On the Rapid Hardening Cement (II)

,; ,; ,; ,; ,; ,; ,; ,

J. Korean Ceram. Soc. > Volume 12(4); 1975 > Article

Journal of the Korean Ceramic Society 1975;12(4): 3.

초속경시멘트 제조에 관한 연구(제2보 수화반응)

한기성, 최상흘¹, 한상목¹, 서일영¹

인하대 요업과
¹한양대 요업과

On the Rapid Hardening Cement (II)

ABSTRACT

Hydration processes of the rapid hardening cement clinkers, which were synthesized from domestic alunite for major alumina source, limestone, kaolin and fluorite, were investigated by means of x-ray diffraction analysis, thermal analysis and microscopic observation etc. The clinkers were composed mainly of alite, calcium fluroaluminate (C11A7.CaF2) minerals. While the hydratio processes of the clinkers are altered by concentration of SO3 in the paste, calcium aluminate hydrates such as C4AH13, CAH10 and calcium monosulfate hydrate (C3A.CaSO4.12H2O) are formed at first and then some of them are transformed into ettringite(C3A.3CaSO4.32H2O) within 30~60 min. when the concentration of SO3 in the paste are enough. However the formed ettringite are changed slowly into calcium monosulfate hydrate as the concentration of SO3 become lowered, and the paste is hardened with these close-packed minerals. When the content of SO3 in clinker is so enough, calcium sulfoaluminate hydrates are found without any addition of anhydrite or hemi-hydrite.