基于氢氧化钙空间分布模型的水泥浆体ITZ最内层特性分析

IF 7.6 2区材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY

Materials & Design Pub Date : 2025-06-16 DOI:10.1016/j.matdes.2025.114249

Yuting Chu , Qijun Yu , Yang Yu , Peng Gao , Binggen Zhan

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引用次数: 0

摘要

由于实验表征和数值模拟的不足，水泥浆体和骨料之间的界面过渡区（ITZ）的最内层仍然知之甚少。本研究基于氢氧化钙（CH）在多孔介质中的晶体重分布机理，通过模拟氢氧化钙（CH）的空间分布来模拟ITZ的微观结构。模拟结果表明，由于该区域距离图值较大，CH集中在最内层附近（即距骨料2.5 ~ 5.0 μm）。然而，在最内层（即距骨料2.5 μm以内），距离图值急剧下降，从而减少了CH的沉积。结果表明，ITZ最内层的微观结构极为松散。水灰比（W/C）为0.4时，最内层（距骨料0.5 μm）孔隙率在28 d时达到76.6%。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

Characteristic analysis of innermost layer of ITZ of cement paste based on modelling the spatial distribution of calcium hydroxide

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Characteristic analysis of innermost layer of ITZ of cement paste based on modelling the spatial distribution of calcium hydroxide

The innermost layer of the interfacial transition zone (ITZ) between cement paste and aggregate has remained poorly understood due to insufficient experimental characterisation and numerical modelling. In this study, the microstructure of ITZ was simulated by modelling the spatial distribution of calcium hydroxide (CH) based on the mechanism of crystal redistribution in porous media. The modelling results showed that CH concentrated adjacent to the innermost layer (i.e. 2.5–5.0 μm from the aggregate) due to the large distance map values in this region. However, in the innermost layer ((i.e. within 2.5 μm from the aggregate), the distance map values decreased sharply, thereby reducing CH deposition. Consequently, the innermost layer of the ITZ exhibited an extremely loose microstructure. For the ITZ with the water to cement (W/C) ratio of 0.4, the innermost layer (0.5 μm from the aggregate) reached a porosity of 76.6 % at 28 days.

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来源期刊

Materials & Design Engineering-Mechanical Engineering

CiteScore

14.30

自引率

7.10%

发文量

1028

审稿时长

85 days

期刊介绍： Materials and Design is a multi-disciplinary journal that publishes original research reports, review articles, and express communications. The journal focuses on studying the structure and properties of inorganic and organic materials, advancements in synthesis, processing, characterization, and testing, the design of materials and engineering systems, and their applications in technology. It aims to bring together various aspects of materials science, engineering, physics, and chemistry. The journal explores themes ranging from materials to design and aims to reveal the connections between natural and artificial materials, as well as experiment and modeling. Manuscripts submitted to Materials and Design should contain elements of discovery and surprise, as they often contribute new insights into the architecture and function of matter.