Relationships between recycled concrete aggregates characteristics and recycled aggregates concretes properties

Omary, Safiullah; Ghorbel, Elhem

doi:10.1016/j.conbuildmat.2016.01.042

Cited by 200 publications

(97 citation statements)

References 23 publications

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“…Normally, aggregates represent around 70-80% of the components of concretes [16], therefore the abundant minerals in all of the analyzed samples (plant and laboratory) belonged to the primary aggregates; here, we identified feldspars such as plagioclases (Na and Ca feldspars) and anorthoclase (Na and K feldspars). Figures 5 and 6) is attributable to the presence of close XRD reflections of similar crystallographic planes of different feldspar minerals.…”

Section: Minerals Of the Original Aggregatesmentioning

confidence: 97%

Chemical and Mineralogical Characterization of Recycled Aggregates from Construction and Demolition Waste from Mexico City

et al. 2018

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Abstract:In this study, four samples of recycled aggregates from the construction and demolition waste of Mexico City were characterized in order to find innovative uses for these types of materials. Gravel and sand from a recycling plant were analyzed, as well as aggregates produced in the laboratory from demolished concrete collected from landfills. The characterization was carried out by means of XRD (X-ray Diffraction), chemical microanalysis (EDS), X-ray fluorescence (XRF), pH measurement, and sieve analysis. The minerals present in the analyzed materials were feldspars, cristobalite and pyroxene, which corresponded to the natural aggregates, as well as variable amounts of calcite, a product of the carbonation of the cement paste adhered to these aggregates, and in a smaller proportion, calcium hemicarboaluminate, rosenhanite, and tobermorite. The quality (amount of cement) of the original concrete has a great influence on the granulometry and the chemical-mineralogical composition of the aggregates, since there will be different quantities and qualities of the cement paste adhered to the aggregates depending on their size. Finally, the pH values measured in all samples fluctuated between 10.15 and 12.08, suggesting that these materials can be used in soil stabilization or in agricultural applications.

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Section: Minerals Of the Original Aggregatesmentioning

confidence: 97%

Chemical and Mineralogical Characterization of Recycled Aggregates from Construction and Demolition Waste from Mexico City

et al. 2018

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“…A presença dessa argamassa aumenta a porosidade e, consequentemente, a absorção de água dos agregados reciclados, em comparação com os agregados naturais [6]. Assim, devido às características intrínsecas dos ARCs, a definição de relações capazes de prever as propriedades relevantes dos concretos reciclados ainda é considerada uma questão em aberto [7]. Nos últimos anos, a comunidade científica concentrou-se principalmente na compreensão do comportamento mecânico dos concretos reciclados no estado endurecido [8], [9], [10], [11] e apenas alguns estudos analisaram suas propriedades no estado fresco [12], [13].…”

Section: Influência De Agregados Reciclados De Concreto Na Reologia Dunclassified

Influência de agregados reciclados de concreto na reologia do concreto

Amario

Pepe

Filho

2018

Libro De Comunicaciones / Livro Das Comunicações

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RESUMOO presente estudo avalia a influência de agregados de resíduo de concreto (ARC) no comportamento reológico de concretos reciclados no estado fresco. De fato, a elevada porosidade dos agregados e sua angularidade modificam a trabalhabilidade dos concretos contendo ARC. Portanto, esse é um estudo preliminar que tem como objetivo estender ferramentas conceituais para concretos contendo agregados reciclados, como por exemplo, o modelo de Bingham simplificado, cuja aplicação para concretos convencionais já está bem consolidada. Para isso, diferentes ensaios experimentais foram realizados a fim de investigar os efeitos das propriedades dos ARCs no comportamento no estado fresco de concretos reciclados. Os resultados obtidos demonstram que, de fato, os ARCs modificam as propriedades reológicas dos concretos, aumentando a sua trabalhabilidade e diminuindo sua tensão de escoamento. Além disso, suas propriedades são altamente relacionadas com a condição de umidade inicial dos agregados. PALAVRAS-CHAVE: reologia, trabalhabilidade, agregado reciclado de concreto, absorção de água.

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“…It demonstrates that there is a propensity of the RCA mixes to require more mixture. Water absorption coefficient of RCA has a slight increase is observed for recycled sand between 24 and 48h [1]. RCA has higher values of water absorption due to the amount of attached old cement mortar because The old cement paste always give an effect to the concrete in term of water absorption.…”

Section: Introductionmentioning

confidence: 97%

“…Based on the study of relationships between recycled concrete aggregates characteristics and recycled aggregates concretes properties, the open porosity is observed and that RCA are much porous than natural ones and both methods provide quite similar values [1]. Moreover, it can be pointed out that fine recycled aggregates are characterized by a higher porosity than coarse ones.…”

Section: Introductionmentioning

confidence: 99%

A study on the performance of concrete containing recycled aggregates and ceramic as materials replacement

Azmi

Khalid

Irwan

et al. 2017

IOP Conf. Ser.: Mater. Sci. Eng.

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Abstract. Natural fine aggregate materials are commonly used in development and commercial construction in Malaysia. In fact, concrete production was increased as linear with the growing Malaysia economy. However, an issue was production of concrete was to locate adequate sources of natural fine aggregates. There lot of studies have been conducted in order to replace the fine aggregate in which natural fine aggregate replace with the waste material in concrete preparation. Therefore, this study aims to utilize the Recycled Concrete Aggregate (RCA) and ceramic waste which has great potential to replace the natural aggregate in concrete mix with different type of method, admixture, and parameters. This research were focused on compressive strength and water absorption test to determine the optimum mix ratio of concrete mix. The concrete aggregate was chosen due to improvement capillary bonding mechanisms and ceramic presented similar strength compared to the conventional concrete using natural aggregate. Percent of replacement have been used in this study was at 25%, 35% and 45% of the RCA and 5%, 10% and 15% for ceramic, respectively. Furthermore, this research was conduct to find the optimum percentage of aggregate replacement, using water-cement ratio of 0.55 with concrete grade 25/30. The best percentage of replacement was the RCA35% C15% with the compressive strength of 34.72MPa and the water absorption was satisfied.

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Relationships between recycled concrete aggregates characteristics and recycled aggregates concretes properties

Cited by 200 publications

References 23 publications

Chemical and Mineralogical Characterization of Recycled Aggregates from Construction and Demolition Waste from Mexico City

Chemical and Mineralogical Characterization of Recycled Aggregates from Construction and Demolition Waste from Mexico City

Influência de agregados reciclados de concreto na reologia do concreto

A study on the performance of concrete containing recycled aggregates and ceramic as materials replacement

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