改性乳化沥青混合料胶浆特性及强度分析

Analysis of mortar characteristics and strength of modified emulsified asphalt mixture

为探究改性乳化沥青混合料的性能,设计不同配合比的乳化沥青胶浆,研究不同粉胶比、水泥替代率、养护时间对乳化沥青胶浆黏度特性的影响,分析不同胶浆乳化沥青混合料的初始强度,并测试不同温度、湿度、风力等环境条件下乳化沥青混合料的马歇尔稳定度。研究结果表明:粉胶比越大,水泥替代率越高,乳化沥青胶浆的黏度越大;当粉胶比为1.0且水泥替代率不超过50%时,乳化沥青胶浆的马歇尔初始稳定度为3.32 kN。温度越高,湿度越小,风力越大,越有利于加速乳化沥青破乳,促进乳化沥青混合料强度的形成与发展;随着养护时间的延长,乳化沥青混合料的马歇尔强度增大,该强度发展呈前期增长较快、后续逐渐减缓甚至趋于平稳的规律。

To explore the performance characteristics of modified emulsified asphalt mixture,Emulsified asphalt mortars with different mix ratios were designed.The effects of powder binder ratio,cement replacement rate and curing time on the viscosity characteristics of emulsified asphalt mortar were investigated.The initial strength of different mortar emulsified asphalt mixture was analyzed.And the Marshall stability of emulsified asphalt mixture under different temperature,humidity,wind force and other external environmental conditions was tested.The results show that,the larger the powder binder ratio,the higher the cement replacement rate,and the greater the viscosity of emulsified asphalt mortar.When the powder binder ratio is 1.0,the cement replacement rate should not exceed 50%,the initial Marshall stability is 3.32 kN.The higher the temperature,the smaller the humidity and the stronger the wind force,the more conducive to accelerating the demulsification of emulsified asphalt,and promoting the formation and development of emulsified asphalt mixture strength.With the extension of curing time,the greater the Marshall strength of emulsified asphalt mixture,the faster the strength development in the early stage,and then gradually slow down or even tend to be stable.