Abstract
The dielectric constant (?') of Sulfate Resisting Portland Cement (SRPC) blended with 30% of fly ash by addition ismeasured using microwave bench at 9.54 GHz, for initial 30 hours of hydration. The heat of hydration for the sameblend using heat of solution calorimetry is also measured. It is observed that contrary to the usual trend of retarding offly ashes, it shows an accelerating trend with increasing strength as times passes. SEM micrographs and XRD patternsare also recorded and observed that C4Al2SO16 (C4A3S¯) is found to be responsible for the accelerating trend of the mix.The hydration process in the early period is studied and it is suggested that suitable retarder should be adopted for theeffective utilization.Cement chemistry notations: C=CaO, A=Al2O3, S¯=SO3, H=H2O, F=Fe2O3, S=SiO2
Highlights
Syntax Error: Unknown character collection 'Adobe-GB1'. This peculiar behavior of the fly ash is interesting and needs a scientific approach. Since, such studies on fly ashes blended with Sulfate Resisting Portland Cement (SRPC) are seem to be rarer, the authors have under taken the present work
The authors have made an attempt to study the blending of such a fly ash, with commercial SRPC hydrated with deionized water and the hydration process in terms of dielectric properties for first 30 hours
From the Figure.4 it is observed that 30% fly ash addition is associated with (i) decrease in heat output (ii) shortening of induction and dormant periods (iii) slight shift of the exotherm towards lower time scale (iv)diffusion in shape of the peak and (v).decrease in FWHM
Summary
This peculiar behavior of the fly ash is interesting and needs a scientific approach. Since, such studies on fly ashes blended with SRPC are seem to be rarer, the authors have under taken the present work. The authors have made an attempt to study the blending of such a fly ash, with commercial SRPC hydrated with deionized water and the hydration process in terms of dielectric properties for first 30 hours. This helps to understand the behavior of this particular fly ash
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