• Use of coarse recycled aggregates from precast concrete ...

    Nov 30, 2014· Therefore, the use of superplasticizers in high-quality recycled aggregates concrete is highly recommended, leading to excellent performances. The coarse recycled aggregates generated from precast elements and the use of superplasticizers open new perspectives for recycled aggregates concrete, enabling the production of high-performance concrete.

  • Fresh-State and Mechanical Properties of High-Performance ...

    This paper presented the results of an experimental campaign whose ultimate goal was to produce high-performance self-compacting concrete (SCC) using recycled aggregates (RA) from the precast industry. The results of the fresh-state and mechanical properties tests performed on six concrete mixes (using RA from the precast industry) were presented.

  • The use of recycled demolition aggregate in precast ...

    The use of recycled demolition aggregate in precast concrete products – Phase III: Concrete pavement flags Marios N. Soutsosa,⇑, Kangkang Tangb, Stephen G. Millardb a School Planning, Architecture and Civil Engineering, Queen's University Belfast, David Keir Building, Belfast BT9 5AG, Northern Ireland, United Kingdom bDepartment of Civil Engineering, Xi'an Jiaotong-Liverpool ...

  • Paving with Precast Concrete Made with Recycled Mixed ...

    This research aimed to prove the feasibility of producing two types of precast elements widely used in construction, such as curbstones and paving blocks, using recycled concrete made with a 50% substitution of the natural gravel by recycled mixed aggregates with a …

  • (PDF) Using recycled concrete aggregates in precast ...

    Among the construction waste that could be recycled, we can mention the aggregates resulting from crushed concrete. While the acquired knowledge about the use of recycled aggregates in new concrete mixes is fairly large, the use of such aggregates in

  • MAKING CONCRETE FROM RECYCLED MATERIALS

    MAKING CONCRETE FROM RECYCLED MATERIALS Researchers work toward developing reliable standards for the use of recycled concrete aggregates in new concrete. The Issue Making concrete out of recycled concrete aggregate, or RCA, can be a sustainable and cost-saving alternative to other aggregates. However, the quality of concrete made with

  • Precast products made of recycled concrete - Concrete ...

    The use of recycled aggregates for precast products made of vibrated concrete results in the following advantages: » The products are not reinforced. » The low degree of flow does not compromise the characteristics of the concrete.

  • Ways to Recycle and Reuse Concrete

    Jan 07, 2019· Recycled concrete can be used in many of the same ways as you would use new materials, such as gravel, paving materials, and aggregates. Permeable paving for walkways, driveways, and other outdoor hard surfaces: Broken concrete that is carefully laid creates a stable, porous traffic surface that rainwater can filter through.

  • Sustainable Construction: Use of Recycled Concrete Aggregate

    Jul 07, 2015· RECYCLING OF CONCRETE AT A PRECAST CONCRETE PLANT Authors: A van Acker. x. ... water absorption and freeze-thaw resistance. This paper describes the production method for recycled concrete aggregate, results of an experimental work undertaken, practical experience gained from the findings and the cost/benefits of recycling.

  • Service-Load Behavior of Precast/Prestressed Concrete ...

    This paper describes an experimental investigation on the use of recycled concrete aggregates (RCAs) as replacement for coarse natural aggregates (NAs) in precast/prestressed concrete struc-tures. Specifically, sustained service load tests were conducted on 18 pretensioned beams with two different levels of RCA (50%

  • Paving with Precast Concrete Made with Recycled Mixed ...

    widely used in construction, such as curbstones and paving blocks, using recycled concrete made with a 50% substitution of the natural gravel by recycled mixed aggregates with a significant ceramic content (>30%). In order to prove the quality of such mass concrete recycled precast elements, two

  • Decorative Precast Concrete Specialty Aggregate | Kafka ...

    Jan 28, 2021· Specialty Aggregates Crushed to Size for Decorative Precast Concrete Pavers & Amenities. With nearly 60 different colors of natural stone and recycled materials available in any size specification, Kafka Granite's precast concrete aggregates and manufactured sands insure that your company can produce perfectly colored precast concrete pavers, site furnishings, amenities, or …

  • Sustainability and Precast Concrete

    precast concrete members may be reused in other applications. Precast concrete is also friendly to downcycling, in which building materials are broken down, because it comes apart with a minimum amount of energy and retains its original qualities. An example of downcycling would be the use of crushed precast concrete as aggregate in new ...

  • Use of Recycled Concrete Aggregates in Precast/Prestressed ...

    Jan 01, 2016· This paper describes a preliminary investigation on factors related to the use of recycled concrete aggregates (RCA) in precast/prestressed concrete applications. In particular, the effects of RCA are experimentally investigated for: 1) the bond between seven-wire prestressing steel strand and concrete; 2) the compression strength gain of ...

