Influence of fine aggregate characteristics on the rheological properties of mortars

Westerholm, Mikael; Lagerblad, Björn; Silfwerbrand, Johan; Forssberg, Eric

doi:10.1016/j.cemconcomp.2007.08.008

Cited by 236 publications

(103 citation statements)

References 5 publications

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“…It is noted that the shear strength of the mortars with the finest sands (S4 and C4) is similar indicating that the influence of shape and texture is minimised as the "paste" content of the mortar is increased. Westerholm et al [25] have reported similar findings. At its simplest mortar may be considered as coarser sand particles suspended in a paste matrix.…”

Section: Mortar Production and Testingsupporting

confidence: 75%

“…As expected the flow decreases and the shear strength increases as the amount of fines increases from grading 1 to 4. However, this is accompanied by a decrease in viscosity; a similar phenomenon has been reported elsewhere [25]. Unfortunately, the viscometer did not respond to the stiffest mortar, C3, with the lowest flow.…”

Section: Mortar Production and Testingmentioning

confidence: 74%

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Influence of substrate and sand characteristics on Roman cement mortar performance

Starinieri

Hughes

Wilk

2015

Construction and Building Materials

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When formulating repair mortars standard test specimens should be used with caution as these cannot be considered representative of samples of mortars collected on site. This work reports an approach to repair mortar formulation which takes into account the influence of porous substrates, sand characteristics and mortar thickness on the properties of both fresh and hardened Roman cement mortars. It is shown that mortars cast on a dry absorbent substrate show modified properties such as increased strength and decreased water absorption coefficient, the degree of which is a function of sand grading and surface characteristics, sample thickness and substrate sorptivity.

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Section: Mortar Production and Testingsupporting

confidence: 75%

Section: Mortar Production and Testingmentioning

confidence: 74%

Influence of substrate and sand characteristics on Roman cement mortar performance

Starinieri

Hughes

Wilk

2015

Construction and Building Materials

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“…Vários trabalhos têm se dedicado ao estudo das areias oriundas de britagem de rocha nas propriedades das argamassas, como forma de contribuir para o uso corrente desse tipo de agregado na produção das argamassas de construção [5,6,7,8,9,10,11,12,13,14,15].…”

Section: Introductionunclassified

Parâmetros da areia que influenciam a consistência e a densidade de massa das argamassas de revestimento

Carasek

Araújo²,

Cascudo

et al. 2016

Matéria (Rio J.)

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RESUMOO consumo de areias de britagem para produção de argamassas vem aumentando, uma vez que as jazidas de areia natural estão cada vez mais escassas e que a exploração dessa areia gera grande impacto ambiental. Nesse sentido, o objetivo deste trabalho é verificar a influência do emprego de areias de britagem de diferentes origens e mineralogias nas propriedades de argamassas de revestimento no estado fresco. Com base em uma ampla caracterização de agregados originários de diferentes fontes litológicas, a pesquisa visou avaliar quais parâmetros da areia melhor explicam os comportamentos de consistência e de densidade de massa da argamassa. O estudo foi realizado com cinco areias, sendo uma areia natural e quatro de britagem oriundas de rochas de diferentes litologias (granito, dolomito, micaxisto e quartzito). Além da caracterização granulomé-trica e da determinação dos índices físicos das areias, foram realizadas análises morfoscópica e petrográfica, bem como a determinação do ângulo de atrito interno por meio do ensaio de cisalhamento direto. Para verificar o efeito das características das areias nas propriedades da argamassa no estado fresco, empregou-se uma mistura 1:1:6 (cimento:cal:areia, em volume), tendo-se realizados os ensaios de determinação do índice de consistência na mesa ABNT, penetração do cone e densidade de massa. As principais conclusões obtidas ressaltam que a porosidade (vazios entre partículas e grãos de areia) e a massa unitária da areia são os parâ-metros que melhor se correlacionam com a consistência e a densidade de massa das argamassas, o que é explicado pela alteração imposta no volume de pasta das argamassas devido ao volume de vazios deixado pelos grãos das areias.Palavras-chave: argamassa, areia, consistência, densidade de massa, massa unitária. ABSTRACTThe use of manufactured sands in the production of mortars has been increasing in the last years, since the natural sand deposits are becoming increasingly scarcers and the exploitation of sand generates high environmental impact. In this sense, the objective of this work is to verify the influence of manufactured sands from different origins and mineralogies on the properties of rendering mortars in the fresh state. Based on an extensive characterization of aggregates from different lithological sources, the research aimed to assess which sand parameters explain better the mortar behaviors of consistency and bulk density. The study was performed with five sands: one natural sand and four manufactured sands originated from rocks of different lithologies (granite, dolomite, mica-schist and quartzite). In addition to the particle size characterization and the determination of the physical indices of sands, a morphoscopic analysis and a petrographic analysis were also carried out as well as the determination of internal friction angle obtained from direct shear test, used for soils. To verify the interference of sand characteristics on the mortar properties in fresh state, it was employed a mix proportion 1: 1: 6 (Portland cement:lime...

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“…Even though they marginally satisfy the standard of aggregates, its poor quality causes difficulty in mix proportioning (Bairagi et al 1990;Goltermann and Johansen 1997). Also the physical properties of the aggregate affect the performance of concrete and especially dominate workability in its fresh state (Erdogan and Fowler 2005;Westerholm et al 2008;Nanthagopalan and Santhanam 2011;Wallevik and Wallevik 2011;Quiroga and Fowler 2004;Mahmoodzadeh and Chidiac 2013). Therefore, evaluating the aggregate effect on the viscosity of freshly mixed cementitious materials allows us to control and guide the selection of the proper type of aggregates.…”

Section: Introductionmentioning

confidence: 99%

Critical Grain Size of Fine Aggregates in the View of the Rheology of Mortar

Han

Kim

Lee

et al. 2017

Int J Concr Struct Mater

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The aim of this research was to investigate the validity of the Krieger-Dougherty model as a quantitative model to predict the viscosity of mortar depending on various aggregate sizes. The Krieger-Dougherty model reportedly predicted the viscosity of a suspension, which includes cement-based materials. Concrete or mortar incorporates natural resources, such as sand and gravel, referred to as aggregates, which can make up as much as 80% of the mixture by volume. Cement paste is a suspending medium at fresh state and then becomes a binder to link the aggregate after its hydration. Both the viscosity of the suspending medium and the characteristics of the aggregates, therefore, control the viscosity of the cement-based materials. In this research, various sizes and gradations of fine aggregate samples were prepared. Workability and rheological properties were measured using fresh-state mortar samples and incorporating the various-sized fine aggregates. Yield stress and viscosity measurements were obtained by using a rheometer. Based on the packing density of each fine aggregate sample, the viscosity of the mortar was predicted with the Krieger-Dougherty model. In addition, further adjustments were made to determine the water absorption of fine aggregates and was transferred from successful experiment to simulation for more accurate prediction. It was also determined that both yield stress and viscosity increase when the fine aggregate mean size decreases throughout the mix. However, when the mean size of the fine aggregates is bigger than 0.7 mm, the yield stress is not affected by the size of the fine aggregate. Additionally, if aggregate grains get smaller up to 0.3 mm, their water absorption is critical to the rheological behavior.

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Influence of fine aggregate characteristics on the rheological properties of mortars

Cited by 236 publications

References 5 publications

Influence of substrate and sand characteristics on Roman cement mortar performance

Influence of substrate and sand characteristics on Roman cement mortar performance

Parâmetros da areia que influenciam a consistência e a densidade de massa das argamassas de revestimento

Critical Grain Size of Fine Aggregates in the View of the Rheology of Mortar

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