Year
Month
(Peer-Reviewed) Long term performance of recycled concrete beams with different water–cement ratio and recycled aggregate replacement rate
Jingwei YING 应敬伟 ¹ ², Feiming SU 苏飞明 ¹, Shuangren CHEN 陈双仁 ¹
¹ School of Civil Engineering and Architecture, Guangxi University, Nanning 530004, China
中国 南宁 广西大学土木建筑工程学院
² Key Laboratory of Engineering Disaster Prevention and Structural Safety of China Ministry of Education, Guangxi Key Laboratory of Disaster Prevention and Engineering Safety, School of Civil Engineering and Architecture, Guangxi University, Nanning, 530004, China
中国 南宁 广西大学土木建筑工程学院 工程防灾与结构安全教育部重点实验室 广西防灾减灾与工程安全重点实验室
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.
Long term performance of recycled concrete beams with different water–cement ratio and recycled aggregate replacement rate_1
Long term performance of recycled concrete beams with different water–cement ratio and recycled aggregate replacement rate_2
Long term performance of recycled concrete beams with different water–cement ratio and recycled aggregate replacement rate_3
Long term performance of recycled concrete beams with different water–cement ratio and recycled aggregate replacement rate_4
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