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| MONTEIRO,WESLEY F.; MIRANDA,GABRIELA M.; SOARES,RAFAEL R.; SANTOS,CLÁUDIA A.B. DOS; HOFFMANN,MAURÍCIO S.; CARONE,CARLOS L.P.; LIMA,VIVIANE DE; SOUZA,MILTON F. DE; CAMPANI,ADRIANO D.; EINLOFT,SANDRA M.O.; LIMA,JEANE E. DE; LIGABUE,ROSANE A.. |
| Abstract: Waterborne polyurethanes (WPUs) are interesting materials for coatings when compared to solvent-based polyurethanes, once that reducing the concentration of volatile organic compounds that are harmful for human health and the environment. However, the WPU has low weathering resistance. In order to improve this behavior among others properties, inorganic fillers has been added in these systems. SiO2 particles from various sources, mainly, from agro-industrial waste, as rice husk has attracted the scientific and technological interest. In this study, the accelerated weathering essay was performed in waterborne polyurethane (WPU)/ silica (from rice husk ash) composites in order to evaluate the thermal and physical changes in these materials. These... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Waterborne polyurethane; Rice husk ash; Silica; Accelerated weathering resistance. |
| Ano: 2019 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652019000700403 |
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| Kawabata,Celso Yoji; Savastano Junior,Holmer; Sousa-Coutinho,Joana. |
| In this study rice husk ash (RHA) and broiler bed ash from rice husk (BBA), two agricultural waste materials, have been assessed for use as partial cement replacement materials for application in lightweight concrete. Physical and chemical characteristics of RHA and BBA were first analyzed. Three similar types of lightweight concrete were produced, a control type in which the binder was just CEMI cement (CTL) and two other types with 10% cement replacement with, respectively, RHA and BBA. All types of similar lightweight concrete were prepared to present the same workability by adjusting the amount of superplasticizer. Properties of concrete investigated were compressive and flexural strength at different ages, absorption by capillarity, resistivity and... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Agricultural waste; Rice husk ash; Broiler bed ash; Degradation. |
| Ano: 2012 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1413-70542012000500010 |
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