Standard Methods of Testing and Specifications for Cement |
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28 days A. F. Gerstell accelerated tests acid Alfred Noble American Society beaker blast boiling briquettes Bunsen burner CLIFFORD RICHARDSON Committee on Uniform CONSTANCY OF VOLUME Consulting Engineer cubic centimeters day in moist days 1 day determination diameter Engineer and Chemist evaporated F. H. LEWIS Fahr filtered filtrate flask GEORGE F Glens Falls hours in moist HUMPHREY iron JANUARY 20 linear inch Long Island City loss on ignition MATCHAM Messrs methods minutes mixing moist air moist closet moulding neat cement needle NEWBERRY normal consistency observed at intervals pats Philadelphia platinum crucible precipitate quantity recommended residue RICHARD RICHARD L sample Sault Ste sieve silica Society for Testing Society of Civil specific gravity Specifications for Cement Standard Specifications steam SULPHURIC SULPHURIC ACID SWAIN temperature TENSILE STRENGTH test pieces Testing Materials Tests of Cement tion twenty-four hours Uniform Tests W. W. Maclay water maintained Webster wire
Popular passages
Page 11 - Fahr.) and cooled to the temperature of the liquid, Is gradually introduced through the funnel (B) the stem of which extends into the flask to the top of the bulb (C), until the upper mark (F) is reached.
Page 18 - The sand and cement should be thoroughly mixed dry. The mixing should be done on some non-absorbing surface, preferably plate glass. If the mixing must be done on an absorbing surface it should be thoroughly dampened prior to use.
Page 25 - The precipitate shall be dissolved in a small quantity of hot hydrochloric acid, the solution diluted to about 100 cc, 1 cc of a saturated solution of sodium-ammonium-hydrogen phosphate added, and ammonia drop by drop, with constant stirring, until the precipitate is again formed as described and the ammonia is in moderate excess. The precipitate shall then be allowed to stand about two hours, filtered and washed as before.
Page 22 - In the present state of our knowledge it cannot be said that cement should necessarily be condemned simply for failure to pass the accelerated tests; nor can a cement be considered entirely satisfactory simply because it has passed these tests.
Page 16 - The Committee recognizes the grave objections to the standard quartz now generally used, especially on account of its high percentage of voids, the difficulty of compacting in the moulds, and its lack of uniformity...
Page 22 - A third pat is exposed in any convenient way in an atmosphere of steam, above boiling water, in a loosely closed vessel for five hours. 23. These pats, to satisfactorily pass the requirements, shall remain firm and hard, and show no signs of distortion, checking, cracking, or disintegrating.
Page 13 - ... cm. (0.39 in.) in diameter, the cap, rod and cylinder weighing 300 gr. (10.58 oz.). The rod, which can be held in any desired position by a screw (F) carries an indicator, which moves over a scale (graduated to centimeters) attached to the frame (K). The paste is held by a conical, hard-rubber ring (I), 7 cm.
Page 13 - The thoroughly dried and coarsely screened sample is weighed and placed on the No. 200 sieve, which, with pan and cover attached, is held in one hand in a slightly inclined position, and moved forward and backward, at the same time striking the side gently with the palm of the other hand, it the rate of about 200 strokes per minute.
Page 22 - Fahr.) and upward. The test pieces should be allowed to remain 24 hours in moist air before immersion in water or steam, or preservation in air.
Page 14 - Section 37, and quickly formed into a ball with the hands, completing the operation by tossing it six times from one hand to the other, maintained about 6 in.