The Experts below are selected from a list of 324 Experts worldwide ranked by ideXlab platform
Moises Frias - One of the best experts on this subject based on the ideXlab platform.
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Rheological and calorimetric behaviour of Cements blended with containing ceramic sanitary ware and construction/demolition waste
Construction and Building Materials, 2013Co-Authors: César Medina, M.i. Sánchez De Rojas, Phillip Frank Gower Banfill, Moises FriasAbstract:Abstract This research paper analyses the behaviour of new blended Cements containing 10% and 20% ceramic sanitary ware (SW) and construction and demolition waste (C&DW) to determine their suitability as future supplementary Cementitious materials for commercial Cement Manufacture. The effects of these recycled materials on Cement rheology and heat conductivity were studied and an analysis of covariance was run to quantify the impact of each factor and co-variable involved on rheological properties. The addition of ceramic waste reduced shear yield stress and retarded the hydration reactions, whereas construction and demolition waste (C&DW) had the opposite effect, raising yield stress and accelerating hydration kinetics. These behavioural differences between the two types of industrial waste would have a direct effect on the final applications of the resulting blended Cement.
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Characterization of Algerian reservoir sludges for use as active additions in Cement: New pozzolans for eco-Cement Manufacture
Construction and Building Materials, 2013Co-Authors: O Rodriguez, Aurora López-delgado, Larbi Kacimi, Moises Frias, A GuerreroAbstract:Abstract This paper analyzes the chemical, physical, morphological, mineralogical and pozzolanic characteristics of several reservoir sludges and assesses their potential for use as 20% additions in blended Cement Manufacture. The studied sludges exhibit good pozzolanic properties, especially sample 5 which has high SiO 2 , Al 2 O 3 and Fe 2 O 3 contents. Blended Cements prepared with 20% sludge additions complied with the European standard on compressive strength of one of the standardized Cements, above 32.5 MPa at 28 days of curing; except for sample 5, which showed similar compressive strength values to the reference Cement and up to 2% higher values at long curing times.
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rheological and calorimetric behaviour of Cements blended with containing ceramic sanitary ware and construction demolition waste
Construction and Building Materials, 2013Co-Authors: César Medina, Phillip Frank Gower Banfill, M Sanchez I De Rojas, Moises FriasAbstract:Abstract This research paper analyses the behaviour of new blended Cements containing 10% and 20% ceramic sanitary ware (SW) and construction and demolition waste (C&DW) to determine their suitability as future supplementary Cementitious materials for commercial Cement Manufacture. The effects of these recycled materials on Cement rheology and heat conductivity were studied and an analysis of covariance was run to quantify the impact of each factor and co-variable involved on rheological properties. The addition of ceramic waste reduced shear yield stress and retarded the hydration reactions, whereas construction and demolition waste (C&DW) had the opposite effect, raising yield stress and accelerating hydration kinetics. These behavioural differences between the two types of industrial waste would have a direct effect on the final applications of the resulting blended Cement.
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brazilian sugar cane bagasse ashes from the cogeneration industry as active pozzolans for Cement Manufacture
Cement & Concrete Composites, 2011Co-Authors: Moises Frias, Ernesto Villar, Holmer SavastanoAbstract:For proper management of wastes and their possible recycling as raw materials, complete characterization of the materials is necessary to evaluate the main scientific aspects and potential applications. The current paper presents a detailed scientific study of different Brazilian sugar cane bagasse ashes from the cogeneration industry as alternative Cementing materials (active addition) for Cement Manufacture. The results show that the ashes from the industrial process (filter and bottom ones) present different chemical and mineralogical compositions and pozzolanic properties as well. As a consequence of its nature, the kinetic rate constant (K) states that the pozzolanic activity is null for the bottom ash and very low for the filter ash with respect to a sugar cane bagasse ash obtained in the laboratory under controlled burning conditions (reference). The scarce pozzolanic activity showed by ashes could be related to a possible contamination of bagasse wastes (with soils) before their use as alternative combustibles. For this reason, an optimization process for these wastes is advisable, if the ashes are to be used as pozzolans.
