Behaviour and Properties of Eco-Cement Pastes Elaborated with Recycled Concrete Powder from Construction and Demolition Wastes
This work analyses the influence of fine concrete fractions (<5 mm) of different natures —calcareous (HcG) and siliceous (HsT)—obtained from construction and demolition waste (C&DW) on the behaviour of blended cement pastes with partial replacements between 5 and 10%. The two C&DW fractio...
| Main Authors: | , , , , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
MDPI AG
2021-03-01
|
| Series: | Materials |
| Subjects: | |
| Online Access: | https://www.mdpi.com/1996-1944/14/5/1299 |
| _version_ | 1797542111266996224 |
|---|---|
| author | Laura Caneda-Martínez Manuel Monasterio Jaime Moreno-Juez Sagrario Martínez-Ramírez Rosario García Moisés Frías |
| author_facet | Laura Caneda-Martínez Manuel Monasterio Jaime Moreno-Juez Sagrario Martínez-Ramírez Rosario García Moisés Frías |
| author_sort | Laura Caneda-Martínez |
| collection | DOAJ |
| description | This work analyses the influence of fine concrete fractions (<5 mm) of different natures —calcareous (HcG) and siliceous (HsT)—obtained from construction and demolition waste (C&DW) on the behaviour of blended cement pastes with partial replacements between 5 and 10%. The two C&DW fractions were characterised by different instrumental techniques. Subsequently, their lime-fixing capacity and the physico-mechanical properties of the blended cement pastes were analysed. Lastly, the environmental benefits of reusing these fine wastes in the manufacture of future eco-efficient cement pastes were examined. The results show that HsT and HcG exhibit weak pozzolanic activity, owing to their low reactive silica and alumina content. Despite this, the new cement pastes meet the physical and mechanical requirements of the existing regulations for common cements. It should be highlighted that the blended cement pastes initially showed a coarser pore network, but then they underwent a refinement process between 2 and 28 days, along with a gain in compressive strength, possibly due to the double pozzolanic and filler effect of the wastes. The environmental viability of the blended cements was evaluated in a Life Cycle Assessment (LCA) concluding that the overall environmental impact could be reduced in the same proportion of the replacement rate. This is in line with the Circular Economy goals and the 2030 Agenda for Sustainable Development. |
| first_indexed | 2024-03-10T13:26:02Z |
| format | Article |
| id | doaj.art-527d716124e849d18a0d4bbac09da75b |
| institution | Directory Open Access Journal |
| issn | 1996-1944 |
| language | English |
| last_indexed | 2024-03-10T13:26:02Z |
| publishDate | 2021-03-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Materials |
| spelling | doaj.art-527d716124e849d18a0d4bbac09da75b2023-11-21T09:38:14ZengMDPI AGMaterials1996-19442021-03-01145129910.3390/ma14051299Behaviour and Properties of Eco-Cement Pastes Elaborated with Recycled Concrete Powder from Construction and Demolition WastesLaura Caneda-Martínez0Manuel Monasterio1Jaime Moreno-Juez2Sagrario Martínez-Ramírez3Rosario García4Moisés Frías5Eduardo Torroja Institute for Construction Sciences (IETcc-CSIC), 28033 Madrid, SpainEduardo Torroja Institute for Construction Sciences (IETcc-CSIC), 28033 Madrid, SpainTecnalia, Basque Research and Technology Alliance (BRTA), Astondo Bidea, Edificio 700, Parque Tecnológico de Bizkaia, 48160 Derio, SpainInstitute for the Structure of Matter (IEM-CSIC), 28006 Madrid, SpainDepartamento de Geología y Geoquímica, Geomateriales Unidad Asociada CSIC-UAM, Universidad Autónoma de Madrid, 28049 Madrid, SpainEduardo Torroja Institute for Construction Sciences (IETcc-CSIC), 28033 Madrid, SpainThis work analyses the influence of fine concrete fractions (<5 mm) of different natures —calcareous (HcG) and siliceous (HsT)—obtained from construction and demolition waste (C&DW) on the behaviour of blended cement pastes with partial replacements between 5 and 10%. The two C&DW fractions were characterised by different instrumental techniques. Subsequently, their lime-fixing capacity and the physico-mechanical properties of the blended cement pastes were analysed. Lastly, the environmental benefits of reusing these fine wastes in the manufacture of future eco-efficient cement pastes were examined. The results show that HsT and HcG exhibit weak pozzolanic activity, owing to their low reactive silica and alumina content. Despite this, the new cement pastes meet the physical and mechanical requirements of the existing regulations for common cements. It should be highlighted that the blended cement pastes initially showed a coarser pore network, but then they underwent a refinement process between 2 and 28 days, along with a gain in compressive strength, possibly due to the double pozzolanic and filler effect of the wastes. The environmental viability of the blended cements was evaluated in a Life Cycle Assessment (LCA) concluding that the overall environmental impact could be reduced in the same proportion of the replacement rate. This is in line with the Circular Economy goals and the 2030 Agenda for Sustainable Development.https://www.mdpi.com/1996-1944/14/5/1299construction and demolition wastesupplementary cementitious materialscircular economyeco-efficient cements |
| spellingShingle | Laura Caneda-Martínez Manuel Monasterio Jaime Moreno-Juez Sagrario Martínez-Ramírez Rosario García Moisés Frías Behaviour and Properties of Eco-Cement Pastes Elaborated with Recycled Concrete Powder from Construction and Demolition Wastes Materials construction and demolition waste supplementary cementitious materials circular economy eco-efficient cements |
| title | Behaviour and Properties of Eco-Cement Pastes Elaborated with Recycled Concrete Powder from Construction and Demolition Wastes |
| title_full | Behaviour and Properties of Eco-Cement Pastes Elaborated with Recycled Concrete Powder from Construction and Demolition Wastes |
| title_fullStr | Behaviour and Properties of Eco-Cement Pastes Elaborated with Recycled Concrete Powder from Construction and Demolition Wastes |
| title_full_unstemmed | Behaviour and Properties of Eco-Cement Pastes Elaborated with Recycled Concrete Powder from Construction and Demolition Wastes |
| title_short | Behaviour and Properties of Eco-Cement Pastes Elaborated with Recycled Concrete Powder from Construction and Demolition Wastes |
| title_sort | behaviour and properties of eco cement pastes elaborated with recycled concrete powder from construction and demolition wastes |
| topic | construction and demolition waste supplementary cementitious materials circular economy eco-efficient cements |
| url | https://www.mdpi.com/1996-1944/14/5/1299 |
| work_keys_str_mv | AT lauracanedamartinez behaviourandpropertiesofecocementpasteselaboratedwithrecycledconcretepowderfromconstructionanddemolitionwastes AT manuelmonasterio behaviourandpropertiesofecocementpasteselaboratedwithrecycledconcretepowderfromconstructionanddemolitionwastes AT jaimemorenojuez behaviourandpropertiesofecocementpasteselaboratedwithrecycledconcretepowderfromconstructionanddemolitionwastes AT sagrariomartinezramirez behaviourandpropertiesofecocementpasteselaboratedwithrecycledconcretepowderfromconstructionanddemolitionwastes AT rosariogarcia behaviourandpropertiesofecocementpasteselaboratedwithrecycledconcretepowderfromconstructionanddemolitionwastes AT moisesfrias behaviourandpropertiesofecocementpasteselaboratedwithrecycledconcretepowderfromconstructionanddemolitionwastes |