Stress-Strain Properties of Surlightweight Polymer Concrete

초경량(超輕量) 폴리머 콘크리트의 응력(應力)-변형특성(變形特性)

  • Sung, Chan Yong (Dept. of Agricultural Engineering, College of Agriculture, Chungnam National University) ;
  • Kim, Kyung Tae (Graduate School, Chungnam National University) ;
  • Min, Jeong Ki (Dept. of Agricultural Engineering, College of Agriculture, Chungnam National University) ;
  • Kim, Young Ik (Graduate School, Chungnam National University) ;
  • Youn, Joon No (Graduate School, Chungnam National University) ;
  • Jung, Hyun Jung (Graduate School, Chungnam National University)
  • Published : 1998.12.30

Abstract

This study was performed to evaluate the stress-strain properties of surlightweight polymer concrete using synthetic lightweight aggregates. The following conclusions were drawn; 1. The dynamic modulus of elasticity was in the range of $1.514{\times}10^5{\sim}1.916{\times}10^5kgf/cm^2$, which was approximately 48~96% of that of the normal cement concrete. It was showed larger with the decrease of synthetic lightweight fine aggregate. 2. The static modulus of elasticity was in the range of $2.552{\times}10^4{\sim}4.386{\times}10^4kgf/cm^2$, which was showed lower compared to that of the normal cement concrete. The poisson's number of surlightweight polymer concrete was less than that of the normal cement concrete. 3. The stress-strain curves of surlightweight polymer concrete were showed smaller with the increase of expanded clay.

본 연구는 폴리머와 인공경량 세골재 및 인공경량 조골재를 사용한 초경량 폴리머 콘크리트의 응력-변형특성을 구명한 것으로서, 이 연구를 통해 얻어진 결과를 요약하면 다음과 같다. 1. 동탄성 계수는 $1.514{\times}10^5{\sim}1.916{\times}10^5kgf/cm^2$로써 보통 시멘트 콘크리트의 48~96%정도이며, 인공경량 세골재의 양이 적을수록 크게 나타났다. 2. 정탄성계수는 $2.552{\times}10^4{\sim}4.386{\times}10^4kgf/cm^2$으로 보통 시멘트 콘크리트의 8~22%정도로 작게 나타났고, 포아손수도 보통 시멘트 콘크리트보다 작게 나타났다. 3. 응력-변형율곡선은 모든 배합에서 응력의 증가와 함께 증가하다가 최대하중에서 파괴된후 급격한 감소를 보였으며, 보통 시멘트 콘크리트보다 취성이 크게나타났다. 4. 최대응력하에서의 변형율은 P1에서 $6.975{\times}10^{-3}$으로 가장 크게 나타났고, P9에서 $1.600{\times}10^{-3}$으로 가장 작게 나타났으며, 인공경량 조골재의 양이 많을수록 작게 나타났다.

Keywords