Self-re-adhering alkali-activated cement composite and its ability to mitigate corrosion of carbon steel in 300 °C hydrothermal environment

Sugama, Toshifumi; Pyatina, Tatiana

doi:10.1016/j.geothermics.2021.102068

Self-re-adhering alkali-activated cement composite and its ability to mitigate corrosion of carbon steel in 300 °C hydrothermal environment

Journal Article · Thu Aug 12 04:00:00 EDT 2021 · Geothermics

DOI:https://doi.org/10.1016/j.geothermics.2021.102068· OSTI ID:1767429

Sugama, Toshifumi ^[1]; Pyatina, Tatiana ^[1]

Brookhaven National Lab. (BNL), Upton, NY (United States)

Cement-steel interface is a weak point of cement sheath integrity under the environments of high-temperature geothermal wells. This paper presents carbon steel (CS) adherence behaviors of 300 °C-autoclaved alkali-activated Calcium-Aluminate-Cement (CAC)/fly ash F (FAF) (Thermal Shock Resistant Cement, TSRC), granulated blast furnace slag (GBFS)/SiO₂, and Ordinary Portland Cement (OPC)/SiO₂ blends. The composites’ ability to preserve the bond under the conditions of thermal shock (TS) and strong acid attack (pH 0.6 H₂SO₄/brine at 90 °C) as well as their ability to recover the damaged bond and provide steel corrosion protection after additional short-time 5-day curing at 300 °C were evaluated. GBFS/SiO₂ sheath underwent catastrophic failure in the first TS cycle; OPC/SiO₂ lost 78 % and TSRC 51 % of the bond strength in 6 cycles. Only TSRC-CS bond survived 30 days of strong acid exposure; OPC/SiO₂ bond failed after 18 days and GBFS/SiO₂ after 20 days. Addition of micro-glass fibers (MGF) to TSRC further improved its bond strength and CS corrosion protection. Samples of TSRC-CS cured for 30 days at 300 °C before the bond damage recovered 49 % of the damaged bond strength after additional short-time curing. The CS protected by the re-adhered TSRC showed low corrosion rate of 0.13 mm/year (TSRC-MGF), 0.2 mm/year (TSRC) vs. 0.64 mm/year for OPC/SiO₂ protected CS.

Research Organization:: Brookhaven National Laboratory (BNL), Upton, NY (United States)

Sponsoring Organization:: USDOE Office of Energy Efficiency and Renewable Energy (EERE), Geothermal Technologies Office; National Science Foundation (NSF)

Grant/Contract Number:: SC0012704; AC02-98CH10886

OSTI ID:: 1767429

Report Number(s):: BNL-221097-2021-JAAM

Journal Information:: Geothermics, Journal Name: Geothermics Vol. 96; ISSN 0375-6505

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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15 GEOTHERMAL ENERGY
acid resistance
alkali-activated cement
cement-carbon steel bond
slag
thermal shock resistance

Self-re-adhering alkali-activated cement composite and its ability to mitigate corrosion of carbon steel in 300 °C hydrothermal environment

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References (11)

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