The hygroscopic behavior of earthen materials has been extensively studied in the past decades. However, while the air flow within their porous network may significantly affect the kinetics of vapor transfer and thus their hygroscopic performances, few studies have focused on its assessment. For that purpose, a key parameter would be the gas permeability of the material, and its evolution with the relative humidity of the air. Indeed, due to the sorption properties of earthen material, an evolution of the water content, and thus of relative permeability, are foreseeable if the humidity of in-pore air changes. To fill this gap, this paper presents the measurement of relative permeabilities of a compacted earth sample with a new experimental set-up. The air flow through the sample is induced with an air generator at controlled flow rate, temperature, and humidity. The sample geometry was chosen in order to reduce, as much as possible, its heterogeneity in water content, and the tests were realized for several flow rates. The results, which show the evolution of gas permeability with the relative humidity of the injected air and with the water content of the material, either in adsorption or in desorption, were eventually successfully compared to predictions of the well-known Corey's law.
Accepté le :
Publié le :
@article{CRMECA_2019__347_12_912_0,
author = {Antonin Fabbri and Noha Al Haffar and Fionn McGregor},
title = {Measurement of the relative air permeability of compacted earth in the hygroscopic regime of saturation},
journal = {Comptes Rendus. M\'ecanique},
pages = {912--919},
publisher = {Elsevier},
volume = {347},
number = {12},
year = {2019},
doi = {10.1016/j.crme.2019.11.017},
language = {en},
}
TY - JOUR AU - Antonin Fabbri AU - Noha Al Haffar AU - Fionn McGregor TI - Measurement of the relative air permeability of compacted earth in the hygroscopic regime of saturation JO - Comptes Rendus. Mécanique PY - 2019 SP - 912 EP - 919 VL - 347 IS - 12 PB - Elsevier DO - 10.1016/j.crme.2019.11.017 LA - en ID - CRMECA_2019__347_12_912_0 ER -
%0 Journal Article %A Antonin Fabbri %A Noha Al Haffar %A Fionn McGregor %T Measurement of the relative air permeability of compacted earth in the hygroscopic regime of saturation %J Comptes Rendus. Mécanique %D 2019 %P 912-919 %V 347 %N 12 %I Elsevier %R 10.1016/j.crme.2019.11.017 %G en %F CRMECA_2019__347_12_912_0
Antonin Fabbri; Noha Al Haffar; Fionn McGregor. Measurement of the relative air permeability of compacted earth in the hygroscopic regime of saturation. Comptes Rendus. Mécanique, Volume 347 (2019) no. 12, pp. 912-919. doi : 10.1016/j.crme.2019.11.017. https://comptes-rendus.academie-sciences.fr/mecanique/articles/10.1016/j.crme.2019.11.017/
[1] Building houses with local materials: means to drastically reduce the environmental impact of construction, Build. Environ., Volume 36 (2011), pp. 1119-1126
[2] Life cycle analysis of environmental impact vs. durability of stabilised rammed earth, Constr. Build. Mater., Volume 142 (2017), pp. 128-136
[3] Analysis of the hygrothermal functional properties of stabilised rammed earth materials, Build. Environ., Volume 44 (2009), pp. 1935-1942
[4] The effect of combining a relative-humidity-sensituve ventilation system with the moisture buffering capacity of materials on indoor climate and energy efficiency of buildings, Build. Environ., Volume 44 (2009), pp. 515-524
[5] From the experimental characterisation of the hygrothermal properties of straw-clay mixtures to the numerical assessment of its buffering potential, Build. Environ., Volume 97 (2016), pp. 69-81
[6] Simultaneous hygrothermal performance assessment of an air volume and surrounding highly hygroscopic walls, Build. Environ., Volume 148 (2019), pp. 677-688
[7] Modern Earth Buildings, Woodhead, 2012
[8] The moisture buffering capacity of unfiered clay masonry, Build. Environ., Volume 82 (2014), pp. 599-607
