Abstract
Using sand of proper quality for the bedding and joint is important, to maintain the performance of interlocking (IL) blocks on roadway. A field test using actual vehicles started in FY1997 at the PWRI, to evaluate the durability of bedding sand for roadway. Natural sand performed the best of tested materials. Using resin to fix sand caused severe breakage of blocks or loss of joint sand. It also was found that to prevent the loss of joint sand, materials whose properties are similar to those of bedding sand are desirable. Our tests lead us to propose that to evaluate the quality of bedding sand used with IL blocks on roadway, resistance against finning should be tested by impact compaction.
