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

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