半开级配SBS改性沥青混合料BK-7组成设计  

Composition design of semi-open grade SBS modified asphalt mixture BK-7

作　　者：关宏信[1] 周直霖 覃婉菊 李兵 杨涛 GUAN Hongxin;ZHOU Zhilin;QIN Wanju;LI Bing;YANG Tao(School of Traffic and Transportation Engineering,Changsha University of Science&Technology,Changsha 410114,China;Guangxi Zhuang Autonomous Region Highway Development Center,Nanning 530029,China;Foshan Highway&Bridge Construction Co.,Ltd.,Foshan 528042,China;HNCEG Communications Construction Co.,Ltd.,Changsha 410004,China)

机构地区：[1]长沙理工大学交通运输工程学院,湖南长沙410114 [2]广西壮族自治区公路发展中心,广西南宁530029 [3]佛山市路桥建设有限公司,广东佛山528042 [4]湖南建工交通建设有限公司,湖南长沙410004

出　　处：《长沙理工大学学报（自然科学版）》2023年第6期91-99,共9页Journal of Changsha University of Science and Technology:Natural Science

基　　金：国家自然科学基金资助项目(52078062);湖南省自然科学基金项目(2020JJ4604);湖南省交通运输地方标准制修订项目(B201806)。

摘　　要：【目的】论证公称最大粒径为7 mm的半开级配沥青混合料BK-7的路用性能。【方法】对BK-7混合料的矿料组成进行了设计,并在其纤维掺量为0.4%的情况下,通过谢伦堡析漏和肯塔堡飞散试验确定了SBS改性沥青的用量。同时,对9%、11%、13%三种空隙率的BK-7混合料进行了单轴贯入试验、低温弯曲试验以及浸水马歇尔稳定度试验,并将其与SMA-5、AC-5、OGFC-5沥青混合料的性能进行比较。此外,还对经过酸性溶液浸泡过的空隙率为11%的BK-7混合料进行了飞散和马歇尔试验。【结果】空隙率为9%的BK-7混合料路用性能最好,抗车辙性能最优,且低温抗裂性能和水稳定性能与SMA-5、AC-5沥青混合料的相当;空隙率为11%的BK-7混合料在pH=4的酸雨溶液中浸泡两个周期(“浸泡7 d、自然干燥1 d”为一个周期)后,其马歇尔稳定度与肯塔堡飞散损失仍能满足相应的规范要求。【结论】掺纤维且采用SBS改性沥青的空隙率为9%的BK-7沥青混合料的路用性能具有比较优势,在温度较高的华南地区有一定的工程应用价值。[Purposes]This work aims to demonstrate the semi-open graded asphalt mixture BK-7 with a nominal maximum particle size of 7 mm.[Methods]In this paper,the mineral composition formulation of BK-7 mixture was designed.The amount of SBS modified asphalt was determined by Schellenberg leakage test and Kantabaugh flying test when the fiber content was 0.4%.Uniaxial penetration test,low temperature bending test and Marshall stability test of BK-7 mixture with 9%,11%and 13%porosity were carried out,and the corresponding properties of BK-7 mixture were compared with those of SMA-5,AC-5 and OGFC-5.At the same time,flying and Marshall tests were carried out on BK-7 mixture with 11%porosity soaked in acid solution.[Findings]Among the three kinds of BK-7 mixture,the BK-7 mixture with 9%porosity has the best road performance and the best rutting resistance,and its low temperature crack resistance and water stability are comparable to those of SMA-5 and AC-5 asphalt mixture.After soaking in acid rain solution with pH=4 for 2 cycles("Soaking for 7 days,natural drying for 1 day"for 1 cycle),the Marshall stability of BK-7 mixture with 11%porosity and the flight loss of Fort Kenta could meet the corresponding specification requirements.[Conclusions]The road performance of BK-7 asphalt mixture with 9%porosity of SBS modified asphalt mixed with fiber has comparative advantages,and it has certain engineering application value in South China where exhibits a high-temperature climate throughout a year.

关 键 词：道路工程 SBS改性沥青 纤维 半开级配 路用性能 

分 类 号：U416[交通运输工程—道路与铁道工程]