Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Durability of concretes bearing construction and demolition waste as cement and coarse aggregate substitutes
Publicado en: Cement and Concrete Composites, Volume 134, November 2022, 104722. https://doi.org/10.1016/j.cemconcomp.2022.104722 ; Concrete combining ground recycled masonry aggregate (GR-RMA) as a partial cement replacement and coarse mixed recycled aggregate (MRA), both sourced from construction and demolition waste (CDW), was analysed for durability. The analysis consisted in indirectly characterising pore system permeability based on key water transport indicators. Concretes were prepared with 25%–50% MRA and/or 25% GR-RMA. The findings showed that, irrespective of the MRA content, in 28 d materials bearing 25% GR-RMA total water absorption was 5.7%–7.1%, porosity 3.5%–5.8%, depth of penetration of water under pressure 3.6%–4.6% and capillary water absorption 3.2%–4.9% lower than in concretes manufactured with conventional cement and MRA. Those values were directly attributable to the lower connectivity of the pore structure in the new concretes, which translated into higher electrical resistivity. All the concretes prepared with both 25% GR-RMA and 25%–50% MRA exhibited depth of water penetration under pressure of <30 cm, total water absorption of <4.2% and sorptivity of <0.4 mm min 0.5, ensuring their impermeability to aggressive external agents. According to a multi-criterion analysis also conducted, optimal mec anical efficiency, durability and environmental impact were attained for materials bearing 25% GR-RMA and 25% MRA. The conclusion drawn from those findings is that the lower quality of MRA than conventional aggregate may be suitably offset by using supplementary cementitious materials (SCMs) in the respective cement in conjunction with such recycled mixed waste to obtain more ecoefficient concretes with properties that ensure their impermeability throughout their service life. ; This paper is an outcome of R&D+I project PID2019-107238RB-C21 funded by the Spanish Ministry of Science and Innovation (MCIN/AEI/10.13039/501100011033) and ERDF-funded project 0008_ECO2CIR_4.E (‘for ...
Durability of concretes bearing construction and demolition waste as cement and coarse aggregate substitutes
Publicado en: Cement and Concrete Composites, Volume 134, November 2022, 104722. https://doi.org/10.1016/j.cemconcomp.2022.104722 ; Concrete combining ground recycled masonry aggregate (GR-RMA) as a partial cement replacement and coarse mixed recycled aggregate (MRA), both sourced from construction and demolition waste (CDW), was analysed for durability. The analysis consisted in indirectly characterising pore system permeability based on key water transport indicators. Concretes were prepared with 25%–50% MRA and/or 25% GR-RMA. The findings showed that, irrespective of the MRA content, in 28 d materials bearing 25% GR-RMA total water absorption was 5.7%–7.1%, porosity 3.5%–5.8%, depth of penetration of water under pressure 3.6%–4.6% and capillary water absorption 3.2%–4.9% lower than in concretes manufactured with conventional cement and MRA. Those values were directly attributable to the lower connectivity of the pore structure in the new concretes, which translated into higher electrical resistivity. All the concretes prepared with both 25% GR-RMA and 25%–50% MRA exhibited depth of water penetration under pressure of <30 cm, total water absorption of <4.2% and sorptivity of <0.4 mm min 0.5, ensuring their impermeability to aggressive external agents. According to a multi-criterion analysis also conducted, optimal mec anical efficiency, durability and environmental impact were attained for materials bearing 25% GR-RMA and 25% MRA. The conclusion drawn from those findings is that the lower quality of MRA than conventional aggregate may be suitably offset by using supplementary cementitious materials (SCMs) in the respective cement in conjunction with such recycled mixed waste to obtain more ecoefficient concretes with properties that ensure their impermeability throughout their service life. ; This paper is an outcome of R&D+I project PID2019-107238RB-C21 funded by the Spanish Ministry of Science and Innovation (MCIN/AEI/10.13039/501100011033) and ERDF-funded project 0008_ECO2CIR_4.E (‘for ...
Durability of concretes bearing construction and demolition waste as cement and coarse aggregate substitutes
Cantero Chaparro, Blas (Autor:in) / Sáez del Bosque, Isabel Fuencisla (Autor:in) / Sánchez de Rojas Gómez, María Isabel (Autor:in) / Matías Sánchez, Agustín (Autor:in) / Medina Martínez, César (Autor:in) / Universidad de Extremadura. Instituto Universitario de Investigación para el Desarrollo Territorial Sostenible (INTERRA) / Universidad de Extremadura. Departamento de Construcción / CSIC. Instituto de Ciencias de la Construcción Eduardo Torroja (IETCC) / UEX-CSIC. Unidad asociada SOSMAT
01.01.2022
Cement and Concrete Composites
Aufsatz (Zeitschrift)
Elektronische Ressource
Englisch
Mixed recycled aggregate , Áridos reciclados mixtos , Supplementary cementitious materials , Materiales cementosos suplementarios , Durability , Durabilidad , Concrete , Hormigón , Electrical resistivity , Resistividad eléctrica , Sorptivity , Sorptividad , 3305.06 Ingeniería Civil , 3312.08 Propiedades de Los Materiales , 3312.12 Ensayo de Materiales
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