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Prediction Equation for Chloride Diffusion in Concrete Containing GGBFS Based on 2-Year Cured Results

2년 양생 실험결과를 이용한 고로슬래그 미분말 콘크리트의 염화물 확산 예측식

Yoon, Yong-Sik;Cho, Sung-Jun;Kwon, Seung-Jun
윤용식;조성준;권성준

  • Received : 2018.09.07
  • Accepted : 2018.11.12
  • Published : 2019.03.01

Abstract

GGBFS(Ground Granulated Blast Furnace Slag), one of the representative concrete mineral admixtures, improves the long-term durability and engineering performance of concrete by latent hydraulic activity. In this study, considering 3 levels of W/B(0.37, 0.42, 0.47) and GGBFS replacement ratio(0 %, 30 %, 50 %), durability performances for chloride attack are evaluated, and equations which predict behavior of accelerated chloride diffusion are proposed. Also, the relationship between accelerated chloride diffusion coefficient and passed charge is evaluated. In target curing day, accelerated chloride diffusion tests(Tang's method, ASTM C 1202) and compressive strength(KS F 2405) are performed. In the 730 day's results of accelerated chloride diffusion coefficient, GGBFS concrete has up to 28 % of decreasing ratio compared to OPC concrete, and in those of passed charge, GGBFS concrete has up to 29 % of decreasing ratio compared to OPC concrete. Also, it is deemed that the impact of variation of W/B is less in GGBFS concrete than in OPC concrete. The equations which predict accelerated chloride diffusion coefficient and passed charge are drawn, based on the characteristics of mixture and test results. The equation which predicts passed charge shows slightly higher coefficient of determination than that which predicts accelerated chloride diffusion coefficient.

Keywords

GGBFS;Accelerated diffusion coefficient;Passed charge;Compressive strength;Regression analysis

Acknowledgement

Supported by : 한국연구재단