References of "Léonard, Angélique"
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See detailLife cycle assessment of hemp concret blocks
Groslambert, Sylvie ULg; de Mahieu, Jean-Baptiste; Léonard, Angélique ULg

Poster (2016, May 24)

Buildings notably contribute to global environmental negative impacts due to consumption of both embodied energy and natural resources as well as various emissions during their whole life cycle. It is ... [more ▼]

Buildings notably contribute to global environmental negative impacts due to consumption of both embodied energy and natural resources as well as various emissions during their whole life cycle. It is therefore necessary to develop practices to reduce these impacts, mainly by reducing the part of non-renewable resource in material as well as by ensuring the lowest energy consumption possible during their lifetime. New developments in natural fibres and their use in insulating materials can lead to significant improvement in building environmental impact. For this purpose, assessment of environmental performance is needed to support both the design and the production of (new) fibre based insulation solutions. In this context, the Life Cycle in Practice (LCiP) project helps SMEs to reduce the environmental impacts of their products and services across the entire life cycle. Within the frame of this project, Isohemp (BE) hemp concrete block impact is evaluated in a cradle-to-gate LCA. Functional unit is a pallet of hemp concrete blocks ready for shipping. It represents about 1.3 m³ of blocks. Hemp blocks are made by pressing a mix of hemp shives, hydraulic and hydrated limes, and water. Long term carbon storage due to lime carbonation induces a large benefit in Climate Change (CC) category. The balance of the CC indicator for hemp cultivation is also favorable due to carbon dioxide uptake by the photosynthesis occurring during the plant growth. Life Cycle Assessment of hemp concrete blocks ready to ship has also highlights some improvements that can easily be made at the packaging level in order to lower the global environmental impact and increase the sustainability of this insulation material. Data are processed in SimaPro 8 software, with Ecoinvent 3 and ELCD 3 databases, and analyzed with the CML IA method. This method is compliant with the indicators required by EN15804 standard in order to communicate on the environmental performance of Isohemp blocks. [less ▲]

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See detailLife cycle assessment of hemp concret blocks
Groslambert, Sylvie ULg; de Mahieu, Jean-Baptiste; Léonard, Angélique ULg

Conference (2016, May 24)

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See detailHow to improve the valorisationprocess of End-Of-Life vehicles? LCA as a tool to help decision
Belboom, Sandra ULg; Lewis, Grégory; Bareel, Pierre-François et al

Conference (2016, May 24)

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See detailAccurate measurement of radius evolution as a function of direction in 3D images
Plougonven, Erwan ULg; Hubert, Julien ULg; Collin, Frédéric ULg et al

Poster (2016, May 11)

Very often the reason for using of X-Ray tomography in a research project is to measure the evolution of some geometrical characteristic. The sought characteristic may be explained in simple words like ... [more ▼]

Very often the reason for using of X-Ray tomography in a research project is to measure the evolution of some geometrical characteristic. The sought characteristic may be explained in simple words like size, shape, or distance, but in practice measures based on these notions can have a complex implementation. We present a simple problem, measuring the evolution of radius in a cylindrical sample (a common shape for sample preparation for tomography) and how this value differs according the direction in which we look, when such evolution is known to be anisotropic. The solution is not unique, but we show that a naïve manual approach are not accurate enough, and how even a simple geometric notion such as radius needs a thorough definition in relation to its applicability to 3D image analysis. We extend the argument to how a good understanding of the notions and algorithms used in the quantification of geometrical characteristics can directly affect the pertinence and representativity of the results. [less ▲]

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See detailLife cycle assessment of sound insulation solution made from waste paper
Groslambert, Sylvie ULg; Ernst, Valentin; Léonard, Angélique ULg

Poster (2016, May 09)

Buildings notably contribute to global environmental negative impacts due to con-sumption of both embodied energy and natural resources as well as various emissions during their whole life cycle. It is ... [more ▼]

