The influence of a polyurea coating on bent reinforced concrete beams with various reinforcement ratios

Abstract

Polyurea coatings as a possible structural reinforcement system" is a research project aimed at exploring possible applications of polyurea coatings for improving structural performance (including steel, concrete, wooden and other structures used in the construction industry). As part of the project, this paper focuses on evaluating the performance of bent reinforced concrete (RC) beams covered with a polyurea coating system. Easy polyurea application and its numerous advantages can prove very useful when existing RC structural elements are repaired or retrofitted. Laboratory tests of three types of RC beams with three different longitudinal reinforcement ratios were performed for the purposes of this paper. The tests were designed to determine the bending strength, performance and cracking patterns of the coated RC beams. In addition, a theoretical model was developed to predict the impact of the polyurea coating on the bending strength of the RC beams. On this basis, the effect of the coating on the bending strength and the performance of the coated beams at the ultimate limit state (ULS) was examined and analyzed. The results showed that the use of the polyurea coating has a positive impact on the cracking state of the RC beams subject to bending and little effect on their bending strength

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“…The reinforced specimens maintained a significant amount of load-carrying capacity and flexural ductility, even after the destruction of concrete on the tensile face in the mid-span section. Furthermore, the application of polyurea coatings positively influenced the cracking state of bent RC beams, although it had a minimal impact on their flexural strength [89].…”

Flame Retardant Additives Used for Polyurea-Based Elastomers—A Review

“…Polyurea is formed by the reaction of two components: an isocyanate prepolymer and a mixture of amino-terminated resins (Figure 5) [32,33]. Both parts of the composition (isocyanate and mixture of amines) are processed under high temperature and high-pressure conditions with an appropriate proportion of the ingredients mentioned below.…”

“…Polyurea and its hybrids are usually used as waterproofing landings and foundation walls, bridge deck waterproofing, swimming pool coatings, and other concrete constructions, according to EN 1504-2. However, there are many more applications, such as roof coatings (ETAG 005-Guideline for European technical approval of liquid applied roof waterproofing kits), pipe protection, secondary containers and tank linings, automotive industry, and more [33,[37][38][39][40].…”

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“…Paper [3] by J. Szafran, A. Matusiak, K. Rzeszut, and I. Jankowiak is a report from the experimental activities of the researchers from two independent universities: the Lodz University of Technology and Poznan University of Technology. Results taken during the tests are part of the scientific project called "Polyurea coatings as a possible structural reinforcement system", which explores possible applications of polyurea coatings for improving structural performance (including steel, concrete, wooden, and other structures used in the construction industry).…”