Long term performance of recycled concrete beams with different water–cement ratio and recycled aggregate replacement rate
不同水灰比和再生骨料替代率再生混凝土梁的长期性能
水セメント比と再生骨材交換率が異なる再生コンクリート梁の長期性能
물-시멘트 비율과 재활용 골재 대체율이 다른 재활용 콘크리트 보의 장기 성능
Desempeño a largo plazo de vigas de concreto reciclado con diferente relación agua-cemento y tasa de reemplazo de agregado reciclado
Performance à long terme des poutres en béton recyclé avec différents rapports eau-ciment et taux de remplacement des granulats recyclés
Долгосрочные характеристики балок из переработанного бетона с различным водоцементным отношением и коэффициентом замены переработанного заполнителя
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
Frontiers of Structural and Civil Engineering, 31 May 2022
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.