Buildings notably contribute to global environmental negative impacts due to con-sumption of both embodied energy and natural resources as well as various emissions during their whole life cycle. It is therefore necessary to develop practices to reduce these impacts, mainly by reducing the part of non-renewable resource in material as well as by ensuring the lowest energy consumption possible during their lifetime. For instance, the use of recycled raw materials can lead to significant improvement in building environmental impact. In this context, the Life Cycle in Practice (LCiP) project helps SMEs to reduce the environmental impacts of their products and services across the entire life cycle. Within the frame of this project, Pan-Terre (BE) Acoustix panel impact is evaluated in a cradle-to-gate life cycle assessment (LCA). Evaluation of environmental performance is needed to support both the design and the production of waste based insulation solutions. Manufactured for the last twenty past years, the Acoustix Pan-Terre panel is designed for airborne sound insulation in walls and or floors. This product can only be obtained by mixing in a sensible way two raw materials from cellulose origin, recycled paper and broken shives of flax. Functional unit is 1 m² of panel ready for shipping. Acoustix panels are made by pressing a mix of cellulose from waste paper, flax shives and water. Scraps materials are entirely recycled in the process. Flax cultivation has a favourable impact on the climate change indicator due to carbon dioxide uptake for the photosynthesis occurring during the plant growth. But the drying of the panels is largely contributing to fossil fuel depletion and climate change due to natural gas burners. Life Cycle Assessment of Acoustix sound insulating panels ready to ship highlights some improvements that can be made by optimisation of the drying technology and the (partial) replacement of natural gas burners by alternative fuel burners (such as waste paper and scrap materials). Data are processed in SimaPro 8.1 software, with Ecoinvent 3 and ELCD 3 databases, and analyzed with the CML IA method. This method is compliant with the indicators required by EN15804 standard in order to communicate on the environmental performance of Acoustix panels. [less ▲]

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See detailHow to specify the environmental footprint of electricity? A methodological approach
Belboom, Sandra ULg; Léonard, Angélique ULg

Conference (2016, May 09)

When assessing the environmental footprint of a product or an industrial process, ma-jor impacts in climate change and resources depletion are usually linked to direct or indi-rect energy consumptions ... [more ▼]

When assessing the environmental footprint of a product or an industrial process, ma-jor impacts in climate change and resources depletion are usually linked to direct or indi-rect energy consumptions. Focusing on electricity generation, largely dispersed results can appear for the concerned impact categories depending on the energy mix taken into account. An accurate knowledge of the mix is of major importance for the prediction of the environmental footprint of electricity. As this mix changes from one country to another and through time, regular update is needed to obtain an accurate value of impact for the studied product. Another criteria to also take into account is the specific technology used to generate electricity depending on the primary energy (gas, coal, uranium, sun, wind, etc.). This study aims to generate a simplified tool, containing sufficient data to assess, within a range of 10 % uncertainty, the value of the environmental footprint of electricity, based on a limited amount of accessible parameters. The global life cycle of electricity generation is taken into account, from the resources extraction to the end-of-life. This is essential to be able to compare, on a same basis, the renewable and classical resources for electricity generation. The functional unit of this study for numerical applications is 1 MWhe. To achieve our goal, the following methodological approach has been pursued. First, the energy mix for electricity generation has been collected trough years for different countries. Then a deeper study of specific technologies relative to each kind of primary energy consumption has been performed. Meta-analyses relative to LCA results have been studied to highlight the main important criteria of these technologies. Then, the amount of needed data for the environmental assessment of these technologies has been reduced to the main important ones. The step further is about the use of these data to obtain an available tool to predict the environmental footprint of electricity depending mainly on the energy mix and used technologies. The environmental impact of 1 MWhe can then be easily calculated using this tool in several categories as climate change, acidification, ozone layer depletion, etc. using the ILCD method. Concerning the resources depletion assessment, all available methodolo-gies have been studied with a specific focus on the CEENE method using an exergetic assessment of resources. This method allows the highlighting of the use of energy and all types of resources (fossil, renewable like wind, sun or land). This perspective can also be used to discriminate several resources for the electricity production. A comparison of the results obtained using resources impact methods has then been performed and some challenges concerning the use of existing impact pathways have been highlighted as well as some perspectives to tackle them. This research has been supported by the Public Service of Wallonia – Department of Energy and Sustainable Building within the framework of the ECEB project [less ▲]

