Investigation of Rutting and Segregation of Asphalt Mixtures in the State of Georgia

摘要

The objective of the project was to review existing GDOT specifications, mix design and construction procedures for asphalt concrete and to make recommendations for improvement where appropriate. The two primary areas of concern were aggregate segregation and rutting of asphalt pavements. Laboratory tests to study segregation showed that the loss of desirable mixture properties is significant when the gradation of the mixture is approximately 10% coarser than the job mix formula on the No. 8 sieve. Quality control is very important in reducing segregation. There is no correlation between the variability of plant sample gradations and the amount of segregation. The study of rutted pavements found that where in-place voids after traffic was low (1.5 to 3%) there were problems with rutting. Several rutted pavement projects had deviations in plant produced material of 2 to 5% on the No. 200 sieve.