Modification of chitosan as chemical admixture for cement pastes

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

Research output: Contribution to journalArticle

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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