A treatise on concrete, plain and reinforced : materials, construction, and design of concrete and reinforced concrete; 2nd ed. . y EHot C. Clarkef illustrates the difference inweight between cements of the same manufacture which contain differentpercentages of coarse particles. Weights of Cements Co7itaiiiing Varying Percentages of Coarse Particles. (See p 114.) By Eliot C. Clarke. Percentage of cement retained Weight on No. 120 sieve per cu, ft. O 75 lb. 10 79 20 82 30 86 40 90 ?Candlots Ciments et Chaux Hydrauliques, 1898, p. American Society of Civil Engineers, Vol. XIV,
A treatise on concrete, plain and reinforced : materials, construction, and design of concrete and reinforced concrete; 2nd ed. . y EHot C. Clarkef illustrates the difference inweight between cements of the same manufacture which contain differentpercentages of coarse particles. Weights of Cements Co7itaiiiing Varying Percentages of Coarse Particles. (See p 114.) By Eliot C. Clarke. Percentage of cement retained Weight on No. 120 sieve per cu, ft. O 75 lb. 10 79 20 82 30 86 40 90 ?Candlots Ciments et Chaux Hydrauliques, 1898, p. American Society of Civil Engineers, Vol. XIV, p. 144. SPECIAL TESTS OF CEMENT AND MORTAR 115 Mr. Henry Faijas experiments* arranged in the following table provethat the weight of a cement decreases with age. His explanation for thisis that the lower specific gravity of the moisture and carbonic acid absorbedfrom the air tends to increase the bulk of the cement without correspond-ingly increasing its weight. Decrease of Weight of Cement with H. Faija. {See p. 115.) Percentage ofloss in weight When received After one three months six nine one Method of Weighing Cement. The apparatus finally recommendedby the French Commission, after a series of tests by Mr. P. Alexandre,!was a circular funnel with screen, as shown in Fig. 40. The cementplaced upon the screen is stirred with a wooden spatula 4 cm. (if in.)wide, and 25 cm. (10 in.) long, and falls through the screen into thecylindrical measure of one liter capacity (61 cu. in.).
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Keywords: ., bookcentury1900, bookdecade1910, bookpublishernewyo, bookyear1912
