Geopolymer Recycled Aggregate Concrete: From Experiments to Empirical Models
Ordinary cement concrete is a popular material with numerous advantages when compared to other construction materials; however, ordinary concrete is also criticized from the public point of view due to the CO<sub>2</sub> emission (during the cement manufacture) and the consumption of nat...
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| Format: | Article |
| Language: | English |
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MDPI AG
2021-03-01
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| Series: | Materials |
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| Online Access: | https://www.mdpi.com/1996-1944/14/5/1180 |
| _version_ | 1797415671350427648 |
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| author | Hoai-Bao Le Quoc-Bao Bui Luping Tang |
| author_facet | Hoai-Bao Le Quoc-Bao Bui Luping Tang |
| author_sort | Hoai-Bao Le |
| collection | DOAJ |
| description | Ordinary cement concrete is a popular material with numerous advantages when compared to other construction materials; however, ordinary concrete is also criticized from the public point of view due to the CO<sub>2</sub> emission (during the cement manufacture) and the consumption of natural resources (for the aggregates). In the context of sustainable development and circular economy, the recycling of materials and the use of alternative binders which have less environmental impacts than cement are challenges for the construction sector. This paper presents a study on non-conventional concrete using recycled aggregates and alkali-activated binder. The specimens were prepared from low calcium fly ash (FA, an industrial by-product), sodium silicate solution, sodium hydroxide solution, fine aggregate from river sand, and recycled coarse aggregate. First, influences of different factors were investigated: the ratio between alkaline activated solution (AAS) and FA, and the curing temperature and the lignosulfonate superplasticizer. The interfacial transition zone of geopolymer recycled aggregate concrete (GRAC) was evaluated by microscopic analyses. Then, two empirical models, which are the modified versions of Feret’s and De Larrard’s models, respectively, for cement concretes, were investigated for the prediction of GRAC compressive strength; the parameters of these models were identified. The results showed the positive behaviour of GRAC investigated and the relevancy of the models proposed. |
| first_indexed | 2024-03-09T05:51:53Z |
| format | Article |
| id | doaj.art-0d73fc75c2de41ebbe40c2e5ef7dba63 |
| institution | Directory Open Access Journal |
| issn | 1996-1944 |
| language | English |
| last_indexed | 2024-03-09T05:51:53Z |
| publishDate | 2021-03-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Materials |
| spelling | doaj.art-0d73fc75c2de41ebbe40c2e5ef7dba632023-12-03T12:16:26ZengMDPI AGMaterials1996-19442021-03-01145118010.3390/ma14051180Geopolymer Recycled Aggregate Concrete: From Experiments to Empirical ModelsHoai-Bao Le0Quoc-Bao Bui1Luping Tang2Sustainable Developments in Civil Engineering Research Group, Faculty of Civil Engineering, Ton Duc Thang University, Ho Chi Minh City 700000, VietnamSustainable Developments in Civil Engineering Research Group, Faculty of Civil Engineering, Ton Duc Thang University, Ho Chi Minh City 700000, VietnamDepartment of Architecture and Civil Engineering, Division of Building Technology, Chalmers University of Technology, 41296 Gothenburg, SwedenOrdinary cement concrete is a popular material with numerous advantages when compared to other construction materials; however, ordinary concrete is also criticized from the public point of view due to the CO<sub>2</sub> emission (during the cement manufacture) and the consumption of natural resources (for the aggregates). In the context of sustainable development and circular economy, the recycling of materials and the use of alternative binders which have less environmental impacts than cement are challenges for the construction sector. This paper presents a study on non-conventional concrete using recycled aggregates and alkali-activated binder. The specimens were prepared from low calcium fly ash (FA, an industrial by-product), sodium silicate solution, sodium hydroxide solution, fine aggregate from river sand, and recycled coarse aggregate. First, influences of different factors were investigated: the ratio between alkaline activated solution (AAS) and FA, and the curing temperature and the lignosulfonate superplasticizer. The interfacial transition zone of geopolymer recycled aggregate concrete (GRAC) was evaluated by microscopic analyses. Then, two empirical models, which are the modified versions of Feret’s and De Larrard’s models, respectively, for cement concretes, were investigated for the prediction of GRAC compressive strength; the parameters of these models were identified. The results showed the positive behaviour of GRAC investigated and the relevancy of the models proposed.https://www.mdpi.com/1996-1944/14/5/1180recycled aggregate concrete (RAC)geopolymerfly ashmodified Feret’s modelDe Larrard’s model |
| spellingShingle | Hoai-Bao Le Quoc-Bao Bui Luping Tang Geopolymer Recycled Aggregate Concrete: From Experiments to Empirical Models Materials recycled aggregate concrete (RAC) geopolymer fly ash modified Feret’s model De Larrard’s model |
| title | Geopolymer Recycled Aggregate Concrete: From Experiments to Empirical Models |
| title_full | Geopolymer Recycled Aggregate Concrete: From Experiments to Empirical Models |
| title_fullStr | Geopolymer Recycled Aggregate Concrete: From Experiments to Empirical Models |
| title_full_unstemmed | Geopolymer Recycled Aggregate Concrete: From Experiments to Empirical Models |
| title_short | Geopolymer Recycled Aggregate Concrete: From Experiments to Empirical Models |
| title_sort | geopolymer recycled aggregate concrete from experiments to empirical models |
| topic | recycled aggregate concrete (RAC) geopolymer fly ash modified Feret’s model De Larrard’s model |
| url | https://www.mdpi.com/1996-1944/14/5/1180 |
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