Behaviour of a starch as a viscosity modifier for aerial lime-based mortars
Different dosages of a commercialized potato starch were added to aerial lime-based mortars in order to check its efficiency as a rheological modifier. Several fresh state properties of the mortars were studied: consistency, density, air content, water retention capacity, setting time and evolution...
| Autores: | , , |
|---|---|
| Tipo de recurso: | artículo |
| Fecha de publicación: | 2010 |
| País: | España |
| Institución: | Universidad de Navarra |
| Repositorio: | Dadun. Depósito Académico Digital de la Universidad de Navarra |
| Idioma: | inglés |
| OAI Identifier: | oai:dadun.unav.edu:10171/27859 |
| Acceso en línea: | https://hdl.handle.net/10171/27859 |
| Access Level: | acceso abierto |
| Palabra clave: | Lime Mortar Action mechanism Thickener Starch Dispersing agent |
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oai:dadun.unav.edu:10171/27859 |
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España |
| spelling |
Behaviour of a starch as a viscosity modifier for aerial lime-based mortars Izaguirre, A. (Ana)|||/items/04e454cd-3cfa-42b0-aa23-b7a9163b2148 Lanas, J. (Javier)|||/items/adc6c03f-a341-4e49-ae5e-b32a86889598 Alvarez-Galindo, J.I. (José Ignacio)|||/items/c88ef755-513c-4ff3-bbff-44aadbf32204 Lime Mortar Action mechanism Thickener Starch Dispersing agent Different dosages of a commercialized potato starch were added to aerial lime-based mortars in order to check its efficiency as a rheological modifier. Several fresh state properties of the mortars were studied: consistency, density, air content, water retention capacity, setting time and evolution when applied on support. The effect of the starch on ζ-potential of the lime particle surface as well as the particle size distribution and viscosity changes in lime pastes were also assessed in order to elucidate the action mechanism of the polymer. The behaviour of this starch polymer was found to be strongly dosage-dependent: it acted as a thickener when the incorporated dosage was up to 0.30% of lime weight; conversely, above that dosage, it behaved as a plasticizer. The thickening effect took place because polymer molecules were adsorbed onto lime particles acting as a flocculant, as confirmed by zeta-potential and particle size distribution results. For large amounts of polymer, steric hindrance and electrostatic repulsive forces appeared, leading to a dispersion mechanism which explained the plasticizing effect as well as the fresh mortar behaviour. Elsevier https://hdl.handle.net/10171/27859 |
| title |
Behaviour of a starch as a viscosity modifier for aerial lime-based mortars |
| spellingShingle |
Behaviour of a starch as a viscosity modifier for aerial lime-based mortars Izaguirre, A. (Ana)|||/items/04e454cd-3cfa-42b0-aa23-b7a9163b2148 Lime Mortar Action mechanism Thickener Starch Dispersing agent |
| title_short |
Behaviour of a starch as a viscosity modifier for aerial lime-based mortars |
| title_full |
Behaviour of a starch as a viscosity modifier for aerial lime-based mortars |
| title_fullStr |
Behaviour of a starch as a viscosity modifier for aerial lime-based mortars |
| title_full_unstemmed |
Behaviour of a starch as a viscosity modifier for aerial lime-based mortars |
| title_sort |
Behaviour of a starch as a viscosity modifier for aerial lime-based mortars |
| author |
Izaguirre, A. (Ana)|||/items/04e454cd-3cfa-42b0-aa23-b7a9163b2148 |
| author_facet |
Izaguirre, A. (Ana)|||/items/04e454cd-3cfa-42b0-aa23-b7a9163b2148 Lanas, J. (Javier)|||/items/adc6c03f-a341-4e49-ae5e-b32a86889598 Alvarez-Galindo, J.I. (José Ignacio)|||/items/c88ef755-513c-4ff3-bbff-44aadbf32204 |
| author_role |
author |
| author2 |
Lanas, J. (Javier)|||/items/adc6c03f-a341-4e49-ae5e-b32a86889598 Alvarez-Galindo, J.I. (José Ignacio)|||/items/c88ef755-513c-4ff3-bbff-44aadbf32204 |
| author2_role |
author author |
| topic |
Lime Mortar Action mechanism Thickener Starch Dispersing agent |
| topic_facet |
Lime Mortar Action mechanism Thickener Starch Dispersing agent |
| description |
Different dosages of a commercialized potato starch were added to aerial lime-based mortars in order to check its efficiency as a rheological modifier. Several fresh state properties of the mortars were studied: consistency, density, air content, water retention capacity, setting time and evolution when applied on support. The effect of the starch on ζ-potential of the lime particle surface as well as the particle size distribution and viscosity changes in lime pastes were also assessed in order to elucidate the action mechanism of the polymer. The behaviour of this starch polymer was found to be strongly dosage-dependent: it acted as a thickener when the incorporated dosage was up to 0.30% of lime weight; conversely, above that dosage, it behaved as a plasticizer. The thickening effect took place because polymer molecules were adsorbed onto lime particles acting as a flocculant, as confirmed by zeta-potential and particle size distribution results. For large amounts of polymer, steric hindrance and electrostatic repulsive forces appeared, leading to a dispersion mechanism which explained the plasticizing effect as well as the fresh mortar behaviour. |
| publishDate |
2010 |
| format |
article |
| url |
https://hdl.handle.net/10171/27859 |
| language |
eng |
| eu_rights_str_mv |
openAccess |
| publisher |
Elsevier |
| institution |
Universidad de Navarra |
| collection |
Dadun. Depósito Académico Digital de la Universidad de Navarra |
| reponame_str |
Dadun. Depósito Académico Digital de la Universidad de Navarra |
| instname_str |
Universidad de Navarra |
| _version_ |
1878441528365416448 |
| publishDateSort |
2010 |
| author_browse |
Alvarez-Galindo, J.I. (José Ignacio)|||/items/c88ef755-513c-4ff3-bbff-44aadbf32204 Izaguirre, A. (Ana)|||/items/04e454cd-3cfa-42b0-aa23-b7a9163b2148 Lanas, J. (Javier)|||/items/adc6c03f-a341-4e49-ae5e-b32a86889598 |
| publisherStr |
Elsevier |
| score |
6,9303427 |