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Title |
Toughness Improvement of Unsaturated Polyester Mortars Blended with Polyurethane Liquid Rubber
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Keywords |
불포화 폴리에스테르 수지; 폴리우레탄 액상고무; 재생골재; 취성; 내충격성; unsaturated polyester resin; polyurethane liquid rubber; recycled fine; aggregates; toughness; brittleness |
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Abstract |
Generally polymer mortar and concrete using unsaturated polyester resin has high strengths and good chemical resistance. However it also has high brittleness and because of this reason, it is not used for the purpose that demands high resistance to impact. The purpose of this study is to improve the brittleness of unsaturated polyester mortar(UPE mortar) which could be used for the flooring material with recycled aggregates and UPE. Polyurethane liquid rubber(PU) and recycled aggregates were used to complement the brittleness and to recycle the resources respectively. The characteristics of mortar were investigated according to the molecular weight and substitution rate of PU. As the molecular weight and PU substitution rate were increased, the viscosity was increased, working life became fast and curing shrinkage was reduced. Compressive and flexural strengths were also reduced but tile brittleness was improved. Therefore, it is seemed that the improved WE mortar could be obtained by using polyurethane liquid rubber with the polyol of molecular weight 2000, 3000.
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