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    Mechanical performance of eco-friendly concretes with volcanic powder and recycled concrete aggregates

    Autor: 
    Letelier, Viviana
    ;
    Marcos Ortega, José
    ;
    Tarela, Ester
    ;
    Muñoz, Pedro (1)
    ;
    Henríquez-Jara, Bastián I.
    ;
    Moriconi, Giacomo
    Fecha: 
    09/2018
    Palabra clave: 
    volcanic powder; recycled aggregates; eco-friendly concrete; sustainability; mechanical performance; Young's modulus; JCR; Scopus
    Tipo de Ítem: 
    Articulo Revista Indexada
    URI: 
    https://reunir.unir.net/handle/123456789/7694
    DOI: 
    http://dx.doi.org/10.3390/su10093036
    Dirección web: 
    https://www.mdpi.com/2071-1050/10/9/3036
    Open Access
    Resumen:
    At present, reducing the environmental impact of the construction industry is a major subject of study. In terms of the use of recycled concrete aggregates (RCA), most recently conducted studies have shown that the use of a limited percentage of those aggregates does not significantly affect the properties of concretes. This work analysed the mechanical properties of medium-strength concretes with a high contribution to sustainability, where cement and natural coarse aggregates (NCA) were partially replaced by volcanic powder (VP) and RCA, respectively. Three mixing ratios of VP replacement were tested in concretes without RCA and concretes with 30% RCA replacing NCA. Results show that when VP is used without RCA, up to 10% of the cement can be replaced by VP without a significant loss in the mechanical properties. When a combination of 5% VP and 30% RCA is used, the weakness of the recycled concrete is strengthened, obtaining stronger concretes than a control concrete with no recycled materials. Finally, the greenhouse gas assessment showed that the simultaneous incorporation of VP and RCA reduces CO2 emissions produced in the manufacture of concrete by up to 13.6%.
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