Synopsis A limited investigation of the influence of 35% replacement of one OPC by two pfa's upon rate and depth of carbonation, strength development and water retention of concrete cubes is described. It is shown that both water retention and strength development of OPC/pfa concretes may be more adversely affected by short-term curing than those of OPC concretes and that the depth of carbonation in concretes of a similar water/binder ratio or similar binder content can be substantially higher in OPC/pfa concretes than in OPC concretes. The depth of carbonation of the OPC/pfa concretes tested after 3 years is similar or slightly higher than in the OPC concretes of similar 28 day compressive strength.
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D. W. Hobbs (1988) studied this question.