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Harifidy Ranaivomanana

Harifidy Ranaivomanana
Institut de recherche en Génie Civil et Mécanique (GeM) · Civil Engineering

PhD

About

20
Publications
1,737
Reads
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297
Citations
Citations since 2016
14 Research Items
243 Citations
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20162017201820192020202120220204060
20162017201820192020202120220204060
Introduction
My research activities are focused on four aspects: 1) Characterization and modeling of reactive transport in porous media (permeability, diffusivity) 2) Durability of concrete structures in aggressive environments (carbonation, leaching, self-healing process) 3) Valorization of dredged sdiments in civil engineering applications 4) Soil treatment Keywords: Cementitious materials, durability, prorous media, transport properties, carbonation, soil treatment, dredged sediments, modeling

Publications

Publications (20)
Article
Dans le contexte du projet Fastcarb, cet état de l’art vise à apporter un éclairage sur les différents mécanismes physico-chimiques gouvernant le processus de carbonatation en température. Trois paramètres, tous impactés par l’augmentation de la température, sont abordés de manière découplée : les transferts et équilibres hydriques, le transport de...
Article
Full-text available
Soil–water retention curve (SRWC), also called soil moisture characteristic, is used for simulation models of soil water storage or soil aggregate stability. The present study addresses the modeling of SRWC with particular attention paid to hysteresis effects of water filling and draining the pores attributed to ink-bottle effects. For that purpose...
Article
The accelerated carbonation of recycled concrete aggregates (RA) has been suggested to improve their properties. Several physical and mechanical phenomena occur during the carbonation of adhered cement mortar, but their effects are scarcely distinguished and correlated. In this study cement paste and mortar specimens have been exposed to carbonatio...
Conference Paper
Accelerated carbonation of recycled aggregates (RCA) is considered to improve their properties. Several physicochemical and mechanical phenomena occur during the carbonation of a cement mortar. To study them, mortar samples are submitted to accelerated carbonation in order to follow the evolution of their shrinkage as a function of the carbonation...
Article
Asbestos-Free Fiber Cement waste (AFFC) was tested in this study as supplementary cementitious materials (SCM) in concrete formulations. The incorporation of AFFC leads to a drop in total porosity, compressive strength and Young modulus due to the creation of capillary voids. The optimum dosage of AFFC is 10%. Below this value, the created capillar...
Conference Paper
Full-text available
En septembre 2011, deux digues expérimentales ont été construites sur le site du CER de Rouen. L'une a été construite en utilisant un sol limoneux de classe GTR A1, la seconde est constituée du même limon traité à 2,5% de chaux vive. Le présent article fait état de la méthodologie déployée pour l'évaluation des caractéristiques des matériaux 7 ans...
Article
This study deals with the definition of an efficient combination of fly ash (FA) with lime or cement and with both, to improve the dredged sediment (DS) properties. At early age, filler and nucleation effects of FA lead to a refinement of the microstructure in addition to the macro porosity reduction induced by lime and cement. At long term, the mi...
Article
This paper addresses the problem of the experimental characterization of cement-treated compacted soils in terms of micro-structural, hydraulic, and mechanical properties. Tests were conducted on two different types of soil: silty sand and clay as fine soils, and gravelous sand and alterite as granular soils. Samples were mixed with 5% cement and c...
Article
h i g h l i g h t s Direct shear test and mineral elemental analyses are carried out on sediment mixture stabilized using cement, lime and fly ash. Chemical stabilization increases sample cohesion but affects friction angle significantly less. The ratios of Al and Si for sediment samples stabilized using both lime and cement are improved depending...
Article
Sediments valorization (recycling) has revealed limitations due to different restrains and practical difficulties. When it comes to different recovery methods, the possibility of valuing diverse types of sediments still needs to be defined. Using a statistical approach, the present study aims to quantitatively estimate the mechanical resistance of...
Article
Full-text available
This study deals with the problem of the experimental characterization of cement-treated compacted soils in terms of microstructural and hydraulic properties. Some tests are conducted on two different types of soil: silty sand and clay as fine soils and gravelous sand and alterite as granular soil. Some samples are mixed with 5% of cement and compa...
Article
Full-text available
We consider a model for reactive flows which describes the healing process induced by carbonation of a single crack in concrete structures. The aim of this paper is to study the complex interplay between advection-diffusion mechanisms in a crack-matrix system combined with different chemical reactions taking place (dissolution/precipitation). Carbo...
Article
The present paper deals with the proposition of an original analytical permeability model of compacted soils. The model involves the microstructure of the material through the porosity and the pore-size distribution obtained by mercury intrusion porosimetry (MIP), as well as the degree of compaction. Their effects on the morphological parameters of...
Article
Full-text available
This study investigates the fate of nitrate and organic acids at the bitumenconcrete-steel interface within a repository storage cell for long-lived, intermediatelevel, radioactive wastes. The interface was simulated by a multiphase system in which cementitious matrices (CEM V-paste specimens) were exposed to bitumen model leachates consisting of n...
Article
Relative permeabilities and water vapor diffusion reduction factor coefficients are essential data regarding the modeling of moisture transport and hence the prediction of structure lifetimes. The dependency of these parameters on the humidity history and the chemical evolutions of the material limits their experimental measurement since tests are...
Article
The healing of cracks plays an important role with regard to the air- and water-tightness of concrete structures and the durability of cement based materials in general. This paper aims at further characterization and better comprehension of the healing phenomenon induced by the precipitation of calcite in localized cracks. The experimental program...
Book
Full-text available
This study investigates the fate of nitrate and organic acids at the bitumenconcrete- steel interface within a repository storage cell for long-lived, intermediatelevel, radioactive wastes. The interface was simulated by a multiphase system in which cementitious matrices (CEM V-paste specimens) were exposed to bitumen model leachates consisting of...
Article
The aim of this work is to describe a method based on a simple representation of the pore size distribution, which is able to predict hysteresis phenomena encountered in water sorption–desorption isotherms, particularly for cementitious materials. The hysteresis effect due to network constrictivity is taken into account in order to extend models of...

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