Creep Recovery of Concrete Subjected to Multiaxial Compressive Stresses and Elevated Temperatures

Details

• Creators:
  Hijazi, Amin ; Kennedy, Thomas W.
• Corporate Creators:
  University of Texas at Austin
• Corporate Contributors:
  Oak Ridge National Laboratory ; Union Carbide Corporation. United States Atomic Energy Commission
• Subject/TRT Terms:
  Concrete Structures Creep Properties Mechanical Relaxation Nuclear Reactions Poisson Ratio Strain (Mechanics) Stresses Temperature
• Publication/ Report Number:
  3661-1
• Resource Type:
  Research Paper
• Geographical Coverage:
  United States
• Corporate Publisher:
  University of Texas at Austin
• Abstract:
  This report presents the findings of an experimental investigation to evaluate the effects of three different factors on the instantaneous and creep recovery strain of plain concrete after being subjected to sustained loads for a period of one year. The factors investigated were (1) temperature during the loading and unloading periods (75° F and 150° F); (2) curing history (as-cast and air-dried); and (3) state of stress, which varied from 0 psi to 3600 psi in both the axial and radial directions. This experiment consisted of applying compressive loads along the three principal axes of cylindrical concrete specimens for a period of one year, after which the loads were removed and creep recovery strains were observed for an additional five months. The loads were applied by means of a hydraulic loading system that permits independent variations of loads along the axial and radial axes allowing triaxial, biaxial, and uniaxial states of stress. The strains were measured using vibrating wire strain gages that were cast in the concrete specimens along the axial and radial axes. The effect of each of the above factors on the creep recovery strain was evaluated separately, after which a comparison of the different relations between strains during the loading period and strains during the unloading period was made. In addition, Poisson's ratio during the recovery period and the applicability of the principle of superposition of strains were evaluated and are discussed briefly.
• Format:
  PDF
• Funding:
  2864
• Collection(s):
  US Transportation Collection
• Main Document Checksum:
  urn:sha-512:877a1e1b901428bab441423538ad5484d904f58cdcb8f9e4bd053c3508fa86bdb038250b6ab9a38cf32a9ae118dd2a79272a6a7086c5ea1ce006b407dd7d85a1
• Download URL:
  https://rosap.ntl.bts.gov/view/dot/86952/dot_86952_DS1.pdf
• File Type:
  [PDF - 6.32 MB ]