Study on the Effect of Polyurethane Emulsion on the Volume Stability of Alkali-Slag-Fly Ash Based Geopolymer
The volumetric stability changes of different dosages of polyurethane emulsion alkali-slag-fly ash base polymers ( AAFS) are investigated and the improving mechanism of their volumetric stability is revealed. The research shows that when the PU dosage is between 3％ and 7％, it prolongs the initial and final setting time of AAFS and reduces the flowability of the slurry. The addition of polyurethane reduces the generation of hydration products in AAFS, resulting in a decrease in the compressive strength of mortar. The 28-day compressive strength ranges from 38 to 45 MPa, and the 28-day flexural strength ranges from 6. 5 to 7. 7 MPa, with an increase in the flexural-to-compressive strength ratio by 14. 8％ to 22. 3％, indicating a significant improvement in toughness. The interaction between polyurethane and AAFS improves the volumetric changes of AAFS, with a shrinkage rate of 9. 7％ to 28. 4％ at 56 days, showing a significant decrease. Under the same conditions, the cracking resistance of AAFS modified by PU is significantly improved.
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