Creep of Mass Concrete at High Temperature


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Title: Creep of Mass Concrete at High Temperature

Author(s): K. W. Nasser and R. P. Lohtia

Publication: Journal Proceedings

Volume: 68

Issue: 4

Appears on pages(s): 276-281

Keywords: compressive strength; concretes; creep properties; creep rate; creep recovery; curing; high temperature; mass concrete; pressure vessels; research; stress-strength ratio; temperature,

Date: 4/1/1971

Test results of creep and creep recovery of mass concrete, which were tested at seven different temperatures 35 to 450 F ( I .7 to 232 C) and under three stress levels ( 1000 to 3000 psi) (70.3 to 2 IO.9 kgf/cm2) are presented. Creep in general increased with temperature in some inconsistent way. The rate of creep after 21 days of loading increased with temperature to about 160 F (71 C) but decreased with a further rise in temperature up to 450 F (232 C). Creep strains varied linearly with stress strength ratios of 20 to 70 percent. Creep recovery was independent of temperature but not of stress. The creep mechanism is discussed in some detail.