Title:
Shrinkage and Creep of High-, Medium-, and Low-Strength Concretes, Including Overloads
Author(s):
Mohammed M. Smadi, Floyd O. Slate, and Arthur H. Nilson
Publication:
Materials Journal
Volume:
84
Issue:
3
Appears on pages(s):
224-234
Keywords:
compressive strength; concretes; cracking (fracturing); creep properties; creep recovery; deformation; high-strength concretes; loads (forces); shrinkage; stresses; Materials Research
DOI:
10.14359/1967
Date:
5/1/1987
Abstract:
The influences of drying and of sustained compressive stresses, at and in excess of the normal working stress levels, on the shrinkage and creep properties of high-, medium-, and low-strength concretes were experimentally studied and compared. The 28-day compressive strength of the materials studied ranged from 3000 to 10,000 psi (21 to 69 MPa). The long-term shrinkage was found to be greater for low-strength concrete and smaller for medium- and high-strength concretes. Creep strain and normalized creep were smaller for high-strength than for concretes of medium- and low-strengths. The creep-stress proportionality limit (as a percent of fc) was higher for the high-strength concrete than for the others by about 20 percent. Data on creep recovery for the three materials are also presented.