Thierry Sedran

Thierry Sedran
Université Gustave Eiffel · Laboratoire Matériaux pour Infrastructures de Transport (MIT)

Phd

About

68
Publications
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Publications

Publications (68)
Chapter
This study concerns the use of numerical models to analyze and compare the cracking process of two types of Railway Tracks: one in reinforced concrete and the second one in FRC. The models used are the Probabilistic Explicit Cracking models developed by IFSTTAR and fully validated in the framework of previous works. The main result obtained can be...
Article
The use of recycled aggregate (RA) to produce recycled aggregate concrete (RAC) is a proven way of decreasing the consumption of natural aggregate (NA) and the landfilling of construction and demolition waste. However, adoption of codes for the design of RAC and RAC structures has been lacking. Within the framework of the new fib Model Code 2020 an...
Article
This paper investigates bacteria colonisation through biofilm formation, based on the premise that biofilm helps bacteria to have a better development. The aim is to homogenize bacterial growth on recycled concrete aggregates (RCA) to obtain a homogeneous precipitation of calcium carbonate (CaCO 3 ). In previous studies, Bacillus halodurans C-125 w...
Chapter
This section starts with Chapter 14 that describes how the current standardization accounts for the recycled concrete aggregates (RAs) and their use in new concrete. The chapter focuses on the European context, and sometimes more specifically on the French one. It is observed that the standardization is often conservative and strongly limits the re...
Chapter
Many methods of concrete mix design, often empirical, exist worldwide. Because of their particular properties, presented in the other chapters of the present book, the introduction of recycled aggregates (RA) requires adaptations of these methods. This chapter makes first a summary of these particular properties of the RA and the expected qualitati...
Chapter
The specification of concrete, in terms of EN 206:2013, is defined as the final compilation of documented technical requirements given to the producer in terms of performance or composition, including the constituents. This standard considers the use of recycled concrete aggregates (RA) but in quite different ways in the various national provisions...
Chapter
This chapter describes, through a theoretical approach, how the multi-recycling may change the concrete properties after more than one recycling cycle. By using different empirical models linking the concrete mix proportions to some of their properties, the partial recycling and the number of recycling cycles effects on different properties are con...
Chapter
In 2005, a concrete water treatment plant at Saint Cloud in the Paris region was partially demolished, and then rebuilt. At this occasion 6000 tons of 0/20 mm recycled concrete aggregates (RA) were produced on site. The public owner of the facility was very keen that all these materials be recycled on site to save natural resources, and more genera...
Chapter
Delayed deformations of concrete are known to induce a risk of cracking in structures and excessive bending. Delayed deformations are mainly of two types: shrinkage and creep. The shrinkage tests were carried out for two substitution rates of natural aggregates with 30% and 100% recycled aggregates (RA). State-of-art and the experimental results sh...
Chapter
This chapter describes the influence of the introduction of recycled aggregates (RA) on the instantaneous properties of concrete. In the first part, existing models linking compressive and tensile strength and elastic modulus of natural aggregates concretes (NAC) to their mix design are validated and adapted for recycled aggregates concrete (RAC)....
Article
Classical techniques for backfilling of trenches use unbounded materials. Unfortunately, they have always been presenting several drawbacks: difficulty of compaction, noise disturbance and time of implementation... Controlled Low Strength Materials (CLSM) could be a good alternative thanks to their fluidity and cementitious setting, provided that t...
Article
This paper describes research done on a new testing device including its laboratory test procedure; namely, a laboratory punching test for cementitious backfill materials that evaluates their excavatability with a pick. Three-dimensional and two-dimensional numerical studies using a finite element method were carried out according to calibrated par...
Article
At the beginning of 2013, a new ballastless track structure (designed and tested in laboratory) based on concrete slabs was built in France. Since December 2013, several trains circulate every day and a monitoring of some sections of the structure is performed continuously. Data collected are compared to the results of finite element simulations us...
Method
Full-text available
Les matériaux granulaires traités avec un liant hydraulique présentent un intérêt certain en comblement de tranchées, et notamment pour éviter les problèmes de post-compactage. Dans un grand nombre de cas, ces matériaux doivent toutefois rester faciles à excaver à la pioche, pour que les gestionnaires puissent intervenir sur leurs réseaux, rapideme...
Article
La production de carbonates de calcium par les bactéries est un processus utilisé dans différents domaines. Ce procédé de biocarbonatation a d'abord été étudié et employé pour traiter les pierres ornementales calcaires dans le but de les préserver et de les réparer. Des recherches ont ensuite été menées afin d'utiliser cette capacité des micro-orga...
