789 Works

Properties of concrete made of fine aggregates partially replaced by incinerated municipal solid waste bottom ash

O. Baalbaki, A. Elkordi, H. Ghanem, M. Machaka & J. M. Khatib
The objectives of this research is to investigate the influence of Municipal Solid Waste Incinerated Bottom Ashes (MSWI-BA) on engineering properties of specimens when part of fine aggregate is replaced with it. Disposal of municipal wastes is a major key issue which causes a problematic challenge in Lebanon as landfill space for the disposal of ash from Municipal Solid Waste Incineration (MSWI) becomes rare. It becomes smarter to reduce the volume of materials being disposed....

Experimental investigation on the use of alpha fibres as reinforcement of cementitious materials

S. Ajouguim, C. Djelal, J. Page, M. Waqif, K. Abdelouahdi & L. Saâdi
Fibers commonly used in cementitious composites have been derived from non-renewable resources. Economic issues related to the rising costs of fossil resources, their increasing scarcity, and environmental impacts inherent to their production therefore lead to explore other material resources. In this regard, plant fibers could be used instead of non-renewable fibers which can present an important pathway in the future of the construction industry. In North Africa, Alfa is a widespread plant in the dry...

Comparison of crimson fountaingrass and diss fibers as aggregates for cement mortars

A. Valenza, D. Badagliacco, T. La Mantia, L. Ercoli & B. Megna
The use of natural fibres in cement composites is an expanding research field as their use can improve the mechanical and thermal behavior of cement mortars and reduce their carbon footprint. In this paper two different wild grasses, i.e. Pennisetum Setaceum, also known as crimson fountaingrass, and Ampelodesmos Mauritanicus, also called diss, are used as source of natural fibres for cement mortars. The principal aim is to evaluate the possibility of using the more invasive...

Dynamic life cyle carbon assessment of three bamboo bio-concretes in Brazil

L. Caldas, F. Pittau, V. Andreola, G. Habert, A. Saraiva & R. Toledo Filho
Brazil has a vast use of concrete in the construction sector. Having the ability to store carbon for long periods, the development of concretes mixed with bio-based materials can be a promising alternative to ordinary concrete products in the Brazilian building sector, as a measure to reduce the GHG emissions. A bio-concrete with bamboo waste (BB) as main material, mixed with ordinary Portland cement (OPC) and supplementary cementitious materials (SCM), metakaolin (MK) and fly ash...

Life cycle sustainability assessment of enzyme-induced carbonate precipitation (EICP) for fugitive dust control

A. J. Raymond, C. Purdy, T. Fox, A. Kendall, J. T. DeJong, , M. Woolley & K. Martin
Fugitive dust caused by infrastructure construction reduces air quality and may cause serious respiratory problems. Earthwork contractors apply dust control strategies to meet environmental regulations for dust mitigation. A life cycle sustainability assessment (LCSA) was performed to compare the impacts of two dust control methods: water application—currently considered the best available technology by industry—and enzyme-induced carbonate precipitation (EICP), a new bio-mediated technology being developed at Arizona State University. For each dust control method, indicators of...

The effect of long term weathering on 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. The most widely researched bio-aggregate to date is hemp shiv; which is used in this study as well as chopped rapeseed straw which is...

Natural fiber-reinforced plastics composites: long-term physico-structural performance in façades

D. Friedrich
Mixing fossil-based plastics with wood fibers is an effective measurement for a more responsible use of scarce crude oil resources. However, products made from such wood-polymer composites (WPC) not necessarily show similar properties as if made from neat plastics specifically if intended for structural outdoor use such as façades. This papers reports from a multi sampling of three WPC compounds showing different surface finishings. After one year natural weathering in Central Europe, physico-mechanical properties were...

Durability of flax/bio-epoxy composites intended for strengthening applications in construction

K. Benzarti, R. Chlela, M. Quiertant, S. Zombre, L. Curtil & M. Michel
Environmentally friendly FRP composites, made of natural fibers and bio-based polymer matrices, may be used as externally bonded reinforcement for civil structures or buildings subjected to moderate outdoor conditions, in replacement of traditional carbon/epoxy systems. However, a major drawback of natural fibers is their sensitivity to moisture which can affect both the mechanical properties of FRP composites and their adhesive bond with concrete. This research aims at studying the influence of hygrothermal ageing on the...

Assessment of straw degradation inside straw bale walls in severe cold region of China

X. Yin, M. Lawrence, D. Maskell & C. Sun
With the increasing concerns of low carbon development of building industry, the feasibility of using straw bale buildings has been widely discussed for the last decade in China. However, there are few studies focus on assessment of durability of this building type regarding the climatic features in China. This paper analyzes the features of straw degradation inside straw bale walls in the severe cold region in China. The analysis involves two parts of researches: The...

