Bulletin of the Iowa Engineering Experiment Station, Issues 51-64

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Page 5 - Fine aggregate shall consist of sand, stone screenings or other inert materials with similar characteristics, or a combination thereof, having clean, hard, strong, durable, uncoated grains and free from injurious amounts of dust, lumps, soft or flaky particles, shale, alkali, organic matter, loam or other deleterious substances.
Page 5 - Fine aggregate shall be of such quality that mortar briquettes, cylinders or prisms, consisting of one part by weight of portland cement and three parts by weight of fine aggregate,1 mixed and tested in accordance with the methods described in the Standard Specifications and Tests for Portland Cement...
Page 97 - Inoculate a series of lactose broth fermentation tubes with appropriate graduated quantities of the water to be tested. In every fermentation tube there must always be at least twice as much medium as the amount of water to be tested.* When required to examine larger amounts than 10 cc.
Page 105 - C until all gelatin is dissolved.* 3. Make up lost weight and adjust the reaction to a faint pink with phenol red, or if the phenolphthalein titration is used, and the reaction is not already between +0.5 and +1, adjust to +1. 4.
Page 8 - Add a 3 per cent solution of sodium hydroxide until the volume of the sand and solution, after shaking, amounts to 7 oz. Shake thoroughly and let stand for 24 hours. Observe the color of the clear liquid above the sand.
Page 15 - ... color which results is due to a definite end product in the fermentation of glucose. Voges and Proskauer (1898), in their original publication, describe the test as follows: " On addition of caustic potash, we observed a new and interesting color reaction. If the tube be allowed to stand twenty-four hours and longer at room temperature, after the addition of the potash, a beautiful fluorescent color somewhat similar to that of a dilute alcoholic solution of eosin forms in the culture fluid particularly...
Page 97 - The formation of 10 per cent or more of gas in a standard lactose broth fermentation tube within twenty-four hours at 37 C. is presumptive evidence of the presence of members of the B. coli group, since the majority of the bacteria which give such a reaction belong to this group. The appearance of aerobic lactose-splitting colonies on...
Page 7 - Coarse aggregate shall consist of crushed stone, gravel, slag, or other approved inert materials with similar characteristics, or combinations thereof, having clean, hard, strong, durable, uncoated particles, free * Adopted by letter ballot following the 1930 convention. from injurious amounts of soft, friable, thin, elongated or laminated pieces, alkali, organic or other deleterious matter.
Page 105 - Cool to 45 C. in a cold water bath, then warm to 65 C. in the same bath, without stirring. 3. Make up lost weight and adjust the reaction to a faint pink with phenol red, or if the phenolphthalein titration is used, and the reaction is not already between +0.5 and +1, adjust to +1.
Page 5 - Standard Specifications and Tests for Portland Cement (Appendix 2) will show a tensile or compressive strength at ages of 7 and 28 days not less than per cent2 of that of 1 : 3 standard Ottawa sand mortar of the same plasticity made with the same cement. Concrete tests shall be made in accordance with the Tentative Methods of Making Compression Tests of Concrete (Serial Designation: C 39 - 21 T) of the American Society for Testing Materials.

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