2015 ACEC HMA Update. Kevin Kennedy HMA Operations Engineer Michigan Department of Transportation

Transcription

1 2015 ACEC HMA Update Kevin Kennedy HMA Operations Engineer Michigan Department of Transportation

2 Hot Mix Asphalt (HMA) Update Acceptance of HMA on Local Agency Projects HMA Quality Improvements Recycled Tire Rubber Permissive Specification Miscellaneous Specification Changes HMA Production Manual National Peer Review

3 Acceptance of HMA on Local Agency Projects Specification in Approval Process Covers Roller Method and Density Testing with Nuclear Gauge Revises Tolerance Limits and Penalty Structure for HMA Mixtures Strengthens Sampling and Testing Requirements Adds Time Frame for Reporting Quality Assurance Test Results

4 Local Agency Tolerance Limits Table 1 Uniformity Tolerance Limits for HMA Parameter Top and Leveling Course Base Course Number Description Range 1 (a) Range 2 Range 1 (a) Range 2 1 % Binder Content to ± to ±0.50 # 8 and Larger Sieves ±5.0 ±8.0 ±7.0 ±9.0 2 % Passing # 30 Sieve ±4.0 ±6.0 ±6.0 ±9.0 # 200 Sieve ±1.0 ±2.0 ±2.0 ±3.0 3 Crushed Particle Content (b) Below 10% Below 15% Below 10% Below 15% a. This range allows for normal mixture and testing variations. The mixture must be proportioned to test as closely as possible to the Job-Mix-Formula. b. Deviation from Job-Mix-Formula.

5 Acceptance of HMA on Local Agency Projects Sampling and Testing Requirements All persons performing testing must be Bituminous (Bit) Level One certified or Bit Quality Assurance/Quality Control (QA/QC) Technician certified. All laboratories performing local acceptance testing must be qualified laboratories. o Qualified per the HMA Production Manual and participate in the MDOT Round Robin process o or Laboratory must be AASHTO Materials Reference Laboratory (AMRL) accredited for AASHTO T 30 or T 27, and AASHTO T 164 or T 308. Contractor Laboratories: o Non NHS: Allowed o NHS: Not Allowed

6 Acceptance of HMA on Local Agency Projects Sampling and Testing Requirements Qualified Samplers Required o Qualifying of Samplers to be handled by Ferris State University o MTM 313 (Sampling HMA Paving Mixtures) o MTM 324 (Sampling HMA Paving Mixtures Behind the Paver) Minimum Obtain and test two samples per day (no longer testing at frequency determined by engineer) Quality Assurance Test Results Time Requirement o 7 days projects more than 5000 tons o 14 days projects less than 5000 tons

7 Acceptance of HMA on Local Agency Projects Penalty Structure Table 3: Penalty Per Parameter Mixture Parameter out-of-specification per Acceptance Tests Mixture Parameter out-ofspecification per Dispute Resolution Test Lab Price Adjustment per Parameter NO N/A None YES NO YES None Outside Range 1 but not Range 2: decrease by 10% Outside Range 2: decrease by 25% Out of specification 2 consecutive tests outside of range 1 or range 2

8 Acceptance of HMA on Local Agency Projects Density Testing Two Options o Direct Density Method Nuclear density gauge percent of density control target (Gmm from JMF) o Roller Method Added table for Minimum Number of Rollers Recommended Based on Placement Rate Added table for Density Frequency Curve Development. Timing o During paving operations o Prior to traffic staging changes o Prior to subsequent lifts and opening to traffic

9 Acceptance of HMA on Local Agency Projects Additional Significant Changes Regress air voids in production to 3.5% Dispute Process o Range 1 Independent Laboratory o Range 2 Construction Field Services HMA laboratory (MDOT Central Laboratory)

10 Acceptance of HMA on Local Agency Projects Future Changes Move towards volumetric testing Air Voids, VMA,?? Doesn t Necessarily Mean SuperPave Sampling Behind the Paver/ Mini Stockpile

