数值模拟骨料颗粒形状和级配对再生混凝土力学性能的影响

doi:10.11896/cldb.21030052

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Abstract Recycled concrete is a multiphase composite material. As its main component, the aggregate serves as skeleton and support and has a profound impact on its performance. This work conducted theoretical analysis, experiments and numerical simulations to establish a characteristic model that considers aggregate gradation and shape based on fractal theory. The developed model was used to analyze the characteristics of recycled aggregates. On this basis, a uniaxial compression simulation experiment with different aggregate characteristics was designed to simulate the failure process in recycled concrete. Results show: (i) as the gradation of recycled coarse aggregates approaches the maximum-density curve, the gradation fractal dimension increases, as do the peak stress and elastic modulus accordingly; (ii) the smoother and more regular the aggregate particles, the smaller the aggregate shape eigenvalues and the larger the peak stress and elastic modulus; (iii) in designing the mix proportions, a dense aggregate gradation should be used and all simply crushed recycled concrete aggregates should be reshaped. The above results provide a theoretical basis for renewable aggregate recycling and engineering design.

Key words： recycled concrete particle shaping fractal theory mechanical property

Published: 10 August 2022 Online: 2022-08-15

CLC number:

TV43

Fund:National Key Research and Development Project of China (2018YFC0406803), Open Project of Research Centre on Levee Safety & Disaster Prevention Ministry of Water Resources(2018008) and Graduate Education Innovation Program Fund of North China University of Water Resources and Electric Power(YK2020-06).

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	Articles by authors
	GUO Lixia
	LI Song
	ZHONG Ling
	GUO Lei
	WANG Lunyan
	ZHANG Fangfang

Cite this article:

GUO Lixia,LI Song,ZHONG Ling, et al. A Numerical Simulation Study of the Effects of Aggregate Particle Shape and Gradation on the Mechanical Properties of Recycled Concrete[J]. Materials Reports, 2022, 36(15): 21030052-7.

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http://www.mater-rep.com/EN/10.11896/cldb.21030052 OR http://www.mater-rep.com/EN/Y2022/V36/I15/21030052

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