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Impact Of Randomly Distributed Hay Fibers On Engineering Properties Of Clay Soil

Submitted2020-06-28
Last Update2020-06-28
TitleImpact Of Randomly Distributed Hay Fibers On Engineering Properties Of Clay Soil
Author(s)Author #1
Author title:
Name: Abdulrahman Aldaood
Org: Department of Civil Engineering, College of Engineering, University of Mosul, Mosul 41002, Iraq
Country:
Email: alzubydi.1979@uomosul.edu.iq

Author #2
Author title:
Name: Amina Khalil
Org: Department of Civil Engineering, College of Engineering, University of Mosul, Mosul 41002, Iraq
Country:
Email: amina.alshumam@uomosul.edu.iq

Author #3
Author title:
Name: Ibrahim Alkiki
Org: Department of Dams Engineering and Water Resources, College of Engineering, University of Mosul, Mosul 41002, Iraq
Country:
Email: i.alkiki@uomosul.edu.iq

Other Author(s)
Contact AuthorAuthor #1
Alt Email: alzubydi.1979@uomosul.edu.iq
Telephone:
KeywordsHay fiber, Clay soil, Compressive strength, Microstructure, Water retention behaviour, Soil reinforcement.
AbstractNatural fibers had been used as reinforcing elements since 3000 BC. Recently, reinforcing soil with natural fibers has become of key significance in investigations. Hay fiber has been selected for this study because of its tensile strength and bulk availability. Thus, it is anticipated that the strength of reinforced soil would increase and cracking of the soil would be minimal. To verify that, a series of experimental tests have been performed on natural and hay fiber-reinforced soil specimens. Four different percentages of hay fibers (0.25, 0.5, 1.0 and 1.5% by weight) were used in this study and various experimental test, including unconfined compression test, P-wave velocity test, free swell test, soil-water retention test and microstructural test, were conducted on natural and hay fiber-reinforced soil specimens. Results show that the strength behavior of soil specimens depends considerably on the hay fiber content. It is found that the unconfined compressive strength (UCS) increases as the hay fiber content increases up to 1.0%, then it decreases for higher hay percentage used in the current study. It is noticed that the interaction between hay fiber and soil compounds could control the mechanism of the reinforcement benefit. Consequently, the swelling potential decreases significantly as the hay percent increases. The water-holding capacity of soil specimens increases with hay content. Furthermore, the parameters of soil water retention curve (SWRC): volumetric water content and corresponding air entry value depend directly on the texture of the hay fiber. Microstructural test explains the variations in SWRC parameters. It is observed that these parameters are significantly affected by the change in the pore size distribution of hay fiber-reinforced soil specimens.
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