Effect of welan gum on the hydration and hardening of Portland cement

Zhang, Yu and Zhang, Zuhua and Li, Xuerun and Li, Weifeng and Shen, Xiaodong and Wang, Hao (2018) Effect of welan gum on the hydration and hardening of Portland cement. Journal of Thermal Analysis and Calorimetry, 131 (2). pp. 1277-1286. ISSN 1388-6150

Abstract

This paper reports the effects of welan gum on the hydration and hardening behaviors of Portland cement (PC) by using X-ray diffractometry, mercury instruction porosimetry, thermogravimetry, differential scanning calorimetry and scanning electron microscopy. Results show that welan gum has notable influence on the setting time of PC paste and the formation of calcium hydroxide (Ca(OH)2); welan gum has little impact on the total hydration heat, AFt content and/or the morphologies of hydration products even though it delays the induction period of hydration and the second reaction of the aluminate phase. Welan gum retards the early hydration of C3S and accelerates the early hydration of C4AF. The compressive strength is improved, and pore size of hardened cement paste is reduced with at the studied period when welan gum is no more than 0.05%. In this research, the cement paste with 0.05% welan gum exhibits the highest long-term (90 d) compressive strength and lowest porosity.


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Item Type: Article (Commonwealth Reporting Category C)
Refereed: Yes
Item Status: Live Archive
Additional Information: Permanent restricted access to Published version, in accordance with the copyright policy of the publisher.
Faculty/School / Institute/Centre: Current - Institute for Advanced Engineering and Space Sciences - Centre for Future Materials
Date Deposited: 31 Jan 2019 05:06
Last Modified: 05 Feb 2019 02:13
Uncontrolled Keywords: welan gum; hydration; Portland cement; retarding effect; compressive strength
Fields of Research : 09 Engineering > 0912 Materials Engineering > 091202 Composite and Hybrid Materials
Funding Details:
Identification Number or DOI: 10.1007/s10973-017-6589-5
URI: http://eprints.usq.edu.au/id/eprint/35296

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