Abstract
Geopolymeric binders appear to be an alternative to traditional Portland cement, due to high mechanical performances and environmental
advantages. Some aspects related to the effect of aggregates in the microstructure and mechanical behaviour of geopolymeric mine waste mud
(GMWM) binders are reported in the present study. Compressive and tensile strength of mine waste mud binders were analyzed. The factors
investigated were the aggregate/binder ratio, the aggregate dimension and aggregate type, schist, granite and limestone.
Test results showed that GMWM binders have a very high strength at early ages and also possess a very high tensile strength. It's suggested
that behaviour may be due to the dissolution of quartz and alumina in the presence of alkalis enhancing bonding between paste and aggregates.
The aggregate dimension showed only significant effect on tensile strength. Limestone aggregates showed a chemical bond to the alkaliactivated
paste but presented higher shrinkage. It was also found that no traditional porous ITZ was detected in GMWM binders