GMA浇筑式沥青混合料的制备及性能

以特立尼达湖沥青（TLA）和A-70# 基质沥青配制了复合沥青，并将其与集料拌和得到浇筑式沥青混合料（GMA），重点研究了沥青胶结料和拌和时间对GMA混合料性能的影响。结果表明:随着沥青胶结料中TLA质量分数的增加，沥青胶结料的热温度敏感性降低，混合料性的流动性变差、硬度变大，TLA最佳的质量分数为70%；混合料拌和时间的延长，沥青胶结料的老化程度增大，混合料的高温性能、流动性变好，但冲击韧性（抗疲劳性）降低，最佳的拌和时间为1.5~3.5 h。

Preparation and Properties of Pouring Guss Mastic Asphalt Mixture

Asphalt composite was prepared from Trinidad lake asphalt （TLA），A-70# asphalt，and aggregates to obtain pouring asphalt composite. Effects of asphalt binder and mixing time on properties of pouring asphalt composite were investigated. The results show that the increase of mass fraction of TLA has caused negative effects such as temperature insensitivity of the asphalt binder，worse fluidity and hardness of the mixture. It is found that the optimum mass fraction of TLA is 70%. With extending mixing time，the aging degree of the asphalt binder increases，both the high temperature performance and fluidity of the mixture improve，while its impact toughness （i.e.，the resistance fatigue performance） decreases. The optimum mixing time of mixture is between 1.5 and 3.5 h.