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Open AccessArticle

Effect of Tartaric Acid on Hydration of a Sodium-Metasilicate-Activated Blend of Calcium Aluminate Cement and Fly Ash F

1
Brookhaven National Laboratory, Upton, NY 11973-5000, USA
2
Department of Civil & Environmental Engineering, National University of Singapore, 1 Engineering Drive 2, Singapore 117576, Singapore
3
Schlumberger Riboud Product Center, 1 rue Henri Becquerel, Clamart 92140, France
*
Author to whom correspondence should be addressed.
Academic Editor: Claudio Ferone
Materials 2016, 9(6), 422; https://doi.org/10.3390/ma9060422
Received: 26 April 2016 / Revised: 20 May 2016 / Accepted: 23 May 2016 / Published: 27 May 2016
(This article belongs to the Special Issue Advances in Geopolymers and Alkali-Activated Materials)
An alkali-activated blend of aluminum cement and class F fly ash is an attractive solution for geothermal wells where cement is exposed to significant thermal shocks and aggressive environments. Set-control additives enable the safe cement placement in a well but may compromise its mechanical properties. This work evaluates the effect of a tartaric-acid set retarder on phase composition, microstructure, and strength development of a sodium-metasilicate-activated calcium aluminate/fly ash class F blend after curing at 85 °C, 200 °C or 300 °C. The hardened materials were characterized with X-ray diffraction, thermogravimetric analysis, X-ray computed tomography, and combined scanning electron microscopy/energy-dispersive X-ray spectroscopy and tested for mechanical strength. With increasing temperature, a higher number of phase transitions in non-retarded specimens was found as a result of fast cement hydration. The differences in the phase compositions were also attributed to tartaric acid interactions with metal ions released by the blend in retarded samples. The retarded samples showed higher total porosity but reduced percentage of large pores (above 500 µm) and greater compressive strength after 300 °C curing. Mechanical properties of the set cements were not compromised by the retarder. View Full-Text
Keywords: calcium aluminate cement; alkali activated cement; fly ash; retardation; microstructure calcium aluminate cement; alkali activated cement; fly ash; retardation; microstructure
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Pyatina, T.; Sugama, T.; Moon, J.; James, S. Effect of Tartaric Acid on Hydration of a Sodium-Metasilicate-Activated Blend of Calcium Aluminate Cement and Fly Ash F. Materials 2016, 9, 422.

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