LAUSR

Abstract Polyurethane is an synthetic thermosetting polymers that can be used to provide the structural enhancement, optimum indoor temperature and protection against environment. In this study, the self-healing organic polyurethane is impinged on the surface of high performance reinforced concrete at three different thicknesses and the effect of coating on coarse aggregated has been reported. Firstly, the concrete reinforced with biodegradable Ananas erectifolius fiber at the varying proportions ranging from 0.5% to 2% at an increment of 0.5%. The influence of the single fiber on the compressive, tensile, and flexural strength of the coarse aggregate coated specimens were examined. The coarse aggregate coated specimen reduces the mechanical properties of the HPC owing to formation of additional layer between coarse aggregates and cement matrix. Results showed that the use of chemically treated fibers resulted in superior performance of the concrete. Besides, the addition of the polyurethane coated specimens along with fibers showed better flexural strength and decreased stiffness. At this time, 11% and 5.2% reduction in the compressive and tensile strength, 3.1% improvement in flexural strength was observed on the fiber reinforced concrete than HPC without fibers. On comparing to the uncoated HPC, the coated HPC showed a least response to the loading and the formation of the cracks on the fiber reinforced HPC.