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Title |
Compressive Strength Development Model for Bottom Ash Aggregate Concrete
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Authors |
이혜진(Hye-Jin Lee) ; 김학영(Hak-Young Kim) ; 양근혁(Keun-Hyeok Yang) |
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DOI |
https://doi.org/10.4334/JKCI.2021.33.4.381 |
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Keywords |
바텀애시 골재; 압축강도 발현; 단위용적중량; fib 모델 bottom ash aggregate; compressive strength development; unit weight; fib model |
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Abstract |
This study examined the compressive strength gain of bottom ash aggregate (BAA) concrete at early and long-term ages and proposed a reliable evaluation model on the basis of regression analysis of data sets. The tests were conducted with different parameters including the ratios of normal weight aggregate content relative to the BAA content, water-to-cement ratio (), fine aggregate-to-total aggregate ratio (), and unit water content (). Test results showed that the main parameters influencing 28-day compressive strength were BAA content, , and , which also influenced the compressive strength gain at different ages. Considering the compressive strength development of concrete, it is recommended to use BAA as fine aggregate rather than as coarse aggregate. The proposed model estimated accurately the compressive strength development of BAA concrete, resulting in mean and standard deviation of ratios between predictions and experiments of 1.08 and 0.19, respectively, at age of 3 days, and 1.03 and 0.06, respectively, at age of 91 days.
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