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concrete with recycled aggregates: the portuguese

concrete with recycled aggregates: the portuguese

Concrete with recycled aggregates: the Portuguese ...

Apr 14, 2010  10%  The main objective of this study is to define expedient procedures to estimate the properties of structural concrete that contains recycled aggregates. Experimental results from Portuguese research, most of which supervised by the first author, were used to establish a relationship between some properties of hardened concrete (compressive strength, splitting and

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Concrete with recycled aggregates: the Portuguese experimental research

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The graphic analysis of each property shows the relationship between those for recycled aggregate concrete (RAC) mixes and a reference mix using natural aggregates only (RC).

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Nov 16, 2010  The American Concrete Institute. Founded in 1904 and headquartered in Farmington Hills, Michigan, USA, the American Concrete Institute is a leading authority and resource worldwide for the development, dissemination, and adoption of its consensus-based standards, technical resources, educational programs, and proven expertise for individuals and organizations involved in concrete

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CONCRETE WITH RECYCLED AGGREGATES

Only coarse recycled concrete aggregates may replace natural aggregates. The proposed approaches allow two different levels of recycled aggregate content, 20 and 100%. In the first case, structural concrete can be produced up to a compressive strength of 35 MPa, whereas for the second one

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The objective of this research is the production of concrete with recycled aggregates (RA) from various CDW plants around Portugal. The influence of the RA collection location and consequently of ...

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Performance of Concrete Made with Recycled Aggregates from ...

The objective of this research is the production of concrete with recycled aggregates (RA) from various CDW plants around Portugal. The influence of the RA collection location and consequently of their composition on the characteristics of the concrete produced was analysed. In the mixes produced in this research RA from five plants (Valnor, Vimajas, Ambilei, Europontal and Retria) were used ...

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Shrinkage and creep performance of concrete with recycled ...

This research analyses the shrinkage and creep performance of concrete with recycled aggregates from various Portuguese construction and demolition waste recycling plants, studying the influence of the properties and composition of each recycled aggregate source on the characteristics of concrete produced with them.

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Microstructure of Concrete with Aggregates from ...

Dec 23, 2015  This paper intends to analyze the microstructure of concrete with recycled aggregates (RA) from construction and demolition waste from various Portuguese recycling plants. To that effect, several scanning electron microscopy (SEM) and energy-dispersive X-ray

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Structural concrete with incorporation of coarse recycled ...

Concrete with recycled aggregates: the Portuguese experimental research By Jorge Brito Influence of the Crushing Process of Recycled Aggregates on Concrete Properties

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Recycled Concrete Aggregate in Portland Cement Concrete

Aggregates can be produced by crushing hydraulic cement concrete and are known as recycled concrete aggregates (RCA). This report provides results from a New Jersey Department of Transportation study to identify barriers to the use of RCA in new Portland cement concrete and to provide a recommendation as to whether this material should be permitted on Department of

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Permeability properties of self-compacting concrete with ...

Jan 31, 2014  Taking into account the construction demolition wastes heterogeneity, the Portuguese recommendation E 471/2009 limit the incorporation of recycled coarse aggregate in structural concrete production. The replacement of natural aggregates by recycled aggregates is limited by this document in order to avoid large variations of the elastic modulus ...

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An Overview of Recycled Concrete Aggregate ETM Recycling

Sep 27, 2020  Recycled aggregates are only classified as recycled concrete aggregates (RCA) when the primary material is concrete. By crushing and compressing existing waste concrete and combining it with aggregate, producers can create concrete aggregate to a specific size and quality, which makes it very cost effective to purchase.

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Recycled Concrete Aggregate Crushed Concrete Aggregate ...

Mar 05, 2021  Recycled Concrete Aggregate is that the use of debris from dismantled concrete structures. utilization is cheaper and a lot of ecological than truckage debris to a lowland.. Crushed debris is often used for road gravel, revetments, holding walls, landscaping gravel, or staple for brand spanking new concrete. giant items are often used as bricks or slabs or incorporated with new concrete

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British Standards and the use of recycled aggregate in ...

5.2.3.4 Recycled aggregates (1) Recommendations for the use of coarse recycled aggregates are given in Annex E. NOTE No recommendations for the use of fine recycled aggregate are given in this standard. Annex A Initial tests (9) Where concrete containing recycled aggregates is to be produced, the need to carry

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Effects on concrete durability of using recycled ceramic ...

Mar 11, 2006  Pereira AS (2002) Use of coarse recycled aggregates in concrete production (in Portuguese). MSc Thesis, IST, Lisbon, p. 198. 4. de Brito J, Pereira AS, Correia JR (2005) Mechanical behaviour of non-structural concrete made with recycled ceramic aggregates, Cement and Concrete Composites, 27(4):429–433. Article Google Scholar 5.

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(PDF) Environmental life cycle assessment of concrete made ...

This paper concerns the use of fine recycled concrete aggregates to partially or globally replace natural fine aggregates (sand) in the production of structural concrete. To evaluate the viability ...

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Crushed Concrete Aggregates - Properties and Uses of ...

🕑 Reading time: 1 minuteCrushed concrete aggregates also called as recycled concrete aggregates are fragments and pieces of concrete buildings which are demolished or rebuild. These crushed concrete are cleaned from dirt and broken to smaller pieces to manufacture aggregate which is termed as recycled aggregate. Crushed concrete aggregate eliminates the need for disposal by []

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Experimental Study on a Prediction Model of the Shrinkage ...

of the concrete creep of di erent recycled aggregates and a prediction model suitable for recycled aggregate concrete. Compared with conventional concrete, the use of recycled aggregate to absorb part of the mixed water and cement slurry for coating produces a stronger ITZ (Interface transition zone), which can reduce the creep strain by up to 23%.

