Evolution of grain-size distribution of pumice sands in 1-D compression

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Abstract

Crushing is one of the micromechanisms that govern the mechanical behaviour of sands at medium-high stresses. It depends on mineralogy, form and strength of single particle, mean stress level, coordination number, time, etc.. It causes changes of grain-size distribution, porosity, number and type of grain contacts, fabric, structure of the material, etc.. Results of an experimental research on the crushing of pumice sands compressed under 1-D conditions to vertical effective stresses ′v up to 100 MPa are reported here. They show marked crushing already at ′v of about 200 kPa. The evolution of the grain-size distribution can be represented by Di= h/(K(1+C exp(–hlgv))) in which Di is the decrement of the generic characteristic diameter. C, h, K are positive parameters depending on the sand’s nature and initial state. This relation properly accounts for the existence of an upper limit to Di (or the existence of a limit grading). It is able also to describe the evolution of the global relative breakage indexes.
Lingua originaleEnglish
pagine (da-a)27-32
Numero di pagine6
RivistaProcedia Engineering
Volume158
Stato di pubblicazionePublished - 2016

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Crushing
Abrasives
Compaction
Sand
Mineralogy
Porosity

All Science Journal Classification (ASJC) codes

  • Engineering(all)

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title = "Evolution of grain-size distribution of pumice sands in 1-D compression",
abstract = "Crushing is one of the micromechanisms that govern the mechanical behaviour of sands at medium-high stresses. It depends on mineralogy, form and strength of single particle, mean stress level, coordination number, time, etc.. It causes changes of grain-size distribution, porosity, number and type of grain contacts, fabric, structure of the material, etc.. Results of an experimental research on the crushing of pumice sands compressed under 1-D conditions to vertical effective stresses ′v up to 100 MPa are reported here. They show marked crushing already at ′v of about 200 kPa. The evolution of the grain-size distribution can be represented by Di= h/(K(1+C exp(–hlgv))) in which Di is the decrement of the generic characteristic diameter. C, h, K are positive parameters depending on the sand’s nature and initial state. This relation properly accounts for the existence of an upper limit to Di (or the existence of a limit grading). It is able also to describe the evolution of the global relative breakage indexes.",
author = "Maurizio Ziccarelli",
year = "2016",
language = "English",
volume = "158",
pages = "27--32",
journal = "Procedia Engineering",
issn = "1877-7058",
publisher = "Elsevier BV",

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TY - JOUR

T1 - Evolution of grain-size distribution of pumice sands in 1-D compression

AU - Ziccarelli, Maurizio

PY - 2016

Y1 - 2016

N2 - Crushing is one of the micromechanisms that govern the mechanical behaviour of sands at medium-high stresses. It depends on mineralogy, form and strength of single particle, mean stress level, coordination number, time, etc.. It causes changes of grain-size distribution, porosity, number and type of grain contacts, fabric, structure of the material, etc.. Results of an experimental research on the crushing of pumice sands compressed under 1-D conditions to vertical effective stresses ′v up to 100 MPa are reported here. They show marked crushing already at ′v of about 200 kPa. The evolution of the grain-size distribution can be represented by Di= h/(K(1+C exp(–hlgv))) in which Di is the decrement of the generic characteristic diameter. C, h, K are positive parameters depending on the sand’s nature and initial state. This relation properly accounts for the existence of an upper limit to Di (or the existence of a limit grading). It is able also to describe the evolution of the global relative breakage indexes.

AB - Crushing is one of the micromechanisms that govern the mechanical behaviour of sands at medium-high stresses. It depends on mineralogy, form and strength of single particle, mean stress level, coordination number, time, etc.. It causes changes of grain-size distribution, porosity, number and type of grain contacts, fabric, structure of the material, etc.. Results of an experimental research on the crushing of pumice sands compressed under 1-D conditions to vertical effective stresses ′v up to 100 MPa are reported here. They show marked crushing already at ′v of about 200 kPa. The evolution of the grain-size distribution can be represented by Di= h/(K(1+C exp(–hlgv))) in which Di is the decrement of the generic characteristic diameter. C, h, K are positive parameters depending on the sand’s nature and initial state. This relation properly accounts for the existence of an upper limit to Di (or the existence of a limit grading). It is able also to describe the evolution of the global relative breakage indexes.

UR - http://hdl.handle.net/10447/262059

M3 - Article

VL - 158

SP - 27

EP - 32

JO - Procedia Engineering

JF - Procedia Engineering

SN - 1877-7058

ER -