Please use this identifier to cite or link to this item:
Full metadata record
DC FieldValueLanguage
dc.contributor.authorSarsembayeva, A-
dc.contributor.authorCollins, PEF-
dc.identifier.citationCold Regions Science and Technology, 133: pp. 26 - 35, (2017)en_US
dc.description.abstractSeasonal processes in cold countries significantly affect the engineering characteristics of highway subsoil over time. Cyclical freeze-thaw leads to changes in thermal and moisture conditions. As a result, road bearing capacity can progressively change from the initial design. In this work, a modified laboratory method was developed, with cyclical freeze-thaw of soil samples and simultaneous supply of deionised water and a de-icing agent (sodium chloride) to the base. The benefits of the test procedure included slow freezing, simulating the conditions that can be experienced by highway soils in cold environments, extended soil column heights and a larger number of identical soil samples, which allowed experimental variability to be assessed. The method included the monitoring of moisture and chemical mass transfer in the soils. Samples supplied with deionised water experienced ice segregation in their upper parts, and significant heave. While soils supplied with NaCl solution behaved in a similar fashion during their first freeze-thaw cycle, the second cycle saw a reduction in the rate of migration of the freezing front within the soils and also less ice segregation and less heave due to increased salinity. Salt was preferentially transferred upwards in the soil columns as a result of the thermal gradient, including negative pressure associated with cryosuction, and osmotic pressure. The new method provides a more realistic laboratory approach to assessing potential freeze-thaw impacts, and the effects of de-icing agents on soils beneath roads, and in different settings.en_US
dc.description.sponsorshipWe are grateful to JSC Center for scholarship support through the International program “Bolashak”, and to the Civil Engineering Division of Brunel University London, with special thanks to Neil Macfadyen for technical support.en_US
dc.format.extent26 - 35 (10)-
dc.subjectHighway subsoilen_US
dc.subjectDe-icing chemicalsen_US
dc.subjectLaboratory testen_US
dc.subjectSandy clayen_US
dc.titleEvaluation of frost heave and moisture/chemical migration mechanisms in highway subsoil using a laboratory simulation methoden_US
Appears in Collections:Dept of Mechanical Aerospace and Civil Engineering Research Papers

Files in This Item:
File Description SizeFormat 
FullText.docxFile is embargoed until 22/04/2018.2.67 MBUnknownView/Open

Items in BURA are protected by copyright, with all rights reserved, unless otherwise indicated.