Influence of self-healing on water permeability of cracked UHPCs with different steel fiber contents under nonlinear flow conditions

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

Cement & concrete composites Pub Date : 2024-12-09 DOI:10.1016/j.cemconcomp.2024.105888

Sailong Hou , Kai Li , Xiang Hu , Jingwei Yang , Juhyuk Moon , Caijun Shi

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引用次数: 0

Abstract

Water permeability tests (WPTs) based on Darcy's law ignore inertial effect, yielding biased assessments. This study examines self-healing effects on water resistances of cracked and healed ultra-high performance concretes (UHPCs) with varying steel fiber contents, using a nonlinear WPT based on Forchheimer's law. Permeability coefficients (κ_v and κ_i) quantify viscous and inertia energy consumptions, minimizing the inertial effects on measuring intrinsic transmittance constant parameter (α) and healing efficiency. 3D digital crack analysis determines hydraulic tortuosity (τ_H) via linear flow simulation. Results indicate that increased steel fibers enhance water resistance with higher τ_H and reduced α. Self-healing significantly reduces the transport capacity of cracked UHPCs, decreasing

κ_{v}

and altering

κ_{i}

, which affects crack flow behaviors. Inertial effects on healing efficiency are quantified. A modified Arrhenius model relates

κ_{v}

and

κ_{i}

, characterizing inertial effects. This approach offers a strategy for properly assessing water resistance and healing efficiency of cracked concrete.

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非线性流动条件下自愈对不同钢纤维掺量裂缝超高性能混凝土透水性的影响

基于达西定律的水渗透性测试忽略了惯性效应，产生了有偏差的评估。本研究采用基于Forchheimer定律的非线性WPT，研究了不同钢纤维含量的超高性能混凝土（UHPCs）的自愈对开裂和愈合的抗水性的影响。渗透系数（κv和κi）量化了粘性和惯性能量消耗，最大限度地减少了惯性对测量固有透过率常数参数（α）和愈合效率的影响。三维数字裂纹分析通过线性流动模拟确定水力弯曲度τH。结果表明：钢纤维的增加使水阻力增大，τH增大，α降低。自愈显著降低了裂缝混凝土的输运能力，降低或改变了其输运能力，影响了裂缝的流动行为。量化了惯性效应对愈合效率的影响。一个修正的阿伦尼乌斯模型描述了惯性效应。该方法为正确评估裂缝混凝土的抗水性和愈合效率提供了一种策略。

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.