Abstract
Under the influence of aggressive environment, structural concrete could exhibit degradation in various forms. One of the symptoms of the degradation could be shown in the form of local delamination of concrete cover. Patching method could be a preference choice to repair this type of degradation to regain its structural performance and durability. This paper presents the structural behaviour of patched-reinforced concrete beam under flexural loading with particular interest on the use of unsaturated polyester resin (UPR) mortar as patch repair material. The repair area is replicated in the tensile zone of the beam. The behaviour investigated in this study is the cracking evolution of the patched – reinforced concrete beam and its effect on the deflection. It is shown that the higher strength of the UPR-mortar leads to a reduction in the intensity of cracks compared to that of un-repaired (normal) reinforced concrete beam. The lesser cracks intensity is beneficial to restore the flexural stiffness of the beam.
Highlights
Reinforced concrete (RC) beam is a part of building structural system elements, which is designed to sustain flexural and shear loading
The present of cracks certainly affects the rigidity of the beam. At this region the moment of inertia of the beam lies between the moment of inertia of gross section (Ig) and the moment of inertia of fully cracked section (Icr); the third region (III) is counted from the yield load to a failure load where the beam behaves as nonlinear elastic material
It is interesting to note that the flexural cracks appearing in the unsaturated polyester resin (UPR) mortar do not propagate to the parent concrete
Summary
Reinforced concrete (RC) beam is a part of building structural system elements, which is designed to sustain flexural and shear loading. The present of cracks certainly affects the rigidity (flexural stiffness EI) of the beam At this region the moment of inertia of the beam lies between the moment of inertia of gross section (Ig) and the moment of inertia of fully cracked section (Icr); the third region (III) is counted from the yield load to a failure load where the beam behaves as nonlinear elastic material. UPR mortar will be investigated with special interest to observe the cracking intensity and its effect on the deflection of patched-RC beam under flexural loading. For this purpose, a comparison of the load-deflection behaviour of patched-RC beam to that of normal RC beam is determined experimentally. The influence of the cracking intensity will be further examined to compare the deflection of both beams
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