scholarly journals The Use of Sorption Balance for the Characterization of the Water Retention Curve of Cement-Based Materials

2016 ◽  
Vol 14 (7) ◽  
pp. 354-367 ◽  
Author(s):  
Stéphane Poyet ◽  
Karine Trentin ◽  
Etienne Amblard
Keyword(s):  
Water Retention ◽  
Water Retention Curve ◽  
Retention Curve ◽  
Cement Based Materials

scholarly journals CARACTERIZAÇÃO FÍSICO-HÍDRICA DE UM CONDICIONADOR DE SOLO E SEUS EFEITOS QUANDO MISTURADO A UM SUBSTRATO ORGÂNICO

Irriga ◽  
2004 ◽  
Vol 9 (2) ◽  
pp. 94-105 ◽  
Author(s):  
Eliezer Santurbano Gervásio ◽  
José Antônio Frizzone
Keyword(s):  
Hydraulic Conductivity ◽  
Laboratory Tests ◽  
Water Retention ◽  
Saline Solution ◽  
Organic Substrate ◽  
Water Retention Curve ◽  
Distilled Water ◽  
Retention Curve ◽  
Soil Conditioner

CARACTERIZAÇÃO FÍSICO-HÍDRICA DE UM CONDICIONADOR DE SOLO E SEUS EFEITOS QUANDO MISTURADO A UM SUBSTRATO ORGÂNICO  Eliezer Santurbano Gervásio1;  José Antônio Frizzone21Instituto Centro de Ensino Tecnológico, Unidade Descentralizada de Sobral, Sobral, CE, [email protected] de Engenharia Rural, Escola Superior de Agricultura “Luiz de Queiroz”, Universidade de São Paulo, Piracicaba, SP.  1 RESUMO              O propósito desse trabalho foi caracterizar as propriedades físico-hídricas de um condicionador de solo e verificar os seus efeitos quando misturado a um substrato orgânico. Foi utilizado o condicionador comercial TerraCottem®, o qual foi submetido a ensaios de absorção em água destilada, absorção em solução salina e reabsorção. Posteriormente, doses do condicionador (0; 2,5; 5; 7,5 e 10kg m-3) foram adicionadas a um substrato orgânico, o qual foi submetido a ensaios laboratoriais para a determinação da curva característica de retenção de água e condutividade hidráulica do substrato saturado. Os excelentes resultados obtidos em laboratório, principalmente em termos de absorção e reabsorção, não são os mesmos quando da utilização do condicionador misturado ao substrato, podendo inviabilizar a sua aplicação principalmente devido o seu elevado custo. Quando o objetivo é a retenção de água, a atividade dos polímeros hidroabsorventes fica reduzida quando adicionados ao substrato orgânico.  UNITERMOS: Condicionador, polímeros hidroabsorventes, substrato.  GERVÁSIO, E. S.; FRIZZONE, J. A. PHYSICO-HYDRIC CHARACTERIZATION OF A SOIL CONDITIONER AND ITS EFFECTS WHEN MIXED TO AN ORGANIC SUBSTRATE  2 ABSTRACT  The purpose of this work was to characterize the physico-hydric properties of a soil conditioner and verify its effects when mixed to an organic substrate. Commercial conditioner TerraCottem® was used, then submitted to absorption tests in distilled water, in saline solution and re-absorption. Afterwards, doses of the conditioner (0; 2.5; 5; 7.5 and 10kg m-3) were added to an organic substrate, which was submitted to laboratory tests to determine the characteristic water retention curve and hydraulic conductivity of the saturated substrate. The excellent results obtained in laboratory, mainly for absorption and re-absorption, are not the same ones when compared to the use of the conditioner mixed to an organic substrate, which might make its application impossible mainly due to its high cost. When the objective is water retention, the activity of hydro absorbent polymers is reduced if they are added to organic substrate.  KEYWORDS: Conditioner, hydro absorbent polymers, substrate

scholarly journals Analysis of the relationship between the water retention curve, particle size and pore size distribution in the characterization of a collapsible porous clay

Respuestas ◽  
2020 ◽  
Vol 25 (1) ◽  
pp. 33-43
Author(s):  
María Camila Olarte ◽  
Juan Carlos Ruge
Keyword(s):  
Particle Size ◽  
Pore Size Distribution ◽  
Pore Size ◽  
Size Distribution ◽  
Water Retention ◽  
Strong Relationship ◽  
Water Retention Curve ◽  
Retention Curve ◽  
Porous Soils

In highly porous soils with a susceptibility to collapse, there are points of volumetric variability, due to the present heterogeneity, regarding the diameters of the poral throat. The predominance of a pore size is closely related to certain values of the Water Retention Curve (WRC). However, to date, a possible correlation with particle size distribution (PaSD), obtained using modern, highly reliable gravitational sedimentation methods, has not been studied. The porous clay of lateritic origin under study, was characterized by means of index tests, to know its basic geotechnical behavior. Subsequently, it was analyzed by mercury intrusion porosimetry tests, to estimate the Pore Size Distribution (PSD); filter paper and pressure plate method to obtain the water retention curve; as well as the method of integral measurement of the pressure in the suspension (ISP), to obtain the fine grain size of the material. This article tries to present a proposal of relationship between these parameters, with the aim of improving the understanding in the characterization of this type of materials. The results showed that there is indeed a strong relationship between the particle size distributions, pore size distribution and the water retention curve. Mainly, this is reflected in the geometric places corresponding to the air value entries (AEV) of macropores and micropores. Which coincide with essential parameters of the behavior of the other curves (PaSD and PSD).

INFLUENCE OF SOIL MATRIX ON SOIL-WATER RETENTION CURVE AND HYDRAULIC CHARACTERISTICS

2017 ◽  
Vol 16 (4) ◽  
pp. 869-877
Author(s):  
Vasile Lucian Pavel ◽  
Florian Statescu ◽  
Dorin Cotiu.ca-Zauca ◽  
Gabriela Biali ◽  
Paula Cojocaru
Keyword(s):  
Soil Water ◽  
Water Retention ◽  
Water Retention Curve ◽  
Hydraulic Characteristics ◽  
Soil Water Retention Curve ◽  
Soil Water Retention ◽  
Soil Matrix ◽  
Retention Curve
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