The factors investigated were the viscosity and the compressive strength of the adhesives during their working life, and the variation of the compressive strength of the base and overlay concrete. 2-part structural epoxy bonding agent SikaTop® Armatec®-110 EpoCem® Bonding Primer and Reinforcement Corrosion Protection Let's Build Something Amazing. Excellent Adhesion to almost all Building Materials. LTL shipping is required. 12 summarizes the results of average bond strength for each group showing that specimens with a rough surface and a rough surface with mechanical connector reviled the best bond strength results, in addition, the specimens with bonding agent yielded lower bond strength if compared to the same specimens without a bonding agent. The pull-off test involves bonding a circular steel probe to the concrete surface using an epoxy resin adhesive which is stronger than concrete in tension. Using pneumatic hammers in concrete causes a bruised surface layer and creates a zone of weakness below the interface. In addition, based on the mechanical interlocking theory of adhesion, good adhesion occurs when an adhesive penetrates the pores, holes and crevices, which lock mechanically to the substrate . There-, fore, it is not surprising that the bond strengt, explain the higher value obtained with the slant shear, specimens treated with sand blasting without epoxy, resin application relative to the value registered with, the slant shear specimens treated with sand blasting, The second objective defined was to investigate the, possibility of correlation between the slant shear, results and the pull-off test results. Later, the new concrete was added. When anal, the results, it must be remembered that the compressive, strength of the added concrete of situation 2 presented, Examining the results of the slant shear tests (Table, 1), it can be seen that the bond strength in shear was, approximately constant, and slightly superior to. It is recommended that bonding agent is applied prior to casting the fresh concrete. It can be said that the epoxy resin, application eliminated the roughness differences be-, tween the substrate surfaces in these situations. Recommended for structural crack repair for larger cracks. They can also improve water impermeability of concrete. od is adopted that adequately increases its roughness. EucoFloor Epoxy Primer. Both dry-mix and wet-mix shotcretes were used. endstream
154–163. Slant shear tests were conducted to quantify the bond strength in shear. The critical analysis lists the advantages and weaknesses of the described methods. Therefore, it is required to measure and examine the influence of the interface surface on the redistribution of the contact stresses. Among the six closure pour concrete mixes considered, one was selected that had the largest compressive and tensile strength values and the lowest shrinkage value. It is a Two Part Solvent Free Bonding Agent Composed of Liquid Epoxy Resin and Hardener. Advantages: High strength. This type of material has at times shown serviceability problems associated to dimensional instability, primarily in the form of shrinkage cracking. It was concluded that, for current undamaged columns (that is, where a bending moment-shear force ratio is greater than 1.0 m), a monolithic behavior of the composite element can be achieved even without increasing their surface roughness, using bonding agents, or applying steel connectors before strengthening it by RC jacketing. of this product is: bisphenol A-epichlorohydrin resin, with 4,4-methylene bis (cyclohexylamide), as curing, component. The study presented in this paper reveals that the added concrete, normally with higher compressive strength than the substrate concrete, may possibly have an influence on concrete-to-concrete bond strength. Epoxy 202 All Weather Concrete Bonding Agent 2/gal. Once cured, the new concrete will simply sit on top as a separate layer. Different strategies for repair and retrofit can be chosen. 75 0 obj
These, obtained with tests performed on standard cubic speci-, average value of the bond strength in tension, measur, with the pull-off test, and the theoretical value of the, tension strength of the added concrete are also indi-. The rest of this article is an in-depth guide to help provide answers to the topic question. When the hardener is mixed with the base component, a free flowing epoxy grout is produced which quickly hardens and to produce a strong bonding material. The bond strength of repair materials to the concrete substrate was investigated. Pull-off tests and slant shear tests were performed to evaluate the bond strength in tension and in shear. A commercial epoxy resin that is widely. The interface was modeled with a proper nonlinear cohesive law which couples mode I (tension-crack) with mode II (shear-slip) behaviors. K. R. In-place bond testing and surface preparation of. The bonding agent must be wet or tacky when the topping is placed. The tests have demonstrated that the laboratory-prepared ordinary portland cement concrete (PORCC) repair material compared well with the proprietary materials. between concrete substrate and repair materials. It should be mentioned that the rupture mode, five specimens of situation (1r), de-bonding of the core, occurred when executing the hole and so the corre-, surface roughness, all variables that could influence test, results were kept constant, including the concrete, the concrete constituents, their ages, and all the labora-, Table 1). Contact us. The methods adopted to in-, crease the roughness of the substrate surface, before the, application of the bonding agent, were those most com-, From the conclusions of this study, designers can, choose the best preparation technique for their sub-, strate surface in order to obtain higher bond strengths, There are some published works on adhesion of, tained by different researchers are not always in, parameters that influence the bond strength, it is not, repair system depends on the surface roughness of the, concrete substrate, the presence of micro-cracks and. Epoxy Fresh Concrete to Hardened Concrete Adhesive #2007 is a two component, 100% solids epoxy resin system designed to bond new concrete to old and other materials to concrete. An experimental study was performed to evaluate the bond strength between two concrete layers of different ages, considering different mixtures of added concrete, with different strengths. ent researchers, this test is roughness sensitive. 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