基于灰熵分析法研究沥青-集料的黏附性能

Adhesion performance of asphalt-aggregate based on the grey relational analysis

基于表面自由能理论,利用接触角测量仪测定不同沥青、集料与已知试剂的接触角,通过相关公式计算并对比不同沥青-集料系统的黏附功和剥落功,研究不同因素对沥青-集料系统黏附性能的影响;对各影响因素进行灰关联熵分析,以确定各因素对沥青-集料系统黏附性能的影响程度。结果表明:不同沥青-集料系统具有不同的黏附功和剥落功,即具有不同的水稳定性;原材料中,沥青黏度越大,与集料的黏附性越好;而集料则表现为pH值越大,与沥青黏附性越好。外界环境影响因素中,除冰盐浓度越大、冻融循环次数越多、老化越严重,沥青-集料的黏附性越差。灰关联熵分析结果表明,影响沥青与集料黏附性的因素中,按其影响程度强弱从大到小排序为集料种类>沥青种类>盐浓度>冻融循环次数>老化水平。因此,在道路工程中不仅要合理进行配合比设计以严格控制空隙率,还应选择黏度较大的沥青和pH值较大的集料,此外应严格控制除冰盐的用量。

Based on the surface free energy theory,the contact angel between asphalt,aggregate and known reagent was measurd using the contact angel measurement instrument,the adhesion and spalling work of different asphalt-aggregate systems according to relative formulas were calculated,then the adhesion work and spalling work of different asphalt-aggregate systems were compared to study the influence of different factors to asphalt-aggregate systems adhesion performance.In order to understand the influence degree of different factors to asphalt-aggregate systems adhesion performance,the grey relational analysis was conducted.The study results show that the adhesion work and spalling work are different between different asphalt-aggregate systems,in other words,the water stability is different.For the raw materials,adhesion performance is better with the increase of viscosity of asphalt and the pH of aggregate.As for the external environment influence factors,adhesion performance is worse with the increase of salt concentration and freezing-thaw cycle times,and the serious of aging level.The grey relational analysis results show that the rank from strong to weak of the influence degree in 5influence factors is types of aggregatetypes of asphalt salt concentrationfreezing-thaw cycle times aging level.So,in road engineering,the mixture ratio design should seriously control,the asphalt with bigger viscosity and the aggregate with bigger pH should be selected,and the dosage of deicing salt should be controlled seriously.