Journal of Urban Science (도시과학)

Urban Science Institute (인천대학교 도시과학연구원)
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Time-resolved polarization and depolarization tracking on reaction pathway of calcium carbonates in a view of non-classical nucleation theory

비전통핵생성 이론 관점에서 탄산칼슘의 반응경로에 대한 시간분해 분극 및 탈분극 추적

  • 김광목 (한국지질자원연구원 광물자원연구본부)
  • Received : 2020.11.27
  • Accepted : 2020.12.30
  • Published : 2020.12.30
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Abstract

The formation characteristics of calcium carbonates are closely related to the durability and mechanical properties of cement-based materials. In this regard, a deep understanding of the reaction pathway of calcium carbonates is critical. Recently, non-classical nucleation theory was summarized and it was presumed that prenucleation clusters are present. The formation of the prenucleation cluster at undersaturated condition (≈ 0.1 ml) in the present study was investigated via electrical characteristics of an electrolytic solution. Calcium chloride dihydrate (CaCl2·2H2O) and sodium carbonate (Na2CO3) were used as starting materials to supply calcium and carbonate sources, respectively. Furthermore, the reaction pathway of calcium carbonates was investigated by time-resolved polarization and depolarization characteristics of the electrolytic solution. The time-resolved polarization and depolarization tests were conducted by switching polarity with an interval of 20 seconds for 1 hr and by measuring the variation of electrical resistance. It can be inferred from the results obtained in the present study that the reactive constituent for the formation of calcium carbonates was mostly consumed in the period possibly associated with the prenucleation and the reaction pathways may be governed by the monomer-addition mechanism.

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References

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