Roadway Designer Resurfacing Restoration and Rehabilitation

1. Roadway Designer Resurfacing Restoration and Rehabilitation Kevin Jackson, Technical Director, TLI Bentley Systems, Inc.

2. Roadway Designer Overlay Tools

3. Objectives – Overlay Components

4. Overlay Tools – Overlay / Stripping Components

5. Top Option Bottom Option Follow Surface Follow Component Add New Component > Overlay/Stripping

6. Overlay Component

7. Create Pave + Overlay Template • Drag the Overlay_Only template into it so that the bottom of pavement and Overlay points merge. • Test • Run Roadway Designer • Change to Pave+Overlay template • Note that Overlay now extends full width

8. Stripping Component

9. Create a Pavement+Overlay template • Add a Milling Component • Match the bottom three points • Test • Create a Pavement + Overlay + Milling Component • Run Roadway Designer

10. Multiple Layers • Different Overlay Layers? • Use Follow Lowest / Follow Highest

11. Review the 05_OverMill_Complicated Corridor (multiple overlay layers, saddlebags, quantities)

12. Component Quantities • Standard: End-Area Volume Reports • Quick: Component Quantities • Provides Component Quantities and Costs • Not exact: good for quickly comparing alternatives • For “complete” quantities use the full End-Area Volumes functionality

13. Run Roadway Designer • Launch Component Quantities • Walk the Corridor • Disable Parametric Constraints

14. Milling Report • Reports on Overlay/Stripping components that have the Stripping option set. • Milling Stylesheet (set Default)

15. Generate a Milling Report

16. Overlay Tools – Vertical Adjustments

17. Vertical Adjustment Scenarios • Overlay • Overlay + Max Milling • Min. Milling w/ & w/o Max. Milling

18. Vertical Adjustments: the Engineering • Structural Integrity of new Backbone • Minimum amount of overlay material (minimum overall overlay thickness) • Full-width Milling • Milling: maximum depth of high-point milling

19. Vertical Adjustments: the Methodology • Given a template, it determines the Template Top. • This is the triangulated surface • Regardless of the complexity of the template, the Top is a simple left-to-right linestring • It compares the vertices in the Top to the vertices in the Active Surface • It finds the Minimum (or Maximum) Vertical Difference value • It adds the Backbone Thickness, Overlay and/or Milling values to determine an Adjustment Value. • Adjustment is completely independent of anything other than the Top line and the Surface

20. Template Top • Determined from Top segments in the template • Everything under the top ignored • The Backbone Thickness is used in Adjustments

21. Vertical Adjustments Horizontal Range • Horizontal Range of Comparison must be defined • Template Top • User Selects Two Template Points to define the left and right ends • Existing Ground Range • Use the Template Points used for the Top • Or - Follow Alignments, Features or Styles • Or - Fixed Offsets

22. Vertical Adjustments Comparisons • Solution Options • Compare at Template Points Only or at all Section Points • Maximum Difference can be set

23. Critical Points and Vertical Delta • Only Two Comparison Points/Vertical Deltas matter: • Zero Overlay Point and Minimum Milling Point

24. Vertical Adjustment Geometry • Critical Point = • Min. Milling Point for Min. Milling • Zero Overlay Point for Overlay • Critical Delta = • Existing Surface Elev. - Template Top Elev. at the Critical Point • Direction matters • + is up, - is down

25. Minimum Milling • Top is moved to the lowest position where it intersects the existing surface • Establishes “Bottom” of backbone

26. Backbone Thickness • Backbone Thickness (always positive) is added to the (positive or negative) Min. Milling Delta • Adjustment = Min. Milling Delta + Backbone Thickness

27. In Roadway Designer select the 02_Pavement* Corridor • Select Display Mode: Overlay • Vertical Adjustments: • Set Template & ex Ground Range • Select Use Minimum Milling • Walk the Corridor, observe

28. Minimum Overlay • Step 1: Find the Minimum Overlay point: the intersection between the top and the existing ground where the Top is highest

29. Overlay Settings • Minimum Overlay Value • Between Backbone Bottom and high point of existing (Minimum/Zero Overlay Point) • Zero or greater • Added to Adjustment

30. Minimum Overlay • Steps 2 and 3: Add the Minimum Overlay Value to the Zero Overlay Delta and add the Backbone Thickness

31. In Roadway Designer select the 02_Pavement* Corridor • Select Display Mode: Overlay • Vertical Adjustments: • Set Template & ex Ground Range • BB=0, Min Overlay = 0 • Walk the Corridor, observe

32. Change the Backbone Thickness to 0.2 ft [0.1m] • Walk the Corridor, observe • Change the Minimum Overlay to 0.2 ft [0.1m] • Walk the Corridor, observe

33. Minimum Milling with Maximum Milling • Sets a maximum limit to milling • Milling is limited to • Maximum Milling Valueor • Minimum Milling Point (full-width milling)

34. Set to Minimum Milling • Select the Maximum Milling option • Key in 0.1 [0.05] • Walk the Corridor, observe

35. Minimum Overlay with Max Milling • Mills out High Points • Requires less Overlay Material than with no milling • Can save significant money

36. Minimum Overlay with Max Milling • Milling Adjustment value is the last adjustment • Total Adjustment is never negative • Milling Adjustment is limited by • The Max Milling Value or • Zero Adjustment point

37. Change the Maximum Milling depth to 0.1 [0.05] • Walk the Corridor, observe • Change the Corridor Vertical to None • Walk the Corridor, observe

38. Vertical Alignments • Vertical Adjustments do not require vertical alignments • Components behave the same regardless of how they’re controlled vertically. • To “Permanently Save” the Adjustments you’ll need to make an Alignment: • Smooth Adjusted Vertical Alignment • Apply Adjusted Vertical Alignment • Final Cleanup: can use standard alignment tools

39. Smooth the Vertical Adjustment • Save the Vertical • envelopes • Review the Vertical • Push the Corridor w/o Adjustments (go w/ adj. to see if the Adjustment deviates from 0.0) • If different: verify that the Adjustment settings were the same