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RPF - May 2008

RPF - May 2008. Task Group: Seal Design Input Parameters. D Rossmann. Seal Design input parameters. Texture depth Expected embedment (ball penetration). Seal Design input parameters. Meaningful Result: Correct “ sampling ” Standard test method Correct interpretation of results.

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RPF - May 2008

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  1. RPF - May 2008 Task Group: Seal Design Input Parameters D Rossmann

  2. Seal Design input parameters • Texture depth • Expected embedment (ball penetration)

  3. Seal Design input parameters Meaningful Result: • Correct “sampling” • Standard test method • Correct interpretation of results

  4. Seal Design Input Parameters Correct Sampling: Seal designer VS “Commercial” laboratory technician!!!

  5. Seal Design input parameters Test Methods • Texture depth and ball penetration = TMH 6 (1984) • Texture depth and ball penetration = SANS (in progress)

  6. Seal Design input parameters Testing • Recommended K-factors 0,04 mm/oC – seals (not fatty) 0,05 mm/oC – slurry seals (not fatty) 0,07 mm/oC – cape seals (not fatty) 0,04 mm/oC – fatty roads and HMA surfacings ??? • Granular or cemented bases? • 19mm ball irrespective of aggregate size?

  7. Seal Design input parameters Interpretation of results • Embedment! • Crushing! • Displacement!

  8. Texture Depth (Sand patch) • 500 ml sand • Box, squeegee, hand • Wheel track and in-between

  9. Seal Design input parameters SANS (TMH)/TRH 3 Relationships Sampling - SANS! Testing Interpretation – TRH3?

  10. Conclusion • Seal designer/laboratory relationship (does the tester know what to do???) • Beware of “black box” approach

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