Saturation Point of Superplasticizers Determined by Rheological Tests for Self Compacting Concrete

Oualit, Mehena; Irekti, Amar; Mélinge, Yannick

doi:10.3311/ppci.11247

Cited by 4 publications

(5 citation statements)

References 8 publications

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“…The above-stated reduced concrete strength with the increased superplasticizer dosages is related to the segregation and bleeding of the fresh concrete. In SCC, the effectiveness of high-efficiency superplasticizer would not continue to exceed the saturation dosage (Manomi et al, 2018;Oualit et al, 2018), i.e., when the dose exceeded the saturated point, continuously adding high-efficiency superplasticizer would not improve the fluidity of cement paste or fresh concrete but delay the setting time of cement (Aicha, 2020) and lead to segregation and bleeding of fresh SCC (Mazloom et al, 2018). For the Self-compacting concrete S9W45SF0, S11W45SF0, S13W45SF0 and S15W45SF0 with the same water-to-cement ratio 0.45 and the corresponding superplasticizer dosages 0.4%, 0.8%, 1.2% and 1.6%, respectively, no bleeding was observed in S9W45SF0 and S11W45SF0 fresh concrete, while bleeding tendency was shown in S13W45SF0 fresh concrete and segregation, bleeding tendency was observed in S15W45SF0 fresh concrete.…”

Section: Self-compacting Concretementioning

confidence: 99%

Effect of Dose and Types of the Water Reducing Admixtures and Superplasticizers on Concrete Strength and Durability Behaviour: A Review

Wang,

Fang,

Zheng

2024

Journal of Civil Engineering and Management

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As one of the concrete admixtures, water reducing admixtures and superplasticizers are usually used to reduce the mixing water volume and improve the performance of the harden concrete while maintaining better workability of the fresh concrete. However, the concrete strength and durability properties are affected differently by different types and dosages of the water reducing admixtures and superplasticizers. Based on the published literatures, this paper comprehensively reviews and analyzes this problem. Different types of the concretes, including ordinary Portland cement concrete, ordinary Portland cement concrete containing pozzolan, fly ash and ground granulated blast furnace slag, calcium sulfoaluminate cement concrete, ferrite aluminate cement concrete, recycled aggregates concrete, lightweight aggregate concrete, self-compacting concrete and ultra-high performance concrete, are considered to discuss the influence of types and dosages of the water reducing admixtures and superplasticizers on their strengths. Water absorption, frost resistance and permeability resistance of the concrete are mainly reviewed to discuss this influence on the durability properties of the concrete. Then, some suggestions on the application of the water reducing admixtures and superplasticizers in reinforced concrete structures and projects are proposed.

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Section: Self-compacting Concretementioning

confidence: 99%

Effect of Dose and Types of the Water Reducing Admixtures and Superplasticizers on Concrete Strength and Durability Behaviour: A Review

Wang,

Fang,

Zheng

2024

Journal of Civil Engineering and Management

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“…As viscosidades plásticas são mínimas para as composições produzidas com o aditivo do fabricante C (Figura 14). Comportamento semelhante foi identificado por ERZENGIN et al [27] LI et al [59] e em argamassas e por OUALIT et al [60] na avaliação de pastas cimentícias. O incremento do teor de aditivo até a dosagem de saturação ocasionou a redução da viscosidade plástica e tixotropia das pastas e a tendência inversa observada para os espalhamentos.…”

Section: Influência Do Aditivounclassified

Avaliação reológica sob diferentes temperaturas de pastas cimentícias aditivadas com diferentes tipos de aditivos superplastificantes à base de policarboxilatos

2020

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RESUMO O estudo dos parâmetros reológicos das pastas cimentícias pode fornecer informações importantes sobre o desempenho dos concretos frescos nos quais elas serão aplicadas. Nesse contexto, este trabalho visa estudar os efeitos da temperatura nos parâmetros reológicos de pastas cimentícias aditivadas com superplastificantes. Também é abordada a análise do efeito do tipo de cimento, bem como o estudo da ação de superplastificantes à base de policarboxilato considerando sua função e os seus teores na mistura. As pastas foram avaliadas pelo ensaio de mini-abatimento e os parâmetros de tensão de escoamento, viscosidade plástica e indicador de tixotropia foram estimados a partir do ensaio de reometria rotacional e aplicação dos modelos de fluidos de Bingham e Herschel-Bulkley. Os resultados indicaram que o aumento da temperatura levou a uma redução das tensões de escoamento, viscosidades plásticas e tixotropia das pastas. Efeito semelhante ocorreu após o incremento do teor de aditivo até a dosagem de saturação. Para as formulações com o aglomerante de maior teor de pozolana as tensões de escoamento e viscosidades plásticas foram superiores em até 80 e 70%, respectivamente. Os dados reológicos indicam que aditivos de diferentes funções (abertura, espalhamento e multifuncional), embora apresentem a mesma base, influenciam de forma distinta os parâmetros reológicos e plasticidade das pastas cimentícias.

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“…Rheological tests on cement can be used to study the effect of the changes in cement, type and dosage of admixtures, such as superplasticizers, on paste characteristics like yield stress and plastic viscosity [33][34][35][36][37]. The principle is to apply different shear rates to the cement paste in a viscometer and measure the corresponding shear stresses.…”

Section: Tests On Cementmentioning

confidence: 99%

Effect of Black Liquor from Date Palm on the Workability and Compressive Strength of Portland Cement and Concrete

Irekti

Oualit

Siahmed

et al. 2019

Advances in Materials Science

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Lignin is the second most abundant natural polymer. Due to the high content of carbon and hydrogen (C-H, C-C, C=O), it can be used as a potential dispersant for cement matrix. The objective of this study is to extract lignin from date palm and study its effect in the form of black liquor (BL) on the rheological and physic-mechanical properties of the cements and concrete. The lignin in black liquor form represents approximately 30 wt% dry weight of date palm. It is a heteropolymer composed primarily of methoxylated phenylpropylene alcohol monomeric units interconnected by a variety of stable carbon-carbon and carbon-oxygen-carbon (ether and esters) linkages. The results found show the positive effect on the workability of cement and concrete and confirms its dispersion effect by improving compressive strength of concrete during the early and the later ages of hydration.

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Saturation Point of Superplasticizers Determined by Rheological Tests for Self Compacting Concrete

Abstract: Abstract

Cited by 4 publications

References 8 publications

Effect of Dose and Types of the Water Reducing Admixtures and Superplasticizers on Concrete Strength and Durability Behaviour: A Review

Effect of Dose and Types of the Water Reducing Admixtures and Superplasticizers on Concrete Strength and Durability Behaviour: A Review

Avaliação reológica sob diferentes temperaturas de pastas cimentícias aditivadas com diferentes tipos de aditivos superplastificantes à base de policarboxilatos

Effect of Black Liquor from Date Palm on the Workability and Compressive Strength of Portland Cement and Concrete

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