Capillary Water Barrier
As a geomaterial desaturates its hydraulic conductivity does not remain constant but instead drops significantly with decreasing degrees of saturation.
Capillary water barrier. It is capillary water barrier. 1 2 1 capillary water barrier a layer of clean poorly graded crushed rock stone or natural sand or gravel having a high porosity which is placed beneath a building slab with or without a vapor barrier to cut off the capillary flow of pore water to the area immediately below a slab. Install a vapor barrier over this consisting of. A capillary barrier will form and restrict water flow when two porous materials with differing porous structures e g a geotextile overlain by a fine grained soil are in contact with one another.
Cwb capillary water barrier. Looking for abbreviations of cwb. Water that remains in the soil after gravitational water is drained out that is subject to the laws of capillary movement and that is in the form of a film around the soil grains. Capillary action occurs because water is sticky thanks to the forces of cohesion water molecules like to stay close together and adhesion water molecules are attracted and stick to other substances.
1 2 2 degree of compaction. The surface tension acts to hold the surface intact. Key to the understanding of capillary barriers is the assessment of water flow and storage in porous geomaterials e g. Adhesion of water to the walls of a vessel will cause an upward force on the liquid at the edges and result in a meniscus which turns upward.
Definition of capillary water. Capillary water barrier shall consist of clean poorly graded crushed rock crushed gravel or uncrushed gravel placed beneath a building slab with or without a vapor barrier to cut off the capillary flow of pore water to the. Install a capillary break beneath slab foundations for example a slab on grade or basement slab foundation consisting of 4 inches of aggregate stone or 4 inches of sand covered by geotextile matting. Soils geosynthetics under unsaturated conditions.