, was tailored by immersing specimens in different exchange solvents or solutions to change the solubility product. Water, isopropyl alcohol, ethanol, calcium hydroxide and calcium acetate were selected as the exchange solvents or solutions. Subsequently, cement pastes were vacuum dried. Volume changes of cement pastes were tested during the whole process. Inductively-coupled plasma mass spectrometry and ion chromatography were utilized to test the ion concentrations and calculate the crystallization pressure. Finally, the experimental results were compared with the calculated results to validate the model. Results indicated that cement pastes immersed in different solvents or solutions exhibited different volume changes. An increase in crystallization pressure by 45.3 % resulted in a 46.1 % increase in the expansion of cement paste. Moreover, the reduction in the interactions should be one of the factors contributing to the drying shrinkage of cement paste.

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晶体和凝胶水化产物之间的相互作用对胶凝材料体积变化的影响

对胶凝材料体积变化的研究通常基于单个水化产物的特性，即凝胶产物导致收缩或晶体产物导致膨胀。该团队之前的研究从理论上揭示了晶体和凝胶产物之间的相互作用会产生 "微自应力"，从而影响胶凝材料的体积变化。本研究对晶体和凝胶产物之间的相互作用对胶凝材料体积变化的影响进行了理论和实验研究。首先，提出了胶凝材料体积变化的理论模型。其次，在随后的实验中，通过将试样浸入不同的交换溶剂或溶液中来改变溶度积，从而调整影响晶体和凝胶产物之间相互作用的结晶压力。水、异丙醇、乙醇、氢氧化钙和醋酸钙被选为交换溶剂或溶液。随后，对水泥浆进行真空干燥。在整个过程中测试水泥浆的体积变化。利用电感耦合等离子体质谱法和离子色谱法检测离子浓度并计算结晶压力。最后，将实验结果与计算结果进行比较，以验证模型。结果表明，浸入不同溶剂或溶液中的水泥浆表现出不同的体积变化。结晶压力增加 45.3% 会导致水泥浆膨胀率增加 46.1%。此外，相互作用的减少应是导致水泥浆干燥收缩的因素之一。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Cement & concrete composites 工程技术-材料科学：复合

CiteScore

18.70

自引率

11.40%

发文量

459

审稿时长

65 days

期刊介绍： Cement & concrete composites focuses on advancements in cement-concrete composite technology and the production, use, and performance of cement-based construction materials. It covers a wide range of materials, including fiber-reinforced composites, polymer composites, ferrocement, and those incorporating special aggregates or waste materials. Major themes include microstructure, material properties, testing, durability, mechanics, modeling, design, fabrication, and practical applications. The journal welcomes papers on structural behavior, field studies, repair and maintenance, serviceability, and sustainability. It aims to enhance understanding, provide a platform for unconventional materials, promote low-cost energy-saving materials, and bridge the gap between materials science, engineering, and construction. Special issues on emerging topics are also published to encourage collaboration between materials scientists, engineers, designers, and fabricators.