华中科技大学学报（自然科学版）2017，Vol.45Issue(8)：105-109,5.DOI:10.13245/j.hust.170820
集料复配情况下沥青混合料小梁弯曲试验研究
Study on the beam bending test of asphalt mixture composed by mixed aggregates with different densities
摘要
Abstract
The actual volume gradation was deviate from the target volume gradation due to density difference between the aggregates composing the asphalt mixture.In order to investigate its influence on the performance of asphalt mixture,the revised method for the gradation design was proposed firstly to assure the target volume gradation by the revised mass weighing method.Then,the universal testing machine (UTM) was adopted to verify the revising process by the beam bending test (BBT).The aggregates density difference,ratio of filler/bitumen (F/B),different aggregate lithology,compaction number and loading rate of BBT were all evaluated to give the following results.The density difference should not be neglected for it will affect the ratio of filler in the mixture,especially the ratio of F/B and followed by low temperature performance of mixture.The aggregate lithology will not affect the low temperature performance of mixture if the density difference is taken into consideration to assure the target volume gradation.Compared to the medium and fine gradation,coarse gradation possesses better low temperature performance.Compaction number could affect the mixture bending ability to a large extent.Loading rate of BBT could greatly influence the bending strain,which should be set up carefully.关键词
沥青混合料/配合比/空隙率/密度/低温性能Key words
asphalt mixture/mixture ratio/void volume/density/low temperature performance分类
交通工程引用本文复制引用
白桃,胡小弟..集料复配情况下沥青混合料小梁弯曲试验研究[J].华中科技大学学报（自然科学版）,2017,45(8):105-109,5.基金项目
国家自然科学基金资助项目(51508427) （51508427）
湖北省自然科学基金资助项目(2014CFB772). （2014CFB772）
