Abstract
Sea sands contain minute perticles little (below 0.15mm).
Therefore, when sea sands are used in concrete for dams of low cement content, we must supply them with some minute particles in appropriate methods.
We investigated supplementing methods of minute particles by fresh mortar and fresh concrete, and we decided to add slag powders to sea sands in the concrete of Nagatani Dam.
This concrete for the dam is workable and has no problem of thermal properties.
And we also made sure that it has no problem of the concrete durability.
Now, Nagatani Dam's work, using sea sands for fine agregates of concrete for dams, is going well.
