Title The influence of freeze-thaw cycles on the unconfined compressive strength of fiber- reinforced clay
Author Ghazavi, M.; Roustaie, M.
Author Affil Ghazavi, M., K. N. Toosi University of Technology, Civil Engineering Department, Tehran, Iran
Source Cold Regions Science and Technology, 61(2-3), p.125-131, . Publisher: Elsevier, Amsterdam, Netherlands. ISSN: 0165- 232X
Publication Date May 2010
Notes In English. Based on Publisher- supplied data GeoRef Acc. No: 309573
Index Terms clay minerals; compaction; compressive properties; freezing; ice; mechanical properties; permeability; physical properties; cohesion; soil mechanics; soil strength; soils; soil compaction; soil temperature; steels; strains; strength; stresses; temperature; tests; thawing; thermodynamic properties; water; water temperature; unfrozen water content; compressive strength; cyclic processes; elastic constants; engineering properties; failures; fiber-reinforced clay; freeze-thaw cycles; friction angles; kaolinite; low temperature; polypropylene; reinforced materials; shear strength; sheet silicates; silicates; steel; strain; stress; testing; unconfined compressive strength; water content
Abstract Freeze-thaw cycling is a weathering process that frequently occurs in cold climates. In the freeze state, thermodynamic conditions at temperatures just below 0C result in the translocation of water and ice. Consequently, the engineering properties of soils such as permeability, water content, stress-strain behavior, failure strength, elastic modulus, cohesion, and friction angle may be changed. Former studies have been focused on changes in physical and mechanical properties of soil due to freeze-thaw cycles. In this paper, the effect of freeze-thaw cycles on the compressive strength of fiber- reinforced clay is investigated. For this purpose, kaolinite clay reinforced by steel and polypropylene fibers is compacted in a laboratory and exposed to a maximum of 10 closed-system freezing and thawing cycles. The unconfined compressive strength of reinforced and unreinforced specimens is then determined. The results of the study show that for the soil investigated, the increase in the number of freeze-thaw cycles results in the decrease of unconfined compressive strength of clay samples by 20-25%. Moreover, inclusion of fiber in clay samples increases the unconfined compressive strength of soil and decreases the frost heave. Furthermore, the results of the study indicate that fiber addition does not decrease the soil strength against freeze-thaw cycles. Moreover, the study shows that the addition of 3% polypropylene fibers results in the increase of unconfined compressive strength of the soil before and after applying freeze-thaw cycles by 60% to 160% and decrease of frost heave by 70%.
URL http://hdl.handle.net/10.1016/j.coldregions.2009.12.005
Publication Type journal article
Record ID 65006535