Un hormig&amp;#243;n autocompactante eco-amigable con &amp;#225;ridos gruesos reciclados

Oliveira, Luiz António Pereira de; Nepomuceno, Miguel; Rangel, M. S.

doi:10.3989/ic.11.138

Cited by 17 publications

(3 citation statements)

References 29 publications

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“…Some authors and studies recommend the use of Portland cement Type II (with a clinker content between 65% and 94%) for use in concrete with recycled aggregates to prevent the generation of alkali-aggregate reactions [33]. Other authors also recommend cement with a strength of no less than 42.5 MPa so that this characteristic is not a limiting factor.…”

Section: Introductionmentioning

confidence: 99%

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Recycling Aggregates for Self-Compacting Concrete Production: A Feasible Option

et al. 2020

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The use of construction and demolition wastes (C&DW) is a trending future option for the sustainability of construction. In this context, a number of works deal with the use of recycled concrete aggregates to produce concrete for structural and non-structural purposes. Nowadays, an important number of C&DW management plants in the European Union (EU) and other countries have developed robust protocols to obtain high-quality coarse recycled aggregates that comply with different European standards in order to be used to produce new concrete. The development of self-compacting concrete (SCC) is another way to boost the sustainability of construction, due to the important reduction of energy employed. Using recycled aggregates is a relatively recent scientific area, however, studies on this material in the manufacture of self-compacting concrete have proven the feasibility thereof for conventional structural elements as well as high-performance and complex structural elements, densely reinforced structures, difficult-to-access formwork and difficult-to-vibrate elements. This paper presents an original study on the use of coarse recycled concrete aggregate (CRA) to obtain self-compacting concrete. Concrete with substitution ratios of 20%, 50% and 100% are compared with a control concrete. The purpose of this comparison is to check the influence of CRA on fresh SCC as well as its physical and mechanical properties. The parameters studied are material characterization, self-compactability, compressive strength, and tensile and flexural strength of the resulting concrete. The results conclude that it is feasible to use CRA for SCC production with minimal losses in the characteristics.

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Section: Introductionmentioning

confidence: 99%

“…A number of studies ratify the higher absorption capacity of recycled aggregates at around 10% extra water and this is a premise to be considered. This higher demand for water is compensated by the use of superplasticizers [22,[33][34][35][36][37].…”

Section: Introductionmentioning

confidence: 99%

Recycling Aggregates for Self-Compacting Concrete Production: A Feasible Option

et al. 2020

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“…It is also remarkable that the research in the area of reusing materials for self compacting concrete (SCC) started in the last decade (12)(13)(14), and has increased very fast in the last years with interesting contributions (1)(2)(3)(15)(16)(17)(18)(19)(20)(21)(22)(23)(24), so, the necessity of some guidelines to assess the inclusion of these wastes in SCC is clear.…”

Section: Introductionmentioning

confidence: 99%

Guidelines for assessing the valorization of a waste into cementitious material: dredged sediment for production of self compacting concrete

Rozas¹,

Castillo²,

Martínez³

et al. 2015

Mater. construcc.

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This article presents some guidelines in order to analyse the feasibility of including a waste material in the production of a structural cementitious material. First of all, the compatibility of the waste with a cementitious material has to be assured; then, if necessary, a decontamination step will be carried out; after, decision on the type of material has to be taken based on different aspects, with special emphasis on the granulometry. As a last step, mechanical, environmental and durability properties have to be evaluated. Then the procedure is illustrated with a full example, obtaining a self compacting concrete (SCC) including dredged sediment taken from a Spanish harbour. RESUMEN:Directrices para evaluar la puesta en valor de un residuo en la fabricación de un material base cemento: producción de hormigón autocompactante a partir de sedimentos dragados. Este artículo presenta algunas directrices con el fin de analizar la posibilidad de incluir un material de desecho en la producción de un material base cemento estructural. En primer lugar, debe asegurarse la compatibilidad de los residuos con el material base cemento. Tras ello, si es necesario, se llevará a cabo la etapa de descontaminación del residuo. Después debe tomarse la decisión sobre el tipo de material a utilizar en base a diferentes aspectos, haciendo especial énfasis en la granulometría. Como último paso, deben evaluarse las propiedades mecánicas, ambientales y de durabilidad del producto final. El procedimiento a seguir se ilustra con un ejemplo concreto basado en la obtención de un hormigón autocompactante (SCC) incluyendo en su fabricación sedimentos dragados tomados de un puerto español.

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