再生骨料混凝土的中尺度建模:骨料质量和形状参数分析

IF 3 3区 工程技术 Q2 CONSTRUCTION & BUILDING TECHNOLOGY
Qifan Ren, João Pacheco, Jorge de Brito
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引用次数: 0

摘要

再生骨料混凝土(RAC)是一种多相材料,研究各相特性的影响非常有意义。然而,目前仍缺乏对这些特性的全面参数分析,这限制了对 RAC 行为的全面了解。本文采用数值中尺度模型,有助于加深对这一主题的了解。本文的重点是骨料质量和形状的影响,因为它们与混凝土的行为相关,但对 RAC 的研究却很少。本文基于一个经过验证的二维数值模型,分析了它们对 RAC 机械响应和断裂行为的影响。此外,本文还对参数范围的选择进行了论证,并将数值结果与最先进的数值结果进行了比较。本文的主要结论如下(1) 较硬的集料会降低 RAC 的抗拉强度(最多降低 29%)和抗压强度(最多降低 7%);(2) 集料形状对这些性能的影响不大,最多分别降低 10%和 8%;(3) RAC 的弹性模量受集料刚度的影响较大(15%),而几乎不受集料形状的影响;(4) 较硬的集料和细长集料都容易导致界面微裂缝和混凝土过早失效。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Mesoscale modeling of recycled aggregate concrete: A parametric analysis of the quality and shape of aggregate
Recycled aggregate concrete (RAC) is a multi‐phase material, and it is meaningful to investigate the effect of the properties of each phase. However, a comprehensive parametric analysis of these properties is still lacking, which limits a full understanding of the behavior of RAC. This paper uses numerical mesoscale models and contributes to knowledge on this topic. It focuses on the effects of the quality and shape of aggregate since they are relevant to the behavior of concrete but have scarcely been studied for RAC. Their effects on the mechanical response and fracture behavior of RAC were analyzed based on a validated two‐dimensional numerical model. In addition, this paper also justified the choice of the range of the parameters as well as benchmarked the numerical results with the state‐of‐the‐art. The main findings of the paper are: (1) stiffer aggregates decrease the tensile (by up to 29%) and compressive strength of RAC (by up to 7%); (2) aggregate shape moderately influences these properties by up to 10% and 8%; (3) the modulus of elasticity of RAC is considerably influenced by the stiffness of the aggregates (15%), while it is almost unaffected by the shape of the aggregates; (4) both stiffer and elongated aggregates tend to cause micro‐cracking in the interface and premature failure of concrete.
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来源期刊
Structural Concrete
Structural Concrete CONSTRUCTION & BUILDING TECHNOLOGY-ENGINEERING, CIVIL
CiteScore
5.60
自引率
15.60%
发文量
284
审稿时长
3 months
期刊介绍: Structural Concrete, the official journal of the fib, provides conceptual and procedural guidance in the field of concrete construction, and features peer-reviewed papers, keynote research and industry news covering all aspects of the design, construction, performance in service and demolition of concrete structures. Main topics: design, construction, performance in service, conservation (assessment, maintenance, strengthening) and demolition of concrete structures research about the behaviour of concrete structures development of design methods fib Model Code sustainability of concrete structures.
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