In this work, ultra-fine calcium oxide (CaO) powder derived from eggshells is used as the starting material to synthesize mineral trioxide aggregate (MTA). The prepared CaO powder is confirmed to have an average particle size of 500 nm. MTAs are synthesized with three types of fine CaO-based powders, namely, tricalcium silicate (C3S), dicalcium silicate (C2S), and tricalcium aluminate (C3A). The synthesis behavior of C3S, C2S and C3A with ultra-fine CaO powder and the effects of C3A content and curing time on the properties of MTA are investigated. The characteristics of the synthesized MTA powders are examined by X-ray diffraction (XRD), field emission-scanning electron microscope (FE-SEM), and a universal testing machine (UTM). The microstructure and compressive strength characteristics of the synthesized MTA powders are strongly dependent on the C3A wt.% and curing time. Furthermore, MTA with 5 wt.% C3A is found to increase the compressive strength and shorten the curing time.

Abstract
1. 서 론
2. 실험방법
    2.1 난각을 이용한 초미립 CaO 분말 제조
    2.2 C3S, C2S, C3A 합성분말 제조
    2.3 특성분석
3. 결과 및 고찰
4. 결 론
References

• 공헌(국립목포대학교 세라믹산업기술연구소) | Heon Kong (The Research Institute of Ceramic Industry Technology in Mokpo National University)
• 권기범(드림소재(주)) | Ki-Beom Kwon (Research Center, Dreamsojae Co., Ltd)
• 박상진(드림소재(주)) | Sang-Jin Park (Research Center, Dreamsojae Co., Ltd)
• 노효섭(드림소재(주)) | Whyo-Sub Noh (Research Center, Dreamsojae Co., Ltd)
• 이상진(국립목포대학교 세라믹산업기술연구소/국립목포대학교 신소재공학과) | Sang-Jin Lee (The Research Institute of Ceramic Industry Technology in Mokpo National University/Department of Advanced Materials and Engineering, Mokpo National University) Corresponding Author