Peter Rem - Academia.edu (original) (raw)

Papers by Peter Rem

Research paper thumbnail of Recycling of End of Life Concrete Fines into Hardened Cement and Clean Sand

Journal of Environmental Protection, 2016

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Research paper thumbnail of Non-overlapping coverage in random feeding

Powder Technology, Jun 1, 2021

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Research paper thumbnail of The future of concrete

Abstract only. - After a decade of intensive research into the recycling of End-of-Life (EOL) con... more Abstract only. - After a decade of intensive research into the recycling of End-of-Life (EOL) concrete into high-grade new concrete, largely supported by funding from the European Commission, it appears that a circular economy for concrete is techno-economically feasible. A collection of advanced technologies, in particular smart demolition for clean mono-flows of EOL concrete, new attrition and classification processes for removing the fine, moist-, lights- and cementrich fraction from coarser aggregates, sensor sorters for removing larger pieces of wood, plastics and metals from recycle aggregate, green thermal treatment for concentrating and purifying the EOL cement paste and Laser-Induced Breakdown Spectroscopy tools for verifying the quality of input materials for the mortar facilities, have been put into place to make recycled concrete in some technical aspects even superior to concrete made from river gravel. And at competitive costs. Is this enough to make the transition to circular concrete into a success? Not necessarily. The integration of circular concrete into the routine of construction requires new procedures and agreements between stakeholders to avoid risks in producing an extremely cheap but at the same time strongly quality-guaranteed concrete commodity from a new and variable feedstock. It is argued that extremely tight quality checks should be installed in combination with a commitment of the entire chain to gently increase the fraction of recycled materials into new concrete as the EOL concrete flow grows as a consequence of phasing out buildings from the post-war boom.

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Research paper thumbnail of Effect of a Superconducting Cylinder on the Squid-Magnetometer Signal from a Magnetic Dipole

De Gruyter eBooks, Dec 31, 1986

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Research paper thumbnail of Recycling of End of Life Concrete Fines (0–4 mm) from Waste to Valuable Resources

Springer eBooks, Aug 6, 2017

End of Life (EOL) concrete fines, that is often 0–4 m, is one of the massive by-products of concr... more End of Life (EOL) concrete fines, that is often 0–4 m, is one of the massive by-products of concrete recycling. Using this fraction into new concrete is detrimental, due to its high water absorption and mixed contaminants. Although the construction sector is to some extent familiar with the utilization of the coarse fraction of crushed concrete, at present there is no high-quality application for crushed concrete fines. Here we present an effective recycling process on lab scale to separate the cementitious powder from the sandy part in the crushed concrete fines and deliver attractive products with the minimum amount of contaminants. For this study, a lab scale Heating-Air classification System (HAS) was designed and constructed. A combination of heat and air classification, resulted in a proper separation of finer fraction (0–0.250 mm), from coarser fractions. Heating of the materials was followed by ball milling to enhance the liberation of the cementitious fraction. Experiments were carried out at different heating temperatures and milling durations. Experimental results show that by heating the materials to 500 °C for 30 s, the required time of ball milling is diminished by a factor of three and the quality of the recycling products satisfies the market demand. In addition, the removal of contaminants is complete at 500 °C. The amount of CaO in the recovered finer fraction from the recycling process is comparable with the amount of CaO in low-quality limestone. By using this fraction in the cement kiln as the replacement of limestone, the release of the chemically bound CO2 could be reduced by a factor of three. This proof of concept constitutes the starting point for the new HAS technology proposed in the Horizon 2020 VEEP project.

