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Title: Effect of tartaric acid on hydration of a sodium-metasilicate-activated blend of calcium aluminate cement and fly ash F
Authors: Pyatina, T
Sugama, T
Moon, J 
James, S
Keywords: C (programming language)
Calcium compounds
Cement additives
Compressive strength
Computerized tomography
Fly ash
Geothermal wells
Mechanical properties
Metal ions
Phase composition
Scanning electron microscopy
Thermogravimetric analysis
X ray diffraction
X ray spectroscopy
Aggressive environment
Alkali activated cements
Attractive solutions
Calcium aluminate cement
Increasing temperatures
Strength development
X-ray computed tomography
Issue Date: 2016
Publisher: MDPI AG
Citation: Pyatina, T, Sugama, T, Moon, J, James, S (2016). Effect of tartaric acid on hydration of a sodium-metasilicate-activated blend of calcium aluminate cement and fly ash F. Materials 9 (6) : 422. ScholarBank@NUS Repository.
Rights: Attribution 4.0 International
Abstract: 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 ?m) and greater compressive strength after 300 °C curing. Mechanical properties of the set cements were not compromised by the retarder.
Source Title: Materials
ISSN: 1996-1944
DOI: 10.3390/ma9060422
Rights: Attribution 4.0 International
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