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acid Amer American Society amount apparatus Apply the load average axis Balance beam Balance beam Balance beam brick briquettes broken stone cast iron cent coarse aggregate compressive strength cubic foot cylinder deformation determined diagram diameter or thickness drum elastic limit elongation Experiment extensometer Fineness Modulus fracture gage length gravel hammer Hydraulic hydrochloric acid increment Johnson's Materials laboratory Materials of Construction maximum load measured metal method mixed mixture modulus of elasticity moisture mold mortar obtained particles percentage permissible variation placed plaster of Paris plate proportions ratio readings record resilience rupture sample scale screen Screw shearing sieve Sieve Analysis silt Society for Testing solution specific gravity speed spherical bearing square inch Strength of Materials tamped tensile strength Tension Test test piece testing machine Testing Materials tion ultimate unit stress Vertical Vertical Vertical voids volume wire yield point
Page 86 - ... and the excess paste at the smaller end sliced off at the top of the ring by a single oblique stroke of a trowel held at a slight angle with the top of the ring, and the top smoothed, if necessary, with a few light touches of the pointed end of the trowel.
Page 85 - The dry materials shall be weighed, placed upon a non-absorbent surface, thoroughly mixed dry if sand is used, and a crater formed in the center, into which the proper percentage of clean water shall be poured; the material on the outer edge shall be turned into the crater by the aid of a trowel. After an interval of J minute for the absorption of the water, the operation shall be completed by continuous, vigorous mixing, squeezing and kneading with the hands for at least one minute.* During the...
Page 85 - C being 1 cm. in diameter for a distance of 6 cm., the other having a removable needle D, 1 mm. in diameter, 6 cm. long. The rod is reversible, and can be held in any desired position by a screw E, and has midway between the ends a mark F which moves under a scale (graduated to millimeters) attached to the frame A. The paste is held in a conical, hard-rubber ring G, 7 cm. in diameter at the base, 4 cm. high, resting on a glass plate H about 10 cm. square.
Page 83 - The flask, during the operation, shall be kept immersed in water, in order to avoid variations in the temperature of the liquid in the flask, which shall not exceed 0°.5 C.
Page 160 - ... in diameter, and shall be graded in size from the smallest to the largest particles. It shall be clean, hard, durable and free from all deleterious matter; coarse aggregate containing dust, soft or elongated particles shall not be used.
Page 80 - C. for one-half to one hour. The residue shall be treated with 10 cc. of concentrated hydrochloric acid diluted with an equal amount of water. The dish shall be covered and the solution digested for ten minutes on a steam bath or water bath. The diluted solution shall be filtered and the separated silica washed thoroughly with water...
Page 158 - The cement shall be stored in such a manner as to permit easy access for proper inspection and identification of each shipment, and in a suitable weather-tight building which will protect the cement from dampness.
Page 91 - The moist closet may consist of a soapstone, slate or concrete box, or a wooden box lined with metal.
Page 147 - ... 3. The test shall consist of a 1 cm. fall of the hammer for the first blow, and an increased fall of 1 cm. for each succeeding blow until failure of the test piece occurs. The number of blows necessary to destroy the test piece is used to represent the toughness, or the centimeter-grams of energy applied may be used.