What is the meaning of swell and shrink?
Shrink–swell is the volume change that occurs as a result of changes in the moisture content of clay-rich soils. Swelling pressures can cause heave, or lifting of structures, whilst shrinkage can cause settlement or subsidence, which may be differential.
What is shrinkage potential?
Shrink/swell potential is the relative change in volume to be expected with changes in moisture content, that is, the extent to which the soil shrinks as it dries out or swells when it gets wet. Extent of shrinking and swelling is influenced by the amount and kind of clay in the soil.
What is soil shrink-swell capacity?
The shrink–swell capacity of soils refers to the extent certain clay minerals will expand when wet and retract when dry. Soil with a high shrink–swell capacity is problematic and is known as shrink–swell soil, or expansive soil.
What causes shrink swell in soil?
Shrink swell soil is the movement caused by the amount of water in the soil. A lot of rain or a very dry season can change how your soil acts around your foundation. Soil shrinkage occurs when the water is removed from the ground. This can be caused by a drought, heatwave, or just an extended dry period.
What do you mean by shrinking?
(Entry 1 of 2) intransitive verb. 1 : to contract or curl up the body or part of it : huddle, cower. 2a : to contract to less extent or compass. b : to become smaller or more compacted.
What is a shrink swell test?
The shrink swell test is a simple test that is routinely employed in Australian geotechnical engineering practice to assess quantita- tively the expansive potential of undisturbed or remolded clay soils, and to guide design of footings on these soils.
What is called shrinkage?
Shrinkage is the loss of inventory that can be attributed to factors such as employee theft, shoplifting, administrative error, vendor fraud, damage, and cashier error. Shrinkage is the difference between recorded inventory on a company’s balance sheet and its actual inventory.
What is a high shrink swell index?
The shrink–swell index of clay refers to the extent certain clay minerals will expand when wet and retract when dry. Soil with a high shrink–swell capacity is problematic and is known as shrink–swell soil, or expansive soil.
Why is it called a shrink?
The word “shrink” comes from “head shrinkage,” which refers to the ancient practice of shrinking the head of a conquered enemy. Thus, “shrink” originated as a slang term that people used to refer to mental health professionals.
What is the shrinkage index?
The shrinkage index is the numerical difference between the plastic limit and shrinkage limit of the remolded soil .
What is shrink reduction?
In the retail world, shrinkage, or shrink, is the term used to describe a reduction in inventory due to shoplifting; employee theft; administrative errors such as record keeping, pricing, and cash counting; and supplier fraud.
What is shrink/swell potential in construction?
One of these properties, shrink/swell potential, is of great importance in the construction industry. Shrink/swell potential is the relative change in volume to be expected with changes in moisture content, that is, the extent to which the soil shrinks as it dries out or swells when it gets wet.
What is shrink swell soil?
Soil with a high shrink–swell capacity is problematic and is known as shrink–swell soil, or expansive soil. The amount of certain clay minerals that are present, such as montmorillonite and smectite, directly affects the shrink-swell capacity of soil.
Where can I find a map of shrink/swell potential?
Maps of shrink/swell potential have been created for two areas of the state, the Greater Phoenix and Tucson Areas of Arizona. Copies of published soil surveys can be obtained from the Natural Resources Conservation Service. Contact the NRCS Chandler Field Office at 480-988-1078 to request a copy.
What are the dangers of shrink-swell capacity?
Soils with shrink-swell capacity can cause engineering problems, or damage to existing structures. The swelling can cause structures to heave or lift, and the shrinking can uneven settling of sediment underneath foundations, potentially causing the structure to fail.