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Research paper thumbnail of The Investigation of Separability of Particles Smaller Than 5mm by Eddy-Current Separation Technology – Part II: Novel Design Concepts

Magnetic and Electrical Separation, 2000

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Research paper thumbnail of An experimental study on the relation between input variables and output quality of a new concrete recycling process

Construction and Building Materials, Apr 1, 2017

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Research paper thumbnail of Improved method for prediction of heavy metal recoveries from soil using high intensity magnetic separation (HIMS)

International Journal of Mineral Processing, Aug 1, 1998

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Research paper thumbnail of Modelling the throw of metals and nonmetals in eddy current separations

International Journal of Mineral Processing, 2004

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Research paper thumbnail of Eddy Current Separation of Fine Non-Ferrous Particles from Bulk Streams

Physical Separation in Science and Engineering, 2004

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Research paper thumbnail of A.C. loss contributions of the transport current and transverse field caused by combined action in a multifilamentary wire

IEEE Transactions on Magnetics, Mar 1, 1985

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Research paper thumbnail of Aluminium alloys in municipal solid waste incineration bottom ash

Waste Management & Research, May 1, 2009

With the increasing growth of incineration of household waste, more and more aluminium is retaine... more With the increasing growth of incineration of household waste, more and more aluminium is retained in municipal solid waste incinerator bottom ash. Therefore recycling of aluminium from bottom ash becomes increasingly important. Previous research suggests that aluminium from different sources is found in different size fractions resulting in different recycling rates. The purpose of this study was to develop analytical and sampling techniques to measure the particle size distribution of individual alloys in bottom ash. In particular, cast aluminium alloys were investigated. Based on the particle size distribution it was computed how well these alloys were recovered in a typical state-of-the-art treatment plant. Assessment of the cast alloy distribution was carried out by wet physical separation processes, as well as chemical methods, X-ray fluorescence analysis and electron microprobe analysis. The results from laboratory analyses showed that cast alloys tend to concentrate in the coarser fractions and therefore are better recovered in bottom ash treatment plants.

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Research paper thumbnail of The Investigation of Separability of Particles Smaller Than 5 mm by Eddy Current Separation Technology. Part I: Rotating Type Eddy Current Separators

Magnetic and Electrical Separation, 1999

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Research paper thumbnail of Particle trajectory simulation of two-drum eddy current separators

Resources Conservation and Recycling, May 1, 1999

Particle trajectories of the newly-developed two-drum eddy current separators are simulated by th... more Particle trajectories of the newly-developed two-drum eddy current separators are simulated by the ECSIM software package. The simulation results have been substantiated by measuring the horizontal displacements of the particles to be investigated under the same conditions. It is shown that the simulation results are in good agreement with the experimental ones. Further, on the basis of the simulation results

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Research paper thumbnail of Simulation of eddy-current separators

IEEE Transactions on Magnetics, Jul 1, 1998

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Research paper thumbnail of A Circular Economy Index to promote Innovation in Recycling

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Research paper thumbnail of A decision support system for wet soil cleaning

Environmental Pollution, Dec 1, 2002

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Research paper thumbnail of Grade and Recovery Prediction for Eddy Current Separation Processes

Magnetic and Electrical Separation, 1998

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Research paper thumbnail of Dry Magnus separation

Minerals Engineering, 2002

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Research paper thumbnail of Improve the quality of construction and demolition waste by separation techniques

Publisher Summary Each year about 16 million tons of construction and demolition waste (CDW) is p... more Publisher Summary Each year about 16 million tons of construction and demolition waste (CDW) is produced in the Netherlands, which locally is the largest solid waste stream. Currently, about 90% (by weight) of construction and demolition waste is being reused. However, most of it is reused in road foundations, and embankments, therefore, construction and demolition waste is still recycled in relatively low technical applications. In order to recycle CDW at a high technical level, the two main materials from CDW—concrete rubble and brick (masonry) rubble—should be recycled/reused in the concrete industry and in the brick industry respectively, and proper quality control is an important step to ensure qualified products without environmental risks. This chapter investigates effective separation techniques used to improve the quality of CDW, based on differences in physical properties and chemical compositions between concrete/mortar and brick. Both dry and wet separation techniques are used to obtain concentrates of concrete/mortar rubble, and brick rubble. The results show that magnetic separation, jigging, spiral separation, and color separation can be successfully applied for treating construction and demolition waste, and clean products obtained finally are satisfactory.

