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24 hours 28 days accelerated tests adulteration alumina American Society amount apparatus average barrel beaker benzine boiling test brand burning calcination calcium carbonic carbonic acid cement testing cent chemical clinker concrete cracks crucible damp closet determination diameter disintegration employed error Fahr filter fineness flask gauge give glass grams grinding gypsum hard set hardening hydrated hydrochloric acid initial set iron kilns less lime limestone load machine magnesia manufacture ment method mills minutes mixed mixture moist air mortar moulds natural cement neat briquettes neat cement normal consistency obtained operation particles pass placed Portland cement potassium permanganate pounds Pozzuolana practice precipitate produce quantity residue sample sand mortar shipment shown in Fig sieve sifting silica similar slag Society of Civil solution specific gravity specimen square inch sufficient sulphate sulphuric acid TABLE temperature tensile strength tests of cement tion trowel tube uniform washed weight wire
Page 185 - All tests shall be made in accordance with the methods proposed by the Committee on Uniform Tests of Cement...
Page 168 - 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 302 - This term is applied to the finely pulverized product resulting from the calcination to incipient fusion of an intimate mixture of properly proportioned argillaceous and calcareous materials, and to which no addition greater than 3 per cent has been made subsequent to calcination.
Page 298 - NaCNHJHPOj added, and ammonia drop by drop, with constant stirring until the precipitate is again formed as described and the ammonia is in moderate excess.
Page 289 - Significance. — It is generally accepted that the coarser particles in cement are practically inert, and it is only the extremely fine powder that possesses adhesive or cementing qualities. The more finely cement is pulverized, all other conditions being the same, the more sand it will carry and produce a mortar of a given strength.
Page 97 - Paragraph 58, and quickly formed into a ball with the hands, completing the operation by tossing it six times from one hand to the other, maintained 6 ins. apart; the ball is then pressed into the rubber ring, through the larger opening, smoothed off, and placed (on its large end) on a glass plate and the smaller end smoothed off with a trowel...
Page 293 - 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 304 - The cement shall be considered to have acquired its initial set when the pat will bear, without appreciable indentation, the Gillmore Mm I needle ^ in.
Page 302 - Pats of neat cement about three inches in diameter, one-half inch thick at the center, and tapering to a thin edge, shall be kept in moist air for a period of twenty-four hours.
Page 297 - HC1 which is then diluted to half strength or less, or upon the residue may be poured at once a larger volume of acid of half strength. The dish is then covered and digestion allowed to go on for 10 minutes on the bath, after which the solution is filtered and the separated silica washed thoroughly with water.