Toughness Improvement of Geothermal Well Cement at up to 300°C: Using Carbon Microfiber

DOI: 10.4236/ojcm.2014.44020   PDF   HTML     3,886 Downloads   4,484 Views   Citations

Abstract

This study aimed at assessing the usefulness of carbon microfiber (CMF) in improving the compressive-toughness of sodium metasilicate-activated calcium aluminate/Class F fly ash foamed cement at hydrothermal temperatures of up to 300°C. When the CMFs came in contact with a pore solution of cement, their surfaces underwent alkali-caused oxidation, leading to the formation of metal (Na, Ca, Al)-complexed carboxylate groups. The extent of this oxidation was enhanced by the temperature increase, corresponding to the incorporation of more oxidation derivatives at higher temperatures. Although micro-probe examinations did not show any defects in the fibers, the enhanced oxidation engendered shrinkage of the interlayer spacing between the C-basal planes in CMFs, and a decline in their thermal stability. On the other hand, the complexed carboxylate groups present on the surfaces of oxidized fibers played a pivotal role in improving the adherence of fibers to the cement matrix. Such fiber/cement interfacial bonds contributed significantly to the excellent bridging effect of fibers, resistance to the cracks development and propagation, and to improvement of the post-crack material ductility. Consequently, the compressive toughness of the 85°-, 200°-, and 300°C-autoclaved foamed cements reinforced with 10 wt% CMF was 2.4-, 2.9-, and 3.1-fold higher than for cement without the reinforcement.

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Sugama, T. and Pyatina, T. (2014) Toughness Improvement of Geothermal Well Cement at up to 300°C: Using Carbon Microfiber. Open Journal of Composite Materials, 4, 177-190. doi: 10.4236/ojcm.2014.44020.

Conflicts of Interest

The authors declare no conflicts of interest.

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