지원사업
학술연구/단체지원/교육 등 연구자 활동을 지속하도록 DBpia가 지원하고 있어요.
커뮤니티
연구자들이 자신의 연구와 전문성을 널리 알리고, 새로운 협력의 기회를 만들 수 있는 네트워킹 공간이에요.
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초록· 키워드
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In order to increase the integrity of the wellbore which is used to prevent the leakage of supercritical $CO_2$, it is necessary to develop a concrete that is strongly resistant to carbonation. In an environment where the concentration of $CO_2$ is exceptionally high, $Ca^{2+}$ ion concentration in pore solution of Portland cement concrete will drop significantly due to the rapid consumption of calcium hydroxide, which decreases the stability of the calcium silicate hydrate. In this research, calcium phosphates were used to modify Portland cement system in order to produce hydroxyapatite, a hydration product that is strongly resistant to carbonation under such an environment. According to the experimental results, calcium phosphates reacted with Portland cement to form hydroxyapatite. The formation of hydroxyapatite was verified using X-ray diffraction analyses with selective extraction techniques. When using dicalcium phosphate dihydrate and tricalcium phosphate, the 28-day compressive strength was lower than that of plain cement paste. However, the specimen with monocalcium phosphate monohydrate showed equivalent strength to that of plain cement paste.
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참고문헌 (13)
참고문헌 신청
Mindess S / 2003 / Concrete / Prentice Hall :644
Mehta PK / 2005 / Concrete Microstructure, Properties, and Materials. 3rd ed / McGraw Hill :659
Taylor HFW / 1997 / Cement Chemistry / Thomas Telford Services Ltd :459
Krupka KM / 2010 / Thermodynamic Data for Geochemical Modeling of Carbonate Reactions Associated with CO2 Sequestration–Literature Review :135
Kutchko BG / 2008 / Rate of CO2 attack on hydrated Class H well cement under geologic sequestration conditions / Environmental Science and Technology 42(16):6237~6242
Mehta PK / 2005 / Concrete Microstructure, Properties, and Materials. 3rd ed / McGraw Hill :659
Taylor HFW / 1997 / Cement Chemistry / Thomas Telford Services Ltd :459
Krupka KM / 2010 / Thermodynamic Data for Geochemical Modeling of Carbonate Reactions Associated with CO2 Sequestration–Literature Review :135
Kutchko BG / 2008 / Rate of CO2 attack on hydrated Class H well cement under geologic sequestration conditions / Environmental Science and Technology 42(16):6237~6242
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