Abstract
Field experiments on the compaction for Roller Compacted Dam (RCD) concrete have been conducted to investigate its compaction mechanism. In these tests, no slump concrete with poor cement content was spread in 18 to 25cm layers by bulldozers, and three layers were compacted in 54 to 75cm lifts by vibratory rollers. Non-contact type displacement devices were embedded at the top of each bulldozer spread layer to measure the internal displacement during bulldozer spreading and vibratory roller compacting. Density and unconfined compressive strength were tested for the drilled core specimen obtained from hardened concrete. From these test results, several conclusions were drawn on the (1) effects of bulldozer and vibratory roller on the compaction of RCD concrete, (2) the procedure to determine the most suitable quantity of cement paste content in the design of mix proportion and, (3) field quality control method for compaction.
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