A study of effects of aggregate on concrete rheology

Hu, Jiong

doi:10.31274/rtd-180813-15380

Cited by 22 publications

(31 citation statements)

References 73 publications

(130 reference statements)

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“…To achieve a proper flow, the aggregate surface in a mortar needs to be covered with a certain thickness of cement paste. Table 3 provides the calculated excess paste thickness of mortar mixes made with different type and size of aggregate for s/c=1 and w/c=0.40 (Hu 2005). It can be observed from the table that the excess paste thickness decreases with reduced size and fineness modulus of the fine aggregate in the mortar.…”

Section: Effect Of Aggregate Sizementioning

confidence: 99%

Effects of Size and Uncompacted Voids of Aggregate on Mortar Flow Ability

Wang

2007

ACT

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The effects of aggregate characteristics on the flow ability of mortar mixtures were investigated. Two types, five singlesized and three graded fine aggregate were considered. Uncompacted voids of the aggregates were measured. Flow properties of 166 mortar batches made with different aggregates, sand-to-cement ratios (s/c) and water-to-cement ratios (w/c), were evaluated using the modified ASTM C109 flow table test method. The results indicated that in addition to w/c, the content, uncompacted voids, and size of aggregate all significantly affect mortar flow ability. Generally, aggregate having higher uncompacted void content provides its mortar with a lower flow. When aggregate content was low (s/c = 1), aggregate size had little effect on the flow ability of the mortar; when aggregate content was high (s/c = 3), aggregate size significantly influenced the mortar flow ability. The mortar with graded aggregate has better flow ability than the mortar with single-sized particles. River sand provides a mortar with better flow ability when compared to limestone. A statistical model was developed to predict the flow ability of mortar. The model can also be used to study the effect of different parameters on mortar flow properties.

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Section: Effect Of Aggregate Sizementioning

confidence: 99%

Effects of Size and Uncompacted Voids of Aggregate on Mortar Flow Ability

Wang

2007

ACT

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“…Several authors [20][21][22] have also observed this phenomenon, where it is noted that paste volume is inversely proportional to the viscosity of the mixture. When enough fly ash is replaced in the mixture, paste volume increases due to the lower density of fly ash compared to cement, which can form a lubricating layer between sand particles to reduce friction and increase flowability of mixtures [23].…”

Section: Resultsmentioning

confidence: 85%

Effect of sand, fly ash, and coarse aggregate gradation on preplaced aggregate concrete studied through factorial design

Coo

Pheeraphan²

2015

Construction and Building Materials

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“…Alguns trabalhos [6,33,39] apontam para uma influência do coeficiente de atrito dos agregados no comportamento de concretos no estado fresco. Cabe salientar, no entanto, que as argamassas se comportam de forma diferente dos concretos, seja pela quantidade de agregados, seja pela interação dos agregados graú-dos (inexistentes na argamassa) com os miúdos.…”

Section: Figura 13unclassified

“…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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A study of effects of aggregate on concrete rheology

Cited by 22 publications

References 73 publications

Effects of Size and Uncompacted Voids of Aggregate on Mortar Flow Ability

Effects of Size and Uncompacted Voids of Aggregate on Mortar Flow Ability

Effect of sand, fly ash, and coarse aggregate gradation on preplaced aggregate concrete studied through factorial design

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

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