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The effect of curing temperature on white Cement hydration
Construction and Building Materials, 2009Co-Authors: Sagrario Martínez-ramírez, Moises FriasAbstract:Abstract Cement Manufacture has undergone extensive change in its attempts to rise to the successive challenges posed by society. The hydration of Portland Cement is a complex phenomenon that depends on both reagent characteristics and reaction conditions. It is a well-known fact that the curing temperature plays an important role on the hydration kinetics. The present study is the first to be undertaken on the effect of curing temperature on white Portland Cement paste hydration over long hydration times (365 days at 20 °C and 124 days at 60 °C). The technique used, 29Si and 27Al NMR spectroscopy, is particularly well adapted to the study of Cement hydration. White Cement hydration generates a C–S–H gel in which the aluminium taken up forms bridge bonds. After nine days at 60 °C, the degree of reaction expressed in terms of the Al(IV)/Al(VI) ratio nearly doubles the value found after 90 days at 20 °C.
C Mansilla - One of the best experts on this subject based on the ideXlab platform.
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chemical recycling of carbon dioxide emissions from a Cement plant into dimethyl ether a case study of an integrated process in france using a reverse water gas shift rwgs step
International Journal of Hydrogen Energy, 2013Co-Authors: Phuangphe Vibhatavata, Jeanmarc Orgard, Michel Tabara, Daniel Ianchi, C MansillaAbstract:Abstract Recycling of carbon dioxide (CO2) and hydrogen (H2) into liquid fuel technology has recently gained wide public interest since it is a potential pathway to increase the liquid fuel supply and to mitigate CO2 emissions simultaneously. In France, the majority of the electricity production is derived from nuclear and renewable energy which have a low CO2 footprint. This electricity power enables a potential for massive hydrogen production with low carbon emissions. We studied the possibility to develop this technology at an industrial scale in the French context on a typical industrial example of a Cement Manufacture in the south of France. An integrated process is proposed, which enables the use of the heat released by the CO2 to fuel process to help to capture the CO2 released by the Cement Manufacture. Some technological issues are discussed, and a potential solution is proposed for the catalyst used in the critical step of the Reverse Water Gas-Shift reaction (RWGS) of the process.
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Chemical recycling of carbon dioxide emissions from a Cement plant into dimethyl ether, a case study of an integrated process in France using a Reverse Water Gas Shift (RWGS) step
International Journal of Hydrogen Energy, 2013Co-Authors: Phuangphe Vibhatavata, J. M. Borgard, M. Tabarant, D. Bianchi, C MansillaAbstract:Recycling of carbon dioxide (CO2) and hydrogen (H-2) into liquid fuel technology has recently gained wide public interest since it is a potential pathway to increase the liquid fuel supply and to mitigate CO2 emissions simultaneously. In France, the majority of the electricity production is derived from nuclear and renewable energy which have a low CO2 footprint. This electricity power enables a potential for massive hydrogen production with low carbon emissions. We studied the possibility to develop this technology at an industrial scale in the French context on a typical industrial example of a Cement Manufacture in the south of France. An integrated process is proposed, which enables the use of the heat released by the CO2 to fuel process to help to capture the CO2 released by the Cement Manufacture. Some technological issues are discussed, and a potential solution is proposed for the catalyst used in the critical step of the Reverse Water Gas-Shift reaction (RWGS) of the process. Copyright (C) 2013, Hydrogen Energy Publications, LLC. Published by Elsevier Ltd. All rights reserved.
Phuangphe Vibhatavata - One of the best experts on this subject based on the ideXlab platform.
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chemical recycling of carbon dioxide emissions from a Cement plant into dimethyl ether a case study of an integrated process in france using a reverse water gas shift rwgs step
International Journal of Hydrogen Energy, 2013Co-Authors: Phuangphe Vibhatavata, Jeanmarc Orgard, Michel Tabara, Daniel Ianchi, C MansillaAbstract:Abstract Recycling of carbon dioxide (CO2) and hydrogen (H2) into liquid fuel technology has recently gained wide public interest since it is a potential pathway to increase the liquid fuel supply and to mitigate CO2 emissions simultaneously. In France, the majority of the electricity production is derived from nuclear and renewable energy which have a low CO2 footprint. This electricity power enables a potential for massive hydrogen production with low carbon emissions. We studied the possibility to develop this technology at an industrial scale in the French context on a typical industrial example of a Cement Manufacture in the south of France. An integrated process is proposed, which enables the use of the heat released by the CO2 to fuel process to help to capture the CO2 released by the Cement Manufacture. Some technological issues are discussed, and a potential solution is proposed for the catalyst used in the critical step of the Reverse Water Gas-Shift reaction (RWGS) of the process.
