Accession Number : ADA180544

Title :   Microcracking and Behavior of High-Strength Concrete Subject to Biaxial Tension-Compression Stresses.

Descriptive Note : Final research rept. 15 Jun 85-14 Jan 87,

Corporate Author : TEXAS UNIV AT AUSTIN DEPT OF CIVIL ENGINEERING

Personal Author(s) : Calixto,Jose' ; Briggs,Benjamin H. ; Carrasquillo,Ramon L. ; Fowler,David W.

Report Date : 31 MAR 1987

Pagination or Media Count : 109

Abstract : Research at The University of Texas has been conducted to determine the properties and micro-cracking behavior of high-strength concrete subjected to biaxial tension-compression stresses. Static tests and microcrack mapping was performed on 35 specimens which consisted of 5-in. square x 1/2-in. thick plates cut from concrete beams. Tests were performed in a biaxial test machine developed at The University of Texas. The primary variables studied were the discontinuity and ulitimate stress levels at each stress ratio. The microcrack patterns and total crack lengths at various pre-and post-discontinuity stress levels were mapped and recorded. Results indicated that even small amounts of tensile stress reduced stress reduced the ultimate compressive strength of the specimens dramatically. The uniaxial strength of the plates was 75 percent that of standard 4-in. x 8-in. cylinders when both were tested at 172 days after casting. Young's modulus of elasiticity was found to be 3 percent higher for specimens loaded in tension than compression. Keywords: Biaxial tests, High strength, Concrete microcracking,

Descriptors :   *CONCRETE, HIGH STRENGTH, MICROCRACKING, TEST AND EVALUATION, TENSILE STRENGTH, STATIC TESTS, BIAXIAL STRESSES, STRESS ANALYSIS

Subject Categories : Ceramics, Refractories and Glass

Distribution Statement : APPROVED FOR PUBLIC RELEASE