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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


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.


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.


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.


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.

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