Investigation of relationships between AIMS shape properties and VST friction values.

Details

• Creators:
  Mahmoud, Enad ; Perales, Gabriela
• Corporate Creators:
  Illinois Center for Transportation
• Corporate Contributors:
  United States. Federal Highway Administration ; Illinois. Dept. of Transportation. Bureau of Materials and Physical Research
• Subject/TRT Terms:
  • Friction
  • Aggregates
  • Polishing (Aggregates)
  • Texture
  • Angularity
  • Cluster analysis
• Publication/ Report Number:
  FHWA-ICT-15-006 ; ICT-15-006 ; UILU-ENG-2015-2007
• Resource Type:
  Tech Report
• Geographical Coverage:
  Illinois
• Corporate Publisher:
  Illinois Center for Transportation
• Abstract:
  A thorough analysis was conducted for AIMS shape properties measured for virgin aggregates, aggregates ; polished in the Micro-Deval (MD) for 105 and 210 minutes, and VST friction samples. Excellent repeatability of ; AIMS angularity and texture measurements was observed. Investigating the relationships between AIMS-MD ; angularity and texture, a strong relationship was found between VST friction values and AIMS AMD-105 ; angularity and a combined angularity and texture of AIMS measurements also for AMD-105. This indicates that ; VST friction values are a function of both texture and angularity. Furthermore, the strong correlation between ; AIMS AMD-105 texture and the surface texture of VST friction samples indicated that MD is a viable option for ; replacing VST as a polishing mechanism and that current VST procedure might not be long enough to achieve ; terminal texture. Further analysis indicated that AIMS AMD-105 shape properties could potentially replace AMD- ; 210 for selecting and ranking aggregates for friction properties. However, the recommendation is to keep testing ; at both polishing intervals. Finally, clustering analysis was conducted to obtain threshold for classifying aggregate ; angularity and texture into acceptable and non-acceptable zones (i.e., defining the criteria for qualifying ; aggregates for friction purposes). In this study, two types of clustering were used: two-step cluster analysis and ; the K-means cluster analysis. The final outcome of this analysis was that an aggregate source with texture AMD- ; 105 > 140 and angularity AMD-105 > 1240 is recommended for friction purposes.
  More +
• Format:
  PDF
• Funding:
  R27-SP27
• Download URL:
  https://rosap.ntl.bts.gov/view/dot/28637/dot_28637_DS1.pdf
• File Type:
  [PDF - 761.20 KB]
• Collection(s):
  US Transportation Collection
• Main Document Checksum:
  urn:sha256:ea697e0fbb5c61c2281002d9840a54bc51fbea17e73a269603188c22c6c0ab2d