Standard compression rate test method and its application for rockfill materials

To explore the standard compression rate test method’s suitability for rockfill and to solve the problem that rockfill is too large for the laboratory standard test, the similar grading method was used to scale down the rockfill. This was used to simulate five kinds of rockfill with different solid phase volume ratios of skeleton and gap-filling particles (7:3, 6:4, 5:5, 4:6, 3:7, respectively). The density property, maximum compression rate and the strength property tests were carried out on the five fill materials using a self-designed test device. The test results showed that the loose packing density, initial compression density, compact density and California bearing ratio of rockfill increase and then decrease with a decrease of the solid phase volume ratio between skeleton and gap-filling particles. The compressibility and crushing rate of the filler stone decreased with the decrease of the solid phase volume ratio of the skeleton to the gap-filling particles. The maximum compression rate of the filler is determined by the laboratory compression test, and the compaction can be measured according to the compression rate, for a known paving area.