Methodology for the mix design of self-compacting concrete using different mineral additions in binary blends of powders

Nepomuceno, Miguel; Oliveira, Luiz António Pereira de; Lopes, Sérgio M.R.

doi:10.1016/j.conbuildmat.2014.04.021

Cited by 68 publications

(31 citation statements)

References 18 publications

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“…It is also noted that the concretes having a ratio G / GT = 0.48 give slightly higher compressive strengths. The compressive and tensile strength results give values similar to those published by other research carried out on self-placing concrete [29][30][31].…”

Section: B) Tests On Hardened Sccsupporting

confidence: 79%

Use of Fillers for Optimal Formulation of Self-Compacting Concretes

Noufid¹,

Belattar²

2018

CivileJournal

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The objective of this study is to achieve an optimal formulation of self-compacting concrete using local materials from the country of Morocco, the use of this type of concrete remains very limited compared to a concrete vibrated in this country, due to lack mastery by companies. We will therefore try to study an optimal formulation that respects European standards and gives comparable results, even improved, to those of vibrated concrete, in order to be able to replace vibrated concrete with self-compacting concrete in construction sites. Thus, SCC mixtures containing amounts of fillers were examined, and with different Portland cement dosages: 350; 375 and 400 kg/m 3 . The method of formulation is made in accordance with French regulations. The results obtained were compared to these vibrated concrete counterparts containing the same cement dosages. Tests include compression, traction and flexion tests at 3, 7 and 28 days of age. Several studies have been carried out internationally, but at the national level, there is no study to this effect. The results obtained show that there is an improvement in the strength of concrete, in addition to the liquid appearance of concrete. It is this last aspect that characterizes the SCC, which allows it a flow in the areas inaccessible by the vibrator, thus saving time and performance of the structure to achieve.

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Section: B) Tests On Hardened Sccsupporting

confidence: 79%

Use of Fillers for Optimal Formulation of Self-Compacting Concretes

Noufid¹,

Belattar²

2018

CivileJournal

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“…-Considerou-se argamassas com espalhamento entre 230mm a 330mm e tempo de fluidez de até 10 segundos, conforme os valores encontrados por NEPOMUCENO et al [54]; -Com relação a estabilidade no estado fresco, considerou-se as argamassas coesas e iminentes para exsudar e segregar, como ilustra a Figura 3.…”

Section: Estudos Em Argamassasunclassified

“…No entanto, os valores encontrados no presente estudo estão fora da região dos valores encontrados por NEPOMUCENO et al [54], que sugere intervalos bem estreitos, como a área relativa de espalhamento entre 5,30 e 5,90 e velocidade de relativa de fluidez entre 1,14 s -1 e 1,30 s -1 .…”

Section: Autoadensabilidade Das Argamassas Dos Concretosunclassified

“…CHAI [69] adotou, por exemplo, uma relação de volume de areia e volume de argamassa (Vs/Vm) maior que 0,45 para as misturas de relação água/aglomerante superior a 0,34, portanto corroborando com o valor médio adotado nesta pesquisa que foi 0,48. Entretanto, NEPOMUCENO et al [54] empregaram a relação Vs/Vm em torno de 0,40; a qual também foi empregada por OUCHI e OKAMURA [1] e considerada por CHAI [69] uma relação muito baixa para um consumo de aglomerante recomendado pelo ACI. Quanto menor a relação de Vs/Vm, isso implica em um maior emprego de finos na mistura.…”

Section: Figuraunclassified

“…Quanto menor a relação de Vs/Vm, isso implica em um maior emprego de finos na mistura. A relação entre os volumes de finos e de areia (Vp/Vs) empregada por NEPOMUCENO et al [54] em suas argamassas autoadensáveis foi entre 0,60 e 0,80, enquanto que neste trabalho empregou-se um valor em torno de 0,40. Essa diferença entre os valores empregados de Vp/Vs, pode explicar a disparidade dos valores de autoadensabilidade das argamassas desta pesquisa com os valores de autoadensabilidade das argamassas de NEPOMUCENO et al [54], conforme estão apresentados na Figura 9.…”

Section: Figuraunclassified

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Avaliação dos parâmetros de autoadensabilidade e de reologia do concreto autoadensável

