Descriptors | Chemical composition, Drainage, Soakaways, Cements, Statistical quality control, Precast concrete, Composition, Dimensional tolerances, Inspection, Concretes, Reinforced concrete, Drainpipes, Circular shape, Construction systems parts, Thickness, Aggregates, Testing conditions, Size, Diameter, Crushing tests, Performance testing, Covers, Manholes, Specimen preparation, Concrete admixtures, Marking, Pipe couplings, Water-absorption tests, Sewers, Test equipment, Surface defects, Pipe fittings |