Effect of Fly-Ash Stabilization on Stiffness Modulus Degradation of Expansive Clays

Saride, Sireesh; Dutta, Troyee Tanu

doi:10.1061/(asce)mt.1943-5533.0001678

Cited by 41 publications

(7 citation statements)

References 25 publications

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“…Also, the small strain shear modulus (G max ) of present silt-rich fly ash was found to be in the range of G max of fly ash reported by Choo et al [111] and Chattaraj and Sengupta [63]. The normalized shear modulus (G/G max ) of the present fly ash represents broadly from 0.9 to 0.3 using cyclic triaxial and bender element test when compared with resonant column test, G/G max value was found to be 1 to 0.82 [17] and 1 to 0.5 [112]. Liu et al [113] performed dynamic triaxial tests on fly ash-soil composite under freezing and thawing condition and found better response from fly ash-soil than that of silty clay.…”

Section: Comparison With the Past Literature Worksupporting

confidence: 53%

Experimental investigation on dynamic behavior of silt-rich fly ash using cyclic triaxial and bender element tests

Ram

Mohanty

2021

Innov. Infrastruct. Solut.

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The present study mainly focuses on the evaluation of dynamic properties of silt-rich fly ash from Renukoot, India, under large and small strain conditions using cyclic triaxial and bender element test, respectively. The influence of confining pressure, loading frequency, relative compaction, and shear strain amplitude on dynamic properties of fly ash under small strain and large strain condition has also been studied. The dynamic shear modulus (G) found experimentally from cyclic triaxial test shows the decay in a nonlinear manner with the increment of loading frequency and cyclic shear strain. The increment in dynamic shear modulus of fly ash was noticed with the increment of relative compaction and confining pressure. Similarly, the increase in small strain shear modulus (G max ) was observed with the increment of confining pressure, relative compaction, and frequency of the waveform. The decrease in damping ratio was observed with an increase in shear strain, especially for higher strain side (i.e., γ > 0.5%) but vice versa is not true for lower strain side (γ < 0.5%). Therefore, irrespective of the soil type, there exists a threshold strain beyond which damping ratio decreases with an increase in shear strain. All the parameters except loading frequency have a prominent impact on G and G max is sensitive to the entire considered factors. Finally, empirical correlations were developed between normalized shear modulus ratio (G/G max ) and damping ratio (D) of silt-rich fly ash with cyclic shear strain (γ) at different confining pressure, relative compaction, and loading frequency. The developed correlations can be helpful in calculating the dynamic properties of Renukoot fly ash at different strain levels. The developed correlations will also assist in the safe design of structures with fly ash as geo-material in the seismic-prone regions.

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Section: Comparison With the Past Literature Worksupporting

confidence: 53%

Experimental investigation on dynamic behavior of silt-rich fly ash using cyclic triaxial and bender element tests

Ram

Mohanty

2021

Innov. Infrastruct. Solut.

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“…In addition, the significant improvement in natural frequency of the foundation bed was observed in the presence of stiff layer nearer to the surface footing. Few studies evaluated the reduction in ground vibration by the stabilization of soil bed (Mitchell, 1981;Baker, 1982;Welsh, 1986;Saride and Dutta, 2016). Currently, the reinforced earth technique being popularly used for strengthening the subgrade in order to support the static and cyclic loads (Hegde, 2017).…”

Section: Type Of Vehicle Train Truck Bus Carmentioning

confidence: 99%

Mitigation of Traffic Induced Vibration Using Geocell Inclusions

Hegde

Venkateswarlu

2019

Front. Built Environ.

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This paper describes the potential use of geocell reinforcement in mitigating the traffic induced vibration. The vibration caused by the vehicular movement was simulated over the unreinforced and geocell reinforced sections using a mechanical oscillator. The displacement amplitude and peak particle velocity were measured to understand the vibration mitigation efficacy of geocell. The effect of depth of placement of geocell on the mitigation of vibration parameters was studied. The inclusion of geocell was found effective in reducing the induced vibration based on the experimental results. The vibration mitigation efficacy of geocell was improved significantly at the shallow depth of placement of geocell mattress. The improvement in elasticity of the subgrade was observed maximum when the geocell was placed at a depth of 0.1B from the ground surface. Further, analytical and numerical approaches were used to predict the displacement amplitude vs. frequency response of reinforced soil sections. FLAC3D was used for performing the numerical investigation. The geocell was modeled according to its honeycomb shape to acquire the accurate response of geocell reinforced section. Whereas, mass spring dashpot analogy was followed for the analytical evaluation. In overall, the amplitude response predicted from the numerical and analytical studies were found to be in good agreement with the experimental results.

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“…The dynamic shear modulus (G d ) and the damping ratio (λ) are the main parameters to describe the stiffness and energy dissipation characteristics of subgrade fillings. Some studies [23][24][25][26] have been carried out on the dynamic response of soil that has been reinforced with various stabilizers and synthetic fibers, such as class C FA, PF, lime, cement, etc. These experimental works reveal that that the dynamic modulus increased with the addition of reinforcing materials, and some investigations [25,26] also found considerable decreases in λ after reinforcement.…”

Section: Introductionmentioning

confidence: 99%

“…Some studies [23][24][25][26] have been carried out on the dynamic response of soil that has been reinforced with various stabilizers and synthetic fibers, such as class C FA, PF, lime, cement, etc. These experimental works reveal that that the dynamic modulus increased with the addition of reinforcing materials, and some investigations [25,26] also found considerable decreases in λ after reinforcement. However, these investigations on dynamic properties were mainly focused on clayey soils, and few works have been conducted on loess, especially regarding F-T effects.…”

Section: Introductionmentioning

confidence: 99%

Effects of Cyclic Freezing–Thawing on Dynamic Properties of Loess Reinforced with Polypropylene Fiber and Fly Ash

Chen

Luo

et al. 2022

Water

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Periodic freezing–thawing is recognized as a real threat to the mechanical properties of reinforced loess, which has been used in the recent construction of high-speed railways in northwest China; however, the performance of these materials under periodic freezing–thawing and dynamic loading has rarely been investigated. In this work, dynamic triaxial tests were conducted on fly ash- and polypropylene fiber-reinforced loess with different blend ratios and freeze–thaw cycles. The dynamic shear modulus and damping ratio were investigated. The results revealed that cyclic freezing–thawing had a remarkable effect on the dynamic shear modulus and damping ratio, which demonstrated considerable reductions and increases, respectively, after cyclic freezing–thawing. Additionally, the dynamic shear modulus increased notably with the fly ash content and confining pressure and decreased with the water content. Meanwhile, the damping ratio increased with the fiber content and water content and decreased with the fly ash content and confining pressure. Comparatively, the effects of polypropylene fiber on dynamic behavior were found to be not significant. Furthermore, novel models were established to predict the dynamic shear modulus and damping ratio for reinforced loess. The results provide more information towards infrastructure design in seasonal frozen regions.

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Effect of Fly-Ash Stabilization on Stiffness Modulus Degradation of Expansive Clays

Cited by 41 publications

References 25 publications

Experimental investigation on dynamic behavior of silt-rich fly ash using cyclic triaxial and bender element tests

Experimental investigation on dynamic behavior of silt-rich fly ash using cyclic triaxial and bender element tests

Mitigation of Traffic Induced Vibration Using Geocell Inclusions

Effects of Cyclic Freezing–Thawing on Dynamic Properties of Loess Reinforced with Polypropylene Fiber and Fly Ash

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