The Structural Engineer > Archive > Volume 13 (1935) > Issues > Issue 2 > Mortar Tests as a Guide to the Strength of Concrete. Discussion on the Paper by Dr. W.H. Glanville a
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Mortar Tests as a Guide to the Strength of Concrete. Discussion on the Paper by Dr. W.H. Glanville and Mr. D.A.G. Reid

Mr. D.A.G. REID, in a few words supplementing Dr. Glanville’s presentation of the paper, said that he might try to express in another form what he felt to be the value of the wet mortar test. It amounted practically to this, that if one had a strength-age curve for the wet mortar, and then immediately one had also a strength-age curve for a 1:2:4 concrete with a water-cement ratio of 60 per cent., and, with the aid of a few general relationships, strength-age curves could be constructed for any other concrete made with that cement; and the strengths taken off from such strength-age curves would be correct to within about 10 per cent. If, however, any such operation were carried out with a dry mortar test, inevitably it seemed errors of 20 per cent. or more crept into the estimates. Of course, that could be got over if the mortar- concrete strength relationship were available for the particular batch of cement, but that contingency was not very likely. Dr. Glanville had mentioned the carrying out of preliminary tests before the commencement of the main programme. The results of these tests had proved very instructive, and had been of considerable value in assisting in the interpretation of the results of the main series. Mr. Reid felt that this portion of the work would be of great interest to anyone connected with the testing of cements and concretes.