Peter Rem - Academia.edu (original) (raw)
Papers by Peter Rem
Journal of Environmental Protection, 2016
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Powder Technology, Jun 1, 2021
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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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De Gruyter eBooks, Dec 31, 1986
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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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Magnetic and Electrical Separation, 2000
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Construction and Building Materials, Apr 1, 2017
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International Journal of Mineral Processing, Aug 1, 1998
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International Journal of Mineral Processing, 2004
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Physical Separation in Science and Engineering, 2004
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IEEE Transactions on Magnetics, Mar 1, 1985
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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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Magnetic and Electrical Separation, 1999
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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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IEEE Transactions on Magnetics, Jul 1, 1998
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Environmental Pollution, Dec 1, 2002
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Magnetic and Electrical Separation, 1998
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Minerals Engineering, 2002
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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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Journal of Environmental Protection, 2016
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Powder Technology, Jun 1, 2021
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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
De Gruyter eBooks, Dec 31, 1986
Bookmarks Related papers MentionsView impact
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
Magnetic and Electrical Separation, 2000
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Construction and Building Materials, Apr 1, 2017
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International Journal of Mineral Processing, Aug 1, 1998
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International Journal of Mineral Processing, 2004
Bookmarks Related papers MentionsView impact
Physical Separation in Science and Engineering, 2004
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IEEE Transactions on Magnetics, Mar 1, 1985
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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
Magnetic and Electrical Separation, 1999
Bookmarks Related papers MentionsView impact
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
IEEE Transactions on Magnetics, Jul 1, 1998
Bookmarks Related papers MentionsView impact
Bookmarks Related papers MentionsView impact
Environmental Pollution, Dec 1, 2002
Bookmarks Related papers MentionsView impact
Magnetic and Electrical Separation, 1998
Bookmarks Related papers MentionsView impact
Minerals Engineering, 2002
Bookmarks Related papers MentionsView impact
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