648 Works

Vers l’optimisation des méthodes de moussage pour la production de mousses minérales

Annabelle Phelipot-Mardelé & Christophe Lanos
Une matrice minérale présentant une micro-structure très poreuse peut être obtenue en faisant mousser à l’état frais une suspension minérale. L’étude réalisée permet de montrer que, selon la nature du liant minéral, la méthode de moussage doit être adaptée. Deux liants hydrauliques sont étudiés : un ciment Portland et un liant gypseux. La suspension minérale est obtenue en mélangeant le liant et de l’eau en présence d’un tensio-actif et d’un fluidifiant. Le malaxeur utilisé correspond...

Évaluation des impacts économiques indirects selon un scénario de risque d’inondation

Ismaïl Saadi, Ahmed Mustafa, Jacques Teller & Mario Cools
Dans ce papier, nous proposons un modèle intégré permettant d’évaluer les impacts économiques indirects causés par les risques d’inondation en Belgique. En tenant compte des risques d’inondation induits par l’accroissement de l’occupation du sol selon différents scénarios climatiques, les impacts économiques indirects peuvent être estimés à l’échelle microscopique en utilisant un modèle Input-Output (IO). IO est un modèle économétrique qui représente, sous forme d’une matrice Production-Consommation (P-C), les flux de marchandises et de matières premières...

Vers un Quartier Zéro Energie (QZE) : une approche méthodologique

Sesil Koutra, Vincent Becue, Mohammed-Anis Gallas & Christos S. Ioakimidis
La stratégie ‘Energie 2020’ affirme que le futur de l’industrie, l’économie et la population dépendent de l’énergie durable et abordable et confirme les objectifs ’20-20-20’ à réduire l’effet de serre de 20%, l’augmentation de l’énergie renouvelable à 20% et une amélioration de 20% de l’efficacité énergétique. Le défi majeur, aujourd’hui, est l’adaptation et la modernisation des bâtiments existants afin d’atteindre un équilibre annuel de zéro énergie à l’échelle d’un quartier dans le but d’atteindre le...

Localiser la population urbaine pour optimiser la gestion du territoire

Eric Hallot, Lien Poelmans, Inge Uljee, Benjamin Beaumont & Nathalie Stephenne
Construire les « Smart Cities » de demain est un enjeu de développement durable tant pour les pouvoirs publics régionaux que locaux. Pouvoir quantifier et localiser précisément la population est important pour la gestion des villes et l’analyse des risques (pollution, inondations, déchets…). Le projet SmartPop propose de désagréger les statistiques démographiques sur base de la carte d’occupation du sol wallonne (COSW). L’adaptation et la comparaison d’algorithmes de cartographie dassymétrique en Wallonie et en particulier...

Contribution à la Modélisation du GSOM Lagrangien

Asma Khelifi, Habib Haj-Salem, Jean-Patrick Lebacque, Jennie Lioris, Guillaume Costeseque & Lotfi Nabli
Dans nos travaux, nous sommes motivés par la modélisation du réseau routier grâce aux modèles macroscopiques de flux de trafic d’ordre supérieur. Plus précisément, la famille générique des modèles GSOM. Nous étudions alors le modèle d’intersection basé sur la discrétisation lagrangienne du modèle GSOM. En effet, les modèles macroscopiques d’ordre supérieur ont été étudié sur une section homogène, mais ils attirent encore peu d’attention pour leur mise en oeuvre sur des jonctions parce qu’elles sont...

Multicriteria analysis of hemp particles’ impact on physical and thermo-mechanical performances of hemp concrete

C. Niyigena, S. Amziane & A. Chateauneuf
The hemp concrete is considered as an eco-material due to its environmental assets. Its constituents are mainly the hemp particles, binder and water to which admixtures are added eventually. The quality of hemp particles is very sensitive to the nature of soil where it is produced and also to its transformation process, which results in properties variability of hemp particles. And this may be a barrier to development of hemp concrete industry. The herein study...

Innovative uses of biochar as carbon sequestering building materials in wall plaster and pellets

H. W. Kua, M. S. Ng & K. Ong
Biochar has recently been explored as an alternate construction material. While it has been deployed as road construction, there is an emerging trend of using biochar as concrete admixture and other non-structural building elements. This study explores the use of biochar as a component in wall plaster and pellets that are used to fill cavities for interior non-structural wall panels. Biochar was incorporated in plastering material and the carbon dioxide adsorption capability of this material...

The compatibility between wool fibers and cementitious mortars

A. P. Fantilli, D. Jóźwiak-Niedźwiedzka, K. Gibas & J. Dulnik
The addition of natural fibers residue in cement based materials can be a sustainable technological alternative for traditional dispersed reinforcement, and can improve the performance of brittle matrix materials. The presence of a wool reinforcement can increase the fracture toughness and, at the same time, can reduce the environmental impact of cementitious mortars. The beneficial effects are similarly to those observed in presence of vegetal fibers (e.g.,hemp), which have been largely investigated in the literature....

