STUDY OF CREEP IN CONCRETE, PHASES 3, 4, AND 5.
Abstract
Texts were made on small, rectangular, prestressed concrete beams to determine prestressing losses. It was found that data from these tests could be used to predict prestressing losses in full-sized beams. Cylindrical concrete specimens were steam cured and subjected to long-time compressive loading. It was found that creep and shrinkage was 25 to 46% less than that of normally cured concrete. It was learned that timedependent strains in concrete speciments are equal, whether they are measured end-to-end or in the central portion of the specimen. Also, results indicate that shrinkage is equal whether measured on the surface or on the inside of specimens. Shrinkage is affected by the size and shape of specimens, and loaded and nonloaded concrete cylinders lose about the same weight of water when subjected to the same storage conditions. Photoelastic coatings on concrete specimens revealed that time-dependent strain distribution is non-uniform and that large pieces of aggregate may contribute to this non-uniformity, although they are not strain centers themselves. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- May 01, 1965
- Accession Number
- AD0615521
Entities
People
- John R. Keeton
Organizations
- Naval Facilities Engineering Service Center