PVA纤维增强砖骨料再生混凝土数值模拟及尺寸效应研究

doi:10.11896/cldb.23100214

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Abstract Compared to rigid fibers, PVA fibers have a finer diameter and a more complex distribution in concrete. Two modeling methods were used to establish a microscopic model of PVA fiber reinforced recycled concrete (FFF-BAC). Model 1 (M1): considering the combination of cement mortar matrix and PVA fiber as a special engineering cement-based composite material (S-ECC), and combined with brick aggregate (BA) and interface transition zone (ITZ) to form FFF-BAC. Model 2 (M2): FFF-BAC is considered as a four phase material composed of cement mortar, fiber, BA, and ITZ. M1 and M2 were established respectively, and compared with the uniaxial compressive strength test results of flexible fiber reinforced brick aggregate recycled concrete (FFF-BAC), to verify the accuracy of the two models. The results indicate that the M1 simulation is more consistent with the experimental results, with a maximum error of 11.0% for each parameter. The damage and failure process of FFF-BAC was studied, and the effect of BA content on compressive strength was predicted based on M1. The failure modes of different sizes of FFF-BAC were explored. Combining Bazant's size effect formula, a size effect formula for FFF-BAC considering BA content was established.

Key words： recycled concrete brick aggregate meso-scale simulation compressive strength size effect

Published: 10 February 2025 Online: 2025-02-05

CLC number:

TU501

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	Articles by authors
	JI Yongcheng
	WANG Dayang
	JIA Yanmin

Cite this article:

JI Yongcheng,WANG Dayang,JIA Yanmin. Numerical Simulation and Size Effect Study on PVA Fiber-reinforced Brick Aggregate Recycled Concrete[J]. Materials Reports, 2025, 39(3): 23100214-11.

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http://www.mater-rep.com/EN/10.11896/cldb.23100214 OR http://www.mater-rep.com/EN/Y2025/V39/I3/23100214

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