抄録
Degradation of polyester resin mortar has been studied by using unsaturated polyester resins having different resistances against boiling water, and by measuring the change in flexural strength during the course of soaking in boiling water, in order to clarify the relation between the resistances of the polyester resin mortar and the unsaturated polyester resin used against boiling water.
The results showed that the resistance of the resin mortar against boiling water depends mainly on that of the unsaturated polyester resin used, although some effects of adhesion of the unsaturated polyester resins to natural silica sand and calcium carbonate are also present.
