Title: Recent Changes in Corps of Engineers Concrete Construction Specifications
Author(s): George L. Otterson and Woodrow L. Burgess
Publication: Journal Proceedings
Appears on pages(s): 721-727
Keywords: no keywords
Describes Corps of Engineers documents which contain concrete construction policies of that organization. A recent change is the preparation of two guide specifications permitting the selection of provisions best adapted to the project and aimed at greater uniformity in similar jobs. Control measures for aggregate gradation, particle size, and uniformity are varied with the use of these materials in lean mass concrete or high-cement-factor concrete. Type II cement is generally specified although other types may be used where job conditions require them or costs permit their use. Limits for air entrainment are raised to a range of 4 to 7 percent induced by the addition of air-entraining aclmixtures at the mixer, water curing of concrete is the general practice with pigmented membrane curing compounds permitted where job conditions make water curing impractical. Several classes of formed surfaces, depending on structural requirements, are specified and three types of control measures are provided for, depending on the type of structure. Conditions are also set down for mixing plant, reinforcing steel, water stops and prepacked concrete.