The effect of segregation on transport and durability properties of self consolidating concrete

Panesar, Daman K.; Shindman, B.

doi:10.1016/j.cemconres.2011.09.011

Cited by 62 publications

(21 citation statements)

References 15 publications

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“…Increased flowability of the concrete mixture can cause problems with constituent materials stability and successful application of the SCC technology. It has been derived (Panesar & Shindman, 2012) that SCC due to its particular plastic property is much more susceptible to stability problems than conventionally consolidated concrete. Furthermore, they showed that the use of high-quality ingredients and maintaining their right proportions does not guarantee good segregation resistance.…”

Section: Introductionmentioning

confidence: 99%

“…The segregation tendency in the vibration of high fluidity concrete according to Bui, Montgomery, Hinczak, and Turner (2002), segregation may lead to nonuniform results of compressive strength tests, which is confirmed by experience (Zhu, Gibbs, & Bartos, 2001;Swedish Concrete Association, 2002). According to Panesar and Shindman (2012), apart from inhomogeneity of aggregate distribution in concrete, instability causes a weakening of the contact zone between aggregate and cement paste and can affect the bond behavior of concrete and steel reinforcement. The self-compacting concrete mixtures contain a higher volume of cement paste, which makes them more susceptible to shrinkage cracking than traditional concretes (Szwabowski, 2004;Szwabowski & Gołaszewski, 2010).…”

Section: Introductionmentioning

confidence: 99%

“…The research results showed that the method can be successfully applied to assess the segregation resistance of SCC on site. The comprehensive research (Panesar & Shindman, 2012) examined segregation performance measured on SCC mix by column method, visual stability index and V-funnel test. The research results achieved on fresh SCC mix was correlated to physical properties of hardened concrete.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Quantitative assessment of aggregate segregation of hardened self compacted concrete based on 2D image analysis

Wawrzeńczyk

Molendowska

Kłak

2019

Modern Building Materials, Structures and Techniques (MBMST)

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Self-compacting concrete developed as a material that does not need vibration for compaction has been increasingly being used in routine practice. Successful application of self-compacting concrete (SCC) is difficult to achieve due to increased flowability of the concrete mixture. Segregation of aggregate is one of the major problems during construction and ultimately influences the strength and durability of SCC. A fresh self-compacting concrete with poor segregation resistance can lead to a nonuniform distribution of coarse aggregates in the concrete volume, contributing to blockage of concrete flow, and nonuniform mechanical properties and durability at the hardened concrete. The article presents the unique method for quantitative assessment of aggregate segregation in hardened self-compacted concrete. A digital image analysis procedure using original lighting microscope equipment has been placed to investigate the concrete segregation behavior. The photographs of concrete specimen surfaces were taken to calculate measurements of aggregate volume in concrete. The research results showed that the originally developed attachment and unique aggregate segregation assessment method are useful in laboratory tests and could be used in the on-site application.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Quantitative assessment of aggregate segregation of hardened self compacted concrete based on 2D image analysis

Wawrzeńczyk

Molendowska

Kłak

2019

Modern Building Materials, Structures and Techniques (MBMST)

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“…La capacidad de paso depende en gran medida del contenido en áridos y su tamaño máximo, además de su granulometría y la cohesión de la mezcla [1], [2]. La estabilidad puede medirse a través del índice visual de segregación o VSI [3], depende de la cohesión de la mezcla y de su viscosidad [4], que no debe verse reducida en exceso para evitar que la mezcla presente tendencia a segregar. El incremento del contenido en finos, mediante la incorporación de filler o adiciones activas, contribuye a una mayor cohesión.…”

