chapter  41
12 Pages

A COMPARISON OF THE PROPERTIES OF OPC AND PFA CONCRETES IN 30-YEAR-OLD MASS CONCRETE STRUCTURES

Recent comparisons of the performance of opc and pfa concrete in real structures (Thomas, 1989; Thomas et al. 1990) have confirmed the benefits of incorporating good quality pfa in structural concrete, with increased strength and reduced permeability being observed for pfa concrete compared with equal grade opc concrete. In both these studies

the pfa used complied with BS 3892: Part 1 ‘Specification for pulverized-fuel ash for use as a cementitious component in structural concrete’ (British Standards Institution, 1982) and the comparable opc and pfa concrete mixes were designed on the basis of equal strength grade and workability.