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Pesic N, Zivanovic S, Garcia R & Papastergiou P (2016) “Mechanical properties of concrete reinforced with recycled HDPE plastic fibres”, Construction and Building Materials, 115(15 July), 362-370, doi: 10.1016/j.conbuildmat.2016.04.050 Mechanical properties of concrete reinforced with recycled HDPE plastic fibres Ninoslav Pesˇic ́a,, Stana Zˇivanovic ́a, Reyes Garciab, Panos Papastergioub aUniversity of Warwick, School of Engineering, Coventry, CV4 7AL, United Kingdom bUniversity of Sheffield, Dept. of Civil & Structural Engineering, Sheffield, S1 3JD, United Kingdom Abstract This work investigates potential engineering benefits of the pioneering application of simply extruded recycled high-density polyethylene (HDPE) plastic fibres in structural concrete. Me- chanical and serviceability properties of concrete are studied through the testing of seven se- ries of specimens: one made of the plain concrete and, for each of the two fibre diameters Ø1 = 0.25 mm and Ø2 = 0.40 mm, three series with 0.40%, 0.75% and 1.25% volume fraction of fibres. While the compressive strength and the elastic modulus of concrete were unaffected, the tensile strength and flexural (rupture) modulus were marginally increased, between 3% and 14% in the presence of HDPE fibres. Fibres mainly contributed by providing the post-cracking flexural ductility and through improving serviceability properties of concrete such as the re- duced plastic shrinkage cracking, drying shrinkage and water permeability. The durability of HDPE fibres was assessed by means of the scanning electron microscope (SEM) imaging that showed no signs of their chemical deterioration in concrete. All findings suggest that recycled HDPE fibres can be instrumental in creating a new value chain in construction industry while also positively contributing to its environmental performance. Keywords: fibrereinforcedconcrete,HDPEplastic,experimentaltesting,ductility,recycling. 1. Introduction Recent developments in the technology of concrete and demands for delivering more eco- friendly and sustainable construction projects gave rise to the idea of disposing post-consumer waste polymers into structural concrete. The two directions that emerged in practice and re- search are utilisation of the raw plastic granulate as partial substitute for sand aggregate [1–5] whereby concrete is used as a medium for disposal of polymer waste (in the amounts that do not significantly affect its strength) and the other is the use of processed resins for production of polymer concrete [6, 7]. However, knowing that concrete reinforced with commercially avail- able steel or poly-propylene (PP) fibres is a more resilient building material than plain concrete [8, 9], another promising option is recycling of plastic for production of fibres to be used as secondary reinforcement for concrete along the traditional steel rebars. Fibre reinforced concrete (FRC) has favourable properties like, for example, reduced shrink- age and increased flexural toughness/ductility, tensile fatigue strength, fracture energy and re- sistance to the explosive spalling at elevated temperatures. Applications of FRC cover variety Preprint submitted to Elsevier April 16, 2016PDF Image | Mechanical properties of concrete reinforced with recycled HDPE
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