A Model for Predicting Crack Width of PVA Fiber-Reinforced Recycled Aggregate Concrete Slabs

IF 16.4 1区化学 Q1 CHEMISTRY, MULTIDISCIPLINARY

Accounts of Chemical Research Pub Date : 2024-09-09 DOI:10.1007/s12205-024-0155-z

Feng Yu, Changfeng Xie, Yuan Fang, Jie Song, Honglei Xie, Shijiang Zhang, Wenlong Song

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引用次数: 0

Abstract

The four-point loading tests of polyvinyl alcohol fiber-reinforced recycled aggregate concrete (PVAF-RRAC) slabs are conducted and the impacts of reinforcement ratio ρ_s, content of PVA fiber ρ_f, span-thickness ratio l/h and replacement ratio of recycled coarse aggregate (RCA) γ on crack formation mechanism, crack spacing and crack width are analyzed. The failure modes of recycled aggregate concrete (RAC) slabs and PVAF-RRAC slabs are distinguished by yield of longitudinal tensile reinforcement and fragmentation of concrete in compression zone. Meanwhile, the damage of PVAF-RRAC slabs is also accompanied by pull-out or broken of PVA fibers along crack gaps. In contrast, the concrete crushing phenomenon of PVAF-RRAC slabs is not distinct, indicating PVA fibers incorporation could improve flexural performance. The average spacing and maximum crack width of PVAF-RRAC slabs are relatively small, the crack distribution is more uniform. The crack development rate and crack width decrease as ρ_f or ρ_s increases while they increase as γ or l/h increases. Considering the impact of ρ_f on average crack spacing, a formula for approximately forecasting the average crack spacing of PVAF-RRAC slabs is proposed. Additionally, an influence coefficient of RCA is introduced, a prediction model for crack width in PVAF-RRAC slabs is established and test data are validated with favorable results.

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预测 PVA 纤维增强再生骨料混凝土板裂缝宽度的模型

对聚乙烯醇纤维增强再生骨料混凝土（PVAF-RRAC）板进行了四点加载试验，分析了配筋率 ρs、聚乙烯醇纤维含量 ρf、跨厚比 l/h 和再生粗骨料（RCA）替代率 γ 对裂缝形成机理、裂缝间距和裂缝宽度的影响。再生骨料混凝土（RAC）板和 PVAF-RRAC 板的破坏模式分别为纵向受拉钢筋屈服和受压区混凝土破碎。同时，PVAF-RRAC 板的损坏还伴随着 PVA 纤维沿裂缝间隙的拉出或断裂。相比之下，PVAF-RRAC 板的混凝土破碎现象并不明显，这表明 PVA 纤维的加入可以改善板的抗折性能。PVAF-RRAC 板的平均间距和最大裂缝宽度相对较小，裂缝分布较为均匀。随着 ρf 或 ρs 的增大，裂纹发展速度和裂纹宽度减小，而随着 γ 或 l/h 的增大，裂纹发展速度和裂纹宽度增大。考虑到 ρf 对平均裂缝间距的影响，提出了近似预测 PVAF-RRAC 板平均裂缝间距的公式。此外，还引入了 RCA 的影响系数，建立了 PVAF-RRAC 板裂缝宽度预测模型，并对试验数据进行了验证，结果良好。

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

Accounts of Chemical Research 化学-化学综合

CiteScore

31.40

自引率

1.10%

发文量

312

审稿时长

2 months

期刊介绍： Accounts of Chemical Research presents short, concise and critical articles offering easy-to-read overviews of basic research and applications in all areas of chemistry and biochemistry. These short reviews focus on research from the author’s own laboratory and are designed to teach the reader about a research project. In addition, Accounts of Chemical Research publishes commentaries that give an informed opinion on a current research problem. Special Issues online are devoted to a single topic of unusual activity and significance. Accounts of Chemical Research replaces the traditional article abstract with an article "Conspectus." These entries synopsize the research affording the reader a closer look at the content and significance of an article. Through this provision of a more detailed description of the article contents, the Conspectus enhances the article's discoverability by search engines and the exposure for the research.