Use of natural fibres to enhance tensile strength of concrete

R. A. C. J. Seneviratne, G. Tharmarajah & P. Archbold
This paper discusses the influence of natural fibres on density, compressive strength and flexural strength of fibre reinforced concrete specimens. Coir fibre extracted from coconut husk was added to high strength concrete to produced 36 test cubes and 36 beam samples. Tests carried out on cube and beam samples show that compressive strength of high strength concrete reduces with addition of coir fibres. The reduction is noticed varying with the change of fibre content and...

Effect of viscosity modifying agent on the mechanical and transport properties of hemp and rapeseed straw concrete

J. Sheridan, M. Sonebi, S. Taylor & S. Amziane
In recent decades sustainability, carbon footprint and pollution have become significant issues on a global scale. It is widely recognised that the carbon footprint of the construction industry is something that can be reduced and this has led to sustainable materials being used more and more widely to meet emissions targets. Two of these materials are hemp concrete and rapeseed-straw concrete which are bio-composites made of the bio-aggregate, water and a lime binder; in this...

Effectiveness of starch ethers as rheology modifying admixture for cement based systems

E. Vasiliou, W. Schmidt, M. Stefanidou, H. C. Kühne & A. Rogge
Polysaccharides are important rheology modifying admixtures in the building material sector. The use of starch is becoming increasingly important, due to many ecological and economic advantages. In the construction sector, starch ethers are being used as thickeners and as means to increase the yield stress. The starch ethers that are available on the market differ in their behaviour, which can vary greatly depending upon the binder system and mortar composition, e.g. solid volume content, binder...

Properties of modified phosphogypsum binder

L. Dvorkin, N. Lushnikova, M. Sonebi & J. Khatib
Phosphogypsum (PG) is common by-product of chemical fertilizers plants. However, it has limited use in local construction industry. At the same time the deposits of natural gypsum will depleted in several decades and alternative waste by-product gypsum will be required. The main disadvantage of phosphogypsum binder is the need in neutralization of harmful admixtures, aggregation of PG particles during grinding and high water demand. Therefore, there is need in modifying admixtures to facilitate the manufacturing...

Conventional and microwave-assisted thermal treatment of dendrocalamus asper bamboo

T. Magalhães, V. Dos Santos, C. Gauss & H. Savastano Junior
The thermal treatment process of bamboo or wood can be used to improve the mechanical properties and enhance the dimensional stability. The aim of this work was to investigate the mechanical properties of the bamboo Dendrocalamus asper after thermal treatment using a microwave-assisted oven (MO) and a conventional furnace (CF), normally used for this purpose. In the present study, prismatic samples of bamboo were heat treated in the presence of air at the temperatures of...

Effect of linseed oil and metakaolin on the mechanical, thermal and transport properties of hemp-lime concrete

J. Sheridan, M. Sonebi, S. Taylor & S. Amziane
With the increasing concern given to pollution and climate change bio-based building materials have been pushed to the forefront of research in an effort to reduce the large carbon footprint of the construction industry in order to meet emission targets One of these materials is hemp concrete which is a bio-composite made up of the non-fibrous part of hemp called shiv, water and a lime binder. This study investigated two different binders; hydrated lime as...

Effect of the use of autoclave on bio-construction materials

H. Elaqra & L. Arnaud
The paper discusses the use of autoclave as acceleration method for increasing the strength of bioconstruction materials. Three mixes where studied, they were prepared in order to have a CaO/SiO2 around 1. Hemp fibers were mixed with three different binder, Lime and silica fume mix (CaO/SiO2 = 1), cement and silica fume mix (CaO/SiO2 = 0,96) and cement, silica fume and lime mix (CaO/SiO2 = 0,95). Two curing temperature (110°C, 130°C and 180°C) used. The...

An exploratory study on earthen materials stabilized by alkaline activator

Q. B. Bui, E. Prudhomme, A. C. Grillet & N. Prime
Earth is an ancient building material which has been recently the focus of scientific research because of the significant heritage of earthen buildings throughout the world. Moreover, a renaissance of earth constructions has been observed due to sustainable properties of this material. However, the disadvantage of earthen material is its low strength and its sensibility to the water content. To enhance the durability and the mechanical characteristics of earthen material, hydraulic binders are currently added...

Mechanics of straw bales for building applications

T. Lecompte & A. Le Duigou
During the last decades, straw bales have seen an increasing interest for building insulation and even for the construction of small load-bearing straw houses, especially in view of the need to seek low environmental footprints. Up to present, very few studies are available concerning the mechanical behaviour of straw bales in buildings. Nowadays hybrid timber and straw methods are taking over from simple load bearing structures. There is a lack of knowledge about the mechanical...

