Mix proportioning and engineering properties of conditioned PFA concrete

NOTE: THE MATHEMATICAL SYMBOLS IN THIS ABSTRACT CANNOT BE DISPLAYED CORRECTLY ON THIS PAGE. PLEASE REFER TO THE ABSTRACT ON THE PUBLISHER'S WEBSITE FOR AN ACCURATE DISPLAY.This paper describes the mix design procedure developed for use with conditioned (moistened) pulverized-fuel ash (PFA) in structural concrete. It is shown that a given strength can be achieved with conditioned PFA concrete with some reduction in w/c ratio, compared to equivalent dry PFA mixes. The adjustment required is progressive with conditioned PFA storage period (up to 6 months), but is not influenced significantly by either dry PFA characteristics or conditioning/storage variables. For a given strength, the development of compressive strength (up to 180 days), flexural strength, modulus of elasticity (E), drying shrinkage (?S) and creep (?C) are essentially the same for dry and conditioned PFA mixes. The practical implications of the work are presented.