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A STUDY ON RECYCLED CONCRETE AGGREGATES

recycled aggregate was obtained as 35% and that for natural aggregate as 29.9%. The abr asion value for recycled aggregate was obtained as 47.4% and that for natural aggregate as 29.6%. Water absorption of recycled aggregate (4.2%) was found to be higher when compared to the natural aggregate (0.4%). It was found that compressive strength of

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(PDF) Recycled aggregates in concrete production ...

These mortars had partial replacements of the natural fine aggregate (NFA) with recycled fine aggregate (RFA) and carbonated recycled fine aggregate (CRFA) in

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EMPLOYMENT OF RECYCLED AGGREGATES IN CONCRETE

EMPLOYMENT OF RECYCLED AGGREGATES IN CONCRETE PRODUCTION Elena GARBARINO Dr. Eng. Ph.D. 1 Marilena CARDU Prof. Eng. Ph.D. 2 Polytechnic of Turin, Turin, Italy 1 [email protected], 2 [email protected] Keywords: recycling, construction and demolition waste, waste processing, secondary raw materials, recycled aggregates, concrete Summary

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Reuse of recycled aggregate in the production of

01/01/2015  The recycled clay brick aggregate is the weakest and shows the largest fractured surface and is followed in turn by recycled concrete aggregate and normal aggregate. The same authors reported further that the average ratio of splitting tensile to compressive strengths of pervious geopolymer concrete was 14.4%, which was slightly higher than 8–14% for conventional concrete. The high

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COMPARATIVE LCA OF NATURAL AND RECYCLED COARSE

Hence, the life cycle assessment (LCA) of the production of recycled coarse aggregate (RCA) is conducted and compared with that of natural coarse aggregate (NCA) in accordance to the Indian scenario. In this context, the primary data during the production process of RCA and NCA are collected from the respective processing facilities. The system boundary of the process is based on cradle-to ...

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Use of Recycled Aggregates in Construction

Recycled Aggregates Recycled Concrete Aggregate (RCA) Crushed sound and clean waste concrete of at least 95% by weight of concrete with typical total contamination lower than 1% of the bulk mass. Class 1A RCA is a well graded RCA with no more than 0.5% brick content. Partial replacement (30%) for natural aggregate in concrete for sidewalks,

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Quantification of Recycled Concrete Aggregate (RCA ...

or recycled sources used primarily in road construction. However, out of this 13 million tonnes only 18% (2.3 million tonnes) consisted of recycled concrete material used as granular base between 2000 and 2004. The use of RCA as coarse aggregate in structural concrete and pavement applications in Ontario has therefore been very limited. This is mainly due to a lack of

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Suitability Investigation of Recycled Concrete

Recycled concrete aggregates were used in developed countries as a replacement to natural coarse aggregates for stabilizing the base course of road constructions, leading to save the natural reserve for generations to come. Though incorporation of recycled aggregates from CDW remarkably enhances the ecological footprint of concrete, the utilization of RCA in construction activities in several developing

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Using Recycled Aggregates for Concrete Production

Utilising high-quality recycled aggregates and its on-site concrete batching plant, Velde Pukk AS supplies the construction industry with a CE-certified concrete from 100% recycled sand and aggregates. Likewise, AF Gruppen, also based in Norway, produces high-quality washed sands and aggregates which have also Norwegian standard certification.

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EMPLOYMENT OF RECYCLED AGGREGATES IN CONCRETE PRODUCTION

1. Production of high grade recycled aggregates The aim of a technologically advanced treatment is the production of recycled aggregates (RA) with homogeneous characteristics, that can be re-utilized in the same original application; for example, the aggregates produced through the comminution of concrete monoliths could be employed in the

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Influence of amount of recycled coarse aggregates and ...

The recycled aggregates employed to produce the concrete were taken from a waste recycling area. They were obtained by crushing unknown waste concrete by use of an impact crusher. The composition of recycled aggregates determined by visual inspection were defined as 92.1% crushed concrete (49.1% of

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AN INTRODUCTION TO RECYCLED AGGREGATE

Recycled aggregates composed of original aggregates and adhered mortar. The physical properties of recycled aggregates depend on both adhered mortar quality and the amount of adhered mortar. The adhered mortar is a porous material; its porosity depends upon the w/c ratio of the recycled concrete employed. When structures made of concrete are demolished or renovated, concrete recycling is an

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Aggregates from Natural and Recycled Sources

of recycled aggregates should be evaluated locally based upon relative cost, quality, and market factors. Policy makers often must weigh the potential benefits of recycling with competing land use, development issues, and economic and societal pressures. EXECUTIVE SUMMARY Much of our Nation’s infrastructure (roads, buildings, and bridges) built during the middle twentieth century is in need ...

