在冬季施工中使用红外辐射对掺有 PCM 的砾石粘土进行升温和防冻处理

IF 6.5 2区 工程技术 Q1 CONSTRUCTION & BUILDING TECHNOLOGY Case Studies in Construction Materials Pub Date : 2024-07-05 DOI:10.1016/j.cscm.2024.e03483
Jianyu Liang, Donghai Liu
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引用次数: 0

摘要

冻融循环容易造成粘土的结构破坏和力学性能下降。为防止寒冷地区高心墙堆石坝心墙区的冻融循环问题,可采用掺有相变材料(GC-PCM)的碎石粘土作为筑坝材料,在冬季施工时具有一定的防冻性能。然而,在严寒和大风天气下,GC-PCM 施工作业区仍有可能出现冻结风险。为了解决 GC-PCM 的冻结问题,本研究在不影响原有施工程序的情况下,开发了一种红外线辐射加热装置,并进行了室内试验,研究 GC-PCM 接受红外线辐射后的升温性能。同时,针对 GC-PCM 施工作业区的升温和防冻性能提出了数值模拟方法,并分析了不同因素(包括辐射通量、红外装置的移动速度和风速)对防冻性能的影响。主要结果表明(1) 室内试验验证了所提出的数值模拟方法的有效性;(2) 在 12 月的典型天气下,接受 8 次红外辐射后,PCM 含量为 4% 的 GC-PCM 建筑工作区在 24 小时内仍能保持不冻;(3) 降低红外装置的移动速度比增加辐射次数更能改善 GC-PCM 的防冻性能。本研究验证了在 GC-PCM 上应用红外线辐射加热方法的可行性,为冬季施工期间的碎石粘土防冻提供了一种潜在的技术手段。
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Temperature rising and anti-freezing performance of gravel-clay mixed with PCM applying infrared radiation during winter construction

Freeze–thaw cycles could easily cause the structural damage and mechanic performance deterioration of clay. In order to prevent the freeze–thaw cycles problem in the core-wall zone of the high core-wall rock-fill dam in cold regions, gravel-clay mixed with phase change material (GC-PCM) can be used as damming material and present a certain level of anti-freezing performance during winter construction. However, GC-PCM construction work area is still likely to run a risk of freezing under the severe cold and strong wind weather. In order to solve the freezing problem of GC-PCM, this study developed an infrared radiant heating device without interfering with the original construction procedure and conducted an indoor test to investigate the temperature rising performance of GC-PCM after receiving infrared radiation. Also, a numerical simulation method was proposed for the temperature rising and anti-freezing performance of the GC-PCM construction work area and the effects of different factors (including radiant pass, moving speed of infrared device and wind speed) on the anti-freezing performance were analysed subsequently. Main results show that: (1) the effectiveness of proposed numerical simulation method is validated by the indoor test; (2) after receiving 8-pass infrared radiation, the GC-PCM construction work area at 4 % PCM content remains unfrozen in 24 hours under the typical weather in December; and (3) instead of increasing radiant passes, reducing the moving speed of infrared device can better improve the anti-freezing performance of GC-PCM. This study validates the feasibility of applying infrared radiant heating method on GC-PCM, providing a potential technical means for gravel-clay anti-freezing during winter construction.

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来源期刊
CiteScore
7.60
自引率
19.40%
发文量
842
审稿时长
63 days
期刊介绍: Case Studies in Construction Materials provides a forum for the rapid publication of short, structured Case Studies on construction materials. In addition, the journal also publishes related Short Communications, Full length research article and Comprehensive review papers (by invitation). The journal will provide an essential compendium of case studies for practicing engineers, designers, researchers and other practitioners who are interested in all aspects construction materials. The journal will publish new and novel case studies, but will also provide a forum for the publication of high quality descriptions of classic construction material problems and solutions.
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