| 논문명 |
Formation of Hydroxyapatite in Portland Cement Paste |
| 저자명 |
Chung, Chul-Woo ; Lee, Jae-Yong ; Kim, Ji-Hyun |
| 발행사 |
한국건축시공학회 |
| 수록사항 |
한국건축시공학회 논문집, v.14 n.1 (2014-02) |
| 페이지 |
시작페이지(68) 총페이지(8) |
| ISSN |
15982033 |
| 주제분류 |
시공(적산) |
| 주제어 |
//portland cement ; calcium phosphate ; hydroxyapatite ; geologic sequestration ; carbon dioxide |
| 요약2 |
In order to increase the integrity of the wellbore which is used to prevent the leakage of supercritical CO2, it is necessary to develop a concrete that is strongly resistant to carbonation. In an environment where the concentration of CO2 is exceptionally high, Ca2+ 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. |
| 소장처 |
한국건축시공학회 |