Section: -Introducciónunclassified

Un nuevo enfoque para optimizar dosificaciones de hormigón autocompactante

Linden

García-Taengua

2018

Libro De Comunicaciones / Livro Das Comunicações

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RESUMENTodo procedimiento para diseñar hormigones autocompactantes comprende dos etapas: la aplicación de un método de dosificación, y el ajuste de la mezcla mediante amasadas de prueba. Ambas se centran en el comportamiento del hormigón en estado fresco, buscándose maximizar tres propiedades fundamentales: fluidez, capacidad de llenado, y estabilidad. Este estudio propone formular matemáticamente el comportamiento en fresco del hormigón autocompactante como un fenómeno multivariado. Este nuevo enfoque posibilita una optimización más robusta de los hormigones autocompactantes. Con esta finalidad, se ha llevado a cabo un metanálisis de cerca de trescientas dosificaciones recogidas de distintas fuentes, abarcando: las propiedades de los materiales utilizados y sus cantidades relativas; los resultados de los ensayos de escurrimiento, embudo en V, anillo en J, caja en L, e índice visual de segregación; y la resistencia media a compresión simple. Se han estudiado las relaciones de codependencia entre los distintos parámetros medibles, y cómo estas relaciones se ven afectadas por cambios en la dosificación.PALABRAS CLAVE: dosificación, optimización, resistencia, segregación. 1.-INTRODUCCIÓNLas dosificaciones de hormigón autocompactante (HAC) buscan tres características fundamentales: capacidad de llenado, capacidad de paso, y estabilidad. La capacidad de llenado se puede modificar fácilmente con aditivos superplastificantes, pero asegurar al mismo tiempo un nivel adecuado de capacidad de llenado y estabilidad es más complejo. La capacidad de paso depende en gran medida del contenido en áridos y su tamaño máximo, además de su granulometría y la cohesión de la mezcla [1], [2]. La estabilidad puede medirse a través del índice visual de segregación o VSI [3], depende de la cohesión de la mezcla y de su viscosidad [4], que no debe verse reducida en exceso para evitar que la mezcla presente tendencia a segregar. El incremento del contenido en finos, mediante la incorporación de filler o adiciones activas, contribuye a una mayor cohesión. La adición de reguladores de la viscosidad es una estrategia complementaria a las anteriores al compensar 167

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“…According to Panesar and Shindman [7], segregated concretes are susceptible to an increased risk of cracking by cause of the separation of the aggregates from the rest of the mixture. To quantify the phenomenon of segregation, Ke and Beaucour propose several methods to determine segregation index [6].…”

Section: Introductionmentioning

confidence: 99%

Numerical model for describing the segregation phenomenon in lightweight concrete using density sections

Tenza-Abril¹,

Villacampa²,

Baeza-Brotons³

et al. 2017

Int. J. CMEM

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In this work, numerical models were obtained for describing the segregation phenomenon in lightweight aggregate concrete. To that end, a numerical methodology based on the generation of geometric models of finite elements has been applied, selecting those that describe better this phenomenon. The use of lightweight aggregate concretes (LWC) allows greater design flexibility and substantial cost savings. It is also well known that it contributes to a positive impact on the energy consumption of a building due to the high-thermal resistance values. However, lightweight concretes are susceptible to present aggregate segregation due to density differences between its components during concrete vibration. Segregation in concrete may strongly affect the concrete global properties. This fact justifies the needs for the identification and quantification of this phenomenon, in order to estimate the concrete segregation experimentally, a LWC was mixed in laboratory conditions. Controlled segregation was caused applying different times of internal vibration in a cylinder specimen. The specimens were horizontally sectioned in order to obtain the density in each section because the segregation index can be estimated obtaining a relation by comparing the densities of the upper and lower parts. Firstly, ANOVA test was performed to determine the statistical significance (p<0.05) of the differences in the density of the different sections, differences in the aggregate type and differences in the time of concrete vibration. Results show that there is a significant difference of each section and there is no significant difference of each lightweight aggregate used to mix the concrete in spite of their different density. In order to model the segregation in the LWC, at first, linear models were considered and rejected because for not explaining the phenomenon. However, the application of numerical models shows good results to describe the phenomenon of segregation in LWC.

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The effect of segregation on transport and durability properties of self consolidating concrete

Cited by 62 publications

References 15 publications

Quantitative assessment of aggregate segregation of hardened self compacted concrete based on 2D image analysis

Quantitative assessment of aggregate segregation of hardened self compacted concrete based on 2D image analysis

Un nuevo enfoque para optimizar dosificaciones de hormigón autocompactante

Numerical model for describing the segregation phenomenon in lightweight concrete using density sections

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