泡沫沥青冷再生混合料物理力学性能研究

Study on Physical Mechanics Performance of Bubble Asphalt Cold Recycling Mixture

泡沫沥青冷再生混合料受到人们越来越广泛的关注,但对其相关性能的研究并不完善。通过工程实践及大量室内试验,该文分析了集料级配、沥青用量对泡沫沥青冷再生混合料的密度、空隙率、抗拉性能、水稳性、高温稳定性及抗剪强度的影响。研究表明,随着沥青用量的增加,泡沫沥青冷再生混合料的密度、稳定度、抗剪强度呈下降趋势,水稳性呈上升趋势,而空隙率则变化不大;混合料的干、湿劈裂强度则随着沥青用量的变化先增加后降低;级配B混合料的密度、高温稳定性、抗剪强度及干、湿劈裂强度均高于级配A混合料。这说明级配是决定冷再生混合料各种性能的最关键因素。

The bubble asphalt cold recycling mixture becomes the focus of more and more attention,but the study of its relative performances is not perfect.According to the engineering practices and mass indoor experiments,the article analyzes the influence of the aggregate gradation and asphalt dosage on the density,voidage,tensile property,water stability,high-temperature stability and shearing strength of the bubble asphalt cold recycling mixture.The study makes clear that the density,stability and shearing strength present the downtrend,the water stability presents the rise tendency,and the voidage is not greatly changed with the increment of the asphalt dosage.The dry and wet cleavage strengths of mixture first increase,and then decrease with the variation of asphalt dosage.The density,high-temperature stability,shearing strength,dry and wet cleavage strengths of the gradation B mixture are all higher than the gradation A mixture.The study makes clear that the gradation is the most key factor to determine various performances of cold recycling mixture.