| ROCK-FILLED CONCRETE |
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Experimental study on heterogeneous temperature distribution of rock-filled concrete before and after casting |
| YU Shunyao1, XU Xiaorong2, QIU Liuchao1, JIN Feng3 |
1. College of Water Resources & Civil Engineering, China Agricultural University, Beijing 100083, China;
2. School of Water Resources and Hydropower Engineering, North China Electric Power University, Beijing 102206, China;
3. State Key Laboratory of Hydroscience and Engineering, Tsinghua University, Beijing 100084, China |
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Abstract Rock-filled concrete (RFC) is a heterogeneous material composed of large rocks and self-compacting concrete (SCC), and its temperature distribution before and after pouring differs significantly from that of conventional concretes. The temperature variation data of RFC in different seasons, at different locations, and before and after pouring were obtained by conducting on-site experiments for temperature monitoring, and the summary of laws and theoretical analysis was performed on this basis. Under various spatial and temporal conditions, the nonuniformity distribution of the rockfill temperature before RFC pouring was discussed. Quantitative calculations revealed that the influence depth of the air temperature on the equivalent rockfill can be as high as 0.9 m. In summer, the maximum temperature difference between the top and bottom of the rockfill can reach 13℃, and the phase lag of the equivalent rockfill temperature is approximately 3 h compared to the air temperature. The temperature variation regularity of the RFC after pouring in different seasons was summarized. According to the research results, there was a rapid temperature exchange between the rockfill and the SCC, especially in the first 8 h after pouring, until both temperatures were uniform. During the temperature rise process, the rockfill will absorb some of the SCC's hydration heat, thereby reducing the overall temperature rise of the RFC. The temperature difference caused by solar radiation at the upper and lower reaches of the lift surface is about 3℃. The results of this study have important implications for numerical simulations of RFC temperature and possible engineering temperature control measures.
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| Keywords
rock-filled concrete
temperature monitoring
heterogeneous distribution
casting temperature
auxiliary heat absorption
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Issue Date: 18 August 2022
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2022,
Vol. 62
