
	Where results make sense

Topic: Frost heaving

Related Topics

Frost

Root

Spicule

The Velvet Underground

In the News (Sat 2 Jun 12)

EXECUTIVE POWER

Iran

ANALYSIS

Pakistan

Family compact

	Structure for preventing frost heave damage to an underground structure and a method of installing the same - Patent ...
		The maximum value of the frost depth as mentioned here refers to the value that may be produced within a certain period at the place of construction of the underground structure, and the maximum depth of the layer in which frost heave and thaw settlement of the soil are repeated.
		Frost heave is produced as ice lens grows while absorbing water from the unfrozen soil layer 3 in the negative temperature area in the immediate proximity of the freezing front 5.
		As a result, the frost heaving force F acting on the pile 10 from the frozen soil layer 4 is balanced, inside the pile 10, with the frost heaving reaction force F' acting on the protective grids 1 from the unfrozen soil layer 3 through the reaction member 7.
	www.freepatentsonline.com /6309142.html (3408 words)

	Frost Action and Frost Heave (Site not responding. Last check: 2007-10-13)
		Frost action is a phenomena that occurs in the winter and early springtime in Northern climates.
		For pavements, frost action becomes critical when either (1) the freezing phase is accompanied by noticeable heaving of the road surface, or (2) the thawing phase is accompanied by a noticeable softening of the roadbed.
		Frost heave spots should be drained with tile drains and/or ditches should be kept clean and free of clutter that prevents flow of water away from the pavement.
	www.pavement.com /Concrete_Pavement/Technical/Fundamentals/Frost.asp (669 words)

	frost - HighBeam Encyclopedia
		Frost often appears as a light feathery deposit of ice, often of a curious and delicate pattern.
		Frost heaving, an upthrust of ground caused by freezing, is a factor of consideration in engineering construction, especially in highway foundations.
		Frost is also a factor in the layer by layer mechanical weathering (exfoliation) of many types of rock masses.
	www.encyclopedia.com /doc/1E1-frost.html (480 words)

	CBD-26. Ground Freezing and Frost Heaving - NRC-IRC
		Frost damage to building foundations, retaining walls, driveways, walks and similar structures is common throughout Canada, and although it is not equally serious in all areas the resultant cost each year is high.
		At first, frost heaving of the soil was thought to result from the expansion of water on freezing.
		Frost heaving is not usually a problem in heated structures since the heat loss from the building keeps the temperature in the soil adjacent to the foundation above the freezing point.
	irc.nrc-cnrc.gc.ca /pubs/cbd/cbd026_e.html (2460 words)

	CBD-182. Frost Action and Foundations - NRC-IRC
		Heaving pressures developing at the base of the freezing zone are transmitted through the adfreezing bond to the foundation, producing uplift forces capable of appreciable vertical displacements.
		For frost action to occur three basic conditions must be satisfied: the soil must be frost-susceptible; water must be available in sufficient quantities; and cooling conditions must cause soil and water to freeze.
		Frost heaving and damage frequently occur on construction sites in early winter because temporary heating is not begun sufficiently early.
	irc.nrc-cnrc.gc.ca /pubs/cbd/cbd182_e.html (1986 words)

	Frost Heaving of Pilings, Alaska Science Forum (Site not responding. Last check: 2007-10-13)
		Frost heaving is greatest in wet, fine-grained soils--clays and silts--since they undergo the greatest expansion of their volume as they freeze.
		Upward frost heaving pressure on the bottom of a piling set in wet, fine-grained soil can easily be 60 pounds per square inch (4 kilograms per square centimeter).
		If conditions are favorable to continued heaving year after year--repeated freezing and thawing of the soil wherein the piling is set plus plenty of available ground water--the piling eventually will be lifted entirely out of the ground.
	www.gi.alaska.edu /ScienceForum/ASF2/279.html (419 words)

	Frost heaving - Wikipedia, the free encyclopedia
		In the 1960s, frost heaving was demonstrated in soil saturated in benzene and nitrobenzene, which contract when they freeze.
		In Arctic regions, frost heaving for hundreds of years can create structures, known as pingos, as high as 60 metres.
		Frost heaving is also responsible for creating stones in unique shapes such as circles, polygons and stripes.
	en.wikipedia.org /wiki/Frost_heaving (497 words)

