DECAYING EXPONENTIAL MODELS FOR PREDICTING THE SETTING TIME OF CONCRETE AS A FUNCTION OF ITS PENETRATION BY PROCTOR NEEDLE USING SUGAR AS ADMIXTURE
Publication Date : 02/03/2016
This research work set out to develop decaying exponential models for predicting the setting time of concrete as a function of its penetration by proctor needle using common sugar as the admixture. Various percentages of sugar by weight of cement (0.01% —1%) were added to the concrete mix of 1:1:2/0.5 by weight and tested for setting every 15 minutes. It was shown that as the concrete set, the depth of penetration decreased exponentially following decaying models of the form Y = C1e-C 2X where Y represents the depth of penetration of the proctorneedle, x the delay in minutes, C1 and C2 are constants. Also, the research showed that increases in the percentage of sugar present resulted in the slowing down of the rate of setting of concrete and increased the average penetration per minute.
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