Mechanical, microstructure and rheological characteristics of high performance self-compacting cement pastes and concrete containing ground clay bricks

Heikal, Mohamed; Zohdy, K.M.; Abdelkreem, Maha

doi:10.1016/j.conbuildmat.2012.07.114

Cited by 83 publications

(50 citation statements)

References 27 publications

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“…This result meets the previous studies of Heikal, M., et al (2012), the presence of super plasticizer in SCC gives the settings of denser microstructure and Calcium Silicate Hydrates micro crystals (CSH) as the main products of hydration and calcium hydroxide (CH) as the optional product.…”

Section: Fig 2 Compressive Strength Ratio Of Sccsupporting

confidence: 74%

“…The compressive test results that mixing seawater specimens were stronger than mixing distilled water specimens. Heikal, M. et al (2012), the presence super plasticizer in Self Compacting Concrete make the microstructure displayed are dense arrangement structure of microcrystalline CSH as the main hydration products with sheets of Ca(OH)2 as shown in the micrograph.…”

Section: Introductionmentioning

confidence: 99%

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Microstructure Characteristic and Compressive Strength of Self Compacting Concrete Using Sea Water as Mixing Water

Erniati¹,

Tjaronge²,

Djamaluddin³

et al. 2018

Preprint

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Indonesia is an archipelagic country which makes many areas doesn't have qualified water as drinking water. As concrete construction building in the region has possibly minimum or non-existent amount of fresh water, the using of sea water in mixing concrete and curing concrete is unavoidable. The demand of water is getting more and more increasing in both the improvement of infrastructure development and the life need. In the concrete industry, several billion tons of water is used as water mixing, curing and cleaning every year. Therefore the use of seawater is not allowed. In fact, we know that seawater is one of the abundant natural resources. Due to this problem, the research on the use of seawater is very important owing to the saving of freshwater is seriously needed. This study uses seawater by combining effective and efficient concrete technology of Self Compacting Concrete (SCC). This paper is a part of ongoing research studying about microstructure characteristics and the strength of SCC using seawater. It discusses about the compressive strength, absorption and porosity as microstructure characteristics of SCC until the age of 28 days. The results are: (1) the seawater used as mixing water did not affect the development of the compressive strength of concrete, (2) the difference compressive strength of SCC-SS with SCC-FF at an early age is very high occurred at ages 1 and 3 days and (3). The higher the compressive strength value is, the smaller the absorption and porosity is in concrete.

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Section: Fig 2 Compressive Strength Ratio Of Sccsupporting

confidence: 74%

Section: Introductionmentioning

confidence: 99%

Microstructure Characteristic and Compressive Strength of Self Compacting Concrete Using Sea Water as Mixing Water

Erniati¹,

Tjaronge²,

Djamaluddin³

et al. 2018

Preprint

View full text Add to dashboard Cite

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“…A utilização de sílica ativa, devido a sua atividade pozolânica, na composição dos concretos leves estruturais desta pesquisa, além de evitar o fenômeno de segregação, também auxiliaram na redução da espessura da zona de transição, fato também observado por Heikal et al [38], Mohammed et al [39] e Duan et al [40], que ressaltam, ainda, que as adições minerais proporcionam um arranjamento mais denso das partí-culas microcristalinas presentes nos concretos, aumentando, assim, a resistência mecânica e durabilidade.…”

Section: Microestrutura -Análise Da Ztiunclassified

Uso da argila expandida e sílica ativa no melhoramento dos desempenhos mecânicos, físicos e térmicos de concretos leves estruturais

