서지주요정보
칼시아의 수화반응에 미치는 표면탄화의 영향에 관한 연구 = A study on the effect of the surface carbonation on the hydration of CaO
서명 / 저자 칼시아의 수화반응에 미치는 표면탄화의 영향에 관한 연구 = A study on the effect of the surface carbonation on the hydration of CaO / 송한식.
저자명 송한식 ; Song, Han-Sik
발행사항 [대전 : 한국과학기술원, 1991].
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소장정보

등록번호

8001677

소장위치/청구기호

학술문화관(문화관) 보존서고

DMS 9107

휴대폰 전송

도서상태

이용가능

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반납예정일

초록정보

CaO rapidly reacts with water, even with vapor phase. to control the hydration rate of CaO, several methods have been suggested. In the present work, the effect of carbonation on the hydration of CaO was studied. Densified CaO powder between $44-88 \mu m$ particle size was prepared by sintering $Ca(OH)_2$ and subsquent grinding, sieving. Carbonation reaction was performed at 300, 500, and 700℃ for 30 min, 1 hr, and 4 hr. Carbonation at 300℃ which had cracked surface because of anisotropic $Ca(OH)_3$ formation did not influence on the hydration of CaO. As carbonation temperature was increased above 500℃, the external surface of CaO was covered with well developed $CaCO_3$ coating layer without crack formation. The protective $CaCo_3$ coating layer made induction period before CaO began to Hydrate. The thicker the depth of $CaCO_3$ layer, the longer the induction period. Namely, $1\mu m$ thickness of $CaCo_3$ coating later made about 110 min induction period. It was found that the determining mechanism of induction period to be the diffusion of $H_2O$ through $CaCO_3$ layer. The hydration procedure was investigated by methanol treatment, leading to the observation by SEM. Within induction period, the external shape of the carbonated surface had not changed. Beyond the induction period, the coating layer was broken like chapped shin and showed granular shape of $Ca(OH)_2$ crystal. These results were well coincident with the heat of hydration tests. From the above results, the idealized hydration model of carbonated CaO was presented.

서지기타정보

서지기타정보
청구기호 {DMS 9107
형태사항 iv, 92 p. : 삽도 ; 26 cm
언어 한국어
일반주기 부록 : 1, CaO의 분포 계산. - 2, Coating 층의 두께 계산. - 3, Cement clinker 의 광물 계산 방법(Bogue equation)
저자명의 영문표기 : Han-Sik Song
지도교수의 한글표기 : 김종희
지도교수의 영문표기 : Chong-Hee Kim
학위논문 학위논문(박사) - 한국과학기술원 : 재료공학과,
서지주기 참고문헌 : p. 78-83
주제 수화 (화학) --과학기술용어시소러스
산화칼슘 --과학기술용어시소러스
탄산칼슘 --과학기술용어시소러스
Hydration
Calsium carbonate
Calsium oxide
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