填料对水性环氧乳化沥青胶浆高温性能的影响

doi:10.3969/j.issn.1674-0696.2023.09.06

摘要/Abstract

摘要： 为研究填料种类和粉胶比对水性环氧乳化沥青胶浆高温性能的影响，通过拉拔试验和动态剪切流变试验(DSR)确定了水性环氧树脂体系在改性乳化沥青中的合理掺量，并制备了不同填料种类和粉胶比的水性环氧乳化沥青胶浆。采用温度扫描、多应力下重复蠕变模式分析了沥青胶浆的复数模量(G*)、相位角(δ)、车辙因子(G*/sinδ)、不可恢复蠕变柔量(Jnr)和蠕变柔量差值变化率(Jnr-diff)的变化规律；使用扫描电镜(SEM)对水性环氧乳化沥青和2种胶浆的微观结构进行观测，分析了沥青胶浆的高温流变特性及原理。研究结果表明：改性乳化沥青中水性环氧树脂体系的合理掺量为20%；水泥-水性环氧乳化沥青胶浆在不同温度和剪切应力作用下较矿粉-水性环氧乳化沥青胶浆具有更好的高温抗变形能力；2种胶浆的Jnr与粉胶比表现出极好的相关性，且矿粉胶浆对粉胶比的敏感性更高；增大粉胶比均能提升这2种胶浆的高温性能，矿粉胶浆的粉胶比从0.3增至1.2的过程中高温稳定性持续提升，水泥胶浆的高温稳定性在粉胶比为0.9~1.2时存在极值；矿粉在沥青胶浆中表现出模量增强效应，水泥水化产物与沥青、水性环氧树脂固化产物在胶浆中形成致密结构。

关键词: 道路工程；水性环氧乳化沥青；高温性能；粉胶比；填料

Abstract: To study the effects of fillers and the powder to glue ratio on the high temperature performance of waterborne epoxy emulsified asphalt, and the waterborne epoxy resin system in modified emulsified asphalt, and different fillers and powder to glue ratios of waterborne epoxy emulsified asphalt slurries with drawing test and dynamic shear rheological test (DSR) were used to determine the optimal dosage were prepared. The variation rules of complex modulus (G*), phase angle (δ), rutting factor (G*/sinδ), non-recoverable creep compliance (Jnr) and creep compliance difference rate (Jnr-diff) of asphalt mortar were analyzed by temperature scanning and the repeated creep mode under multiple stresses. And the microstructure of waterborne epoxy emulsified asphalt and two mortars were tested by scanning electron microscope (SEM) in order to study the high temperature rheological properties and principles of asphalt mortar. The research results show that the reasonable content of waterborne epoxy resin system in modified emulsified asphalt is 20%. Cement-waterborne epoxy emulsified asphalt mortar has better high-temperature deformation resistance than mineral powder-waterborne epoxy emulsified asphalt mortar under different temperatures and shear stresses. Jnr of the two types of mortars shows excellent correlation with the powder to glue ratio, and the sensitivity of mineral powder slurry to the powder to glue ratio is higher. Increasing the powder to glue ratio can improve the high-temperature performance of the two mortars. During the process of increasing the powder to glue ratio of mineral powder mortar from 0.3 to 1.2, the high-temperature stability continues to improve. The high-temperature stability of cement mortar has an extreme value when the powder to glue ratio is between 0.9 and 1.2. Mineral powder shows modulus enhancement effect in asphalt mortar. The cement hydration products form a dense structure in the slurry with the curing products of asphalt and water epoxy resin.

Key words: highway engineering; waterborne epoxy emulsified asphalt; high temperature performance; powder to glue ratio; filler

中图分类号:

U414

黄维蓉1，熊柯霖1，李怀龙2，王娇3. 填料对水性环氧乳化沥青胶浆高温性能的影响[J]. 重庆交通大学学报（自然科学版）, 2023, 42(9): 42-49.

HUANG Weirong1, XIONG Kelin1, LI Huailong2, WANG Jiao3. Effect of Fillers on High Temperature Performance of Waterborne Epoxy Emulsified Asphalt Mortar[J]. Journal of Chongqing Jiaotong University(Natural Science), 2023, 42(9): 42-49.

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