چكيده به لاتين
Nowadays, one of the drawbacks through the concrete structures is necessity to change or repair the part of structure without collapsing it. This decade, new method is introduced to engineers to solve this and pay not much expense. Injectable adhesive for anchoring rebar in concrete is easiest and most economical way for this purpose that make an enormous adhesion between bar and concrete. To approach to optimized adhesive formulation, different resin type such as aliphatic, multifunctional bisphenol A diglycidyl ether, tow types of amine hardeners, microsilica with variety of sizing, Nano-silica and Nano-Carbonate are used. In this research, Effect of different hardeners, Effects of adding micro and nano on adhesion and effect of adding nano material such as Nano-Silica, Nonocarbonate calcium and their concentration on tensile and flexural strength are obtained. Comparison between Nanocomposite epoxy adhesive and neat epoxy composite is the important part of this study. Many analysis and tests are employed for this study. For example, Mechanical and adhesion properties of adhesive are determined by mechanical testing and pull-out test respectively. In addition, determination of curing temperature of composites by DSC, thermal stability and morphology structure by TGA and FTIR and failure structure morphology is shown by SEM. In comparion of Mechanical and pull-out tests results, it can be concluded that samples with highest tensile and flexural modulus, have more adhesion properties compared with other samples. So Modulus is an important parameter which can predict the adhesion property without pull-out test.Samples with micro-nano particles show 10-40% less mechanical and adhesion properties in camparison with nanoparticle samples. In addition, investigation of mechanical and adhesion properties are illustrated that samples with nanocarbonate calcium has better properties than samples with nano-silica. results about synthesis of the adhesive composite are shown that %90 and %7 increase in elastic modulus and pull-out strength in ultimate synthetic adhesive respectively in compared with similar industrial adhesive. Optimized setting time and water to cement ratio of concrete for this research are 28 days and 0.45.
