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Materials 2017, 10(4), 342; doi:10.3390/ma10040342

Role of Tartaric Acid in Chemical, Mechanical and Self-Healing Behaviors of a Calcium-Aluminate Cement Blend with Fly Ash F under Steam and Alkali Carbonate Environments at 270 °C

Brookhaven National Laboratory, Upton, NY 11973-5000, USA
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Author to whom correspondence should be addressed.
Academic Editor: Jorge de Brito
Received: 1 February 2017 / Revised: 14 March 2017 / Accepted: 17 March 2017 / Published: 25 March 2017
(This article belongs to the Section Advanced Composites)
View Full-Text   |   Download PDF [3197 KB, uploaded 25 March 2017]   |  

Abstract

Tartaric acid (TA) changes short-term mechanical behavior and phase composition of sodium-metasilicate activated calcium-aluminate cement blend with fly ash, type F, when used as a set control additive to allow sufficient pumping time for underground well placement. The present work focuses on TA effect on self-healing properties of the blend under steam or alkali carbonate environments at 270 °C applicable to geothermal wells. Compressive strength recoveries and cracks sealing were examined to evaluate self-healing of the cement after repeated crush tests followed by two consecutive healing periods of 10 and 5 days at 270 °C. Optical and scanning electron microscopes, X-ray diffraction, Fourier Transform infrared and EDX measurements along with thermal gravimetric analyses were used to identify phases participating in the healing processes. Samples with 1% mass fraction of TA by weight of blend demonstrated improved strength recoveries and crack plugging properties, especially in alkali carbonate environment. This effect was attributed to silicon-rich (C,N)-A-S-H amorphous phase predominant in TA-modified samples, high-temperature stable zeolite phases along with the formation of tobermorite-type crystals in the presence of tartaric acid. View Full-Text
Keywords: calcium aluminate cement; self-healing cement; alkali activated cement; fly ash; retardation; microstructure calcium aluminate cement; self-healing cement; alkali activated cement; fly ash; retardation; microstructure
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Pyatina, T.; Sugama, T. Role of Tartaric Acid in Chemical, Mechanical and Self-Healing Behaviors of a Calcium-Aluminate Cement Blend with Fly Ash F under Steam and Alkali Carbonate Environments at 270 °C. Materials 2017, 10, 342.

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