Accession Number : AD0622780

Title :   PHOTOELASTIC DETERMINATION OF STRAIN DISTRIBUTION IN CEMENT PASTE, MORTORS, AND CONCRETE.

Descriptive Note : Final rept. for 1 Jul 64-1 Jun 65,

Corporate Author : NAVAL CIVIL ENGINEERING LAB PORT HUENEME CALIF

Personal Author(s) : Keeton,John R.

Report Date : NOV 1965

Pagination or Media Count : 37

Abstract : The photoelastic method of stress analysis by means of transparent plastic coatings was employed to study the effects of aggregate inclusions in prisms of hardened portland cement paste, Ottawa 20-30 sand mortar, Ottawa graded sand mortar, river sand mortar, and river gravel concrete. With hardened cement paste as the reference, momuniformity of maximum shear strain distribution was found to increase with the maximum size and with the range of gradation of the aggregate particles included in the cement paste. Comparative tests revealed that strain distribution is quite different between loaded and nonloaded hardened cement paste. In a preliminary test to determine the effects of constant sustained stresses upon creep in the photoelastic coating itself, the inherent creep characteristics of the plastic coating material used in the study were found to be negligible. (Author)

Descriptors :   (*CONCRETE, STRAIN(MECHANICS)), (*CEMENTS, STRAIN(MECHANICS)), STRESSES, MATHEMATICAL ANALYSIS, PHOTOELASTICITY, DISTRIBUTION, SAND

Distribution Statement : APPROVED FOR PUBLIC RELEASE