Action of the salts in alkali water and sea water on cements. . year, althougha year apart, so that they were subjected to approximately similarweather conditions. This higher strength value need not beattributed however to the iron content as undoubtedly the sameresults could be obtained with normal Portland cement. 62 Technologic Papers of the Bureau of Standards The strength of 1:2:4 proportion concrete using seashore sand,which is very fine grained and uniform in size, in place of the well-graded Jersey sand, is greater than had been expected and interest-ing in connection with the stateme
Action of the salts in alkali water and sea water on cements. . year, althougha year apart, so that they were subjected to approximately similarweather conditions. This higher strength value need not beattributed however to the iron content as undoubtedly the sameresults could be obtained with normal Portland cement. 62 Technologic Papers of the Bureau of Standards The strength of 1:2:4 proportion concrete using seashore sand,which is very fine grained and uniform in size, in place of the well-graded Jersey sand, is greater than had been expected and interest-ing in connection with the statements of A. Bauchere17 that evenfine-grained sands do not make durable sea-water mortars. Theresults are given in Tables 19 and 20 (p. 137) and Fig. 28. Theconcrete made with seashore sand developed about 33 per cent lessstrength than concrete made with Jersey sand at 4 weeks and 20 Concrete: 1 Part Cement, 2 Parts Sand, 4 Parts Trap Rock 5000 UJ 24000 CO tcUl a § 3000 zci Z2000 UJ tc fe III> CO S 1000K a. 2oo 4237+ GERMAN PORTLAND CEMENT-JERSEY SAND 4237+. ?SLAG CEMENT-JERSEY SAND. SLAG CEMENT-JERSEY SAND -IN SEA WATER? IN FRESH WATER 4 13 26 AGE OF TEST PIECES IN WEEKS Fig. 28.—Compressive strength of 1:2:4 concrete made with various cements after storage in fresh water and sea water per cent less at 52 weeks for that stored in sea water, and about 30per cent less at 4 weeks and equal strength at 52 weeks for thatstored in fresh water. The possibility of temperature and freezingeffects should also be taken into consideration in making thiscomparison. In Table 21 (p. 139) and Fig. 29 are given the results of a series ofcompression tests of concrete cylinders made of pit run Gorgonagravel No. 55. Part of the test pieces were stored in damp room, 17 Manager of the Societe des Cements Francais; Engineering (London), 82, p. 655. Action of Alkali and Sea Water on Cements 63 part in tanks of fresh water, and part in tanks of sea water, testsbeing made at periods ranging from eig
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