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Title |
Evaluation of Shrinkage Strain of Alkali-Activated Slag Concrete
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DOI |
https://doi.org/10.4334/JKCI.2013.25.6.593 |
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Keywords |
알칼리활성 슬래그 콘크리트 ; 건조수축 변형률 ; 물-결합재비 ; 단위수량 ; 시간함수 AA slag concrete ; shrinkage strain ; water-to-binder ratio ; unit water content ; time function |
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Abstract |
The unrestrained shrinkage strain of alkali-activated (AA) slag concrete was examined and compared with design equations specified in code provisions and empirical equations proposed by Yang et al. The main parameters investigated were the water-to-binder ratio (W/B), unit water content and fine aggregate-to-total aggregate ratio (S/a). Test results revealed that shrinkage strain of AA slag concrete is nearly proportional to the W/B ratio, whereas its time function is independent of the W/B ratio. The shrinkage strain of AA slag concrete increased significantly when the unit water content is above 185 kg/m3, whereas it is marginally affected by the S/a ratio. The design equation of ACI 209 considerably overestimates the shrinkage behavior of AA slag concrete, whereas CEB-FIP equation tends to underestimate the shrinkage at the age more than 28 days. The empirical equation of Yang et al. is in better agreement with test results, showing that values of mean and standard deviation of error coefficients obtained from each specimen are 016 and 0.07, respectively.
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