Impact Roller Compaction of Dry Sand in Laboratory Tests

A laboratory investigation of the influence of different factors including weight, size and towing speed of impact modules on the effectiveness of impact roller (IR) compaction was carried out. An impact roller simulation device was developed to do the investigation and air pluviation technique was used to prepare loose dry sand specimens. The Chinese cone penetration tests in the position of impact craters in sand specimens with different passes of IR compaction were used to verify the effectiveness of IR compaction. Results of the laboratory tests show that the weight and towing speed of module significantly affect the effectiveness of IR compaction but the size of module has a little influence on effectiveness. It is mainly obtained that better improvement can be achieved when heavier impact modules are used and towing speeds close to the optimum towing speed are adopted during IR compaction.