The Structural Engineer > Archive > Volume 7 (1929) > Issues > Issue 11 > Experiences in the Physical and Chemical Examination of Concrete Discussion on Mr. Worsdale's Paper
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Experiences in the Physical and Chemical Examination of Concrete Discussion on Mr. Worsdale's Paper

MR. H. GARDINER LLOYD (Member), speaking as one who for many years had been engaged on the supervision of constructional work as well as laboratory work, first expressed agreement with Mr. Worsdale that metal and not wood should be used for moulds, and also pointed out that different results might be obtained in the compression test by using different packings between the cubes and the platens. He believed that a great deal of work had been done by the American Society for testing materials in this connection, and reference to that work would be helpful. Referring to Mr. Worsdale’s statement that, "if a cube face were seriously pitted, probably the best results could be obtained bv covering the surface with a layer of neat plaster, this being allowed to set, either between the plates of the machine or in contact with a plane glass or metal surface,” he said it should be borne in mind that this layer should be exceedingly thin, because if one put on a layer 1/4-in. thick, and the material happened to be weaker than the cube, the strength as indicated by the test would be much lower than if no such layer were used. One must be very careful to ensure that such a mistake was avoided. With regard to the concrete cubes mentioned at the top of page 360, which were tested in two different laboratories and yielded results which differed considerably, it woidd be interesting to know who had filled the moulds.