The purpose of this investigation was to identify and quantify the effect of numerous variables on the performance of fiber-stabilized sand specimens. Laboratory unconfined compression tests were conducted on sand specimens reinforced with randomly oriented discrete fibers to isolate the effect of each variable on the performance of the fiber-reinforced material. Five primary conclusions were obtained from this investigation. First, the inclusion of randomly oriented discrete fibers significantly improved the unconfined compressive strength of sands. Second, an optimum fiber length of 51 mm (2 in.) was identified for the reinforcement of sand specimens. Third, a maximum performance was achieved at a fiber dosage rate between 0.6 and 1.0% dry weight. Fourth, specimen performance was enhanced in both wet and dry of optimum conditions. Finally, the inclusion of up to 8% of silt does not affect the performance of the fiber reinforcement.

Closure of "Engineering Properties of Sand-Fiber Mixtures for Road Construction"

Volume instability of expansive soils due to moisture fluctuations is often disastrous, causing severe damages and distortions in the supported structures. It is, therefore, necessary to adequately improve the performance of such soils that they can favorably fulfil the post-construction stability requirements. This can be achieved through chemical stabilization using additives such as lime, cement and fly ash. In this paper, suitability of such additives under various conditions and their mechanisms are reviewed in detail. It is observed that the stabilization process primarily involves hydration, cation exchange, flocculation and pozzolanic reactions. The degree of stabilization is controlled by several factors such as additive type, additive content, soil type, soil mineralogy, curing period, curing temperature, delay in compaction, pH of soil matrix, and molding water content, including presence of nano-silica, organic matter and sulfate compounds. Provision of nano-silica not only improves soil packing but also accelerates the pozzolanic reaction. However, presence of deleterious compounds such as sulfate or organic matter can turn the treated soils unfavorable at times even worser than the unstabilized ones. 

Stabilization of expansive soils using chemical additives: A review

The effect of freeze-thaw cycling on the mechanical properties of expansive soils

Effects of freeze-thaw cycles on mechanical properties of polypropylene Fiber and cement stabilized clay

The random distribution of polypropylene fibers in concrete mixtures leads to an increase in abrasion and freeze-thaw resistance, a decrease in volume expansions formed as a result of sulfate attac...

Effect of the addition of polypropylene fiber on concrete properties

Accumulative plastic strain of thawed saturated clay under long-term cyclic loading

Freeze-thaw effects are the main reason that cause damage and instability
to engineering structures in cold regions. Laboratory tests for freeze-thaw
effects on soil geotechnical properties have made great progress during
the past decade. Based on analyzing and summing up current freeze-thaw
test methods for soil, the research results in effects of freeze-thaw
on the structures, basic physical parameters and mechanical properties
of soil and corresponding frost-resistant measures for soil are summarized,
the main results shown as followed: (1) an united freeze-thaw test
method is the base of analyzing the freeze-thaw effects on soil geotechnical
properties and establishing soil database for freeze-thaw properties.
(2) Degrees of freeze-thaw effects on soil structure depend on particle
size distribution, pore shape and initial moisture content of soil.
(3) Freeze-thaw test method and initial state of soil are the main
reasons that determine the influence degree of freeze-thaw effects
on physical properties of soil, and some physical properties of soil
will not be affected by freeze-thaw effects when the corresponding
parameters value at a critical state. (4) Strength and modulus of
soil decrease with the increasing freeze-thaw cycles at first, and
tend to a stable state later. But there are differences in the change
rules of freeze-thaw effects on the shear strength parameters because
of diversity of test method and initial state of soil. And the phenomenon
of temperature threshold during the thawing process of soil should
be noted. (5) Methods of mitigating the freeze-thaw effects on soil
geotechnical properties should be started by improving the particle
size distribution, pore shape, and initial moisture content of soil.

A review of freeze-thaw effects on soil geotechnical properties

Determination of allowable subgrade frost heave with the pavement roughness index in numerical analysis

The shear properties and creep properties of thawed saturated clay were studied at different stress levels based on a series of undrained triaxial shear tests and creep tests. A hyperbolic creep model was employed to fit the obtained strain-time curves based on analyzing the evolution of the creep strain, the fitting parameters were also determined. The results show that the hyperbolic creep model can be used for predicting the evolution of creep strain for thawed saturated subgrade clay.

Experimental Study on Creep Behavior for Thawed Saturated Clay

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