Characterisation of polyurethane coating on high performance concrete

Researchers report on a polyurethane coating reinforced with chemically treated Ananas erectifolius fiber.

Concrete was reinforced with biodegradable Ananas erectifolius fiber at the varying proportions. Image source: Pexels - Pixabay (symbol image).

In the study, the self-healing organic polyurethane was impinged on the surface of high performance concrete (HPC) 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.

Better flexural strength and decreased stiffness

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.

The study has been published in Progress in Organic Coatings, Volume 150, January 2021.

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