Concrete Tolerences-Importance and Achievement in Bureau of Reclamation Construction

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Title: Concrete Tolerences-Importance and Achievement in Bureau of Reclamation Construction

Author(s): J. R. Graham and E . A . Lindholm

Publication: Journal Proceedings

Volume: 75

Issue: 2

Appears on pages(s): 49-54

Keywords: cavitation; concrete construction; construction costs; esthetics; formwork (construction); inspection; quality control; safety; specifications; structural design; supervision; tolerences (mechanics).

Date: 2/1/1978

Abstract:
Since the cost of formwork for a concrete structure may be 35 to 60 percent of the total cost of the concrete, factors which may affect its design, such as tolerences, can significantly affect the cost of the project. Tolerence requirements which are too restrictive can unnecessarily in crease form costs. On the other hand, tolerences which are not restrictive enough can produce structures not having their designed strength, can fail during operations by such conditions as cavitation erosion when subjected to high velocity flows, and do not produce asthetically pleasing structures. This paper discusses Bureau of Reclemation concrete tolerence requirements and the many factors, such as desing needs, specifications, construction quality control, and supervision that influence whether or not these tolerences are achieved. Admitting that acceptable tolerences are not always achieved, remeidal measures are briefly discussed. Illustrations demonstrate the importance of tolerences in concrete construction.