Thermo-structural behavior of soft wood under high X-ray tomography resolution

K. Abahri, D. Kosiachevskyi, A. Rima, C. El Hachem & M. Chaouche
This study consists in better understanding of the influence of the temperature variations on softwood morphological and structural properties. In this context, the X-ray tomography protocol has been used to follow the property variations, a specific tomographic platinum was used to generate thermal flows and to solicit the sample during scans. The study was carried out for temperatures between -5°C and 40°C. The numerical treatments allowed us to investigate the evolution of three microstructural properties...

Water transport properties of cement mortars with mussel shell aggregate

C. Martínez-García, B. González-Fonteboa, D. Carro-López & F. Martínez-Abella
Aquaculture and cannery industry are important economic sectors in different countries. It generates big profits and create thousands of employment. However, it also produces lots of waste, being bivalve shells remarkable because of their volume. Shell residue usually is disposed in dump sites producing a great environmental impact. Nevertheless, some research works have proved that it is possible to reuse shells in several industrial activities, including construction. In general, cementitious pastes are commonly used in...

Preliminary studies of hemp and recycled aggregate concrete

S. Ghosn, N. Cherkawi & B. Hamad
This paper reports on preliminary tests conducted on Hemp and Recycled Aggregate Concrete (HRAC), a sustainable concrete material prepared by partial replacement of natural coarse aggregates (NA) with recycled concrete aggregates (RCA) and incorporating hemp fibers in the concrete mix. The aim of this study was to evaluate the effect of such replacement on the hardened mechanical properties of concrete. For this purpose, six concrete mixes were prepared, where natural coarse aggregates were partially replaced...

Towards a better understanding and knowledge of biobased materials through a new acoustic database

P. Glé, T. Blinet, C. Guigou-Carter, T. Falwisanner, E. Kadri & F. Bou-Cherifi
In this work, the acoustical performances of building elements including natural sustainable fibrous and granular materials have been evaluated to create a new database. These characterisations have been carried out at two scales. On the one hand, the physical parameters of the considered biobased materials have been characterised in Cerema laboratory at the material scale; the sound absorption and transmission loss were mainly obtained in normal incidence from Kundt tube measurements, following the three microphones...

Influence of cork powder grainsize in thermal and mechanical properties of cork-NHL mortars

B. Megna, D. Badagliacco, C. Sanfilippo & A. Valenza
Cork is a unique material, characterized by small closed cell structures, high insulating properties, very low density, high fire resistance and a very good durability after simple thermal treatment. The main use of cork in the production of stopper and insulating panels obtained with cork grains and a polymeric resin. Usually cork grains used in panel production have a grainsize around 1-2 mm. In this work cork grains have been used as aggregates for natural...

A local kinetics of sorption model: theoretical background and application to the simulation of an ISOBIO demonstrator

N. Reuge, F. Collet, S. Moissette, M. Bart, S. Pretot & C. Lanos
The classic models describing the hygric mass transfers inside building materials seem unsuitable in the case of bio-based materials. They are based on the assumption of an instantaneous local equilibrium between relative humidity and water content evolving according to the diffusive fluxes and the sorption isotherms and predict much shorter times of stabilization than those obtained experimentally. A new approach is presented here, it frees from the local instantaneous equilibrium introducing a local kinetics to...

Contribution à la modélisation dynamique de la maçonnerie chainée

Choayb Belghiat, Jean-Patrick Plassiard, Pascal Perrotin, Olivier Plé, Mohamed Guenfoud & Ali Messabhia
Le présent article vise l’étude du comportement de la maçonnerie chainée dans le contexte d'une structure en béton armé soumise à la combinaison de charges latérale et verticale. Ce travail consiste dans un premier temps à collecter les différents modèles fournis dans la littérature et à ne retenir que ceux qui sont appropriée à notre cas d’étude. La modélisation retenue a pour objectif d’obtenir un compromis optimal entre précision et simplicité. En ce sens, la...

Effet du traitement sur les propriétés thermomécaniques et hydriques de la paille céréalière utilisée pour un matériau d’isolation thermique

Naima Belayachi, Dashnor Hoxha & Brahim Ismail
L’objectif de ce travail est d’étudier l’influence de deux traitements sur le comportement de la paille céréalière en vue de son utilisation dans l’élaboration d’un bio-composite destiné à l’isolation thermique des bâtiments. Le papier présente les essais réalisés sur deux variétés de paille blé et orge, comprenant les essais d’absorption d’eau après différents temps d’immersion, les essais thermomécaniques, et les analyses ATG-DSC pour l’étude de la dégradation ou décomposition thermique. L’exploitation des résultats de dilatation...

