Compatibility of superplasticizers with cements different in composition

Erdoğdu, Şakir

doi:10.1016/s0008-8846(00)00229-5

Cited by 47 publications

(34 citation statements)

References 5 publications

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“…The positive contribution of limestone admixture is mainly due to the acceleration of the process of hydration of cement by at youth ages, as well as reducing of the amount of water necessary to the reference consistency by using of superplasticizer. This behavior of limestone at youth ages has been confirmed by several authors [1,4,5,7,8] and can be influenced by the nature of cement and the superplasticizers used [5,6,8,[10][11][12][13][14].…”

Section: Iv31 Compressive Strengths At 07 Dayssupporting

confidence: 67%

“…This contribution to the compressive strengths at 28 days is at first due to the reducing of the amount of water in the mixture with the same consistency through the use of super-plasticizer SP [6,10]. The use of super-plasticizer may also contribute to improving the process of hydration of cement as confirmed by several studies [11][12][13][14]. These occurrences could result in a strength gain interest in the image of concrete without admixtures for which improved resistance can reach 12% for concrete B1-SP without admixtures.…”

Section: Matec Web Of Conferencesmentioning

confidence: 96%

“…These modifications depend on several parameters such as, the nature, quantity and fineness of the incorporated admixture, as well as nature of cements and super-plasticizers used [8][9][10][11][12][13][14]. In this study, the main objective is to evaluate the benefit of mineral admixtures and super-plasticizers on the fresh and hardened properties of concretes.…”

Section: Introductionmentioning

confidence: 99%

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Valorization of Local Mineral Admixtures in Concretes

Boudchicha

Gallias

2014

MATEC Web of Conferences

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Abstract:This study is an extension of previous researches on mortars with mineral admixtures and superplasticizers. In this way, the same methodology was applied to concretes and the use of mineral admixture was limited to low cost materials available in Algeria as limestone, pozzolan and blast furnace slag, with current cement and super-plasticizer. The experimental methodology used was based on the volume substitution of the cement by admixtures in mixtures with the absolute volume of the solid phases and workability preserved constant. The main results achieved showed that the super-plasticizer demand of concretes depends on the nature and the quantity of the incorporated admixture. The combined use of admixtures and super-plasticizer has generally a favourable effect on compressive strengths at 07 and 28 days at low rates of cement substitution, which vary significantly with the nature, fineness and quantity of the used admixtures. At 07 days, limestone admixtures give better improvements and reach more than 20 % of gain to the compressive strength of the reference concrete with no admixtures or super-plasticizer, at 10 % of the cement substitution and still better until 30 %. At 28 days, blast furnace slag admixtures give better improvements at 28 days and reach more than 20 % of gain to the compressive strength of the reference concrete at 20 % of the cement substitution and still better until 30 %. This contribution to the compressive strength is explained on the one hand by the reduction of the quantity of water in the mixtures at the same consistency, by the use of the super-plasticizer and on another hand by the activity of Limestone admixtures at early ages and to the latent hydraulic properties of blast furnace slag at 28 days.

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Section: Iv31 Compressive Strengths At 07 Dayssupporting

confidence: 67%

Section: Matec Web Of Conferencesmentioning

confidence: 96%

Section: Introductionmentioning

confidence: 99%

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Valorization of Local Mineral Admixtures in Concretes

Boudchicha

Gallias

2014

MATEC Web of Conferences

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“…Dessa maneira, os aditivos superplastificantes melhoram as propriedades do concreto nas primeiras idades sem promover qualquer efeito adverso para tempos mais longos, particularmente quando usado em misturas de concreto de alto desempenho [16].…”

Section: Aditivos Superplastificantesunclassified

Revisão: conceitos de dispersão e empacotamento de partículas para a produção de concretos especiais aplicados na construção civil

