Was andere dazu sagen - Rezension schreiben
Es wurden keine Rezensionen gefunden.
Andere Ausgaben - Alle anzeigen
acid action added aluminate American amount Analysis apparatus becomes block briquettes cause cent Chemical combination Committee commonly concrete condition considerable considered consistency Construction contain cracks depends determined diameter disintegration effect Elements employed Engineering expansion experiments final fineness free lime frequently gauging give given grains greater hardening heat hydraulic important inch increase indicate instances iron Laboratory less lime machine magnesia Manual mass material measure Mechanics method minutes mixed mixture morocco mortar mould natural nearly neat cement necessary normal observed obtained operation ordinary pass paste period placed Portland cement powder practice present produce proper properties proportion quantity recommended sand seems setting shown sieve silica slag slaking solution sometimes specifications square standard stone strength sufficient surface temperature tensile tion Treatise uniform usually varies various volume weight
Seite 307 - Surveying Instruments i2mo, 3 oo Bixby's Graphical Computing Table Paper 19^X24! inches. 25 ** Burr's Ancient and Modern Engineering and the Isthmian Canal. (Postage, 27 cents additional.) 8vo...
Seite 160 - Care should be observed in centering the briquettes in the testing machine, as cross-strains, produced by improper centering, tend to lower the breaking strength. The load should not be applied too suddenly, as it may produce vibration, the shock from which often breaks the briquette before the ultimate strength is reached.
Seite 263 - F. as practicable, and observed at intervals for at least 28 days. (c) 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. (24) These pats, to satisfactorily pass the requirements, shall remain firm and hard and show no signs of distortion, checking, cracking or disintegrating.
Seite 263 - 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.
Seite 304 - Chase's Screw Propellers and Marine Propulsion „ 8vo, 3 oo Cloke's Gunner's Examiner .' 8vo, i 50 Craig's Azimuth 4to, 3 50 Crehore and Squier's Polarizing Photo-chronograph 8vo, 3 oo * Davis's Elements of Law 8vo, 2 50 * Treatise on the Military Law of United States 8vo, 7 oo Sheep, 7 50 De Brack's Cavalry Outposts Duties.
Seite 262 - It shall develop initial set in not less than thirty minutes, but must develop hard set in not less than one hour, nor more than ten hours. TENSILE STRENGTH 22. The minimum requirements for tensile strength for briquettes one inch square in section shall be within the following limits, and shall show no retrogression in strength within the periods specified: ' Age Neat Cement Strength 24 hours in moist air 150 — 200 Ibs.