基于灰熵分析法研究沥青-集料的黏附性能

发布时间：2018-11-04 17:22

【摘要】：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。
[Abstract]:Based on the theory of surface free energy, the contact angle of different asphalt, aggregate and known reagents was measured by contact angle measuring instrument. The adhesion and spalling work of different asphalt-aggregate system was calculated and compared by correlation formula. The influence of different factors on the adhesion performance of asphalt aggregate system was studied. In order to determine the degree of influence of each factor on the adhesion performance of asphalt aggregate system, the grey correlation entropy analysis was carried out to determine the influence of each factor on the adhesion performance of asphalt aggregate system. The results show that different asphalt-aggregate systems have different adhesion and spalling work, that is, different water stability, the higher the asphalt viscosity, the better the adhesion to aggregate. The higher the pH value, the better the adhesion between aggregate and asphalt. The higher the concentration of deicing salt, the more the freeze-thaw cycle, the more serious the aging and the worse the adhesion of bitumen to aggregate. The results of grey correlation entropy analysis show that among the factors affecting the adhesion between asphalt and aggregate, the aging level of asphalt type salt concentration freeze-thaw cycle is ranked according to its influence degree from large to small. Therefore, in road engineering, not only should the mix ratio be reasonably designed to strictly control the void ratio, but also asphalt with high viscosity and aggregate with high pH value should be selected, and the amount of deicing salt should be strictly controlled.
【作者单位】：内蒙古工业大学土木工程学院;内蒙古农业大学能源与交通工程学院;
【基金】：国家自然科学基金(11462018) 内蒙古自然科学基金(2014 MS0507)
【分类号】：U414

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