约束条件下碱-硅反应损伤混凝土裂缝取向扩展各向异性的估计

IF 8 1区工程技术 Q1 CONSTRUCTION & BUILDING TECHNOLOGY

Construction and Building Materials Pub Date : 2025-06-12 DOI:10.1016/j.conbuildmat.2025.142145

Sara Farooq , Taito Miura , Hikaru Nakamura

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引用次数: 0

摘要

本研究旨在探讨在钢筋约束条件下碱-硅反应（ASR）引起混凝土膨胀和开裂的各向异性。在受asr影响的混凝土中，膨胀沿着受约束的方向被抑制，并重新定向到受约束较少的方向，这种现象被称为膨胀转移。采用钢筋嵌固混凝土柱分析了这一现象，探讨了混凝土与钢筋之间的粘结对裂缝分布和方向的影响。研究结果表明，裂缝沿约束最小的方向排列，在钢筋存在的情况下表现出独特的方向。内部裂纹分布可以用表面裂纹图来估计。此外，还提出了裂纹方向性指数，定义为横向与纵向裂纹密度之比，以量化扩展的各向异性。

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Estimation of anisotropy of expansion from crack orientation in concrete damaged by alkali–silica reaction under constraint conditions

This study is aimed at exploring the anisotropy of expansion and cracking in concrete induced by alkali–silica Reaction (ASR) under constraint conditions imposed by rebars. In ASR-affected concrete, expansion is suppressed along constrained directions and redirected to less constrained directions, a phenomenon known as expansion transfer. This phenomenon is analyzed using concrete prisms embedded with rebars to investigate the influence of the bond between concrete and the rebar on crack distribution and orientation. The findings reveal that cracks align with the direction of least restraint, exhibiting distinctive orientations in the presence of rebars. The internal crack distribution can be estimated using surface crack patterns. Furthermore, a crack directionality index, defined as the ratio of transverse to longitudinal crack densities, is proposed to quantify the anisotropy of expansion.

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来源期刊

Construction and Building Materials 工程技术-材料科学：综合

CiteScore

13.80

自引率

21.60%

发文量

3632

审稿时长

82 days

期刊介绍： Construction and Building Materials offers an international platform for sharing innovative and original research and development in the realm of construction and building materials, along with their practical applications in new projects and repair practices. The journal publishes a diverse array of pioneering research and application papers, detailing laboratory investigations and, to a limited extent, numerical analyses or reports on full-scale projects. Multi-part papers are discouraged. Additionally, Construction and Building Materials features comprehensive case studies and insightful review articles that contribute to new insights in the field. Our focus is on papers related to construction materials, excluding those on structural engineering, geotechnics, and unbound highway layers. Covered materials and technologies encompass cement, concrete reinforcement, bricks and mortars, additives, corrosion technology, ceramics, timber, steel, polymers, glass fibers, recycled materials, bamboo, rammed earth, non-conventional building materials, bituminous materials, and applications in railway materials.