[9] Effect of moisture content on the mechanical characteristics of rammed earth, Constr. Build. Mater., Volume 54 (2014), pp. 163-169
[10] Impact of hygrometry on mechanical behavior of compacted earth for building constructions, Constr. Build. Mater., Volume 110 (2016), pp. 70-78
[11] Loading-unloading shear behavior of rammed earth upon varying clay content and relative humidity conditions, Soil Found., Volume 58 (2018), pp. 1001-1015
[12] A microstructural insight into the hygro-mechanical behaviour of a stabilised hypercompacted earth, Mater. Struct., Volume 51 (2018), p. 32
[13] Assessing the performance of earth building materials: a review of recent developments, RILEM Tech. Lett., Volume 3 (2018), pp. 46-58
[14] Moisture balance assessment at room scale for four cases based on numerical simulations of heat–air–moisture transfers for a realistic occupancy scenario, J. Build. Performance Simulation, Volume 9 (2016), pp. 487-509
[15] A coupled hygrothermal model for earthen materials, Energy Build., Volume 116 (2016), pp. 498-511
[16] Procedure to determine the impact of the surface film resistance on the hygric properties of composite clay/fibre plasters, Mater. Struct., Volume 50 (2017)
[17] Effect of temperature on the sorption curves of earthen materials, Mater. Struct., Volume 50 (2017), p. 253
[18] Comparison of the saturated salt solution and the dynamic vapor sorption techniques based on the measured sorption isotherm of straw, Constr. Build. Mater., Volume 141 (2017), pp. 140-151
[19] Analysis of the water absorption test to assess the intrinsic permeability of earthen materials, Constr. Build. Mater., Volume 199 (2019), pp. 154-162
[20] Characterization and identification of equilibrium and transfer moisture properties for ordinary and high-performance cementitious materials, Cem. Concr. Res., Volume 29 (1999), pp. 1225-1238
[21] A test method to determine the relative humidity dependence of the air permeability of textile materials, J. Test. Eval. (1997)
[22] On the solution of coupled heat and moisture transport in porous material, Transp. Porous Media, Volume 121 (2018), pp. 665-702
[23] The interrelation between gas and oil relative permeability, Prod. Mon., Volume 19 (1954), pp. 38-41
[24] Temperature and damage impact on the permeability of opalinus clay, Rock Mech. Rock Eng., Volume 47 (2014), pp. 101-110
[25] Gas and stones permeability and pore structure of sandstones, Int. J. Rock Mech. Min. Sci., Volume 36 (1999), pp. 613-625
[26] Experimental investigation of the influence of supercritical state on the relative permeability of vosges sandstone, C. R., Méc., Volume 343 (2015), pp. 495-502
[27] A mutliscale network model for simulating moisture transfer properties of porous media, Transp. Porous Media, Volume 35 (1999), pp. 67-88
[28] The relative humidity dependence of the permeability of cement paste measured using nmr profiling, Cem. Concr. Res., Volume 57 (2014), pp. 88-94
[29] Modeling convection/diffusion processes in porous textiles with inclusion of humidity-dependent air permeability, Int. Commun. Heat Mass Transf., Volume 24 (1997), pp. 709-724
[30] The permeability of porous media to liquids and gases, Drilling and Production Practice, 1941
[31] Dependence on injection temperature and on aquifer's petrophysical properties of the local stress applying on the pore wall of a crystallized pore in the context of co2 storage in deep saline aquifers, Eur. Phys. J. Appl. Phys., Volume 64 (2013)
[32] Effect of carbonation on the hydro-mechanical properties of portland cements, Cem. Concr. Res., Volume 39 (2009), pp. 1156-1163
[33] Humidity-dependent air permeability of textile materials, Tex. Res. J., Volume 69 (1999), pp. 311-317
[34] Poromechanics of compacted earth for building applications, Poromechanics 2017 - Proceedings of the 6th Biot Conference on Poromechanics, 2017
Cité par Sources :
Commentaires - Politique