Title:
Structural Performance and In-Place Properties of Self-Consolidating Concrete Used for Casting Highly Reinforced Columns
Author(s):
Kamal H. Khayat, Patrick Paultre, and Stephan Tremblay
Publication:
Materials Journal
Volume:
98
Issue:
5
Appears on pages(s):
371-378
Keywords:
admixture; consolidation; ductility; high-performance concrete; workability.
DOI:
10.14359/10726
Date:
9/1/2001
Abstract:
This paper compares the mechanical performance of highly confined columns cast using the conventionally vibrated normal concrete (NC) and self-consolidating concrete (SCC) with stirrup configurations representing different degrees of confinement. A total of eight columns with a standard compressive strength of 40 to 50 MPa were tested. Two pairs of columns were cast using NC and SCC in reinforced sections, and four companion columns were cast without any reinforcement. One column from each pair of unreinforced columns was tested in uniaxial compression to determine the load-carrying capacity; the other provided core samples to determine the homogeneity of the distribution of compressive strength and modulus of elasticity along the height. The core results were compared to strengths obtained from control cylinders cured under similar conditions. Test results show that the SCC columns developed similar stiffness, but approximately 7% lower load-carrying capacity than NC. This spread in strength is partly due to the 10% lower cylinder compressive strength of SCC. Depending on the stirrup configuration, SCC columns exhibited 62 and 23% greater ductility than similar NC columns. The distribution of in-place properties along the height of nonreinforced columns was found to be more homogeneous in SCC than NC. Compared to standard cylinders, SCC had approximately 10% greater spread in compressive strength reflecting a lower degree of consolidation compared to NC.