Castro

Pandolfelli

2009

Cerâmica

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INTRODUÇÃOOs concretos especiais atuais são mais do que uma simples mistura de cimento, água e agregados, pois freqüentemente contêm aditivos químicos e adições minerais que fornecem uma variedade de propriedades e características especiais ao material. Estes concretos também estão se tornando bastante complexos, uma vez que produtos minerais e amorfosalém do clínquer -interagem com moléculas orgânicas ou polímeros desenvolvidos especialmente para realçar certas propriedades ou para corrigir algumas deficiências dos cimentos existentes [1].Revisão: Conceitos de dispersão e empacotamento de partículas para a produção de concretos especiais aplicados na construção civil (Review: Concepts of particle dispersion and packing for special concretes production)A. L. de Castro, V. C. Pandolfelli Departamento de Engenharia de Materiais -DEMa, Universidade Federal de S. Carlos, Rod. Washington Luiz, km 235, S. Carlos, SP 13565-905 alelorencastro@yahoo.com.br, vicpando@power.ufscar.br Resumo O concreto material de construção mais amplamente utilizado está constantemente evoluindo. Nos últimos anos, muitas pesquisas têm sido desenvolvidas e a busca por materiais com desempenho mecânico e de durabilidade cada vez maiores tem sido o alvo dos pesquisadores da tecnologia dos concretos. Tais materiais permitem que os projetistas e arquitetos o usem eficientemente em edifícios altos, além de serem esteticamente mais interessantes. Para tanto, concretos obtidos a partir da engenharia de microestrutura são necessários. Por serem compósitos constituídos de partículas com granulometria fina (tamanho máximo ≤ 4750 µm) e uma baixa relação água/cimento, esses concretos apresentam matrizes densas obtidas a partir da otimização do empacotamento dos materiais granulares, enquanto a trabalhabilidade adequada é obtida com a dispersão das partículas promovida pela incorporação de aditivos químicos à mistura. Além disso, utilizam adições minerais que são, na grande maioria, subprodutos industriais, resultando em um grande benefício ambiental: reciclagem de resíduos industriais, redução de emissões poluidoras durante a produção do cimento, preservação de matérias-primas e economia de energia. Assim, no presente artigo, uma revisão sobre os conceitos de dispersão e empacotamento de partículas foi realizada, direcionando-se para os concretos especiais aplicados na construção civil. Palavras-chave: engenharia de microestrutura, dispersão e empacotamento de partículas, concretos especiais. Abstract Concrete

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“…Chemical additives such as water-reducing superplasticizers can also contribute to the aggregate-matrix ITZ region. By acting directly on the cement particles, additives enable the reduction of the amount of water in the system, maintaining the consistency index and contributing to the decrease of voids [18][19][20] . The simple treatment of the coarse aggregate used in concrete enables alterations in the aggregate-matrix ITZ.…”

Section: Introductionmentioning

confidence: 99%

Doping technique in the interfacial transition zone between paste and lateritic aggregate for the production of structural concretes

Trigo¹,

Libório

2013

Mat. Res.

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This paper discusses the use of doping technique in the interfacial transition zone (ITZ) between Portland cement paste and lateritic aggregates with the objective of promoting the implementation of structural concrete. Doping technique consists of establishing the initial impregnation of the aggregate with a high performance paste in order to improve its binding to the matrix. A Scanning Electron Microscope (SEM) equipped with an energy dispersive X-ray (EDX) analysis system is used to observe the results of the technique in the ITZ. The results are observed through an analysis of the cement hydration products formed in the ITZ. An ITZ with high concentration of large crystals of calcium hydroxide (CH) is observed in plain concrete, whereas in concrete prepared with doping technique the ITZ is rich in calcium silicate hydrate (CSH). This result confirms the possibility of using this material, which has no commercial value nowadays, as an alternative aggregate for elaborating structural concrete.

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Compatibility of superplasticizers with cements different in composition

Cited by 47 publications

References 5 publications

Valorization of Local Mineral Admixtures in Concretes

Valorization of Local Mineral Admixtures in Concretes

Revisão: conceitos de dispersão e empacotamento de partículas para a produção de concretos especiais aplicados na construção civil

Doping technique in the interfacial transition zone between paste and lateritic aggregate for the production of structural concretes

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