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Florida Department of Transportation Pavement Performance Specifications Research.

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Presentation on theme: "Florida Department of Transportation Pavement Performance Specifications Research."— Presentation transcript:

1 Florida Department of Transportation Pavement Performance Specifications Research

2 Florida Department of Transportation FDOT: 5 million tons asphalt per year – Approximately $500 million – 300 construction projects 96% of pavements in Florida are asphalt – 93% of pavements in US are asphalt It’s 100% recyclable (RAP) Typical life-span in Florida is 17 years Asphalt Pavement Facts

3 Florida Department of Transportation Statewide Pavement Performance Section of Florida Statutes: “Ensuring that 80% of the pavement on the SHS meets Department Standards”

4 Florida Department of Transportation Statewide Pavement Performance

5 Florida Department of Transportation Deficient Roadways

6 Florida Department of Transportation Asphalt Specifications Update January 2013 – July 2014

7 Florida Department of Transportation Section 300 – Prime and Tack Coats – Approved NTSS-1hm (trackless tack) as prime coat – Tack all asphalt layers (clarification) January 2013 Workbook

8 Florida Department of Transportation Section 320 – Hot Mix Asphalt – Plant Methods and Equipment – No more viscosity testing of RAP every 5000 tons (Materials Memo 01-13) – Can use loaded aggregate trucks for scale checks. – Modified wording related to release agents; banning petroleum based products, not just “diesel fuel” January 2013 Workbook

9 Florida Department of Transportation Section 330 – Hot Mix Asphalt - General Construction Requirements – Eliminated mandatory requirement to perform QC rolling straightedge testing on friction course if final acceptance is by laser profiler – Can only mill out high straightedge deficiencies. No milling of “two highs” to fix a low deficiency January 2013 Workbook

10 Florida Department of Transportation January 2013 Workbook Section 334 – Superpave Asphalt Concrete – Lowered minimum overbuild thickness for SP-12.5 to ½” – Removed N initial requirements Table Asphalt Binder Grade for Mixes Containing RAP Percent RAPAsphalt Binder Grade PG PG >30PG 52-28

11 Florida Department of Transportation January 2013 Workbook Section 334 – Superpave Asphalt Concrete – No density testing if less than 50 tons of “density mix” in a sublot – No more pro-rating LOT pay factors by density required/no density required areas. Entire LOT gets pay factor unless entire LOT is no density required

12 Florida Department of Transportation January 2013 Workbook Section 916 – Bituminous Materials – Elimination of RA viscosity graded binders. Now all binders are PG graded – Removed RA-500, RA-750, RA-1000, RA-1500 and replaced with PG and PG – No longer using PG for HMA – Eliminated net total of three binders – Materials Memo issued to allow use on contracts let prior to January 2013

13 Florida Department of Transportation Section 234 – Superpave Asphalt Base – Can substitute a SP-12.5 Traffic Level D or E mixture in lieu of a Type B-12.5 mixture, not to exceed 500 tons for a project, at no extra cost to the Department, in limited situations if approved by the Engineer Section 320 – Hot Mix Asphalt – Plant Methods and Equipment – Cover and tie down all loads of friction course July 2013 Workbook

14 Florida Department of Transportation Section 330 – Hot Mix Asphalt - General Construction Requirements – Moved FC-5 temperature requirements from 337 to 330 July 2013 Workbook

15 Florida Department of Transportation Section 334 – Superpave Asphalt Concrete – Variable thickness overbuild layers constructed using a Type SP-9.5 or SP-12.5 mixtures may be tapered to zero thickness provided a minimum of 1-1/2 inches of dense-graded mix is placed over the variable thickness overbuild layer – Pavement Composition Report changed to Pavement Coring Report July 2013 Workbook

16 Florida Department of Transportation Section 336 – Asphalt Rubber Binder – Eliminated ARB-5 and ARB-12 Section 916 – Bituminous Materials – Addition of “PG (ARB)” to replace ARB-5 and ARB-12 – Requirements for “PG (ARB)”: Minimum 7% GTR. Certification Optional polymer modification, if needed Must meet the requirements for PG Additional “separation” requirement to minimize settlement July 2013 Workbook

17 Florida Department of Transportation Section 916 – Bituminous Materials – Previous PG with SBS polymer renamed to PG (PMA) – PG (PMA) added to standard specification – Implementation of Multiple Stress Creep Recovery (MSCR) tests for modified binders only – Polyphosphoric acid (PPA) may be used as a modifier not exceeding 1.25% by weight of asphalt binder July 2013 Workbook

18 Florida Department of Transportation Section 919 – Ground Tire Rubber – Modified gradation requirements (only max particle size; 98% passing no. 30 sieve) – Removed mandatory ambient grinding requirement – Changed maximum Rubber Hydrocarbon Content from 55% to 60% to reflect modern day tires July 2013 Workbook

19 Florida Department of Transportation Section 320 – Hot Mix Asphalt – Plant Methods and Equipment – Allows the first five loads of WMA to be produced at HMA temperature for purposes of heating the paver. Mix temperature not to exceed 330°F Section 330 – Hot Mix Asphalt - General Construction Requirements – Do not use diesel fuel or other petroleum based solvents contained in an open container for cleaning purposes on the paver January 2014 Workbook

20 Florida Department of Transportation Section 334 – Superpave Asphalt Concrete – Removed coarse graded mixtures – Increased maximum lift thickness of fine graded SP-19.0 mix type from 3" to 3-1/2" because coarse graded mixtures were removed Section 337 – Asphalt Concrete Friction Courses – Increased maximum possible design AC content for granite FC-5 mixtures from 7.0 to 7.5% January 2014 Workbook

21 Florida Department of Transportation Section 916 – Bituminous Materials – Added a statement that excess PG (ARB) could be mixed with unmodified binder under the conditions outlined in the specification January 2014 Workbook

