Laboratory Manual of Testing Materials

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McGraw-Hill Book Company, Incorporated, 1920 - Building materials - 178 pages
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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 77 - Tubes inserted horizontally may be used where the construction of the bin permits. Samples shall be taken from points well distributed over the face of the bin. (c) From...
Page 85 - ... 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...
Page 152 - Tensile Strength. Ib. per sq. in. Elastic Limit. Ib. per sq. in. Elongation in 2 in., per cent. Reduction of Area, per cent.
Page 89 - The sand to be used shall be natural sand from Ottawa, 111., screened to pass a No. 20 sieve and retained on a No. 30 sieve.
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 87 - In molding the pat, the cement paste shall first be flattened on the glass and the pat then formed by drawing the trowel from the outer edge toward the center.
Page 87 - The consistency of standard mortar shall depend on the amount of water required to produce a paste of normal consistency from the same sample of cement. Having determined the normal consistency of the sample, the consistency of standard mortar made from the same sample shall be as indicated in Table II the values being in percentage of the combined dry weights of the cement and standard sand.
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.

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