Effects of the anisotropy of extruded earth bricks on their hygrothermal properties

Maillard, Pascal; Aubert, Jean‐Emmanuel

doi:10.1016/j.conbuildmat.2014.04.001

Cited by 56 publications

(46 citation statements)

References 12 publications

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“…In addition, despite the large amount of pores, their connectivity is scarce. This microstructure has been extensively reported in the literature for typical heavy clay products manufactured by extrusion [36], [46]. It is also noticeable that the pore size of the E2 sample is much smaller than that of the P2 sample, which confirms the observation shown above.…”

Section: Membrane Physical Characterizationsupporting

confidence: 78%

Comparison of extruded and pressed low cost ceramic supports for microfiltration membranes

Lorente-Ayza

Mestre

Menéndez

et al. 2015

Journal of the European Ceramic Society

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A comparison has been made between ceramic microfiltration membranes of the same composition obtained by pressing and by extrusion in terms of microstructure and properties.The extruded membranes displayed lower porosity and smaller pore size than pressed membranes. The higher the clay content in the starting composition, the clearer this tendency became. In contrast, the difference tended to disappear when starch was added to the initial composition. The mechanical strength values followed a decreasing exponential variation with porosity, which was influenced by the starting composition and the shaping method.Water permeability reflected the strong effect of the mean pore size. The membranes synthesised from the composition with the higher clay content showed the lowest permeability, while those obtained from the composition including starch showed the highest value. A model derived from the Hagen-Poiseuille equation enabled the tortuosity values to be calculated.

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Section: Membrane Physical Characterizationsupporting

confidence: 78%

Comparison of extruded and pressed low cost ceramic supports for microfiltration membranes

Lorente-Ayza

Mestre

Menéndez

et al. 2015

Journal of the European Ceramic Society

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“…The hygrothermal characteristics of earth bricks have been measured and their ability to quickly absorb a significant amount of water vapour highlighted [8]. Similar measurements have been carried out to assess the influence of the production process (namely extrusion) on the hygrothermal properties of earth bricks [9]. Strong anisotropy was observed for both thermal and hygric properties due to the orientation of the clay platelets.…”

Section: On the Use Of Earth Mixed With Bio-based Materials In Constrmentioning

confidence: 89%

From the experimental characterization of the hygrothermal properties of straw-clay mixtures to the numerical assessment of their buffering potential

Labat

Magniont

Oudhof³

et al. 2016

Building and Environment

110

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. From the experimental characterization of the hygrothermal properties of straw-clay mixtures to the numerical assessment of their buffering potential. Building and Environment, Elsevier, 2016, 97, pp.69 -81. 10.1016/j.buildenv.2015 1 From the experimental characterization of the hygrothermal properties of straw-clay mixtures to the numerical assessment of their buffering potential ABSTRACTThe development of innovative materials has to respond to both environmental and energy concerns. Bio-based materials are relevant because they are made from renewable raw materials and are carbon neutral. Similarly, unprocessed earth has a very low embodied energy. In this paper, the basic hygrothermal properties of straw-clay samples provided by two French companies were determined. Mixes with densities lower than 450 kg.m -3 would be suitable for use as self-insulating material in current construction. In addition, the material showed a high sorption capacity and very high water vapour permeability. The measurements were then implemented in a numerical model in order to simulate the hygric response of a small room. The straw-clay mixture was found to have a moisture buffering effect of the same magnitude as walls made of hemp concrete and largely higher than conventional walls. The influence of various indoor finishing materials was investigated through additional simulations.

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“…3C), the volume Vol thickness and mass density of the brick (r) were known, and the water mass contained in each thickness of wall was estimated according to equation (9). M water thickness ¼ Vol thickness Â q thickness Â r brick (9) The estimate of the water quantity contained in the wall for a given time was determined according to equation (9).…”

Section: Appendixmentioning

confidence: 99%

“…Fewer researchers were interested in extruded bricks because there is no standard to determine their mechanical and hygrothermal properties. However, this manufacturing technique has some significant advantages; for example, the extrusion process is very fast and permits large quantities of homogenous bricks (density, form and size) to be produced [6,9]. Geopolymers, developed in 1978 by Joseph Davidovits, are solid inorganic materials that are synthesized at ambient temperature and atmospheric pressure [10].…”

Section: Introductionmentioning

confidence: 99%

Experimental evaluation of hydric performances of masonry walls made of earth bricks, geopolymer and wooden frame

Fouchal

Gouny

Maillard³

et al. 2015

Building and Environment

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Effects of the anisotropy of extruded earth bricks on their hygrothermal properties

Cited by 56 publications

References 12 publications

Comparison of extruded and pressed low cost ceramic supports for microfiltration membranes

Comparison of extruded and pressed low cost ceramic supports for microfiltration membranes

From the experimental characterization of the hygrothermal properties of straw-clay mixtures to the numerical assessment of their buffering potential

Experimental evaluation of hydric performances of masonry walls made of earth bricks, geopolymer and wooden frame

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