TY - JOUR
T1 - EH-pH- and main element analyses of Blast Furnace Slag Cement paste pore solutions activated with sodium monofluorophosphate
T2 - Implications for carbonation and self-healing
AU - Kempl, J.
AU - Copuroglu, Oguzhan
PY - 2016/8/1
Y1 - 2016/8/1
N2 - 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 EH-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.
AB - 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 EH-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.
KW - Amorphous material
KW - Carbonation
KW - Granulated blast furnace slag
KW - Inorganic self-healing
KW - Na-MFP
KW - Pore solution
UR - http://www.scopus.com/inward/record.url?scp=84970969693&partnerID=8YFLogxK
U2 - 10.1016/j.cemconcomp.2016.05.004
DO - 10.1016/j.cemconcomp.2016.05.004
M3 - Article
VL - 71
SP - 63
EP - 76
JO - Cement and Concrete Composites
JF - Cement and Concrete Composites
SN - 0958-9465
ER -