Experimental and Numerical Studies on the Direct Shear Behavior of Sand-RCA (Recycled Concrete Aggregates) Mixtures with Different Contents of RCA

doi:10.3390/ma14112909

	Experimental and Numerical Studies on the Direct Shear Behavior of Sand-RCA (Recycled Concrete Aggregates) Mixtures with Different Contents of RCA
	Liu, Yiming 1; Huang, Shiqiang 1; Li, Lihua 1; Xiao, Henglin 1; Chen, Zhi 1; Mao, Haijun 2
刊名	MATERIALS
	2021-06-01
卷号	14 期号:11 页码:20
关键词	discrete element method direct shear test recycled concrete aggregates (RCA) RCA contents
DOI	10.3390/ma14112909
英文摘要	Recycled concrete aggregate (RCA) is a typical construction and demolition (C&D) material generated in civil engineering activities and has been widely used as the coarse-grained filler added to sand for roadbed fillings. The effect of RCA content on the mechanical behavior of sand-RCA mixtures is complicated and still not fully understood. To explore the effect of RCA content on the macroscale and microscopic behavior of the sand-RCA mixtures with various RCA contents, laboratory direct shear tests and numerical simulations using the 3D discrete element method were performed. Experimental direct shear tests on sand-RCA mixtures with different contents of RCA were first carried out. Numerical direct shear models were then established to represent the experimental results. The particle shape effect was also considered using a new realistic shape modeling method to model the RCA particles. Good agreement was observed between the DEM simulation and experimental results, verifying the ability of the numerical direct shear models to represent the direct shear behavior of sand-RCA mixtures. The macroscopic responses of both experimental and numerical tests showed that all samples presented an initial hardening followed by a post-peak strain softening. The peak-state friction angles increased with the RCA content for samples under the same vertical stress. The effect of RCA content on the microscopic behavior based on DEM simulation was also found. The microscopic properties of RCA-sand mixtures, such as coordination numbers, PDFs and contact force transformation features, were analyzed and related to the macroscopic results.
资助项目	National Natural Science Foundation of China[51808204] ; the Science, Technology Planning Project Wuhan[2020020601012278] ; the Innovative Group Project of Hubei Province[2020CFA046] ; PhD research startup foundation of Hubei University of Technology[BSQD2019040] ; Hubei Central Special Fund for Local Science and Technology Development[2019ZYYD053] ; Hubei Central Special Fund for Local Science and Technology Development[2018ZYYD005]
WOS研究方向	Chemistry ; Materials Science ; Metallurgy & Metallurgical Engineering ; Physics
语种	英语
出版者	MDPI
WOS记录号	WOS:000660276400001
内容类型	期刊论文
源URL	[http://119.78.100.198/handle/2S6PX9GI/27440]
专题	中科院武汉岩土力学所
作者单位	1.Hubei Univ Technol, Sch Civil Engn Architecture & Environm, Wuhan 430068, Peoples R China 2.Chinese Acad Sci, Inst Rock & Soil Mech, Wuhan 430071, Peoples R China
推荐引用方式 GB/T 7714	Liu, Yiming,Huang, Shiqiang,Li, Lihua,et al. Experimental and Numerical Studies on the Direct Shear Behavior of Sand-RCA (Recycled Concrete Aggregates) Mixtures with Different Contents of RCA[J]. MATERIALS,2021,14(11):20.
APA	Liu, Yiming,Huang, Shiqiang,Li, Lihua,Xiao, Henglin,Chen, Zhi,&Mao, Haijun.(2021).Experimental and Numerical Studies on the Direct Shear Behavior of Sand-RCA (Recycled Concrete Aggregates) Mixtures with Different Contents of RCA.MATERIALS,14(11),20.
MLA	Liu, Yiming,et al."Experimental and Numerical Studies on the Direct Shear Behavior of Sand-RCA (Recycled Concrete Aggregates) Mixtures with Different Contents of RCA".MATERIALS 14.11(2021):20.