Abstract
Clay reinforcement through appropriate applications of waste fiber or waste fiber fabric can generate huge economic and environmental benefits. In this study, clay was reinforced using waste polyester fiber filaments and waste polyester fabric blocks, respectively. Triaxial tests (σ1 > σ2 = σ3) were carried out to examine the influence of reinforcement method and the contents (0.0%, 0.5%, 1.0%, 1.5%) on the shear behavior of clay. After reinforcement, the deformation resistance and shear strength of the clay was improved. The optimal contents of fiber filament and fabric block were both 1.0%; as the fiber filament or fabric block content increased from 0.5% to 1.5%, the stiffness of the reinforced clay decreased, while the energy absorption capacity and the cohesive strength first increased and then decreased. Under the optimal content condition, the fiber filament showed better reinforcement than the fabric block. Under the train hardening condition, a hyperbolic model can be used to quantitatively describe the stress-strain relationship of the reinforced clay, and the model parameters can also reflect the strain hardening degree.
Highlights
Clay reinforcement through appropriate applications of waste fiber or waste fiber fabric can generate huge economic and environmental benefits
Hataf et al 2006 noted that the bearing capacity reached its peak under the optimal content and optimal length based on California bearing ratio (CBR) test results, which showed the best reinforcement effect[17]
This study aims to promote the application of waste polyester fiber or waste polyester fabric blocks in clay reinforcement
Summary
Clay reinforcement through appropriate applications of waste fiber or waste fiber fabric can generate huge economic and environmental benefits. Fiber reinforcement can significantly improve the peak compressive strength and shear strength of clay[4,5], effectively inhibit clay cracking and deformation[6,7], increase the ductility of clay, and reduce the post-peak strength loss[8] It has the advantages of simple on-site operation, low cost, and wide application range, and has become the most commonly-used method in this type of engineering[9]. Chen et al 2015 used fiber fabric blocks prepared from waste polypropylene fiber bags to reinforce cement-solidified sand, and determined the effects of fiber content, fiber length, and curing age on unconfined compressive strength[5]. Hataf et al 2006 noted that the bearing capacity reached its peak under the optimal content and optimal length based on CBR test results, which showed the best reinforcement effect[17]
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