Material for publication as a Communication must be on a n urgent matter and be of obvious scientijk importance. Rapidity of publication is enhanced if diagrams are omitted, but tables and formulae can be included. Conamunications should not be simple claims for priority: this facility for rapid publication i s intended for brief descriptions of work that has progressed to a stage at which it i s likely to be valuable to workers faced with similar problems. A fuller paper ynny be offered subsequently, if justilfied by later work.Manuscvipts are not subjected to the usual examination by refevees and inclusion of a Communication is at the Editor's discyetion.
All of the early papers establishing permeability as a technique for measuring the surface area of powders (cements in particular) were published in the Journal of the Society of Chemical Industry, some of them by members of the Road and Building Materials Group. Not only is this therefore an appropriate audience for a paper o n the subject but the time is also appropriate because of the very recent publication of the revision of BS 4359 Part 2.1 Carman2.3 studied the flow of incompressible fluids through packed beds of powder and proposed the relationship: which is known as the Kozeny -Carman equation. Because of the simplifying assumptions made Sv is, strictly, the "effective" permeability volume surface area (units m2imj) and will not necessarily have the same value as surface areas measured by other techniques. For convenience, in this paper the correct terminology is implied by the simpler term, surface area. K is the Kozeny constant and is normally taken to have a value of 5.0 for powders.Carman used liquids and recommended acetone for measuring cements. However, cements have a * This paper was first published in Chemistry and Industry. 1983. p. 632.
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