STRENGTHENING OF SHEAR DEFICIENT REINFORCED CONCRETE BEAMS USING POLYMER MODIFIED FERROCEMENT PMF

Abstract

Reinforced concrete (RC) beams are the workhorses of construction, but they can become susceptible to shear failure, especially older structures or those with design deficiencies. Shear failure is a sudden and brittle mode of rupture, posing a significant safety concern. This paper explores a promising technique for strengthening such beams: Polymer Modified Ferrocement (PMF).The application of PMF is relatively straightforward. The existing beam surface is prepared by removing loose concrete and roughening the surface to promote adhesion. The PMF layers are then applied, ensuring proper coverage of the critical shear zones. Curing is done under controlled conditions to optimize the properties of the polymer-modified mortar.The workability of PMF is another advantage. The polymers improve the cohesion and flowability of the mortar, making it easier to place and compact around the wire mesh. This translates to faster construction times and a smoother finish on the final product.PMF offers advantages in terms of weight reduction. The use of polymers can allow for a thinner mortar matrix compared to conventional ferrocement while maintaining the desired strength. This translates to lighter structures, reducing the dead load on foundations and potentially leading to more efficient designs.