	Measurement of frost depths (Site not responding. Last check: 2007-10-13)
		The objectives of this manuscript are to evaluate various methods for determining frost depth and to report results of tests to determine use and performance of a simple and inexpensive gage for determining frost depth.
		A typical plot layout, frost gage, and soil moisture block horizonal and vertical spacing for the 1983/84 season are shown in figure 2 and figure 3.
		The difference in frost depths between the standing stubble and bare soils is appreciable; maximum frost depth on the standing stubble was 180 mm whereas that on the bare soils was 330 mm.
	snow.ag.uidaho.edu /Publications/frost/frost.html (2718 words)

	Physics News Graphics: Frost Heaving (Site not responding. Last check: 2007-10-13)
		Learn about the process of frost heaving, a poorly understood phenomenon in which ice columns grow upward against the force of gravity.
		Frost heaving, a poorly understood process by which ice columns grow upward against the force of gravity, can be studied in the lab.
		These two heaving mountains (Split Pingo foreground, Ibyuk Pingo background, both roughly 50 m high) are located in the delta of the Mackenzie River in the Canadian Arctic.
	www.aip.org /png/html/frost.htm (116 words)

	How Aggregates Prevent Frost Heave
		Frost heave in soils and in improperly designed aggregate base layers can be a major destructive force in deteriorating pavements and structures.
		Frost heaving occurs when additional water can be drawn into the pores between soil and aggregate particles by capillary action.
		Frost heave can occur in soils and bases under concrete and asphalt pavements, under driveways, and under interior slabs on grade in unheated structures.
	rockproducts.com /mag/rock_aggregates_prevent_frost/index.html (727 words)

	PermaFrost
		In Russia, there was patented a new non traditional way to raise foundations of cottages and multistory buildings on frost heaving soils, that was introduced into practice in conditions of seasonal freezing of soils and also in a region with severe climate and permafrost.
		The traditional ways of constructing foundations on the frost heaving soils require placing footings below the frost line, which in spite of the high costs of zero cycle stage construction does not guarantee the reliability and durability of foundations.
		We can help you evaluate the degree of heaving and frost resistance of soils and pick up the most rational type and construction of the foundation for your cottages.
	members.tripod.com /~olgagolli/index.html (334 words)

	Frost injury - pest guide
		Frost heaving is almost exclusively restricted to first-year seedlings in cold, poorly drained soils.
		Winter frost may cause stem and trunk damage in the form of cankers cracks, and scabby (discoloured and scaly) bark.
		Frost heaving is also caused by late spring frosts, and can result in significant seedling mortality on newly planted sites at higher elevations.
	www.for.gov.bc.ca /HFP/publications/00198/frost.htm (804 words)

	Prevent Frost Heaving
		Frost heaving occurs when garden soil expands and contracts through the process of freezing and thawing.
		Frost heaving is evident in the photo below (note the cracked soil surface in the foreground).
		If heaving is evident in your garden simply press the soil back in place and cover the area with a thick layer of leaves (see below) or other mulching material.
	www.savvygardener.com /Features/frost_heaving.html (196 words)

	Frost-Protected Shallow Foundations: How Frost Heave Works - The Concrete Network
		Where restraint in the form of a building load is present, heaving pressures may or may not overcome the restraint, but they can be very high: 19 tons/sq ft has been measured, and a seven-story reinforced concrete frame building on a raft foundation was observed to heave more than 2 in.
		A different form of frost action, called "adfreezing," occurs when soil freezes to the surface of a foundation.
		Depths at which foundations should be placed are normally determined by local experience, as incorporated in building bylaws, but in the absence of such information the correlation shown in the preceding chart can be used.
	www.concretenetwork.com /concrete/frost_protected_shallow_footings/frost_actions_and_foundations.htm (753 words)

	News Release (Site not responding. Last check: 2007-10-13)
		Heaving may break off roots and expose a plant’s crown and remaining roots to cold temperatures and drying winds that may seriously damage or destroy perennials.
		Frost heaving often occurs when an area experiences frequent periods of above and below freezing temperatures.
		To prevent frost heaving from damaging plants at this time of year, inspect your garden perennials and take corrective actions.
	www.extension.iastate.edu /news/2006/mar/070202.htm (500 words)

