Drying Shrinkage of High-Strength Concrete

고강도 콘크리트의 건조수축

Drying shrinkage is the decrease in the volume of a concrete element when it loses moisture by evaporating. Because of low water/binder ratio(W/B) and the use of chemical and mineral admixtures for high-strength concrete, the evolutions of moisture and the rate of cement hydration in high- strength concrete are significantly different from those in normal strength concrete. In this study, the drying shrinkage of high-strength concrete with and without fly ash was measured up to the age of 200 days. From the experimental test results, it was observed that the drying shrinkage decreased as the W/B decreased. As the W/B is lowered from 0.50 to 0.27, the difference of drying shrinkage between the fly ash concrete and the ordinary concrete is gradually increased.