PDF Publication Title:
Text from PDF Page: 004
ApAplp.lS.cSi.c2i.02022,21,21,2x,2F8O6R7PEERREVIEW 4 o4fo2f120 (a) (b) Figure 2. (a) Injection machine. (b) Mould used for standardised test specimens. Figure 2. (a) Injection machine. (b) Mould used for standardised test specimens. 2.3.IFnibtrheisMsaencutifoanctuorfinthgePrwocoersks, the original polyethylene, which from now on will be abbreviated as “PT”, and the recycled polyethylene, which will be called “PR”, will be The manufacturing process of the polyethylene fibres started from the recycled pellets characterised; with the aim of comparing both materials and analysing their performance. that were previously characterised. The procedure carried out was as follows: the machine was switched on and the cylinder resistors were turned on to achieve the required injection 2.2. Polyethylene Properties ◦ C. The pellets were then fed into the hopper (after the temperature, in this case 230 appropriate drying) and the cylinder was filled with the required quantity. The injection EN ISO 1183-1:2019 [54] was used to determine the density of both PT and PR. To volume used here was 29 cm3. As for the pressure introduced, after several tests it was determine the tensile strength of the PR material, standardised test specimens were man- concluded that the optimum pressure to achieve a fibre with a diameter of between 1–2 mm ufactured, which were tested according to EN ISO 527-1:2012 [55]. For the PT, specimens and which also acquired a certain roughness was with a pressure of 150 MPa. Once all with a standardised geometry were die-cut and then tested in a similar way to those de- the machine settings were established, the process began, and when the injected material scribed in the previously defined standard. Finally, tensile tests were also carried out on came out, the fibre was pulled out manually, taking care not to reduce the section too much. the fibres. In this case, it was not possible to manufacture standardised specimens, so the Approximately 9 m from the machine, the bobbin (shown in Figure 3b) was placed, around EN ISO 527-1:2012 standard was adjusted as far as possible to test the fibres. which the wire was wound. Finally, a visual quality control was carried out on the fibre Appl. Sci. 2022, 12, x FOR PEER REVIEW Finally, the penetration hardness in the polyethylene was determined using th5eotfyp21e bobbins to rule out sections that did not have the appropriate section or whose surface was D durometer, see Figure 3a, as the standard EN ISO 868:2003 marks [56]. smooth, and the fibres were then cut manually to a length of 60 mm. 2.3. Fibre Manufacturing Process The manufacturing process of the polyethylene fibres started from the recycled pel- lets that were previously characterised. The procedure carried out was as follows: the ma- chine was switched on and the cylinder resistors were turned on to achieve the required injection temperature, in this case 230 °C. The pellets were then fed into the hopper (after the appropriate drying) and the cylinder was filled with the required quantity. The injec- tion volume used here was 29 cm3. As for the pressure introduced, after several tests it was concluded that the optimum pressure to achieve a fibre with a diameter of between 1–2 mm and which also acquired a certain roughness was with a pressure of 150 MPa. Once all the machine settings were established, the process began, and when the injected material came out, the fibre was pulled out manually, taking care not to reduce the section too much. Approximately 9 m from the machine, the bobbin (shown in Figure 3b) was placed, around which the wire was wound. Finally, a visual quality control was carried out on the fibre bobbins to rule out sections that did not have the appropriate section or (a) (b) whose surface was smooth, and the fibres were then cut manually to a length of 60 mm. Figure 3. (a) Shore hardness meter type D. (b) Bobbin with valorised material. Figure 3. (a) Shore hardness meter type D. (b) Bobbin with valorised material. 2.4. Characterisation of Recycled Fibres The polymer fibres used in concrete must fulfil both the mechanical and geometric performance requirements of the EN 14889-2:2008 standard [57]. A random sample of 100 fibres was used. Due to their surface irregularity, three diameter measurements were taken along the entire length of the fibre and the average was calculated. Moreover, aPDF Image | Recycled Polyethylene Fibres for Structural Concrete
PDF Search Title:
Recycled Polyethylene Fibres for Structural ConcreteOriginal File Name Searched:
applsci-12-02867.pdfDIY PDF Search: Google It | Yahoo | Bing
Development of a solar powered Electric Ship The Electricship website originally started off as a project to develop a comprehensive renewable, affordable, modular electric ship... More Info
Modular Boat Hull Composite The case for a unsinkable, modular composite hybrid boat hull... More Info
MS Burgenstock Hybrid Electric Catamaran Lake Lucerne Unique shuttle servicing Lucerne to the Burgenstock Resort... More Info
Ground Power Unit GPU Powered by Lithium Ion Batteries The goal of the Ground Power Unit is to provide a readily accessible, modular, ready-to-power solution for remote power... More Info
CONTACT TEL: 608-238-6001 Email: greg@electricship.com (Standard Web Page)