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Recycled concrete aggregates ScienceDirect

Recycled concrete aggregates ScienceDirect

Recycled concrete aggregates - ScienceDirect

Feb 01, 2005  The recycled concrete aggregates (RCA) are the main components of old concrete and for many reasons there is a need to re-use them. 2. Necessity for the re-use of RCAThe need for the production and use of RCA , , , , , is nowadays very urgent. This subject is considered very important especially for Greece, because there are now suitable ...

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Recycled Concrete Aggregate - an overview ScienceDirect ...

19.2.1 Recycled concrete aggregate (RCA) Coarse RCA complies to the requirements of maximum 5% masonry content, 5% fine materials, 0.5% lightweight material, 5% asphalt, 1% foreign material and 1% acid soluble sulfate, and is suitable for use in concrete as per BS 8500-2 (2006). In designated concrete RC20/25 to RC40/50, RCA can automatically ...

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Recycled Concrete - an overview ScienceDirect Topics

Recycled concrete and masonry (RCM) aggregate can be described as graded aggregate produced from sorted and clean waste concrete and masonry. The RCM material may contain brick, gravel crush rock or other forms of stony materials as blended materials. Class 1B-RCA as per HB 155 (2002) is an RCM aggregate.

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Use of fine recycled concrete aggregates ... - ScienceDirect

Jun 01, 2021  The coarse recycled concrete aggregates were obtained by casting normal-strength concrete (40 MPa, labeled T40) and high-strength concrete (80 MPa, labeled T80). Large bleeding and high air content occur with the dry coarse recycled aggregates originated from a lower strength concrete.

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Performance enhancement of recycled concrete aggregate – A ...

Jan 20, 2016  Recycled concrete aggregate differ from natural aggregate as the former contains hardened cement mortar. The adhered cement mortar on recycled concrete aggregate has higher porosity and water absorption and lower strength than natural aggregate do. It has negative effects on the mechanical properties and durability of fresh and hardened ...

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Effect of binder content and recycled concrete aggregate ...

Influence of recycled concrete aggregates on the flexural properties of reinforced alkali activated slag concrete Constr. Build. Mater. , 102 ( 2016 ) , pp. 51 - 58 , 10.1016/j.conbuildmat.2015.10.148

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The Utilization of Recycled Aggregate ... - ScienceDirect

Jul 01, 2020  The slump test is the common and practical workability test for fresh concrete and is performed in accordance with ASTM C143 . Fig. 1 shows the slump values for HPCs that are prepared with natural aggregate (b) and RA (c). The maximum detected slump value of HPC without RA was 185 mm .Previous studies, however, had demonstrated that completely replacing natural aggregate with

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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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Reuse of industrial and agricultural ... - sciencedirect

For other aggregates, specific gravity lies in the range of 1.5 to 2.6. Water absorption of laterite was higher (greater than 40%) compared to the other aggregates. Lowest water absorption was reported for artificial slag aggregate , recycled concrete aggregate and BA . The colour of the oil palm shell (OPS) usually differs from dark grey to ...

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Contents lists available at ScienceDirect Construction and ...

of concrete waste isproduced worldwide, which mostly disposed of inlandfills.Alternatively, it can be recycled as aggregate con- creteproduction,whichnotonly reducesthe quiredspaceforitsdis-

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Potential of recycled fine aggregates powder as filler in ...

Potential of recycled fine aggregates powder as filler in asphalt mixture Construction and Building Materials 25 (2011) 3909–3914 Contents lists available at ScienceDirect Construction and Building Materials journal homepa...

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An Experimental Study on Replacement of Coarse Aggregate ...

P.Pooja, Manendra Vaitla, Gudapati Sravan, et. al. Study on Behavior of Concrete with Partial Replacement of Fine Aggregate with Waste Plastics, ScienceDirect Materials Today: Proceedings 8. 2019; 8: 182–187p.

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Performance evaluation of cement stabilized recycled ...

