Please use this identifier to cite or link to this item: http://repo.lib.jfn.ac.lk/ujrr/handle/123456789/10043
Title: Behaviour of concrete specimens retrofitted with bio-based polyurethane coatings under dynamic loads
Authors: Somarathna, H.M.C.C.
Raman, S.N.
Mohotti, D.
Mutalib, A.A.
Badrie, K.H.
Keywords: Bio-based Polyurethane elastomer;Coating thickness :Concrete;Dynamic loading;Retrofitting
Issue Date: 2021
Publisher: Elsevier
Abstract: Experimental investigationwasconductedusingconcretespecimenstoassesstheeffectivenessofbiobasedpolyurethane(PU)coatingsynthesizedfrompalmkerneloilinenhancingthedynamicmechanical responseofconcretespecimensunderquasi-staticanddynamicloads.Thedynamicloadingcondition wassimulatedbyconductingthree-pointbendingtestsatastrainrateof0.067s 1,andsimultaneously, under quasi-static loading(strainrateof0.00033s 1)conditions .The application of PU layer(s)(either on the impact face, reface ,or on both faces of the concrete specimens)increases the dynamic resistance of theconcreteelement,whichcanbeenhancedbyincreasingcoatingthicknessoneitherfaceoftheconcreteelement.Underdynamicconditions,with10%of total coating thickness compared to the beam depth, strainduringultimatefailure,andstrainenergydensitywereenhancedsignificantlywithmarginalenhancementintheultimateflexuralstrength.PUcoatingdoesnotdebondduringultimatefailure of the test specimens which implies good adhesion characteristics, and even with minimum coating thickness(2.5%),drasticfragmentationeffectscanbereduced.Bio-basedPUisagreenmaterialandapplicationof PU coating provides available and sustainable technique for protecting concrete structures against dynamic loads.
URI: http://repo.lib.jfn.ac.lk/ujrr/handle/123456789/10043
DOI: https://doi.org/10.1016/j.conbuildmat.2020.121860
Appears in Collections:Civil Engineering



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