648 Works

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...

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...

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...

Towards field-oriented tests to evaluate the workability and cohesion of earth slips for building applications

T. Vinceslas, T. Lecompte, H. Lenormand, A. Hellouin De Menibus, E. Hamard & T. Colinart
Hemp-clay concrete for building thermal insulation can be made of earth available on-site, obtained from earthworks or ancient clay building deconstruction. Craftsmen evaluate qualitatively the slip binding capacity in order to optimize and control the formulation with simple field oriented tests. There is a need for scientific works to understand the rheological behavior of clay slips depending on all the parameters that can vary on-site, such as the water to clay ratio, the clay activity,...

Partial replacement of cement by combination of fly ash and metakaolin in bamboo bioconcretes

V. M. Andreola, M. Y. Rajiv Da Gloria, D. O. Justo Dos Santos & R. D. Toledo Filho
During the Portland cement manufacture, it is known that an average of one ton of CO2 is released per ton of cement produced. Consequently, the materials with high cement consumption have negative environmental impacts. One of these materials is the bio-concrete of bamboo, which is basically constituted of bamboo particles, an average of 800 kg/m3 of cement, and presents around 9 MPa of compressive strength. In this work, a partial replacement of cement with fly...

Various methods of binding light agricultural byproducts

F. Bacoup, A. Mahieu, A. Vitaud, P. Drone, R. Gattin & N. Leblanc
A lot of porous agricultural byproducts have few valorization possibilities and are mainly used as animal litter. In order to propose more valuable applications for these byproducts, research is being carried out to use these resources in particleboards for application as building materials for insulation or flooring underlayer, or as molded cushioning for packaging or horticultural support medium for example. The objective of this study is to investigate the potential of low density materials obtained...

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...

Une analyse dynamique des interactions entre acteurs portuaires et leurs effets sur l’efficience d’un port pétrolier

Emna Belaid, Philippe Rigo & Mario Cools
Le port est une entité hétérogène qui regroupe un ensemble d’acteurs dont les objectifs sont parfois contradictoires. L’analyse de leurs interactions permet de comprendre le mécanisme qui régit la gestion portuaire. Ce mécanisme influence la performance du port. Dans cet article, nous analysons l’efficience portuaire selon un modèle dynamique. Ce dernier est basé sur un cadre conceptuel établi selon une analyse systémique. Les simulations effectuées montrent que les paramètres « vitesse de chargement » et...

Registration Year

  • 2020
    648

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