基于接触角方法沥青与石料粘附特性及路用性能研究

Adhesion Properties of Asphalt-stone and Road Performance Based on Contact Angle Method

沥青-石料粘附失效产生的病害,如松散、脱粒、麻面、坑槽等,致使沥青路面使用性能下降,危及行车安全,基于表面自由能理论的躺滴法作为接触角法中评价沥青-石料粘附性的试验方法,因其操作简单、定量评价、人为误差小等特点,成为了近年来研究评价沥青-石料粘附性的热点。本文采用躺滴法,以西北地区三种品牌沥青与甘肃省七种石料作为研究对象,利用水煮法、躺滴法评价沥青-石料粘附性与AASHTO T283评价沥青混合料水稳定性进行对比分析,结果表明,水煮法定性评价沥青-石料粘附等级、接触角法定量评价沥青-石料粘附功与AASHTO T283评价沥青混合料水稳定性的冻融劈裂强度比(TSR)的决定系数分别为0.1956、0.2731、0.4793,0.8179、0.7173、0.7997,说明接触角法粘附功定量评价沥青-石料粘附性能够较为准确的评价沥青混合料水稳定性;同时三种沥青的粘附能力依次为C>B≥A,七种石料的粘附能力依次为平凉上杨石灰岩>玉石湾蛇纹岩>黑山湖玄武岩>东乐石灰岩>永登玄武岩>出卜拉沟玄武岩>定西花岗岩。

Diseases, such as loose, threshing, pockmarked face, pits, etc. , because of asphalt-stone adhesion failure, can decline the usability of asphalt pavement endanger traffic safety. The surface free energy based on the theory of sessile drop method as the contact angle method in the evaluation of asphalt- stone adhesion test method, because of its simple, quantitative evaluation, small human error and other features, has become a recent research hot spots to evaluate the asphalt-stone adhesive properties. In this paper, sessile drop method as the test method, three brands asphalts in the Northwest Territories and seven kinds of typical stones in Gansu Province as the research object. Water cooking method and sessile drop method assess asphalt-stone adhesion, meanwhile AASHTO T283 method assess water stability of asphalt mixture. The results showed that water cooking method-qualitatively evaluate adhesion levels asphalt-stone, the contact angle method-quantitatively evaluate adhesion work of asphalt-stone, with AASHTO T283-evaluate freeze-thaw splitting strength ratio （TSR） about water stability of asphalt mixture their determine coefficients are 0. 1956,0. 2731,0. 4793,0. 8179,0. 7173,0. 7997, respectively. Therefore, the contact angle method evaluates quantitatively adhesion work of asphalt-stone can be more accurate evaluation on water stability of asphalt mixture; Simultaneously three asphalt adhesion ability order was C 〉 B 〉t A, seven stone adhesion ability on the order of Pingliang Shangyang limestone 〉 Jade Bay serpentinite 〉 Black Lake basalt 〉 Dongle limestone 〉 Yongdeng basalt 〉 Chubolagou basalt 〉 Dingxi granite.