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Appl. Sci. 2022, 12, 2867 14 of 20 tend to reduce these properties, always considering that they are theoretical curves and that there will be a limit to the volume of fibres. Connecting the porosity and the density of HRC and HRFP-4, it can be deduced that, just as the paste fills the gaps in the concrete, the fibres fill the gaps between the aggregates. Therefore, the reduction in porosity leads to a reduction in the number of gaps; this leads to a slight increase in the mass (concrete + fibres) for the same volume of specimen, which would explain the slight increase in the bulk specific gravity of HRFP-4. In the case of HRFP-2, although there is also a decrease in porosity, the apparent density is practically Appl. Sci. 2022, 12, x FOR PEER REVIEW 15 of 21 the same as that of HRC; this effect may be due to the fact that the polyethylene fibre has a 3 lower density than that of the concrete. 6 y = 5.338e+0 * e^(-5.817e-2x) R2= 8.049e-1 y = 2.444e+0 * e^(-6.375e-2x) R2= 8.855e-1 2.5 5 24 1.5 3 12 0.5 1 00 012345 012345 Concrete / fibre volume ratio (cm 3/m3) Concrete / fibre volume ratio (cm 3/m3) (a) (b) Figure 14. Comparison of the absorption (a) and the porosity (b) of the concrete as a function of the Figure 14. Comparison of the absorption (a) and the porosity (b) of the concrete as a function of the concrete/fibre volume ratio. Table 6sshhoowssththeeveovloultuiotinonofotfhethmeemcheacnhiacnalicparlopreortpiesrtoiefsthoef tthreethdreseigdnesdigcnoend- croentcerse.tes. concrete/fibre volume ratio. 3.4.3. Mechanical Properties Table 6. Concrete mechanical properties. Table 6. Concrete mechanical properties. Mix HFC HRFP-2 HRFP-4 (MTPean) sileTeSnpsliilettSinpglitStitnregnSgtrtehn(gMthP(aM) Pa) 26.01 2.02 2.02 27.16 2.07 2.07 27.52 2.99 2.99 28.84 2.20 2.20 28.17 2.78 2.78 2.83 Age (days) Mix CoAmgper(eDsasyivs)e StCreonmgptrhes(sMivPeaS)trength 77 28 HFC 28 77 28 HRFP-2 28 26.01 27.16 27.52 28.84 28.17 28.87 7 28 HRFP-4 7 28 28.87 2.83 In view of the values obtained, it can be concluded that adding fibres to the mixture, in theInpvrioepworotfiotnhse tveasltueeds, opbrtoadinuecdes, iat csalinghbte icnocnrcelausdeeidn tthaet caodmdipnrgesfisbivresstoretnhgethmioxftuthre, cinontchretper.oTphoisrtimonpsrotevsetmede,nptrmodayucbesbaecsaliugshettihnecraedadsietiionntohfefcibormespredssuicvesstthrenpgotrhosoiftythoef tchoencorentcer.eTteh,iosbitmaipnrionvgeammenotremcaoymbpeacbteacanuds,ethtehreefaodrde,itmioonreofrefisbisrteasnrtemduactersiathl.eTphoercoosmity- porfetshseivceosntcrreentget,hobotfatihneintghraeemcorneccreotmespafctteransdev,etnhedreafyosreis,mhigohreretshiasntanthtem1a6t.5erMialP.aTrhee- qcoumirepdrefsosrivtheestCrEenMgtIhIIoufstehdeitnhrthee cmoinxcprertoepsoarfttieorns.even days is higher than the 16.5 MPa requiTroedanfoarlythse tChEeMtenIIsIiluessetdreingtthhe, mthiex vparloupeosrotibotna.ined at 28 days will be taken into ac- count. The tensile strength of all the fibre-reinforced concretes was higher than the control value. In the case of the HRFP-2, the tensile strength increased by 6.28%, while for the HRFP-4 the increase was 36.71%. It can be concluded that there is a correlation between a greater volume of fibres and an increase in tensile strength. In relation to the tensile strength of the cylinders, a change in the failure mode can be Absorption (% vol.) Porosity (% vol.) seen when the polyethylene fibres are added. Although the control specimens broke ab-PDF Image | Recycled Polyethylene Fibres for Structural Concrete
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