Impact of particle shape on breakage of recycled construction and demolition aggregates

Afshar, Tabassom; Disfani, Mahdi M.; Arulrajah, Arul; Narsilio, Guillermo A.; Emam, Sacha

doi:10.1016/j.powtec.2016.11.043

Cited by 114 publications

(29 citation statements)

References 43 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…is study showed that the breakage ratios approach 0.32 under cuboidal face, cylindrical end, and cylindrical side impacts and that the breakage ratios approach 0.18 under cuboidal edge, cuboidal corner, and cylindrical corner impacts; the authors insisted that the reason for these phenomena is that the difference in loading area makes the difference in the wall forces that work on agglomerates. According to the investigation of Afshar et al [13], the breakage strength of bulky construction particles (sphericity varies from 0.8 to 0.84) is higher than that of elongated construction particles (sphericity varies from 0.7 to 0.74); thus, the bulky particles have a lower degree of breakage under the same compression conditions and they consume a higher energy density to have the same fragmentation results as the elongated particles. In a recent study by Yan et al [14], it was observed that the difference in rock shape and impact angle can result in a great difference in loading mode and breakage results for reinforced concrete slabs.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Effects of the Shape and Size of Irregular Particles on Specific Breakage Energy under Drop Weight Impact

Gan

Gao

Zhang

et al. 2019

Shock and Vibration

View full text Add to dashboard Cite

Particle shape and size are main factors influencing particle breakage. Single-particle breakage tests were conducted on irregular magnetite ore using modified drop weight impact equipment to analyze the effect of shape and size on specific breakage energy. A method to measure the effective breakage energy is presented. Ore particles with different sphericities and different sizes were broken into several fragments with differing impact energies in the tests. Experimental studies indicate that the shape of particles significantly influences the impact loading mode and breakage progress; the specific breakage energy has an obvious relationship with the sphericity and the initial size. The specific breakage energy decreases with larger initial loading area. The particle needs less specific breakage energy if the shape or placement state is more conducive to tensile fracture. There is an increase in specific breakage energy corresponding to an increase in particle sphericity with fixed initial size range. With the increase in the initial size of the particle, the specific breakage energy decreases with fixed sphericity range, which presents a power function with the exponent −0.5. The comprehensive relationship between specific breakage energy, particle sphericity, and initial size was established, showing that the input power of the crushing machinery and the optimization of crushing technology should be performed with consideration of the influence of particle shape and initial size to reduce specific energy consumption and improve energy efficiency.

show abstract

Section: Introductionmentioning

confidence: 99%

“…e samples were washed and air-dried; the mass of the dry samples was 55-1082 g (Figure 1). [10,11,13,14]. e formula of sphericity is given by…”

Section: Introductionmentioning

confidence: 99%

Effects of the Shape and Size of Irregular Particles on Specific Breakage Energy under Drop Weight Impact

Gan

Gao

Zhang

et al. 2019

Shock and Vibration

View full text Add to dashboard Cite

show abstract

“…The other method is to properly ignore the near-boundary area through the particle dilation process of the SDEM. It is concluded from existing literature [10,11,31] that the breakage is mainly caused by tensile failures inside the particle. Therefore, the exact values of boundary displacement may not be crucial for particle fragmentation, and the analysis of Cauchy principal values for the particles is deemed unnecessary.…”

Section: Avoid the Near-boundary Singularitymentioning

confidence: 99%

“…The third and fourth condition, Eqs. (31) and (32), are introduced to examine a particle's loading magnitudes and loading history to only improve the computational efficiency. They do not affect the results of the simulation.…”

Section: Criteria For the Evaluation Of Sub-particle Stressmentioning

confidence: 99%

A boundary-spheropolygon element method for modelling sub-particle stress and particle breakage

Jiang

Herrmann

Alonso‐Marroquín

2019

Computers and Geotechnics

View full text Add to dashboard Cite

“…Particle shape has well-known effects on the characteristics of granular soils including packing density (Cho et al 2006;Shin and Santamarina 2013;Zheng and Hryciw 2016) and fabric (Maeda et al 2010;Turner et al 2016;Zhao and Zhou 2017), and also can have significant effects on mechanical properties like compressibility (Rousé et al 2008;Shin and Santamarina 2013;Gong and Liu 2017), shear modulus (Cho et al 2006;Shin and Santamarina 2013), shear strength (Varadarajan et al 2003;Guo and Su 2007;Rousé et al 2008;Yang and Wei 2012;Shin and Santamarina 2013;Yang and Luo 2015;Xiao et al 2019), dilation (Guo and Su 2007;Yang and Luo 2015;Xiao et al 2019), susceptibility to liquefaction (Tsomokos and Georgiannou 2010;Yang and Wei 2012; and Luo 2015), particle breakage during shearing (Afshar et al 2017;Cavarretta et al 2017), and failure mode during shearing (Alshibli et al 2017). Particle shape may also affect the hydraulic conductivity of granular soils (Côté et al 2011).…”

Section: Introductionmentioning

confidence: 99%

Thermal Conductivity of Granular Soil Mixtures with Contrasting Particle Shapes

Xiao

Nan

et al. 2020

J. Geotech. Geoenviron. Eng.

View full text Add to dashboard Cite

Particle shape is known to affect the mechanical behavior of sands as it influences packing density and particle contacts. Even though the thermal conductivity of sands also depends on packing density and particle contacts, the effects of particle shape on thermal conductivity are not well understood. A series of thermal needle tests were conducted on five granular soil mixtures with different proportions of rounded and angular glass particles having the same mineral composition and gradation. The maximum and minimum void ratios and the packing density of these mixtures were found to depend on the overall regularity, defined as the average value of the particle's aspect ratio, convexity and sphericity. For a given overall regularity, the thermal conductivity increases with decreasing void ratio or increasing relative density. Interestingly, the overall regularity has a small effect on the thermal conductivity at a given void ratio but has a significant effect on the thermal conductivity at a given relative density. A particle shape-dependent empirical equation is proposed to quantify the effects of relative density and overall regularity on the thermal conductivity of the tested sand.

show abstract

Impact of particle shape on breakage of recycled construction and demolition aggregates

Cited by 114 publications

References 43 publications

Effects of the Shape and Size of Irregular Particles on Specific Breakage Energy under Drop Weight Impact

Effects of the Shape and Size of Irregular Particles on Specific Breakage Energy under Drop Weight Impact

A boundary-spheropolygon element method for modelling sub-particle stress and particle breakage

Thermal Conductivity of Granular Soil Mixtures with Contrasting Particle Shapes

Contact Info

Product

Resources

About