Study on early dynamic compressive strength of alkali-activated slag high performance concrete

Abstract

The effects of different flyash content, steel fibre content and water-binder ratio on the dynamic compressive strength of alkali-activated slag high performance concrete (ASHPC) were studied. When flyash and water-binder ratio rose, the dynamic compressive strength of ASHPC fell by 27.3% and 23.5%, respectively, and increased by 81.6% when steel fibre content increased. The dynamic elastic modulus rises by 35.0% with an increase in steel fibre content and falls by 48.0% and 65.6%, respectively, with an increase in flyash content and water-binder ratio. The toughness conversion ratio and pre-peak toughness ratio dropped by 34.1% and 9.5%, respectively, whereas the post-peak toughness ratio rose by 36.4% with an increase in flyash content. The test block’s pre-peak toughness ratio and toughness conversion ratio increased by 12.7% and 60.0%, respectively, with an increase in steel fibre , whereas the post-peak toughness ratio declined by 31.0%. With the increase of water-binder ratio, the pre-peak toughness ratio and toughness conversion rate of the test block increased by 31.0 % and 132 %, respectively, and the post-peak toughness ratio decreased by 42.8 %. The energy absorption and reflection rise while the energy transmission falls as flyash concentration and the water-binder ratio rise. The transmission energy rises as the amount of steel fibre grows, while the energy absorption and reflection fall.