EFFECTS OF AXIAL RESTRAINT ON LENGTH CHANGE OF EXPANDING MORTAR BARS.

Abstract

An investigation was conducted to determine the effects of axial restraint on length change of mortar prisms tending to expand due to alkali-silica reaction. Three approaches were taken. The first involved use of external restraint on expansive mortar prisms. Restraining rigs consisted of aluminum rods held in place by steel header plates and load cells for determining stress caused by expansion. The next approach involved use of polyester laminated strain gages embedded axially in expansive prisms for determining stress. Restraint was provided by external frames. The third approach involved use of axially embedded calibrated steel restraining rods with end plates screwed on the ends of each rod. Linear expansion was reduced 80, 90, and 94% by the three restraints. Tests of cubes sawed from the prism after 1-yr exposure indicated that restraint had little or no effect on compressive strength. (Author)

Document Details

Document Type
Technical Report
Publication Date
Jul 01, 1969
Accession Number
AD0692300

Entities

People

  • Billy J. Houston

Tags

Communities of Interest

  • Weapons Technologies

DTIC Thesaurus Topics

  • Aluminum
  • Cells
  • Compressive Strength
  • Gages
  • Instrumentation
  • Load Cells
  • Measuring Instruments
  • Polyesters
  • Strain Gages

Readers

  • Explosive Engineering.
  • Pavement Materials Engineering.
  • Structural Health Monitoring of Composite Structures.