Aggregate production: Fines generation during rock crushing

Guimaraes, Maria; Valdès, Julio R.; Palomino, Angelica M.; Santamarina, J. Carlos

doi:10.1016/j.minpro.2006.08.004

Cited by 80 publications

(34 citation statements)

References 15 publications

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“…15a. The compression curves are in accordance with those obtained from experiments: Bauer [30], Nakata et al [13], Uygar and Doven [38], and Guimaraes et al [3] published similar compression curves. The curves for the overall and core void ratios are largely proportional, but the overall void ratio is much higher due to the voids along the specimen boundaries.…”

Section: Interpretation Of the Compression Curvessupporting

confidence: 89%

“…Furthermore, Fig. 23 compares well with the compression curves obtained for different initial void ratios on Toyoura sand [1] and Ottawa sand [3]. It was found that the value of the granular hardness h s depends strongly on the crushing strength of individual grains.…”

Section: Conclusion Of the Parameter Tests And Fitting Proceduressupporting

confidence: 64%

“…The distribution and magnitude of contact forces are also significant for the shape and type of fragments, when grain crushing takes place (e.g. [2,3]). This implies that fracture mechanical approaches are justified for this level (e.g.…”

Section: Introductionmentioning

confidence: 99%

“…A general shortcoming of all of these approaches is that they cannot handle the formation of fine dust-orders of magnitude smaller than the original grains-as a result of a range in fragment sizes, as it is observed in reality, e.g. in [3]. However, models have already been presented for asperity breakage, and de Bono and McDowell [29] could produce dust through repeated crushing.…”

Section: Introductionmentioning

confidence: 99%

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Grain crushing and high-pressure oedometer tests simulated with the discrete element method

Laufer¹

2015

Granular Matter

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The present paper investigates the influence of microstructural inhomogeneities of brittle grains on grain crushing in cohesionless, frictional granular materials, using the discrete element method. Macrograins are modelled as assemblies of bonded micrograins of different sizes and bond strengths to simulate crushed sandstone. A method is suggested to incorporate fracture mechanical properties in the model through the selection of bond properties. Normal distribution of bond strengths, as well as degraded bonds are assumed to simulate bond defects. Their effects are first examined through single macrograin crushing tests. Then monotonic oedometer compression tests on macrograin ensembles are simulated for a wide range of pressures and different initial void ratios. The paper also explores the applicability of Bauer's macroscopic compression law to the results of simulations of monotonic, oedometric compression tests. Correlations between the properties of individual macrograins, such as crushing strength and bonding defects, and the properties of the grain ensemble, such as granular hardness and grain size distribution are investigated.

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Section: Interpretation Of the Compression Curvessupporting

confidence: 89%

Section: Conclusion Of the Parameter Tests And Fitting Proceduressupporting

confidence: 64%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Grain crushing and high-pressure oedometer tests simulated with the discrete element method

Laufer¹

2015

Granular Matter

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“…In mining operations, for example, granules composed of different mineral species are liberated from the parent geomaterial during fragmentation (Lynch, 1977). Similar processes occur in aggregate manufacturing, where large slabs of rock are broken into dissimilar grains with custom crushers (Kranz, 1979;Guimaraes et al, 2007). In natural resources, the extraction of water and hydrocarbons from heterogeneous formations is often accompanied by a rise in intergranular stress that can lead to the release of migratory fragments generated by the damage induced on softer grains (Koprulu, 2007).…”

Section: Introductionmentioning

confidence: 99%

On comminution and yield in brittle granular mixtures

Einav

Valdès

2008

Journal of the Mechanics and Physics of Solids

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Time-independent compaction behavior of quartz sands

Brzesowsky

Spiers

Peach

et al. 2014

J. Geophys. Res. Solid Earth

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Mechanisms such as grain rearrangement, coupled with elastic deformation and grain breakage, are believed to play an important role in the time-independent compaction of sands, controlling porosity and permeability reduction during burial of clastic sediments and during depletion of highly porous reservoir sandstones. We performed uniaxial compaction experiments on sands at room temperature to systematically investigate the effect of loading history, loading rate, grain size, initial porosity, and chemical environment on compaction. Acoustic emission counting and microstructural methods were used to verify the microphysical compaction mechanisms operating. All tests showed quasi-elastic loading behavior accompanied by permanent deformation, involving elastic grain contact distortion, particle rearrangement, and grain failure. Loading history, grain size, and initial porosity significantly affected stress-strain behavior, with increasing grain size and initial porosity promoting compaction. In contrast, chemical environment and loading rate had little effect. The results formed the basis for a microphysical model aimed at explaining the observed compaction behavior. Two extreme cases were modeled: (I) a pack of spherical grains with a distributed flaw size at failure and (II) a pack of nonspherical grains with a constant mean crack size at failure but a distributed effective surface radius of curvature characterizing distributed contact asperity amplitudes. The best agreement with the grain-size-and porosity-dependent trends observed in our experiments was obtained using case (II) of the model. Combining our experimental and modeling results, it was inferred that a grain-size-dependent departure from sphericity of the grains exerts a key control on the compaction behavior of sands.

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Aggregate production: Fines generation during rock crushing

Cited by 80 publications

References 15 publications

Grain crushing and high-pressure oedometer tests simulated with the discrete element method

Grain crushing and high-pressure oedometer tests simulated with the discrete element method

On comminution and yield in brittle granular mixtures

Time-independent compaction behavior of quartz sands

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