Abstract
Composite action of any reinforced concrete member is only possible if sufficient bond
strength exists between steel reinforcing bars and concrete, which can adequately transfer
shear stress between them. Bond strength is a function of compressive strength of concrete
and hence high strength concrete has higher bond strength [1-2]. Therefore required
development length can be reduced. In order to investigate the effect of development length on
bond stress and slip relationships, experimental investigation was carried out. In this
experimentation 24 pull-out samples of high strength concrete and normal strength concrete
were casted and tested. The results of this investigation revealed that by increasing the
development length from 5db to 10db bond strength increases for both high and normal
strength concrete as shown in Figure 11, 12 and 13. However incase of normal strength
concrete increase in bond strength is more compared to that in high strength concrete as it is
clear from Figure 11 and Figure 13. The increase in bond strength is observed even at 10db
development length but the extent is less for 19 mm than 16 mm bars as shown in Figure 12
and Figure 13. This is in agreement with the earlier findings of Chen et al [3] and Harajli et
al [1]. However incase of HSC the total slippage at 10db is 50% greater than at 5db. This may
be due to the fact that more no of concrete keys participate in resisting the slippage.
K. Ahmed, Z. A. Siddiqi, M. Yousaf. (2007) Slippage of Steel in High and Normal Strength Concrete, Pakistan Journal of Engineering and Applied Sciences, Volume 1, Issue 1.
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