  • (PDF) Use of Recycled Concrete Aggregates in Precast ...

    This paper describes an experimental investigation on the use of recycled concrete aggregates (RCAs) as replacement for coarse natural aggregates (NAs) in precast/prestressed concrete structures.

  • Recycle! - National Precast Concrete Association

    Jul 05, 2019· In 2010, StructureCast, a custom precast concrete manufacturer located in Bakersfield, Calif., opened a four-acre crushing and screening plant to recycle concrete and washout. Since opening, approximately 10,000 tons of concrete has been recycled every month.

  • What is Precast Concrete? | American Precast

    Where precast concrete starts to differ from regular concrete is in how it's made. Previously, cast-in concrete was built using forms, then having to pour the concrete, waiting for the concrete to cure, all while being done on-site. All of the raw materials have to be shipped to the project site. Precast concrete is not made on-site.

  • Precast concrete | YourHome

    Precast concrete elements can be crushed and reused as aggregate for new concrete or for road bases or construction fill, creating economic and environmental savings. Recycled aggregate and steel can and are commonly used in precast concrete. Designers should specify their inclusion to …

  • Recycling in the precast concrete industry | P. Francisco ...

    Some precast concrete plants manufacture products with recycled aggregates (RA) for many years. Part of them are gained by washing fresh concrete, but traditionally, RAs are got from concrete products after being tested under the factory production control or because a nonconformity is identified.

  • (PDF) Using recycled concrete aggregates in precast ...

    The use of bibliometric tools has allowed analysing, quantifying and visualising the conceptual and social aspects of the scientific field "precast concrete with recycled materials"; as well ...

  • Concrete Mix Design: Understanding Aggregate - NPCA - Precast

    Mar 02, 2018· Aggregate shape's effect on concrete quality. By Frank Bowen. Editor's Note: This is the second article in a year-long series that explores the science of concrete to provide a better understanding of mix design. The series will be collaboratively written by Paul Ramsburg, technical sales specialist at Sika Corp., and Frank Bowen, quality control manager at Piedmont Precast.

  • Using recycled concrete aggregates in precast concrete ...

    May 23, 2012· While the acquired knowledge about the use of recycled aggregates in new concrete mixes is fairly large, the use of such aggregates in the production of concrete blocks is very limited. This research aims to study the influence of the use of recycled aggregates in precast concrete hollow blocks on their compressive strength.

  • End of life recycling - concretecentre.com

    A specific subset of recycled aggregates is recycled concrete aggregates (RCA) where the masonry content is limited to not more than five per cent. The performance characteristics of RCA are better than RA and consequently there are fewer restrictions on the use of RCA in concrete. Provision for the use of RCA in concrete is given in BS 8500-2.

  • (PDF) Use of recycled concrete aggregate in high-strength ...

    Materials and Structures/Mat&iaux et Constructions,Vol. 33, November 2000, pp 574-580 Use of recycled concrete aggregate in high-strength concrete M. C. Limbachiya, T. Leelawat and R. K. Dhir Concrete TechnologyUnit, Departmentof Civil Engineering, Universityof Dundee, DundeeDD1 4HN, Scotland, UK Paper received:February25, 2000; Paperaccepted:April 17, 2000 A B S T R A C T R 14 …

  • Precast Concrete Aggregates & Manufactured Sands | Kafka ...

    Specialty Aggregates Crushed to Size for Architectural & Decorative Precast Concrete. Kafka Granite, LLC produces more than 60 different types of crushed Granite, Quartz, Marble, and Recycled Materials for use in precast concrete products. Our specialty aggregates and manufactured sands can be crushed and screened to meet any size specification ...

  • Use of recycled concrete aggregate in high-strength ...

    The results of a test programme to study the use of recycled concrete aggregate (RCA) in high-strength, 50 N/mm2 or greater, concrete are described. The effects of coarse RCA content on the ceiling strength, bulk engineering and durability properties of such concretes have been established. The results showed that up to 30% coarse RCA had no effect on concrete strength, but therafter there was ...

  • Effect of recycled concrete aggregates on strength and ...

    aggregates, such as crushed limestone and gravel, while the demolition of old concrete structures offers significant sourc-es of recycled concrete aggregate (RCA). Currently, RCA use in the United States is largely limited to nonstructural applications, such as road base. Uncertainty and variability

  • Use of RECYCLED AGGREGATES In CONCRETE- A Paradigm Shift

    The extensive research on recycled concrete aggregate and recycled aggregate concrete (RAC) as started from year 1945 in various part of the world after second world war, but in a fragmented manner. First effort has been made by Nixon in 1977 who complied all the work on recycled aggregate carried out between 1945-1977 and prepared a state-of ...

