On the other hand, the cracking pattern of PMF-strengthened beams was also improved remarkably. The ductility of strengthened beams was improved, and hence, the corresponding deflections were prolonged. As a result, the PMF-strengthened beams showed restoration and enhancement of ultimate shear load-carrying capacity by 5.90% to 12.03%. The strengthened beams were then again tested for ultimate load-carrying capacity by conducting the shear load test at a/ d = 1 and 3. The sets of remaining beams were loaded with different predetermined damage levels of 45%, 75%, and 95% of the ultimate load values and then strengthened with 20 mm thick PMF. Ultimate shear load-carrying capacity of control beams was found at two different shear-span ( a/ d) ratios 1 and 3. Forty-eight shear-designed and shear-deficient real-size beams were used in this experimental work.
The present research has been made to determine the performance of predamaged beams strengthened with three-layered wire mesh polymer-modified ferrocement (PMF) with 15% styrene-butadiene-rubber latex (SBR) polymer. Any possible strengthening of such beams is needed to be explored that could strengthen and make them fit for serviceable conditions. There is a common phenomenon of shear failure in RCC beams, especially in old buildings and bridges.
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