Improve the bonding material properties used to strengthen concrete beams

Abstract

The subject of the research deals with the study of the effect of recycling and addition of some cheap and locally available materials on the properties of the adhesive material (Epoxy) used to strengthen concrete beams. Where the study included the addition of glass powder, brick powder and porcelain powder to the adhesive material and with different ratios of the weight of the adhesive material (0, 0.25, 0.5, 0.75, 1 and 1.25). After conducting laboratory tests proved the results of the study that the best types of additions are porcelain powder and the best ratio of adding was about ( 0.25). This addition to the adhesive material in this ratio led to improve the reaction temperature at mixing the parts of the adhesive material where decreased by 15.56%, as well as improved workability through lower flow of the consistency of adhesive material about 7.89%, as increased compressive strength by 13.33% and improved the modulus of elasticity by11% only, but The modulus of rupture decreased by 7.04% and the strength to high temperatures (limit to 250C°) decreased by 29.17%. The new bonding material was tested to strengthen the CFRP concrete beams. The results showed that the compressive strength of these beams increased by 70.97% compared to the normal non-reinforced beams and the strength of the Toughness beams increased by 61.87%.
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Concrete Beams Strengthened with Jute Fibers

“…This is may be due to a relatively low tensile strength of jute fibers as compared to the carbon fibers. Most previous research and studies indicate that the tensile strength of the untreated jute fibers does not exceed 200 MPa, while for the carbon fibers it may reach 5 times its value in reinforcement steel [22]. Figure 8 indicated that increasing the width of jute fiber to 15 cm leads to increase the load carrying capacity of beams by 11.12% as compared with the reference beams.…”

“…A type of artificial fibers widely used, consisted of 99% dark carbon with a density of 1790 kg/m 3 and tensile strength of 3900 MPa, available on the local markets in the form of roll with 45.7 m length and 305-610 mm width. It is usually used in reinforcing concrete and steel structure to increase shear and flexural strength [22].…”

“…EpoxyEpoxy used in this research is commercially known as Sikadur®-31, with medium viscosity and density of 1.31 kg/L, combined of the resin substance (Resin A) and the hardening material (Hardener B). The mixing ratio is 1:3 (i.e., the mixture obtained by mixing (1 Kg) of the hardener (B) with (3 Kg) of the glue substance (A)[22].…”