	Frost-Protected Shallow Foundations (FPSF)
		Insulation around the perimeter of the foundation reduces the amount of heat loss from the warm interior to the cold exterior in the winter, which would normally pass through the slab or floor, and out through the foundation.
		The foundation is wrapped with polystyrene foam that provides a thermal barrier and channels the escaping heat to warm the earth beneath the foundation.
		Frost protected shallow foundations are simpler to install than traditional foundations.
	www.toolbase.org /Technology-Inventory/Foundations/frost-protected-shallow-foundations (1083 words)

	Cereals: Other Problems
		The freeze/thaw cycles of early spring are one of the main reasons for winterkill in Ontario.
		Frost heaving of winter wheat is caused by freeze/thaw cycles of early spring lifting the crown up.
		To maximize resistance to frost heaving, wheat plants need an extensive secondary root system developed as deep as possible.
	www.omafra.gov.on.ca /english/crops/pub811/6other.htm (856 words)

	Ag Answers: Frost Heaving Severely Damages Ohio Alfalfa
		Severe cases of frost heaving have damaged many Ohio alfalfa fields and in some cases, completely destroyed plant stands, says an Ohio State forage agronomist.
		Frost heaving appeared to be a winter-long process, followed with multiple freeze-thaw cycles of warm days and cold nights into the spring, Sulc says.
		Sulc even saw damage in tiled fields, although silty, poorly drained soils are most susceptible to frost heaving.
	www.agriculture.purdue.edu /AgAnswers/story.asp?storyID=542 (346 words)

	Frost - Wikipedia, the free encyclopedia
		It is also affected by differences in absorptivity and specific heat of the ground which in the absence of wind greatly influences the temperature attained by the superincumbent air.
		Because cold air is more dense than warm air, and forms close to the ground, in calm weather cold air pools at ground level.
		Hoar frost does not occur exclusively in nature.
	en.wikipedia.org /wiki/Frost (761 words)

	Physics News Update Number 334 - FROST HEAVING (Site not responding. Last check: 2007-10-13)
		Ozawa believes that newly formed ice is able to push against gravity not through any conventional mechanical force but by a thermodynamic tendency by which the system as a whole (water plus ice) gains entropy.
		In principle, one could build a "frost engine" which could produce a heaving pressure of a megapascal per degree of supercooling.
		Similarly one might make a "helium frost engine" operating near 0 K and a "metal frost engine" operating at blast-furnace temperatures.
	www.aip.org /pnu/1997/split/pnu334-2.htm (220 words)

	GardenWeb Glossary of Botanical Terms
		A frost where both the air and the soil has dropped below freezing.
		Many plants can survive a light frost but cannot survive a hard frost.
		Alternate freezing and thawing of soil causing a plant to be pushed upward and often exposing its roots to damage.
	glossary.gardenweb.com /glossary/nph-ind.cgi?scrug=16677&k=frost&b=and&r=whole&s=terms (315 words)

	Frost heaving? - Alpines & Rock Gardens Forum - GardenWeb
		I don't have that problem here, so I haven't tried this, but I've read in an article in a NARGS quarterly that planting with a collar of regular soil around the plant will prevent frost heave in sand/gravel conditions.
		I'm wondering why I'm having this frost-heaving problem at all - what happens to alpines in alpine conditions - how would they survive if they heave, or don't they.
		More to the point, what if anything should I do for the edelweiss this fall to prevent damage to their roots.
	forums.gardenweb.com /forums/load/alpines/msg0410222132294.html (278 words)

	Frost Protected Shallow Foundations
		Building Codes require extending foundations below the frost line to prevent frost-heaving of the foundations.
		This requires a lot of excavation and concrete, which can be very costly and time-consuming.
		Building & Construction Home : North America Home : Canadian Residential : Project Information : Frost Protected Shallow Foundations
	www.dow.com /styrofoam/na/res-canada/projects/frost_protected_found.htm (150 words)

Try your search on: Qwika (all wikis)