Abstract
Owing to its environment‐friendly, economically available, and sustainable property, the palm fiber was attempted to improve the quality of Shanghai clayey soil together with lime. The direct shear tests (DST), ultrasonic pulse velocity tests (UPV), and the unconfined compressive tests (UCT) have been carried out on soils mixed with palm fiber and lime under 3 curing conditions of immersion in water, cyclic wetting‐drying, and air curing at a series of contents of additives. The corresponding indexes of shear strength (τ), cohesion (c), internal friction angle (φ), initial shear modulus (G0), and unconfined compressive strength (qu) were obtained and analyzed. Results show that immersed‐in‐water environment is optimum for the formation of shear strength, initial shear modulus, cohesion, and unconfined compressive strength (UCS), while the air curing condition is the worst for admixture treated soil. Lime can increase G0, but palm fiber can slightly reduce G0. Lime has significant effect on increase of internal friction angle; on the contrary, palm fiber has only limited effect. c/G0 for any type of sample remains almost constant under different curing conditions. It demonstrates that c and G0 possess the comparative development trend under different curing environment.
Highlights
Shanghai clayey soil is a type of soil that has special properties, for example, a low content of sand and gravel, the relatively small grain size, low permeability, high plasticity, very high moisture and void ratio, and high compressibility, which result in the low strength, and is vulnerable to deformation [1]
Because of the microstructure characteristics in void and structural form, poor engineering features commonly exist with Shanghai clayey soil, of which high compressibility and low strength are most prominent for engineering construction [3]
Shanghai clayey soil cannot generally satisfy the requirements from geotechnical engineering construction before it is well processed. erefore, many compacting methods have been attempted for the stabilizing of Shanghai natural soil, which have been involved in many types of admixtures commonly applied in soil enhancement with significant effects
Summary
Shanghai clayey soil is a type of soil that has special properties, for example, a low content of sand and gravel, the relatively small grain size, low permeability, high plasticity, very high moisture and void ratio, and high compressibility, which result in the low strength, and is vulnerable to deformation [1]. Because of the microstructure characteristics in void and structural form, poor engineering features commonly exist with Shanghai clayey soil, of which high compressibility and low strength are most prominent for engineering construction [3]. Many investigations have been carried out on the shear strength property of different type of admixture-reinforced clayey soil under diverse conditions [6,7,8,9,10,11,12]. E unconfined compressive tests have been carried out on reinforced soil to evaluate the influences of varied types of fibers on the unconfined compressive strengths of it [13, 14]. The ultrasonic pulse velocity technology has increasingly been used in the evaluation of mechanical performance of soil and concrete in recent decades [15,16,17,18]
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