Effect of Expansive Agent on Properties and Microstructure of Coal Gangue-Slag-Fly Ash Based Geopolymer.

A decreasing trend in both 3-day and 28-day compressive strengths was observed in the MgO system ( Figure 5 b) as the content was increased from 3% to 7%, although the values remained higher than those of the reference group with only minor reductions.

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However, in the composite MgO-CaO system ( Figure 6 d), as the MgO content increased from 2% to 6% and the CaO content decreased from 6% to 2%, both the initial and final setting times exhibited an increasing trend, but they were all shorter than those of the reference group.

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