水泥浆体扩散系数与孔隙结构参数的定量关系研究

IF 1.8 4区工程技术 Q3 CONSTRUCTION & BUILDING TECHNOLOGY

Magazine of Concrete Research Pub Date : 2023-05-15 DOI:10.1680/jmacr.22.00262

Liangyuan Xie, Lin Liu, Guanghui Tao

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引用次数: 0

摘要

本文研究了孔隙结构对水泥浆体氯离子扩散率的影响。建立了孔隙结构参数（即孔径、孔隙率、收缩率和弯曲度）与水泥浆体扩散率之间的定量关系。生成了不同孔结构参数的微观结构，并用三维晶格扩散率模型预测了它们的扩散率。研究发现，孔径对水泥浆体的氯离子扩散率影响不大，孔隙率、收缩率和弯曲度对氯离子扩散系数有显著影响。扩散率与孔隙率成正比，与收缩率的二阶多项式成正比，并与弯曲度的平方成反比。所提出的模型可以为提高水泥基复合材料的扩散率提供基本的理解。

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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Study on the quantitative relationship between diffusivity and pore structure parameters of cement pastes

This paper investigates the influence of pore structures on the chloride diffusivity of cement pastes. A quantitative relationship between pore structure parameters (i.e., pore diameter, porosity, constrictivity, and tortuosity) and the diffusivity of cement paste is established. Microstructures of different pore structure parameters were generated, and then their diffusivities were predicted by 3D lattice diffusivity model. It was found that the pore diameter has little effect on the chloride diffusivity of the cement pastes, and the chloride diffusivity is significantly affected by porosity, constrictivity and tortuosity. The diffusivity is proportional to the porosity, proportional to the 2nd order polynomial of the constrictivity, and inversely proportional to the square of the tortuosity. The proposed model can provide a fundamental understanding for improving the diffusivity of cement-based composite materials.

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来源期刊

Magazine of Concrete Research 工程技术-材料科学：综合

CiteScore

4.60

自引率

11.10%

发文量

102

审稿时长

5 months

期刊介绍： For concrete and other cementitious derivatives to be developed further, we need to understand the use of alternative hydraulically active materials used in combination with plain Portland Cement, sustainability and durability issues. Both fundamental and best practice issues need to be addressed. Magazine of Concrete Research covers every aspect of concrete manufacture and behaviour from performance and evaluation of constituent materials to mix design, testing, durability, structural analysis and composite construction.