The Experts below are selected from a list of 75 Experts worldwide ranked by ideXlab platform
Angel Palomo - One of the best experts on this subject based on the ideXlab platform.
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alkaline Solution Binder ratio as a determining factor in the alkaline activation of aluminosilicates
Cement and Concrete Research, 2012Co-Authors: C Ruizsantaquiteria, J Skibsted, Ana Fernandezjimenez, Angel PalomoAbstract:Abstract This study investigates the effect of the alkaline Solution/Binder (S/B) ratio on the composition and nanostructure of the reaction products generated in the alkaline activation of aluminosilicates. The experiments used two mixtures of fly ash and dehydroxylated white clay and for each of these, varying proportions of the Solution components. The alkali activator was an 8 M NaOH Solution (with and without sodium silicate) used at three S/B ratios: 0.50, 0.75 and 1.25. The 29 Si, 27 Al MAS NMR and XRD characterisation of the reaction products reveal that for ratios nearest the value delivering suitable paste workability, the reaction-product composition and structure depend primarily on the nature and composition of the starting materials and the alkaline activator used. However, when an excess alkaline activator is present in the system, the reaction products tend to exhibit SiO 2 /Al 2 O 3 ratios of approximately 1, irrespective of the composition of the starting Binder or the alkaline activator.
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Alkaline Solution/Binder ratio as a determining factor in the alkaline activation of aluminosilicates
Cement and Concrete Research, 2012Co-Authors: C. Ruiz-santaquiteria, J Skibsted, Ana Fernández-jiménez, Angel PalomoAbstract:Abstract This study investigates the effect of the alkaline Solution/Binder (S/B) ratio on the composition and nanostructure of the reaction products generated in the alkaline activation of aluminosilicates. The experiments used two mixtures of fly ash and dehydroxylated white clay and for each of these, varying proportions of the Solution components. The alkali activator was an 8 M NaOH Solution (with and without sodium silicate) used at three S/B ratios: 0.50, 0.75 and 1.25. The 29 Si, 27 Al MAS NMR and XRD characterisation of the reaction products reveal that for ratios nearest the value delivering suitable paste workability, the reaction-product composition and structure depend primarily on the nature and composition of the starting materials and the alkaline activator used. However, when an excess alkaline activator is present in the system, the reaction products tend to exhibit SiO 2 /Al 2 O 3 ratios of approximately 1, irrespective of the composition of the starting Binder or the alkaline activator.
Göran Alderborn - One of the best experts on this subject based on the ideXlab platform.
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Compression Shear Strength and Tableting Behavior of Microcrystalline Cellulose Agglomerates Modulated by a Solution Binder (Polyethylene Glycol)
Pharmaceutical Research, 2001Co-Authors: Fredrik Nicklasson, Göran AlderbornAbstract:Purpose . To investigate the possibility of modulating the compression shear strength of agglomerates by the incorporation of a Solution Binder and to study the subsequent effect on the deformation behavior and tablet forming ability of the agglomerates. Method . Various concentrations (0.5 to 10%) of polyethylene glycol were incorporated as a Solution Binder into microcrystalline cellulose agglomerates of different porosity (10 and 20%) and the shear strength of the agglomerates, as evaluated by the 1/b value of the Kawakita equation, and the permeability to air and tensile strength of tablets formed from them were determined. Results . Increased agglomerate porosity and concentration of polyethylene glycol reduced the 1/b values, which led to the formation of tablets with a lower permeability. A decreased tablet permeability corresponded to an increased tablet tensile strength except that the highest Binder content was associated with a drop in the tablet tensile strength. Conclusions . The Solution Binder reduced the agglomerate shear strength, which was expressed as an increased degree of agglomerate deformation during compression. The latter seemed to be controlled by both agglomerate porosity and shear strength. The main role of the Solution Binder in improving the agglomerate compactability was to increase the degree of deformation of agglomerates during compression.
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compression shear strength and tableting behavior of microcrystalline cellulose agglomerates modulated by a Solution Binder polyethylene glycol
Pharmaceutical Research, 2001Co-Authors: Fredrik Nicklasson, Göran AlderbornAbstract:Purpose. To investigate the possibility of modulating the compression shear strength of agglomerates by the incorporation of a Solution Binder and to study the subsequent effect on the deformation behavior and tablet forming ability of the agglomerates.
C Ruizsantaquiteria - One of the best experts on this subject based on the ideXlab platform.
