CORRUGATED BAR COMPANY, INC. 



GENERAL SPECIFICATONS FOR MATERIALS AND LABOR 

 USED IN REINFORCED CONCRETE CONSTRUCTION 



MATERIALS 



Cement. The cement used for reinforced concrete construction shall be Portland 

 cement which shall meet the requirements of the specifications and methods of tests 

 last adopted by the American Society for Testing Materials. 



Aggregates, (a) Fine. — Fine aggregates shall consist of uniformly graded sand 

 or screenings by particles not exceeding 3^-inch in diameter; not more than 30 per 

 cent by weight shall pass a sieve having 50 meshes per linear inch. 



Particles shall be hard and clean; shall be ffee from coatings and soluble substances; 

 shall contain no vegetable loam or other organic matter; and shall yield a 1 :3 mortar 

 of a strength at the age of seven days of not less than 70 per cent of that of 1 :3 mortar 

 of the same consistency and made with the same cement and standard Ottawa sand. 



(b) Coarse. — Coarse aggregates shall consist of gravel or crushed stone which is 

 retained on a screen having 3^-incli diameter holes and shall be graded from the 

 smallest to the largest particles. The maximum size of particles shall be determined 

 from the following table: 



Nature of work Maximum Sizes in Inches 

 Light slabs or partitions using mesh or expanded metal . . ^ 

 Flat Slab Floors, Beams and Slabs, Girders, Columns, Re- 

 taining Walls, Footings and other moderately heavy work ^ 

 Heavy work 1^ 



Size and quality of stone for rubble concrete shall meet the approval of the Engineer. 



All coarse aggregates shall be clean, hard, durable, free from coatings and all delete- 

 rious matter. 



Water. The water used in mixing concrete shall be free from oil, acid, alkali 

 or organic matter. Concrete shall not be mixed with sea water. 



Metal Reinforcement. Bars used as reinforcement in reinforced concrete work 

 shall be manufactured from new billet-steel and shall satisfy the specifications known 

 as the Manufacturers' Standard Specifications for Billet-Steel Concrete Reinforcement 

 Bars. All bars other than spiral wire shall be an approved deformed bar having a 

 positive mechanical bond with the concrete equal to that of the Corrugated Bar, 

 manufactured by the Corrugated Bar Company, Inc., Buffalo, N. Y, 



FORMS 



Character. Forms for reinforced concrete construction shall be substantial and 

 unyielding, and shall conform to the design of the structure. They shall have a smooth 

 surface in contact with the concrete, which shall be free from adhering material or 

 from other defects which shall mar the finished surface. They shall be sufliciently 

 tight to prevent the leakage of mortar. 



The forms shall be so made that all interior angles caused by the junction of slabs 

 and beams or other members shall be chamfered one inch. All exterior angles shall be 

 made square. 



Oiling and Inspection. Before placing the concrete in the forms, all debris in 

 the space to be occupied by the concrete shall be removed. Handholes shall be pro- 

 vided at the base of the forms of all columns to render this space accessible for cleaning. 



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