Relationship between the mechanical properties and carbonation of concretes with construction and demolition waste
The use of construction and demolition waste in the construction industry has been a constant issue for several years due to the amount of waste generated as well as the need to reduce the consumption of natural aggregates. This study has the aim of optimizing recycled aggregate from construction an...
| Main Authors: | , , , , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
Elsevier
2022-06-01
|
| Series: | Case Studies in Construction Materials |
| Subjects: | |
| Online Access: | http://www.sciencedirect.com/science/article/pii/S2214509521003752 |
| _version_ | 1811250760185282560 |
|---|---|
| author | Sérgio Roberto da Silva Felipe Nunes Cimadon Pietra Moraes Borges Jessica Zamboni Schiavon Edna Possan Jairo José de Oliveira Andrade |
| author_facet | Sérgio Roberto da Silva Felipe Nunes Cimadon Pietra Moraes Borges Jessica Zamboni Schiavon Edna Possan Jairo José de Oliveira Andrade |
| author_sort | Sérgio Roberto da Silva |
| collection | DOAJ |
| description | The use of construction and demolition waste in the construction industry has been a constant issue for several years due to the amount of waste generated as well as the need to reduce the consumption of natural aggregates. This study has the aim of optimizing recycled aggregate from construction and demolition to verify its influence on the elastic modulus in structural concrete. For this, the substitution of coarse natural aggregate by coarse recycled aggregate was evaluated at replacement percentages of 0%, 25%, 50%, 75%, and 100% for concrete with different water/cement ratios (0.40, 0.50, and 0.60). With these criteria, macrostructural tests (compressive strength, splitting strength, porosity and water absorption), microstructural tests (scanning electron microscopy and X-ray microtomography), and accelerated carbonation were employed. The results showed that the mechanical and durability properties in relation to CO2 diffusion decreased as the substitution content of natural aggregate for recycled aggregate increased. The lower the a/c ratio, the denser the concrete and, consequently, the concrete properties are improved. Results showed that there are correlations between the mechanical properties and the carbonation of concrete with recycled aggregate. Through the proposed equations, it is possible to estimate elastic modulus from a given compressive strength at 28 days and with a w/c ratio ranging from 0.4 to 0.6. Based on the compressive strength and w/c ratio, it is possible to estimate the amount of substitution of natural aggregate needed in concretes for an expected elastic modulus. |
| first_indexed | 2024-04-12T16:09:27Z |
| format | Article |
| id | doaj.art-edc62fc26a784407a9377ae228009a0d |
| institution | Directory Open Access Journal |
| issn | 2214-5095 |
| language | English |
| last_indexed | 2024-04-12T16:09:27Z |
| publishDate | 2022-06-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Case Studies in Construction Materials |
| spelling | doaj.art-edc62fc26a784407a9377ae228009a0d2022-12-22T03:25:57ZengElsevierCase Studies in Construction Materials2214-50952022-06-0116e00860Relationship between the mechanical properties and carbonation of concretes with construction and demolition wasteSérgio Roberto da Silva0Felipe Nunes Cimadon1Pietra Moraes Borges2Jessica Zamboni Schiavon3Edna Possan4Jairo José de Oliveira Andrade5Graduate Program of Materials Engineering and Technology, Pontifical Catholic University of Rio Grande do Sul (PGETEMA/PUCRS), BrazilCivil engineering, Pontifical Catholic University of Rio Grande do Sul (PUCRS), BrazilGraduate Program of Materials Engineering and Technology, Pontifical Catholic University of Rio Grande do Sul (PGETEMA/PUCRS), BrazilGraduate Program of Materials Engineering and Technology, Pontifical Catholic University of Rio Grande do Sul (PGETEMA/PUCRS), BrazilEngineering Department, Federal University of Latin American Integration (UNILA), BrazilGraduate Program of Materials Engineering and Technology, Pontifical Catholic University of Rio Grande do Sul (PGETEMA/PUCRS), Brazil; Correspondence to: PUCRS, Av. Ipiranga, 6681, Building 30/D Office 228., Porto Alegre, RS, Brazil.The use of construction and demolition waste in the construction industry has been a constant issue for several years due to the amount of waste generated as well as the need to reduce the consumption of natural aggregates. This study has the aim of optimizing recycled aggregate from construction and demolition to verify its influence on the elastic modulus in structural concrete. For this, the substitution of coarse natural aggregate by coarse recycled aggregate was evaluated at replacement percentages of 0%, 25%, 50%, 75%, and 100% for concrete with different water/cement ratios (0.40, 0.50, and 0.60). With these criteria, macrostructural tests (compressive strength, splitting strength, porosity and water absorption), microstructural tests (scanning electron microscopy and X-ray microtomography), and accelerated carbonation were employed. The results showed that the mechanical and durability properties in relation to CO2 diffusion decreased as the substitution content of natural aggregate for recycled aggregate increased. The lower the a/c ratio, the denser the concrete and, consequently, the concrete properties are improved. Results showed that there are correlations between the mechanical properties and the carbonation of concrete with recycled aggregate. Through the proposed equations, it is possible to estimate elastic modulus from a given compressive strength at 28 days and with a w/c ratio ranging from 0.4 to 0.6. Based on the compressive strength and w/c ratio, it is possible to estimate the amount of substitution of natural aggregate needed in concretes for an expected elastic modulus.http://www.sciencedirect.com/science/article/pii/S2214509521003752Construction and demolition wasteCoarse recycled aggregatePhysical-mechanical propertiesMicrostructural analysis |
| spellingShingle | Sérgio Roberto da Silva Felipe Nunes Cimadon Pietra Moraes Borges Jessica Zamboni Schiavon Edna Possan Jairo José de Oliveira Andrade Relationship between the mechanical properties and carbonation of concretes with construction and demolition waste Case Studies in Construction Materials Construction and demolition waste Coarse recycled aggregate Physical-mechanical properties Microstructural analysis |
| title | Relationship between the mechanical properties and carbonation of concretes with construction and demolition waste |
| title_full | Relationship between the mechanical properties and carbonation of concretes with construction and demolition waste |
| title_fullStr | Relationship between the mechanical properties and carbonation of concretes with construction and demolition waste |
| title_full_unstemmed | Relationship between the mechanical properties and carbonation of concretes with construction and demolition waste |
| title_short | Relationship between the mechanical properties and carbonation of concretes with construction and demolition waste |
| title_sort | relationship between the mechanical properties and carbonation of concretes with construction and demolition waste |
| topic | Construction and demolition waste Coarse recycled aggregate Physical-mechanical properties Microstructural analysis |
| url | http://www.sciencedirect.com/science/article/pii/S2214509521003752 |
| work_keys_str_mv | AT sergiorobertodasilva relationshipbetweenthemechanicalpropertiesandcarbonationofconcreteswithconstructionanddemolitionwaste AT felipenunescimadon relationshipbetweenthemechanicalpropertiesandcarbonationofconcreteswithconstructionanddemolitionwaste AT pietramoraesborges relationshipbetweenthemechanicalpropertiesandcarbonationofconcreteswithconstructionanddemolitionwaste AT jessicazambonischiavon relationshipbetweenthemechanicalpropertiesandcarbonationofconcreteswithconstructionanddemolitionwaste AT ednapossan relationshipbetweenthemechanicalpropertiesandcarbonationofconcreteswithconstructionanddemolitionwaste AT jairojosedeoliveiraandrade relationshipbetweenthemechanicalpropertiesandcarbonationofconcreteswithconstructionanddemolitionwaste |