抗滑表层沥青混合料GAC-13组成及性能分析

Composition and Performance Analysis of GAC-13 Asphalt Mixture for Anti Sliding Surface

为研究细集料材质、规格对抗滑表层沥青混合料GAC-13组成设计及性能的影响,采用马歇尔法分别确定黑色石灰岩精品机制砂、白色石灰岩普通机制砂、辉绿岩石屑的GAC-13最佳油石比,并检验其路用性能、抗滑性能与力学性能。按设计空隙率4.2%、最佳油石比下GAC-13的辉绿岩石屑、白色石灰岩普通机制砂、黑色石灰岩精品机制砂的用量分别为30%、25%、23%,动稳定度相应为2053、2326、2416次/mm,冻融劈裂抗拉强度比为78.6%、95.4%、90.4%,构造深度为0.75、0.93、0.99 mm。相对辉绿岩石屑沥青混合料,白色石灰岩普通机制砂、黑色石灰岩精品机制砂沥青混合料高温稳定性提高13.3%、17.6%,相比白色石灰岩普通机制砂,辉绿岩石屑、黑色石灰岩精品机制砂沥青混合料冻融劈裂抗拉强度比降低17.6%、5.2%;40、50℃时黑色石灰岩精品机制砂GAC-13的内摩擦角最大。试验结果表明,抗滑表层GAC-13的细集料组成设计宜优选精品机制砂。

In order to study the influence of fine aggregate material and specification on the composition design and performance of anti sliding surface asphalt mixture GAC-13.Marshall method was used to determine the best oil aggregate ratio of GAC-13 of black limestone fine manufactured sand,white limestone ordinary manufactured sand and diabase stone chips,and their road performance,skid resistance and mechanical properties were tested respectively.According to the design porosity of 4.2%and the optimum oil aggregate ratio,the dosage of gabbro debris,white limestone ordinary manufactured sand and black limestone fine manufactured sand of GAC-13 were 30%,25%and 23%respectively,the dynamic stability were 2053,2326 and 2416 times per mm,the freeze-thaw splitting tensile strength ratio were 78.6%,95.4%and 90.4%,and the structural depth were 0.75,0.93 and 0.99 mm.Compared with the diabase stone chips asphalt mixture,the high temperature stability of the white limestone ordinary machine-made sand and the black limestone fine machine-made sand asphalt mixture increased by 13.3%and 17.6%,and the freeze-thaw splitting tensile strength ratio of the diabase stone chips and the black limestone fine machine-made sand asphalt mixture decreased by 17.6%and 5.2%compared with the white limestone ordinary machine-made sand.The internal friction angle of GAC-13 were the largest at 40℃and 50℃.The results show that,the fine aggregate composition design of anti sliding surface GAC-13 should select the best machine-made sand.