抄録
The mechanical properties of resin concrete are greatly influenced by the circumferential temperature, since the concrete is made by using polymer as a binder of aggregate instead of portland cement. Therefore, the range of circumferential temperature suitable for this type of structural material should be clarified. In this study, the experimental investigation on creep characteristics of unsaturated polyester resin concrete used in practice was carried out, with consideration for the change of mechanical properties due to temperature. The main results obtained are as follows.
(1) The compressive strength of resin concrete cured for 28 days at 20°C was over 800kgf/cm2, and increased 15% more after 1 year. The same value of increment was obtained after 1 day curing at 80°C.
(2) When the polymerization degree was high enough, the value of final creep coefficient of resin concrete at the circumferential temperature of 20°C became about 0.5. It was considerably smaller than that of cement concrete.
(3) The allowable circumferential temperature of resin concrete for practical use as a structural material was found to be under 50°C.
(4) It is possible to estimate the final creep strain of resin concrete by extending the curve of the relationship between the measured creep and loading time straightly on the logarithmic coordinates.