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Research paper thumbnail of Recycling of End of Life Concrete Fines into Hardened Cement and Clean Sand

Journal of Environmental Protection, 2016

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Research paper thumbnail of Non-overlapping coverage in random feeding

Powder Technology, Jun 1, 2021

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Research paper thumbnail of The future of concrete

Abstract only. - After a decade of intensive research into the recycling of End-of-Life (EOL) con... more Abstract only. - After a decade of intensive research into the recycling of End-of-Life (EOL) concrete into high-grade new concrete, largely supported by funding from the European Commission, it appears that a circular economy for concrete is techno-economically feasible. A collection of advanced technologies, in particular smart demolition for clean mono-flows of EOL concrete, new attrition and classification processes for removing the fine, moist-, lights- and cementrich fraction from coarser aggregates, sensor sorters for removing larger pieces of wood, plastics and metals from recycle aggregate, green thermal treatment for concentrating and purifying the EOL cement paste and Laser-Induced Breakdown Spectroscopy tools for verifying the quality of input materials for the mortar facilities, have been put into place to make recycled concrete in some technical aspects even superior to concrete made from river gravel. And at competitive costs. Is this enough to make the transition to circular concrete into a success? Not necessarily. The integration of circular concrete into the routine of construction requires new procedures and agreements between stakeholders to avoid risks in producing an extremely cheap but at the same time strongly quality-guaranteed concrete commodity from a new and variable feedstock. It is argued that extremely tight quality checks should be installed in combination with a commitment of the entire chain to gently increase the fraction of recycled materials into new concrete as the EOL concrete flow grows as a consequence of phasing out buildings from the post-war boom.

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Effect of a Superconducting Cylinder on the Squid-Magnetometer Signal from a Magnetic Dipole

De Gruyter eBooks, Dec 31, 1986

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Recycling of End of Life Concrete Fines (0–4 mm) from Waste to Valuable Resources

Springer eBooks, Aug 6, 2017

End of Life (EOL) concrete fines, that is often 0–4 m, is one of the massive by-products of concr... more End of Life (EOL) concrete fines, that is often 0–4 m, is one of the massive by-products of concrete recycling. Using this fraction into new concrete is detrimental, due to its high water absorption and mixed contaminants. Although the construction sector is to some extent familiar with the utilization of the coarse fraction of crushed concrete, at present there is no high-quality application for crushed concrete fines. Here we present an effective recycling process on lab scale to separate the cementitious powder from the sandy part in the crushed concrete fines and deliver attractive products with the minimum amount of contaminants. For this study, a lab scale Heating-Air classification System (HAS) was designed and constructed. A combination of heat and air classification, resulted in a proper separation of finer fraction (0–0.250 mm), from coarser fractions. Heating of the materials was followed by ball milling to enhance the liberation of the cementitious fraction. Experiments were carried out at different heating temperatures and milling durations. Experimental results show that by heating the materials to 500 °C for 30 s, the required time of ball milling is diminished by a factor of three and the quality of the recycling products satisfies the market demand. In addition, the removal of contaminants is complete at 500 °C. The amount of CaO in the recovered finer fraction from the recycling process is comparable with the amount of CaO in low-quality limestone. By using this fraction in the cement kiln as the replacement of limestone, the release of the chemically bound CO2 could be reduced by a factor of three. This proof of concept constitutes the starting point for the new HAS technology proposed in the Horizon 2020 VEEP project.

