Influences of Curing Environment on Strength Performances of Shanghai Clayey Soil Reinforced with Palm Fiber

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 be...

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Bibliographic Details
Published in:Advances in civil engineering 2020, Vol.2020 (2020), p.1-11
Main Authors: Qu, Jili, Xiong, Kun
Format: Article
Language:English
Subjects:
Additives
Admixtures
Civil engineering
Clay soils
Cohesion
Compressive strength
Curing
Drinking water
Internal friction
Mechanical properties
Physical properties
Shear modulus
Shear strength
Shear tests
Soil lime
Submerging
Tensile strength
Wetting
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Summary: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.
ISSN:1687-8086
1687-8094
DOI:10.1155/2020/9670806