. Economic Papers. placed closer than one inch to the forms andspecial care shall be exercised to secure a thorough flow of concrete 52 CULVERTS AND SMALL BRIDGES FOR around and under the steel reinforcement. In splicing bars they shallbe lapped from 15 to 50 diameters, as directed by the engineer, andsecurely tied together in not less than two places with No. 12 wire. Where steel bars are shown on the drawings they shall be twistedsquare section bars, or bars of the same net sectional area with someprovision for rigid mechanical bond at frequent intervals. A slightamount of rust is not object
. Economic Papers. placed closer than one inch to the forms andspecial care shall be exercised to secure a thorough flow of concrete 52 CULVERTS AND SMALL BRIDGES FOR around and under the steel reinforcement. In splicing bars they shallbe lapped from 15 to 50 diameters, as directed by the engineer, andsecurely tied together in not less than two places with No. 12 wire. Where steel bars are shown on the drawings they shall be twistedsquare section bars, or bars of the same net sectional area with someprovision for rigid mechanical bond at frequent intervals. A slightamount of rust is not objectionable, but steel must be free from greaseand scale. Steel bars shall be of medium steel, with an elastic limit ofnot less than 32,000 pounds per square inch, and shall bend withoutfracture 180 degrees about their own diameter. Expanded metal andwire fabric shall have not less than a three inch mesh and an elasticlimit of not less than 55,000 pounds per square inch. N. C. Geological and Economic Survey. PLATE XIX. Reinforced Concrete Slab and Beam Bridge.
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