22 Florida Department of Transportation Section Prime and Tack Coats – Removed cut-back prime coats and emulsion grades not being used any more – Added two new trackless tack products Section 320 – Hot Mix Asphalt – Plant Methods and Equipment – Added language "For warm mix asphalt, the Contractor may produce the first five loads of the production day and at other times when approved by the Engineer, at a hot mix asphalt temperature not to exceed 330°F for purposes of heating the asphalt paver July 2014 Workbook

23 Florida Department of Transportation Section 334 – Superpave Asphalt Concrete – Added clarification for SP-19.0 mixtures: "Type SP May not be used in the final (top) structural layer below FC-5 mixtures. Type SP-19.0 mixtures are permissible in the layer directly below FC-9.5 and FC-12.5 mixtures." – Set time limit of 60 days for how long a LOT can be left open. July 2014 Workbook

24 Florida Department of Transportation Section 916 – Bituminous Materials – Removed cut-backs, some emulsions, and added trackless tacks – Emulsions now approved and monitored like binders. Added to the QPL. – For PG (ARB), provide a certification statement on the product evaluation application and in the Quality Control Program that a minimum of 7.0% GTR is used in the formulation of the binder. July 2014 Workbook

25 Florida Department of Transportation Hot Topics & Research Notables

26 Florida Department of Transportation NCAT Test Track 20” of asphalt base  insures all failures are in the top 4” asphalt structural layers. One truck = six fully loaded 18- wheelers (152,000 lbs.) Five trucks are operational at one time. ≈ 45 mph. Load 5 AM to 11 PM. Two shifts per day. 340 miles per driver per day. 6 days per week. 3 year research cycle – 10 million ESALs applied over two years. (10.36 ESALs per pass) – Forensics and reconstruction on 3rd year.

27 Florida Department of Transportation NCAT Test Track – Fine vs. Coarse (PG ) – Continuation of 2000 cycle – PG vs. PG Validation of SMO HVS – Validation of Energy Ratio – Bonded Friction Course – Thick tack coats – Polymer vs. Rubber – High RAP vs. Shingles

28 Florida Department of Transportation Traditionally FDOT has focused on milling and resurfacing Higher traffic volume roadways Goal: Get in, get out, stay out… Pavement Preservation

29 Florida Department of Transportation Hot-In-Place RecyclingMicrosurfacing Crack Sealing Fog Seal FDOT LOOKING AT ALTERNATIVES…

30 Florida Department of Transportation 12 projects * constructed to date: – 11 as “Reworked Asphalt” – 1 as “Repaved Asphalt” Every district except for Turnpike Earliest project * 2001 Four projects completed in 2012 * “Modern” Era HOT IN-PLACE RECYCLING

31 Florida Department of Transportation First FDOT microsurfacing project: – US-319 Leon County – 2010 Worked with several Contractors & Suppliers on specification – Based on ISSA requirements ISSA Type II mixture gradation Spread rate 20 – 26 lbs/sy – Single course Required crack sealing MICROSURFACING

32 Florida Department of Transportation Five Crack Seal Test Decks were placed in March 2012 – Leon, Baker, Sumter, DeSoto, and Miami-Dade Counties Several materials and construction techniques evaluated Performance will be monitored for three to five years Crack Sealing

33 Florida Department of Transportation Placed in 2013 US-27 & US-17 Polk County Placed on OGFC – Attempt to reduce raveling & top-down cracking – Age: 4 years old – Good condition Multiple Test Sections Multiple Products Fog Sealing Test Sections

34 Florida Department of Transportation US-98 Gulf County – Constructed 2012 Ten Test Sections: 1.Control Section 2.Micro-surfacing (Double course) 3.1/2” HMA overlays with 4.75 mm mix 4.3/4” HMA overlays with 4.75 mm mix 5.1” HMA overlay with 9.5 mm mix 6.Hot-in-place recycling 7.Bonded open graded friction course 8.Mill and resurface 1.0” with 9.5 mm mix 9.Mill and resurface 1.5” with 12.5 mm mix 10.Control section Pavement Preservation Test Sections

35 Florida Department of Transportation Recycling Program

36 Florida Department of Transportation RAP Data ConditionsFY 10/11 FY 11/12 FY 12/13 FY 13/14 Unrestricted (No Maximum Limit) Average25%26%25% Maximum40%38%39%41% Restricted (Maximum 20%) Average17%18%16%15% Maximum20%

37 Florida Department of Transportation National Hot Topic FDOT pilot projects 0.85 Binder Availability Issues with the unknown RAS

38 Florida Department of Transportation NCAT: HIGH RAP VERSUS RAP/RAS PG (PMA) with 25% RAP PG (PMA) with 20% RAP & 5% RAS

39 Florida Department of Transportation January 2012 specification Texture Meter Pave-IR System Pavement Segregation

40 Florida Department of Transportation Pave-IR Demo Oct / Turnpike, Palm Beach Equipment: MOBA Pave-IR To detect Thermal Segregation

41 Florida Department of Transportation Bonded Friction Course Conventional Trackless UltraFuse eTac

42 Florida Department of Transportation New Flow Number (FN) Test: iRLPD Hydrated Lime Study Volumetric refinement Alternative technique(s) to mitigate reflective cracking RAP with Dense-graded FC Evaluation of FL mixes for crack resistance using Overlay Tester Binder Rejuvenators Optimization of FC-5 characteristics Field test method to detect Polymer and/or GTR Performance Specification for Tack – Bond Strength FC-5 image analysis for determination of optimum binder content Understanding mechanisms of OGFC raveling Other Research

43 Florida Department of Transportation QUESTIONS/ COMMENTS? THANK YOU!


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