• 한국농공학회논문집
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• 제53권5호
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• pp.25-33
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• 2011

In this paper, the effects of aggregate and curing temperature on strength development characteristics of UP (Unsaturated Polyester)-MMA (Methyl Methacrylate) based polymer mortar under sub-zero temperature are experimentally investigated to provide a criterion for repair and production of precast products. The result showed that the setting time of the binder was 4 minutes at $20^{\circ}C$ whereas 35 minutes at $-20^{\circ}C$. The result also revealed that the compressive, flexural, and splitting tensile strengths of UP-MMA based polymer mortar significantly decreased as the aggregate and curing temperatures decreased. However, sufficient strengths which can be implemented in actual practices -36.6 MPa of compressive strength, 6.11 MPa of flexural strength, and 5.81 MPa of splitting tensile strength - were obtained even though both aggregate and curing temperatures were $-20^{\circ}C$. Strength development of polymer mortar is largely affected by curing temperature rather than aggregate temperature. It was found that the effects of aggregate temperature on strength development become smaller as the curing temperature becomes lower. Also, toughness, a ratio of compressive strength to flexural strength, increased from 3.5 to 5.9 as both aggregate and curing temperatures decreased from $20^{\circ}C$ to $-20^{\circ}C$.

• 폴리머
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• 제34권3호
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• pp.247-252
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• 2010

본 연구에서는 시멘트 복합체의 단점을 보완하기 위해 유기화합물인 폴리머를 시멘트 모르타르에 혼입하여 폴리머 시멘트 모르타르를 제작하고 이에 대한 인장력과 부착특성을 개선시키고자 하였다. 또한, 폴리머 시멘트 모르타르 내에서 형성되는 폴리머 필름의 인장강도와 유리전이온도가 폴리머 시멘트 모르타르의 인장강도와 부착특성에 미치는 영향을 파악하였다. 본 연구 결과 폴리머 시멘트 모르타르는 보통 시멘트 모르타르에 비해 인장강도의 경우 최대 2배 정도 증진효과를 나타내고 있었으며 부착특성에 있어서도 약 4배 정도의 증진효과가 나타났다.