Plaster materials from waste calcium sulfate containing chemicals, organic fibers and inorganic additives

P. Chindaprasirt, K. Boonserm, T. Chairuangsri, W. Vichit-Vadakan, T. Eaimsin, T. Sato, K. Pimraksa

    Research output: Contribution to journalArticlepeer-review

    21 Citations (Scopus)

    Abstract

    Plaster materials made of waste gypsum or flue-gas-desulferized (FGD) gypsum with chemicals;organic and inorganic additives were studied. Glucose;citric acid and sodium bicarbonate were incorporated to retard the hydration of plaster. Saw dust (SD);coconut fibers (CCF) and tobacco waste fiber (TWF) were incorporated to improve the thermal property. Diatomaceous earth (DE);fly ash (FA) and bottom ash (BA) were incorporated to improve the mechanical and thermal properties. Citric acid;TWF;sodium bicarbonate and glucose could be used to retard the setting time of fresh FGD-plaster to approximately 25 min comparable to that of commercial plaster while the other additives did not retard the hydration. In presences of these retarding additives;needle shaped gypsum changed into lower aspect ratio particles. SD;CCF;DE;FA and BA modified gypsum crystal growth and reduced the crystal length. These changes in morphology consequently gave significant alterations of mechanical and thermal properties of the materials. The additions of organic and inorganic additives resulted in a reduction of bulk density and increases in water absorption;and similar strength compared to commercial gypsum. A good thermal insulating property was obtained from the samples with the incorporation of coconut fiber;BA and DE. In addition;these samples had a good performance in fire proof.

    Original languageEnglish
    Pages (from-to)3193-3203
    Number of pages11
    JournalConstruction and Building Materials
    Volume25
    Issue number8
    DOIs
    Publication statusPublished - 2011 Aug

    Keywords

    • Gypsum
    • Hydration
    • Organic and inorganic additives
    • Plaster
    • Porous materials

    ASJC Scopus subject areas

    • Civil and Structural Engineering
    • Building and Construction
    • Materials Science(all)

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