Predicting the behaviour of coal wash and steel slag mixtures under triaxial conditions

Chiaro, Gabriele; Indraratna, Buddhima; Tasalloti, Ali

doi:10.1139/cgj-2013-0476

Cited by 11 publications

(5 citation statements)

References 25 publications

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“…With those specimens on the dry side of CSL, there was dilative behaviour in volumetric strain and peak-softening in stress-strain, and with the specimen on the wet side of CSL, there was volumetric contraction and hardening in deviatoric stress. This behaviour was similar to that reported by a number of previous studies on the behaviour of granular material, for instance, as discussed by Indraratna et al, (1998), Modoni andGazzellone, (2011), andChiaro et al, 2014a. Figure 5 illustrates the typical stress-strain behaviour of all the mixtures under effective confining pressures of 30kPa and 120kPa, and it was evident that the CW content had a significant influence on the shear behaviour.…”

Section: Stress-strain Behavioursupporting

confidence: 88%

A Laboratory Study on the Shear Behavior of Mixtures of Coal Wash and Steel Furnace Slag as Potential Structural Fill

et al. 2015

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The accumulation of industrial waste materials (e.g., coal wash and steel furnace slag) has become a critical environmental problem in Australia in recent years. The possible re-use of these types of materials as structural fill for transport embankments and land reclamation is one of the preferred options from a waste management perspective. Consequently, an experimental testing program was undertaken using the triaxial apparatus to evaluate the shear behavior of compacted mixtures of coal wash (CW) and steel furnace slag (SFS). The effect of varying the confining pressure and the percentage of coal wash on the isotropic compression line, the stress-strain behavior, and particle degradation during drained shearing was evaluated. The percentage of coal wash was found to influence the shearing behavior of the CW-SFS mixtures. When the content of coal wash increased, the shear strength of the CW-SFS mixtures decreased and the axial strain corresponding to the peak stress ratio increased. Moreover, the incidence of particle breakage increased for those mixtures with a higher CW content due to the low particle strength of CW. This paper also provided a non-linear strength envelope and a corresponding empirical equation to capture the shear strength of CW-SFS mixtures. Disciplines Engineering | Science and Technology Studies Publication DetailsTasalloti, S. M. A., Indraratna, B., Rujikiatkamjorn, C., Heitor, A. & Chiaro, G. (2015). A laboratory study on the shear behavior of mixtures of coal wash and steel furnace slag as potential structural fill. Geotechnical Testing Journal, 38 (4), 361-372. AbstractThe accumulation of industrial waste materials (e.g. coal wash and steel furnace slag) has become a critical environmental problem in Australia in recent years. The possible re-use of these types of materials as structural fill for transport embankments and land reclamation is one of the preferred options from a waste management perspective. Consequently, an experimental testing program was undertaken using the triaxial apparatus to evaluate the shear behaviour of compacted mixtures of coal wash (CW) and steel furnace slag (SFS). The effect of varying the confining pressure and the percentage of coal wash on the isotropic compression line, the stress-strain behaviour, and particle degradation during drained shearing was evaluated. The percentage of coal wash was found to influence the shearing behaviour of the CW-SFS mixtures. When the content of coal wash increased the shear strength of the CW-SFS mixtures decreased and the axial strain corresponding to the peak stress ratio increased. Moreover, the incidence of particle breakage increased for those mixtures with a higher CW content due to the low particle strength of CW. This paper also provides a non-linear strength envelope and a corresponding empirical equation to capture the shear strength of CW-SFS mixtures.

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Section: Stress-strain Behavioursupporting

confidence: 88%

A Laboratory Study on the Shear Behavior of Mixtures of Coal Wash and Steel Furnace Slag as Potential Structural Fill

et al. 2015

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“…void ratio vs mean effective stress) due to particle degradation. Chiaro et al (2015) found that the CSL for SFS+CW blends was not unique and was sensitive to the mix proportions and the extent of grain degradation upon loading. In view of the abovementioned reasons, experimental observations from past studies conducted on soil-rubber chips/fibre mixtures or traditional granular soils such as sands cannot be extrapolated to interpret or predict the behaviour of the current SFS+CW+RC matrix.…”

Section: Introductionmentioning

confidence: 97%

Predicted Behavior of Saturated Granular Waste Blended with Rubber Crumbs

Indraratna

Coop

2019

Int. J. Geomech.

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Recycling waste materials such as steel furnace slag (SFS), coal wash (CW), and rubber crumbs (RC) for transport infrastructure is environmentally friendly and offers significant economic benefits. This paper presents a fundamental study of the geotechnical characteristics of this blended matrix (SFS+CW+RC). A semi-empirical constitutive model for SFS+CW+RC mixtures is proposed within the framework of critical state soil mechanics and based on the bounding surface plasticity theory. A critical state surface is formulated with the changing RC contents in the waste mixtures, and an experimental relationship between the total work input () and critical state parameter () is established to capture the energy absorbing capacity of the matrix. The theoretical model is validated using two sets of data, i.e. very recent triaxial test data obtained by the authors and totally independent test results from a past study conducted on sand-RC mixtures.

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“…Leventhal, 1996;Okagbue and Ochulor, 2007;Rujikiatkamjorn et al, 2013;Heitor et al 2016), coal tailings (e.g. Indraratna et al, 1994;Williams et al, 1995;Morris and Williams, 1997;Williams and King, 2016) and mixtures of coal wash and other waste materials like steel furnace slag and rubber crumbs (Chiaro et al, 2014, Indraratna et al, 2018Qi et al, 2018, Indraratna et al, 2019 was studied widely in the literature. Some of these studies have demonstrated that marginal materials like coal wash have acceptable geotechnical properties to be used as a construction fill in port reclamation projects (e.g.…”

Section: Introductionmentioning

confidence: 99%

“…Some of these studies have demonstrated that marginal materials like coal wash have acceptable geotechnical properties to be used as a construction fill in port reclamation projects (e.g. Rujikiatkamjorn et al, 2013;Chiaro et al, 2014, Tasalloti et al, 2015 or as a subballast layer in railways (Indraratna et al, 2018). However, the reuse of coal wash as base/subbase material in pavement construction has not been systematically explored in past studies on waste materials.…”

Section: Introductionmentioning

confidence: 99%