• Title/Summary/Keyword: fast-harding cement

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Mineral and Compressive Strength Characteristics of Calcium Silicate and Calcium Sulfoaluminate Mixed Cement in Carbon Dioxide Atmosphere (이산화탄소 분위기에서 칼슘실리케이트와 칼슘설포알루미네이트 혼합시멘트의 광물 및 압축강도 특성)

  • Dae-geun Lee;Sun-Mok Lee;Jung-Jun Park;Ki-Yeon Moon;Kye-Hong Cho;Jin-Sang Cho
    • Resources Recycling
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    • v.32 no.6
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    • pp.10-17
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    • 2023
  • Calcium silicate cement (CSC) is an environmentally sustainable, low-carbon cement and has garnered significant attention in recent studies. However, the pre-curing step required to activate the carbon dioxide reaction and to handle the sample. This study aimed to examine the viability of extending the application of CSC without pre-curing by enhancing initial strength by mixing calcium sulfoaluminate (CSA) fast-hardening cement into CSC. The investigation assessed changes in compression strength and Q-XRD mineral characteristics concerning variations in the mixing ratio of CSC and CSA fast-hardening cement within a carbon dioxide atmosphere. The compressive strength results indicated that the 3-day and 7-day strengths were 14.18 MPa and 22.98 MPa, respectively, under the 50% CSC condition, meeting the type 1 cement KS standard. Mineral characteristics analysis revealed an increase in calcite mineral, a byproduct of the carbon dioxide reaction, contributing to strength enhancement. Even after seven days, substantial quantities of unreacted rankinitene and pseudowollastonite were observed, as well as dicalcium silicate and yeelimite, which are hydrated minerals. This observation was confirmed the possibility of strength improvement after 7 days.