沥青混凝土预埋碳纤维绳发热升温试验

Experiments on heating and warming of carbon fibers ropes embedded in asphalt concrete

为了研究预埋碳纤维绳(碳绳)发热对沥青混凝土表面温度变化的影响规律,进行了不同长度碳绳单元的发热升温试验,绘制了升温及降温曲线,拟合得到温度变化与时间的数学关系式,进行了功率及用电量分析。研究结果表明:随着时间的延长,试件表面温度有持续上升趋势,与环境温度相比,2.5m长碳绳发热单元15min升高了4℃;3.5m、4.5m、5.5m长碳绳发热单元30min分别升高了3.5℃、3.2℃、1.3℃;单元发热功率分别为498W/m2、292W/m2、186W/m2、119W/m2、89 W/m2;断电后试块表面降温过程非常缓慢,温度变化与通电时间有良好的数学相关性;碳绳发热性能良好,沥青混凝土中埋设碳绳能起到较好的发热升温效果。依据降雪带的分布,推荐了发热单元的选择方案及设计方法。

To study the laws of carbon fiber rope（carbon rope）embedded in the asphalt concrete influencing on its surface temperature,this paper conducted the heating and warming experiments of different length carbon rope units.Meanwhile,the warming and cooling curves were drawn.Mathematical relationships between temperature and time were obtained through fitting.Moreover,the power and electricity consumption were analyzed.The results show that the surface temperatures of specimens are on the rise with the extension of time.Compared to the environment temperature,2.5mlong carbon rope heating unit increases by 4℃in 15 min.In 30 min,the heating units of 3.5m,4.5m,5.5mlong carbon ropes increase by 3.5℃,3.2 ℃,and 1.3 ℃,respectively.The unit heating powers are 498 W/m2,292 W/m2,186 W/m2,119 W/m2,and 89 W/m2,severally.After the power supply is cut off,the surface cools very slowly.It has good mathematical correlation between temperature change and conduction time.In short,the carbon rope heating performance is favorable,whichcan have better heat warming effects when it is embedded into the asphalt concrete.According to snowfall belt distribution,the selection scheme and design method of heating unit were recommended.