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ADVANCED MATERIALS FOR THE PROTECTION AND REPAIR OF CONCRETE STRUCTURES - EXPERIMENTAL ASSESSMENT
Abstract
The development and testing of advanced materials for the protection and repair of concrete structures is the main objective of the presented research. Two types of synthetic resins have been developed, applied to concrete samples and their effectiveness in improving the durability of the samples investigated has been tested. Type A is an epoxy resin with non-reactive solvents, originally designed for thin-layer surface treatment to achieve a highly closed and cross-linked surface. Type 50 is a modified low-viscosity epoxy resin of BFA (Bisphenol A) type with the content of reactive and non-reactive solvents. It is intended for impregnation of damaged concrete. Resin A was applied to reference concrete of higher strength class (CN). Type 50 was used for deep impregnation of artificially prepared -damaged- concrete (CD) samples. The experimental analysis investigated the effect of the chemical agents used on the structural, mechanical, hygric, and durability parameters of the treated concrete specimens. The use of type A epoxy resin reduced porosity, improved freeze resistance, reduced water ingress and water absorption, while maintaining adequate water vapor permeability of reference concrete CN. Similar functionality was observed for resin type 50, which also significantly improved the compressive strength of damaged concrete (CD) samples. In this case, the compressive strength improvement was approximately 51.4% and the freeze-thaw resistance coefficient after 100 freeze-thaw cycles was 102%. Considering the fact that the control CD samples were completely cracked by frost action, the improvement in the properties of damaged concrete by Type 50 epoxy resin was quite substantial and promising for full-scale application on construction sites.
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