Konjac Glucomannan Induced Retarding Effects on the Early Hydration of Cement

Yushan Chen, Pengfei Tang, Chen Zhong, Laibao Liu, Yunsheng Zhang, Youhong Tang, Hongping Zhang

Research output: Contribution to journalArticlepeer-review

5 Citations (Scopus)
23 Downloads (Pure)

Abstract

Customarily, retarders serve as the setting time regulators of cement-based composites to meet the demands of various construction environments. However, the limited ability to adjust the setting time restricts the application of polysaccharides in special environments. In this study, we reported a naturally high-efficiency retarder, konjac glucomannan (KGM), and studied the mechanism of its effect on the hydration of ordinary Portland cement. Incorporating KGM could significantly prolong cement hydration without strength damage. Furthermore, the active hydroxyl group (−OH, rich in KGM) could chelate with Ca2+ (released from cement hydration) to form a cross-linking network, which is adsorbed on the surface of cement clinker, thereby being conducive to delaying the process of cement hydration and reducing the heat of hydration. The findings of this study are critical to the ongoing efforts to develop polysaccharide-cement-based composite materials for application in various special environments.

Original languageEnglish
Article number1064
Number of pages13
JournalPolymers
Volume14
Issue number5
DOIs
Publication statusPublished - 1 Mar 2022

Keywords

  • Hydration kinetics
  • Interaction mechanism
  • Konjac glucomannan
  • Setting time regulator

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