Effects of synthetic fibres on the fracture behaviours of recycled coarse aggregate concrete

Lin, Qian; Luo, Surong; Lin, Kaida; Wang, Dehui

doi:10.1016/j.conbuildmat.2024.135370

Cited by 4 publications

(1 citation statement)

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“…RAC is used as a building material in all aspects of human life [ 1 , 2 , 3 , 4 ]. Not only can it realize the recycling of construction resources and alleviate the pressure of resource scarcity, but it can also reduce the impact of the construction industry on the environment, which can be said to be a multi-benefit [ 5 , 6 , 7 , 8 ]. However, there is a large amount of old mortar in recycled aggregate that cannot be completely removed as it is still attached to the original aggregate particles, and there is a large number of micro-cracks, resulting in the mechanical properties of recycled aggregate and natural aggregate being different.…”

Section: Introductionmentioning

confidence: 99%

Research on Macroscopic Mechanical Behavior of Recycled Aggregate Concrete Based on Mesoscale

Yang,

Shang,

Zhang

et al. 2024

Materials

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Recycled concrete is a heterogeneous composite material, and the composition and volume fraction of each phase affect its macroscopic properties. In this paper, ANSYS APDL was used to construct a two-dimensional numerical model of recycled aggregate concrete with different replacement rates of recycled aggregate (0%, 25%, 50%, 75% and 100%), and a uniaxial compression test was carried out to explore the relationship between recycled aggregate content and its macroscopic mechanical behavior. On this basis, the numerical simulation of different strain rates (0.1 s−1, 0.05 s−1, 0.01 s−1, 0.005 s−1 and 0.001 s−1) was carried out. It was found that with the increase in the recycled aggregate replacement rate, the peak stress decreases first and then increases, and the peak strain increases continuously. When the replacement rate of recycled aggregate exceeds 50%, the overall damage area of the material increases rapidly. The strain rate will change the path of the micro-crack initiation and expansion of recycled concrete, as well as the process of damage accumulation and evolution. As a result, the unit area and shape of recycled concrete are different at different strain rates, and the damage degree of each phase material is also different.

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