Comparative Study on Bond Behavior of Structural Concrete Made of Scoria Aggregates
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Date
2019-11
Authors
Journal Title
Journal ISSN
Volume Title
Publisher
Addis Ababa University
Abstract
Scoria aggregate is one of the most widely found natural lightweight materials in Ethiopia. This
research compares the bond behavior of reinforced concrete, produced by scoria aggregates with
normal-weight aggregate concrete. In this study, pull-out tests were performed on cubic
(150x150x150mm) and cylindrical (150x300mm) specimens, with embedded reinforcing bars
(diameter 14mm, 16mm, and 20mm). Three concrete mix types were studied having; scoria
coarse and fine aggregate (Sc-Sc), scoria coarse aggregate and natural sand (Sc-Sa), and natural
sand fine aggregate and crushed stone/gravel coarse aggregate (N). The results of the experiment
showed that scoria aggregate concrete has reasonably less bond strength as compared to normalweight
concrete. Moreover, the design bond strengths of the three concrete mixes used in the
experiment were calculated using the provisions given by the two codes, Euro code-2 and ACI318.
Then
comparison
was
done
between
the
results
of
the
two
codes
and
that
of
the
experiment.
Consequently,
the reduction in bond strength of scoria aggregate concrete obtained from the
experiment was found to be lower than the results of the two codes. This signifies that equations
given by both the ACI and Euro code are in safe range to be used for calculating the design bond
strength and anchorage length of scoria aggregate concrete.
Description
Keywords
bond, bond strength, compressive strength, slip, pull-out, scoria, tensile strength