Effects of calcined dolomite addition on reaction kinetics of one-part sodium carbonate-activated slag cements
Article
Article Title | Effects of calcined dolomite addition on reaction kinetics of one-part sodium carbonate-activated slag cements |
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ERA Journal ID | 3470 |
Article Category | Article |
Authors | Yang, Tao, Zhang, Zuhua, Zhu, Huajun, Zhang, Wei, Gao, Yanan, Zhang, Xiaocheng and Wu, Qisheng |
Journal Title | Construction and Building Materials |
Journal Citation | 211, pp. 329-336 |
Number of Pages | 16 |
Year | 2019 |
Publisher | Elsevier |
Place of Publication | Netherlands |
ISSN | 0950-0618 |
Digital Object Identifier (DOI) | https://doi.org/10.1016/j.conbuildmat.2019.03.245 |
Web Address (URL) | https://www.sciencedirect.com/science/article/pii/S0950061819307342#ak005 |
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. |
Keywords | Alkali-activated cement, One-part geopolymer, Sodium carbonate, Calcined dolomite, Pore structure |
ANZSRC Field of Research 2020 | 400505. Construction materials |
Public Notes | Files associated with this item cannot be displayed due to copyright restrictions. |
Byline Affiliations | Yancheng Institute of Technology, China |
Centre for Future Materials | |
Nanjing Tech University, China | |
Institution of Origin | University of Southern Queensland |
Funding source | Grant ID DE170101070 |
https://research.usq.edu.au/item/q5870/effects-of-calcined-dolomite-addition-on-reaction-kinetics-of-one-part-sodium-carbonate-activated-slag-cements
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