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Evaluation of Eco-Efficient Concretes Produced with Fly Ash and Uncarbonated Recycled Aggregates
| Content Provider | MDPI |
|---|---|
| Author | Etxeberria, Miren |
| Copyright Year | 2021 |
| Description | The fabrication of conventional concrete, as well as remains from demolition, has a high environmental impact. This paper assessed the eco-efficiency of concrete made with uncarbonated recycled concrete aggregates (RCA) and fly ash (FA). Two concrete series were produced with an effective water/cement ratio of 0.50 (Series 1) and 0.40 (Series 2). In both series, concretes were produced using 0% and 50% of RCA with 0%, 25% and 50% FA. After analysing the compressive strength, and carbonation and chloride resistance of those concretes, their eco-efficiency based on the binder intensity and $CO_{2}$-eq intensity was assessed. We found that the use of 50% uncarbonated RCA improved the properties of concretes produced with FA with respect to using natural aggregates. The concrete made of 25% FA plus RCA was considered the most eco-efficient based on the tests of compressive, carbonation and chloride properties with the values of 4.1 kg $CO_{2}$ $m^{−3}$ $MPa^{−1}$, 76.3 kg $CO_{2}$ $m^{−3}$ $mm^{−1}$ $year^{0.5}$ and 0.079 kg $CO_{2}$ $m^{−3}$ $C^{−1}$, respectively. The uncarbonated RCA improved carbonation resistance, and FA improved chloride resistance. It can be concluded that the use of 50% un-carbonated RCA combined with FA considerably enhanced the properties of hardened concrete and their eco-efficiency with respect to concretes produced with natural aggregates. |
| Starting Page | 7499 |
| e-ISSN | 19961944 |
| DOI | 10.3390/ma14247499 |
| Journal | Materials |
| Issue Number | 24 |
| Volume Number | 14 |
| Language | English |
| Publisher | MDPI |
| Publisher Date | 2021-12-07 |
| Access Restriction | Open |
| Subject Keyword | Materials Eco-efficiency Recycled Aggregate Concrete Fly Ash Mechanical Properties Carbonation Chloride Resistance Durability Sustainable Construction |
| Content Type | Text |
| Resource Type | Article |
