Compaction-interaction packing model: regarding the effect of fillers in concrete mixture design

Fennis, S.A.A.M.; Walraven, J.C.; Uijl, J.A. den

doi:10.1617/s11527-012-9910-6

Cited by 66 publications

(48 citation statements)

References 8 publications

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“…This difference is most likely a result of the inability of the CPM model in predicting the attraction effects between the fine particles. This feature of the model has been highlighted in the literature by other authors [19,26], who recommend to consider the interaction effects between the fine particles in predicting the particle packing density. Figure 5 -Variation of the particle packing density for the mixture of cement and silica fume according to the CPM…”

Section: Figure 4 -Voids Ratio and Solid Concentration Of The Producementioning

confidence: 85%

Particle packing of cement and silica fume in pastes using an analytical model

Hermann

Langaro

Silva

et al. 2016

Rev. IBRACON Estrut. Mater.

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ResumoWhen added to concrete in appropriate content, silica fume may provide an increase in the mechanical strength of the material due to its high pozzolanic reactivity. In addition to the chemical contribution, physical changes can also be observed in concretes with silica fume due to an improvement in the particle packing of the paste. This is a result of their small size spherical particles, which fill the voids between the larger cement grains. However, it is necessary to properly establish the cement replacement content by silica fume, because at high amounts, which exceed the volume of voids between the cement particles, silica fume can promote the loosening of these particles. Thus, instead of filling the voids and increasing the packing density, the addition of silica fume will increase the volume of voids, decreasing the solid concentration. Consequently, this will impair the properties of the concrete. The objective of this paper is to use a particle packing analytical model, the CPM (Compressible Packing Model), to verify the maximum packing density of cement and silica fume, which could be associated with the silica fume optimum content in pastes. The ideal content of silica fume in pastes, mortars and concretes is usually experimentally determined. However, a theoretical study to contrast experimental data may help understanding the behaviour of silica fume in mixes. Theoretical results show maximum amounts of silica fume in the order of 18 to 20% of the cement weight, which is high considering recommendations on literature of 15%. Nevertheless, the packing model does not consider the effect of silica fume high specific surface on the agglomeration of particles or water demand. Hence, the packing density predicted by this model cannot be used as the single parameter in determining the optimum amount of silica fume in pastes.Keywords: silica fume; packing of fine particles; wet packing; analytical model; CPM.Pela sua pozolanicidade e alta reatividade, a sílica ativa, quando adicionada ao concreto em porcentagens adequadas, pode proporcionar um aumento na resistência mecânica do material. Além da contribuição química, alterações físicas no concreto com sílica ativa também são observadas pela melhora no empacotamento de partículas na pasta, resultado de suas pequenas partículas esféricas que preenchem os vazios entre os grãos de cimento, de maior tamanho. Para tanto, é necessário prever o teor de substituição adequadamente, pois em teores muito elevados, que superem o volume de vazios entre as partículas de cimento, a sílica pode promover o afastamento destas partículas. Assim, ao invés de preencher os vazios e aumentar a densidade de empacotamento, a adição de sílica irá aumentar o volume de vazios, diminuindo a concentração de sólidos na pasta e, consequentemente, prejudicando as propriedades do concreto. Dessa forma, o objetivo deste trabalho é utilizar um modelo analítico de empacotamento de partículas, o CPM (do inglês Compressible Packing Model), para verificar a densidade de empacotame...

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Section: Figure 4 -Voids Ratio and Solid Concentration Of The Producementioning

confidence: 85%

Particle packing of cement and silica fume in pastes using an analytical model

Hermann

Langaro

Silva

et al. 2016

Rev. IBRACON Estrut. Mater.