Bookmarks Related papers MentionsView impact

Research paper thumbnail of The Investigation of Separability of Particles Smaller Than 5mm by Eddy-Current Separation Technology – Part II: Novel Design Concepts

Magnetic and Electrical Separation, 2000

Bookmarks Related papers MentionsView impact

Research paper thumbnail of An experimental study on the relation between input variables and output quality of a new concrete recycling process

Construction and Building Materials, Apr 1, 2017

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Improved method for prediction of heavy metal recoveries from soil using high intensity magnetic separation (HIMS)

International Journal of Mineral Processing, Aug 1, 1998

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Modelling the throw of metals and nonmetals in eddy current separations

International Journal of Mineral Processing, 2004

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Eddy Current Separation of Fine Non-Ferrous Particles from Bulk Streams

Physical Separation in Science and Engineering, 2004

Bookmarks Related papers MentionsView impact

Research paper thumbnail of A.C. loss contributions of the transport current and transverse field caused by combined action in a multifilamentary wire

IEEE Transactions on Magnetics, Mar 1, 1985

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Aluminium alloys in municipal solid waste incineration bottom ash

Waste Management & Research, May 1, 2009

With the increasing growth of incineration of household waste, more and more aluminium is retaine... more With the increasing growth of incineration of household waste, more and more aluminium is retained in municipal solid waste incinerator bottom ash. Therefore recycling of aluminium from bottom ash becomes increasingly important. Previous research suggests that aluminium from different sources is found in different size fractions resulting in different recycling rates. The purpose of this study was to develop analytical and sampling techniques to measure the particle size distribution of individual alloys in bottom ash. In particular, cast aluminium alloys were investigated. Based on the particle size distribution it was computed how well these alloys were recovered in a typical state-of-the-art treatment plant. Assessment of the cast alloy distribution was carried out by wet physical separation processes, as well as chemical methods, X-ray fluorescence analysis and electron microprobe analysis. The results from laboratory analyses showed that cast alloys tend to concentrate in the coarser fractions and therefore are better recovered in bottom ash treatment plants.

Bookmarks Related papers MentionsView impact

Research paper thumbnail of The Investigation of Separability of Particles Smaller Than 5 mm by Eddy Current Separation Technology. Part I: Rotating Type Eddy Current Separators

Magnetic and Electrical Separation, 1999

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Particle trajectory simulation of two-drum eddy current separators

Resources Conservation and Recycling, May 1, 1999

Particle trajectories of the newly-developed two-drum eddy current separators are simulated by th... more Particle trajectories of the newly-developed two-drum eddy current separators are simulated by the ECSIM software package. The simulation results have been substantiated by measuring the horizontal displacements of the particles to be investigated under the same conditions. It is shown that the simulation results are in good agreement with the experimental ones. Further, on the basis of the simulation results

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Simulation of eddy-current separators

IEEE Transactions on Magnetics, Jul 1, 1998

Bookmarks Related papers MentionsView impact

Research paper thumbnail of A Circular Economy Index to promote Innovation in Recycling

Bookmarks Related papers MentionsView impact

Research paper thumbnail of A decision support system for wet soil cleaning

Environmental Pollution, Dec 1, 2002

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Grade and Recovery Prediction for Eddy Current Separation Processes

Magnetic and Electrical Separation, 1998

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Dry Magnus separation

Minerals Engineering, 2002

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Improve the quality of construction and demolition waste by separation techniques

Publisher Summary Each year about 16 million tons of construction and demolition waste (CDW) is p... more Publisher Summary Each year about 16 million tons of construction and demolition waste (CDW) is produced in the Netherlands, which locally is the largest solid waste stream. Currently, about 90% (by weight) of construction and demolition waste is being reused. However, most of it is reused in road foundations, and embankments, therefore, construction and demolition waste is still recycled in relatively low technical applications. In order to recycle CDW at a high technical level, the two main materials from CDW—concrete rubble and brick (masonry) rubble—should be recycled/reused in the concrete industry and in the brick industry respectively, and proper quality control is an important step to ensure qualified products without environmental risks. This chapter investigates effective separation techniques used to improve the quality of CDW, based on differences in physical properties and chemical compositions between concrete/mortar and brick. Both dry and wet separation techniques are used to obtain concentrates of concrete/mortar rubble, and brick rubble. The results show that magnetic separation, jigging, spiral separation, and color separation can be successfully applied for treating construction and demolition waste, and clean products obtained finally are satisfactory.

Bookmarks Related papers MentionsView impact