A study on the effects of the fractal characteristics of aggregates on the mechanical behavior of cemented sand and gravel

IF 16.4 1区化学 Q1 CHEMISTRY, MULTIDISCIPLINARY Accounts of Chemical Research Pub Date : 2021-05-27 DOI:10.3989/MC.2021.13020

L. Guo, S. Li, L. Zhong, L. Guo, L. Wang, F. Zhang, Y. Zhang, M. Wang

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引用次数: 3

Abstract

Owing to complex aspects of cemented sand and gravel (CSG), such as included unscreened aggregates, CSG properties differ from those of ordinary concrete. Fractal theory is introduced to study the effects of aggregate characteristics on CSG properties, quantifying aggregate gradation and shape. Numerical simulation and analyses show that: (1) improved aggregate gradation decreases the gradation fractal dimension and increases the CSG peak stress and elastic modulus; (2) more irregularly shaped aggregates increase the shape fractal dimension and decrease the CSG peak stress and elastic modulus; (3) the relationship quantified between aggregate characteristics and CSG mechanical properties provides a theoretical basis for aggregate allocation in engineering design and construction. Mixing artificial aggregates can improve aggregate gradation but reduces CSG performance. Appropriately blending artificial and on-site aggregates achieves optimal CSG performance; in this study, this is attained using 20% artificial aggregates added under standard gradation.

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集料分形特性对胶结砂砾力学行为影响的研究

由于胶结砂和砾石（CSG）的复杂性，如包含的未筛分骨料，CSG的性能与普通混凝土不同。引入分形理论研究了集料特性对CSG性能的影响，量化了集料的级配和形状。数值模拟和分析表明：（1）改进的集料级配降低了级配的分形维数，提高了CSG峰值应力和弹性模量；（2）不规则形状的聚集体增加了形状的分形维数，降低了CSG峰值应力和弹性模量；（3）骨料特性与CSG力学性能之间的定量关系为工程设计和施工中的骨料分配提供了理论依据。混合人工骨料可以改善骨料级配，但会降低CSG的性能。人工骨料和现场骨料的适当混合可实现最佳的CSG性能；在本研究中，这是通过在标准级配下添加20%的人工骨料来实现的。

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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.