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Appl. Sci. 2022, 12, 2867 15 of 20 To analyse the tensile strength, the values obtained at 28 days will be taken into account. 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 seen when the polyethylene fibres are added. Although the control specimens broke abruptly, typical of a brittle fracture in concrete, the specimens with fibres showed a smooth fracture, maintaining the original shape of the fibre. As can be seen in Figure 15, the fibres are responsible for holding the specimen in its position once the cracking occurs. It can be Appl. Sci. 2022, 12, x FOR PEER REVIEW 16 of 21 concluded that the incorporation of fibres decreases the brittle fracture of the concrete and also helps to control the cracks. FiFgiugruer1e51.5B. rBeraekaiknigngsusrufarfcaecoefoaf cayclyinlidnrdicraiclaslpsepceicmimenenafateftrear atetnesnisleilespslpitltiitntigngstsrternegntghthtetsets.t. Figure 16a,b shows a cut specimen, where the distribution of the fibres in the concrete Figure 16a,b shows a cut specimen, where the distribution of the fibres in the concrete can be seen; although the amount of fibres used is not very high, it can be seen that they can be seen; although the amount of fibres used is not very high, it can be seen that they are distributed randomly over the entire surface. This indicates that the polyethylene fibres are distributed randomly over the entire surface. This indicates that the polyethylene fi- mix easily with the concrete, without producing balls or hedgehogs. Furthermore, a good bres mix easily with the concrete, without producing balls or hedgehogs. Furthermore, a adhesion of the fibres can be seen, due to the roughness of the fibres, and other factors. It good adhesion of the fibres can be seen, due to the roughness of the fibres, and other fac- must also be taken into account that the direction of the fibres is random, which plays a tors. It must also be taken into account that the direction of the fibres is random, which fundamental role in the tensile strength of the concrete, as the fibres in the longitudinal plays a fundamental role in the tensile strength of the concrete, as the fibres in the longi- axis to the specimen will not provide any reinforcement. Several authors have shown tudinal axis to the specimen will not provide any reinforcement. Several authors have that the orientation and distribution of fibres play an important role in mechanical prop- shown that the orientation and distribution of fibres play an important role in mechanical erties [68–71]. As an example, Figure 16c shows an example of the cylindrical specimen’s properties [68–71]. As an example, Figure 16c shows an example of the cylindrical speci- fibre distribution. men’s fibre distribution.PDF Image | Recycled Polyethylene Fibres for Structural Concrete
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