Abstract
Stability of Dyckerhoff cement Class G partially substituted (15 mass%) by metakaolin (MK), silica fume (SF) and ground granulated blast-furnace slag (BFS) was investigated after 7 days of curing under standard and two different autoclaving conditions. Mercury intrusion porosimetry, X-ray diffraction analysis and combined thermogravimetric–differential scanning calorimetry were used to evaluate pore structure development, compressive strength and their dependence on the type of additives in relation to the particular phase composition. Hydrothermal curing led to the formation of α-C2SH and jaffeite, mostly in the case of referential samples and compositions with addition of slowly reacting BFS. Whilst modest hydrothermal curing (0.6 MPa, 165 °C) favoured formation of α-C2SH, larger amounts of jaffeite were determined after curing at the highest used pressure and temperature (2.0 MPa, 220 °C). Undesired transformation of primary hydration products was prevented especially by addition of highly reactive and very fine SF. Particular composition attained the best pore structure characteristics and compressive strength after curing at 0.6 MPa and 165 °C. Formation of more stable phases with C/S ratio close to 1 was proved by wollastonite formation during DSC analyses. More severe conditions of curing, however, led to the significant deterioration of microstructure and strength of corresponding sample, probably due to the formation of trabzonite, killalaite and zoisite. Considering the values of hydraulic permeability coefficient and compressive strength, replacement of cement by MK improved significantly the properties of cement when compared with the referential as well as with other blended compositions under the mentioned curing conditions.
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Abbreviations
- C:
-
CaO
- S:
-
SiO2
- A:
-
Al2O3
- F:
-
Fe2O3
- H:
-
H2O
- M:
-
MgO
- \(\overline{\text{C}}\) :
-
CO2
- \(\overline{\text{S}}\) :
-
SO3
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This work was supported by courtesy of APVV-15-0631, Slovak Grant Agency VEGA No. 2/0097/17 and by Project Sustainability and Development REG LO1211 addressed to the Materials Research Centre at FCH VUT.
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Kuzielová, E., Žemlička, M., Másilko, J. et al. Effect of additives on the performance of Dyckerhoff cement, Class G, submitted to simulated hydrothermal curing. J Therm Anal Calorim 133, 63–76 (2018). https://doi.org/10.1007/s10973-017-6806-2
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DOI: https://doi.org/10.1007/s10973-017-6806-2