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설계 활용을 위한 55∼220MPa 고강도 및 초고강도 콘크리트의 역학적 특성에 관한 예측식 제안
신현오(Shin, Hyun-Oh),이승훈(Lee, Seung-Hoon),이우진(Lee, Woo-Jin),윤영수(Yoon, Young-Soo) 대한건축학회 2013 大韓建築學會論文集 : 構造系 Vol.29 No.10
Increasing need for ultra-high-strength concrete as a primary structural material in high-rise building construction has underlined mechanical properties of ultra-high-strength concrete as one of the key consideration in design. Unfortunately, current code provisions are the results of tests done on normal strength concrete or high-strength concrete and these provisions may neither be adequate nor safe for structural member with ultra-high-strength concrete. Accordingly, regression analysis was carried out using experimental data from this study and data from the literature and prediction equations for mechanical properties such as compressive strength gain with time, splitting-tensile strength, flexural strength, modulus of elasticity, and poisson"s ratio were proposed. The reliability of the proposed equations were assessed by R2 value and the proposed equations have been found to give a good representation of the actual mechanical properties of concrete. The validity of equations recommended by KCI 2007 for estimating mechanical properties of concrete can be extended for high-strength and ultra-high-strength concrete with average compressive strengths ranging between 55 and 220MPa.
잔골재 종류에 따른 200MPa 초고강도 콘크리트의 역학적 특성 평가
신현오(Shin, Hyun-Oh),이승훈(Lee, Seung-Hoon),이우진(Lee, Woo-Jin),윤영수(Yoon, Young-Soo) 대한건축학회 2013 大韓建築學會論文集 : 構造系 Vol.29 No.9
This paper presents an experimental study of the mechanical properties such as compressive strength, splitting-tensile strength, flexural strength, modulus of elasticity, and poisson"s ratio of 200MPa ultra-high-strength concrete. Effects of primary variables such as fine aggregate type and curing age were studied in this research program. Silica sand, electric arc furnace oxidizing slag, and washed sand were used in the concrete as fine aggregate. For each fine aggregate type, mechanical properties were evaluated at age of 3, 7, 14, 28, 56, and 91 days. The mechanical properties of ultra-high-strength concrete specimens were characterized by extremely brittle and explosive behavior without notable micro-crack or advance warning before failure. Test results indicated that using silica sand as fine aggregate are effective in long term mechanical properties of ultra-high-strength concrete. A comparative study of existing prediction equations for mechanical properties of concrete was also conducted to asses their capabilities of predicting the mechanical properties of ultra-high-strength concrete. To this end, test results in the present study were compared with currents code equations.