Author
Laurie Buffo-Lacarrière
Other affiliations: Intelligence and National Security Alliance
Bio: Laurie Buffo-Lacarrière is an academic researcher from University of Toulouse. The author has contributed to research in topics: Creep & Orthotropic material. The author has an hindex of 9, co-authored 16 publications receiving 439 citations. Previous affiliations of Laurie Buffo-Lacarrière include Intelligence and National Security Alliance.
Papers
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TL;DR: In this paper, the hydration of slag in blended cements is investigated through the measurement of hydration reaction indicators such as portlandite content, non-evaporable and free water, and hydration heat.
Abstract: In this paper, the hydration of slag in blended cements is investigated through the measurement of hydration reaction indicators such as portlandite content, non-evaporable and free water, and hydration heat Three substitution rates of cement by slag were used (30%, 50% and 70%) The tests were performed at two constant temperatures (20 °C and 40 °C) in order to assess the activation energy of the different components A multiphasic hydratation model is proposed to take account of the difference of kinetics of each main phase (clinker and slag) and the hydration kinetic law proposed considers interactions between the two phases It includes the activation of the dissolution of slag by alkalis released by the clinker phases in the pore solution, the portlandite consumption by slag and the effect of temperature and moisture content on the reaction kinetics The model is able to simulate the evolution of hydration products and adjust the hydration product stoechimetry to the rates of slag and the current temperature automatically and instantaneously Its reliability is shown through its ability to fit the whole experimental plan results with a single parameter set Among these parameters are the hydration heat of slag and its water consumption The model and its parameters should be useful to simulate other types of slag-blended cement
172 citations
TL;DR: In this paper, a selection of experimental results of creep tests found in the scientific literature are used to highlight the nonlinearity, multi-axiality, hydration, and thermal and drying effects.
107 citations
TL;DR: In this paper, a model predicting the development of hydration and its consequences on temperature and water content is presented, which is a promising tool to evaluate the temperature, hydric and hydration fields of structures in situ.
65 citations
TL;DR: In this article, the authors proposed a model for cracks opening and reclosure management based on a displacement formulation, which is easy to implement in most of the finite element codes based on displacement formulation.
47 citations
TL;DR: In this article, the application of the orthotropic damage model described in the accompanying paper (Part I) is concerned with several theoretical cases illustrating model's abilities to treat unilateral behaviour aspect, anisotropic loading and non radial loading pass.
27 citations
Cited by
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TL;DR: In this article, a set of experiments using different amounts of phase change materials (PCM) in self-compacting concrete mixes is presented, and it is shown that increasing PCM amounts lead to lower thermal conductivity and increased heat capacity, which significantly improve the thermal performance of concrete and therefore save energy.
Abstract: In order to come to a sustainable built environment the construction industry requires new energy saving concepts. One concept is to use Phase Change Materials (PCM), which have the ability to absorb and to release thermal energy at a specific temperature. This paper presents a set of experiments using different amounts of PCM in self-compacting concrete mixes. The study focuses on the direct mixing of micro-encapsulated PCM with concrete and its influence on the material properties. Therefore, the fresh concrete properties and the hardened properties are investigated. The hardened properties comprise strength tests and a thorough assessment of the thermal properties. It will be shown that increasing PCM amounts lead to lower thermal conductivity and increased heat capacity, which both significantly improve the thermal performance of concrete and therefore save energy. On the other hand a significant loss in strength and micro-structural analysis both indicate that a large part of the capsules is destroyed during the mixing process and releases its paraffin wax filling into the surrounding matrix. However, the compressive strength of our specimens still satisfies the demands of most structural applications.
407 citations
TL;DR: In this article, the authors investigated the hydration degree of cement pastes containing blast furnace slag and limestone filler, and proposed a modified thermogravimetric analysis (TGA) method based on the direct estimation of the amount of mineral additives contributing to hydration reactions.
192 citations
TL;DR: In this paper, the hydration of slag in blended cements is investigated through the measurement of hydration reaction indicators such as portlandite content, non-evaporable and free water, and hydration heat.
Abstract: In this paper, the hydration of slag in blended cements is investigated through the measurement of hydration reaction indicators such as portlandite content, non-evaporable and free water, and hydration heat Three substitution rates of cement by slag were used (30%, 50% and 70%) The tests were performed at two constant temperatures (20 °C and 40 °C) in order to assess the activation energy of the different components A multiphasic hydratation model is proposed to take account of the difference of kinetics of each main phase (clinker and slag) and the hydration kinetic law proposed considers interactions between the two phases It includes the activation of the dissolution of slag by alkalis released by the clinker phases in the pore solution, the portlandite consumption by slag and the effect of temperature and moisture content on the reaction kinetics The model is able to simulate the evolution of hydration products and adjust the hydration product stoechimetry to the rates of slag and the current temperature automatically and instantaneously Its reliability is shown through its ability to fit the whole experimental plan results with a single parameter set Among these parameters are the hydration heat of slag and its water consumption The model and its parameters should be useful to simulate other types of slag-blended cement
172 citations
TL;DR: This paper reviewed experimental and theoretical studies related to cement hydration and microstructure development that have been published within the four years of the interim period between the 12th and 13th International Congress on the Chemistry of Cement.
162 citations
TL;DR: In this paper, the carbonation kinetics dependence on CO2 pressure is considered through two underlying functions including, for the first, the dependence of the CSH carbonation rate on the pressure and, for instance, the effect of this additional carbonation on the reduction of the CO2 diffusion coefficient.
152 citations