Zobrazeno 1 - 10
of 118
pro vyhledávání: '"Toshifumi Sugama"'
Autor:
Tatiana Pyatina, Toshifumi Sugama, Al Moghadam, Marcel Naumann, Ragnhild Skorpa, Blandine Feneuil, Vincent Soustelle, Rune Godøy
Publikováno v:
Materials, Vol 17, Iss 6, p 1320 (2024)
High-temperature (HT) geothermal wells can provide green power 24 hours a day, 7 days a week. Under harsh environmental and operational conditions, the long-term durability requirements of such wells require special cementitious composites for well c
Externí odkaz:
https://doaj.org/article/7c560a57c2b14e2cbac47ee3a69b5424
Autor:
Toshifumi Sugama, Tatiana Pyatina
Publikováno v:
Materials, Vol 16, Iss 17, p 5792 (2023)
Energy losses can be significantly reduced if thermally insulating cement is used for energy storage and recovery. The thermal conductivity (TC) of the currently used cement is between 1 and 1.2 W/mK. In this study we assessed the ability of polystyr
Externí odkaz:
https://doaj.org/article/273f590dce844dd3b8bbf9d4c0f61aaf
Autor:
Toshifumi Sugama, Tatiana Pyatina
Publikováno v:
Materials, Vol 15, Iss 18, p 6328 (2022)
This paper presents the use of hydrophobic silica aerogel (HSA) and hydrophilic fly ash cenosphere (FCS) aggregates for improvements in the thermal insulating and mechanical properties of 100- and 250 °C-autoclaved calcium aluminate phosphate (CaP)
Externí odkaz:
https://doaj.org/article/c5e4530d2b274411988d112c1f76429b
Autor:
Toshifumi Sugama, Tatiana Pyatina
Publikováno v:
Materials, Vol 14, Iss 21, p 6679 (2021)
This study assessed the possibility of using polymethylhydrosiloxane (PMHS)-treated fly ash cenospheres (FCS) for formulating a thermally insulating and thermal shock (TS)-resistant cementitious blend with calcium aluminate cement. To prevent FCS deg
Externí odkaz:
https://doaj.org/article/f723074a7aed4fc390ddcbb3b07ec95b
Publikováno v:
Materials, Vol 9, Iss 6, p 422 (2016)
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
Externí odkaz:
https://doaj.org/article/172729bc06884f9cabd8d3dc295ada94
Autor:
Tatiana Pyatina, Toshifumi Sugama
Publikováno v:
Materials
Volume 14
Issue 21
Materials, Vol 14, Iss 6679, p 6679 (2021)
Volume 14
Issue 21
Materials, Vol 14, Iss 6679, p 6679 (2021)
This study assessed the possibility of using polymethylhydrosiloxane (PMHS)-treated fly ash cenospheres (FCS) for formulating a thermally insulating and thermal shock (TS)-resistant cementitious blend with calcium aluminate cement. To prevent FCS deg
Autor:
Toshifumi Sugama, Tatiana Pyatina
Publikováno v:
Cement and Concrete Composites. 99:1-16
This study assesses the ability of calcium aluminate phosphate (CAP)/fly ash F (FAF) blend composite to self-heal at early age; to re-adhere to the casing surfaces after debonding and to protect carbon steel (CS) against brine-caused corrosion before
Publikováno v:
Advances in Cement Research. 30:8-23
The 10 d recoveries of the mechanical properties and crack sealing of an ordinary Portland cement (OPC) clinker/natural zeolite (ferrierite (Fer)) blend modified or unmodified with silica were tested at 270°C in water and alkali carbonate environmen
Autor:
Tatiana Pyatina, Toshifumi Sugama
Publikováno v:
Geothermics. 96:102068
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 (
Autor:
Tatiana Pyatina, Mathias C. Celina, Nicholas Henry Giron, Charles E. Harris, Toshifumi Sugama, Erica Marie Redline
Publikováno v:
Polymer Degradation and Stability. 146:317-326
Previous observation of EPDM and FEPM materials aged in thermo-oxidative and thermo-oxidative plus hydrolytic environments revealed an unusual trend: the degradation and disintegration of these polymers in the former case but the ability to maintain