engleski

Properties of Sprayed Concrete with Recycled Tyre Polymer Fibres

Sprayed concrete offers a number of advantages over cast-in situ concrete ; reduction or elimination of formwork, rapid placement of large volumes, good bond to substrate and between layers etc. Due to the large exposed surface, sprayed concrete often has pronounced shrinkage. To eliminate negative effects from shrinkage, different types of polypropylene fibres (PP) are used. With the development of environmental awareness, there is a growing interest in finding alternatives to disposal of waste tires and their incineration for energy purpose. The main aim of this study is to assess effectiveness of recycled tyre polymer fibres (RTPF) as reinforcement in concrete. In the framework of this study, wet-mixed sprayed concrete with RTPF and PP fibres (dosages 0.9 and 1.8 kg/m3) together with the control mix without fibres were manufactured and tested. Following properties of wet-mixed sprayed concrete were tested: density, fresh concrete consistency, compressive strength, flexural strength and capillary absorption. Analysis of the results indicates that RTPF can be used as substitution of PP fibres (length/diameter = 6 mm / 32 μm), since they do not impair sprayability or pumpability of sprayed concrete at the same time assuring beneficial properties of concrete.

sprayed concrete; polypropylene fibres; recycled tyre polymer fibres

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