Technical feasibility for use of FGD gypsum as an additive setting time retarder for Portland cement | Zendy

Mariella Cortez Caillahua | Zendy; Francisco José Moura | Zendy

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Technical feasibility for use of FGD gypsum as an additive setting time retarder for Portland cement

Author(s) -

Mariella Cortez Caillahua,

Francisco José Moura

Publication year - 2017

Publication title -

journal of materials research and technology

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 0.832

H-Index - 44

eISSN - 2214-0697

pISSN - 2238-7854

DOI - 10.1016/j.jmrt.2017.08.005

Subject(s) - gypsum , portland cement , flue gas desulfurization , materials science , cement , leaching (pedology) , retarder , compressive strength , metallurgy , inert , waste management , mineralogy , environmental science , chemistry , composite material , organic chemistry , engineering , soil science , soil water

Flue gas desulfurization (FGD) gypsum was evaluated as a setting time retarder to replace the natural gypsum in the production of Portland cement (CP II E-32). The results of physical-chemistry and morphological characterization of both products showed a material of high purity, calcium sulfate dehydrate for natural gypsum, and higher percentages of bassanite (CaSO 4 ·0.6H 2 O) and hannebachite (CaSO 3 ·0.5H 2 O) with low concentrations of impurities for FGD gypsum. Based on the results, the FGD gypsum is a suitable alternative to replace natural gypsum. The setting time with FGD gypsum showed about 1 h delay compared with natural gypsum and its effect on compressive strength depend on composition of the mixtures, reaching a maximum value for the mixture of 1.4 wt% natural gypsum and 2.1 wt% FGD gypsum. According to the results of leaching and solubilization tests FGD gypsum residue was classified as a non-hazardous and non-inert.

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