Une méthode mécanique pour déterminer la porosité totale d'un sol

Abstract

International audienceThis paper presents a mechanical method for the determination of the total porosity of soil. The presented method consists to place a sample of soil in a cell which can be regulated by varying the volume of the gas by increments using a piston. The porosity of the soil is deduced by the variation of the total pressure of the gaseous phase during the realization of volume increments. The method has been validated on a soil considering 5 samples of different porosities. The experimental results on the total porosity are in good agreement with the theoretical results on all experimental tests.Cette note présente une méthode mécanique pour la détermination de la porosité totale d'un sol. La méthode présentée consiste à placer un échantillon de sol dans une cellule régulée dont on peut faire varier le volume par paliers grâce à un piston. La porosité du sol se déduit de la variation de la pression totale de la phase gazeuse lors des incréments de volume. La méthode a été validée sur un sol en considérant 5 échantillons de porosités différentes. Les résultats expérimentaux sur la porosité totale sont en bon accord avec les résultats théoriques sur l'ensemble des essais réalisés

Highlighting of a local non-equilibrium thermodynamics during the transfer of trichlorethylene (TCE) in the superficial layers of arid soils

“…It was initially developed to measure water activity and has been called "activity-meter". This device and the associated method were validated in our previous works (Ouoba et al, 2014b;Ouoba et al, 2010a) and have been patented in Europe and United States (Bénet et al, 2012) The sample (a) is placed against a pressure transducer (b) (Druck, PMP4030AB) and a temperature thermocouple (c) (type K). This records the total pressure of the gas, P g , and its temperature, T, throughout the test.…”

Microtomografia computadorizada de raios-X na caracterização morfométrica dos poros de Neossolo Regolítico Eutrofico

“…Os poros são espaços vazios responsáveis pelos processos de aeração, condução e retenção de água e nutrientes fundamentais para o desenvolvimento e crescimento de plantas e microorganismos. Esta característica está fortemente relacionada à fertilidade, estabilidade estrutural e à qualidade física do solo (Tormena et al, 1998, De Freitas et al, 2012Stefanoski et al, 2013;Pires et al, 2014, Ouoba et al, 2014. Portanto, estudos do espaço poral de um solo vêm sendo importantes tanto para caracterização do solo, como para avaliação estrutural e da qualidade física (Lu et al, 2014).…”