Abstract
Geopolymers have received extensive attention due to their greenhouse effect. However, the application of geopolymers has been restricted by their workability and manufacturing technique. Hybrid alkali-activated cements (HAACs), which are transition materials between cement and geopolymers, have gradually been developed. The chemical reactions of HAACs are complicated, and adjusting their performance is difficult. In this study, the competitive reactivities and phase contents of commonly used HAACs with different raw material compositions and curing conditions are examined. The reaction degrees of the clinker (RoC), C-(A)-S-H+N(C)-A-S-H gel and unreacted amorphous particle (UAP) contents were calculated. The experimental results indicated that the quantity and structure of the gel were optimized when the Si2O/Na2O and Na2O contents of HAAC-G3 were 1.5 and 4 %, respectively, and the cement: mineral admixture ratio was 1:4. Moreover, a large amount of N-A-S-H with a dense structure was produced by alkali reactions rather than cement hydration reactions in HAAC-G3; these reactions improved the macroscopic mechanical properties. Additionally, the effects of steam curing on the properties of the HAACs were slight because of the internal water competition reaction mechanism. This research clarified the influence of different coordination methods on the internal reaction mechanism of HAACs and could be used to promote the engineering application of HAACs. Moreover, HAACs play an important role in mitigating greenhouse effects worldwide.
Published Version
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call