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Fly ash-slag based Geopolymer cement (GPC) has demonstrated mechanical properties and environment... more Fly ash-slag based Geopolymer cement (GPC) has demonstrated mechanical properties and environmental advantages that make it one of predominant sustainable alternatives to Portland cement (PC). Despite the fact that numerous environmental analyses about geopolymers are being published, their environmental impact after the end of service-life has barely been explored. Given that construction-waste management is a major sustainability issue, the present study is investigating the potential of recycling fly ash-slag GPC as a fine aggregate in mortar mixes. The major physical properties of the fine recycled aggregates (FRA) were tested and compared to those of PC FRA and natural sand of similar fineness. The effect of incorporating FRA in low (25%) and high (50%) percentage in PC or GPC matrix mortars was investigated. The 28day compressive and flexural strength of mortars were tested. Also the 28day water absorption and flow of mixes incorporating GPC FRA were recorded. GPC FRA exhibite...
Original and reproduced data used to plot figures in the review article "Healthy Architectur... more Original and reproduced data used to plot figures in the review article "Healthy Architecture: promoting physical activity through building design"
Napoleana-Anna Chaliasou, BRE Centre for Innovative Construction Materials, Department of Archite... more Napoleana-Anna Chaliasou, BRE Centre for Innovative Construction Materials, Department of Architecture and Civil Engineering, University of Bath, United Kingdom nac32@bath.ac.uk Andrew Heath, BRE Centre for Innovative Construction Materials, Department of Architecture and Civil Engineering, University of Bath, United Kingdom Kevin Paine, BRE Centre for Innovative Construction Materials, Department of Architecture and Civil Engineering, University of Bath, United Kingdom Juliana Calabria Holley, BRE Centre for Innovative Construction Materials, Department of Architecture and Civil Engineering, University of Bath, United Kingdom
The future sustainable built environment focuses mainly on environmental conservation and technol... more The future sustainable built environment focuses mainly on environmental conservation and technological innovation and development. However, with infrastructure development, the consumption of raw materials such as cement, gypsum, sand, and stones increases. Therefore, use of industrial waste as raw material in construction shall be proposed as a sustainable and environment friendly alternative. Also, the higher demand for mineral commodities have led to increased mining and hence increased mining waste. The mine tailings being the wastes from rocks and minerals processing, are generally rich in Si, Ca, Al, Mg, and Fe, and also have considerable amounts of heavy metals and metalloids such as Pb, As, Co, Cu, Zn, V, and Cr. When tailings contain sulphide minerals, it may also lead to acid mine drainage. This makes the effective and efficient recycling and reuse of mine waste a major environmental concern. However, the physical, mineralogical and chemical composition of the mine tailin...
General rights Copyright and moral rights for the publications made accessible in the public port... more General rights Copyright and moral rights for the publications made accessible in the public portal are retained by the authors and/or other copyright owners and it is a condition of accessing publications that users recognise and abide by the legal requirements associated with these rights. Take down policy If you believe that this document breaches copyright please contact us providing details, and we will remove access to the work immediately and investigate your claim.
Fly ash-slag based Geopolymer Cement (GPC) is presenting mechanical properties and environmental ... more Fly ash-slag based Geopolymer Cement (GPC) is presenting mechanical properties and environmental advantages that make it the predominant "green" alternative to Portland Cement (PC). Although numerous life-cycle analyses praising its environmental advantages, disposal after the end of its life remains as an issue that has been barely explored. The present study is investigating the recyclability of fly ash-slag GPC as aggregate in mortars. The purpose of the study was to evaluate the effect of GPC fine Recycled Aggregates (RA), at replacement levels of 25% and 50%, on the main mechanical properties of PC and GPC mortar mixes. The results were compared with those obtained by corresponding mixes incorporating natural and PC-RA. The main physical properties of GPC-RA were examined and proven to be comparable to those of PC-RA and slightly inferior to those of natural sand. A negligible effect was observed at 28-day compressive and flexural strength of PC mortars with GPC aggre...
Advances in Cement Research, Sep 1, 2018
Geopolymer cements are alternative binders for concrete with low CO2 footprint and distinct chemi... more Geopolymer cements are alternative binders for concrete with low CO2 footprint and distinct chemical composition. They consist of aluminosilicate macromolecules and have a highly alkaline matrix due to the activating solutions used for their production. This paper is based on a study examining the recyclability of fly ash-slag based geopolymer paste as fine recycled concrete aggregate (RCA) in Portland cement and geopolymer mortars. Given the intrinsic structure of geopolymers, leaching of chemical substances from the RCA into the new paste was considered possible. SEM images and elemental mapping of the hardened mortars were used to evaluate the effect of RA. The potential of alkali silica reaction occurrence and the effect of RA extract on the initial setting time of cement were examined. Materials in kg/m 3 Mix PC NA RA Water PC_100%NA 960 2160-451 PC_25%PC 960 1620 1080 451 PC_50%PC 960 1080 540 451 PC_25%GPC 960 1620 1080 451 PC_50%GPC 960 1080 540 451
Fly ash-slag based Geopolymer cement (GPC) has demonstrated mechanical properties and environment... more Fly ash-slag based Geopolymer cement (GPC) has demonstrated mechanical properties and environmental advantages that make it one of predominant sustainable alternatives to Portland cement (PC). Despite the fact that numerous environmental analyses about geopolymers are being published, their environmental impact after the end of service-life has barely been explored. Given that construction-waste management is a major sustainability issue, the present study is investigating the potential of recycling fly ash-slag GPC as a fine aggregate in mortar mixes. The major physical properties of the fine recycled aggregates (FRA) were tested and compared to those of PC FRA and natural sand of similar fineness. The effect of incorporating FRA in low (25%) and high (50%) percentage in PC or GPC matrix mortars was investigated. The 28day compressive and flexural strength of mortars were tested. Also the 28day water absorption and flow of mixes incorporating GPC FRA were recorded. GPC FRA exhibite...
