The Structural Engineer > Archive > Volume 65 (1987) > Issues > Issue 6 > Correspondence on Alkali-Silica Reaction in Concrete by Dr. D.W. Hobbs
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Correspondence on Alkali-Silica Reaction in Concrete by Dr. D.W. Hobbs

Dr. F. G. Buffler: Dr. Hobbs’ views differ in a number of respects from those given in the draft Concrete Society Technical Report Minimising the risk of alkali-silica reaction-Guidance notes and model specification clauses which was issued in 1985 and resulted from the deliberations of a working party under the chairmanship of Mr M. R. Hawkins. The edited version of this report should be published in 1987. Dr. Hobbs has, on more than one occasion, attended meetings of the working party in order to present his views, particularly with respect to the maximum alkali limit for concrete and on the effectiveness of pulverised-fuel ash (pfa) and ground granulated blast furnace slag (ggbfs) as means of minimising the risk of the occurrence of damaging expansion due to the alkali-silica reaction. On those occasion his views were similar to those stated in the present paper but, for a variety of reasons, the working party decided not to adopt them. It must be emphasised that the opinions given below are personal ones and that, although other members of the working party might agree with them, there has been no meeting of the group to comment on the technical differences between Dr. Hobbs’ paper and the revised version of the draft Concrete Society report referred to above.