Incorporating Lab Skid Measurements into the Balanced Mix Design Process
Texas Department of Transportation (TxDOT) research developed the Balanced Mix Design (BMD) concept around 2005 where the conflicting mix properties of rutting and cracking are measured using laboratory tests and a binder type and content selected which provides satisfactory results for both requirements. The next and final stage of the BMD development is to incorporate a defensible and practical laboratory assessment of skid resistance into the process. TxDOT has been conducting research on predicting skid resistance for over 5 decades. This research has focused on measuring the polishing resistance of the coarse aggregate portion of mixes. This has led to the development of a surface aggregate classification where the SAC A materials are rated as having good skid resistance properties. However recently it is reported that some mixes with predominantly SAC A materials have low skid resistance. In addition some of the fine surface mix with little coarse aggregate have been shown to have excellent skid resistance. One conclusion is that the long-term skid resistance of any surface mix is a function of many factors including mix, type, gradation, the quality of the fines used, and others not simply coarse aggregate properties. It is proposed that a laboratory test procedure needs to be developed and implemented to measure skid resistance of the proposed mix. This test will eventually be incorporated into TxDOT's BMD.
Language
- English
Project
- Status: Active
- Funding: $688699
-
Contract Numbers:
0-7212
-
Sponsor Organizations:
Texas Department of Transportation
125 E. 11th Street
Austin, TX United States 78701-2483 -
Project Managers:
Dassi, Martin
-
Performing Organizations:
Texas A&M Transportation Institute
Texas A&M University System
3135 TAMU
College Station, TX United States 77843-3135The University of Texas at Tyler
3900 University Blvd
Tyler, TX United States 75799 -
Principal Investigators:
Goehl, Darlene
- Start Date: 20241018
- Expected Completion Date: 20270831
- Actual Completion Date: 0
Subject/Index Terms
- TRT Terms: Aggregates; Laboratory tests; Mix design; Skid resistance; Test procedures
- Subject Areas: Design; Highways; Materials; Pavements;
Filing Info
- Accession Number: 01935542
- Record Type: Research project
- Source Agency: Texas Department of Transportation
- Contract Numbers: 0-7212
- Files: RIP, STATEDOT
- Created Date: Oct 30 2024 3:02PM