Article
Full-text available
The European Direct-mat project provided a significant contribution to increasing recycling reclaimed road wastes. Part of the project was dedicated to the recycling of various reclaimed road materials in new hydraulically bound layers. This paper summarises the results of the project and the activities of the eight contributing European countries....
Article
This paper is based on a development over the past 5 years in France which culminated in 2013 with the construction of a demonstration of this ballastless trackform on the French network north of Paris. In this paper, we summarise the history of this development, ≪New Ballastless Track≫ (NBT) through the conceptual design phases, the extensive labo...
Conference Paper
A new ballastless track structure based on concrete slabs (designed and tested in laboratory) was built in France at the beginning of 2013 and is in service since the December 2013. To verify the numerical model, a monitoring of sections of the structure is performed continuously. Data collected were compared to the results of finite element simula...
Conference Paper
Increasing economic pressure is leading railway infrastructure companies worldwide to trim their life cycle costs and increase the availability of their tracks. In this way, the ongoing comparisons between ballasted track and nonballasted track are leaning more and more frequently towards the latter, although the construction costs and durations ar...
Chapter
La résistance mécanique d'un béton dépend en premier lieu de sa formule et en particulier de son rapport massique Eau /Ciment. Toutefois elle diminue rapidement si la teneur en air résiduelle après mise en oeuvre augmente. Ainsi, si les moyens de mise en oeuvre ne sont pas adaptés à la consistance d'un béton pour assurer son compactage, cela peut c...
Article
Pick excavatability of controlled low-strength materials was experimentally studied to circumvent the fact that current classification systems or empirical excavatability criteria lack relevance (they do not refer to digging facilities and depend on the mix design and the granular skeleton of the material). Manual excavation is separated into two s...
Article
Ballastless track structure are presently seen as an attractive alternative to conventional ballast. A new model was designed and a real-scale mockup was built and tested in fatigue test at IFSTTAR laboratory. To verify numerical simulations, the railway structure was monitored by conventional strain gages. A distributed fiber-optic strain sensing...
Conference Paper
An innovative material, called Grooved Fibre-Reinforced Ultra-High Performance Concrete (GFRUHPC) is presented in this paper. In the framework of an international OECD project, supported by a French ANR project, the aim was to develop an hydraulic material for long lasting wearing courses, devoted to highly trafficked road sections. The current sol...
Chapter
This chapter presents some results concerning the recycling of a particular ultrahigh performance fiber-reinforced concrete (UHPFRC) called Ceracem®, which includes calcined bauxite aggregate and high steel fiber content. It describes a method for characterizing the sand in order to include it in a rational concrete mix design method. The chapter p...
Article
By definition, a removable urban pavement (RUP) can be quickly opened and closed, using lightweight equipment, for easy access to underground networks. The premises of the concept can be found in certain military paths or industrial soils. According to a survey conducted among French municipal authorities, the RUP concept could decrease the public...
Article
For some critical road sections, a high skid resistance of wearing course is required to minimise the risk of traffic accidents. Nowadays this skid resistance is mainly brought by the use of special aggregates as calcined bauxite, a scarce and expensive material. The paper presents a patented technology, where a special high-performance mortar is p...
Conference Paper
Full-text available
The paper presents a review of recent works dealing with application of high-performance (HPC) or ultra-high-performance concrete (UHPC) in pavement technology. It is first shown that these materials exhibit a number of attractive properties for this type of applications, which must be balanced by difficulties encountered on site. Then, the state-o...
Conference Paper
Full-text available
As a general feedback of most studies and site experiments, the lower the maximum size of aggregate, the lower the rolling noise for exposed aggregate concrete roads. Yet, a small size of aggregate increases the cement demand, and by the way the unit cost of concrete. This is a supplementary barrier for the use of concrete as a wearing course. In...
Conference Paper
Full-text available
In the context of structural heritage preservation, monitoring and durability diagnosis by means of non destructive (ND) techniques becomes a more and more important question. In order to establish the empirical and physical relationships between the ND results and the durability indicators of various concretes, an experimental program specially ad...
Article
In many countries there is a trend to recycle wastes obtained during pavement maintenance or reconstruction, and to forbid the landfill of these products. Thus, in some circumstances it can be tempting to use reclaimed asphalt pavement (RAP) in new hydraulic concrete mixtures. This paper presents experimental data and modelling about the effect of...
Conference Paper
Full-text available
This research is part of a thesis which consists in defining the excavatability of Controlled Low-Strength Materials for trenches (not exceeding 8 MPa). This communication deals with a mortar containing a high volume of air entrained and a cementitious granular material which are both self-compacting. We present their composition and the characteri...
