为提高聚氨酯(PU)混合料在路面工程中的使用寿命,以聚醚多元醇(PPG1000)和改性二苯基甲烷二异氰酸酯(MM-103C)为主要原料,制备了不同异氰酸酯基(NCO)质量分数的PU胶黏剂,并与AC-13级配骨料拌和得到PU混合料。通过黏度、表干时间测试,研究了PU胶黏剂的工艺性能;通过马歇尔稳定度、劈裂强度和肯塔堡飞散测试,研究了PU混合料抗水损害性能。结果表明,25℃时PU胶黏剂表干时间小于30 min,PU混合料固化速度快;浸水马歇尔稳定度与标准马歇尔稳定度均高于28 kN;随着NCO质量分数的增加,冻融劈裂强度比先增加后减低,最高为94.1%;肯塔堡飞散损失率随NCO质量分数的增加呈现先降低后增加的趋势,标准飞散及浸水飞散损失率都小于13%,两者相差的最大值与最小值分别为6.09%和0.7%。

In order to improve the service life of polyurethane mixture in pavement engineering,polyurethane binders with different contents of isocyanate group (NCO) are prepared with polyether polyol (PPG1000) and modified diphenylmethane diisocyanate (MM-103C) as main raw materials,and mixed with AC-13 graded aggregate to obtain polyurethane mixture.The process performance of polyurethane binder is studied through viscosity and tack-free time testing.The water damage resistance of polyurethane mixture is evaluated through Marshall stability,splitting strength and Cantabro dispersion testing.It is found that the tack-free time of polyurethane binder is less than 30 minutes at 25℃.Polyurethane mixture cures fast,and both its immersed Marshall stability and standard Marshall stability are higher than 28 kN.With the increasing NCO content in polyurethane mixture,the ratio of splitting strength before and after freeze-thaw increases firstly and decreases then,with the maximum value at 94.1%.While Cantabro loss of polyurethane mixture decreases firstly and increases then with the increasing NCO content.Both the standard and immersion Cantabro loss are less than 13%,and the maximum and minimum differences between the standard and immersion Cantabro loss are 6.09% and 0.7%,respectively.

田新伟(1998-),男,硕士研究生,研究方向为聚氨酯材料,2317755897@qq.com。