透水性沥青混合料热学行为研究  

Thermal Behavior Research of Drainage Asphalt Mixture

作　　者：王兴无[1] 周伯成 

机构地区：[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

出　　处：《公路工程》2015年第4期197-201,共5页Highway Engineering

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辙试件制作,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1.3~1.8 W/m K,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0.4~0.9 W/m K,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。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 thermocouple 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 laboratory measurements,the traditional dense gradation asphalt mixture heat transfer coefficient is about 1. 3 ~ 1. 8W / m K,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 / m K,but drainage asphalt mixture with dense gradation asphalt concrete are made of the same material,due to the increase of the pore surface area increases,when the heat,the temperature will be rise rapidly,drainage asphalt mixture surface temperature is relatively dense gradation asphalt concrete of high about 4 ~ 6 ℃,due to the drainage asphalt mixture 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 gradation asphalt concrete.

关 键 词：PAC 热学行为 热传导系数 生态路面 道路工程 

分 类 号：U414.1[交通运输工程—道路与铁道工程]