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Title |
Review of Compressive Strength Development Models by W/C Ratio Involving Concrete Specimens Exposed to a Seaside Environment for 15 Years
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Authors |
이빛나(Binna Lee) ; 이종석(Jong Suk Lee) |
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DOI |
https://doi.org/10.4334/JKCI.2023.35.4.389 |
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Keywords |
옥외노출; 장기 압축강도; 물/시멘트비; 압축강도 예측 모델 outdoor exposure; long-term compressive strength; W/C; prediction model of compressive strength |
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Abstract |
In this study, long-term exposure experiments were conducted to examine various types of specimens in a domestic environment. The test specimens were categorized into three types based on the water-to-cement (W/C) ratio. The compressive strength of the specimens was measured and compared to the predictive models proposed by Korean Design Standards (KDS) and American Concrete Institute standards (ACI). The analysis of the compressive strength in relation to the W/C ratio showed that the 1st-year compressive strength increased by a minimum of 12 % and a maximum of 56 % compared to the 28th-day strength, while the 15th-year compressive strength exceeded 70 % compared to the 28th-day strength. When comparing the predictive models for different time periods, the 3rd-year model showed a difference of up to 8 % from the 15th-year compressive strength, and the 1st-year model ranged from a minimum increase of 13 % to a maximum of 32 % compared to the 15th-year compressive strength. Using the data measured at the 15th year, a compressive strength prediction model was derived by the Korea Institute of Civil Engineering and Building Technology (KICT) and compared with the prediction models of KDS, ACI, CEB, and JSCE. When comparing the models, the KICT model consistently showed about 22~34 % higher predicted strengths than the other models, regardless of the W/C ratio.
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