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Evaluation of pH and Compressive Strength Development of Alpha-Calcium Sulfate Hemihydrate-based Binder
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 Title & Authors
Evaluation of pH and Compressive Strength Development of Alpha-Calcium Sulfate Hemihydrate-based Binder
Lee, Kyung-Ho; Yang, Keun-Hyeok;
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This study examined the compressive strength development and pH values of alpha-calcium sulfate hemihydrate()-based binders developed for vegetation concrete with neutral pH between 6~7. Considering cost down and strength enhancement of the prepared binders, the was partially replaced by ground granulated blast furnace slag(GGBS), fly ash(FA), or ordinary Portland cement(OPC) by 25% and 50%. The compressive strength of mortars using 100% was 50% lower than that of 100% OPC mortars. With the increase of the replacement level of GGBS or FA, the compressive strength of -based mortars tended to decrease, whereas the pH values were maintained to be 6.5~7.5. The main hydration products of -based binders with GGBS or FA were a gypsum(), whereas portlandite() was not observed in such binders. Meanwhile, the pH values of -based binders with OPC exceeded 11.5 due to the formation of phase as a hydration product. From the thermogravimetric analysis, the amount of in -based binders with OPC was evaluated to be approximately 10% of the cement content.
vegetation concrete;neutral pH;compressive strength;alpha-calcium sulfate hemihydrate;portlandite;
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