Modification of chitosan as chemical admixture for cement pastes

Lyazzat Bekbayeva1, El-Sayed Negim, Yeligbayeva G, Esmaiel Ganjian

    Research output: Contribution to journalArticlepeer-review

    Abstract

    THREE in the presence different of composition potassium ratios persulphate of chitosan-g- as an initiator acrylic using acid, P[Ch-g-AA] free radical technique. were prepared The grafted copolymers were characterized through FT-IR, TGA, DSC, and SEM. The results showed that these grafted copolymers have a single glass transition indicating that these copolymers can form a miscible phase. The P[Ch-g-AA] exhibit thermal stability. SEM of the grafted copolymers showed no phase separation, when compared with the pure Ch. The effect of grafted copolymers on the physico-mechanical properties of cement pastes was investigated. The addition of water mixed with grafted copolymer to the cement, improves properties of cement pastes. As the ratios of AA in the grafted copolymer increases, the water-to-cement (WC) ratio, setting time as well as water absorption decreases. While The compressive strength was sharply increased at nearly all hydration ages.

    Original languageEnglish
    Article number24
    Pages (from-to)1497-1508
    Number of pages12
    JournalEgyptian Journal of Chemistry
    Volume63
    Issue number4
    DOIs
    Publication statusPublished - 28 Jun 2020

    Bibliographical note

    Free access article

    Keywords

    • Chitosan
    • Acrylic acid
    • Grafting polymerization
    • Portland Cement

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