  • Use of coarse recycled aggregates from precast concrete ...

    Nov 30, 2014· Therefore, the use of superplasticizers in high-quality recycled aggregates concrete is highly recommended, leading to excellent performances. The coarse recycled aggregates generated from precast elements and the use of superplasticizers open new perspectives for recycled aggregates concrete, enabling the production of high-performance concrete.

  • Fresh-State and Mechanical Properties of High-Performance ...

    This paper presented the results of an experimental campaign whose ultimate goal was to produce high-performance self-compacting concrete (SCC) using recycled aggregates (RA) from the precast industry. The results of the fresh-state and mechanical properties tests performed on six concrete mixes (using RA from the precast industry) were presented.

  • The use of recycled demolition aggregate in precast ...

    The use of recycled demolition aggregate in precast concrete products – Phase III: Concrete pavement flags Marios N. Soutsosa,⇑, Kangkang Tangb, Stephen G. Millardb a School Planning, Architecture and Civil Engineering, Queen's University Belfast, David Keir Building, Belfast BT9 5AG, Northern Ireland, United Kingdom bDepartment of Civil Engineering, Xi'an Jiaotong-Liverpool ...

  • Paving with Precast Concrete Made with Recycled Mixed ...

    This research aimed to prove the feasibility of producing two types of precast elements widely used in construction, such as curbstones and paving blocks, using recycled concrete made with a 50% substitution of the natural gravel by recycled mixed aggregates with a …

  • (PDF) Using recycled concrete aggregates in precast ...

    Among the construction waste that could be recycled, we can mention the aggregates resulting from crushed concrete. While the acquired knowledge about the use of recycled aggregates in new concrete mixes is fairly large, the use of such aggregates in

  • MAKING CONCRETE FROM RECYCLED MATERIALS

    MAKING CONCRETE FROM RECYCLED MATERIALS Researchers work toward developing reliable standards for the use of recycled concrete aggregates in new concrete. The Issue Making concrete out of recycled concrete aggregate, or RCA, can be a sustainable and cost-saving alternative to other aggregates. However, the quality of concrete made with

  • Precast products made of recycled concrete - Concrete ...

    The use of recycled aggregates for precast products made of vibrated concrete results in the following advantages: » The products are not reinforced. » The low degree of flow does not compromise the characteristics of the concrete.

  • Ways to Recycle and Reuse Concrete

    Jan 07, 2019· Recycled concrete can be used in many of the same ways as you would use new materials, such as gravel, paving materials, and aggregates. Permeable paving for walkways, driveways, and other outdoor hard surfaces: Broken concrete that is carefully laid creates a stable, porous traffic surface that rainwater can filter through.

  • Sustainable Construction: Use of Recycled Concrete Aggregate

    Jul 07, 2015· RECYCLING OF CONCRETE AT A PRECAST CONCRETE PLANT Authors: A van Acker. x. ... water absorption and freeze-thaw resistance. This paper describes the production method for recycled concrete aggregate, results of an experimental work undertaken, practical experience gained from the findings and the cost/benefits of recycling.

  • Service-Load Behavior of Precast/Prestressed Concrete ...

    This paper describes an experimental investigation on the use of recycled concrete aggregates (RCAs) as replacement for coarse natural aggregates (NAs) in precast/prestressed concrete struc-tures. Specifically, sustained service load tests were conducted on 18 pretensioned beams with two different levels of RCA (50%

  • Paving with Precast Concrete Made with Recycled Mixed ...

    widely used in construction, such as curbstones and paving blocks, using recycled concrete made with a 50% substitution of the natural gravel by recycled mixed aggregates with a significant ceramic content (>30%). In order to prove the quality of such mass concrete recycled precast elements, two

  • Decorative Precast Concrete Specialty Aggregate | Kafka ...

    Jan 28, 2021· Specialty Aggregates Crushed to Size for Decorative Precast Concrete Pavers & Amenities. With nearly 60 different colors of natural stone and recycled materials available in any size specification, Kafka Granite's precast concrete aggregates and manufactured sands insure that your company can produce perfectly colored precast concrete pavers, site furnishings, amenities, or …

  • Sustainability and Precast Concrete

    precast concrete members may be reused in other applications. Precast concrete is also friendly to downcycling, in which building materials are broken down, because it comes apart with a minimum amount of energy and retains its original qualities. An example of downcycling would be the use of crushed precast concrete as aggregate in new ...

  • Use of Recycled Concrete Aggregates in Precast/Prestressed ...

    Jan 01, 2016· This paper describes a preliminary investigation on factors related to the use of recycled concrete aggregates (RCA) in precast/prestressed concrete applications. In particular, the effects of RCA are experimentally investigated for: 1) the bond between seven-wire prestressing steel strand and concrete; 2) the compression strength gain of ...

