Center Technique Of Materiaux Naturels Of Construction Ctmnc

Limoges, France

Center Technique Of Materiaux Naturels Of Construction Ctmnc

Limoges, France
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Aubert J.E.,CNRS Materials and Construction Durability Laboratory | Maillard P.,Center Technique Of Materiaux Naturels Of Construction Ctmnc | Morel J.C.,CNRS Tribology and Dynamic Systems Laboratory | Morel J.C.,National School of Public Works | Al Rafii M.,CNRS Materials and Construction Durability Laboratory
Materials and Structures/Materiaux et Constructions | Year: 2015

There is an increasing demand for earth construction in the world today but there is no consensus on the procedure to be used to measure the compressive strength of earth bricks. The study presented in this paper aims to propose a test procedure specific to earth bricks that would give the most realistic value of compressive strength while remaining as simple as possible. This study focused on four different bricks and consisted of measuring the compressive strength of these specimens by varying several parameters: specimen size, orientation, use of Teflon capping or not, and tests on dry sawn specimens, on half-bricks or on entire bricks. The results of the study show that the best compromise to achieve a simple and representative compressive strength test for earth bricks is to transform the bricks as little as possible before the test and thus to test entire bricks. © 2015 RILEM


Aubert J.E.,INSA Toulouse | Fabbri A.,CNRS Tribology and Dynamic Systems Laboratory | Morel J.C.,CNRS Tribology and Dynamic Systems Laboratory | Maillard P.,Center Technique Of Materiaux Naturels Of Construction Ctmnc
Construction and Building Materials | Year: 2013

This paper presents the results of a compressive strength test carried out on an extruded earth block of dimensions 40.7 × 13.6 × 4.8 (cm 3). The failure of the block was not detected by the press used, which reached its highest load (2500 kN). This would correspond to a compressive strength of the block greater than 45 MPa! This value is obviously an aberration and the discussion developed in the paper, based on results from the literature, aims to explain this result and propose solutions for measuring the compressive strength of such products. © 2013 Elsevier Ltd. All rights reserved.


Gouny F.,CNRS Heterogeneous Materials Study Group | Gouny F.,Center Technique Of Materiaux Naturels Of Construction Ctmnc | Fouchal F.,University of Limoges | Pop O.,University of Limoges | And 2 more authors.
Construction and Building Materials | Year: 2013

Timber frame construction with earth brick infill is a sustainable design that is promising in the building construction field. However, cracks form at the interfaces of the bricks and frame with temperature and humidity fluctuations. A geopolymer binder can create stronger bonds between these two materials than traditional mortar, potentially preventing crack formation. This study focuses on the pull-out and shear mechanical behavior of laboratory assemblies of wood, geomaterial binder and two different types of earth brick. The full-field displacements of double-shear test samples were also obtained by digital image correlation (DIC) to better describe and understand the mechanical behavior of the system. The results show that the geopolymer binder provides good adhesion of approximately 1.5 MPa or 2 MPa, depending on the type of brick. Failure localization is also different for each assembly, occurring inside the brick and binder or only inside the binder. This result is confirmed by DIC analysis. The microstructure of the brick has been correlated with the mechanical behavior of the assembly. First results show that the geopolymer binder can be used as a joint in wood and earth masonry. © 2012 Elsevier Ltd. All rights reserved.


Fouchal F.,CNRS Heterogeneous Materials Study Group | Gouny F.,Limoges National Superior School of Industrial Ceramics | Gouny F.,Center Technique Of Materiaux Naturels Of Construction Ctmnc | Maillard P.,Center Technique Of Materiaux Naturels Of Construction Ctmnc | And 2 more authors.
Building and Environment | Year: 2015

This paper focuses on the characterization of the hydric properties of a new construction system in masonry structures composed of extruded earth bricks, geopolymer binder and wooden frame. The study was based on experimental tests such as the sorption desorption isotherms, the water vapor permeability tests on the different materials and the hydric test on a real size wall. The obtained results show the good properties of several materials, particularly in the storage of humidity. The different solicitations applied on the wall allowed to appreciate the ability of a earth brick wall to regulate humidity inside a house. © 2015 Elsevier Ltd.


