Positive Interaction of Industrial and Recycled Steel Fibres in Fibre Reinforced Concrete

Abstract

Abstract. In line with current "green" transport initiatives, Croatia plans to build over the next investment period a high speed railway line which will connect central Croatia and its capital with coastal regions of the country. According to design documents, the track system will be built using ballastless concrete solutions. In the scope of the project "Concrete track system -ECOTRACK", researchers from the University of Zagreb -Faculty of Civil Engineering analysed a new material, i.e. the rubberized hybrid fibre reinforced concrete (RHFRC), in order to find out whether its properties are adequate for the proposed concrete track system. The RHFRC contains by-products from mechanical recycling of waste tyres (rubber and steel fibres). The study of fibre and rubber interaction and their contribution to mechanical properties of the fibre reinforced concrete is presented, as extensive research on positive interaction between industrial and recycled steel fibres has not as yet been made. The results show that the RHFRC is an innovative, sustainable and cost-effective concrete, which is fully compliant with criteria prescribed in relevant standards.Keywords: fibre reinforced concrete, industrial steel fibres, recycled steel fibres, mechanical properties, recycled rubber, waste tyre.

Postcracking tensile behavior of blended steel fiber‐reinforced concrete

“…For a low dosage (<0.5% by volume) of steel fibers added in concrete, many studies have suggested that fiber addition has an insignificant effect on the compressive strength of concrete. Existing design guidelines (e.g., RILEM TC 162‐TDF and Model Code 2010) mainly focus on the tensile properties of SFRC, as in most applications (e.g., pavements and tunnel linings), the material is subjected to bending.…”

Shrinkage Behaviour of Fibre Reinforced Concrete with Recycled Tyre Polymer Fibres

“…Research presented hereafter is part of a large FP7 project, Anagennisi [16,17], where the aim of the project is to identify suitable applications for RTPF in concrete and to put an end to the current practice of landfilling this material. Based on the limited literature data [18][19][20][21], RTPF do not induce negative effects on concrete mechanical properties and could potentially have beneficial effect on controlling cracking of concrete due to different early age deformation.…”

Possibilities in concrete industry towards circular economy through industrial symbiosis

“…Opsežno istraživanje pokazalo je da se svaki od proizvoda dobivenih reciklažom otpadnih guma (slika 8) može koristiti u betonu, te istovremeno poboljšati određena svojstva betona [20][21][22][23]. U suradnji sa industrijskim partnerima, razvijena su dva inovativna proizvoda, a u sklopu novog EU projekta planira se razviti još inovativnih proizvoda, iskorištavaju pojedina svojstva reciklata automobilskih guma kako bi se pripremili specifični betonski proizvodi.…”

“…The extensive research performed on University of Zagreb Faculty of Civil Engineering implied positive effects when those are incorporated in concrete, either as replacement for raw materials or as a certain chemical admixtures [20][21][22][23]. In cooperation with industrial partners, researchers from the University of Zagreb, Faculty of Civil Engineering have developed two different construction products, which are utilising particular property of recycled tyres, to create solutions with added values on the market.…”