Mohamad Achour

ESTP | ESTP · Civil Engineering

Face à une augmentation des populations urbaines, face aux enjeux du réchauffement climatique dans les prochaines années, l’enjeu majeur de l’urbanisme durable est d’augmenter l’efficacité énergétique globale à l’échelle systémique des quartiers. L’analyse du cycle de vie demeure la méthode qui permet d’évaluer les impacts environnementaux des bâti...

The built environment is the most energy consuming and environmentally damaging sector, where it consumes more than two-thirds of the global energy and account for more than 70% of the global CO2 emissions (Hong et al., 2020). This has led to the increase in research on efficient ways to achieve sustainability in cities and develop tools to quantif...

The multi-scale modeling of Portland cement paste is addressed to predict simultaneously its stiffness and its effective diffusion coefficient of chloride ions. The heterogeneity of cement paste is handled thanks to a hierarchy of Eshelby-based homogenization schemes within the framework of micromechan-ics. The same microstructure description is us...

La corrosion des aciers peut être due au processus de carbonatation du béton induite par la baisse du pH de la solution porale. Ce papier propose un modèle physico-chimique pour décrire la pénétration du dioxyde de carbone durant la phase d'initiation de la corrosion des aciers. Cette pénétration peut être due à la présence d'une solution multi-esp...

Corrosion of steels in concrete structures is due to the penetration of chloride ions, carbon dioxide and moisture. A physico-chemical model is proposed to describe the coupled transport of chloride and carbon dioxide during the initiation phase of corrosion until depassivation of the steel. In order to clearly identify the transport parameters of...

La corrosion des aciers est l'une des principales causes de dégradation des ouvrages en béton armé, notamment en façade maritime. Cette dégradation est due à la diffusion d'ions chlorure qui peut se produire dans les ouvrages immergés dans l'eau de mer, ceux subissant des cycles de marnage et également ceux soumis aux embruns marins. La corrosion p...

The corrosion process is usually described into two periods that model the service life of the reinforced concrete structures such as bridges and other structures exposed to marine environments: 1) the initiation period and 2) the propagation period. The initiation period is the time required for aggressive substances (e.g., carbon dioxide, chlorid...

In this paper a physico-chemical model is developed to study the coupled transport of chloride, carbon dioxide and moisture into concrete. To predict the chloride profile in concrete, a new approach is proposed based on the Nernst-Planck's equation, which considers multi-species transfer of aggressive ions, including diffusion, migration, chemical...

La corrosion des armatures dans le béton armé est due à l'action des agents agressifs comme les ions chlorures, le dioxyde de carbone et l'humidité. Un modèle physico-chimique est proposé pour décrire la pénétration de ces agents pendant la phase d'initiation de la corrosion jusqu'à la dépassivation de l'acier. Afin d'identifier clairement les para...

In this paper, the effects of carbonation and moisture on chloride and ionic transport into concrete are studied. Based on the concrete composition and porosity as well as the physicochemical equilibrium, a comprehensive macroscopic model is proposed for this problem. The model features the chemical activity of ions, the interactions between chlori...

Based on the concrete composition and porosity as well as the physicochemical equilibria, a macroscopic model is proposed to study the influence of carbonation on the transport of chloride ions into unsaturated concrete. The model features the transport of ions by diffusion, convection, chemical activity of ions, interactions between chloride ions...

L’attaque des chlorures et la carbonatation sont les mécanismes prédominants régissant la durée de vie des structures en béton armé. Afin d’évaluer la durée de vie de ces structures contre la pénétration du dioxyde de carbone, des ions chlorures et de l’humidité, un modèle physico-chimique est proposé. Le modèle est développé en prenant en compte l...

Chloride attack and carbonation are the predominant degradation mechanisms governing the service-life of reinforced concrete structures. In order to evaluate the service-life of these structures against the penetration of carbon dioxide, chloride ions and moisture, a physico-chemical model is proposed. The model is developed by taking into account...