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Svagt naturgrus och bergkrossmaterial till bärlager : en laboratoriestudie

Markholm, Carl-Owe (1986) In Examensarbeten i geologi vid Lunds universitet
Department of Geology
Abstract
lnvestigation of weak gravel for road construction has been going on at VTI for many years. The overall aim has been to find test methods that correspond with what happens in the road and that are easy to use in any road laboratory.
Following methods have been used in this investigation: planetarytype mixer for wear tests, freeze-thaw variation for weathering tests, Californian Bearing Ratio (CBR) for control of bearing capacity and impact value for control of blow resistance.
Gravel from different types of weak material from different parts of Sweden have been tested: schisty gravel, weathered gravel and different types of crushed rock.
Maximum wearing happens in wet conditions, therefore water has been added to the
materials during... (More)
lnvestigation of weak gravel for road construction has been going on at VTI for many years. The overall aim has been to find test methods that correspond with what happens in the road and that are easy to use in any road laboratory.
Following methods have been used in this investigation: planetarytype mixer for wear tests, freeze-thaw variation for weathering tests, Californian Bearing Ratio (CBR) for control of bearing capacity and impact value for control of blow resistance.
Gravel from different types of weak material from different parts of Sweden have been tested: schisty gravel, weathered gravel and different types of crushed rock.
Maximum wearing happens in wet conditions, therefore water has been added to the
materials during the above mentioned tests.
Increase in amount of fine material (less then 0.074 mm) after each test was checked and compared with the composition of the original material from each locality.
The investigation shows that different test methods detect different kinds of weakness in the investigated materials. E g freeze-thaw variation seems to give the best results for porous limestone, while the planetary-type mixer is a good standard of value for particularly schisty material. The latter method has however some disadvantages due to weak construction of the equipment. Consequently one test method doesn't seem to be enough to answer the questions about the weakness of gravel. (Less)
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author
Markholm, Carl-Owe
supervisor
organization
year
type
H1 - Master's Degree (One Year)
subject
keywords
bergkrossmaterial, naturgrus, geografi, geologi
publication/series
Examensarbeten i geologi vid Lunds universitet
report number
11
language
Swedish
additional info
Curt Wichmann, bergsingenjör vid Statens Väg- och Trafikinstitut.
id
2371212
date added to LUP
2012-05-22 11:53:04
date last changed
2012-05-22 11:57:29
@misc{2371212,
  abstract     = {lnvestigation of weak gravel for road construction has been going on at VTI for many years. The overall aim has been to find test methods that correspond with what happens in the road and that are easy to use in any road laboratory.
Following methods have been used in this investigation: planetarytype mixer for wear tests, freeze-thaw variation for weathering tests, Californian Bearing Ratio (CBR) for control of bearing capacity and impact value for control of blow resistance.
Gravel from different types of weak material from different parts of Sweden have been tested: schisty gravel, weathered gravel and different types of crushed rock.
Maximum wearing happens in wet conditions, therefore water has been added to the
materials during the above mentioned tests.
Increase in amount of fine material (less then 0.074 mm) after each test was checked and compared with the composition of the original material from each locality.
The investigation shows that different test methods detect different kinds of weakness in the investigated materials. E g freeze-thaw variation seems to give the best results for porous limestone, while the planetary-type mixer is a good standard of value for particularly schisty material. The latter method has however some disadvantages due to weak construction of the equipment. Consequently one test method doesn't seem to be enough to answer the questions about the weakness of gravel.},
  author       = {Markholm, Carl-Owe},
  keyword      = {bergkrossmaterial,naturgrus,geografi,geologi},
  language     = {swe},
  note         = {Student Paper},
  series       = {Examensarbeten i geologi vid Lunds universitet},
  title        = {Svagt naturgrus och bergkrossmaterial till bärlager : en laboratoriestudie},
  year         = {1986},
}