Review of TxDOT WWARP Aggregate Classification System

This report documents the findings from a research study that reviewed the Texas Department of Transportation's (TxDOT’s) Wet Weather Skid Accident Reduction Program’s (WWARP’s) aggregate classification system. It evaluated various lab test procedures that are used in the classification of aggregates as well as the field skid resistance performance of 27 different aggregate sources that belonged to synthetic, sandstone, igneous, gravel and carbonate categories. The findings showed that hard, durable aggregates characterized by >80% AIR or <8% MD losses, provided excellent to very good skid resistance regardless of the aggregate residual polish value. In general, all test methods evaluated showed better capability in separating excellent/very good quality aggregates than in identifying very poor/poor quality aggregates. In other words, the special limitation in these test methods was found to be in their ability to classify borderline aggregates into satisfactory and unsatisfactory categories. The WWARP aggregate classification system based on Residual PV, MSS loss and AIR proved to be effective in separating Excellent/Very Good (Class A) from Good/Fair (Class B) materials. However, this classification system failed to separate the few aggregate sources with poor field performance from those with good/fair performance.

• Record URL:
  https://library.ctr.utexas.edu/digitized/texasarchive/phase2/1707-8.pdf
• 
• Supplemental Notes:
  • Project Title: Long-Term Research on Bituminous Coarse Aggregate. Report Date: February 2008; Revised: November 2008.
• Corporate Authors:

  Texas Tech University, Lubbock

  Department of Civil and Environmental Engineering
  P.O. Box 41023
  Lubbock, TX  United States  79409-1023

  Texas Department of Transportation

  Research and Technology Implementation Office, P.O. Box 5080
  Austin, TX  United States  78763-5080

  Federal Highway Administration

  1200 New Jersey Avenue, SE
  Washington, DC  United States  20590
• Authors:
  • Jayawickrama, Priyantha Warnasuriya
  • Madhira, Pavan
• Publication Date: 2008-11

Language

• English

Media Info

• Media Type: Web
• Edition: Technical Report
• Features: Figures; Photos; References; Tables;
• Pagination: 108p

Subject/Index Terms

• TRT Terms: Aggregates; Artificial aggregates; Carbonate rocks; Classification; Gravel; Igneous rocks; Laboratory tests; Polished stone value test; Sandstones; Skid resistance tests
• Uncontrolled Terms: Acid insoluble residue; Magnesium sulfate soundness test; Micro-Deval test
• Subject Areas: Highways; Materials; I36: Aggregates;

Filing Info

• Accession Number: 01129960
• Record Type: Publication
• Report/Paper Numbers: FHWA/TX-08/0-1707-8, Report No. 0-1707-8
• Contract Numbers: 0-1707
• Files: TRIS, USDOT, STATEDOT
• Created Date: Jun 10 2009 4:49PM