Article
Full-text available
The scientific method applied to concrete mix design, as developed by LCPC and introduced into the BetonlabPro software over the past several years, is based on granular concepts; for this reason, BetonlabPro users need to know about packing density for all elementary granular fractions, especially for mineral powders (cements, mineral additions, e...
Article
Full-text available
La méthode scientifique de formulation des bétons, développée par le LCPC et mise en oeuvre dans le logiciel BétonlabPro depuis plusieurs années, est fondée sur des concepts granulaires. C'est pourquoi l'utilisation de ce logiciel nécessite la connaissance de la compacité de l'ensemble des fractions granulaires élémentaires, et notamment celle des...
Article
Full-text available
Les nouveautés introduites dans le logiciel BétonlabPro 3 par rapport à la version 2 diffusée en 2000 sont présentées. Cet outil permet d'identifier des constituants, d'alimenter une base de données et d'étudier des mélanges de diverses combinaisons des constituants pour obtenir un béton satisfaisant à un cahier des charges donné. En termes de nouv...
Article
Full-text available
The new features introduced into the BetonlabPro 3 software package since the 2000 release of Version 2 are presented herein. This tool allows identifying components, expanding a database and examining the mixes of various combinations of components in the aim of deriving a concrete that satisfies a given set of specifications. In terms of new comp...
Conference Paper
By definition, a removable urban pavement (RUP) can be quickly opened and closed, using lightweight equipment, for easy access to underground networks. The premises of the concept can be found in certain military paths or industrial soils. According to a survey conducted among French municipal authorities, the RUP concept could decrease the public...
Technical Report
Full-text available
The highway traffic size and loads have been continuously increasing all over Europe. At the same time, the expectations of users have been growing. They need more safe, durable and comfortable highway surfaces which make their trips low-cost and do not accept frequent traffic disturbance due to road maintenance and rehabilitation. The obvious answ...
Conference Paper
Full-text available
The paper gives an overview of three recent research projects carried out at LCPC (Central Laboratory for Roads and Bridges, Nantes, France), dealing with concrete pavement. In the first one, a laboratory fatigue test was developed in order to measure the toughness of interface in composite pavement structures, having a Portland cement concrete bas...
Article
This paper describes a joint research project about concrete pumping. After a careful literature review was carried out, an experimental 148 m-closed-loop pumping circuit was built near Roissy, France. Over 68 concrete loads were pumped - a number of which were subject to blockage. These experiments led to significant advances in the understanding...
Article
Pumping is a common process to transport fresh concrete. To date, however, there is no rigorous, scientifically based method to design a pumping circuit that is to predict the relationship between pressure and flow rate as a function of circuit dimensions and fresh concrete behavior. Such a method was developed and is presented in this paper. A 150...
Conference Paper
Full-text available
In France, purification of gazes produced by incineration of household waste generates more than 300 000 tons a year of solid residues. Considered as ultimate and hazardous waste they must therefore be stored in a specific so-called Class I confined landfill after stabilization with hydraulic binders. The cost of this solution incites some companie...
Conference Paper
Full-text available
In France, maintenance of road surface layers generates approximately two million tons of reclaimed asphalt pavement (RAP) a year of which less than 10 % is recycled into road materials. In this context, a research has been initiated three years ago at LCPC in collaboration with ATILH to develop recycling of RAP into pavement hydraulic concrete. In...
Method
Full-text available
In french only - 11 pages - ISSN 1167-489X - Summary: The test proposed in this document is intended to measure the packing density of a particle fraction with predetermined mass when submitted, within a cylinder, to a defined mechanical loading. The operating mode presented herein is applicable to aggregates of either natural or artificial origin...
Article
Full-text available
The development of a method for measuring the packing density of aggregate fractions is presented and discussed herein. This method has been especially intended to provide input for the software application aimed at assisting with the mix design of concrete and other granular materials used in civil engineering. The article begins by demonstrating...
Article
Full-text available
The paper presents a new approach to design concrete mixtures. It is based upon a set of models relating composition and engineering properties of concrete, to be implemented into software, linked with a material database. The principles underlying the various models are summarized, most of which focus on the granular structure of fresh/hardened co...
Conference Paper
Full-text available
Pumping is a technique for transporting fresh concrete, bringing in the material to the formwork without using a tipper truck or conveyor belt. As compared to other techniques, there are many advantages, among them, ease of application, access to difficult locations, etc. Furthermore, for self-compacting concrete, pump injection at the base of the...
Article
Full-text available
Roller-compacted concrete (RCC) is typically used in the building of dams, road pavements and storage facilities (especially in Canada). Speed of placing, a low cement content and the potential use of mineral admixtures (fly ash, limestone fillers, mining residue, etc.) combine to provide the construction industry with a highly-economical building...
