高渗高黏环氧乳化沥青雾封层调配及性能研究

Study on Preparation and Performance of High-Permeability and High-Viscosity Epoxy Emulsified Asphalt Fog Seal

摘要:

研究了乳化沥青、水性环氧树脂、固化剂等材料掺量对环氧乳化沥青渗透性、黏结强度、水稳定性和抗老化性能的影响，调配出一种高渗高黏的雾封层材料，并从微观角度揭示了环氧乳化沥青强度形成机理。结果表明，各组成材料中乳化沥青是黏结强度、水稳定性和抗老化性能的主要影响因素，水性环氧树脂与固化剂的掺配比例是黏结强度的次要影响因素，固化剂是渗透性的主要影响因素；综合性能最佳情况下，调配出的高渗高黏雾封层材料中乳化沥青占比80%、环氧树脂占比20%（水性环氧树脂：固化剂=2∶1）；微观角度发现，调配好的环氧乳化沥青具有三维网状结构、表面疏水、接触角较大等特性；对比于传统雾封层材料，其初始热失重温度显著高于老化温度，这表明环氧树脂材料的加入可不同程度提升雾封层渗透性、黏结强度、耐老化等性能。

Abstract:

The influence of the contents of emulsified asphalt, waterborne epoxy resin, curing agent and other materials on the permeability, bonding strength, water stability and anti-aging performance of epoxy emulsified asphalt is studied. A high-permeability and high-viscosity fog seal material is prepared, and the strength formation mechanism of epoxy emulsified asphalt is revealed from a microscopic perspective. The results show that the emulsified asphalt among the constituent materials is the main influencing factor on the bond strength, water stability and anti-aging performance. The blending ratio of water-based epoxy resin to curing agent is a secondary influencing factor on bonding strength. And the curing agent is the main influencing factor on the permeability. Under the optimal comprehensive performance, 80% emulsified asphalt and 20% epoxy resin (water-based epoxy resin: curing agent = 2∶1) are used in the prepared high-permeability and high-viscosity fog seal material. From a microscopic perspective, it is found that the prepared epoxy emulsified asphalt has the characteristics such as a three-dimensional network structure, surface hydrophobicity, and a large contact angle. Compared with traditional fog seal materials, its initial thermal weight loss temperature is significantly higher than the aging temperature, which indicates that the addition of epoxy resin material can improve the permeability, bonding strength, aging resistance and other properties of the fog seal to varying degrees.