Long term performance of recycled concrete beams with different water–cement ratio and recycled aggregate replacement rate

Jingwei YING, Feiming SU, Shuangren CHEN

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Front. Struct. Civ. Eng. ›› 2022, Vol. 16 ›› Issue (3) : 302-315. DOI: 10.1007/s11709-022-0803-7
RESEARCH ARTICLE

Long term performance of recycled concrete beams with different water–cement ratio and recycled aggregate replacement rate

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Abstract

The purpose of this study is to reveal the service performance of recycled aggregate concrete (RAC) components for different values of water−cement ratio and replacement rate of recycled coarse aggregate (RCA). Generally, the concrete strength decreases with the increase of the replacement rate of RCA, in order to meet the strength requirements when changing the replacement rate of RCA, it is necessary to change the water−cement ratio at the same time. Therefore, the axial compressive strengths of prism with 25 mix proportions, the short-term mechanical properties and long-term deformation properties of reinforced concrete beams were tested respectively by changing water−cement ratio and RCA replacement rate. The bearing capacity and the strain nephogram of samples under different loads were obtained using the Digital Image Correlation (DIC) method, and a self-made gravity loading experimental device was used for long-term deformation investigation. Results showed that the damage pattern of RAC was the same as that of natural aggregate concrete (NAC), but the brittleness was more pronounced. The brittleness of concrete before failure can be reduced more effectively by adjusting the replacement rate of RCA than by adjusting the water−cement ratio. The water−cement ratio has an evident influence on the axial compressive strength and early creep of concrete, while the replacement rate of RCA has a remarkable effect on the long-term deformation of the concrete beams.

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Keywords

recycled concrete / beam / the replacement rate of recycled coarse aggregate / water–cement ratio / digital image correlation

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Jingwei YING, Feiming SU, Shuangren CHEN. Long term performance of recycled concrete beams with different water–cement ratio and recycled aggregate replacement rate. Front. Struct. Civ. Eng., 2022, 16(3): 302‒315 https://doi.org/10.1007/s11709-022-0803-7

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Acknowledgements

The authors acknowledge the financial support from the National Natural Science Foundation of China (Grant Nos. 52168015, 51768005) and Natural Science Foundation of Guangxi Province (No. 2018GXNSFAA281333).

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2022 Higher Education Press
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