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3-cu yd laydown A-7 steel Academy bars bridge construction Bruckner Expressway Bureau of Public cement Chairman compressive stresses concrete placed Construction Engineer CONTINUOUS PLACEMENT contractor coordination between design costs crete culvert dead load deck concrete Department of Highways design and construction Director ditch width economical construction elevations ex officio fabrication factor of safety field finished structure finishing machine girders grade higher strength Highway Department Highway Engineer HIGHWAY RESEARCH BOARD I-beam indicated Iowa State University joints materials methods missile gap National Research Council operation oscillating transverse permit pipe placing and finishing plans plates Portland Cement Progressive deflection chart Public Roads quarter points receiving hopper reinforcing steel riding qualities screed rails set-retarding admixture sewer shear connectors span strength steel stringers struction structural decks structural slab test program theoretical three-span continuous units top reinforcement travelways trusses weldable welded width of trench yd laydown bucket