Effects of calcined dolomite addition on reaction kinetics of one-part sodium carbonate-activated slag cements

Yang, Tao and Zhang, Zuhua and Zhu, Huajun and Zhang, Wei and Gao, Yanan and Zhang, Xiaocheng and Wu, Qisheng (2019) Effects of calcined dolomite addition on reaction kinetics of one-part sodium carbonate-activated slag cements. Construction and Building Materials, 211. pp. 329-336. ISSN 0950-0618

Abstract

In the present study, an environment-friendly one-part alkali-activated cement dry mixture was prepared by using blast furnace slag as the aluminosilicate precursor, solid sodium carbonate as the alkali activator and calcined dolomite (CD) as the reaction kinetics controlling additive. The effects of CD addition on the reaction kinetics and phase evolution of the hydrated cement paste were investigated by using the isothermal conduction calorimetry (ICC), X-ray diffractometry (XRD), thermogravimetric analysis (TGA) and nitrogen adsorption technique. The CD addition promoted the formation of hydrotalcite-like phase in the paste to consume the excess CO32− ions. This is helpful in raising the alkalinity of the pore solution, and consequently enhancing the rate and degree of the alkali-activation. The growth of space-filling C-A-S-H gel phase leads to a more compact pore structure in the paste with higher CD content. The CD addition enables the Na2CO3-activated slag paste to set within 24 h, and improves the compressive strength to an acceptable value of 32.9–41.6 MPa after 28 days of curing at ambient temperature.


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Item Type: Article (Commonwealth Reporting Category C)
Refereed: Yes
Item Status: Live Archive
Additional Information: Files associated with this item cannot be displayed due to copyright restrictions.
Faculty/School / Institute/Centre: Current - Institute for Advanced Engineering and Space Sciences - Centre for Future Materials (1 Jan 2017 -)
Faculty/School / Institute/Centre: Current - Institute for Advanced Engineering and Space Sciences - Centre for Future Materials (1 Jan 2017 -)
Date Deposited: 24 Jan 2020 02:07
Last Modified: 30 Jan 2020 02:54
Uncontrolled Keywords: Alkali-activated cement, One-part geopolymer, Sodium carbonate, Calcined dolomite, Pore structure
Fields of Research : 09 Engineering > 0905 Civil Engineering > 090503 Construction Materials
Socio-Economic Objective: B Economic Development > 87 Construction > 8703 Construction Materials Performance and Processes > 870301 Cement and Concrete Materials
Funding Details:
Identification Number or DOI: 10.1016/j.conbuildmat.2019.03.245
URI: http://eprints.usq.edu.au/id/eprint/37693

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