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Bituminous Stabilized Materials: Structural Design and Materials Classification

Bituminous Stabilized Materials: Structural Design and Materials Classification. RPF November 2007 Fenella Long. Today’s Presentation. Demonstrate the software for Pavement design method Materials classification method Review process. Software. www.bitstab.roadrehab.com

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Bituminous Stabilized Materials: Structural Design and Materials Classification

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  1. Bituminous Stabilized Materials:Structural Design and Materials Classification RPF November 2007 Fenella Long

  2. Today’s Presentation • Demonstrate the software for • Pavement design method • Materials classification method • Review process

  3. Software • www.bitstab.roadrehab.com • Software runs on website • Background info • Descriptions • Download backup reports

  4. Example

  5. Materials Classification • Rational and consistent method of assigning materials to a class • Example

  6. Review Process • Need industry representatives to review – YES YOU • Structural design method • Approach to material classification • Material class limits • “Reasonableness” of results

  7. 6. Calculate Layer ELTS Values ELTS = 450 BCF = 0.7 150 mm BSM2 MR = 2, EMax = 450 ELTS = 400 Thickness Adj = 0.4 200 mm C4 MR = 3, EMax = 400 ELTS = min(212,180) ELTS = 180 180 mm G6 MR = 1.8, EMax = 180 118 MPa 118 MPa 150 mm G7 6. ELTS = min (Esupport * MR , Emax) Example, Moderate Region 5. Assign modular ratio’s and max stiffness 1. Material Classes CBR 7-15% 2. Determine subgrade stiffness (140 MPa) 3. Adjust for climate (126 MPa) 4. Adjust for cover (118 MPa) 7. Layer PN = thickness * ELTS 8. PN =  layer PN

  8. Relative certainty that material is a G2, based on this test Median Value 90th Percentile Value 10th Percentile Value Assigning Material Class Confidence for Specific Indicators G2 G3 G4 e.g. DCP

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