Durability of Structural Lightweight Concrete


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Title: Durability of Structural Lightweight Concrete

Author(s): T. A. Holm and t. W. Bremner

Publication: Special Publication

Volume: 126


Appears on pages(s): 1119-1134

Keywords: concretes; density; durability; freeze-thaw durability; lightweight concretes; marine atmospheres; Materials Research

Date: 8/1/1991

Long-term durability of structural lightweight concrete used in bridges, ships, and buildings is reviewed. Particular attention is given to mature structures located throughout the world that have been subjected to severe weather conditions. Ongoing testing programs carried out on structures subjected to several decades of exposure are reported. The nature of both the vesicular lightweight aggregate itself as well as the interfacial contact zone between aggregate and cement paste matrix are analyzed, as the microstructure of lightweight concrete reveals factors that contribute to long-term durability. The information gained on the microlevel is used to explain observed performance, and provides a basis for predicting behavior. To facilitate the practical design of durable structures, long-term field exposure studies of normal weight and lightweight concretes are being conducted to assess their relative performance in a severe environment. The results obtained from ongoing testing programs conducted by the Canadian Concrete Technology Section of CANMET at the U.S. Corps of Engineers Treat Island Severe Weather Exposure Station are discussed in relation to the design process.