E_H-pH- and main element analyses of Blast Furnace Slag Cement paste pore solutions activated with sodium monofluorophosphate - Implications for carbonation and self-healing

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• 作者：J. Kempl ; ^{j.kempl@tudelft.nl" class="auth_mail" title="E-mail the corresponding author} ; O. Ç ; opuroğlu
• 关键词：Granulated blast furnace slag ; Inorganic self-healing ; Carbonation ; Amorphous material ; Pore solution ; Na-MFP
• 刊名：Cement and Concrete Composites
• 出版年：2016
• 出版时间：August 2016
• 年：2016
• 卷：71
• 期：Complete
• 页码：63-76
• 全文大小：2261 K

文摘

Over the past decade, sodium monofluorophosphate (Na-MFP) gained attention as inorganic self-healing agent on Blast Furnace Slag Cement (BFSC) products. Recent experimental studies revealed the recovering effect of Na-MFP on the microstructure of carbonated BFSC pastes with respect to their frost-salt scaling durability.

This study investigates the interactions between pore solution and hydration products of OPC and BFSC pastes that were carbonated and/or vacuum-impregnated with aqueous Na-MFP. Pore solutions of pastes were characterized through systematic E_H-pH- and main element analyses by inductively coupled optical emission spectrometry (ICP-OES). Solid hydration products were analyzed by X-ray powder diffraction (XRD).

Results indicate that the impregnation of hardened carbonated cement pastes with aqueous Na-MFP results in a recovery of the initial pH of 98.85% and 79.81%, respectively. Analytical results give insight into hydration and carbonation under the influence of Na-MFP. Results are compared with literature and expose that the hypothesis of crystalline apatite formation in BFSC products must be revised.