Papers by Keyword: Reinforcing Bar Corrosion

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Authors: Xin Hua Cai, Zhen He, Shi Lang Xu
Abstract: Ultra high toughness cementitious composite (UHTCC) shows a unique characteristic of limit the crack width with multiple fine cracks whether it is subjected to tensile load or bending load. The failure pattern of UHTCC exhibits saturated multiple fine cracks, so the durability of structures will be improved markedly by utilizing UHTCC partly or entirely instead of concrete. In this study, considering the tensile strain capacity of UHTCC, a formula for calculating the critical rebar corrosion ratio when the UHTCC cover cracking due to rebar corrosion through the theory of plasticity and cylindrical cavity expansion theory. The effectiveness of UHTCC for restraining the cover cracking due to rebar corrosion has been proved by a calculated example. The influences on critical rebar corrosion when the UHTCC cover cracking due to rebar corrosion have been analyzed. The analytical results showed that UHTCC could effectively retard the cover expansive cracking due to corrosion of reinforcing bars, and prolong the service life of concrete structures subjected to the environment being at risk of corrosion.
Authors: Yue Li, Xiu Li Du, Chun E Sui
Abstract: Self-compacting Concrete (SCC) has many good properties such as high fluidity, good cohesiveness and resistance to segregation. Therefore, SCC should have higher durability compared to ordinary vibrated concrete in theory. At the same time, the cementitious materials and additives used in SCC are much more than that of used in ordinary concrete, which will cause SCC to generate shrinkage cracks easily and deteriorate its durability. So the durability of SCC should be studied further. In this paper, C30~C60 SCC were prepared, and then the permeability and reinforcing bar corrosion of reinforced self-compacting concrete were conducted. The results show that the permeability of SCC is lower which make sure the embedded reinforcing bars have high resistance to the corrosion.
Authors: Yue Li, Chao Yan, Xiu Li Du, Yong Zhang, Qiao Lei
Abstract: Self-compacting concrete (SCC) has been used widely. However, the study of life-span prediction of self-compacting reinforced concrete is not enough under chloride ion corrosion condition, For the reinforcing bars corrosion that chlorine ions invade into SCC,the life-span prediction of Self-Compacting Concrete is the key issue. In this paper, the life-span prediction model of SCC structure under chloride ion corrosion condition is established and used to analyze the life-span prediction of SCC samples. Prediction results matched the test results very well, which shows the rationality of this prediction formula.
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