Properties of seashell aggregate concrete: A review

Eziefula, Uchechi G.; Ezeh, John C.; Eziefula, Bennett I.

doi:10.1016/j.conbuildmat.2018.10.096

Cited by 148 publications

(96 citation statements)

References 27 publications

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“…Ground oyster shell has a comparable apparent volume to sand with higher permeability and has a specific gravity of around 2.0 [1]. Many attempts have been given to utilize the physical and chemical characteristics of the oyster shell to fabricate adsorbents for hazardous substances, water purifiers, soil remediation agents, fertilizers, and construction materials [1,4,5,6,7,8,9,10,11,12,13,14,15,16].…”

Section: Introductionmentioning

confidence: 99%

Calcined Oyster Shell Powder as an Expansive Additive in Cement Mortar

et al. 2019

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The present study prepared calcined oyster shell powder having chemical composition and crystal structure of calcium oxide and lime, respectively, and investigated the fresh and hardened properties of cement mortar incorporating calcined oyster shell powder as an additive. The test results indicated that the hydration of calcined oyster shell powder promoted the additional formation of Ca(OH)2 at the initial reaction stage, thereby increasing the heat of hydration. In particular, the volumetric increase of calcined oyster shell powder during hydration compensated the autogenous shrinkage of mortar at early ages, ultimately leading to a clear difference in the shrinkage values at final readings. However, an excessive incorporation of calcined oyster shell powder affected the rate of C–S–H formation in the acceleratory period of hydration, resulting in a decrease in the compressive strength development. Meanwhile, the degree of flow loss was inconsequential and rapid flow loss was not observed in the specimens with calcined oyster shell powder. Therefore, considering the fresh and hardened properties of cement mortar, the incorporation of calcined oyster shell powder of approximately 3% by weight of cement is recommended to enhance the properties of cement mortar in terms of compressive strength and autogenous shrinkage.

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Section: Introductionmentioning

confidence: 99%

Calcined Oyster Shell Powder as an Expansive Additive in Cement Mortar

et al. 2019

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“…Segundo EZIEFULA et al [20], no caso de conchas de ostras, tamanhos mais finos de partículas tendem a apresentar uma maior absorção de água, maior gravidade específica, maior densidade de partículas e menor módulo de finura do que partículas mais grosseiras. Quando comparadas com agregados naturais, a maioria das conchas possuem densidades específicas ligeiramente menores ou similares.…”

Section: Resíduos Na Produção Do Concretounclassified

“…Tais impurezas resultam em uma redução na trabalhabilidade e em menores resistências. Por conta disso, qualquer aplicação futura de sedimentos marinhos em concreto de alto desempenho provavelmente exigirá a adição de aditivos redutores de água ou superplastificantes, bem como demandará de uma limpeza e tratamento adequados desses materiais [20]. A presença desses compostos e impurezas pode ser realizada a partir de métodos de identificação de compostos químicos, como FRX, por exemplo.…”

Section: Resíduos Na Produção Do Concretounclassified

“…Diferentes estudos já avaliaram a aplicação desses resíduos como substituintes, tanto dos agregados miúdos e graúdos quanto de parcela do cimento. Como exemplo, podem-se citar resíduos de areia de fundição [4][5][6][7][8], resíduos de vidro e pó de vidro [9][10][11][12], resíduos da própria construção civil [13][14][15][16], resíduos cerâmicos [1, [17][18][19] e, também, resíduos agroindustriais [3, [20][21][22][23][24], dentre inúmeros outros.…”

Section: Introductionunclassified

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Aplicação de resíduos na fabricação de concreto: como técnicas analíticas de caracterização podem auxiliar na escolha preliminar do material mais adequado?

Bragagnolo

Korf

2020

Matéria (Rio J.)

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RESUMO A preocupação frente aos impactos negativos resultantes da obtenção e produção de agregados naturais e do cimento na produção do concreto, bem como a possibilidade de escassez desses, acabaram alavancando a busca por materiais alternativos. Dentre esses materiais, diversos estudos já avaliaram a aplicação de subprodutos de diferentes setores industriais para a fabricação do concreto. Contudo, considerando a gama de resíduos existentes, sem ainda possuir algum valor agregado, torna-se interessante avaliá-los para essa finalidade. Para tanto, a avaliação do potencial desses materiais exige a aplicação de diferentes técnicas para análise de diversas propriedades que são desejáveis ou requeridas. Nesse sentido, essa revisão bibliográfica buscou reunir as principais técnicas e metodologias que são aplicadas para a identificação das principais características que possibilitem sua aplicação como substitutos parciais de agregados ou cimento, em misturas para a fabricação do concreto.

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“…Investigation on the aggregates consumption showed that more than 40 billion tons are consumed annually. From this huge amount, between 67% and 75% belongs to concrete making [28]. According to the standard, the used aggregate must be clean and durable and must have no harmful chemicals [29].…”

Section: Cementmentioning

confidence: 99%

Investigation of the Effect of Larestan’s Pipeline Water on the Mechanical Properties of Concretes Containing Granite Aggregates

Forsat

Mirjavadi

2019

Advances in Civil Engineering

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In this study, the compressive strength of the concretes made by the pipeline water of Larestan has been investigated. Although the used water for the concretes must be clean, standard, and generally drinkable water, in Larestan city, the pipeline water is nonpotable water; meanwhile, this type of water is still being used in the mixture of the concretes by companies and contractors. Since in the initial tests the compressive strength of the normal samples did not satisfy the standards, 50% of granite aggregate was replaced with the purpose of increasing strength of the samples. en four types of samples were made, which are (1) normal concrete with pipeline water, (2) normal concrete with potable water, (3) granite concrete with pipeline water, and (4) granite concrete with potable water. e results showed that the compressive strength of normal samples is not standard in the case of using the pipeline water. is issue can be seen during the first four weeks of the samples, whereas these samples are placed in the standard zone by replacing 50% of granite aggregate instead of normal aggregates. is may be attributed to the compensating effect of granite aggregates in opposition to damaging effect of water. Also, by using the granite aggregates in the mixture, the compressive strengths of the samples were standard and almost identical in both cases of pipeline water and tap water. As a result, the concretes made in this city must include additives for increasing the strength, or the tap water should be used as a replacement for pipeline water.

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Properties of seashell aggregate concrete: A review

Cited by 148 publications

References 27 publications

Calcined Oyster Shell Powder as an Expansive Additive in Cement Mortar

Calcined Oyster Shell Powder as an Expansive Additive in Cement Mortar

Aplicação de resíduos na fabricação de concreto: como técnicas analíticas de caracterização podem auxiliar na escolha preliminar do material mais adequado?

Investigation of the Effect of Larestan’s Pipeline Water on the Mechanical Properties of Concretes Containing Granite Aggregates

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