Briefs on Portland Cement and Concrete

Front Cover
1908 - Cement - 191 pages
 

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Page 38 - This term is applied to the finely pulverized product resulting from the calcination to incipient fusion of an intimate mixture of properly proportioned argillaceous and calcareous materials, and to which no addition greater than 3 per cent has been made subsequent to calcination.
Page 43 - Pats of neat cement about three inches in diameter, one-half inch thick at the center, and tapering to a thin edge, shall be kept in moist air for a period of twenty-four hours.
Page 43 - F. as practicable, and observed at intervals for at least 28 days. (c) A third pat is exposed in any convenient way in an atmosphere of steam, above boiling water, in a loosely closed vessel for five hours. These pats, to satisfactorily pass the requirements, shall remain firm and hard and show no signs of distortion, checking, cracking, or disintegrating.
Page 38 - ... clean, coarse, free from vegetable loam or other deleterious matter, and not more than 6 per cent, shall pass a sieve having 100 meshes per linear inch.
Page 43 - ... (a) A pat is then kept in air at normal temperature and observed at intervals for at least 28 days.

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