Technical Report
Full-text available
The American Concrete Institute (ACI) sub-committee 236A, “Workability ofFresh Concrete,” immediately was faced, upon its creation in fall 1999, with how to determine appropriate methods to measure concrete workability. The material science-based approach to measure workability would be to use a concrete rheometer. There are several rheometers used...
Article
Full-text available
Cet article présente un ensemble de modèles permettant la formulation des bétons et leur pendant informatique, le logiciel BetonlabPro
Conference Paper
Full-text available
Self Compacting Concrete (SCC) technology is spreading worldwide since the last years. A number of practical methods have been proposed to design such concrete but they generally require a great number of laboratory trials or do not permit a rapid and precise concrete optimization. Yet, such an optimization is necessary to limit the paste volume in...
Article
Some preliminary results of an experimental program on the rheological behavior of fresh concrete are presented. In the rheological tests, performed with a plane-to-plane rheometer, it appears tha the relationship between torque and rotation speed is not exactly linear. The fresh concrete behavior is better described by the Herschel-Bulkley model:...
Article
This article describes the development of apparatus designed to characterize the rheological behavior of fresh concrete, both in the lab and on site, in the range of consistency from soft to fluid. The principles that governed the design of the rheometer are first recalled. It is a torsional rheometer, in which a sample shaped like a hollow cylinde...
Article
An investigation was performed on the objectivity of a new rheometer for soft-to-fluid concrete, called BTRHEOM. Firstly, the influence of concrete wall friction on the measurement of the Bingham constants was studied by finite-element simulations. It has been shown that this influence is limited, in particular on the measurement of shear yield str...
Article
The Laboratoire Central des Ponts et Chaussees (LCPC), Paris, France conducted a long-term research project aimed at creating software for computer-aided mix design. Within the MS-Windows environment, two programs for designing concrete mixes were developed for IBM-PC compatible computers. The success encountered by both programs (Betonlab and Rene...
Conference Paper
Full-text available
Self-Compacting Concrete (SCC) has been spreading worldwide in recent years. However, few efficient and sound mix-design methods have been proposed that can take account of the actual geometry of the structure, including the reinforcement. The Laboratoire Central des Ponts et Chaussées (LCPC) has recently developed two powerful tools, BTRHEOM™ and...
Article
Full-text available
Une nouvelle génération de bétons venant du Japon est apparue ces dernières années : les bétons autonivelants (BAN). Ces bétons sont très fluides et se mettent en oeuvre sous le seul effet de la gravité, donc sans apport de vibration, même dans des coffrages complexes et très encombrés, tout en donnant un produit final homogène. L'expérience japona...
Article
The concept of high packing density has been recently rediscovered, as a key for obtaining ultra-high-performance cementitious materials. First, this paper presents two models allowing to predict the packing density of a particle mix. These models are derived from the Mooney's suspension viscosity model. At a second step, considerations on the para...
Article
Full-text available
Résumé Cet article présente le logiciel René-LCPC développé sous Windows™, qui met en oeuvre, de façon très conviviale, le Modèle de Suspension Solide développé au LCPC. Ce modèle permet de calculer la compacité d'un mélange granulaire quelconque, et la viscosité de toute suspension à concentration donnée de ce mélange, à partir de grandeurs aiséme...
Article
Full-text available
Cet article présente le logiciel René-LCPC développé sous Windows™, qui met en oeuvre, de façon très conviviale, le Modèle de Suspension Solide développé au LCPC. Ce modèle permet de calculer la compacité d'un mélange granulaire quelconque, et la viscosité de toute suspension à concentration donnée de ce mélange, à partir de grandeurs aisément acce...
Article
Full-text available
Le modèle présenté dans cet article fournit une prévision de la compacité d'un mélange de grains secs, à partir des paramètres suivants : • les compacités des classes unimodales ; • la granularité du mélange ; • la viscosité de référence, grandeur caractéristique du mode de mise en place de l'échantillon (d'autant plus élevée que la compaction est...
Article
Full-text available
Dans ce deuxième article, la validation du modèle de suspension solide est effectuée par comparaison prévisions/expérience portant sur des mélanges divers, étant donné : originaux ou tirés de la • l'origine des résultats littérature ; • la distribution granulaire : mélanges binaires, ternaires, granularites discontinues à six classes, granularité...
Thesis
Cette etude vise a definir le potentiel du beton projete par voie humide pour l'obtention de reparations minces durables ainsi que l'interet d'un ajout eventuel de fumee de silice, de macrofibres ou microfibres d'acier. La durabilite d'une bonne reparation mince passant par une bonne qualite intrinseque du beton de reparation et par une bonne adher...

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