Effects of pipe diameter, curing age and exposure temperature on chloride diffusion of concrete with embedded PVC pipe. (1st October 2022)

• Record Type: Journal Article
• Authors: Du, Ting; Li, Chenyu; Wang, Xiaonan; Ma, Liao; Qu, Fulin; Wang, Benwu; Peng, Jiliang; Li, Wengui
• Is Part Of: Journal of building engineering. Volume 57(2022)
• Publication Date: 2022-10-01
• Subjects: Concrete durability -- Chloride diffusion -- PVC pipe -- Pipe opening -- Coupled factors -- Exposure temperature; Building -- Periodicals; 690.05
• DOI: 10.1016/j.jobe.2022.104957
• Languages: English
• ISSNs: 2352-7102

Abstract

Abstract: Concrete structures are often embedded with pipe opening for the installation of pipelines which tends to weaken the integrity and durability. The effects of pipe diameter, curing age, and exposure temperature, on the chloride ion resistance of concrete with embedded PVC pipe (CEPP) were investigated in this paper. The testing parameters include compressive strength, electric flux density, chloride ion diffusion coefficient, chloride ion penetration depth, and chloride ion content. The results showed that electric flux density and chloride ion diffusion coefficient of CEPP increased with the diameter of PVC pipes following a second-degree parabola and a linear relation respectively, while the chloride ion diffusion coefficient decreased with the prolonging curing age. The chloride ion resistance and compressive strength of CEPP were decreased with the increase of pipe diameters, because the weak areas formed in the transition interfaces between the PVC pipes and concrete matrices and expanded with increased diameter. The chloride ion penetration depth and chloride ion content were relatively higher in the testing points near the PVC pipes than the ones far away from the PVC pipes. In addition, the rate of chloride ion penetration of CEPP could be accelerated by the higher exposure temperatures, leading to severer chloride ion penetration of CEPP. Finally, a novel modified Fick's second law diffusion model considering the effects of pipe diameters and curing age was proposed to predict the chloride ion resistance of CEPP. Highlights: Embedded PVC pipes have a detrimental effect on the strength and chloride ion resistance of CEPP. Electric flux density by CEF was agreement with the chloride ion diffusion coefficient tested by RCM. Both the chloride ion diffusion coefficient and difference in chloride ion diffusion coefficient decreased. Weak zone was formed around the interfaces between the embedded PVC pipes and concrete matrices.