Journal of Urban Science (도시과학)

Urban Science Institute (인천대학교 도시과학연구원)
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Effects of pre-curing periods on pore structures of ordinary Portland cement pastes with calcium silicate cement powder

  • Kim, Gwang Mok
  • Published : 2023.06.30
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Abstract

The cement industry is a major source of carbon dioxide emissions. Reduction in emissions in this sector is an important issue. Calcium silicate cement is a type of alternative to ordinary Portland cements which contributes to the reduction in carbon dioxide emissions. However, because the type of cement is a non-hydraulic material, there are limitations to its application in the field. The effects of pre-curing periods on the physical characteristics of ordinary Portland cement pastes with calcium silicate cement in the present study were investigated. The Independent variable is the pre-curing period. The pre-curing period varied from 0 to 5 hrs, considering the hydration characteristics of ordinary Portland cement. The carbonation curing of the ordinary Portland cement pastes with the calcium silicate cement after pre-curing was conducted. The concentration of gaseous CO2 was fixed at 20 %. The test results showed that the pre-curing period led to the pore structural change of the pastes, which in turn could affect the further reaction under the long-term curing condition.

Keywords

Acknowledgement

This work was supported by the Industrial Strategic technology development program-Development of manufacturing technology of hardened cement with carbonation curing (RS-2022-00155662, Development of manufacturing and application technology of 1,000 ton/year class hardened cement with carbonation curing) funded By the Ministry of Trade, Industry & Energy (MOTIE, Korea).

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