论文部分内容阅读
基于表面自由能理论,首先测定不同沥青、集料与已知试剂的接触角,然后通过相关公式计算得到沥青-集料复合材料的黏附功、剥落功及水稳定性指标ER,并分析老化前后沥青-集料复合材料的黏附性变化。研究结果表明:沥青-集料复合材料的黏附过程和剥落过程均对外放热且自发进行;同种沥青不同集料的复合材料黏附性和抵抗水损害能力排序为沥青-石灰岩>沥青-玄武岩>沥青-花岗岩,不同沥青同种集料复合材料黏附性强弱和抵抗水损害能力排序为复合改性沥青(CM)-集料>胶粉改性沥青(CRM)-集料>苯乙烯-丁二烯-苯乙烯改性沥青(SBSM)-集料复合材料;老化后沥青-集料复合材料的黏附性能和抵抗水损害能力均呈现下降趋势,且压力老化(PAV)比旋转薄膜烘箱老化(RTFOT)更为明显,但老化过程并未改变沥青与集料间的配伍性;对三种改性沥青的SEM图像进行分析,发现老化后沥青与集料界面黏结特性发生变化,导致沥青-集料复合材料黏附能力下降。
Based on the theory of surface free energy, the contact angles of different asphalt, aggregate and known agents were measured first, and then the adhesion work, peeling work and water stability index (ER) of asphalt-aggregate composites were calculated by the correlation formula and analyzed before and after aging Adhesion of asphalt - aggregate composites. The results show that the adhesion and exfoliation processes of asphalt-aggregate composites are both exothermic and spontaneous. The composites adhesion and resistance to water damage of the same aggregate with different aggregates are ranked as asphalt-limestone> asphalt-basalt> Asphalt - Granite, Adhesive strength and resistance to water damage of different bitumen same aggregate composites Sorted as Composite Modified Asphalt (CM) - Aggregate> Crumb Rubber Modified Asphalt (CRM) - Aggregate> Styrene- Butadiene-styrene-modified asphalt (SBSM) -sized aggregate composites; the adhesive properties of asphalt-aggregate composites and the ability to resist water damage all showed a downward trend after aging, and the pressure aging (PAV) RTFOT) was more obvious, but the aging process did not change the compatibility between asphalt and aggregate; SEM images of the three modified asphalt were analyzed and found that the bonding properties of asphalt and aggregate changes after aging, leading to asphalt - Composite materials decreased adhesion.