1,015 Works

Effect of sheep wool fibres on thermal-insulation and mechanical properties of cement matrix

A. Valenza, V. Fiore, A. Nicolosi, G. Rizzo, G. Scaccianoce & G. Di Bella
The use of sheep wool as reinforcement of cement in order to produce mortar or plaster involves several advantages for environment and energy. Moreover, in several regions it is treated as a waste and, consequently, its employ is characterized by low cost. Aim of this paper is to evaluate the influence of wool fibres on thermal conductivity and mechanical properties of cement. The samples were prepared using wool fibres, obtained from a breed of Sicilian...

La porosité au service du confort intérieur

A. Phelipot-Mardelé & C. Lanos
Le béton de chanvre est composé de liant minéral et de fibres de chanvre. Les caractéristiques principales de tels bétons sont leurs propriétés hydrique et isolante très intéressantes. Cette étude entre dans le cadre du projet européen ISOBIO. L’un des enjeux est la contribution de la chaux dans les propriétés thermo-hydriques du béton de chanvre. Le présent article s’intéresse en particulier à la chaux commerciale Thermo®, BCB. Des mousses minérales ont été fabriquées à partir...

Phénomènes réversibles lors de chargement cyclique des liants bitumineux

Ebrahim RIAHI, Fatima ALLOU, Ramon BOTELLA, Joseph ABSI, Frédéric DUBOIS & Christophe PETIT
Ce travail a pour objectif d'évaluer et quantifier les phénomènes réversibles qui se produisent lors de chargement cyclique uni-axial en traction-compression sur des matériaux bitumineux. La littérature indique que les variations réversibles du module complexe sous le chargement cyclique, sont liées à l’auto-échauffants du matériau viscoélastique provenant de sa dissipation énergétique, ainsi que son comportement thixotrope. Un essai cyclique en traction-compression avec balayage en déformation a été employé pour capturer la variation de rigidité des...

Light-weight claydite and sawdust concrete based on supersulphated cement

L. Dvorkin, N. Lushnikova, M. Sonebi & J. M. Khatib
The paper gives coverage on the peculiarities of the properties of two types of lightweight concrete: claydite (light-weight expanded clay aggregate - LECA) concrete and sawdust (wood shavings) containing concrete. The first one is based on LECA produced in Western Ukraine and Moldova, for the second one sawdust of the common local coniferous trees was applied. There was used supersulphated cement composed of blast furnace granulated slag, phosphor-gypsum and Portland cement in the research. The...

Carbon footprint of bamboo particles, rice husk and wood shavings-cement composites

L. Caldas, M. Da Gloria, D. Santos, V. Andreola, M. Pepe & R. Toledo Filho
The growing concentration of greenhouse gases (GHGs) increases more and more the heat trapping in the atmosphere, leading to a rise in global temperatures, also known as global warming. For these reasons, in the last decade, in order to counteract this phenomenon, a special effort has been made also in the construction sector by developing new sustainable building materials and, moreover, one of the most promising solution is the possible employment of forest waste as...

Foreword

Sofiane Amziane
Welcome to this Special Issue of Academic Journal of Civil Engineering related to the conference organized each year by AUGC (The University - Association of Civil Engineering). The 34th meeting of universities in civil engineering has been organised by AUGC and the department ArGEnCo (Architecture, Geology, Environment and Construction) of the University of Liège were held in Liège (Belgium) from 25 to 27 May 2016 under the general theme: Building the city of the future.

Dépendance thermique des performances en fatigue des enrobés bitumineux

Rahma Ktari, Pierre Hornych, Ferhat Hammoum, Paul Marsac, Mai Lan Nguyen & Jean Michel Piau
Les niveaux de sollicitation et d’endommagement de la chaussée fluctuent en cours d’année. Le comportement en déformation et à la fatigue des matériaux bitumineux varient avec les cycles de la température. Cet article vise à traiter brièvement les résultats tirés de la bibliographie afin de déduire une loi d’évolution des performances en fatigue en fonction de la température. Une étude expérimentale sur une Grave Bitume de classe 3 (GB3), à des différentes températures a été...

