Study on influencing factors of void fraction of asphalt mixture based on grey correlation

grey relational analysis method has been widely used because it is applicable to small samples, irregular samples and has a small amount of calculation. For the study of shear compaction forming factors affecting air void of asphalt mixture, this paper studies a set of shear compaction meter uniform specimen preparation methods, and based on this through the grey relation analysis method the study type of asphalt, asphalt content, shear compaction times and fine aggregate level matching specimen void fraction, and it is concluded that the factors impact on the specimen void fraction size. The results show that the grey correlation method is an analytical method suitable for studying the influencing factors of the voidage of asphalt mixture. Among the influencing factors, the shear compaction times, the ratio of oilstone and the mass fraction of particle size <0.075mm are the three main factors affecting the voidage of shear compaction specimens. The research results have certain guiding significance for asphalt mixture design and construction quality control.