- ISSN 0258-2724
- CN 51-1277/U
- EI Compendex
- Scopus
- Indexed by Core Journals of China, Chinese S&T Journal Citation Reports
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- Chinese Science Citation Database
| Citation: | LI Fuhai, WEN Tao, TANG Huiqi, LI Jiyun, LI Rui, CHEN Zhao, LI Xueyou, LI Chao. Shrinkage Characteristics and Anti-Crack Technology of Early-Age Concrete under Large Dry-Cold Temperature Difference[J]. Journal of Southwest Jiaotong University, 2023, 58(6): 1405-1412. doi: 10.3969/j.issn.0258-2724.20210839
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In order to explore the shrinkage and deformation laws of early-age concrete under large dry-cold temperature differences and reduce the risk of cracking, three curing methods were used for early-age curing of concrete. The compressive strength, splitting tensile strength, free shrinkage rate, and maximum restraint stress were used as the characterization methods. Basic mechanical performance test, free shrinkage test, and restraint shrinkage test were designed. The comprehensive multi-index grey correlation method was adopted to analyze the anti-cracking performance of concrete under different curing methods. In addition, a nano-coating thermal insulation performance test was designed to explore its thermal insulation performance on concrete. The test results show that the use of nano-coating reduces the average temperature difference inside the cylindrical concrete specimen by 2.95 ℃ in the circulating temperature of ‒20.0–15.0 ℃; compared with those under standard curing, the compressive and splitting tensile strengths of concrete under the three curing methods are significantly reduced, and the large dry-cold temperature difference is not conducive to the strength development of concrete. The free shrinkage rate changes significantly with temperature. Specifically, as the temperature decreases, the free shrinkage rate increases, and as the temperature rises, the free shrinkage rate decreases. In addition, extreme values appear at ‒20.0 ℃ and 15.0 ℃; the maximum restraint stress is affected by the curing method. Under natural curing, the maximum restraint stress develops the fastest, with the largest final value, followed by that under film curing. Under coating curing, the maximum restraint stress develops the slowest, with the smallest final value. The gray correlation degree under coating curing is as high as 0.9149, which is significantly higher than that under natural curing and film curing, showing excellent anti-cracking performance.
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