Etude numérique du comportement des assemblages Voiles-Linteaux renforcés par un matériau composite

L. Madouni, M. Ould Ouali, H. Degée & N.E Hannachi
Le renforcement des structures en béton armé est souvent nécessaire en raison de charges extrêmes et excessives, de l’évolution des règlements de conception, d’un mauvais entretien ou de l'exposition aux effets environnementaux. La technique de renforcement par collage de polymères renforcés de fibres offre une réponse pertinente. Cette étude s’intéresse aux cas du système structural constitué de voiles couplés hybrides, ou La jonction entre les deux éléments voile-linteau constitue souvent une zone critique. L’objectif de...

Modelling of reinforced concrete RC frame using a simplified approach

Faroudja MEZIANI, Amar KAHIL, Aghiles NEKMOUCHE & Said BOUKAIS
The intent of this paper is to use a simplified finite element model to simulate the reinforced concrete frame by using Timoshenko beam elements for columns and beams and the modified Takeda model for the sectional behavior. The model takes into account the non-linear behavior of a reinforced concrete by introducing laws behavior that reflects the real behavior. A failure criterion that is based on the ultimate rotations of the element is associated with finite...

Investigation de l’influence des variables de conception sur le comportement des voiles courts en béton armé

Ali KEZMANE, Said BOUKAIS, Nacim KHELIL, Amar KAHIL & Aghiles NEKMOUCHE
La résistance ultime est la variable clé pour la conception et l'évaluation de la performance voiles courts en béton armé [WOO 90 ] [BRA 77] . L’évaluation précise de la résistance ultime est importante parce que les structures à voiles ou comportant des voiles sont susceptibles d'éprouver de multiples cycles de déformation pendant les tremblements de terre [LEF 90]. Les codes de dimensionnement, les manuels pratiques et la littérature fournissent un certain nombre d'équations pour...

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...

Bio-based rheology modifying agents

M. Azima, A. G. Guldogan & Z. B. Bundur
Advances in construction technology increased the importance of sustainability and reinforce the use of biological admixtures. Using bio-based admixtures brings new horizons to the construction material science by improving concrete properties through a more environmentally friendly and cost-efficient approach. Generally, bio-based additives are used as viscosity modifyin agents (VMAs) in concrete mixes. Traditional bio-based VMAs are water-soluble bipolymers that can be produced from polysaccharide-based biopolymers obtained from cellulose, starch or bacterial fermentation. Through the literature,...

Strength and stress-strain characteristics of coir fibre reinforced cement stabilised rammed earth

R. Sri Bhanupratap Rathod & B. V. Venkatarama Reddy
Rammed earth is a monolithic construction that involves dynamically compacting processed soil in progressive layers in a rigid formwork. Cement stabilised rammed earth (CSRE) is used for the construction of load bearing walls in buildings. CSRE walls predominantly undergo sudden catastrophic shear failure under compressive loading. Fibre reinforced composites show high ductility under compression and shear avoiding the sudden catastrophic failures of the structural elements. Hence, the present investigation was focused on the behaviour of...

Hygrothermal properties of light earth insulation materials: evaluation of uncertainties and consequences

T. Vinceslas, T. Colinart, H. Lenormand, A. Hellouin De Menibus, E. Hamard & T. Lecompte
Hygrothermal simulation of bio-based materials requires heat or moisture storage and transfer properties. Even if their determination is defined in numerous standards, characterization implies uncertainties. In this work, we aim to evaluate the uncertainties in the determination of heat and moisture storage properties of light earth insulation materials and of their constitutive raw materials (hemp shiv and earth). Heat thermal capacity is evaluated by Differential Scanning Calorimetry (DSC). Sorption isotherm is evaluated by gravimetric methods....

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...

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...

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...

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...

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...

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...

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