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COMPARATIVE LCA OF NATURAL AND RECYCLED COARSE AGGREGATE ...

Hence, the life cycle assessment (LCA) of the production of recycled coarse aggregate (RCA) is conducted and compared with that of natural coarse aggregate (NCA) in accordance to the Indian scenario. In this context, the primary data during the production process of RCA and NCA are collected from the respective processing facilities.

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Quantification of Recycled Concrete Aggregate (RCA ...

or recycled sources used primarily in road construction. However, out of this 13 million tonnes only 18% (2.3 million tonnes) consisted of recycled concrete material used as granular base between 2000 and 2004. The use of RCA as coarse aggregate in structural concrete and pavement applications in Ontario has therefore been very limited. This is mainly due to a lack of

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The dangers of using recycled aggregates in

Recycling Given the ever-increasing awareness of the environmental impact of construction and the desire to preserve the world’s resources, there is an onus on manufacturers to ensure their products can be recycled where possible when they reach the stage where they are no longer usable in their current form, known as end of life. The []

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Structural Adequacy of Recycled Coarse

This work presents experimental investigations on structural adequacy of recycled coarse aggregates in production of structural and non-structural concrete. Natural coarse aggregate used was crushed stones with 20mm maximum size. While recycled coarse aggregates used were extracted from concrete box culverts. The culverts were barely six (6) months old when the alignment of the road was slightly

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Waste Management in Morocco EcoMENA

Solid waste management is one of the major environmental problems threatening the Mediterranean Kingdom of Morocco. More than 5 million tons of solid waste is generated across the country with annual waste generation growth rate touching 3 percent. The proper disposal of municipal solid waste in Morocco is exemplified by major deficiencies such as lack of proper infrastructure and suitable

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Production of greener recycled aggregate concretes using ...

concrete aggregate was not considered for recycled aggregate concrete production because its application in structural concrete is generally not recommended.11,12 Figure 1 shows a macrograph of a coarse RCA particle produced from crushing old concrete cubes, accompanied by a SEM analysis. The SCMs used are limestone which was quarried from Hama governance, about 200km north of

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Aggregates from Natural and Recycled Sources

asphalt and selected other applications. Recycled aggregates are commonly used in lower quality product applications such as road base, where recycled aggregates meet or exceed State specifications. This material is presently often not con-sidered acceptable for

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The Environmental Impact of Recycled Concrete

recycled aggregate production is about 5% of the total aggregates needed to supply the construction industry. As other industries, the transformation activities to produce concrete generate waste. The standards are mostly conservative and the amount of recycled concrete aggregates used normally does not exceed 20% in weight on coarse aggregates. Furthermore, there is always a residual concrete

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COMPARATIVE LCA OF NATURAL AND RECYCLED COARSE AGGREGATE ...

Hence, the life cycle assessment (LCA) of the production of recycled coarse aggregate (RCA) is conducted and compared with that of natural coarse aggregate (NCA) in accordance to the Indian scenario. In this context, the primary data during the production process of RCA and NCA are collected from the respective processing facilities.

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NATURAL AGGREGATE REPLACEMENT BY RECYCLED MATERIALS

In our study, Portland cement CEM II 32.2, recycled concrete aggregate, steelmaking slag and natural aggregate were used as raw materials. Used recycled concrete aggregate (Fig. 1.) was created as a crushed and sorted waste from demolition building and roads. This material was obtained from recycling plant Rail and Transport

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Using Recycled Aggregates for Concrete Production

Utilising high-quality recycled aggregates and its on-site concrete batching plant, Velde Pukk AS supplies the construction industry with a CE-certified concrete from 100% recycled sand and aggregates. Likewise, AF Gruppen, also based in Norway, produces high-quality washed sands and aggregates which have also Norwegian standard certification.

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Study of Partial Replacement of Natural Aggregate by ...

