THE EFFECT OF MOISTURE CONTENT ON THE MECHANICAL BEHAVIOUR OF CONCRETE EXPOSED TO ELEVATED TEMPERATURES

Concrete specimens were exposed either to thermal cycles of 70-300-70 degrees F or to a sustained temperature of 300 degrees F. During these thermal exposures, varying amounts of moisture were permitted to escape from the concrete. The moisture condition of the concrete during thermal exposure has a significant effect on its mechanical characteristics. A maximum loss of about 75 percent in strength and 55 percent in modulus of elasticity was obtained for a concrete which lost approximately 50 percent of its free water. When most of the moisture escaped early during the thermal exposure, however, the mechanical properties were not significantly affected. Thermal cycling produced permanent expansions of the concrete. The higher the moisture content of the concrete, the larger its residual expansion.

Media Info

  • Features: Figures; References; Tables;
  • Pagination: p. 203-213

Subject/Index Terms

Filing Info

  • Accession Number: 00084107
  • Record Type: Publication
  • Source Agency: Transport and Road Research Laboratory (TRRL)
  • Report/Paper Numbers: Conf Paper
  • Files: ITRD, TRIS
  • Created Date: Jun 10 1975 12:00AM