Method for determining void content of coarse aggregates in asphalt mixture based on gyratory compactor

Abstract

The invention relates to the field of road engineering technologies, and specifically to a method for determining the void content of coarse aggregates in an asphalt mixture based on a rotary compactor. The method comprises: preheating the screened coarse aggregates and dry mixing to form a primary skeletal mixture; subsequently adding hot asphalt and wet mixing to obtain a uniformly coated pre-coated mixture; loading the mixture into a test mold in layers according to the “three-layer method” and leveling the surface; performing dynamic compaction using a rotary compactor under preset parameters and recording the height change of each compaction in real time; calculating, based on the height data, the relative density of coarse aggregate voids and the skeletal void content VCAn inside the test mold under different compaction numbers; determining the characteristic compaction number by plotting the VCAn compaction number relationship curve and identifying the intersection point of the asymptotes; and finally reading the void content VCA0. The method innovatively defines the skeletal stabilization point scientifically using the asymptote intersection, thereby avoiding manual error and aggregate crushing, significantly improving testing accuracy and engineering applicability, and providing a highly reliable parameter basis for asphalt mixture design.