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Zoubeir Lafhaj

Bio: Zoubeir Lafhaj is an academic researcher from École centrale de Lille. The author has contributed to research in topics: Brick & Computer science. The author has an hindex of 19, co-authored 77 publications receiving 1394 citations. Previous affiliations of Zoubeir Lafhaj include Lille University of Science and Technology & Centre national de la recherche scientifique.


Papers
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Journal ArticleDOI
TL;DR: In this paper, a simple model is proposed to relate ultrasonic pulse velocity with porosity and permeability, and experimental results are shown and correlations between the measured parameters of the material are discussed.

269 citations

Journal ArticleDOI
TL;DR: In this article, eight samples cored from the same mortar were used to investigate their respective gas, ethanol and water permeability, and two gas and liquid permeability cells, using special devices for measuring the injected flow under steady conditions, were designed and presented in this paper.

190 citations

Journal ArticleDOI
TL;DR: Results obtained showed that the substitution of quartz sand by treated sediment resulted in a significant increase in brick compressive strength and firing shrinkage, and in a decrease in porosity and water absorption, and substituted bricks can be regarded as non-hazardous material.

140 citations

Journal ArticleDOI
TL;DR: In this article, the authors presented results of studies on the valorisation of polluted river sediments from the North region of France, where treated sediments were used as a brick making raw material.

109 citations

Journal ArticleDOI
TL;DR: In this article, the Novosol® process is used for the treatment of polluted sediments, which is based on the stabilisation of heavy metals and on the thermal elimination of organic matter.
Abstract: The disposal of contaminated dredged material has become an economical and environmental issue. Firstly, this study presents the Novosol® process which was used for the treatment of polluted sediments. This process is based on the stabilisation of heavy metals and on the thermal elimination of organic matter. A physical characterization of the processed material reveals high porosity (60%) and water absorption (45%). Moreover, the treated sediment aggregate (TSA) has a relatively low strength and a high content of fine particles. Secondly, an experimental study on the feasibility of TSA introduction in cement-based materials was performed. Three mortars for which a given sand volume was replaced by the same sediment volume (33%, 66% and 100%) were designed. A strong increase of drying shrinkage was observed (up to 10 times higher, when compared to a reference mortar). Permeability remained virtually constant, though. There was a significant increase in strength for low to moderate substitution, while high incorporated quantity of sediment led to a strength on the same order of that of the reference mortar.

89 citations


Cited by
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Journal ArticleDOI
TL;DR: In this paper, the authors present the techniques, advances, problems and likely future developments in numerical modelling for rock mechanics and discuss the value that is obtained from the modelling, especially the enhanced understanding of those mechanisms initiated by engineering perturbations.

976 citations

Journal ArticleDOI
TL;DR: A state-of-the-art review of research on utilization of waste materials to produce bricks can be found in this article, which can be divided into three general categories based on the methods for producing bricks from waste materials: firing, cementing and geopolymerization.

551 citations

Journal ArticleDOI
TL;DR: A classification framework to understand what indicators measure is proposed and none of the analysed indicators focuses on the preservation of functions.
Abstract: Circular Economy (CE) is a growing topic, especially in the European Union, that promotes the responsible and cyclical use of resources possibly contributing to sustainable development. CE is an umbrella concept incorporating different meanings. Despite the unclear concept, CE is turned into defined action plans supported by specific indicators. To understand what indicators used in CE measure specifically, we propose a classification framework to categorise indicators according to reasoning on what (CE strategies) and how (measurement scope). Despite different types, CE strategies can be grouped according to their attempt to preserve functions, products, components, materials, or embodied energy; additionally, indicators can measure the linear economy as a reference scenario. The measurement scope shows how indicators account for technological cycles with or without a Life Cycle Thinking (LCT) approach; or their effects on environmental, social, or economic dimensions. To illustrate the classification framework, we selected quantitative micro scale indicators from literature and macro scale indicators from the European Union 'CE monitoring framework'. The framework illustration shows that most of the indicators focus on the preservation of materials, with strategies such as recycling. However, micro scale indicators can also focus on other CE strategies considering LCT approach, while the European indicators mostly account for materials often without taking LCT into account. Furthermore, none of the available indicators can assess the preservation of functions instead of products, with strategies such as sharing platforms, schemes for product redundancy, or multifunctionality. Finally, the framework illustration suggests that a set of indicators should be used to assess CE instead of a single indicator.

517 citations

Book
28 Oct 2002
TL;DR: Porous Materials Water in Porous Materials Flow in porous materials Unsaturated Flows UnSaturated Flow in Building Physics Composite Materials Evaporation and Drying Topics in Water Transport Appendices Symbols Used Properties of Water Minerals, Salts and Solutions Other Liquids Other Data as mentioned in this paper
Abstract: Porous Materials Water in Porous Materials Flow in Porous Materials Unsaturated Flows Unsaturated Flow in Building Physics Composite Materials Evaporation and Drying Topics in Water Transport Appendices Symbols Used Properties of Water Minerals, Salts and Solutions Other Liquids Other Data

515 citations

Journal ArticleDOI
TL;DR: In this paper, the authors present the techniques, advances, problems and likely future development directions in numerical modeling for rock mechanics and rock engineering, as well as a review of the current state of the art.

510 citations