superpave today kenneth ray hobson, p.e. –bituminous engineer [email protected] city of tulsa may...
TRANSCRIPT
![Page 1: Superpave Today Kenneth Ray Hobson, P.E. –Bituminous Engineer khobson@odot.org City of Tulsa May 13, 2011](https://reader034.vdocuments.us/reader034/viewer/2022051400/551570ed55034674578b4fcf/html5/thumbnails/1.jpg)
Superpave Superpave TodayToday
Kenneth Ray Hobson, P.E. –Kenneth Ray Hobson, P.E. – Bituminous Bituminous EngineerEngineer
[email protected]@odot.org
City of TulsaMay 13, 2011
![Page 2: Superpave Today Kenneth Ray Hobson, P.E. –Bituminous Engineer khobson@odot.org City of Tulsa May 13, 2011](https://reader034.vdocuments.us/reader034/viewer/2022051400/551570ed55034674578b4fcf/html5/thumbnails/2.jpg)
OverviewOverview• Asphalt Mix Design Methods• Laboratory Mixture Compactors• Asphalt Binders• Aggregate Tests• Mix Design Proof Testing• Design by Traffic Volume
![Page 3: Superpave Today Kenneth Ray Hobson, P.E. –Bituminous Engineer khobson@odot.org City of Tulsa May 13, 2011](https://reader034.vdocuments.us/reader034/viewer/2022051400/551570ed55034674578b4fcf/html5/thumbnails/3.jpg)
OverviewOverview• Mix Design Notes• Future Items of Note• 2009 Std. Spec. 411• Links Of Note
![Page 4: Superpave Today Kenneth Ray Hobson, P.E. –Bituminous Engineer khobson@odot.org City of Tulsa May 13, 2011](https://reader034.vdocuments.us/reader034/viewer/2022051400/551570ed55034674578b4fcf/html5/thumbnails/4.jpg)
![Page 5: Superpave Today Kenneth Ray Hobson, P.E. –Bituminous Engineer khobson@odot.org City of Tulsa May 13, 2011](https://reader034.vdocuments.us/reader034/viewer/2022051400/551570ed55034674578b4fcf/html5/thumbnails/5.jpg)
Automatic Marshall Automatic Marshall HammersHammers
![Page 6: Superpave Today Kenneth Ray Hobson, P.E. –Bituminous Engineer khobson@odot.org City of Tulsa May 13, 2011](https://reader034.vdocuments.us/reader034/viewer/2022051400/551570ed55034674578b4fcf/html5/thumbnails/6.jpg)
Texas Gyratory Hveem Texas Gyratory Hveem CompactorCompactor
![Page 7: Superpave Today Kenneth Ray Hobson, P.E. –Bituminous Engineer khobson@odot.org City of Tulsa May 13, 2011](https://reader034.vdocuments.us/reader034/viewer/2022051400/551570ed55034674578b4fcf/html5/thumbnails/7.jpg)
Superpave Gyratory Superpave Gyratory Compactor (SGC)Compactor (SGC)
![Page 8: Superpave Today Kenneth Ray Hobson, P.E. –Bituminous Engineer khobson@odot.org City of Tulsa May 13, 2011](https://reader034.vdocuments.us/reader034/viewer/2022051400/551570ed55034674578b4fcf/html5/thumbnails/8.jpg)
Limitations of Limitations of Traditional Binder Traditional Binder
SpecificationsSpecifications• Penetration & ductility tests are
purely empirical• Tests are conducted at one
standard temp (i.e.. Pen @ 77ºF,Vis @ 140ºF), despite different climatic conditions
• Entire range of pavement temperatures (esp. low temp’s) not considered
![Page 9: Superpave Today Kenneth Ray Hobson, P.E. –Bituminous Engineer khobson@odot.org City of Tulsa May 13, 2011](https://reader034.vdocuments.us/reader034/viewer/2022051400/551570ed55034674578b4fcf/html5/thumbnails/9.jpg)
Limitations of Limitations of Traditional Binder Traditional Binder
SpecificationsSpecifications• Asphalt cements can have
different temperature and performance characteristics within same grade (Pen or Vis)
• Not applicable to modified binders (more use in recent years)
• E.g. Grades AC-20, PMAC-1C
![Page 10: Superpave Today Kenneth Ray Hobson, P.E. –Bituminous Engineer khobson@odot.org City of Tulsa May 13, 2011](https://reader034.vdocuments.us/reader034/viewer/2022051400/551570ed55034674578b4fcf/html5/thumbnails/10.jpg)
Superpave Asphalt Superpave Asphalt Binder SpecificationBinder Specification
The grading system is based on Climate
PG 64 - 22
Performance Grade
Average 7-day max. pavement
