The Triaxial Test of Polypropylene Fiber Reinforced Fly Ash Soil

Abstract

Recently, soil reinforcement using arranged or randomly distributed fibers has attracted increasing attention in geotechnical engineering. In this study, polypropylene (PP) fibers with three lengths (6, 12, and 24 mm) and three mass percentages (0.5%, 1%, and 1.5%) were used to reinforce a coal fly ash soil (FAS) mixture. Unconsolidated, undrained triaxial tests were carried out in order to study the mechanical properties of the polypropylene fiber-reinforced FAS mixture and evaluate the impact of fiber on the shear strength of the FAS mixture. It is found that the fiber length of 12 mm could significantly improve the shear strength of the polypropylene fiber reinforced FAS mixture, and little effect is shown on the shear strength while using a fiber length of 24 mm. Additional fibers enhance the energy absorption capacity of the FAS specimens and therefore the highest energy absorption capacity occurs when the fiber content is 1% and the fiber length is 12 mm. The peak deviator stress enhances impressively with the addition of polypropylene fiber. The impact of fiber on the peak deviator stress is the largest when fiber content is within 1.0%. The fiber length has little effect on the peak deviator stress when it exceeds 12 mm.

Current State of Coal Fly Ash Utilization: Characterization and Application

“…Li et al [9] provided an article entitled "The Triaxial Test of Polypropylene Fiber Reinforced Fly Ash Soil". Recently, soil reinforcement using arranged or randomly distributed fibers has attracted increasing attention in geotechnical engineering.…”

Analysis of basalt fiber reinforcement on static shear properties of Beibu Gulf sea sand

“…At present, most researchers at home and abroad have studied the influence of fiber reinforcement on the mechanical properties of sand by conducting triaxial compression tests [24][25][26][27][28], direct shear tests [29][30][31], and unconfined compressive strength tests [32][33][34][35] and have achieved interesting research results. The most commonly used fiber materials include polypropylene fibers [36][37][38][39], carbon fibers [40][41], and glass fibers [42][43][44][45]. Experiments indicated that increasing the length of the polypropylene fiber leads to a change in the stress-strain curve from strain softening to strain hardening [24].…”