厂拌热再生沥青混合料低温抗裂与水稳定性研究

发布时间：2018-04-14 18:27

本文选题：道路工程 + 厂拌热再生　；参考：《重庆交通大学学报(自然科学版)》2017年04期

【摘要】：基于室内试验测定了回收沥青面层材料中旧沥青、旧集料,新加沥青、新加集料及再生剂的各项性能指标;通过马歇尔试验确定了不同类型再生沥青混合料(AC-16C和AC-13)的最佳沥青用量。通过低温小梁弯曲试验和冻融劈裂试验,分析了不同旧料掺配比例、不同旧料类型、是否添加再生剂及二次老化前后混合料的低温抗裂性与水稳定性。结果表明:再生沥青混合料随旧料掺配比例的增加低温性能逐渐变差;短期水损害对其稳定性影响不大,但抵抗长期水损破坏的能力却大幅下降;旧料类型对再生沥青混合料性能的影响关联不大;添加7%~9%掺量的再生剂对其低温抗裂与水稳定性能的改善效果优于10%掺配比的再生混合料,基本接近新拌沥青混合料;二次老化后再生沥青混合料低温抗裂性能下降较快,虽仍可抵御短期水损害,但对其长期水稳定性影响较大,建议添加一定比例的再生剂。AC-13型再生沥青混合料抵抗低温开裂与水损破坏的能力相比于AC-16C型级配更强,更适合做上面层。
[Abstract]:Based on laboratory tests, the performance indexes of old asphalt, old aggregate, new asphalt, new aggregate and regenerating agent in asphalt surface material were measured.The optimum asphalt content of different recycled asphalt mixtures (AC-16C and AC-13) was determined by Marshall test.By means of low temperature trabecular bending test and freeze-thaw splitting test, the low temperature crack resistance and water stability of the mixture before and after secondary aging were analyzed.The results show that the low temperature performance of recycled asphalt mixture becomes worse with the increase of the proportion of used asphalt, the short-term water damage has little effect on its stability, but the ability to resist the long-term water loss damage is greatly reduced.The influence of the old material type on the performance of recycled asphalt mixture is not significant, and the improvement of low temperature crack resistance and water stability of recycled asphalt mixture by adding 7% and 9% recycled agent is better than that of recycled mixture with 10% mixture ratio, which is close to that of fresh asphalt mixture.After secondary aging, the low temperature cracking resistance of recycled asphalt mixture decreases rapidly, although it can still resist short-term water damage, but it has a great influence on its long-term water stability.It is suggested that the ability of adding a certain proportion of recycled asphalt mixture. AC-13 to resist low temperature cracking and water loss failure is stronger than that of AC-16C type and is more suitable for upper layer.
【作者单位】：重庆交通大学土木工程学院;重庆交通大学材料科学与工程学院;贵州融达公路桥梁工程有限责任公司;重庆重交沥青砼股份有限公司;
【基金】：重庆市科技攻关项目(cstc2012gg A50001)
【分类号】：U414

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