辽宁省公路沥青结合料低温性能设计参数研究  

Study of the Design Parameters of Low Temperature Performance of Highway Asphalt in Liaoning Province

作　　者：张敏江 韩梦迪 ZHANG Minjiang;HAN Mengdi(School of Transportation Engineering,Shenyang Jianzhu University,Shenyang,China,110168)

机构地区：[1]沈阳建筑大学交通工程学院,辽宁沈阳110168

出　　处：《沈阳建筑大学学报（自然科学版）》2018年第5期873-880,共8页Journal of Shenyang Jianzhu University：Natural Science

基　　金：国家自然科学基金项目(51178278);辽宁省交通厅科技项目(201512)

摘　　要：目的根据现行规范中给出的低温开裂预估模型,通过控制沥青结合料设计参数来控制沥青路面的低温开裂.方法根据辽宁省各地温度和湿度分布情况,利用K-均值聚类算法对辽宁省进行了路面使用性能气候分区,并依据现行规范中提出的沥青路面低温开裂模型,对五个气候分区的公路沥青混合料所需沥青的蠕变劲度进行研究.结果五个分区当中按照平均沥青蠕变劲度模量由小到大的顺序为Ⅱ区、Ⅰ区、Ⅳ区、Ⅲ区、Ⅴ区;温度变量对沥青路面低温开裂影响较大,平均每减少1℃,沥青蠕变劲度减少44. 97 MPa;公路等级越高,沥青的蠕变劲度就越低;路基土对沥青低温性能要求从高至低排序为砂土、粉质黏土、黏土.结论在季节性冻土地区公路沥青路面设计中,选择沥青蠕变劲度满足当地气候、土基类型及路面等级设计要求的沥青结合料可有效地控制沥青路面低温开裂.According to the low-temperature cracking prediction model given in the current specification,the asphalt pavement cold cracking was controlled by controlling the design parameters of the asphalt binder.According to the distribution of temperature and humidity in Liaoning Province,the K-means clustering algorithm was used to partition the pavement performance and climate in Liaoning province,based on the low temperature cracking model of asphalt pavement proposed in the current specification,the creep stiffness of asphalt mixture in five climatic zones of Liaoning province was studied.In the five zones,the order of the average creep modulus of asphalt creep from small to large is Zone II,Zone I,Zone IV,Zone III,Zone V;the temperature variation has a great influence on the low temperature cracking of asphalt pavement.For every 1℃decrease,the creep stiffness of asphalt decreases by 44.97 MPa.The higher the highway grade,the lower the creep stiffness of the asphalt;Subgrade soil sorts asphalt cold,silty clay,and clay from low to high.In the design of highway asphalt pavement in seasonal frozen soil areas,the asphalt binder with the creep strength of asphalt meeting the local climate,soil type and pavement grade design requirements can effectively control the low temperature cracking of asphalt pavement.

关 键 词：沥青路面 低温开裂 蠕变劲度 路面使用性能 土基类型 

分 类 号：TU366.3[建筑科学—结构工程]