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Home > Publications > International Concrete Abstracts Portal
The International Concrete Abstracts Portal is an ACI led collaboration with leading technical organizations from within the international concrete industry and offers the most comprehensive collection of published concrete abstracts.
Title: Phase Evolution of Oil Well Cements with Nano-Additive at Elevated Temperature/Pressure
Author(s): Siwei Ma, Tony Yu, Yanbin Wang, Mohend Chaouche, and Shiho Kawashima
Publication: Materials Journal
Appears on pages(s): 571-578
Keywords: high pressure; high temperature; nanomaterials; oil well cement; synchrotron; X-ray diffraction
Abstract:Phase characterization of Class A oil well cement slurries was performed through synchrotron X-ray diffraction technique. This allowed for real-time, in-place measurements of X-ray diffraction patterns to be obtained and, subsequently, the continuous formation and decomposition of select phases over time (up to 8 hours). Phases of interest included alite, ferrite, portlandite, ettringite, monosulfate, and jaffeite (crystalline form of calcium silicate hydrate). The effects of elevated temperatures (140, 185, and 300°F [60, 85, and 149°C]) at elevated pressure (up to approximately 15 ksi [100 MPa]), as well as the effect of nanomaterial addition were investigated. Rate of conversion of ettringite to monosulfate increased with increasing temperature, and monosulfate became unstable when temperatures reached 185°F (85°C). The results of synchrotron X-ray diffraction provided evidence of a seeding effect introduced by nano-sized attapulgite clays at 0.5% addition by mass of cement, where acceleration in the rate of formation of portlandite and jaffeite was observed. This was supported by isothermal calorimetry results.
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