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Research on chloride diffusion and flexural behavior of beams strengthened with TRC subjected to dry-wet cycles

2019; Elsevier BV; Volume: 229; Linguagem: Inglês

10.1016/j.conbuildmat.2019.116906

1879-0526

Yuntao Hua, Shiping Yin, Yulin Yu, Shan Li,

Structural Behavior of Reinforced Concrete

This paper presents an experimental study on the flexural durability of beams strengthened with TRC subjected to dry-wet cycles. The effects of dry-wet cycles (180, 210, 240, 270 and 330) and the short-cut fiber contents (0, 0.2%, 0.5% and 1%) on chloride transport and flexural behavior were investigated. The results showed that with the increase of dry-wet cycles, the chloride ion content in the TRC increased, while the diffusion coefficient decreased, the micro-structure of the TRC matrix was obviously damaged after 330 cycles. A certain amount of short-cut fibers was beneficial to improve the chloride transport resistance of the TRC matrix. The effect of increasing dry-wet cycles on the overall mechanical properties of the strengthened beams fluctuated when there were few dry-wet cycles. However, the mechanical properties of the strengthened beams significantly diminished after 330 cycles. The mechanical properties of the strengthened beams were enhanced with the increase of short-cut fiber content, and the promotion effect was obvious as it reached 1%. Finally, the ultimate bearing capacity formula of TRC-strengthened beams subjected to dry-wet cycles was modified based on the test results.