Performance evaluation of cement stabilized recycled mixture with recycled concrete aggregate and crushed brick. This paper presents an experimental investigation on the performance of cement stabilized recycled mixture containing recycled concrete aggregate (RCA) and crushed brick (RCB), which are separated from recycled aggregate.

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Influence of fly ash as a cement addition on the hardened ...

Oct 19, 2007  The effects of the use of Class F fly ash as a cement addition on the hardened properties of recycled aggregate concrete were determined. In this study, four series of concrete mixtures were prepared with water-to-cement (w/c) ratios of 0.55, 0.50, 0.45 and 0.40. The recycled aggregate was used as 0%, 20%, 50% and 100% replacements of coarse natural aggregate. Furthermore, fly ash

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The Structural Integrity of Recycled Aggregate Concrete ...

The Structural Integrity of Recycled Aggregate Concrete Produced with Fillers and Pozzolans presents a review on the use of by-products, fillers and pozzolanic materials in the development of concrete, with an emphasis on structural integrity. The volume is broken down into key sections, including a review of the types of materials that are used as latent hydraulic supplements, fillers and ...

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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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(PDF) A new method of producing high strength oil palm ...

Fig. 2. Relationship between early (1, 3 and 7 day) and 28-day compressive This size is lower than in most previous studies. Maximum particle strength for OPS concrete made with crushed OPS aggregate. size of 15 mm [31], 14 mm [12,23,32], 12.7 mm [33], 12.5 mm [15,17,19,34] and 9.5 mm [13] was used in previous studies.

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Field study on concrete footpath with recycled plastic and ...

10% recycled plastics 10% crushed glass as coarse aggregate replacement in concrete. Unconfined compressive strength, indirect tensile strength and capillary water uptake. Utilizing recycled plastic and crushed glass in concrete footpath was satisfactory. Schmidt hammer test results satisfied the strength requirement for concrete footpaths.

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Properties of Concrete Manufactured Using Steel Slag

Compressive, tensile, flexural strength, rapid chloride penetration, acid resistance to Hcl, H 2 SO 4 and deflection for concrete containing steel slag in coarse

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Handbook Of Recycled Concrete And Demolition Waste ...

Aggregate Finish on Concrete Sandvik Concrete Recycling setup THE Best Driveway Building Material: Recycled Asphalt 3 Aquarium filters YOU CAN BUILD RIGHT NOW DIY PROJECT -- recycled concrete tire tracks Recycled Concrete Aggregates (RCA) at CRUSHCRETE In Pennsylvania Handbook of Recycled Concrete and Demolition Waste Woodhead Publishing Series ...

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not used concrete plants vietnam

RailroadTies: Precast Concrete or Wood? Crawford studied the greenhouse gas emissions of reinforced concrete ties and wooden ties based on one kilometer (0.62 miles) length of track over a 100-year life cycle that includes mining of raw minerals to make concrete versus timber harvesting tie manufacture tie installation and use and finally disposal at the end of the ties' useful life.

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Reuse of industrial and agricultural ... - sciencedirect

For other aggregates, specific gravity lies in the range of 1.5 to 2.6. Water absorption of laterite was higher (greater than 40%) compared to the other aggregates. Lowest water absorption was reported for artificial slag aggregate , recycled concrete aggregate and BA . The colour of the oil palm shell (OPS) usually differs from dark grey to ...

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Concrete Based on Recycled Aggregates – Recycling and ...

Dec 30, 2017  Concrete Based on Recycled Aggregates – Recycling and Environmental Analysis: a Case Study of Paris’ Region. The use of recycled concrete aggregates as an alternative source of coarse aggregates for the production of new concrete can help to solve the problem of depleting natural resources and that of growing waste disposal crisis.

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Shear Behaviour of Recycled Aggregate Concrete Beams With ...

Jun 15, 2017  An experimental study of the shear behaviour of recycled aggregate concrete (RAC) beams with and without shear reinforcement is presented. Nine full-scale simply supported beams were loaded in four-point bending tests until failure. Three different replacement ratios of coarse natural with coarse recycled concrete aggregate (0%, 50% and 100% ...

