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Advances in Concrete Construction Volume 12, Number 5, November 2021 , pages 411-418 DOI: https://doi.org/10.12989/acc.2021.12.5.411 |
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Degradation of roller compacted concrete subjected to low-velocity fatigue impacts and salt spray cycles |
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Longxin Gao, Yong Lai, Huigui Zhang, Jingsong Zhang and Wuman Zhang
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| Abstract | ||
| Roller compacted concrete (RCC) used in the island reef airport runway will be subjected to the coupling actions of the fatigue impacts and the salt spray cycles, which will accelerate the deterioration of runway concrete and even threaten the flight safety. A cyclic impact testing machine and a climatic chamber were used to simulate the low-velocity fatigue impact and the salt spray cycles, respectively. The physical properties, the microstructures and the porosity of RCC were investigated. The results show the flexural strength firstly increases and then decreases with the increase of the fatigue impacts and the salt spray cycles. However, the decrease in the flexural strength is significantly earlier than the compressive strength of RCC only subjected to the salt spray cycles. The chlorine, sulfur and magnesium elements significantly increase in the pores of RCC subjected to 30000 fatigue impacts and 300 salt spray cycles, which causes the decrease in the porosity of RCC. The coupling effects of the fatigue impacts and the salt spray cycles in the later period accelerates the deterioration of RCC. | ||
| Key Words | ||
| damage; fatigue impacts; roller compacted concrete (RCC); salt spray cycles | ||
| Address | ||
| Longxin Gao: School of Transportation Science and Engineering, Beihang University, Beijing, China Yong Lai: China Airport Construction Group Co.,Ltd., Beijing, China Huigui Zhang: School of Transportation Science and Engineering, Beihang University, Beijing, China Jingsong Zhang: School of Transportation Science and Engineering, Beihang University, Beijing, China Wuman Zhang: School of Transportation Science and Engineering, Beihang University, Beijing, China | ||
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