Title:
Drying Shrinkage of Ready-Mixed High-Performance Concrete
Author(s):
Elie El Hindy, Buquan Miao, Omar Chaallal, and Pierre-Claude Aitcin
Publication:
Materials Journal
Volume:
91
Issue:
3
Appears on pages(s):
300-305
Keywords:
curing; drying shrinkage; high-performance concrete; ready-mix concrete; shrinkage; silica fume; Materials Research
DOI:
10.14359/4292
Date:
5/1/1994
Abstract:
The paper reports on drying shrinkage undergone by ready-mixed high-performance concrete (HPC). Shrinkage measurements were carried out on concrete specimens as well as instrumented reference columns. Two different HPCs were tested. The first had a compressive strength of 98 MPa (14,200 psi) at 91 days, and the second had a compressive strength of 80 MPa (11,600 psi). Additionally, the first contained silica fume and the second did not. The effects of the following factors were investigated: curing time, curing conditions, silica fume content, and water-cementitious materials ratio. It was found that the longer the curing time, the lower the drying shrinkage, and that the lower the water-cementitious materials ratio, the lower the drying shrinkage. Drying shrinkage of small specimens was compared to that of actual large-size columns made with HPC. It was found that shrinkage measured by conventional laboratory tests overestimates shrinkage of HPC in actual structures. The validity of the ACI expression, derived for ordinary concrete to predict drying shrinkage of HPC, was also investigated. It was found that this expression can be used for high-performance concrete only if new parameter values are considered.