Research Update. Michael Heitzman, PE, PhD
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1 Research Update Michael Heitzman, PE, PhD
2 NCAT Pavement Test Track
3 New
4 2015 NCAT Pavement Test Track 4
5 Performance Data Parameter Track Lee Road 159 US-280 Roughness Weekly Weekly Weekly Rutting Weekly Weekly Weekly Macrotexture Weekly Weekly Weekly Crack Mapping Weekly Monthly+ Monthly+ FWD Weekly Monthly Quarterly Surface Friction Monthly Monthly Monthly Permeability Quarterly - Quarterly Noise Quarterly Quarterly Quarterly 5
6 Cracking Group (CG) Experiment
7 Southern Cracking Group (CG) N1-20% RAP Ctrl N2 - High Dens Ctrl N5 - Low AC & Dens Ctrl N8 Ctrl + 5% RAS S5 35% RAP w/ S6 Ctrl w/ HiMA S13-15% RAP AZ GTR. 7
8 Northern Cracking Group (CG) 8
9 Sponsor Oversight
10 2018 Research Cycle 10
11 Dr. R. Buzz Powell, PE Assistant Director & Test Track Manager 277 Technology Parkway Auburn, AL Phone: (334) Cell: (334) Web: Twitter: 11
12 Performance Curves for Pavement Preservation 12
13 Preservation Group Study GOAL: Develop independent life-extending benefit curves for a range of pavement preservation treatments, under varying traffic levels and climates 13
14 Treatments Control Sections Surface Treatments Crack Sealing Fog Seal Chip Seals Scrub Seals Microsurfacing Combinations (Cape Seals) Cold Recycling + 1 overlay Cold-in-place (CIR) Cold Central Plant Recycle (CCPR) Thin Overlays (3/4 ) Dense Graded (4.75 mm) OGFC UTBWC Combinations 14
15 Life Extending Benefit Life Extending Benefit 15
16 Test Subsections 16
17 Test Subsections Good: < 5% Fair: 5-20% Poor: > 20% 17
18 Performance Models S-shaped curves make the most sense Logistic growth models looks reasonable 18
19 Years in Good Condition = 5.2 Years in Good Condition vs Untreated = 4 Years to Poor Condition = 2.3 Years to Poor Condition vs Untreated =?
20 Years in Good Condition = 3 Years to Initial Condition = 4 Years to Poor Condition = 1 Years to Poor Condition vs Untreated =?
21 Years in Good Condition = 3 Years to Poor Condition = 5.4
22 Example Section Control (Untreated) CATEGORY Yr 4.8 % Crack Yr 4.8 Yrs in Good Yrs to Poor GOOD 31.3 POOR FAIR 44.5 POOR NA 1.0 POOR 94.3 POOR NA -- Section Single Chip Seal Single Chip Seal + Crack Seal CATEGORY Yr 4.8 % Crack Yr 4.8 Yrs in Good Yrs to Poor GOOD 10.3 FAIR FAIR 5.6 FAIR POOR 34.6 POOR GOOD 3.4 GOOD FAIR 15.6 FAIR POOR 17.3 FAIR
23 Most important Challenges How do we define life-extending benefit? 23
24 24
25 Asphalt Alternatives to High Friction Surface Treatments on the 2015 Track
26 Research Test Sections N9 OK DOT higher friction OGFC W3 FHWA higher friction SMA W7 FHWA higher friction micro-surfacing
27 N9 OK DOT OGFC Friction & Bond Strength Study Compared high friction aggregate sources with accelerated lab friction testing Compare Test Track friction performance with previous OK DOT Test Track Sections Compare tack coat performance
28 N9 OK DOT OGFC Feb 2016 July 2016 April 2017
29 N9 OK DOT OGFC Macro-texture CTM MPD 1.80 mm, rolling MTD 1.15 mm
30 N9 OK DOT OGFC 2015 N9 Sandstone vs 2012 E9 granite
31 N9 OK DOT OGFC Past OK mixes friction performance
32 W7 FHWA Micro-surfacing High Friction Alternative Study Compare friction performance of two micro-surfacing treatments using different friction aggregates Compare friction performance to HFST sections
33 W7 FHWA Micro-surfacing Mix Design by Paragon Technical Services India calcined bauxite source 50% bauxite, 49% LMS sand, 1% cement filler, 12% CSS-1HP (HiMA eflex) All aggregate passes #4 ASTM/ISSA mix design method
34 W7 FHWA Micro-surfacing
35 W7 FHWA Micro-surfacing Feb 2016 July 2016 Apr 2017
36 W3 FHWA SMA High Friction Alternative Study Measure friction performance of SMA with calcined bauxite as the predominant coarse aggregate Compare friction performance with HFST sections and previous W3 SMA Surface placed April 4, 2017
37 W3 FHWA SMA Final JMF Mar 2017, 4.75 mm NMAS, 50-blow Marshall, 40% India bauxite, 59% LMS M-10, 1% filler, 8.3% PG 76-22, 5% voids CA 50% = +No 16 (2:1 bauxite:lms)
38
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40 End-of-Cycle Track Conference High RAP/RAS balanced mix designs Nationwide pavement preservation Preventing reflective distresses Optimized structural design Implementation March 27-29,
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