This paper reports the results of laboratory study performed on expansive soil reinforced with geofibers and demonstrates that discrete and randomly distributed geofibers are useful in restraining the swelling tendency of expansive soils. Swelling characteristics of remoulded expansive soil specimens reinforced with varying fiber content (f = 0.25% and 0.50%) and aspect ratio (l/b = 15, 30 and 45) were studied. One-dimensional swell-consolidation tests were conducted on oedometer specimens. Reduction in heave and swelling pressure was the maximum at low aspect ratios at both the fiber contents of 0.25% and 0.50%. Finally, the mechanism by which discrete and randomly distributed fibers restrain swelling of expansive soil is explained with the help of soil-fiber interaction. © 2008 Elsevier Ltd. All rights reserved.

B.V.S. viswanadham

B.R. Phanikumar

Viswanadham B.V.S

R.V. Mukherjee

Phanikumar B.R

Mukherjee R.V.

Expansive soil

Fiber reinforcement

Fibers

Swell-consolidation test

swelling

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Geotextiles and Geomembranes

Fulltext

Soils and Foundations

Swell-consolidation characteristics of fibre-reinforced expansive soils

Journal of Materials in Civil Engineering

Evaluation of Tensile Strength-Strain Characteristics of Fiber-Reinforced Soil through Laboratory Tests

The objective of this study was to examine the influence of discrete and randomly distributed fibres on heave of an expansive soil. One-dimensional swell tests were conducted on a remoulded expansive soil with and without fibres. In this study, fibre content was varied as 0.25 and 0.5% and fibre length as 30, 60 and 90 mm. A twin semi-circular-shaped fabricated mould with a front Perspex sheet was developed for testing. Digital imaging technique was used to observe heave of the soil in both unreinforced and fibre-reinforced conditions. Displacement profiles obtained from image analysis were used for interpreting swell or upward movement profiles of the specimens. Heave observed in the digital image analysis was compared with that obtained from dial gauge readings. Reduction in heave was directly proportional to fibre content and fibre length. Reduction in heave was the maximum at low aspect ratios at both fibre contents of 0.25 and 0.5%. Test results revealed that fibre length is a key factor that influences the reinforcing effect of fibre. Discrete and randomly distributed fibres were found efficacious in reducing heave. © 2009 Thomas Telford Ltd.

Geosynthetics International

Effect of polypropylene tape fibre reinforcement on swelling behaviour of an expansive soil

In this study, an attempt has been made to investigate the influence of flyash columns (FACs) on the expansive soil using different percentages of flyash and calcium carbide residue (CCR) to reduce heave of expansive soil bed. Puzzolanic activity of the binder admixture has been studied by replacing the columns admixture by sand in the vertical columns in the soil specimen. Conventional Oedometer tests have been performed. Free swell index (FSI) and particle size distribution tests have also been conducted as post-tests. It has been observed that swell properties considerably reduce with vertical fly ash columns in the expansive soil bed. © Springer Nature Singapore Pte Ltd 2019.

Lecture Notes in Civil Engineering

Swell behavior of expansive soils with stabilized fly ash columns

A locally available expansive clay was reinforced with polypropylene fibers of cut-lengths 6, 12, and 18 mm and a fiber content of 0.5% by dry weight of the clay. The unreinforced and fiber-reinforced clay specimens mixed at a state close to liquid limit were subjected to five subsequent drying and wetting cycles. The desiccation tests were performed at a constant temperature and relative humidity. Crack propagation, moisture loss due to evaporation, and crack feature measurements were monitored. Digital image analysis (DIA) was used to measure the surfacial crack feature measurements. The results indicate that the desiccation cracking behavior was considerably affected by the subsequent drying and wetting cycles. The severity of cracks in unreinforced specimens increased with an increase in the number drying-wetting cycles and reached a stable value after three cycles. However, in the case of polypropylene fiber-reinforced clay specimens, bridging effect was predominant, and in turn integrity of soil matrix was maintained. The smaller crack widths and reduced cracked areas indicate the significant influence of discrete and randomly distributed fiber reinforcement in expansive clay layers. © 2018 American Society of Civil Engineers (ASCE). All rights reserved.

Geotechnical Special Publication

Some Studies on Desiccation Cracking of Fiber-Reinforced Expansive Clay Subjected to Drying and Wetting Cycles

Laboratory study of expanded polystyrene (EPS) geofoam used with expansive soils

Numerical simulation of fiber-reinforced sand behavior

Soil Improvement

Beneficial Use of Waste Tire Rubber for Swelling Potential Mitigation in Expansive Soils

Closure to “Volume Change Behaviors of Expansive Soils Stabilized with Recycled Ashes and Fibers” by Koonnamas Punthutaecha, Anand J. Puppala, Sai K. Vanapalli, and Hilary Inyang

Strength and mechanical behavior of short polypropylene fiber reinforced and cement stabilized clayey soil

Swelling behaviour of a geofiber-reinforced expansive soil

Journal	Geotextiles and Geomembranes
ISSN	2661144
Open Access	No