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The purpose of this paper is to discuss the significance of currently standardized testing procedures for evaluating the resistance of concrete to weathering under service conditions. The published literature on the subject is extensive and only a somewhat superficial treatment can be given in a brief paper. The reader should consult the similar papers in earlier editions of this special technical publication by Scholer [1,2], Powers , and Arni . A monograph by Woods  presents a comprehensive picture of durability, and one by Cordon  discusses freezing and thawing in detail. Perhaps the most comprehensive treatment of the influence of aggregates on resistance to freezing and thawing is that of Larson et al . An extensive annotated bibliography on concrete durability published by the Highway Research Board (HRB) in 1957  with a supplement in 1966  contains 534 citations. Unfortunately this bibliography has not been updated. The report of ACI Committee 201 on Durability of Concrete  contains valuable recommendations for production of concrete to provide resistance to the various destructive processes encountered in field exposures. The ACI Symposium  on durability of concrete contains 17 papers on various theoretical and operational aspects of producing durable concrete.
Associate head, Virginia Highway and Transportation Research Council, Charlottesville, Va.