再生粗骨料对沥青混合料路用性能的影响

发布时间：2018-07-08 18:34

本文选题：再生粗骨料 + 沥青混合料　；参考：《中外公路》2017年02期

【摘要】：道路工程具有多等级、多结构层次的特征,对原材料的质量要求也是随着道路等级的降低和结构深度的增加而逐渐降低的,可以消纳不同种类与质量的建筑垃圾,而且体量巨大,因此必将是建筑垃圾循环利用的主要渠道。在研究再生粗骨料与天然骨料主要技术指标差异的基础上,开展采用天然骨料与不同掺量再生粗骨料AC-20C和ATB-25沥青混合料路用性能及力学特性的比较研究。结果表明:随着再生粗骨料掺量增加,沥青用量增加,但有效沥青用量与沥青膜厚度基本维持不变,掺加60%以内再生粗骨料可显著提高沥青混合料的高温性能。再生粗骨料对混合料的水稳定性具有积极影响,但低温抗裂性降低,劈裂抗拉强度逐渐下降。考虑综合性能,建议再生粗骨料掺量不超过60%。
[Abstract]:Road engineering has the characteristics of multi-grade and multi-structure levels. The quality requirements of raw materials are also gradually reduced with the decrease of road grade and the increase of structural depth, which can absorb construction waste of different kinds and quality. And the volume is huge, so it will be the main channel of recycling construction waste. On the basis of studying the difference of main technical indexes between recycled coarse aggregate and natural aggregate, the road performance and mechanical properties of recycled coarse aggregate AC-20C and ATB-25 asphalt mixture were studied. The results show that the amount of asphalt increases with the increase of recycled coarse aggregate content, but the effective asphalt content and the thickness of asphalt film remain unchanged, and the high temperature performance of asphalt mixture can be improved significantly by adding recycled coarse aggregate within 60%. The recycled coarse aggregate has a positive effect on the water stability of the mixture, but the cracking resistance at low temperature decreases and the tensile strength decreases gradually. Considering the comprehensive properties, it is suggested that the amount of recycled coarse aggregate should not exceed 60%.
【作者单位】：华南理工大学土木与交通学院;北京师范大学数学科学学院;
【基金】：国家科技支撑计划项目(编号:2014BAC07B00,2014BAC07B03)
【分类号】：U414

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