基于表面自由能理论的温拌再生沥青-集料粘附特性

Warm mix recycled asphalt-aggregates adhesion based on surface free energy theory

根据表面能理论,通过表面张力分析仪测试不同掺量新旧沥青和集料的表面自由能参数,分析温拌再生沥青表面自由能的变化规律以及温拌再生沥青-集料粘附特性。研究结果表明:再生沥青的表面自由能随旧沥青掺量增加而增大;温拌剂的添加改变了沥青的极性分量和Lewis酸碱作用力参数,改善了沥青的表面自由能,增强了沥青与石料的粘附能力;结合温拌条件下石灰岩、花岗岩2种石料粘附功之比以及水稳定性能试验结果,说明温拌剂的添加增强了沥青混合料粘附性能,从而改善再生沥青混合料的水稳定性能。

Based on surface free energy theory, this paper evaluated different dosage old asphalt and aggregate surface free energy, and analyzed the variation of warm mix asphalt surface free en- eray and the adhesion properties of warm mix recycled asphalt-aggregate. The results show that. recycled asphalt surface free energy increases with the increase of dosage of old asphalt; the addi- tion of temperature change agent changes asphalt polar component and Lewis acid-base interaction parameter, improves asphalt surface free energy, and enhances the adhesion of asphalt and stone. Combined with adhesion ratio of the stone work between limestone and granite under the condi- tion of warm mix and results of water stability test, it＇s indicated that the addition of warm mix agent enhances adhesion properties of asphalt mixture, thereby improves the recycled asphalt mixture water stability. 7 tabs, 4 figs, 22 refs.