Abstract: In order to improve construction efficiency and high-temperature stability of pouring asphalt mixture, MA-10 were mixed with GA-10 process, on the basis of the comparative analysis of the characteristics of MA-10 and GA-10. Firstly, two kinds of technical index evaluation systems were used for indoor test and analysis. Secondly, the addition of Sasobit modifier, the change of 0.075 mm mesh passing percent of mineral aggregate gradation and different kinds and amounts of asphalt cement were used for proportioning and testing, and the influence of these three factors on the road performance of MA-10 mixture was analyzed. Finally, the accelerated loading test was carried out at 60 ℃ to check its high-temperature stability. Research results show that: when MA-10 is mixed with GA-10 process, the penetration and hardness of the mixture decreases by 60%, but the penetration increment is about 20% of the penetration, which is about 2 times of GA-10 mixture; when 3% Sasobit modifier is added, the penetration and its increment of MA-10 decreases by 27% and 54% respectively; when 0.075 mm mesh passing percent of mineral aggregate gradation is reduced, the high-temperature stability can be improved, but the paving fluidity is obviously influenced. Changing asphalt type and content is difficult to make high-temperature stability and paving fluidity of the mixture meet technical requirement simultaneously. In the accelerated loading test at 60 ℃, the rutting depth of MA-10 decreases by 50%. It is concluded that mixing MA-10 with GA-10 process and being assisted by Sasobit modifier, can not only improve high-temperature stability of MA-10 greatly, but also shorten the construction period by more than 60%.

Key words: bridge engineering, pouring asphalt mixture, production process, road performance, high-temperature stability, MA-10, GA-10

摘要： 为提高浇注式沥青混合料生产效率和高温稳定性，在对MA-10和GA-10两种类型浇注式沥青混合料特点对比分析的基础上，以GA-10工艺拌制MA-10混合料。首先，分别采用两类技术指标评价体系进行室内试验和分析。其次，添加Sasobit改性剂、变动矿料级配0.075 mm通过率和使用不同种类及用量的沥青胶结料进行配比和试验，分析这3种因素对MA-10混合料路用性能的影响。最后，在60 ℃条件下进行加速加载试验，检验MA-10混合料的高温稳定性。研究结果表明：以GA-10工艺拌制MA-10时，混合料的贯入度和硬度降低了60%，但是贯入度增量约为贯入度的20%，是GA-10混合料的2倍左右；添加3%Sasobit改性剂时，MA-10的贯入度及其增量分别降低了27%和54%；降低矿料级配0.075 mm筛孔通过率会提高高温稳定性，但也明显影响摊铺流动性；改变沥青种类和含量难以使混合料的高温稳定性和摊铺流动性同时满足技术要求；60 ℃加速加载试验中，MA-10混合料辙槽深度降低了50%。研究结果说明，以GA-10工艺生产MA-10混合料，并辅以Sasobit改性剂，不但能大幅提高MA-10混合料的高温稳定性，还能够缩短施工周期60%以上。

关键词: 桥梁工程, 浇注式沥青混合料, 生产工艺, 路用性能, 高温稳定性, MA-10, GA-10