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This paper investigates the effect of three different superplasticizers (SPs), Naphthalene (N), Melamine (M) and Polycarboxylate (PC), on the properties of one-part fly ash/slag geopolymer pastes activated by Ca(OH)₂/Na₂SO₄ powder combination. The flowability, setting time, and compressive strength of the achieved geopolymer pastes were assessed. It was found that the superplasticizers significantly improved the flowability, retarded the setting time, and increased the compressive strength of the one-part Ca(OH)₂/Na₂SO₄ geopolymer pastes. The most recommended superplasticizer was found to be polycarboxylate.

The use of polycarboxylate SP for decreasing the water content (i.e. w/b) in Ca(OH)₂/Na₂SO₄ geopolymer pastes has resulted in reducing the porosity and enhancing the compactness of the aluminosilicate gel, therefore, improved the compressive strength. It was found that the excessive use of …