From mini-cone test to Abrams cone test: measurement of cement-based materials yield stress using slump tests

Roussel, Nicolas; Stefani, C.; Leroy, René

doi:10.1016/j.cemconres.2004.07.032

Cited by 342 publications

(140 citation statements)

References 9 publications

Supporting

Mentioning

102

Contrasting

Unclassified

Order By: Relevance

“…In the concrete industry, the yield stress is very important since it determines whether air bubbles will rise to the surface or remain trapped in the wet cement and weaken the resulting hardened material. Consequently, a large number of tests have been developed to determine the yield stress of cement and similar materials (Asaga & Roy 1980;Tremblay et al 2001;Roussel et al 2005). However, the different tests often give very different results and even in controlled rheology experiments the same problem is well documented: depending on the measurement geometry and the detailed experimental protocol, very different values of the yield stress can be found (James et al 1987;Nguyen & Boger 1992;Barnes 1997Barnes , 1999Barnes & Nguyen 2001).…”

Section: Introduction: the Yield Stress Problemmentioning

confidence: 99%

An attempt to categorize yield stress fluid behaviour

Møller

Fall

Chikkadi

et al. 2009

Phil. Trans. R. Soc. A.

243

208

View full text Add to dashboard Cite

We propose a new view on yield stress materials. Dense suspensions and many other materials have a yield stress-they flow only if a large enough shear stress is exerted on them. There has been an ongoing debate in the literature on whether true yield stress fluids exist, and even whether the concept is useful. This is mainly due to the experimental difficulties in determining the yield stress. We show that most if not all of these difficulties disappear when a clear distinction is made between two types of yield stress fluids: thixotropic and simple ones. For the former, adequate experimental protocols need to be employed that take into account the time evolution of these materials: ageing and shear rejuvenation. This solves the problem of experimental determination of the yield stress. Also, we show that true yield stress materials indeed exist, and in addition, we account for shear banding that is generically observed in yield stress fluids.

show abstract

Section: Introduction: the Yield Stress Problemmentioning

confidence: 99%

An attempt to categorize yield stress fluid behaviour

Møller

Fall

Chikkadi

et al. 2009

Phil. Trans. R. Soc. A.

243

208

View full text Add to dashboard Cite

show abstract

“…2 could systematically overestimate the results compared with those measured by the viscometer. However, Roussel et al [27] reported that the surface tension effect in the mini-slump test is negligible in pastes with yield stresses larger than about 1 Pa, which is the case for all pastes studied here.…”

Section: The Influences Of MIX Design Parametersmentioning

confidence: 91%

“…This could be attributed to the fact that the effect of the surface tension of the paste was not included in Eq. 2; this would normally be of the same order as the yield stress (1-2 Pa) for low concentration suspensions [27]. The neglect of surface tension effects in the calculation of yield stress using Eq.…”

Section: The Influences Of MIX Design Parametersmentioning

confidence: 99%

Reproducible mini-slump test procedure for measuring the yield stress of cementitious pastes

2017

View full text Add to dashboard Cite

The mini-slump test is a fast, inexpensive and widely adopted method for evaluating the workability of fresh cementitious pastes. However, this method lacks a standardised procedure for its experimental implementation, which is crucial to guarantee reproducibility and reliability of the test results. This study investigates and proposes a guideline procedure for mini-slump testing, focusing on the influence of key experimental (mixing and testing) parameters on the statistical performance of the results. The importance of preparation of always testing at the same time after mixing, testing each batch once rather than conducting multiple tests on a single batch of material, is highlighted. A set of alkali-activated fly ash-slag pastes, spanning from 1 to 75 Pa yield stresses, were used to validate the test method, by comparison of calculated yield stresses with the results obtained using a conventional vane viscometer. The proposed experimental procedure for mini-slump testing produces highly reproducible results, and the yield stress calculated from mini-slump values correlate very well with those measured by viscometer, in the case of fresh paste of pure shear flow. Mini-slump testing is a reliable method that can be utilised for the assessment of workability of cements.

show abstract

“…Dessa forma, existem estudos que mensuram os parâmetros reológicos por meio de um reômetro para concreto [51][52][53], outros estudos medem os parâmetros reológicos da argamassa que compõe o concreto [35,36,55] e, por fim, existem modelos matemáticos que estimam os parâmetros reológicos da argamassa e do concreto por meio de parâmetros de autoadensabilidade [20,56,57].…”

Section: Aspectos Relevantes De Autoadensabilidade E De Reologia De Aunclassified

Avaliação dos parâmetros de autoadensabilidade e de reologia do concreto autoadensável

2017

View full text Add to dashboard Cite

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...

show abstract

From mini-cone test to Abrams cone test: measurement of cement-based materials yield stress using slump tests

Cited by 342 publications

References 9 publications

An attempt to categorize yield stress fluid behaviour

An attempt to categorize yield stress fluid behaviour

Reproducible mini-slump test procedure for measuring the yield stress of cementitious pastes

Avaliação dos parâmetros de autoadensabilidade e de reologia do concreto autoadensável

Contact Info

Product

Resources

About