Rheological methods for assessing the flow properties of mortar and related materials

Banfill, Phillip Frank Gower

doi:10.1016/0950-0618(94)90007-8

Cited by 132 publications

(71 citation statements)

References 3 publications

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“…Banfill [1] observó que al aumentar el contenido de agua, manteniendo constantes las proporciones de los otros constituyentes, disminuía el esfuerzo umbral de cizalla y la viscosidad. Por otra parte, la disminución del tamaño máximo del árido requiere aumentar el contenido de agua en la mezcla, y además, el aumento de la finura del árido, generalmente, conduce a incrementos en esfuerzo umbral de cizalla y en la viscosidad [2][3][4].…”

Section: -Introducciónunclassified

Influencia de la naturaleza y granulometría de los áridos en el comportamiento reológico de morteros de cementos activados alcalinamente

Gismera-Diez

Alonso

Puertas³

2018

Libro De Comunicaciones / Livro Das Comunicações

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RESUMENEl objetivo de este trabajo es profundizar en el conocimiento del comportamiento reologico de morteros de cementos activados alcalinamente (Alkali-Activated Materials, AAMs), determinando el efecto del diámetro máximo del árido y su naturaleza (silíceo, calizo y árido reciclado). Morteros de OPC se utilizan de referencia. Se realizaron ensayos de fluidez y de Stress Growth Test; también se determinaron los parámetros reológicos por el ensayo de curva de flujo. Los morteros de AAMs son más sensible que los de OPC a la variación del diámetro máximo de los áridos; aunque no se han observado diferentes comportamientos asociados a la naturaleza del mismo. Se ha demostrado que todos los morteros se ajustan al modelo reológico de Bingham, independientemente del diámetro máximo de los áridos y de la naturaleza de los mismos.PALABRAS CLAVE: comportamiento reologico, diámetro máximo de árido, morteros, geopolímeros, áridos reciclados. 1.-INTRODUCCIÓNSon muchos los estudios realizados sobre los factores que afectan a la reología y trabajabilidad de los morteros de cemento portland (OPC), entre ellos destacan: el contenido de agua, la relación árido/ligante, el tamaño, la forma y naturaleza del árido, la adición de aditivos, etc. Banfill [1] observó que al aumentar el contenido de agua, manteniendo constantes las proporciones de los otros constituyentes, disminuía el esfuerzo umbral de cizalla y la viscosidad. Por otra parte, la disminución del tamaño máximo del árido requiere aumentar el contenido de agua en la mezcla, y además, el aumento de la finura del árido, generalmente, conduce a incrementos en esfuerzo umbral de cizalla y en la viscosidad [2][3][4]. Los morteros con árido triturado presentan un mayor esfuerzo umbral de cizalla y una mayor viscosidad plástica que los morteros con áridos con morfologías redondeadas [4]. La reutilización de árido procedente de residuos de construcción supone un paso más para la eco-eficiencia y su influencia en el comportamiento mecánico y 55

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Section: -Introducciónunclassified

Influencia de la naturaleza y granulometría de los áridos en el comportamiento reológico de morteros de cementos activados alcalinamente

Gismera-Diez

Alonso

Puertas³

2018

Libro De Comunicaciones / Livro Das Comunicações

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“…where and ℎ are two material characteristics that are related to the yield stress and plastic viscosity, respectively (Tattersal and Banfill, 1983;Banfill, 1994;Banfill, 1995). is the intercept of the flow curves with the torque axis, in Nmm; and ℎ is the slope of flow curves, in Nmms, and will be used throughout the paper to reflect the rheological properties of mortars.…”

Section: Grout Rheologymentioning

confidence: 99%

“…However, if the grout is not fluid enough, the pressure gradient created by grout weight in the funnel of the flow cone is not sufficient to overcome the yield stress in the nozzle (Roussel and Roy, 2005 Tattersall and Banfill (1983) reported that the mortar consistency should be identified by two point tests in which the rheological properties can be measured, namely yield stress and plastic viscosity. Viskomat NT is capable of producing the flow curves of mortar with high accuracy and, from these curves, the rheological parameters can be predicted (Banfill, 1994 and.…”

Section: Introductionmentioning

confidence: 99%

Grout rheological properties for preplaced aggregate concrete production

Ganaw¹,

Hughes²,

Ashour³

2014

Proceedings of the Institution of Civil Engineers - Constructio

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This paper investigates the effect of cement based grout rheology on the injection process through coarse aggregate for producing preplaced aggregate concrete (PAC). Four different sands were used in the grout production at different watercement ratios and cement-sand ratios. Superplasticiers (SP) and pulverised fuel ash (Pfa) were also employed in the grout production. Coarse aggregate of known weight was compacted into 150mm cubic forms, and then the grout was injected through a plastic pipe under self weight into the stone skeleton. It has been found that thereare threshold values of the rheological parameters beyond which full injection is not possible. In particular, all grout mixes with and without additives and admixtures exhibited the same yield stress threshold value for full injection, whereas the threshold values for other rheological properties including the grout plastic viscosity, flow time and speed were different according to the materials added to the mix.

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“…Banfill [12] found that both the yield stress and viscosity of mortar decrease exponentially with the water content. In other studies, it has been found that the characteristics of the fine aggregate also have significant effects.…”

Section: Introductionmentioning

confidence: 99%

Combined effects of water film thickness and paste film thickness on rheology of mortar

Kwan

2012

Mater Struct

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In the mortar portion of a concrete mix, the water must be more than sufficient to fill the voids between the solid particles of cement and fine aggregate whereas the paste volume must be more than sufficient to fill the voids between the solid particles of fine aggregate so that there will be excess water to form water films coating all the solid particles and excess paste to form paste films coating the fine aggregate particles. Hence, it may be postulated that the water film thickness (WFT) and the paste film thickness (PFT) have major effects on the rheology of mortar. In this study, the combined effects of WFT and PFT on the rheology, cohesiveness and adhesiveness of mortar were investigated by testing mortar samples with varying water, cement and aggregate contents. It was found that whilst the WFT is the single most important factor governing the rheology of mortar, the PFT also has significant effects. Particularly, the PFT has certain interesting effects on the cohesiveness and adhesiveness of mortar, which should be duly considered in mortar design.

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Rheological methods for assessing the flow properties of mortar and related materials

Cited by 132 publications

References 3 publications

Influencia de la naturaleza y granulometría de los áridos en el comportamiento reológico de morteros de cementos activados alcalinamente

Influencia de la naturaleza y granulometría de los áridos en el comportamiento reológico de morteros de cementos activados alcalinamente

Grout rheological properties for preplaced aggregate concrete production

Combined effects of water film thickness and paste film thickness on rheology of mortar

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