2023 Volume 79 Issue 18 Article ID: 23-18068
The stability of seaweed blocks using coal ash placed on the sandy seabed was examined by hydraulic model experiments. The coal ash mixture has a lower density than ordinary concrete, which is disadvantageous for the stability of seaweed blocks. However, the stability was ensured by devising the block shape. The following blocks were used in the experiment. (1) Rectangular blocks with normal density, (2) Rectangular blocks with low density, and (3) Two types of seaweed blocks with holes, slopes, legs and with same low density as (2) that have the same representative lengths as the rectangular blocks. As a result of the experiment, rectangular blocks with normal density were stable. Rectangular blocks with low density were not stable. Seaweed blocks devised shape with low density were stable. The legs of the block contributed greatly to its stability.
