Thoughts For The Times
Two Points About Conchi.tf.. “The Times’ Engineering Supplement” draws attention ho two points in connection with concrete which may he of interest to readers. The H>t of these is that the larger proportion of surplus water expelled from ••oirrete by pressure during the ramming stage, the greater will he the strength ;.f the concrete. This has been proved pretty conclusively by accurate tests. '! lie second is that the popular demand for “sharp" sand in concrete mixtures is not justified by facts, as sand eompo—ed of rounded particles gives concrete a greater strength than angular sand, far the concrete will work easily with less witter where the sand grains mov,. freely over one another. What is of real importance is that the sand should lie absolutely free front organic impurities, one part of which in a thousand parts of sand may reduce tile strength of the concrete by 25 per cent.
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Bibliographic details
Hokitika Guardian, 20 September 1921, Page 2
Word Count
154Thoughts For The Times Hokitika Guardian, 20 September 1921, Page 2
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