Effect of Mineral Admixtures and Chemical Activators on the Strength of FGD Gypsum-Fly Ash Complex Cementing Material

Xin Tang Wang; Ming Zhou; Yi Zhang

doi:10.4028/www.scientific.net/AMR.250-253.469

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HomeAdvanced Materials ResearchAdvanced Materials Research Vols. 250-253Effect of Mineral Admixtures and Chemical...

Effect of Mineral Admixtures and Chemical Activators on the Strength of FGD Gypsum-Fly Ash Complex Cementing Material

Abstract:

A kind of FGD gypsum from Ningbo Beilun Power Plant of China and fly ash were used as the raw materials with which a complex cementing material was made. Effect of the related factors such as paste material, water proportion, mineral admixtures (Cement, CaO) and chemical activators (NaOH, CaCl₂, Na₂SiO₃, K₂SO₄) on characteristics of FGD gypsum-fly ash complex cementing material (noted as FGD-GFCM) is studied through a large number of single factor experiments. The additives with significant effect were chosen and the optimal mix proportion was determined. The experimental results show that an appropriate amount of admixtures can effectively improve the strength of the FGD gypsum–fly ash complex cementing material presented here. It is concluded that the strength of FGD-GFCB for 28d is best as the ratio of gypsum and fly ash is between 2:3 and 1:1 and water aggregate proportion is inversely proportional to the cementing material strength and apparent density of it.

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Periodical:

Advanced Materials Research (Volumes 250-253)

Pages:

469-473

DOI:

https://doi.org/10.4028/www.scientific.net/AMR.250-253.469

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Online since:

May 2011

Authors:

Xin Tang Wang, Ming Zhou, Yi Zhang

Keywords:

Chemical Activators, Complex Cementing Material, Flue Gas Desulphurization (FGD) Gypsum, Fly Ash (FA), Mineral Admixture

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