Original and reproduced data used to plot figures in the review article "Healthy Architectur... more Original and reproduced data used to plot figures in the review article "Healthy Architecture: promoting physical activity through building design"
Napoleana-Anna Chaliasou, BRE Centre for Innovative Construction Materials, Department of Archite... more Napoleana-Anna Chaliasou, BRE Centre for Innovative Construction Materials, Department of Architecture and Civil Engineering, University of Bath, United Kingdom nac32@bath.ac.uk Andrew Heath, BRE Centre for Innovative Construction Materials, Department of Architecture and Civil Engineering, University of Bath, United Kingdom Kevin Paine, BRE Centre for Innovative Construction Materials, Department of Architecture and Civil Engineering, University of Bath, United Kingdom Juliana Calabria Holley, BRE Centre for Innovative Construction Materials, Department of Architecture and Civil Engineering, University of Bath, United Kingdom
The future sustainable built environment focuses mainly on environmental conservation and technol... more The future sustainable built environment focuses mainly on environmental conservation and technological innovation and development. However, with infrastructure development, the consumption of raw materials such as cement, gypsum, sand, and stones increases. Therefore, use of industrial waste as raw material in construction shall be proposed as a sustainable and environment friendly alternative. Also, the higher demand for mineral commodities have led to increased mining and hence increased mining waste. The mine tailings being the wastes from rocks and minerals processing, are generally rich in Si, Ca, Al, Mg, and Fe, and also have considerable amounts of heavy metals and metalloids such as Pb, As, Co, Cu, Zn, V, and Cr. When tailings contain sulphide minerals, it may also lead to acid mine drainage. This makes the effective and efficient recycling and reuse of mine waste a major environmental concern. However, the physical, mineralogical and chemical composition of the mine tailin...
General rights Copyright and moral rights for the publications made accessible in the public port... more General rights Copyright and moral rights for the publications made accessible in the public portal are retained by the authors and/or other copyright owners and it is a condition of accessing publications that users recognise and abide by the legal requirements associated with these rights. Take down policy If you believe that this document breaches copyright please contact us providing details, and we will remove access to the work immediately and investigate your claim.
Fly ash-slag based Geopolymer Cement (GPC) is presenting mechanical properties and environmental ... more Fly ash-slag based Geopolymer Cement (GPC) is presenting mechanical properties and environmental advantages that make it the predominant "green" alternative to Portland Cement (PC). Although numerous life-cycle analyses praising its environmental advantages, disposal after the end of its life remains as an issue that has been barely explored. The present study is investigating the recyclability of fly ash-slag GPC as aggregate in mortars. The purpose of the study was to evaluate the effect of GPC fine Recycled Aggregates (RA), at replacement levels of 25% and 50%, on the main mechanical properties of PC and GPC mortar mixes. The results were compared with those obtained by corresponding mixes incorporating natural and PC-RA. The main physical properties of GPC-RA were examined and proven to be comparable to those of PC-RA and slightly inferior to those of natural sand. A negligible effect was observed at 28-day compressive and flexural strength of PC mortars with GPC aggre...
Advances in Cement Research, Sep 1, 2018
Geopolymer cements are alternative binders for concrete with low CO2 footprint and distinct chemi... more Geopolymer cements are alternative binders for concrete with low CO2 footprint and distinct chemical composition. They consist of aluminosilicate macromolecules and have a highly alkaline matrix due to the activating solutions used for their production. This paper is based on a study examining the recyclability of fly ash-slag based geopolymer paste as fine recycled concrete aggregate (RCA) in Portland cement and geopolymer mortars. Given the intrinsic structure of geopolymers, leaching of chemical substances from the RCA into the new paste was considered possible. SEM images and elemental mapping of the hardened mortars were used to evaluate the effect of RA. The potential of alkali silica reaction occurrence and the effect of RA extract on the initial setting time of cement were examined. Materials in kg/m 3 Mix PC NA RA Water PC_100%NA 960 2160-451 PC_25%PC 960 1620 1080 451 PC_50%PC 960 1080 540 451 PC_25%GPC 960 1620 1080 451 PC_50%GPC 960 1080 540 451