基于GTM的温拌再生沥青混合料压实特性

基于温拌再生技术,利用GTM设计法对沥青混合料的级配进行设计并确定拌和与压实温度,研究温拌再生沥青混合料压实特性随压实温度和旧料掺配比例变化规律,分析不同温度(100℃、110℃、120℃、130℃、140℃)、不同旧料掺量比例(0%、20%、30%、40%、50%)下温拌再生沥青混合料体积参数的变化规律。结果表明,温拌再生沥青混合料的空隙率随压实温度的提高而减小,沥青混合料的沥青饱和度、旋转剪切系数GSF、旋转稳定值GSI随着压实温度的升高而增加;压实温度一定时,温拌再生沥青混合料的空隙率随旧料掺量的增加而增大,沥青混合料的沥青饱和度、旋转剪切系数、旋转稳定值随着旧料掺量的增加而减小;旧料掺量在40%以下、压实温度在100℃~140℃范围,温拌再生沥青混合料的体积指标均满足要求。

Compaction Characteristics of Warm Mixed Recycled Asphalt Mixture based on GTM

Being based on warm-mixing and recycling technology,asphalt mixture gradation has been designed and the temperature of mixing and compaction has been settled,to research the changing rule of warm recycled asphalt mixture compaction characteristics following with compaction temperature and old material blending ratio changes,and changing rule of volume parameters of warm mix asphalt mixture have been analyzed under different temperature (100 C,110 C,120 C,130 C and 140 C) and the different proportion of old material content (0,20%,30%,40%,50%).The results have shown that the void fraction of warm recycled asphalt mixture decreases with compaction temperature increasing,but asphalt saturation,asphalt mixture rotary shear coefficient GSF,shear coefficient GSI increase as the compaction temperature is increased;If the compaction temperature is certain,the void of warm mix asphalt mixture will increase with the increased content of the old material,while asphalt saturation,asphalt mixture shear coefficient GSF and shear coefficient GSI decrease;when old material content is in the range of 40%,under the compaction temperature range of 100~140 ℃,the volume parameters of asphalt mixture could meet the requirements.