혼화재 치환율을 고려한 성숙도 기반의 콘크리트 압축강도 평가 모델

Abstract

Jae-Sung Mun Keun-Hyeok Yang Yong-Soo JeonAbstractThe purpose of this study is to propose a simple model to evaluate the compressive strength development of concrete with various supplementary cementitious materials (SCMs) and cured under different temperatures. For the generalization of the model,the ACI 209 parabola equation was modified based on the maturity function and then experimental constants A and B and 28-daycompressive strength were determined from the regression analysis using a total of 265 data-sets compiled from the available literature. To verify the proposed model, concrete specimens classified into 3 Groups were prepared according to the SCM level as a partial replacement of cement and curing temperature. The analysis of existing data clearly revealed that the 28-day compressive strength decreases when the curing temperature is higher and/or lower than the reference curing temperature (20℃). Furthermore, test results showed that the compressive strength development of concrete cured under 20℃ until an early age of 3days was marginally affected by the curing temperature afterward. The proposed model accurately predicts the compressive strengthdevelopment of concrete tested, indicating that the mean and standard deviation of the ratios between predictions and experiments are 1.00 and 0.08, respectively.Keywords : Maturity function, Compressive strength development, Supplementary cementitious materials, Curing temperature