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Some studies on strength of spread concrete using selfing concept.

In concreting work, the usual procedure to complete a particular casting at a stretch and without any break, seems to be strongly justified. Otherwise, after a certain time lag (counted from the instant of time, when water is added to the dry mass to the instant of time of placing into the moulds), the concrete not only deviates from its designed target strength, but also is susceptible to the reduced workability, which further invites hardship during placing. However, due to unforeseen circumstances like mechanical or electrical power failure, accident, bad supervision, etc. often concreting work is hampered in one single operation. Though not wanted, casting operation in these circumstances, often is, seen to be carried out in layers, each with the given mix considered at different time lags, in which case the physical as well as strength properties of the concrete of any such individual layer, is bound to differ appreciably from those of the other. Concrete thus cast in layers is prone to be weaker at the common interface. More Info

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