Title: Fifty Year Properties of Concrete
Author(s): George W. Washa and Kurt F. Wendt
Publication: Journal Proceedings
Appears on pages(s): 20-28
Keywords: aggregates: compressive strength: concrete durability; curing: density (mass/volume] : flexural strength; mechanical properties: physical properties; secant modulus;tensile strength: tests; volume change.
Compressive strength, unit weight, and volume changes of concrete for ages up to 50 years have been determined. Variables incuded are types of cement and coarse aggregate, mix proportions, consistency, methods of placement, and storage conditions. Over 2500 concrete cylinders, I32 concrete expansion prisms, and severa thousand mortar cylinders and briquets were made in 1910, 1923, and I937 for this program. Earlier reports on them tests were published in 1931, 1943, and 1961. Under outdoor storage in Madison the compressrve strength of concrete made with coarsely ground cements having high C2S contents generally increased as the log of the age out to 50 years, but concrete made with finer cements having relatively low C2S contents appeared to reach maximum strength at ages between 10 to 25 years and showed some retrogression thereafter.