Research on the Variability of the Aggregate Gradation of Asphalt Mixture and Its Dynamic Control Measures

This paper studies on the aggregate in both hot bins and its raw shape of different batches but of the same origin,analyses the principles and causes of aggregate gradation variability,and explores the measures of dynamic control over gradation adopted in asphalt mixing.It notifies that the ore crushing process constitutes the prerequisite for the reduction of aggregate gradation variability.We should gear the screen aperture of the crusher to that of the gradation control system in asphalt mixing,and take good use of the average ratio of aggregate passing key screen aperture and the dynamic range charts so as to bring scientific guidance to later production.In addition,we should also constantly conduct inspections on the production process due to the postponement of the dynamic control charts.