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How to Use Glass Aggregate in Concrete - BSGglasschip

Jul 26, 2021  Glass Aggregate Crushing. Today worldwide post-industrial and post-consumer recycled aggregates are being crushed, cleaned and processed and later properly packaged for contractors and builders to purchase for concrete or terrazzo applications. So If you want to produce concrete that truly shines and glows put some glass in the mix.

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Construction and Demolition Wastes: Valorisation and ...

According to the Portuguese Environmental Agency (APA), there are 400+ licensed operators that recycle wastes from ... The use of recycled concrete aggregates on the production of high performance recycled aggregate concrete is perfectly feasible from mechanical and durability viewpoints. However, some aspects need to be

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Using recycled concrete as aggregate in concrete pavements ...

A total of ten different concrete mixtures containing recycled concrete aggregate (RCA) were designed to meet the requirements of Indiana Department of Transportation (INDOT) specifications. These included three different RCA replacement levels (30%, 50% and 100% by weight of the natural coarse aggregate) and two different cementitious systems ...

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Evaluation of Recycled Concrete for Use as Aggregate in ...

University, recycled concrete aggregates (RCA) can reduce costs, environmental impacts, and project delivery time when used in concrete pavements (Garber, et al., 2011). A WSDOT report adds that dwindling supplies of high-quality natural aggregate, increasingly limited landfill

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SciELO - Brasil - Using fine recycled concrete aggregate ...

Using fine recycled concrete aggregate for mortar production. Catarina Neno I; Jorge de BritoI, * * e-mail: [email protected] ; Rosário Veiga II. I DECivil-IST, Technical University of Lisbon, Av. Rovisco Pais, 1049-001, Lisbon, Portugal . II Department of Buildings, National Laboratory of Civil Engineering LNEC, Av. do Brasil, 101, 1700-066, Lisbon, Portugal

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Performance of Recycled Aggregate Concrete

aggregate concrete ,the slump test was about 1.0cm slump for 60 % coarse recycled aggregate concrete and increases as the percent of recycled aggregate decreases . The compressive strength of recycled aggregate concrete with 60 % recycled aggregate, is about 76 % of natural aggregate concrete. The compressive strength increases as the

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Recycled Concrete Aggregate - Braen Stone

Dense graded recycled concrete aggregate, also known as RCA, is an extremely popular alternative to virgin stone aggregates when possible. RCA is usually made up of old concrete from sidewalks, pavements, curbing and building slabs. RCA is a great alternative to using quarry process or DGA.

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Recycling of Concrete

Concrete with recycled aggregate is durable. C2CA: Cement and aggregates from EOL concrete 13 Reuse of old cement paste Cement production: ~10% of CO 2 emissions 2000 tons of old cement paste concentrate turned into new cement at ENCI, Maastricht.

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Study on the Utility of Recycled Coarse Aggregates in ...

Jan 17, 2019  The demolished concrete can be utilized as recycled coarse aggregate (RCA) in order to make a new concrete (RCA concrete) by either partially or fully replacing the natural coarse aggregate (NCA). Many researchers have examined the physical and mechanical properties of RCA concrete and have concluded that the mechanical strength of RCA concrete ...

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Using Construction Demolition Waste (CDW) as Recycled ...

Jul 24, 2021  Recycling of waste concrete to obtain the recycled concrete aggregates (RCA) for base and/or sub-base materials in road construction is a foremost application to be promoted to gain economical and ...

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Experimental Study on a Prediction Model of the Shrinkage ...

of the concrete creep of di erent recycled aggregates and a prediction model suitable for recycled aggregate concrete. Compared with conventional concrete, the use of recycled aggregate to absorb part of the mixed water and cement slurry for coating produces a stronger ITZ (Interface transition zone), which can reduce the creep strain by up to 23%.

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Structural concrete with simultaneous incorporation of ...

The recycled aggregate concrete (RAC) mixes were compared with a reference concrete (RC) produced solely with natural aggregates (NA). Concerning the replacement percentages for fine and coarse recycled concrete aggregates (FRCA/CRCA%), the following were considered: 25/25; 50/50; 100/0; 0/100 and 100/100%.

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[PDF] Porosity of recycled concrete with substitution of ...

In this paper, we present the experimental analysis of samples of recycled concrete (RC) with replacement of natural aggregate (NA) by recycled aggregate originating from concrete (RCA). The results of the tests of mechanical properties of RC were used for comparison with tests of mercury intrusion porosimetry (MIP), in which the distribution of the theoretical pore radius, critical pore ratio ...

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Recycled Aggregates Boral

Recycled aggregates are produced from recycled materials which include recycled concrete, brick and masonry. Can be a single sized material typically 20 mm, 14 mm, 10 mm or 7 mm. Fine Aggregate is aggregate less than 5 mm. Coarse Aggregate is normally greater than 5 mm. Can be a single sized material or a graded aggregate consisting of a blend ...

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Microstructural Characterization of Concrete Prepared with ...

May 15, 2013  The used raw materials were natural aggregate, recycled aggregate obtained from a standard concrete, and Portland cement. The substitution extent was 0, 10, 50, and 100 vol%; hydration was stopped at 9, 24, and 96 h and 28 days.

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