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AASHO accidents aggregate asphalt asphaltic concrete axle loads base course Benkelman bituminous blades bleeding bolted joint braking Bureau of Public Calcium Chloride California cars Chairman cities clay Coignet compaction compressive concrete pavement construction cost cracks crete deflection Department of Highways Development Drainage driver education effect elastic Engineer equipment flexible paving heat Highway Department Highway Research Abstracts Highway Research Board Illinois increase Iowa Iowa State College January joints Kansas laboratory layer liquid loaded area material measurements mechanical subgrade ment method Minnesota modulus moisture motor November obtained operation P. M. SESSION parking facilities percent plunger Poisson's ratio Portland Cement Public Roads reinforced concrete Report of Committee road surface rubber sand shearing stress Skid Resistance slab Special Papers speed Stabilization steel street subgrade temperature test sections thickness tion tires traffic transportation truck values vehicles water-cement ratio wheel load