  • (PDF) Use of Recycled Concrete Aggregates in Precast ...

    This paper describes an experimental investigation on the use of recycled concrete aggregates (RCAs) as replacement for coarse natural aggregates (NAs) in precast/prestressed concrete structures.

  • Recycle! - National Precast Concrete Association

    Jul 05, 2019· In 2010, StructureCast, a custom precast concrete manufacturer located in Bakersfield, Calif., opened a four-acre crushing and screening plant to recycle concrete and washout. Since opening, approximately 10,000 tons of concrete has been recycled every month.

  • What is Precast Concrete? | American Precast

    Where precast concrete starts to differ from regular concrete is in how it's made. Previously, cast-in concrete was built using forms, then having to pour the concrete, waiting for the concrete to cure, all while being done on-site. All of the raw materials have to be shipped to the project site. Precast concrete is not made on-site.

  • Precast concrete | YourHome

    Precast concrete elements can be crushed and reused as aggregate for new concrete or for road bases or construction fill, creating economic and environmental savings. Recycled aggregate and steel can and are commonly used in precast concrete. Designers should specify their inclusion to …

  • Recycling in the precast concrete industry | P. Francisco ...

    Some precast concrete plants manufacture products with recycled aggregates (RA) for many years. Part of them are gained by washing fresh concrete, but traditionally, RAs are got from concrete products after being tested under the factory production control or because a nonconformity is identified.

  • (PDF) Using recycled concrete aggregates in precast ...

    The use of bibliometric tools has allowed analysing, quantifying and visualising the conceptual and social aspects of the scientific field "precast concrete with recycled materials"; as well ...

  • Concrete Mix Design: Understanding Aggregate - NPCA - Precast

    Mar 02, 2018· Aggregate shape's effect on concrete quality. By Frank Bowen. Editor's Note: This is the second article in a year-long series that explores the science of concrete to provide a better understanding of mix design. The series will be collaboratively written by Paul Ramsburg, technical sales specialist at Sika Corp., and Frank Bowen, quality control manager at Piedmont Precast.

  • Using recycled concrete aggregates in precast concrete ...

    May 23, 2012· While the acquired knowledge about the use of recycled aggregates in new concrete mixes is fairly large, the use of such aggregates in the production of concrete blocks is very limited. This research aims to study the influence of the use of recycled aggregates in precast concrete hollow blocks on their compressive strength.

  • End of life recycling - concretecentre.com

    A specific subset of recycled aggregates is recycled concrete aggregates (RCA) where the masonry content is limited to not more than five per cent. The performance characteristics of RCA are better than RA and consequently there are fewer restrictions on the use of RCA in concrete. Provision for the use of RCA in concrete is given in BS 8500-2.

  • (PDF) Use of recycled concrete aggregate in high-strength ...

    Materials and Structures/Mat&iaux et Constructions,Vol. 33, November 2000, pp 574-580 Use of recycled concrete aggregate in high-strength concrete M. C. Limbachiya, T. Leelawat and R. K. Dhir Concrete TechnologyUnit, Departmentof Civil Engineering, Universityof Dundee, DundeeDD1 4HN, Scotland, UK Paper received:February25, 2000; Paperaccepted:April 17, 2000 A B S T R A C T R 14 …

  • Precast Concrete Aggregates & Manufactured Sands | Kafka ...

    Specialty Aggregates Crushed to Size for Architectural & Decorative Precast Concrete. Kafka Granite, LLC produces more than 60 different types of crushed Granite, Quartz, Marble, and Recycled Materials for use in precast concrete products. Our specialty aggregates and manufactured sands can be crushed and screened to meet any size specification ...

  • Use of recycled concrete aggregate in high-strength ...

    The results of a test programme to study the use of recycled concrete aggregate (RCA) in high-strength, 50 N/mm2 or greater, concrete are described. The effects of coarse RCA content on the ceiling strength, bulk engineering and durability properties of such concretes have been established. The results showed that up to 30% coarse RCA had no effect on concrete strength, but therafter there was ...

  • Effect of recycled concrete aggregates on strength and ...

    aggregates, such as crushed limestone and gravel, while the demolition of old concrete structures offers significant sourc-es of recycled concrete aggregate (RCA). Currently, RCA use in the United States is largely limited to nonstructural applications, such as road base. Uncertainty and variability

  • Use of RECYCLED AGGREGATES In CONCRETE- A Paradigm Shift

    The extensive research on recycled concrete aggregate and recycled aggregate concrete (RAC) as started from year 1945 in various part of the world after second world war, but in a fragmented manner. First effort has been made by Nixon in 1977 who complied all the work on recycled aggregate carried out between 1945-1977 and prepared a state-of ...