Distribution Characteristics of Quality Variability during Construction of Asphalt Pavement

On the basis of in-situ inspection during construction of asphalt pavement,and laboratory tests,the distribution characteristics and the variation of some parameters are measured and analyzed,and the parameters are gradation composition of asphalt mixture during pavement construction,in terms of compacting depth and density and air voids of pavement.The results of the test and evaluation show that the gradation curve of asphalt mixes produced in-situ are in S-shape mainly,with content of granule size smaller than 0.075mm exceeding the design upper limit.The bigger the width of paver,the larger the segregation extent of mix gradation would be.Maximum variation of voids distribution would occur at the edge of the paver,and maximum variation of structure depth distribution at the joint between two pavers.