
Thomas SanchezUniversité de Lyon
Thomas Sanchez
PhD Civil Engineering
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Publications (25)
Titre : Projet Vivaldi-Développement de structures modulaires en béton de bois. Informations générales Lieu de travail : LYON Type de contrat : CDD Scientifique Durée du contrat : 8 à 10 mois suivant date d'embauche Date d'embauche prévue : dès que possible Quotité de travail : Temps complet Rémunération : Entre 2320€ et 3839€ bruts mensuels selon...
This study focuses on developing a numerical model for the multi-ionic transport process in ordinary concrete (OC) and ultra-high-performance fiber-reinforced concrete (UHPFRC) in its sound and microcracked states. The theoretical background of multi-ionic transport was reviewed from the literature, and extended governing equations considering the...
This work aims at investigating the effect of multiple microcracks in Ultra-High Performance Reinforced Concrete (UHPFRC) occurring in service conditions on the apparent chloride diffusion which is critical to guarantee the design lifetime. First, series of preliminary static bending tests were carried out on three UHPFRC beams to characterize thei...
Ultra-high performance concrete (UHPC) is a promising means to foster sustainable and resilient civil infrastructures as it allows reducing concrete volume, while enhancing structural performance and durability. However, UHPC applications are often limited by its high cost and by the availability of raw materials. This study aims to engineer a nove...
The degradation of a concrete structure in northern climate is mainly due to the corrosion of steel reinforcements and cumulative damages from mechanical loading. Infrastructure managers heavily rely on ratings obtained from visual field surveys and the interpretation of inspection reports to predict the future structure states and to plan appropri...
Northern countries are submitted to extremely cold temperatures in winter. A huge amount of de-icing salt is used during that time to improve user safety on roadways. Consequently, most of de-icing salts, which are chloride based, lead to the degradation of the exposed structures through corrosion. In this paper, laboratory experiments and their du...
Ultra-high performance concrete (UHPC) is a class of cement-based composites with enormous potentials for sustainable construction thanks to its outstanding compressive strength and cracking resistance. While the former allows saving material volumes and reducing the structural weight, the latter confers unprecedent durability. However, one of the...
In this paper, the sorption behavior of Ultra High-Performance Fiber Reinforced Concrete (UHPFRC) is experimentally investigated. As UHPFRC has a very low permeability, the sorption measurement presents an interesting challenge and has required the modification and optimization of the Dynamic Vapor Sorption Method (DVS) already applied for ordinary...
In this study, the importance of capillary suction was emphasized through its implementation in a hygrothermal transport model used to predict water transport in ordinary concrete. In the model, heat transfer is described by the classical Fourier equation. In addition, the homogeneous vapor diffusion is modeled using a gradient-driven Fick's law, a...
The objective is to modify the conventional migration test from the perspective of assessing the transfer parameters of radionuclides, in cementi-tious materials through their stable isotopes. The French standard procedure designed for assessing chloride ions diffusivities in cementitious materials has been adjusted: (i) the diffusing species conce...
This paper presents a new 2D water transport model considering capillary suction to predict the water content evolution in the concrete porosity. The basic formulations of the model are illustrated, and a switching algorithm is introduced to simulated wet-drying effects. Two specific absorption tests are studied to validate this model. The first te...
The durability of structures is greatly affected by their level of exposure to environmental and climatic conditions. In the case of northern structures, a major factor of deterioration is the corrosion of reinforcing steel due to the ingress of chloride ions from deicing salts during the winter season. The rate of penetration of chloride ions is a...
Spent pot lining (SPL) is an industrial waste generated from aluminum electrolysis cells. LCLL-ash is the inert by-product coming from the treatment of the SPL refractory fraction at the SPL treatment plant (Jonquière, Canada). LCLL-ash has been ground to the fineness of the cement to substitute a part of cement in cement pastes. However, LCLL-ash...
Structural inspection often requires slowing down the traffic during the operation by limiting the number of passing vehicles or deviating the traffic. One of the possible inspection techniques is by laser scanning. Because of the high cost of use and data treatment, the laser technique is mainly applied either in specific structures or structures...
The transport of chloride ions in concrete structures is not only due to diffusion but also to the advective effects of water movements and capillarity, mostly present with wet-dry cycles. These last two phenomena are currently very poorly modelled. A new system based on optical fibres was previously developed to measure the free chloride concentra...
Ultrahigh-performance fiber-reinforced concrete (UHPFRC) is endowed with outstanding durability. The first results of accelerated migration tests with an adapted procedure highlighted a very low chloride permeability profiles for undamaged UHPFRC with organic and metallic fibers. However, some of the samples with steel fibers showed useless results...
An improved numerical method as regard with the widely used analytical approximation is presented for determining the transport properties from electro-diffusion tests. Based on the geochemical software PhreeqC, this study aims to better understand and quantify the part of each phenomenon in the diffusion process: (i) the geometrical material prope...
Currently, facility managers are faced with many advanced decisions regarding when and how to inspect, maintain, repair, or renew existing facilities in a cost-effective manner. The evolution of the deteriorations of road structures in reinforced concrete depends on the exposure of the elements to water in liquid form or vapour and to other aggress...
Corrosion that is induced by the presence of chloride ions in reinforced concrete structures is an important cause of premature degradation. This phenomenon has a high economic and ecological impact, especially near coastal areas and in countries where de-icing salts are used for road safety during winter periods. The transport of chloride ions in...
Accelerated migration tests which are commonly used to measure chloride diffusion in ordinary cement-based materials cannot be directly applied to composite with very low permeability, such as Ultra High-Performance Fiber Reinforced concretes (UHPFRC). In order to assess the UHPFRC enhancement on the structural durability, there is a critical need...
Dans le cadre du projet Cigeo (centre industriel pour le dépôt géologique de déchets radioactifs), le comportement diffusif des radionucléides dans les matériaux cimentaires est un sujet d’étude de l’Andra. Après la fermeture du site d’entreposage de déchets radioactifs, les radionucléides se retrouveront à terme en solution sous forme d’ions. Ils...