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See detailEnvironmental Impact Assessment of Rail Freight Intermodality
Merchan Arribas, Angel ULg; Belboom, Sandra ULg; Léonard, Angélique ULg

in Pombo, Joao (Ed.) The Third International Conference on Railway Technology: Research, Development and Maintenance (2016, April)

The European Commission’s White Paper on transport seeks to achieve an efficient and sustainable balance between the various transport modes. In this context, BRAIN-TRAINS is a project supported by ... [more ▼]

The European Commission’s White Paper on transport seeks to achieve an efficient and sustainable balance between the various transport modes. In this context, BRAIN-TRAINS is a project supported by Belgian Federal Government that deals with rail freight intermodality, approaching the problem from an interdisciplinary perspective. BRAIN-TRAINS will be able to answer the transition involved in transportation in Belgium. To analyse the sustainability impact of rail freight intermodality in Belgium, the life cycle assessment methodology will be used. The rail freight system is divided in this paper into rail operation, rail equipment and rail infrastructure. This paper shows the methodology to calculate the transport emissions related with the energy consumption during the rail operation. [less ▲]

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See detailDrying induced shrinkage of Boom Clay: an experimental investigation
Prime, Noémie; Levasseur, Séverine; Miny, Laurent et al

in Canadian Geotechnical Journal (2016), 53(3), 396-409

Drying induced shrinkage of geomaterials may have a strong effect on geostructure stability and deformation. Settlement of foundations, fracture opening on slopes, roads, tunnel walls may be due to drying ... [more ▼]

Drying induced shrinkage of geomaterials may have a strong effect on geostructure stability and deformation. Settlement of foundations, fracture opening on slopes, roads, tunnel walls may be due to drying shrinkage. However, there is still a lack of knowledge concerning shrinkage evolution in time and shrinkage propagation within the material. In this study, the shrinkage of a specific clayey rock, Boom Clay, under drying conditions is experimentally investigated. This rock is a deep geological formation which is under study for high-level and long-life radioactive waste storage in Belgium. Two experimental campaigns are here presented. The first one, based on vapour equilibrium drying technique and completed by sample size manual measurement, aims to characterize the material shrinkage in balanced states. The second one, based on convective drying technique completed by shape monitoring using X-ray tomography, aims to analyse how shrinkage develops before reaching a steady state. Both approaches put in evidence the shrinkage anisotropy of this structurally bedded rock, with a ratio around 2 between the direction of maximum strains and the direction of minimum strains. However, the two drying techniques also provide complementary results, as the relation between the amount of shrinkage and the retention curve (for the uniform drying imposed with saline solutions) and the kinetics of shrinkage propagation inside the material (for the non-uniform drying imposed with air convection). [less ▲]

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See detailDesiccation cracks formation in clay-barrier for nuclear waste disposal
Hubert, Julien ULg; Prime, Noémie; Plougonven, Erwan ULg et al

Conference (2016, February 16)

In geotechnical engineering, the desiccation cracking of soil is commonly observed. This phenomenon is detrimental to the behavior of earth material and earth structure. Desiccation cracks can lead to the ... [more ▼]

