Effect addition of met kaolin and nano-metakaolin on mechanical properties and Kinetics of hydrothermal hydration of Portland cement clinker.
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Ground granulated blast-furnace slag, metakaolin, nano-metakaolin, Portland cement clinker, Kinetic, hydrothermal hardening.
Abstract
This experimental study to investigate effect of metkaolin and nano-metakaolin on the mechanical properties and Kinetics of Hydration of autoclaved specimens made from OPCC, GGBFS, MK and NMK. The dry mixtures were prepared by thermal activation with the same initial water/solid cement (W/S) ratios of about 0.28 for 3minutes. Cylindrical specimens were moulded at a pressure of 50 kg/cm2. Different hydrothermal reactions were studied by the hydrothermal treatment in an autoclaved at a pressure of 8 atm. of saturated steam for different time intervals of 0.5,2,6,12 and 24 hours. Various hydrothermal reactions were studied with respect to hydration kinetics, compressive strength of the hydration products. The kinetics of the hydrothermal hardening processes were studied via the determination of chemically combined water and free lime contents at the different autoclaved ages up to 24 hours. Were found incorporation of NMK in OPCC – GGBFS – MK – NMK blend is accompanied by increase in the compressive strength results of the autoclaved specimens made of this blend. The higher strength values of the hydrothermally hardened specimens made of autoclaved OPCC – GGBFS – MK-NMK blend are mainly attributed to the formation of calcium silicate hydrate CSH hydrates.
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