2017

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RESUMOO concreto autoadensável é de complexa obtenção, por isso exige-se um estudo minucioso da mistura e do seu comportamento no estado fresco. De acordo com os requisitos de autoadensabilidade exigidos pela norma brasileira ABNT NBR 15823-1, decidiu-se obter parâmetros de autoadensabilidade e de reologia por meio de estudos em argamassas e, posteriormente, estudos em concretos. Os parâmetros decorrentes da avaliação das argamassas foram obtidos por meio dos seguintes ensaios: mini-slump, mini-funil e caracterização reológica por meio do reômetro da marca Rheotest N4.1. Os parâmetros provenientes da avaliação dos concretos foram obtidos por meio dos ensaios e modelos matemáticos: slump flow, T500, funil V, anel J, caixa L, caixa U, tubo de segregação, parâmetros reológicos estimados por meio de equações matemáticas propostas por Sedran e De Larrard. Com esses parâmetros, foi possível parametrizar ou mapear os concretos autoadensáveis com vistas na norma NBR 15823, bem como foi feita uma avaliação do emprego da classificação dessa norma para o concreto autoadensável. Constatou-se, por exemplo, que o ensaio T500 não apresentou resultados consistentes de viscosidade plástica aparente quando comparados com os resultados do ensaio de Funil V para esta mesma característica. Verificou-se que os ensaios que avaliam habilidade passante, tais como, caixa L e anel J não demonstraram uma boa relação entre seus resultados, assim podendo comprometer a classificação do concreto como autoadensável. Por fim, de maneira geral, observou-se uma importante relação dos parâmetros de autoadensabilidade e de reologia de argamassas e de concretos e, além disso, despertou-se no sentido de melhor avaliar a autoadensabilidade do concreto diante de algumas inconsistências nos resultados de alguns ensaios.Palavras-chave: concreto autoadensável, argamassa, habilidade passante, capacidade passante, resistência à segregação. ABSTRACTThe design of self-compacting concrete is complex, so it requires a thorough study of the mixture and their behavior in the fresh state. According to workability requirements required by the Brazilian standard NBR 15823-1, we decided to get workability parameters and rheology through studies in mortars, and later studies in concrete. The parameters resulting from the evaluation of the mortars were obtained by means of the following tests: mini-slump, mini funnel and rheological characterization using the rheometer of Rheotest N4.1 brand. The parameters resulting from the evaluation of concrete were obtained through the tests and mathematical models: slump flow, T500, V funnel, J ring, L box, U box, segregation tube, rheological parameters estimated by mathematical equations proposed by Sedran and De Larrard. From these parameters, it was possible to parameterize or map the self-compacting concrete according NBR 15823-1, and an assessment was made of the use of this classification standard for self-compacting concrete. It was found, for example, that the T500 test results showed no apparent consistent plastic viscos...

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An overview on mixture design of self‐compacting concrete

Ashish

Verma

2018

Structural Concrete

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Self-compacting concrete (SCC) was developed in 1988 and introduced by Professor H. Okamura to achieve durability of structures with low skilled laborers. The three properties of SCC that differentiates it from traditional concrete are passing ability, filling ability and segregation resistance. The present study highlights the developments concerning SCC in the period from 1995 to 2017. This information is important for researchers and professionals working in this area. SCC can be optimized to a larger extent to find the best alternative either by use of additives or tailor-made mix design. Based on different principles and parameters, design methods can be categorized into six classes namely empirical design method, statistical factorial design method, strength-based design method, rheology of paste method, particle packing method and Eco-SCC mixture design method. To develop SCC with high quality a suitable method can be chosen depending upon the situation and application.compressive strength, design mixture method, empirical, particle packing method, rheology of paste method, self-compacting concrete 1 | INTRODUCTION SCC flows into every corner of a mold, passes reinforcement and fill gaps without any need of internal or external vibration and compaction simultaneously maintaining stability without segregation and bleeding of concrete. It has the ability to compact itself only by means of its own weight. [1][2][3][4] In the early 1990s, SCC was introduced in concrete technology. 5 The properties of SCC depend on the source and the type of constituent materials and their properties. 6 The use of SCC eliminates the compacting effort and this results in reduced costs of placement, moreover, a decrease in the duration of construction improves productivity. 7 SCC is a concrete type with high workability, a high flowability and superior resistance to segregation. 8 The property of SCC to completely fill a formwork by filling gaps and to flow around reinforcement without the need of vibration or bleeding makes it significant to use. 9 A good balance between deformability and stability resulted in the successful development of SCC. Different mix design procedures were proposed for SCC that include (a) combinations of a higher volume of mineral additives and water-reducing admixture, (b) combination of water-reducing admixture and viscosity modifying agent. 10 The use of SCC reduces the noise during casting and provides better working conditions. 7,11 The applications of SCC in densely reinforced sections, that is, columns and beams in moment-resisting frames in seismic areas is necessary to ensure that all gaps in a formwork are filled. 7 The use of limestone powder as a fine additive can improve the rheological behavior of cement pastes and the combination of both limestone powder and fly ash can result in a higher packing density. 12 Eco-SCC is a SCC with a maximum total binder content of 315 kg/m 3 which can include cement, silica fume, fly ash and/or limestone filler. 13 Air-entrained SCC was designed with the u...

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Methodology for the mix design of self-compacting concrete using different mineral additions in binary blends of powders

Cited by 68 publications

References 18 publications

Use of Fillers for Optimal Formulation of Self-Compacting Concretes

Use of Fillers for Optimal Formulation of Self-Compacting Concretes

Avaliação dos parâmetros de autoadensabilidade e de reologia do concreto autoadensável

An overview on mixture design of self‐compacting concrete

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