水性环氧乳化沥青固化-破乳速率调控效能及作用机理

Regulation Efficiency and Mechanism of Curing-Demulsification Rate of Waterborne Epoxy Emulsified Asphalt

为研究水性环氧乳化沥青固化-破乳时间及固化产物粘结性能,采用拉拔试验和红外光谱试验,在10℃、25℃及40℃试验温度下,通过掺加促进剂调整水性环氧固化速率,分别测定水性环氧固化时间和乳化沥青完全破乳时间,研究温度、促进剂掺量、固化-破乳时间差对水性环氧乳化沥青粘结强度的影响,分析促进剂作用下水性环氧乳化沥青的红外吸收性质。结果表明,水性环氧树脂固化与乳化沥青破乳时间受温度影响显著,10℃、25℃和40℃水性环氧乳化沥青固化-破乳时间差分别为48 h、8 h及6 h,掺加促进剂可使时间差分别最大缩短42 h、10 h及8 h,实现水性环氧乳化沥青固化-破乳速率调控;各温度下水性环氧乳化沥青达到最大固化强度的固化-破乳时间差分别为36 h、2.5 h和2 h;将促进剂分别掺入水性环氧树脂和水性环氧乳化沥青中,均未产生新的红外特征峰,与未掺加促进剂的水性环氧树脂相比,相同养生时间下其固化程度更高,说明促进剂可有效加速环氧树脂固化反应。本研究可为水性环氧乳化沥青材料优化与施工控制提供参考。

In order to study the curing-demulsification time of waterborne epoxy emulsified asphalt and the bonding performance of cured products, the curing rate of waterborne epoxy was adjusted by adding accelerators at the test temperature of 10 ℃, 25 ℃ and 40 ℃, and the curing time of waterborne epoxy and the complete demulsification time of the emulsified asphalt were measured by pullng test respectively to study the effects of temperature, accelerator dosage, curing-demulsification time difference on the bonding strength of waterborne epoxy emulsified asphalt. In addition, the infrared absorption properties of the waterborne epoxy emulsified asphalt with accelerator were also analyzed. The results show that the curing time of waterborne epoxy resin and the emulsified asphalt is significantly affected by temperature. The curing-demulsification time diffe-rence of the waterborne epoxy emulsified asphalt is 48 h, 8 h and 6 h at 10 ℃, 25 ℃ and 40 ℃, respectively, and the addition of accelerator can shorten the time difference by 42 h, 10 h and 8 h respectively, to realize the curing-demulsification rate control of the waterborne epoxy emulsified asphalt;the curing-demulsification time of waterborne epoxy emulsified asphalt is 36 h, 2.5 h and 2 h at each temperature. The curing-demulsification time difference of the waterborne epoxy emulsified asphalt at above temperatures to reach the maximum curing strength is 36 h, 2.5 h and 2 h respectively. No new infrared characteristic peak was produced when the accelerator was added into the waterborne epoxy resin and the waterborne epoxy emulsified asphalt. Compared with the waterborne epoxy resin without accelerator, its curing degree is higher after the same curing time, indicating that accelerator can effectively accelerate the epoxy resin curing reaction. The study provides a reference for material optimization and construction control of the waterborne epoxy emulsified asphalt.