Journal of the Korea Institute of Building Construction (한국건축시공학회지)

The Korean Institute of Building Construction (한국건축시공학회)
권호 표지
DOI QR코드

DOI QR Code

Stress-Strain Relationship of Alkali-Activated Hwangtoh Concrete under Chemical Attack

화학적 침해를 받은 알칼리활성 황토콘크리트의 응력-변형률 관계

  • Mun, Ju-Hyun (Department of Architectural Engineering, Kyonggi University Graduate School) ;
  • Yang, Keun-Hyeok (Department of Plant.Architectural Engineering, Kyonggi University)
  • Received : 2014.01.03
  • Accepted : 2014.03.04
  • Published : 2014.04.20
Download PDF
⟨ Previous Next ⟩

Abstract

This study examined the effect of chemical attack on the stress-strain relationship of alkali-activated Hwangtoh concrete. Water-to-binder ratio and air content were selected as mixture parameters. The stress-strain relationship of concrete was measured at chemical immersion times of 0, 7, 28, 56, and 91 days from an age of 28 days. Based on the test results, the reduction in compressive strength of alkali-activated hwangtoh concrete owing to chemical attack was formulated. In sddition the present study demonstrated that the stress-strain behavior of concrete under chemical attack is significantly dependent on the air content and chemical immersion time, indicating the rate of decrease of modulus of elasticity was greater than that of compressive strength at the same immersion time. As a result, the stress-strain behavior of concrete under chemical attack was significantly inconsistent with the conventional models specified in the CEB-FIP provision.

본 연구에서는 알칼리활성 황토콘크리트의 응력-변형률 관계에 대한 화학적 침식의 영향을 평가하였다. 배합의 주요변수는 물-결합재비와 공기량이다. 알칼리활성 황토콘크리트의 응력-변형률 관계는 재령 28일 이후 침지일이 0, 7, 28, 56 및 91일일 때 측정하였다. 실험결과를 기반하여, 화학적 침식하에서 감소된 알칼리활성 황토콘크리트의 압축강도 모델이 제시되었다. 또한, 화학적 침식하에서 알칼리활성 황토콘크리트의 응력-변형률 관계는 공기량과 화학용액에 침지된 일수에 현저한 영향을 받았는데, 침지일수에서 탄성계수의 저하는 동일한 압축강도 저하비율에 비해 더 컸다. 결과적으로 CEB-FIP 기준의 예측모델은 화학적 침식하에서 측정된 응력-변형률 관계와 잘 일치하지 않았다.

Keywords

References

  1. Hwang HZ. A Study on the Method Activating Kaolin and Mortar & Concrete Mixed with Active Kaolin [Ph. D. Thesis]. [Seoul (Korea)]. Seoul National University; 1997. 94 p.
  2. Hwang HZ, Lee JK, Yang JH. An Experimental Study for Basic Properties of Hwangto Binder. Journal of Architectural Institute of Korea. 2008 January;24(1):79-86.
  3. Yang KH, Hwang HZ, Song JG. Development of a Cementless Mortar using Hwangtoh Binder. Building and Environment. 2007 October;42(10):3717-25. https://doi.org/10.1016/j.buildenv.2006.09.006
  4. Yang KH, Hwang HZ, Lee S. Effects of Water-Binder Ratio and Fine Aggregate-Total Aggregate Ratio on the Properties of Hwangtoh-Based Alkali-Activated Concrete. Journal of Materials in Civil Engineering, ASCE. 2010 February;22(9):887-96. https://doi.org/10.1061/(ASCE)MT.1943-5533.0000091
  5. CEB-FIP Model Code 1990, Structural Concrete: Textbook on Behaviour, Design and Performance. Switzerland: International Federation for Structural Concrete(Fib); 1999. 224p.
  6. Ministry of Land, Transport and Maritime Affairs. Concrete Standard Specification. Korea Concrete Institute; 2009. 360p.
  7. Japanese Standards Association. JIS K 8180: Hydrochloric acid. JSA; 2006. 12p.
  8. Japanese Standards Association. JIS K 8951: Sulfuric acid. JSA; 2006. 12p.
  9. Korea Industrial Standard. KS F 2405 Standard Test Method for Compressive Strength of Concrete. Korean Standards Information Center; 2010. 16p.
  10. ASTM. C 469 Standard Test Method for Static Modulus of Elasticity and Poisson's Ratio of Concrete in Compression. ASTM International: West Conshohocken, Pennsylvania; 2010. 5p.