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Abstract
For several years, the problem of durability of concrete structures was a
major topic of interest. To make durable concrete structures, sufficient compaction by
skilled workers is required. One solution for the achievement of durable concrete
structures independent of the quality of construction work is the employment of Self-
Consolidating Concrete.
Self-consolidating concrete (SCC) has recently gained significant popularity
in the precast industry in the United States and worldwide. Due to its high flowability,
SCC has been used in many precast concrete structures; especially those require
narrow forms and congested reinforcement. Nevertheless, there are still heightened
concerns regarding the bond strength of SCC to conventional steel reinforcement.
Lack of experimental data and design guidelines describing the bond behavior in SCC
create an obstacle toward an efficient use of this material.
This research presents test results of nine medium scale concrete beams
constructed with SCC and tested up to failure under four-point bending. The beams
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were reinforced with conventional steel bars spliced at the constant moment region.
The effect of different parameters believed to affect the bond strength in SCC is
discussed. The influence of the bar diameter, splice length, and confinement level
provided by the transverse reinforcement is investigated.
The applicability for various bond design hypotheses developed for
conventional concrete is examined for SCC and the limitations of some of these
expressions are highlighted.