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April 1, 2026Cement Science and Concrete Technology0 citationsOpen Access

Mechanism of Microstructure Change in Synthesized Tobemorite During Accelerated Carbonation by Water Vapor Sorption Isotherms

RIRyusei IgamiGIGo IgarashiRKRyo Kurihara

Key Points

  • The aim is to investigate the microstructural changes in tobermorite during accelerated carbonation.
  • Synthetized tobermorite with Ca/Si ratio of 0.84 was exposed to 60% relative humidity and 1.0% CO2.
  • Performed water vapor adsorption isotherm tests during carbonation.
  • Analyzed phase compositions using X-ray diffraction, Rietveld analysis, thermal gravimetric analysis, and infrared spectroscopy.
  • Observed a significant change in hysteresis in the low relative pressure region of adsorption isotherms.
  • Parameter c in BET adsorption isotherm decreased notably due to the complete breakdown of C-S-H into silica gel during carbonation.
  • Discussed the implications of the microstructural transformation on the material's properties.

Abstract

本論文は、Ca/Si=0.84として合成したトバモライトの粉末試料を相対湿度60%および二酸化炭素濃度1.0%の環境下で加速炭酸化させた。炭酸化過程で水蒸気吸着等温試験を実施し、吸着等温 線の変化について、X 線回折/Rietveld解析、熱重量分析、赤外分光法から得られた相組成変化と併せて、C-S-Hの分解に伴う空隙構造変化について考察を行った。水蒸気吸着等温線の低相対圧領域に生じていたヒステリシスは、およびBET吸着等温式の吸着エネルギーの大きさに依存したパラメータcはC-S-Hが炭酸化によってシリカゲルにほぼ全て分解したことで大きく減少した。

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Cite This Study

Igami et al. (2026) studied this question.

synapsesocial.com/papers/69cd79e15652765b073a6b3bhttps://doi.org/10.14250/cement.79.11
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