Characteristics of hybrid alkaline cement composites with high cement content: flash set and high compressive strength

This paper explores hybrid alkaline cement composites with high content over 50%. Calcium (Ca) accelerates the strength development and improves compressive of geopolymer. However, mixing proportion Ca in geopolymer has been limited because significantly decreases flow fresh study resolves decline issue by a part initial water before adding it into metakaolin-based geopolymer, which is named (HACC) this study. The cement/(metakaolin + cement) ratio investigated up to 85%. Based on setting time results, some unique characteristics HACC are observed: i) material set within 10 min 28-day 80 MPa 1:1 paste, ii) not always higher lower w/c paste.