4.7 Article

Konjac Glucomannan Induced Retarding Effects on the Early Hydration of Cement

期刊

POLYMERS
卷 14, 期 5, 页码 -

出版社

MDPI
DOI: 10.3390/polym14051064

关键词

konjac glucomannan; setting time regulator; hydration kinetics; interaction mechanism

资金

  1. National Natural Science Foundation of China [52178253]
  2. China Postdoctoral Science Foundation [2021M692691]

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This study reported a naturally high-efficiency retarder, konjac glucomannan (KGM), which could significantly prolong cement hydration without strength damage. The active hydroxyl group (-OH) in KGM could chelate with Ca2+ released from cement hydration to form a cross-linking network, thereby delaying the process of cement hydration and reducing the heat of hydration. The findings of this study are critical to the development of polysaccharide-cement-based composite materials for application in various special environments.
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.

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