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Study on Testing the Relative Density of Coarse Aggregate by Vacuum Method instead of Basket Method

. In this paper, Vacuum Method was offered to test the relative density of coarse aggregate instead of basket method for the quick and exact mixture design of asphalt mixture. Firstly, the testing principle Vacuum Method was obtained by analyzing the experiment characteristic features of Vacuum Method and basket method. Secondly, the stability and accuracy of Vacuum Method were analyzed by testing the relative density of different kinds of coarse aggregate. Finally, the experiment conditions (the vacuum degree and pressure-holding time) were obtained through Comparison Experiment to the conventional basket method. The results show that the relative density of coarse aggregate can be tested quickly and exactly by Vacuum Method. This not only shortens the experiment time, but also raises working efficiency.