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.

Keywords:

• Alkali-activated slag high performance concrete
• split hopkinson pressure bar test system
• dynamic compressive strength
• stress–strain curve
• impact ductility
• energy dissipation

Acknowledgement

Thank you for the impact dynamics experimental equipment and stomatal analyzer provided by the School of Civil Engineering and Architecture of Anhui University of Science and Technology, and for the SEM equipment provided by the Analysis and Testing Center of Anhui University of Science and Technology.

Disclosure statement

No potential conflict of interest was reported by the authors.

Data availability statement

The data that support the findings of this study are openly available in ‘Science Data Bank’ at https://doi.org/10.57760/sciencedb.08786

Additional information

Funding

The study was supported by a grant from the University Synergy Innovation Program of Anhui Province, China, grant number GXXT-2019-005.