Browsing by Author "Fuente Navarro, Christopher Alfredo de la"

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    Reduction of the Curing Time and Self-healing of Cold Asphalt Mixtures by Means Magnetic Induction
    (Springer Cham, 2025) Fuente Navarro, Christopher Alfredo de la; Lastra-González, Pedro; Indacoechea-Vega, Irune; Castro-Fresno, Daniel
    This research evaluates the feasibility of using magnetic induction to reduce the curing time and for the self-healing of cold asphalt mixtures. For this purpose, the traditional oven curing method was compared with two novel magnetic induction protocols for fast curing in terms of water evaporated, time and energy used; the resulting mixtures were evaluated mechanically. Then, by means of a rupture-healing-rupture test, the feasibility of healing the cold asphalt mixtures by magnetic induction was determined. In addition, the impact of healing by magnetic induction on the service life of the mixtures in the face of particle loss was evaluated. With the developments of this research, it is possible to conclude that fast curing by magnetic induction is a feasible option, which improves the resistance to particle loss but decreases its stiffness and indirect tensile strength of the samples. In addition, it is possible to heal the mixtures by magnetic induction, having an optimum healing temperature, which allows the increase of durability against particle loss.
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    Reinforcement of porous asphalt mixtures with recycled fibers from industrial processes
    (2025) Miera-Domínguez, Helena; Fuente Navarro, Christopher Alfredo de la; Lastra-González, Pedro; Indacoechea-Vega, Irune; Castro-Fresno, Daniel
    To date, most studies on asphalt mixtures reinforced with virgin fibers have shown promising results. In this regard, to make progress in this area, this work proposes the use of recycled fibres from industrial processes. The aim of this study is to evaluate the feasibility of improving the mechanical performance of porous asphalt mixtures by using recycled fibers as an alternative to polymer-modified bitumen (PMB). To this end, the study has been divided into three stages, the first of which involved the mechanical evaluation of mixtures reinforced with three different recycled fibers and selecting the best one using a multi-criteria analysis. In the second stage, considering the ability to increase the useful percentage of binder, performance has been optimised by testing different percentages of bitumen. Finally, the last step focused on optimising the mixture. For this step, various mechanical tests have been carried out: particle loss, water sensitivity, drainage, stiffness and fatigue, as well as a specific fuel resistance test and ravelling resistance by means of the steel brush test. According to the results, the recycled fibers called ECOFIBER showed the best results, although they significantly improved the mechanical behaviour of conventional bitumen mixtures, they did not match the performance of polymer modified bitumen mixtures. Specifically, the use of this type of ecofibers in the experimental mixture with conventional binder not modified with polymers, improves the abrasion resistance in the brush test and particle loss due to fuel resistance, reaching a performance comparable to that of the control mixture with polymer modified binder without the addition of fibers. However, in tests such as cantabro, water sensitivity, fatigue and modulus, the experimental mixture with fibers showed an improvement over the reference mixture, but did not match the performance of the control mixture with polymer modified asphalt binder.
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    Rheological properties of a novel cold asphalt mastic with fast curing by means of magnetic induction
    (2024) Lagos-Varas, Manuel; Fuente Navarro, Christopher Alfredo de la; Lastra-González, Pedro; Xiao, Feipeng; Castro-Fresno, Daniel
    Curing time required by cold asphalt mixtures is quite long, what has induced researchers to develop a fast-curing method utilising magnetic induction. In this regard, this research evaluated the rheological consequences of the novel procedure on the mastic by comparison of two reference mastics: one cured following the U.S. Asphalt institute guidelines and another at room temperature for 7 days. In addition, a mastic made with a conventional polymer-modified binder (PMB) was considered as a control mastic. Rheological evaluation of the mastics was performed using the dynamic shear rheometer (DSR), multiple stress creep recovery (MSCR), dynamic shear rheometer-elastic recovery (DSR-ER), linear amplitude sweep (LAS) and binder yield energy (BYE). Burgers' mathematical model was used to develop the DSR-ER and MSCR results. It was found that the PMB mastic had the best performance in all tests. Whereas, all mastics made with asphalt emulsion, irrespective of the curing process, indicated low performance in terms of plastic deformation. Specifically, in terms of stiffness, accelerated curing by magnetic induction was more representative of what happened in real conditions, as oven curing leaded to premature ageing.