Development of a laboratory test method to assess the resistance of bio-based insulation materials against moulds

I. Le Bayon, M. Draghi, M. Gabille, M. Prégnac, J. Lamoulie, M. Jequel, M. Roger & M. Kutnik
Bio-based insulation materials have been increasing in the construction market in Europe. However, there is a lack of reliable standardised test method to determine their resistance against moulds. Moreover, existing test methods do not take into account real hygrothermal conditions in use. This research project aimed to develop a laboratory test method to assess the resistance of bio-based insulation materials against moulds. The test method was applied to different bio-based insulation materials: wood fibre, loose...

The “NatuRALiMe ” project: new insights into the study of hempbased mortars for new construction and heritage conservation

A. Arizzi & H. Viles
NatuRALiMe (acronym standing for: “Naturally durable: Developing and testing the Resilience of innovative natural Additives for Lime-based conservation Mortars”) is a two-year project (2013- 2015) funded by the European Union's Seventh Framework Programme (FP7/2007-2013) and being developed at the University of Oxford (UK). The overall aim of this research project is to design suitable and durable mortars made with lime and natural additives (i.e. derivatives of the vegetable and animal world). Interest in studying and...

Effect of testing variables on the hydration and compressive strength of lime hemp concrete

S. Pavia, R. Walker & J. McGinn
This paper investigates the effect of testing variables including curing conditions (65% vs>95% RH), time of demoulding and specimen geometry (cylinder vs cube) on the compressive strength of hemp concrete. It studies hydration in the concrete’s microstructure and measures compressive strength development at intervals between 1 day and 1 month. Moulding time and curing conditions influence drying and therefore may impact binder hydration and consequently strength evolution. Specimen geometry may affect drying and can also...

Modélisation de rupture en béton par éléments discrets

Zhu Ran, Syed Yasir Alam & Ahmed Loukili
L’effet d’échelle est un problème majeur dans la conception des structures. Ce problème devient de plus en plus complexe et prononcé dans le béton car ces matériaux ne possèdent pas d’adoucissement plastique, et leur rupture est due à la fissuration caractérisée par une grande zone de microfissuration (fracture process zone). Cette fissuration passe par un adoucissement sous la forme de microfissures et de glissement interparticules. Cette étude utilise la méthode des éléments discrets (MED). Le...

Environmentally friendly vege-roofing tile: an investigation study

N. Z. Habib, S. E. Zoorob, C. A. Ng, M. Zahiraniza, I. Kamaruddin, Y. A. Syafiq, S. Sumathi, N. Humayun & M. M. Sohaib
This paper presents a research study conducted on the usage of vegetable oil as a binder for roofing tile. Conventionally the roofing tiles used by construction industry are either concrete or clay roofing tiles in which cement and heat curing is used as a binder. Both of these material types utilize a large amount of energy for their manufacture, making it environmentally unfriendly because of high content of CO2 emission during its production. To cater...

Is hemp lime concrete a mix of hemp and lime?

B. Mazhoud, M. Viel, F. Collet, A. Phelipot-Mardelé, C. Lanos & S. Prétot
Hemp lime concrete is a mix of hemp shiv glued in a mineral binder. Such concrete is characterized by low thermal conductivity and interesting hygric properties. The aims of this study realized in the frame of ISOBIO Project is to understand which is the contribution of each component of the hemp lime concrete to the thermo-hygric properties of the mix. The study focuses on the case of a commercial hemp shiv (Biofibat®, CAVAC France) and...

Hydrophobation of natural fibres for application in WPC materials

A. Barrio, A. Salvador, J. Hidalgo & I. Svensson
The objective of the present study was to improve the method of hydrophobation of natural fibers for its application in WPC. For outdoor applications such as in decking’s and ventilated facades improved durability against weathering is desired. This problem is associated with the water adsorption of the natural cellulosic fibres. Commercial paper sizing agents AKD was used for the optimization of surface hydrophobation of natural fibres (wood flour; Rettenmaier BK 40/90). Parameters studied included: Application...

Development of a thermocompression manufacturing process adapted to flax-epoxy laminated composites

T. Cadu, L. Van Schoors, O. Sicot, S. Moscardelli, L. Divet, E. Keita & S. Fontaine
This study focuses on the optimization of a manufacturing process adapted to flax fibers based composites in which the components are controlled. Twelve plies unidirectional composites samples were prepared by thermocompression using unidirectional flax fibers and fluid epoxyamine resin. Temperature cycle was chosen to limit fibers degradation during fabrication. Different parameters have been studied to evaluate their influence on the mechanical properties of composites. 0° tensile specimens were tested at a 1mm/min crosshead speed. Measures...

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  • 2020
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