Malfilatre C.,French National Center for Scientific Research | Boulvais P.,French National Center for Scientific Research | Dabard M.-P.,French National Center for Scientific Research | Bourquin S.,French National Center for Scientific Research | And 3 more authors.
Comptes Rendus - Geoscience | Year: 2012

The Comblanchien limestone is a well-known building stone that deserves a quantitative characterization in order to be able to certify its origin. We compare petrographical and geochemical characteristics of limestones commercialized under the name of Comblanchien to those of one of their competitors (VATC, a Portuguese coated grain-bearing limestone). From macroscopic and microscopic observations, the distinction is somehow difficult but the coated grain-bearing Comblanchien samples have δ 13C values (from +1.75 to +2.25‰) different from those of the VATC sample (negative δ 13C value). As an example of application of these results, three samples from a building site near Paris are also studied in order to verify their provenance. We conclude that they do not come from quarries from the Comblanchien area, but likely from Portugal. The study shows that a detailed analysis of building limestones may provide a robust tool for discriminating between currently mined stones of different provenances, and thus open the possibility to attach to a given limestone a fingerprint, an identity card, and if required a commercial label. © 2011 Académie des sciences.


Gouny F.,CNRS Heterogeneous Materials Study Group | Gouny F.,Center Technique Of Materiaux Naturels Of Construction Ctmnc | Fouchal F.,CNRS Heterogeneous Materials Study Group | Maillard P.,Center Technique Of Materiaux Naturels Of Construction Ctmnc | Rossignol S.,CNRS Heterogeneous Materials Study Group
Construction and Building Materials | Year: 2012

In building construction, because of the hygroscopic nature of wood and earth brick and the low adhesion between these materials, cracks are formed at their interface when they are assembled. Geopolymer binder has been show to create strong bonds between wood and earth brick. Assemblies of wood and extruded earth brick with geopolymer binder were manufacture and tested. Double shear tests at two scales were carried out that provided evidence of good adhesion and information about the influence of the type of brick on shear behavior. The workability of the binder was improved by adding siliceous aggregates. The mortar obtained has an improved compressive strength, ranging from 3 to 8 MPa, depending on the aggregate size. FTIR measurements and thermal analysis were performed to determine the reaction mechanism. © 2012 Elsevier Ltd. All rights reserved.


Nguyen T.-D.,Center Technique Of Materiaux Naturels Of Construction Ctmnc | Nguyen T.-D.,Duy Tan University | Meftah F.,Cergy-Pontoise University
Fire Safety Journal | Year: 2012

Understanding the behavior of masonry structures when exposed to fire and predicting their fire-resistance is a major need that has been expressed by brick manufacturers. Whereas clay brick masonry is widely used because of its thermal and sound insulation performance; fire-resistance is certainly its weakness if improper design methods are used. These design methods require prior exhaustive experimental tests, which should not be limited to evaluating standard fire-resistance as a global standard criterion but should also permit a detailed analysis of the thermo-mechanical behavior of masonry walls. In this paper, four wall-tests are presented to illustrate the behavior of clay masonry walls during fire. Selected wall-tests are generically representative of the overall results obtained during a more extended experimental campaign. The experimental results are presented and analyzed with regard to the risk of spalling on the fire-resistance of masonry. The analysis contains a detailed investigation of temperature, deformation and local mechanical degradation phenomena in the tested walls. Finally, the study is concluded by summarizing end-point parameters that significantly control the fire-resistance of clay masonry walls and deserve consideration in any modeling approach. © 2012 Elsevier Ltd. All rights reserved.


Gouny F.,CNRS Heterogeneous Materials Study Group | Gouny F.,Center Technique Of Materiaux Naturels Of Construction Ctmnc | Fouchal F.,CNRS Heterogeneous Materials Study Group | Maillard P.,Center Technique Of Materiaux Naturels Of Construction Ctmnc | Rossignol S.,CNRS Heterogeneous Materials Study Group
Industrial and Engineering Chemistry Research | Year: 2014

In building construction, geopolymer binder or mortar can interact with the structural materials and thus modify the binder formation mechanisms. In a geopolymer binder, the availability and amount of siliceous species is a preponderant parameter influencing the nature of networks formed after consolidation. In this study, the interactions between the binder and structural materials (wood and earth bricks) were investigated by 29Si magic angle spinning nuclear magnetic resonance (MAS NMR) and Fourier transform infrared spectroscopy (FTIR) during and after the consolidation. Then, the effect of the amount and nature of the siliceous species available in the reaction medium were analyzed. According to the siliceous species available, it is possible to form different types of materials (hardening or sedimented materials). By corroborating these results with MAS NMR and FTIR analyses, a formation scheme of the binder in contact with the materials was proposed. © 2014 American Chemical Society.


Maillard P.,Center Technique Of Materiaux Naturels Of Construction Ctmnc | Aubert J.E.,CNRS Materials and Construction Durability Laboratory
Construction and Building Materials | Year: 2014

The study focuses on the thermal and hydric properties of extruded earth bricks. The thermal conductivity and water vapour permeability tests highlight anisotropic behaviour of the bricks depending on the extrusion direction during the production process. The results confirm that the extrusion process has a major influence on the orientation of clay layers and has an impact on the hygrothermal properties. © 2014 Elsevier Ltd. All rights reserved.

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