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Registro Completo |
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Biblioteca(s): |
Embrapa Semiárido. |
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Data corrente: |
04/06/1997 |
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Data da última atualização: |
30/10/2013 |
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Autoria: |
OLIVEIRA, G. M. de A.; ARAUJO, L. B. de. |
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Título: |
Salitre na Bahia. |
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Ano de publicação: |
1945 |
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Fonte/Imprenta: |
Rio de Janeiro: DNPM, 1945. |
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Páginas: |
66 p. |
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Descrição Física: |
il. |
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Série: |
(Brasil. DNPM. Boletim, 66). |
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Idioma: |
Português |
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Conteúdo: |
Descreve a situacao geografica das areas estudadas, as ocorrencias saliferas das regioes calcarias e dos arenitos. Traz conclusoes sobre o valor das ocorrencias de nitratos das regioes calcarias, bem como salitre das regioes de arenitos. Traz tambem parecer sobre o problema de suprimento de salitre no Brasil e metodos de analise e processo de preparacao do Salitre. |
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Palavras-Chave: |
Arenito; Bahia; Natural resource; Ocorrencia; Recursos naturais; Salitre. |
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Thesagro: |
Análise; Calcário; Geologia; Nitrato; Recurso natural. |
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Categoria do assunto: |
P Recursos Naturais, Ciências Ambientais e da Terra |
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Marc: |
LEADER 01022nam a2200277 a 4500
001 1127777
005 2013-10-30
008 1945 bl uuuu 00u1 u #d
100 1 $aOLIVEIRA, G. M. de A.
245 $aSalitre na Bahia.
260 $aRio de Janeiro: DNPM$c1945
300 $a66 p.$cil.
490 $a(Brasil. DNPM. Boletim, 66).
520 $aDescreve a situacao geografica das areas estudadas, as ocorrencias saliferas das regioes calcarias e dos arenitos. Traz conclusoes sobre o valor das ocorrencias de nitratos das regioes calcarias, bem como salitre das regioes de arenitos. Traz tambem parecer sobre o problema de suprimento de salitre no Brasil e metodos de analise e processo de preparacao do Salitre.
650 $aAnálise
650 $aCalcário
650 $aGeologia
650 $aNitrato
650 $aRecurso natural
653 $aArenito
653 $aBahia
653 $aNatural resource
653 $aOcorrencia
653 $aRecursos naturais
653 $aSalitre
700 1 $aARAUJO, L. B. de
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Registro original: |
Embrapa Semiárido (CPATSA) |
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 | Acesso ao texto completo restrito à biblioteca da Embrapa Instrumentação. Para informações adicionais entre em contato com cnpdia.biblioteca@embrapa.br. |
Registro Completo
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Biblioteca(s): |
Embrapa Instrumentação. |
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Data corrente: |
23/09/2021 |
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Data da última atualização: |
10/06/2022 |
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Tipo da produção científica: |
Artigo em Periódico Indexado |
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Circulação/Nível: |
B - 2 |
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Autoria: |
SILVA, D. W.; BUFALINO, L.; MARTINS, M. A.; SAVASTANO JÚNIOR, H.; TONOLI, G. H. D.; MENDES, L. M. |
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Afiliação: |
MARIA ALICE MARTINS, CNPDIA. |
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Título: |
Superabsorbent ability polymer to reduce the bulk density of extruded cement boards. |
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Ano de publicação: |
2021 |
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Fonte/Imprenta: |
Journal of Building Engineering, v. 43, 103130, 2021. |
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Páginas: |
1 - 7 |
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ISSN: |
2352-7102 |
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DOI: |
https://doi.org/10.1016/j.jobe.2021.103130 |
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Idioma: |
Inglês |
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Conteúdo: |
The extrusion process has numerous advantages in the production of cement materials; however, cement extruded products over gain bulk density, adding costs to their fixation, workability, and application as structural reinforcement. The objective of this research was to develop and test extruded lightweight cement-based boards with the addition of superabsorbent polymer (SAP). A plain cement board containing 70% of cement and 30% of limestone filler was prepared. The different percentages of SAP from 0.0 to 2.0% based on cement mass did not interfere in the extrusion process. However, an expansion of the cement boards containing 1.0, 1.5, and 2.0% SAP occurred when passing through the extruder nozzle. The apparent porosity increased, and millimetric voids arose in the cement boards by increasing the SAP percentage. The apparent density of the cement boards favorably decreased from 8.6 to 28.4% by adding different percentages of SAP. However, the microstructural modifications raised the water absorption and substantially decreased the mechanical performance. Still, adding only 0.5% of SAP reduced the bulk density by about 10% without substantially decreasing the mechanical performance of the cement boards. Therefore, the SAP was very efficient in producing lightweight cement boards by extrusion. |
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Palavras-Chave: |
Air-entraining; Cement materials. |
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Categoria do assunto: |
-- |
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Marc: |
LEADER 02035naa a2200241 a 4500
001 2134735
005 2022-06-10
008 2021 bl uuuu u00u1 u #d
022 $a2352-7102
024 7 $ahttps://doi.org/10.1016/j.jobe.2021.103130$2DOI
100 1 $aSILVA, D. W.
245 $aSuperabsorbent ability polymer to reduce the bulk density of extruded cement boards.$h[electronic resource]
260 $c2021
300 $a1 - 7
520 $aThe extrusion process has numerous advantages in the production of cement materials; however, cement extruded products over gain bulk density, adding costs to their fixation, workability, and application as structural reinforcement. The objective of this research was to develop and test extruded lightweight cement-based boards with the addition of superabsorbent polymer (SAP). A plain cement board containing 70% of cement and 30% of limestone filler was prepared. The different percentages of SAP from 0.0 to 2.0% based on cement mass did not interfere in the extrusion process. However, an expansion of the cement boards containing 1.0, 1.5, and 2.0% SAP occurred when passing through the extruder nozzle. The apparent porosity increased, and millimetric voids arose in the cement boards by increasing the SAP percentage. The apparent density of the cement boards favorably decreased from 8.6 to 28.4% by adding different percentages of SAP. However, the microstructural modifications raised the water absorption and substantially decreased the mechanical performance. Still, adding only 0.5% of SAP reduced the bulk density by about 10% without substantially decreasing the mechanical performance of the cement boards. Therefore, the SAP was very efficient in producing lightweight cement boards by extrusion.
653 $aAir-entraining
653 $aCement materials
700 1 $aBUFALINO, L.
700 1 $aMARTINS, M. A.
700 1 $aSAVASTANO JÚNIOR, H.
700 1 $aTONOLI, G. H. D.
700 1 $aMENDES, L. M.
773 $tJournal of Building Engineering$gv. 43, 103130, 2021.
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