钢纤维石墨混凝土电热化冰试验研究  

Research on Electro-thermal Ice Melting of Steel Fiber Graphite Concrete

作　　者：袁玉卿[1,2] 周柄岑 张震[1,2] YUAN Yu-qing;ZHOU Bing-cen;ZHANG Zhen(Kaifeng Research Center for Engineering Repair and Material Recycle,Henan University,Kaifeng 475004,China;School of Civil Engineering and Architecture,Henan University,Kaifeng 475004,China)

机构地区：[1]河南大学开封市工程修复与材料循环工程技术研究中心,开封市475004 [2]河南大学土木建筑学院,开封市475004

出　　处：《公路》2024年第9期357-364,共8页Highway

基　　金：河南省高等学校重点科研项目,项目编号20A580001;开封市科技攻关计划项目,项目编号2003007。

摘　　要：为了验证钢纤维石墨混凝土提升混凝土的传热能力,根据最优配合比下的导热材料掺量(钢纤维体积掺量1%,石墨掺量占水泥质量20%)与0.42水灰比制作钢纤维石墨混凝土小板试件,并制作素混凝土小板试件作为试验对照组。选用碳纤维发热线作为发热源,将其预埋入试件内,进行室内升温、化冰试验。试验结果表明:输入功率为10.9 W/m、24.4 W/m和43.7 W/m时,分别加热300 min、150 min和90 min后,钢纤维石墨混凝土板表温度能达到约3.3℃、4.5℃和3.8℃,全程平均升温速率为0.046℃/min、0.100℃/min和0.159℃/min,相较于素混凝土板提高了12.20%、13.64%和13.57%。环境温度为-5.3℃、-10.5℃和-16.7℃时,分别加热75 min、105 min和150 min后,钢纤维石墨混凝土板表温度能达到约7.8℃、5.8℃和7.6℃,全程平均升温速率为0.153℃/min、0.155℃/min和0.162℃/min,相较于素混凝土板提高了14.38%、9.92%和13.29%。风速为0 m/s、1.8 m/s、2.7 m/s、3.4 m/s时,加热90 min后钢纤维石墨混凝土板表温度能达到约3.2℃、2.8℃、3℃、2.6℃,全程平均升温速率分别为0.094℃/min、0.090℃/min、0.092℃/min、0.088℃/min,相较于素混凝土板提高了13.25%、16.88%、15.00%、20.55%。-5℃环境下,输入功率为24.4 W/m和43.7 W/m时,融化1 cm的冰层,钢纤维石墨混凝土小板分别用时180 min和150 min,比素混凝土小板均提前30 min完成化冰,用时分别缩短了14.29%和16.67%。综合升温速率与化冰时间评价指标,钢纤维石墨混凝土具有良好的传热能力,可以起到提升混凝土传热能力的作用。To verify that steel fiber graphite concrete can improve the heat transfer capacity of concrete,small slab specimens of steel fiber graphite concrete are made based on the optimum mixing ratio of the heat conductive material(1%by volume of steel fiber and 20%by mass of graphite in cement)and water-cement ratio(0.42),and small slab specimens of plain concrete are prepared as a test control group.Carbon fiber heating wires are selected as the heat source and pre-embedded in the specimen to perform the indoor heating and de-icing test.The test results show that:when the input power is 10.9 W/m,24.4 W/m and 43.7 W/m,the surface temperature of the steel fibre graphite concrete slabs can reach about 3.3C,4.5℃and 3.8℃C after 300 min,150 min and 90 min of heating respectively,and the average heating rate throughout is 0.046℃/min,0.100℃/min and 0.159℃/min,which is 12.20%,13.64%and 13.57%higher than that of the plain concrete slab.At ambient temperatures of-5.3℃,-10.5℃and-16.7℃,the surface temperatures of the steel fiber graphite concrete slabs can reach about 7.8℃,5.8℃and 7.6°℃after heating for 75 min,105 min and 150 min respectively,and the average heating rates during the whole process are 0.153℃/min,0.155℃/min and 0.162℃/min,which are 14.38%,9.92%and 13.29%higher than those of the plain concrete slab.When the wind speed is Om/s,1.8 m/s,2.7 m/s,and 3.4 m/s,the surface temperature of the steel fiber graphite concrete slab can reach about 3.2℃,2.8℃,3℃,2.6℃after heating for 90 min,and the average heating rate of the whole process is 0.094C/min,0.090C/min,0.092℃/min,0.088℃/min,which is increased by 13.25%,16.88%,15.00%and 20.55%compared with that of the plain concrete slab.When the ambient temperature is-5℃and the input power is 24.4 W/m and 43.7 W/m,respectively,the heating of the steel fiber graphite concrete slabs to melt the 1 cm thick ice layer takes 180 min and 150 min,respectively,which is 30 min earlier than that of the plain concrete slabs to complete the ice melting,and t

关 键 词：道路工程 钢纤维 石墨 碳纤维发热线 电热化冰 

分 类 号：U416.2[交通运输工程—道路与铁道工程] U414.1