International Library of Technology: A Series of Textbooks for Persons Engaged in the Engineering Professions and Trades, Or for Those who Desire Information Concerning Them, Volumen16International Textbook Company, 1908 |
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International Library of Technology: A Series of Textbooks for ..., Parte2 International Textbook Company Sin vista previa disponible - 2015 |
Términos y frases comunes
angle angle of repose arch ashlar bars batter blocks bottom brick broken stone built caisson called clay coefficient of friction coffer dam column composed compression construction course cracks crete cross-section crushing cubic foot culvert cylinder depth diameter distance driven durability earth engineer excavated face factor of safety filled formula foundation friction granite gravity hammer headers holes horizontal Inches Feet ingredients joints laid length less lime limestone load machine masonry material method mixed mixer mixture mold mortar piles pipe placed plumb-bob Portland cement pounds per square pressure proportion reinforced concrete reinforced-concrete resistance retaining wall rock rods rubble sand shown in Fig side slab sliding slope soft soil square inch steel strength stress structure subfoundation surface tensile tensile stress tests thickness timber tion tunnel usually values vertical weight width wire wood
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Página 5 - These pats, to satisfactorily pass the requirements, shall remain firm and hard and show no signs of distortion, checking, cracking, or disintegrating.
Página 24 - ... causes undue settlement and, possibly, cracks or distortion. The bricks should not be wetted to the point of saturation, or they will be incapable of absorbing any of the moisture from the mortar, and the adhesion between the brick and mortar will be weak. The common method of wetting brick by throwing water from buckets or spraying with a hose over a large pile is deceptive, the water reaches a few brick on one or more sides and escapes many.
Página 10 - The test pieces should be stored in moist air during the test; this is accomplished by placing them on a rack over water contained in a pan and covered with a damp cloth, the cloth to be kept away from them by means of a wire screen; or they may be stored in a moist box or closet.
Página 29 - York. *By the common method, the specific gravity equals the weight of the specimen in the air divided by the difference between the weight in air and the weight in water...
Página 28 - ... and the surface thoroughly wet. The bond and other arrangements will depend upon the circumstances of the case. The surfaces connected should be fitted as accurately as practicable, so that by using but little mortar no disunion may take place from settling.
Página 22 - GAUGED- WORK : Bricks cut and rubbed to the exact shape required. GROUT is a thin or fluid mortar made in the proportion of 1 of cement to 1 or 2 of sand. It is used to fill up the voids in walls of rubble masonry and brick. Sometimes the interior of a wall is built up dry and grout poured in to fill the voids. Unless specifically instructed to permit its use, grout should not be used unless iu the presence of the inspector.
Página 8 - ... be labelled, stating the number of the sample, the number of bags or barrels it represents, the brand of the cement, the purpose for which it is to be used, the date of delivery, and date of sampling. FORM: OF LABEL. Sample No No. of Barrels Brand To be used Delivered 18.
Página 3 - During the process of cleaning all open joints under window sills and elsewhere should be pointed. Coping : The coping of a wall consists of large and heavy stones, slightly projecting over it at both sides, accurately bedded on the wall, and jointed to each other with cement mortar. Its use is to shelter the mortar in the interior of the wall from the weather, and to protect by its weight the smaller stones below it from being knocked off or picked out. Coping stones should be so shaped that water...
Página 14 - ... the compact crystalline to the porous granular condition. The durability depends mainly on the texture; when that is compact they are extremely durable. When sand is present in the magnesian variety the weathering qualities are greatly injured. Some varieties are peculiarly subject to the attacks of sulphuric acid, which forms a soluble sulphate of magnesia easily washed away. MARBLE is the purest form of carbonate of lime (except stalactites), and is an earlier formation of limestone, with a...
Página 2 - ... exception that the mortar is omitted. They should be built according to the principles laid down for the class to which they belong. Face : The front surface of the wall. Facing: The stone which forms the face or outside of the wall exposed to view. Footing: The projecting courses at the base of a wall for the purpose of distributing the weight over an increased area, and thereby diminishing the liability to vertical settlement from compression of the ground. Footings, to have any useful effect,...