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Computers and Concrete Volume 35, Number 3, March 2025 , pages 231-243 DOI: https://doi.org/10.12989/cac.2025.35.3.231 |
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Mesoscale analysis of rubber particle effect on flexural strength of crumb rubber concrete |
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Huailiang Chen, Danda Li, Xing Ma, Zheng Zhong and El-Sayed Abd-Elaal
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| Abstract | ||
| Flexural strength is an indirect indicator for measuring the concrete's resistance to tensile stress caused by bending, shrinkage and temperature changes. This study aims to study the flexural strength of crumb rubber concrete (CRC) through mesoscale simulation and experimental testing. The internal structure of CRC was regarded as a five-phase material consisting of rubber, coarse aggregate, mortar, coarse aggregate-mortar interfacial transition zone (A-M ITZ), and rubber-mortar interfacial transition zone (R-M ITZ). The flexural strength of CRC specimens containing rubber particles of different contents, shapes, and sizes was calculated and compared. Mesoscale simulation showed that the addition of rubber reduces the flexural strength of concrete, and the reduction rate is mainly controlled by the content rather than the size, shape, and distribution of rubber particles. The thickness of R-M ITZ is around 0.05 mm, and its effect on the flexural strength of CRC is as low as 1.15% which can be ignored. The incorporation of rubber particles increases the heterogeneity of the internal structure of concrete, which increases the discreteness of the concrete's flexural strength. Numerical simulation also verified that treating the rubber particles as pores did not change the damage pattern of the CRC specimens and resulted in negligible differences in flexural strength. Rubber particles can be simulated through pores when analyze their effect on the flexural strength of concrete. | ||
| Key Words | ||
| crumb rubber concrete (CRC); flexural strength; mesoscale analysis | ||
| Address | ||
| Huailiang Chen: 1) UniSA STEM, University of South Australia, Adelaide, SA 5065, Australia, 2) School of Civil Engineering, Jiangsu College of Engineering and Technology, Nantong, 226006, China Danda Li and Xing Ma: UniSA STEM, University of South Australia, Adelaide, SA 5065, Australia Zheng Zhong: School of Science, Harbin Institute of Technology, Shenzhen 518055, China El-Sayed Abd-Elaal: 1) UniSA STEM, University of South Australia, Adelaide, SA 5065, Australia, 2) Department of Structural Engineering, Mansoura University, Egypt | ||