Freeze-thaw and sulfate resistance of geopolymer mortar made of waste material

الملخص EN

The aim of the present experimental study is to investigate the resistance of little cementitious value-based geopolymer mortars subjected to sulfate resistance (3 months) and freeze-thaw cycles (150 cycles).

Waste material was used as the base material to produce geopolymer mortar.

Three types of waste material, namely Slag (GGBFS), fly ash (FA) and glass powder (GP), all of which can be activated with an alkali agent, were selected to study the effect of the steam-cured (SC) and water-cured (WC) methods on the mechanical proporties of the geopolymer mortar with a constant concentration (12M) of sodium hydroxide.

Upon the analysis of the modulus of sodium silicate (Na2Si03 / NaOH = 1) and the different proportions amounts of geopolymer in these three materials-GGBFS, FA, and GP-the results indicate that the compressive strength value of all specimens was higher than the values obtained for them once not subjected to any freeze-thaw resistance test, except for those containing GGBS and GP.

It can be inferred that the investigated geopolymer FA materials possess an highly acceptable freeze resistance under water-cured conditions.

In addition, all these specimens exhibit high levels of resistance to magnesium sulfate immersion and again their compressive strength values under WC conditions are found to be higher than those under SC settings.