Recently, resin concrete, which is a kind of composite materials made of synthetic resins, sands, gravels and so on, has become recognized as a regular structural material. But, as this material has not been in service for a long time unlike cement concrete which has been applied to structural purposes for about two centuries, it is very necessary to investigate its durability. Particularly, the durability study in water is most important for the case of resin concrete made of unsaturated polyester resin, from the point of view of the property of the resin.
From this point of view, we have carried out some accelerated experiments on its durability in water and on its chemical resistance, and tried to clarify the ageing behavior of this material by deriving an experimental equation for durability in its property from these experiments. In addition, the same material was immersed in water at room temperature for about six years. The results showed that this resin concrete has very excellent durability in comparison with cement concrete.
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