A new generation of geopolymers
HUYNH
Type de document
COMMUNICATION AVEC ACTES INTERNATIONAL (ACTI)
Langue
anglais
Auteur
HUYNH
Résumé / Abstract
This paper presents the development of a new generation of geopolymers, 100% free of Portland cement. A new synthesis procedure of alkali-activated blended binder based on the alkaline activation of aluminosilicate materials at ambient temperature, was investigated by using a non corrosive alkaline activator (combination of sodium silicate and sodium hydroxide). In order to enlarge the potential applications and to produce more eco-friendly, and less energy consuming binders, two cementitious systems using metakaolin on the one hand and combinations of metakaolin and clays or industrial by-products on the other hand, were prepared to evaluate the mechanical strength development of the resulting alkali-activated binary blended binder mortars. The measured flexural and compressive strength development of binary blended binder mortars were controlled through the dosage of the alkaline activator and the choice of the raw materials. In addition, this paper has assessed the effect of a new type of superplasticizer on the mechanical strengths of various alkali-activated binder mortars. The results indicate that the addition of small amount of superplasticizer has a significant influence on the mechanical strength development of the alkali-activated binary blended binder mortars. This research is of practical interest for civil engineering applications, since alkali-activated cementitious materials could be used in the future as an eco-friendly sustainable construction material alternative to ordinary Portland cement.
