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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 theory of surface free energy, the contact angles of different asphalt, aggregates and known reagents were measured by the contact angle measuring instrument. The adhesion work and peeling work of different asphalt-aggregate systems were calculated and compared by the correlation formula. Aggregate system adhesion properties; Gray correlation entropy analysis of the various factors to determine the impact of various factors on the asphalt - aggregate system adhesion. The results show that different asphalt-aggregate systems have different adhesion work and peel work, that is, have different water stability. In the raw materials, the greater the viscosity of the asphalt, the better the adhesion to the aggregate; while the aggregate shows a pH The larger the value, the better adhesion to the asphalt. Among the external environmental factors, the greater the deicing salt concentration, the more the freeze-thaw cycles, the more severe the aging and the poorer the adhesion of asphalt-aggregate. Gray correlation entropy analysis shows that among the factors that affect the adhesion of asphalt and aggregate, the order of their influence degree is descending order of aggregate type, bitumen type, salt concentration, number of freeze-thaw cycles, and aging rate. Therefore, in road engineering, not only the mix design should be carried out rationally to control the porosity strictly, but also the pitch with higher viscosity and the aggregate with larger pH should be selected. In addition, the dosage of deicing salt should be strictly controlled.