2018

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A busca por materiais sustentáveis na construção civil, que apresentem menor massa específica, melhores desempenhos térmicos e manutenção das resistências mecânicas, representa grande desafio na produção e avaliação de concretos leves estruturais (CLE), o qual desponta como um material alternativo ao concreto convencional. Neste estudo realizou-se uma investigação para a confecção de concretos com alta resistência, baixa densidade e excelente desempenho térmico, com a finalidade de executar construções energeticamente eficientes. CLE foram estudados utilizando duas granulometrias de argila expandida (C 05 e C 15 ), onde houve a substituição do agregado graúdo pela C 15 em 0, 25, 50, 75 e 100%. Para promover a manutenção da consistência e resistência, utilizaram-se superplastificante (SPA) e sílica ativa (SA) nas misturas. Com base na metodologia utilizada, os concretos foram caracterizados física e mecanicamente, de acordo com as normas nacionais e internacionais vigentes. A densidade dos concretos, no estado endurecido, variou de 1.787 a 2.400 kg/m³ e, quanto a resistência à compressão, variou-se de 26 a 53 MPa, aos 7 dias de idade. O ensaio de condutividade térmica, por meio do método da placa quente protegida, foi realizado de acordo com a EN 12667, onde observou-se uma variação de 0,61 a 1,00 W/mK. Informações microestruturais da zona de transição interfacial (ZTI) entre agregado e matriz de cimento foram obtidas com a finalidade de analisar a relação com a resistência mecânica. A investigação revelou que, com a adição de argila expandida (C 05 e C 15 ) e SA nos concretos, houve a redução da densidade e da resistência mecânica, entretanto as características térmicas foram melhoras. Palavras-chave: materiais alternativos, concreto leve estrutural, densidade, resistência mecânica, condutividade térmica. ABSTRACTThe search for sustainable materials in civil construction, which presents a lower specific mass, better thermal performance and maintenance of mechanical resistance, represents a great challenge in the production and evaluation of structural lightweight concrete (SLC), which emerges as an alternative material to conventional concrete. In this study an investigation was carried out for the construction of concretes with high strength, low density and excellent thermal properties, in order to execute energy-efficient constructions. SLC were studied using two different granulometries of expanded clay (C 05 and C 15 ), where the coarse aggregate was replaced by C 15 at 0, 25, 50, 75 and 100%. To promote the maintenance of consistency and resistance, superplasticizer (SPA) and silica fume (SF) were used in the mixtures. Based on the methodology used, the concretes were physically and mechanically characterized, in accordance with current national and international standards. The density of the concretes, in the hardened state, ranged from 1,787 to 2,400 kg/m³ and, for compressive strength, ranged from 26 to 53 MPa at 7 days of age. The thermal conductivity test, using the protected hot plate method, was per...

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“…The results of compressive strength test specimens were stronger mixing of sea water mixing distilled water specimens. By Heikal, M. et al [9], have researched SCC and concluded that the presence of SCC Super plasticizer in concrete, becomes more solid microcrystalline tobermorite (3CaO. 2SiO 2 .…”

Section: Introductionmentioning

confidence: 99%

Microstructure Characteristics of Self Compacting Concrete using Sea Water

Erniati¹,

Tjaronge²,

Djamaluddin³

et al. 2018

Preprint

View full text Add to dashboard Cite

In the cycle of life, the needs of fresh water more and more. Infrastructure development is increasing. On the concrete industry, several billion tones of water used in earth as mixing water, treatment water (curing) and cleaner water every year, where using of sea water is obstructed. For that, the using of sea water which consists of 97% of the total water on earth is absolutely necessary.Self-compacting concrete (SCC) has dense microstructure. Knowledge about the microstructure and properties of each component a concrete and their relationship is useful to control the behavior. This research aims to know the relationship between compressive strength and microstructure characteristics of Self Compacting Concrete which using sea water up to the age of 90 days. The results of this study were the compressive strength of SCC using sea water is higher than the SCC using fresh water. Sea water does not reduce the strength of SCC concrete until the age of 90 days, but instead of Seawater is accelerating the development of SCC concrete strength at early age. Compressive strength of concrete SCC is influenced by the phase microstructure (especially with tobermorite and portladite) formed in the concrete. 18088Erniati et al

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Mechanical, microstructure and rheological characteristics of high performance self-compacting cement pastes and concrete containing ground clay bricks

Cited by 83 publications

References 27 publications

Microstructure Characteristic and Compressive Strength of Self Compacting Concrete Using Sea Water as Mixing Water

Microstructure Characteristic and Compressive Strength of Self Compacting Concrete Using Sea Water as Mixing Water

Uso da argila expandida e sílica ativa no melhoramento dos desempenhos mecânicos, físicos e térmicos de concretos leves estruturais

Microstructure Characteristics of Self Compacting Concrete using Sea Water

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