1.1 Recycled Aggregate Recycled aggregate are produced from aged concrete that has been demolished and removed from foundations, pavements, bridges or buildings. It has been crushed and processed into various size fractions. Recycled Aggregate are extracted through the processing of the debris generated from the demolition of

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EMPLOYMENT OF RECYCLED AGGREGATES IN CONCRETE PRODUCTION

1. Production of high grade recycled aggregates The aim of a technologically advanced treatment is the production of recycled aggregates (RA) with homogeneous characteristics, that can be re-utilized in the same original application; for example, the aggregates produced through the comminution of concrete monoliths could be employed in the

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Life Cycle Assessment of Aggregates

Action Programme 21 Horse Fair Fax: 01295 819 911 0808 100 2040 Banbury, Oxon E-mail: [email protected] OX16 0AH. Life Cycle Assessment of Aggregates 3. Executive summary. The objective of the work reported here was to develop a Life Cycle Inventory (LCI) and Assessment (LCA) Model for the aggregates industries.

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Waste Management in Morocco EcoMENA

The Menace of Trash Burning. It is not uncommon to see trash burning as a means of solid waste disposal in Morocco. Currently, the municipal waste stream is disposed of in a reckless and unsustainable manner which has major effects on public health and the environment. The lack of waste management infrastructure leads to burning of trash as a form of inexpensive waste disposal.

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Production of greener recycled aggregate concretes using ...

Hence, the recycled concrete aggregates (RCA) are expected to be inevitable building materials during the post-war rebuilding in the country. Compared to natural aggregate, RCA, however, has a higher tendency of water absorption due to the attached old cement mortar, resulting in a decline of strength and durability of recycled aggregate

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THE PRODUCTION OF RECYCLED AGGREGATES FROM INERT WASTE

maximize the benefits associated with the use of aggregates originating from various sources, also non-conventional ones. As part of the SARMa project, this manual outlines the state-of-art of inert waste recycling, with emphasis on waste coming from construction and demolition activities and with focus on the production of recycled aggregates. This manual briefly illustrates a broad range of activities

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Using Recycled Aggregates for Concrete Production

Utilising high-quality recycled aggregates and its on-site concrete batching plant, Velde Pukk AS supplies the construction industry with a CE-certified concrete from 100% recycled sand and aggregates. Likewise, AF Gruppen, also based in Norway, produces high-quality washed sands and aggregates which have also Norwegian standard certification.

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Aggregates from Natural and Recycled Sources

of recycled aggregates should be evaluated locally based upon relative cost, quality, and market factors. Policy makers often must weigh the potential benefits of recycling with competing land use, development issues, and economic and societal pressures. EXECUTIVE SUMMARY Much of our Nation’s infrastructure (roads, buildings, and bridges) built during the middle twentieth century is in need ...

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Recycled Aggregates from Inert Waste

Annex 1: Inert wastes acceptable for the production of recycled aggregate Wastes from physical and chemical processing of non-metalliferous minerals Type and restrictions Waste code Waste gravel and crushed rock other than those mentioned in 01 04 07 01 04 08 May include excavations from mineral workings. Waste sand and clays 01 04 09 Waste sand only – many not include contaminated sand ...

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A Review on Recycled Aggregates for the

While examining the properties of HPC with recycled aggregates, the researchers examined recycled aggregate generated from demolition construction waste and the same were used in production of HPC. It was found that specific gravity, water absorption capacity, gradation, soundness and wear resistance of recycled aggregate were worse than natural aggregate due to the presence of residual

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Carbon Footprint of Recycled Aggregate Concrete

The analysis was focused on the aggregate production for the concrete manufacture: fine and coarse aggregate, coming from crushed virgin limestone, and recycled coarse aggregate, obtained from the trituration and classification of concrete debris. Limestone is the most common in the study region (Yucatán México). Five concrete mixes were produced with a water/cement ratio (w/c) of 0.5 and ...

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Recycled Aggregate Concrete - SlideShare

Recycled Aggregate Concrete 1. A STUDY ON “RECYCLED AGGREGATE CONCRETE” BY- NEELANJAN SARKAR MURSHIDABAD COLLEGE OF ENGG. TECH. BRANCH -- Civil engineering Year -- 3rd year (6th sem) 2. I would like to express my gratitude to all those who gave me the possibility to complete this project. I am deeply indebted to my my HOD (CIVIL) and the faculty members of my

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Aggregates for Concrete - GreenSpec

• ‘Aggregate’ is a term for any particulate material. It includes gravel, crushed stone, sand, slag, recycled concrete and geosynthetic aggregates. Aggregate may be natural, manufactured or recycled. • Aggregates make up some 60 -80% of the concrete

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