Mortars with CDW Recycled Aggregates Submitted to High Levels of CO<sub>2</sub>
Construction and demolition wastes (CDW) are generated at a large scale and have a diversified potential in the construction sector. The replacement of natural aggregates (NA) with CDW recycled aggregates (RA) in construction materials, such as mortars, has several environmental benefits, such as th...
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MDPI AG
2021
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oai:doaj.org-article:52138eb064b14ca0a49696a4cad7ede12021-11-25T17:58:52ZMortars with CDW Recycled Aggregates Submitted to High Levels of CO<sub>2</sub>10.3390/infrastructures61101592412-3811https://doaj.org/article/52138eb064b14ca0a49696a4cad7ede12021-11-01T00:00:00Zhttps://www.mdpi.com/2412-3811/6/11/159https://doaj.org/toc/2412-3811Construction and demolition wastes (CDW) are generated at a large scale and have a diversified potential in the construction sector. The replacement of natural aggregates (NA) with CDW recycled aggregates (RA) in construction materials, such as mortars, has several environmental benefits, such as the reduction in the natural resources used in these products and simultaneous prevention of waste landfill. Complementarily, CDW have the potential to capture CO<sub>2</sub> since some of their components may carbonate, which also contributes to a decrease in global warming potential. The main objective of this research is to evaluate the influence of the exposure of CDW RA to CO<sub>2</sub> produced in cement factories and its effect on mortars. Several mortars were developed with a volumetric ratio of 1:4 (cement: aggregate), with NA (reference mortar), CDW RA and CDW RA exposed to high levels of CO<sub>2</sub> (CRA). The two types of waste aggregate were incorporated, replacing NA at 50% and 100% (in volume). The mortars with NA and non-carbonated RA and CRA from CDW were analysed, accounting for their performance in the fresh and hardened states in terms of workability, mechanical behaviour and water absorption by capillarity. It was concluded that mortars with CDW (both CRA and non-carbonated RA) generally present a good performance for non-structural purposes, although they suffer a moderate decrease in mechanical performance when NA is replaced with RA. Additionally, small improvements were found in the performance of the aggregates and mortars with CRA subjected to a CO<sub>2</sub> curing for a short period (5 h), while a long carbonation period (5 d) led to a decrease in performance, contrary to the results obtained in the literature that indicate a significant increase in such characteristics. This difference could be because the literature focused on made-in-laboratory CDW aggregates, while, in this research, the wastes came from real demolition activities, and were thus older and more heterogeneous.Ricardo Infante GomesDavid BastosCatarina Brazão FarinhaCinthia Maia PederneirasRosário VeigaJorge de BritoPaulina FariaAntónio Santos SilvaMDPI AGarticleconstruction and demolition wasterendering mortarsustainable mortarcementcarbon capture and storagerecycled aggregateTechnologyTENInfrastructures, Vol 6, Iss 159, p 159 (2021) |
| institution |
DOAJ |
| collection |
DOAJ |
| language |
EN |
| topic |
construction and demolition waste rendering mortar sustainable mortar cement carbon capture and storage recycled aggregate Technology T |
| spellingShingle |
construction and demolition waste rendering mortar sustainable mortar cement carbon capture and storage recycled aggregate Technology T Ricardo Infante Gomes David Bastos Catarina Brazão Farinha Cinthia Maia Pederneiras Rosário Veiga Jorge de Brito Paulina Faria António Santos Silva Mortars with CDW Recycled Aggregates Submitted to High Levels of CO<sub>2</sub> |
| description |
Construction and demolition wastes (CDW) are generated at a large scale and have a diversified potential in the construction sector. The replacement of natural aggregates (NA) with CDW recycled aggregates (RA) in construction materials, such as mortars, has several environmental benefits, such as the reduction in the natural resources used in these products and simultaneous prevention of waste landfill. Complementarily, CDW have the potential to capture CO<sub>2</sub> since some of their components may carbonate, which also contributes to a decrease in global warming potential. The main objective of this research is to evaluate the influence of the exposure of CDW RA to CO<sub>2</sub> produced in cement factories and its effect on mortars. Several mortars were developed with a volumetric ratio of 1:4 (cement: aggregate), with NA (reference mortar), CDW RA and CDW RA exposed to high levels of CO<sub>2</sub> (CRA). The two types of waste aggregate were incorporated, replacing NA at 50% and 100% (in volume). The mortars with NA and non-carbonated RA and CRA from CDW were analysed, accounting for their performance in the fresh and hardened states in terms of workability, mechanical behaviour and water absorption by capillarity. It was concluded that mortars with CDW (both CRA and non-carbonated RA) generally present a good performance for non-structural purposes, although they suffer a moderate decrease in mechanical performance when NA is replaced with RA. Additionally, small improvements were found in the performance of the aggregates and mortars with CRA subjected to a CO<sub>2</sub> curing for a short period (5 h), while a long carbonation period (5 d) led to a decrease in performance, contrary to the results obtained in the literature that indicate a significant increase in such characteristics. This difference could be because the literature focused on made-in-laboratory CDW aggregates, while, in this research, the wastes came from real demolition activities, and were thus older and more heterogeneous. |
| format |
article |
| author |
Ricardo Infante Gomes David Bastos Catarina Brazão Farinha Cinthia Maia Pederneiras Rosário Veiga Jorge de Brito Paulina Faria António Santos Silva |
| author_facet |
Ricardo Infante Gomes David Bastos Catarina Brazão Farinha Cinthia Maia Pederneiras Rosário Veiga Jorge de Brito Paulina Faria António Santos Silva |
| author_sort |
Ricardo Infante Gomes |
| title |
Mortars with CDW Recycled Aggregates Submitted to High Levels of CO<sub>2</sub> |
| title_short |
Mortars with CDW Recycled Aggregates Submitted to High Levels of CO<sub>2</sub> |
| title_full |
Mortars with CDW Recycled Aggregates Submitted to High Levels of CO<sub>2</sub> |
| title_fullStr |
Mortars with CDW Recycled Aggregates Submitted to High Levels of CO<sub>2</sub> |
| title_full_unstemmed |
Mortars with CDW Recycled Aggregates Submitted to High Levels of CO<sub>2</sub> |
| title_sort |
mortars with cdw recycled aggregates submitted to high levels of co<sub>2</sub> |
| publisher |
MDPI AG |
| publishDate |
2021 |
| url |
https://doaj.org/article/52138eb064b14ca0a49696a4cad7ede1 |
| work_keys_str_mv |
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