Journal of The Korean Society of Agricultural Engineers (한국농공학회논문집)

The Korean Society of Agricultural Engineers (한국농공학회)
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Effects of Aggregate and Curing Temperature on Strength Development of UP-MMA based Polymer Mortar under Sub-Zero Temperature

영하온도에서 UP-MMA 폴리머 모르타르의 강도 발현에 미치는 골재 및 양생온도의 영향

  • 연규석 (강원대학교 지역건설공학과) ;
  • 김용성 (강원대학교 지역건설공학과) ;
  • 차진윤 (강원대학교 지역건설공학과) ;
  • 손승완 (강원대학교 지역건설공학과)
  • Received : 2011.07.15
  • Accepted : 2011.09.26
  • Published : 2011.09.30
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Abstract

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 $-20^{\circ}C$.

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