Concrete with construction and demolition wastes (CDW)

Cabral, Antônio Eduardo Bezerra

doi:10.1533/9780857098993.3.340

Cited by 14 publications

(13 citation statements)

References 47 publications

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“…CDW shows a vast array of elements in its composition, majorly containing SiO 2 (40-70 wt.%), CaO (10-25 wt.%), Al 2 O 3 (5-20 wt.%), Fe 2 O 3 (0.5-8 wt.%) and K 2 O (1-4 wt.%). Similar characteristics was also reported in other studies [31][32][33].…”

Section: Materials (Cdw Cement and Lime)supporting

confidence: 91%

Recycling of construction and demolition waste for producing new construction material (Brazil case-study)

Contreras

Teixeira

Lucas

et al. 2016

Construction and Building Materials

120

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Section: Materials (Cdw Cement and Lime)supporting

confidence: 91%

Recycling of construction and demolition waste for producing new construction material (Brazil case-study)

Contreras

Teixeira

Lucas

et al. 2016

Construction and Building Materials

120

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show abstract

“…O módulo de elasticidade do concreto é dependente do módulo de elasticidade dos agregados. Desta maneira, de acordo com CABRAL [64], quando há incorporação de agregados reciclados, que possuem menor módulo de elasticidade do que os agregados naturais, é esperada a redução desta propriedade no compósito. DE BRITO e SAIKIA [4] ressaltam que os agregados reciclados prejudicam a rigidez do concreto e a aderência da pasta de cimento aos agregados, o que resulta em diminuição no módulo de elasticidade.…”

Section: Módulo De Elasticidade Estáticounclassified

Influência dos agregados reciclados nas propriedades reológicas e mecânicas do concreto autoadensável

et al. 2018

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RESUMOA reciclagem da fração mineral dos resíduos de construção e demolição (RCD), na forma de agregados, é vista como uma alternativa para a redução dos impactos ambientais provocados pela construção civil. Os agregados reciclados apresentam maior absorção de água e menor resistência mecânica e densidade quando comparados aos agregados naturais, fatores esses que irão influenciar as propriedades dos concretos produzidos. Assim, o objetivo deste estudo foi investigar a influência dos agregados reciclados nas propriedades reológicas e mecânicas de concretos autoadensáveis (CAA). Para isso, foram analisadas quatro composições distintas de CAA, sendo uma delas produzida apenas com agregados naturais. As demais misturas utilizaram agregados miúdos e/ou graúdos reciclados em substituição aos agregados naturais, no teor de 20%, em massa. Também foi realizada a caracterização reológica da pasta de cimento e das argamassas destinadas à produção do CAA, por meio de reometria rotacional. A caracterização reológica de pastas, argamassas e concretos é uma maneira de avaliar o comportamento destes compósitos no estado fresco, podendo prover informações úteis que auxiliarão no processo de dosagem e controle de qualidade. As propriedades do concreto fresco foram avaliadas mediante os ensaios de espalhamento, tempo de escoamento t 500 e no funil V, habilidade passante e resistência à segregação. No estado endurecido foram determinadas as resistências à compressão, à tração por compressão diametral e módulo de elasticidade estático. Por meio dos resultados obtidos foi possível constatar perda de fluidez nas argamassas e concretos que empregaram agregados reciclados. Por outro lado, não foi verificada redução significativa nas propriedades mecânicas dos concretos produzidos com 20% de agregados graúdos ou miúdos reciclados.Palavras-chave: concreto autoadensável, agregados reciclados, resíduos de construção e demolição, reologia. ABSTRACTRecycling of mineral fraction of construction and demolition wastes (CDW), in form of aggregates, is seen as an alternative to reduce environmental impacts caused by construction. Recycled aggregates present higher water absorption and lower mechanical resistance and density when compared to natural ones, which will influence the properties of the produced concretes. The aim of this study was to investigate the influence of recycled aggregates in the rheological and mechanical properties of self-compacting concrete (SCC). For this, four distinct compositions of SCC were analyzed, one of them being produced only with natural aggregates. The other mixtures used fine and/or coarse recycled aggregates instead of natural aggregates, at 20% by mass. It was also carried out the rheological characterization of cement paste and mortars destined to SCC production, through rotational rheometry. The rheological characterization of pastes, mortars and concretes is a way to evaluate the behavior of these composites in fresh state, providing useful information that will aid in mix design process and quality contr...

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“…The process of obtaining recycled concrete aggregate from CDW materials consists of: demolition of existing structural elements, storage of these materials, crushing in jaw crushers, spreading into individual fractions, crushing in drum crushers, separation of the finest fraction of aggregate, recovery of undesirable elements (e.g. reinforcement) in magnetic separators [3,17]. As a result of this process, clean concrete aggregate with a given grain size is obtained.…”

Section: Recycled Concrete Aggregatementioning

confidence: 99%

Application of recycled concrete aggregate in mineral-cement-emulsion mixtures

Skotnicki

Kuźniewski

2018

TO - PK

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The article presents selected problems connected with the accomplishment of the research grant 'Application of reclaimed materials' as part of the joint project Development of Road Innovations (RID) co-financed by the National Centre of Research and Development as well as the General Directorate for National Roads and Motorways. The main aim of the project was to analyse possibilities of application of reclaimed concrete obtained from the demolition waste from the existing roads to produce new layers of road pavements. The article presents selected test results which show the influence of the reclaimed concrete content on the strength parameters of the MCE mixtures. Significant variation of the tested MCE mixtures properties depending on the percentage of the reclaimed material has been indicated. It has been suggested that new tests should be implemented in the process of MCE mixtures design process. An optimal content of reclaimed concrete has been determined in order to obtain required values of the analysed parameters. The application of reclaimed concrete in conventional MCE mixtures made it possible to achieve positive economical and environmental effects.

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Concrete with construction and demolition wastes (CDW)

Cited by 14 publications

References 47 publications

Recycling of construction and demolition waste for producing new construction material (Brazil case-study)

Recycling of construction and demolition waste for producing new construction material (Brazil case-study)

Influência dos agregados reciclados nas propriedades reológicas e mecânicas do concreto autoadensável

Application of recycled concrete aggregate in mineral-cement-emulsion mixtures

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