Microstructural characterization in HEC and EVA modified cement pastes
HEC and EVA polymers are currently used in Brazil for the production of dry-set mortars, which are used for the fitting of ceramic tiles. Despite the widespread application in construction sites, the knowledge about physical or chemical interactions between the polymers, cement and aggregates is poo...
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ANTAC - Associação Nacional de Tecnologia do Ambiente Construído
2008
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ojs-article-34162008-04-14T17:27:37Z Microstructural characterization in HEC and EVA modified cement pastes Caracterização microestrutural de pastas de cimento aditivadas com polímeros HEC e EVA Silva, Denise Antunes da Roman, Humberto Ramos Argamassa colante; olímero; HEC; EVA; Microestrutura de pasta de cimento HEC and EVA polymers are currently used in Brazil for the production of dry-set mortars, which are used for the fitting of ceramic tiles. Despite the widespread application in construction sites, the knowledge about physical or chemical interactions between the polymers, cement and aggregates is poor. The purpose of this paper is to present the results obtained in microstructure characterization tests on HEC and/or EVA modified pastes. Current techniques for characterization of materials were applied, such as differential and gravimetric thermal analysis, X-ray diffraction, Fourier transformed - infrared spectroscopy, and scanning electron microscopy. The effects of polymer type and content, cement hydration time and curing method were evaluated. The results have shown that EVA is the most important factor affecting the microstructure of cement pastes, regardless of the hydration time and curing method, since it physically and chemically interacts with cement, giving rise to the formation of new phases. HEC polymer reduces the effects of EVA polymer, suggesting that some interaction between both polymers can occur in the paste’s aqueous phase. Os polímeros HEC e EVA são empregados pela indústria nacional na produção de argamassas colantes destinadas ao assentamento de revestimentos cerâmicos. Apesar da larga utilização dessas argamassas nos canteiros de obras, as formas de interação dos polímeros com cimento e agregados são pouco conhecidas. Buscando ampliar as bases do conhecimento, desenvolveu-se uma pesquisa para caracterização de pastas de cimento Portland aditivadas com os polímeros HEC e EVA. O objetivo do presente trabalho é apresentar e discutir parte dos resultados obtidos. Técnicas usuais de caracterização de materiais, como análise térmica diferencial e termogravimétrica, difratometria de raios-X, espectroscopia de infravermelho e microscopia eletrônica de varredura foram empregadas. Os efeitos do tipo e teor de cada polímero, idade de hidratação do cimento e tipo de cura foram avaliados. Os resultados indicaram que, independentemente da idade e do tipo de cura, o EVA modifica substancialmente a microestrutura das pastas, pois interage química e fisicamente com o cimento. O HEC minimiza os efeitos do EVA, sugerindo que os polímeros interagem na fase aquosa das pastas. ANTAC - Associação Nacional de Tecnologia do Ambiente Construído 2008-04-14 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion application/pdf https://seer.ufrgs.br/ambienteconstruido/article/view/3416 Ambiente Construído; v. 2, n. 2 (2002): Edição Especial Tecnologia das Argamassas; 31-46 Ambiente Construído; v. 2, n. 2 (2002): Edição Especial Tecnologia das Argamassas; 31-46 Ambiente Construído; v. 2, n. 2 (2002): Edição Especial Tecnologia das Argamassas; 31-46 1678-8621 1415-8876 por https://seer.ufrgs.br/ambienteconstruido/article/view/3416/1831 Direitos autorais 2016 Ambiente Construído https://creativecommons.org/licenses/by/4.0 |
| institution |
Universidade Federal do Rio Grande do Sul |
| collection |
OJS |
| language |
por |
| format |
Online |
| author |
Silva, Denise Antunes da Roman, Humberto Ramos |
| spellingShingle |
Silva, Denise Antunes da Roman, Humberto Ramos Microstructural characterization in HEC and EVA modified cement pastes |
| author_facet |
Silva, Denise Antunes da Roman, Humberto Ramos |
| author_sort |
Silva, Denise Antunes da |
| title |
Microstructural characterization in HEC and EVA modified cement pastes |
| title_short |
Microstructural characterization in HEC and EVA modified cement pastes |
| title_full |
Microstructural characterization in HEC and EVA modified cement pastes |
| title_fullStr |
Microstructural characterization in HEC and EVA modified cement pastes |
| title_full_unstemmed |
Microstructural characterization in HEC and EVA modified cement pastes |
| title_sort |
microstructural characterization in hec and eva modified cement pastes |
| description |
HEC and EVA polymers are currently used in Brazil for the production of dry-set mortars, which are used for the fitting of ceramic tiles. Despite the widespread application in construction sites, the knowledge about physical or chemical interactions between the polymers, cement and aggregates is poor. The purpose of this paper is to present the results obtained in microstructure characterization tests on HEC and/or EVA modified pastes. Current techniques for characterization of materials were applied, such as differential and gravimetric thermal analysis, X-ray diffraction, Fourier transformed - infrared spectroscopy, and scanning electron microscopy. The effects of polymer type and content, cement hydration time and curing method were evaluated. The results have shown that EVA is the most important factor affecting the microstructure of cement pastes, regardless of the hydration time and curing method, since it physically and chemically interacts with cement, giving rise to the formation of new phases. HEC polymer reduces the effects of EVA polymer, suggesting that some interaction between both polymers can occur in the paste’s aqueous phase. |
| publisher |
ANTAC - Associação Nacional de Tecnologia do Ambiente Construído |
| publishDate |
2008 |
| url |
https://seer.ufrgs.br/ambienteconstruido/article/view/3416 |
| work_keys_str_mv |
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| _version_ |
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