透水性沥青混合料热学行为研究.pdf

第40卷,第4期
公路工程
ol.40.,No,4
2015年8月
Highway Engineering
Al
2015
透水性沥青混合料热学行为研究
王兴无,周伯成2
(1.重庆三峡学院,重庆404100;2.重庆市水利投资(集团)有限公司,重庆401120)
[摘要]由材料观点针对透水性沥青混合料热行为进行研究,研究的热行为包括:材料本身吸、放热及热传
导系数量测;本研究中以不同最大粒径透水性沥青混合料进行车撤试件制作,并于压实完成以K-type热电偶探测
针进行降温量测,热传导系数的量测是以便携式热传导系数与比容量测仪进行量测,材料吸热试验是以卤素灯在
实验室进行加热模拟,以各项试验进行综合热行为的探讨。从实验室量测结果得到,传统密级配沥青混合料热传
导系数约1.3-1.8W/mK,而透水性沥青混合料量测结果由于孔隙率增加至20%,使得热传导系数降低至0.4
0.9W/mK,但透水性沥青混合料与密级配沥青混凝土都由相同材料组成,由于孔隙的增加使表面积增加,当获得
热能时,温度会有迅速升高的情形,透水性沥青混合料表面温度较密级配沥青混凝土高约4℃~6℃,由于透水性
沥青混合料热传导系数低,其热容量亦较低,因此吸收的热能量较少,降温放热时在高温阶段降温速率比密级配沥
青混凝土快。
[关键词]PAC;热学行为;热传导系数;生态路面;道路工程
[中图分类号]414.1[文献标识码]A
[文章编号]1674-0610(2015)04-0197-05
Thermal Behavior Research of Drainage Asphalt Mixture
WANG Xingwu, ZHOU Bocheng
1. Chongging Sanxia Institute, Chongqing 404100, China; 2. Chongqing Water Inverstment Group
Co., Ltd, Chongqing 401120, China)
I Abstract] This study by the material point of view in view of the drainage asphalt mixture to study
the thermal behavior, the thermal behavior of the studies included material itself, heat absorption and
heat conduction system quantity measurement; In this study with different particle size of the largest
drainage asphalt mixture of rutting specimens, and completed the compaction to cool down K-type ther
mocouple probe measurement, based on the measurement of the heat transfer coefficient of the portable
heat conduction coefficient and given a measuring instrument for measuring, material heat test is halogen
heating simulation in lab, and in each experimental comprehensive thermal behavior. From laborator
measurements, the traditional dense gradation asphalt mixture heat transfer coefficient is about 1.3-1.8
W/mk, asphalt mixing rate of permeability and measuring results due to the porosity increased to 20%
results in lower heat transfer coefficient of 0.4-0.9 W/mk, but drainage asphalt mixture with dense
gradation asphalt concrete are made of the same material, due to the increase of the pore surface area in-
creases, when the heat, the temperature will be rise rapidly, drainage asphalt mixture surface tempera-
ture is relatively dense gradation asphalt concrete of high about 4-6 C, due to the drainage asphalt mix
ture low heat conduction coefficient, the heat capacity is low, so the thermal energy absorption is less,
when the temperature and heat release in high temperature stage cooling rate is faster than dense grada
tion asphalt concrete.
I Key words] PAC; thermal behavior; heat transfer coefficient; road engineering
过去路面采用不透水设计,使得大地丧失良好减少原有植被地,取而代之的为建筑物及人工路面,
渗透及涵养水源的功能,且因城市化日新的提升而使雨水渗入机会大幅减少,部分地区遇台风或大雨
[收稿日期]2014-05-04
作者简介]王兴无(1967-),男,重庆万州人,高级工程师,研究方向:士木T.程。