Accession Number : AD0635055

Title :   DYNAMIC PROPERTIES OF PLAIN PORTLAND CEMENT CONCRETE.

Descriptive Note : Technical rept.,

Corporate Author : NAVAL CIVIL ENGINEERING LAB PORT HUENEME CALIF

Personal Author(s) : Cowell, Walter L.

Report Date : JUN 1966

Pagination or Media Count : 51

Abstract : Two concrete mixes (a medium- and a high-strength mix), each cured under two different conditions (73F, 100% relative humidity for 26 days followed by 2 days in a 20% RH environment or 73F, 100% RH for 28 days followed by 21 days in a 20% RH environment) were tested to determine the effect of differences in moisture content and rate of loading on their compressive and tensile strengths. The compressive tests showed the values for mechanical properties increased as the rate of loading increased. At the maximum rate of loading (approximately 2,000,000 psi/sec), the increases in compressive strength over the values for static loading for the moist, 28-day concrete were 45% for the medium-strength and 39% for the high-strength concrete. The increases for the drier, 49-day, medium- and high-strength concretes were 35% and 24%. In the splitting tensile-strength tests, at a stress rate of 300,000 psi/sec the increases in tensile strength over the static values for the 28-day concrete were 70% for the medium-strength and 67% for the high-strength mix. For the 49-day concretes, the increases were 53% for the medium-strength and 40% for the high-strength mix. Recommended percentage increases in compressive strength are given for concretes subjected to high strain rates. (Author)

Descriptors :   (*CONCRETE, *LOADS(FORCES)), CEMENTS, COMPRESSIVE PROPERTIES, TENSILE PROPERTIES, DYNAMICS, MOISTURE, STATICS, AGING(MATERIALS)

Subject Categories : Ceramics, Refractories and Glass

Distribution Statement : APPROVED FOR PUBLIC RELEASE