temperature
Min. pavement
temperature
![Page 11: Superpave Today Kenneth Ray Hobson, P.E. –Bituminous Engineer khobson@odot.org City of Tulsa May 13, 2011](https://reader034.vdocuments.us/reader034/viewer/2022051400/551570ed55034674578b4fcf/html5/thumbnails/11.jpg)
Performance Graded Performance Graded Binder SpecificationsBinder Specifications
• Based on Mechanical Properties(DSR, BBR)oModulusoDeflectionoLoad Response (Rate)
• Other Tests Remain UnchangedoMass Change, Flash Point, Elastic Recovery, etc. ER is known as PG+ Spec.• ODOT 2009 Std. Spec. 708.03 Table 708:2
![Page 12: Superpave Today Kenneth Ray Hobson, P.E. –Bituminous Engineer khobson@odot.org City of Tulsa May 13, 2011](https://reader034.vdocuments.us/reader034/viewer/2022051400/551570ed55034674578b4fcf/html5/thumbnails/12.jpg)
Aggregate TestsAggregate Tests
• Superpave similar to Hveem with added tests: oFine Aggregate Angularity (FAA)oBulk Specific Gravity (used for
FAA and VMA computations)oMicro-Deval (30+ MESALs)
![Page 13: Superpave Today Kenneth Ray Hobson, P.E. –Bituminous Engineer khobson@odot.org City of Tulsa May 13, 2011](https://reader034.vdocuments.us/reader034/viewer/2022051400/551570ed55034674578b4fcf/html5/thumbnails/13.jpg)
Mix Design Proof Mix Design Proof TestingTesting
• Marshall Cohesiometer• Hveem Stabilometer• Hamburg Rut Test
![Page 14: Superpave Today Kenneth Ray Hobson, P.E. –Bituminous Engineer khobson@odot.org City of Tulsa May 13, 2011](https://reader034.vdocuments.us/reader034/viewer/2022051400/551570ed55034674578b4fcf/html5/thumbnails/14.jpg)
Design by Traffic Design by Traffic VolumeVolume
• Hveem – ADToLab Specimens (4” diameter)
Compacted the Same (275oF)oAir Void Limits Adjusted by Traffic
• Superpave –ESALs in 20 YearsoLab Specimens (6” diameter)
Compacted More with More Traffic (300oF)
oAir Void Limits Kept Constant
![Page 15: Superpave Today Kenneth Ray Hobson, P.E. –Bituminous Engineer khobson@odot.org City of Tulsa May 13, 2011](https://reader034.vdocuments.us/reader034/viewer/2022051400/551570ed55034674578b4fcf/html5/thumbnails/15.jpg)
Mix Design NotesMix Design Notes
• Ndes – Number of SGC Gyrations at JMF Binder
• Nini – Number of SGC Gyrations backcalculated from Ndes SpecimensoDensity Similar to That Behind Paver
• Nmax – Number of SGC Gyrations at End of Pavement Life (mix design only)
![Page 16: Superpave Today Kenneth Ray Hobson, P.E. –Bituminous Engineer khobson@odot.org City of Tulsa May 13, 2011](https://reader034.vdocuments.us/reader034/viewer/2022051400/551570ed55034674578b4fcf/html5/thumbnails/16.jpg)
Future Items of NoteFuture Items of Note
• WMA – The Future is here now!oProvides Many Benefits
• Tack Coats – 0.15 gal/SY Diluted 1:1oTrackless Tack Emulsion – Near
100% BondingoPave Sprayer Applied PMCRS-1S –
Near 100% Bonding
![Page 17: Superpave Today Kenneth Ray Hobson, P.E. –Bituminous Engineer khobson@odot.org City of Tulsa May 13, 2011](https://reader034.vdocuments.us/reader034/viewer/2022051400/551570ed55034674578b4fcf/html5/thumbnails/17.jpg)
2009 Std. Spec. 4112009 Std. Spec. 411
• Table 411:2 – Calculate Density (RD) Based on Latest Gse at JMF Binder Content for Pay Factor
• Table 411:4 – Binder Content (Pb) and Air Voids (AV) for Pay Factors
• CPF = (4 x RD + (3 x AV) + (3 x Pb)) / 10
![Page 18: Superpave Today Kenneth Ray Hobson, P.E. –Bituminous Engineer khobson@odot.org City of Tulsa May 13, 2011](https://reader034.vdocuments.us/reader034/viewer/2022051400/551570ed55034674578b4fcf/html5/thumbnails/18.jpg)
Future Items of NoteFuture Items of Note
• Increased Binder Content by Special ProvisionoPossible Reduction in SGC
GyrationsoPossible VMA Increase by 0.5%
![Page 19: Superpave Today Kenneth Ray Hobson, P.E. –Bituminous Engineer khobson@odot.org City of Tulsa May 13, 2011](https://reader034.vdocuments.us/reader034/viewer/2022051400/551570ed55034674578b4fcf/html5/thumbnails/19.jpg)
