【摘要】 山地城市因地势起伏大,陡坡急弯多,对路面强度要求高,其透水沥青混合料配合比设计不同于平原地区.进行山地海绵城市透水沥青混合料配合比设计时,由于纵坡的影响可适当减小渗透系数,以提供结构层强度.对原材料的基本性能进行检测,通过空隙率找到了混合料强度与渗透系数之间的相关性,拟定出目标空隙率;选取三种设计级配,结合体积法和计算法对混合料的空隙率进行实测,发现设计级配2成型的试件符合目标空隙率的要求,根据Cantabro飞散试验和Schellenberg析漏试验的结果确定其最佳沥青用量;对混合料的高温稳定性、水稳定性及渗水性进行了检测.结果表明:设计级配2在空隙率为18.038%,最佳沥青用量为4.9%的前提下,相关路用性能满足规范的技术要求.更多还原

【Abstract】 Mountain cities have high requirements for pavement strength due to large undulating terrain and sharp bends on steep slopes. The mix proportion design of permeable asphalt mixture is different from that in plain areas. When designing the mixture ratio of permeable asphalt mixture in mountainous sponge city, due to the influence of longitudinal slope, the permeability coefficient can be appropriately reduced to provide structural layer strength. The basic properties of the raw materials were tested, and the correlation between the strength and permeability coefficient of the mixture was found through the void ratio, and the target void ratio was drawn up. Three design gradations were selected, and the void ratio of the mixture was measured by volume method and calculation method. It is found that the specimen formed by design gradation 2 meets the requirements of the target void ratio. The optimum asphalt content was determined according to the results of Cantabro scattering test and Schellenberg leakage analysis test. The high temperature stability, water stability and water permeability of the mixture were tested. The results show that under the premise of 18.038% void ratio and 4.9% optimum asphalt content, the relevant road performance meets the technical requirements of the specification.更多还原