沥青混凝土路面耙松热传导试验与仿真分析

Harrowing Heat Conduction Test and Simulation Analysis of Asphalt Concrete Pavement

为了提高沥青混凝土路面就地热再生过程的加热效率,采取对试件进行热传导试验及FLUENT有限元仿真的方法,以不同厚度但配比及密实度相同的沥青混凝土试件为研究对象,设计制作热传导试验装置,测量试件上下表面温度并计算导热系数;运用Solidworks软件对试验过程进行有限元仿真,模拟建立热传导温度场,对试验过程进行验证。试验和仿真的结果表明:不同厚度但配比及密实度相同的沥青混凝土试件的导热系数基本相同,试件厚度显著影响沥青混凝土路面的底层加热温度,耙松改变路面结构后,热量更容易渗透到路面底层,从而提高热再生加热效率并降低能耗。

In order to improve the heating efficiency of asphalt concrete pavement in the process of hot-in-place recycling, heat conduction test and FLUENT finite element simulation were carried out on the specimen, taking asphalt concrete specimen of different thickness but with the same proportion and compactness as the research object, design and fabricate the heat conduction test device, measure the upper and lower surface temperatures of the specimen and calculate the thermal conductivity. Solidworks software was used to conduct finite element simulation of the test process, simulate and establish the heat conduction temperature field and verify the test process. Experiment and simulation results show that the thermal conductivity of asphalt concrete specimens with different thickness but same proportion and compactness is basically the same. The thickness of specimen significantly affects the bottom heating temperature of asphalt concrete pavement. After the pavement structure is changed by harrowing, heat can penetrate into the bottom of the pavement more easily, so as to improve the heating efficiency of thermal regeneration and reduce energy consumption.