Links of NoteLinks of Note• Construction EngineeringoStandards, Specifications, Materials
and Testing• http://www.okladot.state.ok.us/cnstrctengr.htm
• Materials Division Contactso http://
www.okladot.state.ok.us/materials/index.htm
• Materials & Testing e-Guideo http://www.okladot.state.ok.us/materials/material
s.htm
![Page 20: Superpave Today Kenneth Ray Hobson, P.E. –Bituminous Engineer khobson@odot.org City of Tulsa May 13, 2011](https://reader034.vdocuments.us/reader034/viewer/2022051400/551570ed55034674578b4fcf/html5/thumbnails/20.jpg)
Links of NoteLinks of Note• Guidelines (Binder Selection and Thickness by
Type)o http://
www.okladot.state.ok.us/materials/pdfs/GUIDE-01.pdf
• Approved Performance Graded Binders and Otherso http://
www.okladot.state.ok.us/materials/htm-smap/11062p-BIT.htm
• Approved Superpave Mix Designso http://www.okladot.state.ok.us/materials/acmixportal.htm
• 100 Years of Transportation 1911 – 2011o www.okladot.state.ok.us/odot100
![Page 21: Superpave Today Kenneth Ray Hobson, P.E. –Bituminous Engineer khobson@odot.org City of Tulsa May 13, 2011](https://reader034.vdocuments.us/reader034/viewer/2022051400/551570ed55034674578b4fcf/html5/thumbnails/21.jpg)
Links of NoteLinks of Note• Approved List of Anti-Strip Additives and WMA
Technologieso http://www.okladot.state.ok.us/materials/htm-smap/
11062p-ASA.htm
• WMA Special Provisionso http://www.okladot.state.ok.us/c_manuals/
specprov2009/pdfs/xspn411-13.pdfo http://www.okladot.state.ok.us/c_manuals/
specprov2009/oe_sp_2009-708-22.pdf
• WMA – Information in Detailo http://warmmixasphalt.com/
![Page 22: Superpave Today Kenneth Ray Hobson, P.E. –Bituminous Engineer khobson@odot.org City of Tulsa May 13, 2011](https://reader034.vdocuments.us/reader034/viewer/2022051400/551570ed55034674578b4fcf/html5/thumbnails/22.jpg)
SummarySummary• Asphalt Mix Design Methods
o Superpave Most Common in History• Laboratory Mixture Compactors
o New SGC Compacts 6” Diameter Specimens• Asphalt Binders
o Performance Graded Using Mechanical Properties
• Aggregate Testso Little Added
• Mix Design Proof Testingo Rut Testing Prevents Premature Failure
![Page 23: Superpave Today Kenneth Ray Hobson, P.E. –Bituminous Engineer khobson@odot.org City of Tulsa May 13, 2011](https://reader034.vdocuments.us/reader034/viewer/2022051400/551570ed55034674578b4fcf/html5/thumbnails/23.jpg)
SummarySummary
• Design by Traffic VolumeoBased on ESALs for 20 Years
• Mix Design NotesoSGC Gyrations Critical for
Predictive Performance• Future Items of NoteoWMA – Adopted Nationwide Faster
than Superpave
![Page 24: Superpave Today Kenneth Ray Hobson, P.E. –Bituminous Engineer khobson@odot.org City of Tulsa May 13, 2011](https://reader034.vdocuments.us/reader034/viewer/2022051400/551570ed55034674578b4fcf/html5/thumbnails/24.jpg)
SummarySummary
• 2009 Std. Spec. 411oPay Factors – Increased for
Density by 10% and Removed Gradation
• Links Of NoteoSources for Additional InformationoUpdated Daily as Applicable
![Page 25: Superpave Today Kenneth Ray Hobson, P.E. –Bituminous Engineer khobson@odot.org City of Tulsa May 13, 2011](https://reader034.vdocuments.us/reader034/viewer/2022051400/551570ed55034674578b4fcf/html5/thumbnails/25.jpg)
Special ThanksSpecial Thanks
• Danny Gierhart, P.E. – Former Bituminous Engineer and Current Regional Asphalt Institute Engineer
• Reynolds H. Toney, P.E., Materials Division Engineer
• AudienceoEspecially Those with Questions
![Page 26: Superpave Today Kenneth Ray Hobson, P.E. –Bituminous Engineer khobson@odot.org City of Tulsa May 13, 2011](https://reader034.vdocuments.us/reader034/viewer/2022051400/551570ed55034674578b4fcf/html5/thumbnails/26.jpg)
Questions?Questions?