LABORATORY EVALUATION OF THE UNCONFINED COMPRESSION STRENGTH OF POLYMERIC FIBER REINFORCED SOILS

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Kral, R. (2014). LABORATORY EVALUATION OF THE UNCONFINED COMPRESSION STRENGTH OF POLYMERIC FIBER REINFORCED SOILS. Unc Charlotte Electronic Theses And Dissertations.
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Abstract

Geosynthetic fiber reinforced soil can be used to remediate weak, near-surface soils. The purpose of this study was to determine the impact that the geofibers had on the unconfined compressive strength (UCS) of various soil types. To distinguish this work from previous studies, a larger diameter test mold was utilized to eliminate boundary effects, soils were reinforced with 12.7 mm (0.5 in) long polypropylene fibrillated fiber (PFF) inclusions, a wider range of fiber contents was tested, test specimens were carefully molded using select kaolin clay and Ottawa sand materials, and the controlled specimens were compared to the performance of four field soils. A total of 165 UCS tests were performed at both optimum moisture content (OMC) and Soaked soil conditions. In comparison to unreinforced test specimens, fiber reinforced test specimens clearly showed an increase in UCS ranging from 4% to 820% as the fiber content increased from 0.5% to 2% by mass. The data also displayed an optimum UCS, dependent upon the fine content in the soil and the percentage of fiber inclusions. As the fiber content increased, an increase in axial strain and ductility of the reinforced soil was observed due to the interaction between the soil particles and the PFFs, which also affected the failure mode of each test specimen. Specimens tested under soaked soil conditions displayed an increase in strength with increased reinforcement, but the magnitude was lower than the specimens tested at OMC conditions. The data acquired as part of this study correlated well with data presented in the literature.

Details
Author

Kral, Robert

Title

LABORATORY EVALUATION OF THE UNCONFINED COMPRESSION STRENGTH OF POLYMERIC FIBER REINFORCED SOILS

Physical Description

1 online resource (297 pages) : PDF

Date

2014

Degree Granting Institution

University of North Carolina at Charlotte

Abstract

Geosynthetic fiber reinforced soil can be used to remediate weak, near-surface soils. The purpose of this study was to determine the impact that the geofibers had on the unconfined compressive strength (UCS) of various soil types. To distinguish this work from previous studies, a larger diameter test mold was utilized to eliminate boundary effects, soils were reinforced with 12.7 mm (0.5 in) long polypropylene fibrillated fiber (PFF) inclusions, a wider range of fiber contents was tested, test specimens were carefully molded using select kaolin clay and Ottawa sand materials, and the controlled specimens were compared to the performance of four field soils. A total of 165 UCS tests were performed at both optimum moisture content (OMC) and Soaked soil conditions. In comparison to unreinforced test specimens, fiber reinforced test specimens clearly showed an increase in UCS ranging from 4% to 820% as the fiber content increased from 0.5% to 2% by mass. The data also displayed an optimum UCS, dependent upon the fine content in the soil and the percentage of fiber inclusions. As the fiber content increased, an increase in axial strain and ductility of the reinforced soil was observed due to the interaction between the soil particles and the PFFs, which also affected the failure mode of each test specimen. Specimens tested under soaked soil conditions displayed an increase in strength with increased reinforcement, but the magnitude was lower than the specimens tested at OMC conditions. The data acquired as part of this study correlated well with data presented in the literature.

Genre

masters theses

Subjects--Topics

Civil engineering
Soil science
Geotechnical engineering

Degree

M.S.

Keywords

Fibrillated Fibers
Kaolin
Ottawa
Reinforced Soils
Unconfined Compressive Strength

Subject Area

Civil Engineering

Advisor(s)

Warren, Kimberly

Committee Members

Ogunro, Vincent
Pando, Miguel

Degree Note

Thesis (M.S.)--University of North Carolina at Charlotte, 2014.

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Rights Holder Information

Copyright is held by the author unless otherwise indicated.

Identifier

Kral_uncc_0694N_10731

Permalink

http://hdl.handle.net/20.500.13093/etd:1479