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The Structural Integrity of Recycled Aggregate Concrete ...

The Structural Integrity of Recycled Aggregate Concrete Produced with Fillers and Pozzolans presents a review on the use of by-products, fillers and pozzolanic materials in the development of concrete, with an emphasis on structural integrity. The volume is broken down into key sections, including a review of the types of materials that are used as latent hydraulic supplements, fillers and ...

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Influence of recycled aggregates on properties of self ...

recycled concrete allows the maximum use of crushed concrete, i.e., the coarse and fine fractions, and the crushed concrete powder. Therefore, self-consolidating concretes were mixed with 50% of the coarse aggregate replaced by recycled aggregates (Patagonia gravel) and with 20% of the fine aggregate (natural sand) replaced

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Stress-strain response analysis of demolition wastes as ...

The secondary goal of this study was to investigate the stress-strain response of pavements with aggregate base courses made of three types of recycled construction and demolition wastes, being recycled concrete aggregate (RCA), crushed brick (CB), and waste excavation rock (WR).

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Strength and durability of recycled aggregate concrete ...

Feb 02, 2012  the case of recycled aggregate with 8–16 mm particle size, and near 60% in recycled aggregate with 4–8 mm particle size. Hasaba et al. [7] reported that 35.5% of old mortar is attached to natural gravel in recycled aggregate with 5–25 mm particle size produced from concrete with 24 MPa compressive strength. For the same

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Influence of fly ash as a cement addition on the hardened ...

Oct 19, 2007  The effects of the use of Class F fly ash as a cement addition on the hardened properties of recycled aggregate concrete were determined. In this study, four series of concrete mixtures were prepared with water-to-cement (w/c) ratios of 0.55, 0.50, 0.45 and 0.40. The recycled aggregate was used as 0%, 20%, 50% and 100% replacements of coarse natural aggregate. Furthermore, fly ash

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Effect of the quality of parent concrete on the properties ...

2.1.2. Aggregates. Natural and recycled aggregates were used as the coarse aggregate in the con-crete mixtures. Crushed natural granite was used as the natural aggregate. The recycled aggregates were obtained by crushing old concrete cubes previously pre-pared in the laboratory. The strength grades of the cubes (28-day designed com-

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Evaluation of sulfate resistance of concrete with recycled ...

The use of aggregate obtained from crushed concrete is an example of recycling and conservation of raw materials [2]. This may be one of significant efforts in achieving a sustainable con-struction. The major difference between natural aggregate and recycled concrete aggregate (RCA) is

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New Trends in Eco-efficient and Recycled Concrete - 1st ...

Nov 16, 2018  New Trends in Eco-efficient and Recycled Concrete describes different recycled materials that have been used in eco-efficient concrete, reviewing previous publications to identify the most effective recycled materials to be applied in concrete manufacture. New trends on eco-efficient concrete are presented, filling a gap in the market. Sections cover various recycled materials applied

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Coarse Aggregates Research Papers - Academia

Crushed large oil palm shell (OPS) was used as a coarse aggregate in four different concrete mixtures. The stress-strain behavior and modulus of elasticity of OPS concrete were investigated and compared to granite normal weight concrete (NWC) and expanded clay lightweight concrete (LWC).

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(PDF) A new method of producing high strength oil palm ...

Fig. 2. Relationship between early (1, 3 and 7 day) and 28-day compressive This size is lower than in most previous studies. Maximum particle strength for OPS concrete made with crushed OPS aggregate. size of 15 mm [31], 14 mm [12,23,32], 12.7 mm [33], 12.5 mm [15,17,19,34] and 9.5 mm [13] was used in previous studies.

get price

Field study on concrete footpath with recycled plastic and ...

10% recycled plastics 10% crushed glass as coarse aggregate replacement in concrete. Unconfined compressive strength, indirect tensile strength and capillary water uptake. Utilizing recycled plastic and crushed glass in concrete footpath was satisfactory. Schmidt hammer test results satisfied the strength requirement for concrete footpaths.

get price