液体沥青混合料强度生成规律研究及性能优化  

Research on Strength Generation Law and Performance Optimization of Cutback Asphalt Mixture

作　　者：易军艳[1] 阿卜杜海比尔·阿卜杜喀迪尔 于文 裴忠实 范雷 YI Junyan;ABDUKADIR·Abduhaibir;YU Wen;PEI Zhongshi;FAN Lei(School of Transportation Science and Engineering,Harbin Institute of Technology,Harbin,China,150090;Department of Transportation of Heilongjiang Province,Harbin,China,150009;Yancheng Transportation Bureau,Yancheng,China,224000)

机构地区：[1]哈尔滨工业大学交通科学与工程学院,黑龙江哈尔滨150090 [2]黑龙江省公路事业发展中心,黑龙江哈尔滨150009 [3]盐城市公路事业发展中心,江苏盐城224000

出　　处：《沈阳建筑大学学报（自然科学版）》2023年第2期278-286,共9页Journal of Shenyang Jianzhu University：Natural Science

基　　金：国家自然科学基金项目(52178420)。

摘　　要：目的 探究液体沥青混合料路面的劈裂抗拉强度生成规律与性能优化方法,提高液体沥青混合料路面使用寿命。方法 采用傅里叶红外光谱鉴别110℃养生前后液体沥青官能团变化,确定粘结力形成机理;根据广义时温等效原理,研究两种级配混合料劈裂抗拉强度增长模型;再根据液体沥青混合料特性提出相应的性能评价方法和指标;最后从填料和外掺剂两个角度提出性能优化方案。结果 液体沥青粘结力提升的实质是稀释剂组分挥发的物理过程,Sigmoidal模型较好地反映液体沥青混合料劈裂抗拉强度生成规律;相对于AC级配,LB级配混合料性能更优,但两种级配混合料均存在水稳定性差、初始强度不足的问题,可采用添加水泥和矿粉的质量比为3∶7复合填料和聚合MDI添加量为3%的措施进行性能优化。结论 在添加水泥和聚合MDI后,LB-16级配液体沥青混合料的初始强度和水稳定性均满足使用要求。In order to improve the service life of cutback asphalt mixture pavement,the generation law of its splitting tensile strength and the method of performance optimization were explored.The changes of functional groups of cutback asphalt before and after curing at 110℃were identified by Fourier transform infrared spectroscopy to determine the cohesive force mechanism of asphalt.And based on the generalized time-temperature equivalence principle,the splitting tensile strength growth models of two graded mixtures are studied.According to the characteristics of cutback asphalt mixture,the corresponding performance evaluation methods and indicators are put forward.Finally,the performance optimization scheme is proposed from the two aspects of filler and admixture.The results show that the essence of improving the cohesive force of cutback asphalt is the physical process of the volatilization of diluent components,and the Sigmoidal model can reflect the generation law of the splitting tensile strength of cutback asphalt mixture.In addition,compared with AC gradation,LB gradation has better performance.However,the two graded mixtures have the problems of poor water stability and insufficient initial strength.The performance can be optimized by adding cement:mineral powder=3∶7 composite filler and 3%polymerized MDI.In general,the initial strength and water stability of LB-16 graded liquid asphalt mixture can meet the requirements after adding cement and polymeric MDI.

关 键 词：道路工程 液体沥青混合料 强度生成规律 性能优化 聚合MDI 

分 类 号：TU528.42[建筑科学—建筑技术科学] U414.1[交通运输工程—道路与铁道工程]