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Chemical recycling of carbon dioxide emissions from a Cement plant into dimethyl ether, a case study of an integrated process in France using a Reverse Water Gas Shift (RWGS) step
International Journal of Hydrogen Energy, 2013Co-Authors: Phuangphe Vibhatavata, J. M. Borgard, M. Tabarant, D. Bianchi, C MansillaAbstract:Recycling of carbon dioxide (CO2) and hydrogen (H-2) into liquid fuel technology has recently gained wide public interest since it is a potential pathway to increase the liquid fuel supply and to mitigate CO2 emissions simultaneously. In France, the majority of the electricity production is derived from nuclear and renewable energy which have a low CO2 footprint. This electricity power enables a potential for massive hydrogen production with low carbon emissions. We studied the possibility to develop this technology at an industrial scale in the French context on a typical industrial example of a Cement Manufacture in the south of France. An integrated process is proposed, which enables the use of the heat released by the CO2 to fuel process to help to capture the CO2 released by the Cement Manufacture. Some technological issues are discussed, and a potential solution is proposed for the catalyst used in the critical step of the Reverse Water Gas-Shift reaction (RWGS) of the process. Copyright (C) 2013, Hydrogen Energy Publications, LLC. Published by Elsevier Ltd. All rights reserved.
Josep Flores - One of the best experts on this subject based on the ideXlab platform.
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the effect of using thermally dried sewage sludge as an alternative fuel on portland Cement clinker production
Journal of Cleaner Production, 2013Co-Authors: Nuria Rodriguez, Shane Donatello, Manel Guillem, Joan Puig, Enric Larrotcha, Sergi Martinezramirez, Maria Teresa Blancovarela, Josep FloresAbstract:This study considers the potential of a sewage sludge previously dried using a novel drying process as an alternative fuel in the Cement industry. A comprehensive characterisation study of the sewage sludge is presented. The calorific value of the sludge was around 8300 J/g, easily meeting Cement industry requirements of 6250 J/g. To account for inorganic ashes that would remain from sewage sludge after burning, it was found that up to 14% of the raw materials used in Cement Manufacture could be replaced with sewage sludge, without changing important raw meal moduli. It was estimated that the sludge raw meal would reduce fossil fuel consumption in a modern Cement kiln by around 70%. Clinkers made from sewage sludge containing raw meal had consistently lower free lime contents. However, a slight increase in belite formation was also noted due to the presence of P from the sewage sludge component.
César Medina - One of the best experts on this subject based on the ideXlab platform.
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Rheological and calorimetric behaviour of Cements blended with containing ceramic sanitary ware and construction/demolition waste
Construction and Building Materials, 2013Co-Authors: César Medina, M.i. Sánchez De Rojas, Phillip Frank Gower Banfill, Moises FriasAbstract:Abstract This research paper analyses the behaviour of new blended Cements containing 10% and 20% ceramic sanitary ware (SW) and construction and demolition waste (C&DW) to determine their suitability as future supplementary Cementitious materials for commercial Cement Manufacture. The effects of these recycled materials on Cement rheology and heat conductivity were studied and an analysis of covariance was run to quantify the impact of each factor and co-variable involved on rheological properties. The addition of ceramic waste reduced shear yield stress and retarded the hydration reactions, whereas construction and demolition waste (C&DW) had the opposite effect, raising yield stress and accelerating hydration kinetics. These behavioural differences between the two types of industrial waste would have a direct effect on the final applications of the resulting blended Cement.
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rheological and calorimetric behaviour of Cements blended with containing ceramic sanitary ware and construction demolition waste
Construction and Building Materials, 2013Co-Authors: César Medina, Phillip Frank Gower Banfill, M Sanchez I De Rojas, Moises FriasAbstract:Abstract This research paper analyses the behaviour of new blended Cements containing 10% and 20% ceramic sanitary ware (SW) and construction and demolition waste (C&DW) to determine their suitability as future supplementary Cementitious materials for commercial Cement Manufacture. The effects of these recycled materials on Cement rheology and heat conductivity were studied and an analysis of covariance was run to quantify the impact of each factor and co-variable involved on rheological properties. The addition of ceramic waste reduced shear yield stress and retarded the hydration reactions, whereas construction and demolition waste (C&DW) had the opposite effect, raising yield stress and accelerating hydration kinetics. These behavioural differences between the two types of industrial waste would have a direct effect on the final applications of the resulting blended Cement.