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Título: | Properties of concretes bearing mixed recycled aggregate with polymer-modified surfaces |
Autor: | Velardo, Paula; Sáez del Bosque, Isabel Fuencisla; Matías, A.; Sánchez de Rojas, María Isabel CSIC ORCID; Medina, César | Palabras clave: | Mixed recycled aggregates Recycled concretes Polymer Treatment Properties |
Fecha de publicación: | 29-ene-2021 | Editor: | Elsevier | Citación: | Journal of Building Engineering 38: 102211 (2021) | Resumen: | The growing socio-economic interest in conserving the environment constitutes a challenge for businesses with a heavy environmental impact. In the construction industry, the efficient use of recycled construction and demolition waste (CDW) as aggregates in structural concrete and the implications of that practice for a sustainable flow of materials are contributing to the establishment of a circular economy. Mixed recycled aggregates (MRA) account for a substantial fraction of the total. The main hurdle to MRA valorisation is its non-uniformity and certain intrinsic properties that have a direct effect on the performance of recycled concretes. In light of those drawbacks, this study assessed a surface treatment consisting in soaking these mixed materials in polymers to improve their physical and mechanical properties with a view to their use, determining the optimal treatment conditions (concentration, soaking time and drying method). The study also addressed the effect of using the treated MRA to replace 100% of the natural gravel (~40% of the total aggregate) on the fresh state consistency and hardened state compressive and tensile strength and water permeability of the new material. The findings showed that the treatment induced a reduction in mixed recycled aggregate water absorption and a rise in its abrasion resistance. Although treating the MRA as described had no significant effect on concrete mechanical properties, it improved durability significantly. | Versión del editor: | http://dx.doi.org/10.1016/j.jobe.2021.102211 | URI: | http://hdl.handle.net/10261/259476 | DOI: | 10.1016/j.jobe.2021.102211 | Identificadores: | doi: 10.1016/j.jobe.2021.102211 issn: 2352-7102 |
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