Lubricated compression and X-ray microtomography to analyse the rheology of a fibre-reinforced mortar

Chalencon, F.; Orgéas, Laurent; Dumont, Pierre; Foray, Geneviève; Cavaillé, J.Y.; Maire, Éric; Roscoat, Sabine Rolland Du

doi:10.1007/s00397-009-0393-5

Cited by 30 publications

(16 citation statements)

References 46 publications

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“…The material used for all tests is a commercial formulation (Lafarge, MAITE monocomposant) used for external thermal insulation composite systems [Chalencon et al, 2010]. It is a Portland cement mortar including dry redispersable polymer systems with a water to dry material weight ratio of 0.16 and reinforced with 1% weight of glass fibres.…”

Section: Methodsmentioning

confidence: 99%

“…The paste was then moulded into prismatic samples of 500 g and approximately 300×100×10 mm, and kept two days at a 90% relative humidity to prevent excessive water loss of the cement paste. The samples were then unmoulded and kept for 21 days of maturation at 50%RH: the mechanical behaviour of fibre-reinforced mortar resulting from this maturation procedure are known [Chalencon et al, 2010].…”

Section: Methodsmentioning

confidence: 99%

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Influence of Diffuse Damage on the Water Vapour Permeability of Fibre-Reinforced Mortar

et al. 2012

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The study of moisture transfer inside building materials is an important issue in building physics. The hygric characterization of such materials has become a common practice for the estimation of the hygrothermal performance of buildings. However, their aging caused by mechanical loading and environmental factors inevitably affects their permeability to moisture ingress, and the knowledge of how this permeability is affected by damage and cracks is still incomplete.The effects of diffuse damage caused by mechanical loading on the water vapour permeability of fibre-reinforced mortar were studied. A full experimental setup is presented including observation of the porous structure, mechanical, and hygric characterization. Uniaxial tensile loading was applied on prismatic samples while their damage level was measured. Then, the moisture content of damaged and undamaged samples was monitored during variations of ambient relative humidity. Two numerical methods are presented and used for the comparison of the water vapour permeability of multiple samples presenting various levels of damage. By this methodology, diffuse damage caused by mechanical loading is shown to have an impact on the water vapour transfer inside the material.

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Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Influence of Diffuse Damage on the Water Vapour Permeability of Fibre-Reinforced Mortar

et al. 2012

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“…As shown from this graph, whatever the investigated fibre content, the dimensionless stress σ * is more or less constant. An identical trend was also noticed during the flow of fibre reinforced mortars, which displayed a microstructure and a rheology rather close to the BMC one [13]. Hence, the strain-hardening observed in simple compression is mainly due to the pasty matrix, e.g.…”

Section: Resultsmentioning

confidence: 51%

“…7: * Graph (a) is built from the simple compression experiments performed in [41]. For this type of flow, the initial nearly planar random fibrous microstructure should not evolve drastically [13,21]. The graph represents the evolution of the normalised stress σ * as a function of the axial strain ε 33 The dimensionless axial stress σ * corresponds to the axial stress σ 33 recorded for those BMC's divided by the axial stress σ 33 recorded for the BMC without fibre (fibre content = 0 wt.%).…”

Section: Resultsmentioning

confidence: 99%

Towards the simulation of mould filling with polymer composites reinforced with mineral fillers and short fibres

et al. 2009

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Bulk Moulding Compounds (BMC's) are short fibre reinforced polymer composites that behave, during their forming, as concentrated fibre suspensions. Their suspending fluid is also a concentrated granular suspension made up of the polymer filled with mineral fillers. In this work, a method is proposed to model their flow. Firstly, the rheology of an industrial BMC was analysed by performing two types of mechanical tests, i.e. lubricated simple and plane strain compression experiments. Experimental results underline the roles of the current strain, the strain rate as well as the mechanical loading on the rheology of the BMC. Secondly, a 3D tensorial rheological model is proposed to reproduce the simple and plane strain compression experiments. Then this model is implemented into a Finite Element code dedicated to the simulation of The 'Pôle de Compétitivité Plastipolis' (Région Rhône-Alpes -France) supports this research. compression moulding. Simulation results are finally compared with experiments achieved with rather complex flow situations.

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“…This configuration includes an external insulation layer, protected from climatic conditions by a hygrophobic coating. A candidate for this purpose is a previously studied engineered cementitous composite including glass fibres and a dispersed polymer phase [6]. This material has a very low permeability to liquid water and vapour.…”

Section: Dynamic Behaviourmentioning

confidence: 99%

Influence of concrete fracture on the rain infiltration and thermal performance of building facades

Rouchier

Woloszyn

Foray

et al. 2013

International Journal of Heat and Mass Transfer

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Postprint: Rouchier S., Woloszyn M., Foray G., Roux J.-J., 2013. Influence of concrete fracture on the rain infiltration and thermal performance of building facades, International Journal of Heat and Mass Transfer vol. 61, pp. 340-352. DOI: 10.1016/j.ijheatmasstransfer.2013.02.013 Abstract Water infiltration is known to play an important part in the degradation process of construction materials. Over time, microscopic and macroscopic cracks progressively develop under the effects of mechanical loading and sorption/desorption cycles: their influence is to be accounted for in long-term hygrothermal performance assessments of the building envelope. The present work aims at showing the potential consequences of cracking on the heat and moisture transfer across building facades, in order to justify the need for the identification of damage to prevent durability and thermal issues. Specific simulation cases of insulated and non-insulated building facades were defined, and submitted to atmospheric boundary conditions for simulation times of one month. Some of the simulation geometries included previous measurements of crack patterns in concrete. The comparison of fractured and non-fractured building facades showed the effects of cracks on the moisture accumulation and thermal performance of these wall configurations, thus giving an estimate of what these effects might be in real conditions. A methodology is thus proposed for the identification of renovation needs, which may be applied for the purpose of durability assessments as well.

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Lubricated compression and X-ray microtomography to analyse the rheology of a fibre-reinforced mortar

Cited by 30 publications

References 46 publications

Influence of Diffuse Damage on the Water Vapour Permeability of Fibre-Reinforced Mortar

Influence of Diffuse Damage on the Water Vapour Permeability of Fibre-Reinforced Mortar

Towards the simulation of mould filling with polymer composites reinforced with mineral fillers and short fibres

Influence of concrete fracture on the rain infiltration and thermal performance of building facades

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