残留含水率对冷拌乳化沥青混合料路用性能的影响分析

Effect of Residual Moisture Content on Cold Mix Emulsified Asphalt Mixture Road Performance

冷拌乳化沥青混合料作为一种新型路面材料,相比于传统热拌、温拌沥青混合料,具有低能源消耗、低污染排放、施工便捷等优点。但是,研究发现,由于乳化沥青中含有水且冷拌乳化沥青混合料拌和的过程中需要加入外掺水,其在养生后会残留一部分水。论文从残留含水率的角度研究其对冷拌乳化沥青混合料路用性能的影响,包括残留水对冷拌冷铺乳化沥青混合料的高温稳定性、水稳定性、低温稳定性及疲劳性能的影响。结果表明,在一定残留含水率范围内,随着残留含水率的下降,其高温、低温及抗水损害路用性能提升幅度较为明显,当残留含水率减小到某一数值后其路用性能趋于稳定,单应变和二级应变组合作用下冷拌料的疲劳寿命均随残留含水率的降低而大幅提高。相关研究结论对于冷拌冷铺施工具有参考价值。

As a new type of material,cold-mix emulsified asphalt mixture has the advantages of low en-ergy consumption,low pollution emission,and convenient construction compared with traditional hot-mix and warm-mix asphalt mixtures.However,through research on cold-mix emulsified asphalt mixtures,it is found that because the emulsified asphalt contains water and the cold-mix emulsified asphalt mixture requires additional water during the mixing process,some water will remain after curing.This paper studies the effect of residual water content on the road performance of cold-mix emulsified asphalt mixture.The main research content includes the residual water on the high-temperature stability,water stability,low-temperature sta-bility and fatigue performance of cold-mix cold-laid emulsified asphalt mixture.The results show that within a certain range of residual moisture content,as the residual moisture content decreases,the road performance of high temperature,low temperature and water damage resistance increases significantly.When the residual moisture content decreases to a certain value,its road performance tends to be stable,and the fatigue life per-formance of cold mix under the combined action of single strain and secondary strain is greatly improved with the decrease of residual moisture content.Relevant research conclusions have reference value for cold-mix cold paving construction.