2023 Volume 34 Pages 95-104
In this study, a method for estimating the compaction completion range of low-slump dam concrete mixtures compacted by large-diameter hydraulic internal vibrators is proposed, and this estimation method is put into practical application for compaction quality control through visualization. The compaction completion range was estimated from the relationship between the vibration energy propagation in concrete and the compaction completion energy measured with a prototype device considering the maximum size of coarse aggregate. Then the estimated range values were verified by the quality of the hardened concrete. The results show that the compaction completion range of low-slump dam concrete can be estimated accurately using the compaction completion energy. Furthermore, by using this compaction estimation method, a system that enables quantitative evaluation by visualizing the compaction state inside the dam concrete was constructed and applied it to the construction work. As a result, it was found that measuring the compaction degree can contribute to the enhancement of quality control and the improvement of productivity.
