Development of a model for the ice scraping process.

Details

• Creators:
  Nixon, W.A. ; Gawronski, T.J. ; Whelan, A.E.
• Corporate Creators:
  Iowa Institute of Hydraulic Research
• Corporate Contributors:
  Iowa. Dept. of Transportation
• Subject/TRT Terms:
  • Snow and ice control
  • Deicing
  • Snow removal
  • Anti-icing
  • Machinery
  • Maintenance
  • Roads--Snow and ice control--Equipment and supplies--Testing
  • Road machinery--Testing
  • Roads--Maintenance and repair--Equipment and supplies--Testing
• Publication/ Report Number:
  IIHR Technical Report No. 383
• Resource Type:
  Tech Report
• Geographical Coverage:
  Iowa
• Edition:
  Final report.
• Corporate Publisher:
  Iowa Institute of Hydraulic Research
• Abstract:
  A laboratory study has been conducted with two aims in mind. The first goal was ; to develop a description of how a cutting edge scrapes ice from the road surface. The ; second goal was to investigate the extent, if any, to which serrated blades were better than ; un-serrated or "classical" blades at ice removal. ; The tests were conducted in the Ice Research Laboratory at the Iowa Institute of ; Hydraulic Research of the University of Iowa. A specialized testing machine, with a ; hydraulic ram capable of attaining scraping velocities of up to 30 m.p.h. was used in the ; testing. ; In order to determine the ice scraping process, the effects of scraping velocity, ice ; thickness, and blade geometry on the ice scraping forces were determined. Higher ice ; thickness lead to greater ice chipping (as opposed to pulverization at lower thicknesses) ; and thus lower loads. S~milabr ehavior was observed at higher velocities. The study of ; blade geometry included the effect of rake angle, clearance angle, and flat width. The ; latter were found to be particularly important in developing a clear picture of the scraping ; process. As clearance angle decreases and flat width increases, the scraping loads show a ; marked increase, due to the need to re-compress pulverized ice fragments. ; The effect of serrations was to decrease the scraping forces. However, for the ; coarsest serrated blades (with the widest teeth and gaps) the quantity of ice removed was ; significantly less than for a classical blade. Finer serrations appear to be able to match the ; ice removal of classical blades at lower scraping loads. Thus, one of the ; recommendations of this study is to examine the use of serrated blades in the field. ; Preliminary work (by Nixon and Potter, 1996) suggests such work will be fruitful. ; A second and perhaps more challenging result of the study is that chipping of ice ; is more preferable to pulverization of the ice. How such chipping can be forced to occur ; is at present an open question.
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• Format:
  PDF
• Download URL:
  https://rosap.ntl.bts.gov/view/dot/23346/dot_23346_DS1.pdf
• File Type:
  [PDF - 1.43 MB]
• Collection(s):
  US Transportation Collection
• Main Document Checksum:
  urn:sha-512:587c72b0302204462362ef43c9c43ab682b6f44731878534b81afb5829f0f007c7f9df7c63751f5de112d4c893d1b16991017ae79fc6f099d6864b9c023b5d45