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- W99002893 abstract "The effects of several parameters on the workability and strength of alkali-activated high calcium fly ash (AAHCFA) concrete were investigated in this study. The AAHCFA concretes were activated with alkali sodium hydroxide solution (NaOH), sodium silicate solution (Na2SiO3) and heat. Three alkali liquid to fly ash (L/S) ratios of 0.55, 0.60 and 0.65, three NaOH concentrations of 10, 15 and 20 molars (M) and three Na2SiO3/NaOH ratios of 1.0, 1.5 and 2.0 were used. The workability was obtained by measuring the slump and the compressive strength was tested to gauge the strength of concrete. The results revealed that the workability of AAHCFA concrete was related to the molar ratio of H2O/Na2O in activator, the NaOH concentration, and the L/S ratio. The improvement in compressive strength was mainly related to the increase in the NaOH concentrations. The strength was, however, reduced with the increase in the Na2SiO3/NaOH ratio. The obtained slumps were in the range of 70 to 260 mm and the 28-day compressive strength ranged from 9.0 to 47.5 MPa. The influence of delay time (the time taken from the completion of specimen casting to the start of heat curing), curing temperature and curing duration on compressive strength were also presented." @default.
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- W99002893 date "2012-01-01" @default.
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- W99002893 title "FACTORS AFFECTING THE WORKABILITY AND STRENGTH OF ALKALI-ACTIVATED HIGH CALCIUM FLY ASH CONCRETE" @default.
- W99002893 doi "https://doi.org/10.30638/eemj.2012.177" @default.
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