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Examinando por Autor "Saiz Martinez , Pablo"

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    Characterization of Three Types of Recycled Aggregates from Different Construction and DemolitionWaste: An Experimental Study forWaste Management
    (MDPI, 2023-02-19) Saiz Martinez , Pablo; Ferrández Vega, Daniel; Melane Lavado, Alberto; Zaragoza Benzal, Alicia
    Achieving sustainable management and efficient use of natural resources stands out as one of the goals included in the Goals for Sustainable Development in the 2030 Agenda. The construction sector is currently far from presenting an efficient model in terms of treating waste generated by it. Variations in the physical and chemical properties of recycled aggregates coming from construction and demolition waste are one of the main reasons of their limited use in the production of construction materials. This research presents a physicochemical characterization of three different types of recycled aggregates coming from different types of waste: concrete, ceramic and mixed. Physical characterization shows that recycled concrete aggregate has better physical properties compared with mixed recycled aggregate and ceramic recycled aggregate, which makes it more suitable for use in masonry mortars and concrete, due to its higher dry density (2210.33 kg/m3), its lower content of fines (5.17%), its lower friability coefficient (24.60%), and its water absorption coefficient (6.70%). Chemical characterization shows that none of the tested recycled aggregates contains traces of harmful chemical agents that exceed the limits established by the reference regulations. Finally, the statistical analysis shows good homogeneity for these raw materials, obtaining low coefficients of variation and values within the recommended in each of the calculated confidence intervals.
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    New test methods to determine water absorption by capillarity. Experimental study in masonry mortars
    (Elsevier, 2022-02-22) Saiz Martinez , Pablo; Ferrández Vega , Daniel; Morón Fernández, Carlos; Yedra, Engerst
    In this work, two alternative methods are presented to evaluate the absorption of water by capillarity in masonry mortars. For this, two different types of sensors of our design have been developed, one capacitive and the other resistive. The measuring equipment has been tested in mortar samples made with three kinds of aggregates: natural, recycled ceramic, and recycled concrete. The results obtained employing the capacitive sensor show how there is a good correlation between the mass of water absorbed by the mortars and the variation in capacitance, taking into account that mortars made with recycled ceramic aggregate were the ones that present a higher capillary absorption coefficient and lower mechanical resistance. On the other hand, with the help of the resistive sensor, it has been possible to monitor in real-time the rise of water by capillarity inside the samples, determining how the percentage of humidity measured at different heights of the samples evolves. As a result, it has been observed that water experiences a greater rise due to capillarity in mortars made with natural aggregate.
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    Towards a more sustainable environmentally production system for the treatment of recycled aggregates in the construction industry: An experimental study
    (Elsevier, 2023-06-01) Saiz Martinez , Pablo; Ferrández Vega, Daniel; Zaragonza Benzal, Alicia; Zúñiga Vicente, Jose Angel
    The reuse and recycling of construction and demolition waste is becoming an advisable choice to reduce the consumption of key raw materials and the environmental impact generated by the construction of new buildings. This study proposes the introduction of two new stages of recycled aggregate processing that allow redesigning the production process of recycled aggregates towards a more sustainable and eco-friendly system: sieving with secondary crushing and washing. Based on an experimental study, our findings show that the new stages reduce significantly the content of impurities and the water absorption of recycled aggregates, obtaining a better final product (i.e. cement mortar) for buildings. Moreover, the new final product made with treated recycled aggregates also experiences significant improvements in their physical and mechanical properties (i.e.: increased on average, 5% in flexural strength, 6% in compression strength and reduced shrinkage by 2%), in turn reducing both the costs associated with the manufacture of the new product and its environmental impact compared to other products that solely include untreated recycled aggregates. The potential economic and solid waste management implications for firms that choose to deploy the new production system depicted are also discussed.

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