Effect of fines content on frost heave

1996 ◽  
Vol 33 (4) ◽  
pp. 678-680 ◽  
Author(s):  
Robert E Tester ◽  
Paul N Gaskin
Keyword(s):  
Key Words ◽  
Frost Heave ◽  
Cold Regions ◽  
Fines Content ◽  
Frost Action ◽  
Road Base ◽  
Pavement Structures ◽  
Freezing Test ◽  
Crushed Limestone ◽  
The U.S

In regions of seasonal frost the integrity of pavement structures is dependent on the resistance of base and subbase soils to frost action. This note describes the results of performing the U.S. Army Cold Regions Research and Engineering Laboratory CRREL II laboratory freezing test on a crushed limestone with a varying fines content. Frost heave increased linearly as fines content increased. Under the CRREL frost susceptibility criterion, the crushed gravel was satisfactory with up to 8% fines. A greater fines content resulted in an unsatisfactory classification. Key words: frost susceptibility, fines content, road base.

Field observations of frost action in intact and weathered Champlain Sea clay

1995 ◽  
Vol 32 (4) ◽  
pp. 689-700 ◽  
Author(s):  
J.-M. Konrad ◽  
M. Roy ◽  
P. La Rochelle ◽  
S. Leroueil ◽  
G. Bergeron
Keyword(s):  
Key Words ◽  
Frost Heave ◽  
Field Observations ◽  
Freeze Thaw ◽  
Frost Action ◽  
Intact State ◽  
Potential Value ◽  
Field Instrumentation ◽  
Segregation Potential ◽  
Undrained Strength

This paper presents the results of a field study on frost action in sensitive Saint–Alban clay both in an intact state, never subjected to any freeze–thaw cycles, and in its weathered state, corresponding to thousands of freeze–thaw cycles. It appears that intact clay is highly frost susceptible and displays frost heave of about 20 cm for the 1989–1990 freezing season. The segregation potential of intact clay ranges between 425 and 550 × 10−5 mm2/(s∙ °C), while that of the crust is only about 40 to 50 × 10−5 mm2/(s∙ °C). In the field, destructured clay displayed a segregation potential value of 265 × 10−5 mm2/(s∙ °C). Loss of bearing capacity during thaw of frozen intact clay is substantial, with reduction in undrained strength from 10 to 2.5 kPa. Key words : sensitive clays, frost heave, field, instrumentation, segregation potential.

Subsoil investigation of ice lensing at the Calgary, Canada, frost heave test facility

1988 ◽  
Vol 25 (2) ◽  
pp. 307-319 ◽  
Author(s):  
L. E. Carlson ◽  
J. F. (Derick) Nixon
Keyword(s):  
Key Words ◽  
Potential Model ◽  
Frost Heave ◽  
Test Facility ◽  
Field Observations ◽  
Silty Soil ◽  
Temperature Environment ◽  
Segregation Potential ◽  
Control Section

Several frost heave mitigation modes were studied at the Calgary, Canada, chilled pipeline frost heave test facility. These included deeper burial (to increase the pressure on the frost front below the pipe) and replacement of the silty soil around the pipe with gravel for a noninsulated pipe. Frost heave at the deep-burial section and at the gravel section was less than the heave at a control section. Other pipe sections tested the effects of insulation of the pipe on the long-term frost heave, as well as the effects of replacing the silt around an insulated pipe with gravel. Summer thawing of the frost bulb around the insulated pipe results in seasonal thaw settlement of the pipe, thus reducing the long-term pipe heave, at least for the warmer ground temperature environment at the Calgary facility.Thermal simulations of the frost bulb growth and predictions of frost heave using the segregation potential model agree well with the observations.Recent excavation of two frost bulbs in silty soil led to field observations of the interior of the frost bulbs, and subsequent laboratory analysis of frost bulb samples. Ice distribution was logged and photographed following excavation of each frost bulb. Key words: frost heave, pipeline, silt, mitigation, instrumentation, field observations.

Thaw weakening of pavement structures in cold regions

1999 ◽  
Vol 29 (2) ◽  
pp. 135-151 ◽  
Author(s):  
Erik Simonsen ◽  
Ulf Isacsson
Keyword(s):  
Cold Regions ◽  
Pavement Structures

Durabilité au gel-dégel et résistance à l'écaillage des pavés de béton

1992 ◽  
Vol 19 (6) ◽  
pp. 1017-1024 ◽  
Author(s):  
Jean Boisvert ◽  
Jacques Marchand ◽  
Michel Pigeon ◽  
Henri L. Isabelle
Keyword(s):  
Key Words ◽  
Saline Solution ◽  
Optical Microscope ◽  
Positive Influence ◽  
Good Resistance ◽  
Spacing Factor ◽  
Deicing Salts ◽  
Freezing Test ◽  
Air Void ◽  
Scaling Resistance

Tests results described in this paper show that it is quite easy to produce concrete paving blocks with excellent resistance to freezing–thawing cycles in water. Good resistance to frost-associated scaling in the presence of deicing salts is, however, much more difficult to obtain; and the problem is particularly difficult to analyse because two types of tests gave very different results. A freezing test in the presence of a saline solution (ASTM C672) showed positive influence of certain parameters (such as finer material), but freezing tests in a brine bath (ACNOR CAN3 A231.2 M85) did not show influence of any variable. In addition, the high number of compacting voids made it very difficult to interpret measurements of air-void characteristics made by examining ground sections under an optical microscope (ASTM C457). Key words: concrete paving blocks, scaling resistance, deicing salts, freezing–thawing cycles, air-void spacing factor. [Journal translation]

scholarly journals Ice lensing in layered soils

1986 ◽  
Vol 23 (3) ◽  
pp. 334-340 ◽  
Author(s):  
Edward Penner
Keyword(s):  
Key Words ◽  
Clay Layer ◽  
Layered Soils ◽  
Frost Heaving ◽  
Frost Action ◽  
Ice Growth ◽  
The Face ◽  
Moisture Conditions ◽  
Silt Layer

The ice lensing phenomenon in layered soils, a condition that simulates the process of ice growth in varved soils, has been studied experimentally. Under the limited conditions of layer thicknesses, soils used, freezing rates, and moisture conditions, ice lenses formed at the face of the fine-textured (clay) layer when it was encountered by the freezing plane. Only minor heaving occurred in the coarse-textured (silt) layer when its thickness was increased. Key words: frost action, ice lensing, frost heaving, varved soils, layered soils.

Adfreezing of insulated residential basements: an hypothesis

1987 ◽  
Vol 14 (5) ◽  
pp. 708-710
Author(s):  
K. D. Pressnail ◽  
J. Timusk
Keyword(s):  
Soil Moisture ◽  
Bond Strength ◽  
Key Words ◽  
Thermal Insulation ◽  
Frost Heave ◽  
Thermal Gradients ◽  
Moisture Movement ◽  
Foundation Wall

Concern has been expressed that recent increases in thermal insulation levels of residential basements in areas of seasonal frost may increase the risk of damage to foundations due to frost heave and adfreezing of the soil to the foundation wall. An hypothesis is presented which states that the adfreezing bond strength is affected by the direction of soil moisture movement in response to thermal gradients. This hypothesis may be used to explain why there have been no reported adfreezing problems associated with heated, insulated residential basements. Key words: adfreezing, basement, frost heave, insulation, moisture.

Sign in / Sign up

Export Citation Format

Share Document