| Title | Assessment of the Permeability to Aggressive Agents of Concrete with Recycled Cement and Mixed Recycled Aggregate |
|---|---|
| ID_Doc | 19967 |
| Authors | Cantero, B; Bravo, M; de Brito, J; del Bosque, IFS; Medina, C |
| Title | Assessment of the Permeability to Aggressive Agents of Concrete with Recycled Cement and Mixed Recycled Aggregate |
| Year | 2021 |
| Published | Applied Sciences-Basel, 11.0, 9 |
| Abstract | Acceptance by the construction industry of recycled concrete as a sustainable alternative material is contingent upon a reliable assessment of its permeability to corrosive agents. This study analyses the transport mechanisms associated with chloride (Cl-), oxygen (O-2) and carbon dioxide (CO2) ions in concrete with cement made with 10% or 25% ground recycled concrete (GRC) separately or in combination with 50% mixed recycled aggregate (MRA). The findings show that, irrespective of aggregate type, concrete with GRC exhibited lower resistance to ingress than conventional concrete due to its greater porosity. Nonetheless, O-2 permeability was consistently below 4.5 x 10(-17) m(2) and CO2 penetration, under 4 mm/year(0.5), indicative of concrete with high quality. Resistance to CO2 and Cl- penetration in the materials with 10% GRC was similar to the values observed in conventional concrete. On the other hand, the incorporation of 25% GRC increased the penetration of CO2 and Cl- by 106% and 38%, respectively. Further to those findings in normal carbonation environments, reinforcement passivity would be guaranteed in such recycled materials over a 100 year service life. |
| https://www.mdpi.com/2076-3417/11/9/3856/pdf?version=1619258511 |
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