scholarly journals Determination of water retention characteristics of organic soils, using the indirect filter-paper method

2018 ◽  
Vol 2 ◽  
pp. 13-21
Author(s):  
Ryszard Oleszczuk ◽  
◽  
Ewelina Zając ◽  
Edyta Hewelke ◽  
Karolina Wawer ◽  
...  
Keyword(s):  
Filter Paper ◽  
Water Retention ◽  
Organic Soils ◽  
Filter Paper Method ◽  
Retention Characteristics ◽  
Paper Method

scholarly journals Filter Paper Method for the Determination of the Soil Water Retention Curve

2015 ◽  
Vol 39 (5) ◽  
pp. 1344-1352 ◽  
Author(s):  
Eurileny Lucas de Almeida ◽  
Adunias dos Santos Teixeira ◽  
Francisco Chagas da Silva Filho ◽  
Raimundo Nonato de Assis Júnior ◽  
Raimundo Alípio de Oliveira Leão
Keyword(s):  
Filter Paper ◽  
Water Retention ◽  
Water Retention Curve ◽  
Soil Water Retention Curve ◽  
Soil Water Retention ◽  
Matric Potential ◽  
Retention Curve ◽  
Filter Paper Method ◽  
Van Genuchten Model ◽  
Paper Method

ABSTRACT High cost and long time required to determine a retention curve by the conventional methods of the Richards Chamber and Haines Funnel limit its use; therefore, alternative methods to facilitate this routine are needed. The filter paper method to determine the soil water retention curve was evaluated and compared to the conventional method. Undisturbed samples were collected from five different soils. Using a Haines Funnel and Richards Chamber, moisture content was obtained for tensions of 2; 4; 6; 8; 10; 33; 100; 300; 700; and 1,500 kPa. In the filter paper test, the soil matric potential was obtained from the filter-paper calibration equation, and the moisture subsequently determined based on the gravimetric difference. The van Genuchten model was fitted to the observed data of soil matric potential versus moisture. Moisture values of the conventional and the filter paper methods, estimated by the van Genuchten model, were compared. The filter paper method, with R2 of 0.99, can be used to determine water retention curves of agricultural soils as an alternative to the conventional method.

The Water Retention Characteristics of an Unsaturated Compacted Loess Material

2016 ◽  
Vol 703 ◽  
pp. 396-399
Author(s):  
Zhi Hu ◽  
Zheng Lu ◽  
Hai Lin Yao
Keyword(s):  
Filter Paper ◽  
Water Retention ◽  
Water Retention Curve ◽  
Combined Method ◽  
Retention Curve ◽  
Osmotic Suction ◽  
Retention Characteristics ◽  
Paper Method ◽  
Compacted Loess ◽  
Natural Loess

The water retention curve of an unsaturated compacted loess material has been obtained by combining the filter paper method, the vapour equilibrium method and the axis translation method. It was indicated that the combined method is efficient to investigate the water retention characteristics of compacted loess materials. The results showed that the osmotic suction in the compacted loess varies slightly with the increasing water content. Higher matric suction occurs in the compacted loess compared with the natural loess at the same moisture.

scholarly journals Filter paper method to determine the water retention curves for mortar and cement samples

2016 ◽  
Vol 9 (4) ◽  
pp. 525-533 ◽  
Author(s):  
J. M. L. VILASBOAS ◽  
S. L. MACHADO ◽  
S. A. PINTO
Keyword(s):  
Filter Paper ◽  
Unsaturated Soils ◽  
Water Retention ◽  
Energy State ◽  
Construction Materials ◽  
Water Retention Curve ◽  
Adjustment Process ◽  
Retention Curve ◽  
Filter Paper Method ◽  
Paper Method

Abstract This study deals with the application of the filter paper method to determine water retention curves for mortar and concrete samples. A water retention curve exhibits the relationship between water content and energy state in interstitial water, normally expressed as a negative value when compare to normal conditions of temperature and pressure, being referred to as suction. Considering the water retention curve as a basic characterization tool for unsaturated soils, its usage in the engineering field concerning most of the construction materials remains as a pending task. However, stating that not only permeability, but also the water retention curve performs a significant role for water and soluble substances flow through a material's pores makes this observation essential for life-span estimation in cases like reinforced-concrete structures. This research paper offers results for water retention curves obtained in mortar and concrete samples. The experimental curves went through a fitting adjustment process using Van Genutchen's [1] model, showing consistency with the obtained results. Furthermore, the water/cement mix ratio does not indicate or suggest a direct influence for water retention curves.

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