Abstract
Geopolymer has been recognized as a promising construction material offering performance comparable to traditional cementitious materials while significantly reducing carbon dioxide emissions. Notably, the recent development of “one-part geopolymer”, which transforms the alkaline activator solution into a solid activator powder, has greatly enhanced construction convenience. One-part ultra-high performance geopolymer concrete (OP-UHPGC), which has mechanical properties comparable to ultra-high-performance concrete (UHPC), has been developed recently. This study investigates the dynamic compressive and splitting tensile properties of OP-UHPGC using a split Hopkinson pressure bar (SHPB). The damage progression, failure mode, dynamic stress and strain, dynamic increase factor (DIF), and energy absorption of OP-UHPGC specimens were systematically studied. Test results showed that OP-UHPGC exhibited strain rate sensitivity. Both compressive and splitting tensile DIFs increased with the strain rate, and empirical formulas were proposed to predict the DIFs of OP-UHPGC. The DIFs of OP-UHPGC were comparable with those of steel fibre-reinforced geopolymer or cementitious composites, yet smaller than those of plain geopolymers or conventional concrete reported in the existing literature. In addition, the energy absorption of OP-UHPGC under dynamic compression and splitting tension both increased with the strain rate. This study provides a valuable reference for the dynamic mechanical properties of OP-UHPGC.
Published Version
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