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BROWSE대한건축학회 논문집(구조계)2018-07 > DETAIL
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Title   바텀애시 및 준설토 기반 인공경량골재 콘크리트의 압축강도 발현 모델 제시 / Proposal for Compressive Strength Development Model of Lightweight Aggregate Concrete Using Expanded Bottom Ash and Dredged Soil Granules
Authors   이경호(Lee, Kyung-Ho) ; 양근혁(Yang, Keun-Hyeok)
Organization   대한건축학회
Source   대한건축학회논문집 구조계, Vol.34 No.07(2018-07)
Page   Start Page(19) Total Page(8)
ISSN   1226-9107
Classification   구조  
Keywords   경량골재 콘크리트 ; 압축강도 발현 ; 절건 밀도 ; 물-시멘트 비 ; 모델//Lightweight aggregate concrete ; Compressive strength development ; Oven-dried density ; Water-to-cement ratio ; fib model
Abstract2   This study tested 25 lightweight aggregate concrete (LWAC) mixtures using the expanded bottom ash and dredged soil granules to examine the compressive strength gain of such concrete with different ages. The test parameters investigated were water-to-cement ratios and the natural sand content for the replacement of lightweight fine aggregate. The compressive strength gain rate in the basic equation specified in fib model code was experimentally determined in each mixture and then empirically formulated as a function of the water-to-cement ratio and oven-dried density of concrete. When compared with 28-day compressive strength, the tested LWAC mixtures exhibited relatively low gain ratios (0.49~0.82) at an age of 3 days whereas the gain ratios (1.16~1.41) at 91 days were higher than that (1.05~1.15) of the conventional normal-weight concrete. Thus, the fib model equations tend to overestimate the early strength gain of LWAC but underestimate the long-term strength gain. The proposed equations are in good agreement with the measured compressive strength development of LWAC at different ages, indicating that the mean and standard deviation of the normalized root mean square errors determined in each mixture are 0.101 and 0.053, respectively.
Location   대한건축학회