Research on evaluation method for measuring density and water absorption of coarse aggregate based on vacuum method
The density and water absorption of coarse aggregate are important parameters in the design of mixture proportions.In this paper,the density and water absorption of three kinds of coarse aggregates,Andesite,granite and limestone,are tested by vacuum saturation method and vacuum saturation method.The test results are compared with the basket method soaking for 24 hours,and the significance of the test data is analyzed to verify the superiority of the method.Research has shown that there is no significant difference in the experimental data of vacuum soaking for 10 minutes,20 minutes,and 30 minutes.For Andesite with strong water absorption,there are significant differences in apparent relative density and water absorption between the two vacuum soaking methods and basket soaking method for 24h.The density and water absorption measured by vacuum saturation method are both higher than those measured by vacuum saturation method.The density and water absorption of coarse aggregate measured by vacuum saturation method are closer to that of aggregate soaking for 24 hours.