堆石混凝土浇筑前后的非均质温度分布试验研究

余舜尧, 徐小蓉, 邱流潮, 金峰

清华大学学报（自然科学版） ›› 2022, Vol. 62 ›› Issue (9) : 1388-1400.

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清华大学学报（自然科学版） ›› 2022, Vol. 62 ›› Issue (9) : 1388-1400. DOI: 10.16511/j.cnki.qhdxxb.2022.21.022
堆石混凝土

堆石混凝土浇筑前后的非均质温度分布试验研究

  • 余舜尧1, 徐小蓉2, 邱流潮1, 金峰3
作者信息 +

Experimental study on heterogeneous temperature distribution of rock-filled concrete before and after casting

  • YU Shunyao1, XU Xiaorong2, QIU Liuchao1, JIN Feng3
Author information +
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摘要

堆石混凝土(rock-filled concrete,RFC)作为一种由大块堆石和自密实混凝土(self-compacting concrete,SCC)组成的非均质材料,浇筑前后的温度分布与常规混凝土有着较大区别。通过开展现场温度监测试验,获得了堆石混凝土在不同季节、不同位置、浇筑前后的温度变化数据,在此基础上进行了规律总结和理论分析。讨论了在浇筑前不同时空条件下堆石体温度分布的非均匀性,定量计算得到了气温对等效堆石体的影响深度约0.9 m；浇筑前堆石体的仓顶与仓底最大温差在夏季高温时能达到13℃；等效堆石体温度相比气温有约3 h的相位滞后。总结了在浇筑后不同季节的堆石混凝土温度变化规律,结果表明堆石和SCC在浇筑后的前8 h会进行快速的温度交换直到两者温度趋近一致；在混凝土温升过程中堆石体会辅助吸收SCC的部分水化热,降低了整仓堆石混凝土的温升；计算得到太阳辐射热引起的仓面上下游处的温度差异约3℃。该文研究结果对堆石混凝土的温度仿真数值计算以及可能的工程温控措施具有重要的参考意义。

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.

关键词

堆石混凝土 / 温度监测 / 非均质分布 / 浇筑温度 / 辅助吸热

Key words

rock-filled concrete / temperature monitoring / heterogeneous distribution / casting temperature / auxiliary heat absorption

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余舜尧, 徐小蓉, 邱流潮, 金峰. 堆石混凝土浇筑前后的非均质温度分布试验研究[J]. 清华大学学报（自然科学版）. 2022, 62(9): 1388-1400 https://doi.org/10.16511/j.cnki.qhdxxb.2022.21.022
YU Shunyao, XU Xiaorong, QIU Liuchao, JIN Feng. Experimental study on heterogeneous temperature distribution of rock-filled concrete before and after casting[J]. Journal of Tsinghua University(Science and Technology). 2022, 62(9): 1388-1400 https://doi.org/10.16511/j.cnki.qhdxxb.2022.21.022

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基金

徐小蓉,讲师,E-mail:xxrong@ncepu.edu.cn

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