11 HMA Quality Improvements Regress Mixes to 3% Air Voids Requiring Fine Graded or Gap Graded for Top Courses Ride Quality Incentive

12 Quality Regress High Volume Mixes Regress Mixes to 3% Air Voids in Production for E10, E30 and E50 Mixes Effective October Letting Table 3 For mixtures meeting the definition for top and leveling courses: Mixtures must be designed to 96.0% of Maximum Specific Gravity (%Gmm) at the design number of gyrations, (Nd). During field production Percent of Maximum Specific Gravity (%Gmm) at the design number of gyrations, (Nd) will be increased to 97.0% for E10, E30, & E50 mixes. For all other mixes, Percent of Maximum Specific Gravity (%Gmm) at the design number of gyrations, (Nd) will be increased to 96.5% during field production.

13 Quality Regress All Mixes Regress Mixes to 3% Air Voids in Production For All Mixes Effective March Letting Unless noted otherwise on the plans, all mixtures must be designed to 96.0% of Maximum Specific Gravity (%G mm ) at the design number of gyrations, (N d ). During field production Percent of Maximum Specific Gravity (%G mm ) at the design number of gyrations, (N d ) will be increased to 97.0%.

14 Quality Regress All Mixes Additional Changes Changing the upper air voids limit on single test acceptance (changed to 2.0 from 2.5) Changing suspension limits in Table 4 for binder content (changed from 1.00 to 0.75) Changing the sublot Rejectable Quality Limits (RQL) for air voids (changed to +2, 1.5 from +2, 2) Adding removal limits for lots on one course overlays (501V)

15 Quality Regress All Mixes Table 4 Col. I Quality Characteristic Col. II QC Action Limits (a) Col. III QC Suspension Limits (b) Col. IV QA Suspension Limits Form 1165 (a) Col. V Sublot RQL Form 1165 (c) Col. VI Lot AQL (d) Col. VII Lot RQL (d) Aggregate Gradation (optional) Aggregate Moisture Binder Content ± 0.50 JMF ±0.75 JMF PWL BINDER 90 For any lot PWL BINDER < 50 For any lot Combined Mixture Gradation Defined in the HMA QC Plan Refer to Table 2 Maximum Theoretical Specific Gravity ± JMF ± JMF Bulk Specific Gravity Volumetrics: Air Voids Defined In the HMA QC Plan ± 1.00 of Target Air Voids , 1.50 of Target Air voids PWL AV 90 For any lot PWL AV < 50 For any lot Volumetrics: VMA Defined In the HMA QC Plan ±1.00 of VMA Targets in Table 3 ±2.00 of VMA Targets in Table 3 PWL VMA 90 For any lot PWL VMA < 50 For any lot Fines to Effective Binder Defined In the HMA QC Plan (a) In Place Density Defined in the HMA QC Plan Defined in the HMA QC Plan Average Sublot Value < 90.00% a. Limits apply to two consecutive QC or QA tests. b. Limits apply to single QC tests. c. Specified. Limits apply to a single QA sublot Air Void or VMA test or on the sublot average In Place Density. d. Specified. Limits apply on a lot by lot basis. Based on QA results for the lot. PWL D 90 For any lot PWLD < 50 For any lot

16 Quality Fine Graded/Gap Graded on Top Course Changed Gradation to Eliminate Coarse Graded Mixes Eliminated Restricted Zone FUSP 902E Effective January Letting Revises Table and 902 6

17 Quality Fine Graded/Gap Graded on Top Course Revised Table Superpave Final Aggregate Blend Gradation Requirements Percent Passing Criteria (control points) Mixture Number 3 Leveling 3 Base Course Standard Sieve 5 4 Course 2 LVSP (a) 1½ in 100 1in ¾in ½in ⅜ in No No No No No No No a. For LVSP, less than 50 percent of the material passing the No. 4 sieve may pass the No. 30 sieve.

