OVERVIEW OF THE DIFFERENT METHODS FOR REPAIRING CONCRETE SLABS

Document Type : Original Article

Authors

1 Civil Engineering Department, Faculty of Engineering, Sinai University, Alarish, Egypt

2 Civil Engineering Department, Al-Azhar University, Cairo, Egypt

Abstract

The objective of this research paper is to explore various techniques for repairing concrete components, specifically slabs. Based on the test results, the MA-UFRP system was found to enhance the flexural strength of the slabs by up to 43%. The average strength of the MA-UFRP reinforced slabs was 18% lower than the EB-FRP reinforced slabs with end anchoring, but only 10% lower than the EB-FRP reinforced slabs without the final anchor. When comparing The midpoint of the span divergence of the slabs reinforced with the MA-UFRP system to those reinforced with EB-FRP without end anchorage, it was discovered that the former exhibited an average increase of 56%, while the latter showed a 5% increase, and the control group exhibited only a 15% decrease.The utilization of FRP systems significantly increased the structural ability of the original slabs for retrofitting purposes, with an enhancement of up to 500% for unreinforced specimens and 200% for steel-reinforced specimens. The average stress and slab stiffness in the shear modulus of concrete when steel rods are present and (FRP) were notably lower, often by more than 30%. Additionally, the use of Georide in repairing concrete slabs has demonstrated positive outcomes. Geogrid-reinforced slabs exhibited a 25% increase in load-carrying capacity, a 6.5% increase in deflection, and a 23% increase in energy absorption. Furthermore, when compared to steel-reinforced slabs, the geogrid-reinforced slabs displayed a 25% increase in load-carrying capacity, a 6.5% increase in deflection, and a 23% increase in energy absorption.

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