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alkaline Solution Binder ratio as a determining factor in the alkaline activation of aluminosilicates
Cement and Concrete Research, 2012Co-Authors: C Ruizsantaquiteria, J Skibsted, Ana Fernandezjimenez, Angel PalomoAbstract:Abstract This study investigates the effect of the alkaline Solution/Binder (S/B) ratio on the composition and nanostructure of the reaction products generated in the alkaline activation of aluminosilicates. The experiments used two mixtures of fly ash and dehydroxylated white clay and for each of these, varying proportions of the Solution components. The alkali activator was an 8 M NaOH Solution (with and without sodium silicate) used at three S/B ratios: 0.50, 0.75 and 1.25. The 29 Si, 27 Al MAS NMR and XRD characterisation of the reaction products reveal that for ratios nearest the value delivering suitable paste workability, the reaction-product composition and structure depend primarily on the nature and composition of the starting materials and the alkaline activator used. However, when an excess alkaline activator is present in the system, the reaction products tend to exhibit SiO 2 /Al 2 O 3 ratios of approximately 1, irrespective of the composition of the starting Binder or the alkaline activator.
J Skibsted - One of the best experts on this subject based on the ideXlab platform.
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alkaline Solution Binder ratio as a determining factor in the alkaline activation of aluminosilicates
Cement and Concrete Research, 2012Co-Authors: C Ruizsantaquiteria, J Skibsted, Ana Fernandezjimenez, Angel PalomoAbstract:Abstract This study investigates the effect of the alkaline Solution/Binder (S/B) ratio on the composition and nanostructure of the reaction products generated in the alkaline activation of aluminosilicates. The experiments used two mixtures of fly ash and dehydroxylated white clay and for each of these, varying proportions of the Solution components. The alkali activator was an 8 M NaOH Solution (with and without sodium silicate) used at three S/B ratios: 0.50, 0.75 and 1.25. The 29 Si, 27 Al MAS NMR and XRD characterisation of the reaction products reveal that for ratios nearest the value delivering suitable paste workability, the reaction-product composition and structure depend primarily on the nature and composition of the starting materials and the alkaline activator used. However, when an excess alkaline activator is present in the system, the reaction products tend to exhibit SiO 2 /Al 2 O 3 ratios of approximately 1, irrespective of the composition of the starting Binder or the alkaline activator.
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Alkaline Solution/Binder ratio as a determining factor in the alkaline activation of aluminosilicates
Cement and Concrete Research, 2012Co-Authors: C. Ruiz-santaquiteria, J Skibsted, Ana Fernández-jiménez, Angel PalomoAbstract:Abstract This study investigates the effect of the alkaline Solution/Binder (S/B) ratio on the composition and nanostructure of the reaction products generated in the alkaline activation of aluminosilicates. The experiments used two mixtures of fly ash and dehydroxylated white clay and for each of these, varying proportions of the Solution components. The alkali activator was an 8 M NaOH Solution (with and without sodium silicate) used at three S/B ratios: 0.50, 0.75 and 1.25. The 29 Si, 27 Al MAS NMR and XRD characterisation of the reaction products reveal that for ratios nearest the value delivering suitable paste workability, the reaction-product composition and structure depend primarily on the nature and composition of the starting materials and the alkaline activator used. However, when an excess alkaline activator is present in the system, the reaction products tend to exhibit SiO 2 /Al 2 O 3 ratios of approximately 1, irrespective of the composition of the starting Binder or the alkaline activator.
Fredrik Nicklasson - One of the best experts on this subject based on the ideXlab platform.
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Compression Shear Strength and Tableting Behavior of Microcrystalline Cellulose Agglomerates Modulated by a Solution Binder (Polyethylene Glycol)
Pharmaceutical Research, 2001Co-Authors: Fredrik Nicklasson, Göran AlderbornAbstract:Purpose . To investigate the possibility of modulating the compression shear strength of agglomerates by the incorporation of a Solution Binder and to study the subsequent effect on the deformation behavior and tablet forming ability of the agglomerates. Method . Various concentrations (0.5 to 10%) of polyethylene glycol were incorporated as a Solution Binder into microcrystalline cellulose agglomerates of different porosity (10 and 20%) and the shear strength of the agglomerates, as evaluated by the 1/b value of the Kawakita equation, and the permeability to air and tensile strength of tablets formed from them were determined. Results . Increased agglomerate porosity and concentration of polyethylene glycol reduced the 1/b values, which led to the formation of tablets with a lower permeability. A decreased tablet permeability corresponded to an increased tablet tensile strength except that the highest Binder content was associated with a drop in the tablet tensile strength. Conclusions . The Solution Binder reduced the agglomerate shear strength, which was expressed as an increased degree of agglomerate deformation during compression. The latter seemed to be controlled by both agglomerate porosity and shear strength. The main role of the Solution Binder in improving the agglomerate compactability was to increase the degree of deformation of agglomerates during compression.
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compression shear strength and tableting behavior of microcrystalline cellulose agglomerates modulated by a Solution Binder polyethylene glycol
Pharmaceutical Research, 2001Co-Authors: Fredrik Nicklasson, Göran AlderbornAbstract:Purpose. To investigate the possibility of modulating the compression shear strength of agglomerates by the incorporation of a Solution Binder and to study the subsequent effect on the deformation behavior and tablet forming ability of the agglomerates.