Captura de CO2 em argamassas de revestimento através da carbonatação
The cement industry generates around 7% of global anthropogenic co2 emissions. In order to reduce its emissions, this sector aims to improve energy efficiency, reduce clinker content in cement and implement carbon capture and storage techniques. The co2 uptake in cementitious materials, such as mort...
| Autor principal: | Mazurana, Lissandra |
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| Formato: | Dissertação |
| Idioma: | Português |
| Publicado em: |
Universidade Tecnológica Federal do Paraná
2020
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| Assuntos: | |
| Acesso em linha: |
http://repositorio.utfpr.edu.br/jspui/handle/1/4733 |
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| Resumo: |
The cement industry generates around 7% of global anthropogenic co2 emissions. In order to reduce its emissions, this sector aims to improve energy efficiency, reduce clinker content in cement and implement carbon capture and storage techniques. The co2 uptake in cementitious materials, such as mortars and concretes, occurs due to the chemical reaction of carbonation, during its service life or after the building/structure demolition /. In this sense, this study aims to evaluate the co2 uptake potential due to carbonation in rendering mortars produced with recycled aggregates of cdw (construction and demolition waste), without coating. Mortars with and without hydrated lime were produced, with replacement of natural sand by cdw recycled sand, at levels of 0, 25, 50, 75 and 100%, evaluating the main properties in the fresh and hardened state. The mortars were naturally carbonated in indoor environment, and outdoor environment protected and unprotected to the rain, until the age of 266 days. For the emission balance, calculations were made of the amount of co2 uptake by means of the carbonation depth and the amount of co2 emitted in the mortars production. Co2 utapke was also evaluated by thermal analysis (tga / dtg).The results indicate that incorporation of cdw in rendering mortars besides contributing to the recycling of these materials and reduction of environmental problems also increases the potential and capture of co2. For mortars with 100% cdw there was an increase of about 7 mm in the carbonation depth and 2.30 times in the co2 uptake (69.95 kgco2/m³). Mortars have a great co2 capture potential at exposure time, such as cement mortar with 75% and 100% rcd, reaching the highest purity of carbonation at 266 days and capture was 165.34 kgco2/m3. The co2 uptake through natural carbonation of rendering mortar can be regarded as a compensatory measure in the building life cycle, since the mortars have the capacity to absorb up to 53,8% of co2 emitted in its production. |
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