An Experimental study on the Engineering Properties of Concrete with Rice-Husk Ash

왕겨재를 혼입(混入)한 콘크리트의 공학적(工學的) 특성(特性)에 관(關)한 실험적(實驗的) 연구(硏究)

  • Sung, Chan Yong (Dept. of Agricultural Engineering, College of Agriculture, Chungnam National University) ;
  • Yoo, Byong In (Graduate School of Education, Chungnam National University) ;
  • Kim, Kyung Tae (Graduate School, Chungnam National University) ;
  • Jung, Hyun Jung (Graduate School, Chungnam National University) ;
  • Kim, Young Ik (Graduate School, Chungnam National University)
  • Published : 1997.12.30

Abstract

This study was performed to evaluate the engineering properties of rice-husk ash concrete using normal portland cement, natural aggregates and rice-husk ash. The following conclusions were drawn; 1. The unit weight was in the range of $2,216{\sim}2,325kgf/m^3$, the weights of those concrete were decreased 1~6% than that of the normal cement concrete, respectively. 2. The highest strength was achieved by 10% rice-husk ash filled rice-husk ash concrete, it was increased 8% by compressive strength, 17% by tensile strength and 18% by bending strength than that of the normal cement concrete, respectively. 3. The ultrasonic pulse velocity was in the range of 3,252~4,016 m/s, which was showed about the same compared to that of the normal cement concrete. The highest ultrasonic pulse velocity was showed by 10% rice-husk ash filled rice-husk ash concrete. 4. The dynamic modulus of elasticity was in the range of $242{\times}10^3{\sim}306{\times}10^3kgf/cm^2$, which was showed about the same compared to that of the normal cement concrete. The highest dynamic modulus was showed by 10% rice-husk ash filled rice-husk ash concrete. 5. The static modulus of elasticity was in the range of $185{\times}10^3{\sim}275{\times}10^3kgf/cm^2$, which was showed about the same compared to that of the normal cement concrete. The poisson's number of rice-husk ash concrete was less than that of the normal cement concrete. The dynamic modulus was increased approximately 11~30% than that of the static modulus. 6. The durability was increased with increase of the content of rice-husk ash. The durability was increased 1.3 times by 10% rice-husk ash, 1.6times by 20% rice-husk ash filled concrete than that of the normal cement concrete. respectively.

본 연구는 보통 포틀랜드 시멘트와 천연골재 및 왕겨재를 혼입한 왕겨재 콘크리트의 공학적 특성을 실험적으로 구명한 것으로서, 연구를 통하여 얻어진 결과를 요약하면 다음과 같다. 1. 단위중량은 $2,216{\sim}2,325kgf/m^3$정도의 범위로서 보통 시멘트 콘크리트에 비해 1~6%정도 감소되었다. 2. 각 강도는 왕겨재를 결합재량의 10%를 혼입한 콘크리트에서 가장 크게 나타났으며, 보통 시멘트 콘크리트에 비해 압축강도는 8%, 인장 강도는 17%, 휨인장강도는 18% 증가되었다. 3. 초음파진통속도는 3,252~4,016 m/s 정도로서 보통 시멘트 콘크리트와 유사하게 나타났으며, 왕겨재를 10% 혼입한 콘크리트에서 가장 높은 값을 보였다. 4. 동탄성계수는 $242{\times}10^3{\sim}306{\times}10^3kgf/cm^2$정도로 보통 시멘트 콘크리트의 90~113%로써 보통 시멘트 콘크리트와 유사하게 나타났으며, 왕겨재를 10% 혼입한 콘크리트에서 가장 높게 나타났다. 5. 정탄성계수는 $185{\times}10^3{\sim}306{\times}10^3kgf/cm^2$정도로 보통 시멘트 콘크리트와 유사하게 나타났으며, 왕겨재를 10% 혼입한 콘크리트에서 가장 크고, 포아손수는 보통 시멘트 콘크리트보다 작게 나타났으며, 동탄성계수는 정탄성계수 보다 11~30%정도 크게 나타났다. 6. 내구성은 왕겨재의 혼입량이 많을수록 증가되었으며, 왕겨재를 10% 혼입한 콘크리트와 20% 혼입한 콘크리트의 내구성은 보통 시멘트 콘크리트보다 각각 1.3배와 1.6배 정도 크게 나타났다. 7. 적정량의 왕겨재를 혼입하여 콘크리트를 제조할 경우, 왕겨재 콘크리트의 물리 역학적 성질이 보통 시멘트 콘크리트보다 우수할 뿐만 아니라, 농업 부산물의 재활용으로 인한 경제적 측면에서도 많은 기여를 할 수 있을 것이다.

Keywords