Elaboration et caractérisation thermique et hygrique de composite bio-sourcé à base d’argile

Brahim Mazhoud, Florence Collet, Sylvie Prétot & Christophe Lanos
Cette étude s’intéresse à l'utilisation d'argile comme liant pour élaborer des composites chanvre-argile. L'argile est issue de boues de lavage d’un site de production de graviers. Deux températures de séchage des boues sont considérées. Les performances thermiques et hygriques des argiles et des composites chanvre-argile sont mesurées et comparées à celles de bétons de chanvre. La caractérisation thermique est basée sur la mesure de conductivité thermique à 23°C-50%HR. La caractérisation hygrique est basée sur la...

A picture on bio-based building materials as thermal insulation for sustainable buildings

Z. F. El Faridy, A. Trabelsi & F. Kuznik
The movement of heat, air, and moisture through the buildings are related to the energy consumption for heating and cooling in order to achieve the satisfaction of the building occupants. The differences in temperature and relative humidity between the inside and the outside of a building induce transfers of heat and moisture through the envelope which exhibit different behaviors according to materials composing it. A wise choice of wall component allows a better energy and...

DenCity: Zero Energy Light Weight Construction Households for Urban Densification

Mohamed Amer & Shady Attia
Accommodating more populations in the cities is becoming an increasingly complex task, especially with the mounting local and global migration and the raising demand on housing. Thus, the application of urban densification has recently been put forward as a promising alternative to urban sprawling. By increasing the density in the cities, it offers potential opportunities for reducing carbon emissions, erosion of green fields and enormous investments to establish new infrastructures. Yet, there are many constrains...

Caractérisation des adhésifs et des performances de goujons-collés sous chargement thermique

Mathieu Verdet, Alain Cointe, Jean-Luc Coureau, Philippe Galimard, Christine Delisée & Alexander Salenikovich
Mis en oeuvre en rénovation comme en construction neuve, les goujons-collés sont utilisés dans les structures bois pour leur capacité à réaliser des assemblages résistants et rigides. Néanmoins, leurs performances sont sensibles à la chaleur. La caractérisation d’une résine époxy (EPX) et d’une colle polyuréthane (PUR) a été réalisée à l’aide d’essais mécaniques dynamiques (AMD) afin d’évaluer l’évolution du comportement élastique et mesurer la température de transition vitreuse Tg sur la plage [30°C ; 120°C]....

Development of methods to take account of structural imperfection in the critical analysis of light metallic structures

G.G. Chewe Ngapeya, A. Khelil & A. Pamies
When calculating a structure, the stresses can be determined by analyzing the first or second order; the choice of method is guided by the potential influence of the deformation of the structure. In general, we can see that the scaffolding and shoring structures, due to their low rigidity (stiffness compared to buildings), come in loads of critical coefficients lower than 3. Their structural defects (imperfections) generate significant second order effects and must be taken into...

Un Building Information Modeler comme support d'un bâtiment modulaire

Anabelle Rahhal, Vincent Delfosse, Christelle Boulanger, Cyril Lorquet & Pierre Leclercq
Dans cet article, nous présentons un Building Information Modeler mis en œuvre pour la création, la visualisation et l’évaluation des performances d’un projet de bâtiment modulaire, s'appuyant sur une maquette numérique. Nous exposons, dans un premier temps, le contexte et la mise en place de l’approche choisie, dite « par composants » et de sa notion centrale de «catalogue», capable de supporter la virtualisation du système constructif dans le modeler. Dans un second temps, nous...

Modélisation de l’éclairage naturel dans les premières étapes d’un projet d’aménagement

R. Nahon, B. Beckers & O. Blanpain
Les principaux volumes, la morphologie d’un projet d’aménagement urbain sont définis dans le plan masse. La connaissance du projet y est encore faible : le positionnement et la forme des fenêtres, le cloisonnement intérieur notamment restent à définir. [NAH 2015] montrent l’impact de ces paramètres sur l’éclairage naturel à l’intérieur des bâtiments ; comment donc l’étudier quand la réflexion se porte sur la géométrie extérieure du projet ? L’objectif de cet article est d’établir un...

Rheological and mechanical behavior of earth materials / starch mixes

G. Alhaik, M. Ferreira, V. Dubois, E. Wirquin, S. Tilloy, E. Monflier & G. Aouad
This research work highlights a new approach in the sector of building materials based on bio resources. An experimental investigation was conducted in order to study the rheological and mechanical behavior of earth/starch mixes. In this study, two types of earth materials have been studied: quarry fines and a model material which was kaolinite. For starches, two categories have been used: native and derivative. Starch with a chemical modification has also been studied. The earth/starch...

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