Bond Strength of Tension Lap-Splices in Full Scale Self-Compacting Concrete Beams

Kâzım TÜRK

Article Details

Bond Strength of Tension Lap-Splices in Full Scale Self-Compacting Concrete Beams

Authors:

Kâzım TÜRK

Publisher:

TUBITAK

Journal:

Turkish Journal of Engineering and Environmental Sciences 2008 Vol.32 Issue 6, pp.377-386

Document Type:

Article

Publication Date:

5/2008

Document Language:

Turkish

Document ID (Org No.):

2000744811

Frequency:

Tri-annual

eISSN:

1303-6157

pISSN:

1300-0160

Abstract:

 

Twelve full-scale beam specimens (2000 \times 300 \times 200  mm) were tested in positive bending with the loading system designed  to determine the effect of self-compacting concrete (SCC) and the  diameter of reinforcement on bond-slip characteristics of tension  lap-slices.  The specimens of lap-splice series were tested with  lap-spliced bars centred on the midspan in a region of constant  positive bending.  The splice length of the deformed bars was set at  310 mm in all beam specimens.  This value was selected to develop a  steel stress less than yield to ensure splitting mode failure in all  beam specimens.  The beams were cast with the 16 and 20 mm bars (the  tension lap-splices) in the bottom position.  The casting procedure  was the same for all beams.  Two types of concrete were used in the  experimental programme, including normal concrete (NC), with a slump  less than 68 mm, as the comparatively low-slump concrete, and SCC as  an extremely high-workability concrete.  The variables used in this  study were the concrete type (SCC and NC) and reinforcing bar size (16  and 20 mm).  It was found that as the diameter of the steel bar  increased from 16 to 20 mm the bond strength decreased regardless of  concrete type.  Finally, although the compressive strength of  concretes was almost the same and there were slight differences  between the diameters of lap-spliced bars, the normalised bond  strengths of the SCC mixes were about 4% higher than those of the  NC mixes for both bar diameters, indicating that the reinforcing bar  was completely covered by SCC due to its filling ability.

 

Twelve full-scale beam specimens (2000 \times 300 \times 200  mm) were tested in positive bending with the loading system designed  to determine the effect of self-compacting concrete (SCC) and the  diameter of reinforcement on bond-slip characteristics of tension  lap-slices.  The specimens of lap-splice series were tested with  lap-spliced bars centred on the midspan in a region of constant  positive bending.  The splice length of the deformed bars was set at  310 mm in all beam specimens.  This value was selected to develop a  steel stress less than yield to ensure splitting mode failure in all  beam specimens.  The beams were cast with the 16 and 20 mm bars (the  tension lap-splices) in the bottom position.  The casting procedure  was the same for all beams.  Two types of concrete were used in the  experimental programme, including normal concrete (NC), with a slump  less than 68 mm, as the comparatively low-slump concrete, and SCC as  an extremely high-workability concrete.  The variables used in this  study were the concrete type (SCC and NC) and reinforcing bar size (16  and 20 mm).  It was found that as the diameter of the steel bar  increased from 16 to 20 mm the bond strength decreased regardless of  concrete type.  Finally, although the compressive strength of  concretes was almost the same and there were slight differences  between the diameters of lap-spliced bars, the normalised bond  strengths of the SCC mixes were about 4% higher than those of the  NC mixes for both bar diameters, indicating that the reinforcing bar  was completely covered by SCC due to its filling ability.

Article Details

Bond Strength of Tension Lap-Splices in Full Scale Self-Compacting Concrete Beams

Authors: Kâzım TÜRK

Publisher: TUBITAK

Journal: Turkish Journal of Engineering and Environmental Sciences 2008 Vol.32 Issue 6, pp.377-386

Document Type: Article

Publication Date: 5/2008

Document Language: Turkish

Document ID (Org No.): 2000744811

Frequency: Tri-annual

eISSN: 1303-6157

pISSN: 1300-0160

Issues

Authors:

Kâzım TÜRK

Publisher:

TUBITAK

Journal:

Turkish Journal of Engineering and Environmental Sciences 2008 Vol.32 Issue 6, pp.377-386

Document Type:

Article

Publication Date:

5/2008

Document Language:

Turkish

Document ID (Org No.):

2000744811

Frequency:

Tri-annual

eISSN:

1303-6157

pISSN:

1300-0160