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abrasion accidents amount asphalt asphaltenes average beams bituminous calcium chloride cement concrete cent chert coarse aggregate compressive strength Concrete Pavement CONSTITUTION AVENUE cost cracks crete curing curves cylinders determine diameter driver effect emulsion Engineer expansion joints F. H. Jackson feet filler gallon grade grams gravel high early strength Highway Department HIGHWAY RESEARCH ABSTRACTS Highway Research Board HIGHWAY RESEARCH INFORMATION inch increase intersection investigation laboratory lamps light limestone load machine maintenance material maximum method miles per hour mixture mortar motor vehicle NATIONAL RESEARCH COUNCIL particles paving Portland Cement pounds properties ratio RESEARCH INFORMATION SERVICE resistance road surface Roadside Development roadway rubber samples sand slabs slag snow sodium sodium vapor lamps soil specific gravity specimens speed square yard stability stone strength cements subgrade temperature traffic truck viscosity volume change water-cement ratio wheel