In geotechnical engineering, the desiccation cracking of soil is commonly observed. This phenomenon is detrimental to the behavior of earth material and earth structure. Desiccation cracks can lead to the overall failure of many geotechnical structures: • They can affect the slope stability of earth dams or embankments; • They can initiate internal erosion of embankments due to water flow through the cracks; • They can compromise the efficiency of soil barriers such as landfill liners and top covers. Nowadays, the storage of nuclear waste in deep impermeable geological layers is considered. These storages are based on the multi-barrier principle, the last of which being the host rock, typically a clayey material. In this context, maintaining the very low hydraulic conductivity of the host rock is crucial. Unfortunately, the ventilation of excavated galleries causes convective drying of the host material and can lead to crack formation. This work aims to understand in which conditions exactly, during convective drying, does cracking occur in clayey materials. An experimental campaign has been carried out to characterize the drying behavior of Boom clay which is the host rock at the underground research facility in Mol (Belgium). X-Ray micro-tomography has been used to analyze crack development as well as shrinkage. The experiments are used to calibrate the transfer parameters of a convective drying law based on the limit layer model. This calibration is based on agreement of the drying kinetics. A numerical study is then performed and aims at reproducing the behavior observed during the experiments. A thermo-hydro-mechanical coupled model is used to determine the stress distribution during the drying and a tensile failure criterion is suggested to predict crack genesis. Simulations are performed using the in-house built FEM code LAGAMINE. [less ▲]

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See detailDoes biobased polymer achieve better environmental impacts than fossil polymer? Comparison of fossil HDPE and biobased HDPE produced from sugar beet and wheat
Belboom, Sandra ULg; Léonard, Angélique ULg

in Biomass & Bioenergy (2016), 85

Polymers are one of the most used materials and the majority of their production is based on fossil fuels. Due to the decrease of oil resources and concerns about climate change, alternatives are needed ... [more ▼]

Polymers are one of the most used materials and the majority of their production is based on fossil fuels. Due to the decrease of oil resources and concerns about climate change, alternatives are needed, the transformation of biobased ethanol into biobased polymer being one of them. This paper undertakes an environmental evaluation of the production of biobased polymer produced from two different feedstock cultivated in Belgium: sugar beet and wheat. Both crops cultivation are studied as well as their transformation into biobased ethanol, first, and then to biobased ethylene, focusing on high-density polyethylene (HDPE) as final product. These scenarios are analyzed and compared with the production of conventional polymer using the life-cycle assessment (LCA) methodology with reference to relevant environmental impact categories. This study shows a reduction of impact of around 60% for both climate change and fossil fuel depletion categories when using biobased HDPE instead of its fossil counterpart. For all other impact categories, fossil HDPE achieves better results than the biobased product. [less ▲]

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See detailPhotocatalytic decolorization of Gentian Violet with Na-doped (SnO2 and ZnO)
Benhebal, Hadj; Chaib, Messaoud; Crine, Michel ULg et al

in Chiang Mai Journal of Sciences (2016), 42

Photocatalysis is a technique used for the purification and decolorization of water. In this work, the photocatalytic decolorization of aqueous solutions of Gentian Violet has been investigated. The ... [more ▼]

Photocatalysis is a technique used for the purification and decolorization of water. In this work, the photocatalytic decolorization of aqueous solutions of Gentian Violet has been investigated. The photocatalysts used for the study are tin dioxide (SnO2) and zinc oxide (ZnO) doped with sodium and prepared by sol-gel process. Photocatalysts were synthesised by sol-gel process and characterized by several techniques such as X-ray Diffraction (XRD), Scanning Electron Microscopy (SEM), Brunauer, Emmett and Teller (BET) method and UV-vis Spectroscopy. The results of photocatalytic activity of gentian violet degradation under ultraviolet irradiation, indicated that the synthesised photocatalyst exhibit good photocatalytic performance. [less ▲]

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See detailConvective drying of cherry tomato: Study of skin effect
Khama, Reda; Aissani, F.; Alkama, R. et al

in Journal of Engineering Science and Technology (2016), 11(3), 443-457

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See detailExperimental Comparative Study on Lithium Chloride and Calcium Chloride Desiccants
Bouzenada, Saliha ULg; Kaabi, A. N.; Fraikin, Laurent ULg et al

in Procedia Computer Science (2016), 83(718-725),

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See detailPositive Operations on Wastewater Sludge Drying: Comparison of Back-Mixing and Sawdust Addition
Li, Jie; Plougonven, Erwan ULg; Fraikin, Laurent ULg et al

in Energy & Fuels (2016), 30(4), 3014-3019

Detailed reference viewed: 20 (3 ULg)