Abstract
Vibrating consolidation process is widely applied to field construction of cement concrete. However, high-frequency vibration can easily lead to the settlement of coarse aggregates (CAs) and then affects the durability of hardened concrete. This study has developed a 3-D concrete model to investigate the CA settlement caused by vibration and its effect on long-term chloride transport in concrete. Based on the proposed model, the influence mechanism of CA settlement on both chloride concentration distribution and initiation time of reinforcement corrosion is discussed in detail. The results indicate that due to the settlement, a more obvious fluctuation of chloride concentration along the height direction of concrete specimen can be observed with the increase of vibration time. According to the model prediction, the corrosion of the top steel bar initiates 1.03–1.80 years earlier than that of the bottom steel bar under different vibration time. The proposed model provides a new method to probe into the influence of vibration-induced settlement on chloride ingress in hardened concrete.
Keywords
Chloride transport; Corrosion initiation; Durability; CA settlement; Vibration; Numerical study
Location
University of Jinan
Recommended Citation
Liu, Qing-feng and Cai, Yuxin, "Numerical investigation on aggregate settlement and its effect on the durability of hardened concrete" (2022). International Conference on Durability of Concrete Structures. 18.
https://docs.lib.purdue.edu/icdcs/2022/parti/18
Event Website
http://icdcs2022.ujn.edu.cn/index.htm
Numerical investigation on aggregate settlement and its effect on the durability of hardened concrete
University of Jinan
Vibrating consolidation process is widely applied to field construction of cement concrete. However, high-frequency vibration can easily lead to the settlement of coarse aggregates (CAs) and then affects the durability of hardened concrete. This study has developed a 3-D concrete model to investigate the CA settlement caused by vibration and its effect on long-term chloride transport in concrete. Based on the proposed model, the influence mechanism of CA settlement on both chloride concentration distribution and initiation time of reinforcement corrosion is discussed in detail. The results indicate that due to the settlement, a more obvious fluctuation of chloride concentration along the height direction of concrete specimen can be observed with the increase of vibration time. According to the model prediction, the corrosion of the top steel bar initiates 1.03–1.80 years earlier than that of the bottom steel bar under different vibration time. The proposed model provides a new method to probe into the influence of vibration-induced settlement on chloride ingress in hardened concrete.
https://docs.lib.purdue.edu/icdcs/2022/parti/18
