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Influence of compressive stress on chloride transport in the interfacial zone of precast and cast-in-place concrete
Structural Concrete ( IF 3.2 ) Pub Date : 2020-08-04 , DOI: 10.1002/suco.201900147
Jie Zhao 1 , Fumin Li 1 , Xiaoya Luo 2
Affiliation  

The large number of interfacial zones of precast and cast-in-place concrete weakens the durability and resistance to chloride penetration of fabricated structures. This study investigated the chloride transport behavior in the interfacial zone of precast and cast-in-place concrete through long-term wet–dry cycle experiments. The two influencing factors of compressive stress and distance to the interface were investigated. A chloride concentration test was conducted to investigate the chloride distribution profile, the chloride diffusion coefficient Dapp, and the surface chloride concentration Cs,∆x. The values of Dapp and Cs,∆x correlated with both the location in the interfacial zone and compressive stress, and both dependencies showed complex interactions. All specimens showed different degrees of this interfacial zone effect, which was weakened by compressive stress. Based on the test results, empirical models were developed (by regression) to quantify the dependences of Dapp and Cs,∆x to both compressive stress level and distance to the interface. Applicability of the models was verified.

中文翻译:

压应力对预制和现浇混凝土界面区氯离子迁移的影响

预制和现浇混凝土的大量界面区域削弱了装配式结构的耐久性和抗氯化物渗透能力。本研究通过长期干湿循环实验研究了预制和现浇混凝土界面区的氯离子迁移行为。研究了压应力和界面距离两个影响因素。进行氯化物浓度测试以研究氯化物分布曲线、氯化物扩散系数D app和表面氯化物浓度C s , Δx。的值d的应用程序Ç小号ΔX与界面区域中的位置和压应力相关,并且这两种依赖性都表现出复杂的相互作用。所有试样都表现出不同程度的这种界面区效应,这种效应被压应力削弱了。根据测试结果,开发了经验模型(通过回归)来量化D appC s , ∆x对压缩应力水平和到界面的距离的依赖性。验证了模型的适用性。
更新日期:2020-08-04
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