Upgrading of Waste Gypsum for Building Materials

Piyalak Ngernchuklin; Nestchanok Yongpraderm; Arjin Boonruang; Sittichai Kanchanasutha; Pracha Laoauyporn; Chumphol Busabok

doi:10.4028/www.scientific.net/KEM.766.211

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HomeKey Engineering MaterialsKey Engineering Materials Vol. 766Upgrading of Waste Gypsum for Building Materials

Upgrading of Waste Gypsum for Building Materials

Abstract:

In this research, waste gypsum (CaSO₄·2H₂O), a by-product material from industrial factory, was upgraded and then used as raw material for building materials. The by-product gypsum possessed a high acidic value of 3-point pH scale and moisture content of 40 %. The two properties had an impact on setting reaction and hardening of gypsum. Therefore, the studies of gypsum phase transformation to calcium sulfate hemihydrate (CaSO₄·0.5H₂O) were focused on washing process and amount of calcium carbonate (CaCO₃) added at 0, 1, 3 and 5 % wt. After washing, waste gypsum and washed water were reduced from high acidic value to neutralization (pH = 7) as a result of CaCO_3.Next, the neutralized gypsum was heated to the optimal temperature at 160 °C for 2 hours and transformed to hemihydrate gypsum phase observed by XRD. Finally, the relationship of amount of CaCO₃-mechanical property such as bending strength will be investigated.

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Periodical:

Key Engineering Materials (Volume 766)

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211-216

DOI:

https://doi.org/10.4028/www.scientific.net/KEM.766.211

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Online since:

April 2018

Authors:

Piyalak Ngernchuklin*, Nestchanok Yongpraderm, Arjin Boonruang, Sittichai Kanchanasutha, Pracha Laoauyporn, Chumphol Busabok

Keywords:

Building Materials, By-Product Gypsum, Hemihydrate Gypsum

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