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show abstract

“…This method has been widely used for concrete mixture design to optimize the packing densities of cement, mortar and concrete (e.g. Kwan and Fung, 2009;Fennis et al, 2013). Methods similar to the formulation by de Larrard (1999) can also be found in the field of powder mixes by Stovall et al (1986) and Yu and Standish (1987), which are commonly used in the pharmaceutical industry.…”

Section: Accepted Manuscriptmentioning

confidence: 99%

Modeling of minimum void ratio for sand–silt mixtures

Chang

Wang

2015

Engineering Geology

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“…In studies regarding the particle-packing density of materials, scholars have proposed different mathematical models, which include the Furnas Model (Furnas 1928), Westman and Hugill Model (Westman and Hugill 1930) and its extension (Westman 1936), Aïm and Goff Model (Aïm and Goff 1968), modified Toufar Model (Goltermann et al 1997), Dewar Model (Dewar 1999), Solid Suspension Model (de Larrard and Sedran 1994), Linear Packing Density Model (de Larrard and Sedran 1994;Stovall et al 1986), Compressive Packing Model (also named Compressible Packing Model) (de Larrard 1999; de Larrard and Sedran 1994) and Compactioninteraction Packing Model (Fennis et al 2013). Each of these models can act as a useful tool for calculating the packing density of cementitious ingredients.…”

Section: Introductionmentioning

confidence: 99%

“…They have been used already to investigate the packing properties of concrete mixtures consisting of coarse aggregate, fine aggregate and cementitious materials. Scholars have attempted to link the calculating results with performance of the concrete and to optimize the mix proportions based on the properties of granular materials (Amario et al 2017;Borges et al 2014;Brouwers and Radix 2005;de Larrard 1989;Sedran 1994, 2002;Fennis et al 2013;Hüsken and Brouwers 2008;Van-Tuan et al 2011;Ng and Foster 2013;Peng 2009;Stovall et al 1986;Su et al 2001;Yu et al 2014Yu et al , 2015.…”

Section: Introductionmentioning

confidence: 99%

“…However, the above-mentioned models are not suitable to calculate the packing density of concrete mixture that generally consists of continuously graded ingredients. The reason is that these models are mainly based on the packing properties of binary or polydispersed particle mixes (Aïm and Goff 1968;de Larrard 1999;de Larrard and Sedran 1994;Dewar 1999;Fennis et al 2013;Furnas 1928;Goltermann et al 1997;Stovall et al 1986;Westman 1936;Westman and Hugill 1930), and that these models are using the packing of monosized particles to predict the packing of the concrete mixture made up of continuously graded size particles. Thus, there is inevitably a quite large deviation between the theoretical and the actual results.…”

Section: Introductionmentioning

confidence: 99%

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Optimization for Mix Proportion of Reactive Powder Concrete Containing Phosphorous Slag by Using Packing Model

Peng

Liu

et al. 2020

ACT

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A mix-design method based on packing model was used to optimize the mix proportion of Reactive Powder Concrete (RPC) containing phosphorous slag in this paper. The design aimed to achieve a densely compacted matrix by applying the modified Andreasen particle packing model, i.e., the Dinger-Funk particle size distribution (PSD) equation. MAT-LAB and Excel Solver Tool were utilized to implement the calculation of the design with four steps. The outcome of the design was quite similar to another two results obtained respectively through the method for minimum water demand of paste and through the orthogonal design for mix proportion of RPC. According to these three mix proportions, RPC specimens with volume fraction of steel fiber of 1% were produced after they had been cured in 95°C steam for 72 hours. Their compressive and flexural strength are more than 180 MPa and 28 MPa, respectively. Microstructural investigation of specimens through mercury intrusion porosimetry and scanning electron microscopy confirms the very low porosity and quite compact microstructure of the RPC.

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Compaction-interaction packing model: regarding the effect of fillers in concrete mixture design

Cited by 66 publications

References 8 publications

Particle packing of cement and silica fume in pastes using an analytical model

Particle packing of cement and silica fume in pastes using an analytical model

Modeling of minimum void ratio for sand–silt mixtures

Optimization for Mix Proportion of Reactive Powder Concrete Containing Phosphorous Slag by Using Packing Model

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