THERMAL EXPANSION OF CONCRETE AND REINFORCED CONCRETE

The thermal coefficient of expansion of concrete and reinforced concrete have been determined under short-term steady state temperatures, --100 to 150 F (--73 to 66C). Specimens were cured both saturated and air-dried in the laboratory and tested at 7, 28, and 84 days and at 1 year. One hundred and twenty-five 3 x 4 x 12 in. (7.6 x 10 x 30.5 cm) reinforced concrete prisms were tested for thermal coefficient of expansion. The coefficient decreased with increase in the water-cement ratio, increased with age, and was smaller below the freezing point of the concrete. The saturated concrete had lower coefficients than the air-dried concrete. Steel reinforcement ranged from 0 to about 5 percent. The coefficient for symmetrically reinforced concete increased with the steel percentage. For unsymmetrically reinforced concrete, the coefficient for the face at the steel increased and the coefficient for the opposite face decreased with increased steel. Eighty-four 6 x 12 in. (15.2 x 30.5 cm) concrete control cylinders were tested for compressive strength and static modulus of elasticity of concrete.

Media Info

Subject/Index Terms

Filing Info

  • Accession Number: 00163628
  • Record Type: Publication
  • Report/Paper Numbers: Title No. 73-52
  • Files: TRIS
  • Created Date: Oct 29 1977 12:00AM