利用超卵状水泥颗粒水化模型研究水泥浆体的孔隙弯曲度和扩散系数

IF 6.7 2区工程技术 Q1 CONSTRUCTION & BUILDING TECHNOLOGY

Journal of building engineering Pub Date : 2024-12-24 DOI:10.1016/j.jobe.2024.111654

Mingqi Li, Longbang Qing, Huisu Chen, Jianjun Lin

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引用次数: 0

摘要

孔隙弯曲度受孔隙微观几何形状的影响，是理解水泥浆体弯曲输运路径对水泥浆体扩散系数影响的重要物理量。为研究水泥水化过程中水泥颗粒形状对孔隙弯曲度和扩散系数的影响，建立了微观结构导向模型。该模型有三个重要组成部分：(1)基于连续体的超卵状水泥颗粒水化模型，用于表征微观结构演化；(2)基于Dijkstra算法的孔隙弯曲度传输路径搜索模型；(3)获取水泥浆体扩散系数的晶格玻尔兹曼方法。结果表明：随着超卵状水泥颗粒的方度参数m的增大和参数T的减小，孔隙扭曲度增大，进一步引起扩散系数的降低；

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Insights into pore tortuosity and diffusivity of cement paste via hydration model with superovoidal cement particles

Pore tortuosity, as being influenced by the pore micro-geometry, is an important physical quantity to understand the effect of sinuous transport paths on diffusivity of cement paste. This work develops a microstructure-guided model for investigating the influence of cement particle shape on the pore tortuosity and diffusivity during cement hydration process. There are three important components of the model: (1) a continuum-based hydration model with superovoidal cement particles for characterizing microstructure evolution; (2) a Dijkstra algorithm-based transport path searching model for measuring the pore tortuosity; (3) a lattice Boltzmann method for acquiring the diffusivity of cement paste. The results indicate that the pore tortuosity increases with enlarging squareness parameter m and tapering parameter T of superovoidal cement particle, which further induces the decrease of diffusivity.

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来源期刊

Journal of building engineering Engineering-Civil and Structural Engineering

CiteScore

10.00

自引率

12.50%

发文量

1901

审稿时长

35 days

期刊介绍： The Journal of Building Engineering is an interdisciplinary journal that covers all aspects of science and technology concerned with the whole life cycle of the built environment; from the design phase through to construction, operation, performance, maintenance and its deterioration.