18 Quality Fine Graded/Gap Graded on Top Course Est. Traffic (million ESAL) Mix Type Percent Crushed Minimum Criteria Top & Leveling Courses Base Course Revised Table Superpave Final Aggregate Blend Physical Requirements Fine Aggregate Angularity Minimum Criteria Top & Leveling Courses Base Course % Sand Equivalent Minimum Criteria Top & Leveling Courses Base Course Los Angeles Abrasion % Loss Minimum Criteria Top & Leveling Courses Base Course % Soft Particles Maximum Criteria (a) Top & Leveling Courses Base Course % Flat and Elongated Particles Maximum Criteria (b) Top & Leveling Courses < 0.3 LVSP 55/ < 0.3 E03 55/ >0.3 -<1.0 E1 65/ >1.0 - < 3 E3 75/ 50/ >3 - <10 E10 85/80 60/ >10 - <30 E30 95/90 80/ >30 - <100 E50 100/100 95/ (a) Soft particles maximum is the sum of the shale, siltstone, ochre, coal, clay-ironstone and particles that are structurally weak or are non-durable in service. (b) Maximum by weight with a 1 to 5 aspect ratio. Note: 85/80 denotes that 85 percent of the coarse aggregate has one fractured face and 80 percent has at least two fractured faces. Base Course

19 Quality Ride Quality Incentive Specification in Approval Process Incentive Starts at IRI of 45 Increases to $.50 per square yard at IRI of 25 Applies to High Speed Roads (50 MPH) Class I and Class II Roads per Ride Quality Specification

20 Recycled Tire Rubber Grand Region Pilot Project 2013 M 57 from East of Northland Drive to West of Morgan Mills Avenue Crumb rubber portion approximately 3.2 miles on M 57 between Wabasis Road and Morgan Mills Allowed Wet Process or Terminal Blend (contractor s option) Three binders (64 22, 70 22P, crumb rubber modified) 6,007 tons HMA 5E3 Crumb Rubber Modified Bids Low Bidder $79.45 vs $ nd Bidder $71.15 vs $102.97

21 MDOT Pilot Project

22 Recycled Tire Rubber HMA Tech Committee Directed to Develop Permissive Specification o Originally specification to mirror pilot project o Concern over reports of poor performance (Waverly Road, Haslett Road, various Saginaw County projects) o PG Binder performance tests have been modified or waived o HMA Technical Committee believes revised tests do not accurately predict performance o No deviations to acceptance test methods/procedures allowed.

23 Waverly Road 2011 Construction County Road (Photo taken in 2013)

24 Miscellaneous Specification Changes FUSP 501G (RAP/RAS) Added language referring to production manual for blending charts: When incorporating RAS the asphalt binder grade will be selected using a blending chart for high and low temperatures. The Contractor must supply the blending chart used in determining the binder selection according to AASHTO M 323 and the HMA Production Manual. FUSP 501L (Temp Pavement) Added language clarifying removal of temporary pavement is not part of temporary pavement pay item

25 Miscellaneous Specification Changes Gap Graded SuperPave New specification for ½ nominal mix and 3/8 nominal mix FUSP 504C (HMA ultra thin overlay) New specification, no longer Marshall mix. Includes mix design submittal requirements HMA Binders Changes coming to Price Adjustment and Certification Procedures

26 HMA Production Manual Bureau of Highway Instructional Memorandum o Includes blending chart instructions for RAP/RAS. o RAP now part of mix design submittal. o Section 4 was removed from the MDOT HMA Production Manual and added to Section of the MDOT Materials Quality Assurance Procedures Manual (MDOT MQAPM).

27 NCAT/NAPA/FHWA National Peer Review Starting in Spring/Early Summer Best Practices o Construction (Tack Coat Application, Joint Construction, Minimizing Segregation) o Mix Design o RAP/RAS o Local Agency Acceptance

28 Good Government In Action Good Government In Action (GGIA) o Adoption of methods to make strategically important changes o Focus on closing performance gaps for anything strategically important o Customer satisfaction is the primary goal for 2013 & 2014 Hot Mix Asphalt (HMA) Operations Wildly Important Goal (WIG) o 2013 Focus on dispute resolution turn around time o 2014 Focus on binder sampling and testing

29 Questions? Kevin Kennedy HMA Operations Engineer