Enhancing Mechanical Properties of Low Plasticity Clay Soil Using Hemp Fibers: Effects of Fiber Content and Fiber Surface Coating
Iranian Journal of Science and Technology - Transactions of Civil Engineering, cilt.48, sa.2, ss.961-975, 2024 (SCI-Expanded, Scopus)
- Yayın Türü: Makale / Tam Makale
- Cilt numarası: 48 Sayı: 2
- Basım Tarihi: 2024
- Doi Numarası: 10.1007/s40996-023-01208-5
- Dergi Adı: Iranian Journal of Science and Technology - Transactions of Civil Engineering
- Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus, ABI/INFORM, Aerospace Database, Agricultural & Environmental Science Database, CAB Abstracts, INSPEC, Civil Engineering Abstracts
- Sayfa Sayıları: ss.961-975
- Anahtar Kelimeler: Coated hemp fiber, Energy absorption capacity, Hemp fiber, Shear strength, Soil reinforcement, Triaxial compression test
- Süleyman Demirel Üniversitesi Adresli: Evet
Özet
In this study, the effect of different fiber contents (0.05%, 0.10%, 0.15%, and 0.20%) on the mechanical properties of low plasticity clay soils reinforced with raw and coated was investigated. For this purpose, reinforced specimens were axially loaded under different confining pressures (50, 100, and 200 kPa) in the unconsolidated-undrained triaxial compression test. The test results show that the stress–strain behaviour of the unreinforced soil changes from strain-softening to strain-hardening by adding hemp fiber into the soil. In general, bulging failure occurred in all specimens. The highest deviator stress at failure, energy absorption capacity and internal friction angle values were obtained in the specimen using 0.10% by-weight hemp fiber. The fibers are coated with three different water-repellent materials to protect the raw hemp fibers against biodegradation. The water absorption capacity of raw hemp fiber, measured as 218%, decreased by 127%, 213% and 159%, respectively, after coating Acrylonitrile Butadiene Styrene, epoxy, and Crystal PIB 907. Fiber’s diameters, friction surface areas, and surface roughness increased by coating raw hemp fibers. Consequently, it is found that specimens containing 0.10% by weight-coated hemp fiber had higher deviator stress, internal friction angle, and energy absorption capacity values than those containing raw hemp fiber.