不同RAP温度泡沫沥青冷再生混合料性能及影响机理

Study on Performance and Effect Mechanism of foam Asphalt Cold Reclaimed Mixture with Different RAP Temperature

研究了RAP温度对泡沫沥青冷再生混合料干湿劈裂强度、高低温性能和泡沫沥青分散性状的影响。结果表明,随着RAP温度增加,泡沫沥青冷再生混合料干湿劈裂强度增大,混合料最佳泡沫沥青用量减小,RAP温度对泡沫沥青冷再生混合料劈裂强度有显著的影响;增加RAP预热温度可显著改善泡沫沥青冷再生混合料的高温稳定性和低温抗裂性,不同RAP预热温度下,泡沫沥青冷再生混合料马歇尔试件劈裂破坏界面的泡沫沥青面积百分比与试件干湿劈裂强度之间的线性拟合关系良好,RAP预热温度对泡沫沥青冷再生混合料的影响机理在于其影响了泡沫沥青在混合料的分散形状和分散的均匀性,提高了混合料的压实特性。

This article studies the RAP temperature foam asphalt cold recycled mixture of wet and dry splitting strength, high temperature performance and traits of foamed bitumen dispersion. The results showed that： with increasingRAP temperature, foamed bitumen cold recycling mixture of wet and dry splitting intensity increases, the optimal mix foam asphalt content is reduced, RAP temperature of foamed bitumen cold recycling mixture splitting strength have a significant impact, RAP preheating temperature increase could significantly improve foamed bitumen cold recycling mixture of high temperature stability and low temperature cracking resistance, under different RAP preheat temperature, the percentage of foamed bitumen cold mix foam asphalt area of Marshall specimens interface regeneration and splitting fail- ure Good relations specimen linear fit between the wet and dry splitting strength, RAP preheating temper- ature impact mechanism for foamed bitumen cold mix affects reproduction in its foam mix asphalt dispersion shape and uniformity of dispersion, improved compaction characteristics of the mix.