热反射隔热涂料对混凝土温度场的影响规律研究

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发布时间：2022-04-18

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日光辐射下结构内部产生的温度荷载是混凝土桥梁及轨道等结构的主要荷载，通过特殊措施改变结构温度场可降低结
构荷载，从而降低结构的造价或减小结构的不利温度应力 (及变形)。探讨了混凝土表面涂刷反射隔热涂料对混凝土温度场的影响
规律，通过模拟日光照射，测试了反射隔热涂料对不同强度等级的混凝土试件表面温度、芯部温度、温升 (降)速率及温度梯度的影
响规律。结果表明，白色反射隔热涂料可有效地降低混凝土的表面温度、芯部温度、温升 (降)速率，并可显著降低混凝土的温度梯
度。研究结果为主动降低特殊混凝土结构温度荷载提供了一种新思路。
关键词：混凝土：反射隔热涂料；温度场；温度梯度
中图分类号：TU56+1．6 文献标识码：A 文章编号：1001—702X(2015)07—0027—06
Study on the effect of reflective coating m aterials on the tem perature field of
concrete under thermal radiation
LIU Wentao ，YUAN QiangI,XIE ，LIU Laimingz，RA0 Huimin$z
(1．School of Civil Engineering of Central South University，National Engineering Laboratory for High Speed Railway Construction，
Changsha 410075，Hunan，China：2．Department of Construction Management，Railway Bureau of Nanchang，Nanchang 430000，
Jiangxi，China；3．Jing Fu Ming Gan Passenger Dedicated Line Co．Ltd．，Fuzhou 350002，Fujian，China)
Abstract：Temperature loadings generated in bridge or rail concrete structures by sun radiation are the main loadings of
structures．Changing temperature field of structures by using special measures may reduce cost or detrimental temperature stress (or
displacement) of structures．This paper studies the effect of reflective coating materials on the temperature field of concrete under
thermal radiation． The effect of reflective coating materials on the surface temperature，core temperature，temperature rising
(decreasing) rate and temperature gradient of concrete specimens with different strength grade were studied by using simulated
sunlight radiation． Results showed that white reflective coating materials can effectively decrease the surface temperature，core
temperature and temperature rising (decreasing)rate of concrete，and significantly decrease the temperature gradient．Th is research
provides a new method for initiatively reducing tempe rature loadings of special concrete structure．
Key words：concrete，reflective coating material，temperature field，temperature gradien