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Caltrans Changes SECTION 39 “Hot Mix Asphalt”

Caltrans Changes SECTION 39 “Hot Mix Asphalt”. Presented by: Terrie Bressette Caltrans. What Changed? TERMS. Hot Mix Asphalt (HMA) = Asphalt Concrete (AC) Rubberized HMA (RHMA) = Rubberized AC (RAC) Open Graded Friction Course (OGFC) = OGAC RHMA-G = RAC (Type G)

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Caltrans Changes SECTION 39 “Hot Mix Asphalt”

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  1. Caltrans ChangesSECTION 39“Hot Mix Asphalt” Presented by: Terrie Bressette Caltrans

  2. What Changed? TERMS • Hot Mix Asphalt (HMA) = Asphalt Concrete (AC) • Rubberized HMA (RHMA) = Rubberized AC (RAC) • Open Graded Friction Course (OGFC) = OGAC • RHMA-G = RAC (Type G) • RHMA-O & -O-HB = RAC (Type O) & (Type O-HB) • Tack Coat = Paint Binder (Tack Coat) • Geosynthetic Pavement Interlayer = • Pavement Reinforcing Fabric (PRF)

  3. What Changed?Section 39 – AC vs. HMA • Old Standard Specifications • Section 39 – AC = 12,000 Words • New “Amended to Read” • Section 39 – HMA = 18,000 Words • SSPs • Section 39 AC = 21 SSPs 58,000 Words • Section 39 HMA = 12 SSPs 28,500 Words

  4. What Changed?Standard Special Provisions • 12 SSPs from 30+ Old SSPs • 39-AAA – HMA Type A & B • 39-BBB – OGFC • 39-CCC – RHMA-G • 39-DDD – RHMA-O & RHMA-O-HB • 39-EEE – HMA (Misc. Areas) • 39-FFF – Minor HMA • 39-GGG – Rumble Strips (Ground in) • 39-HHH – HMA-Lime Slurry • 39-III – HMA-Dry Lime • 39-JJJ – HMA-Liquid Anti-Strip • 39-KKK – Prime Coat • 39-LLL – Replace AC Surface

  5. What Changed?Standard Special Provisions • New SSPs • 39-MMM – Large Stone Mix • 39-NNN – High Stability Mix • 39-OOO – Bonded Wearing Course (Gap-Graded) • 39-PPP – Bonded Wearing Course (Rubberized) • District Requested • Extra testing required by aggregate issues • Lime-slurry marination required

  6. Section 39 – CHANGESMix Designs • Still Hveem Method of Mix Design • Dense Graded – HMA (Type A & B) Rubberized HMA – RHMA-G • Mix Design by Producer • State Verifies JMF with Plant Mix • Mix design good for 12-months • Flat & Elongated • Open Graded – OGAC, RHMA-O & O-HB • Aggregate qualities and gradation by Producer • State determines asphalt content • Mix design good for 12-months

  7. Section 39 – CHANGESMaterials • Aggregate Qualities • Gradation(TV ± Tolerance) • LA Rattler • Sand equivalent • % Crushed Particles(2-face – New) • Fine Aggregate Angularity(New) • Flat & Elongated(New)

  8. Section 39 – CHANGESMaterials • Mix Qualities • Binder Content • Air voids content • Stability (Mix & Production) • HMA moisture content • Voids in Mineral Aggregate (Mix Design & Verification) • Voids Filled with Asphalt (Mix Design Only) • Dust Proportion (Mix Design Only)

  9. Section 39 – CHANGESMaterials • CT371 Pilot • California Test (CT) 371  AASHTO T283-03 • In QC/QA projects for 2 years • Estimate approx 25 projects / year • Producer tests mix with CT371 • Chooses treatment choice (TSR  70) • Test HMA at least once during production • District & Translab tests also (FIO) • Data analysis – repeatability, lab / lab, mix vs. production

  10. Section 39 – CHANGESConstruction • Processes – • Standard • HMA (Type A & B) • RHMA-G • OGAC & RHMA-O • Method • Small quantities • QC/QA - >10,000 tons • HMA (Type A & B) • RHMA-G

  11. Section 39 – CHANGES(3 Construction Processes) • Standard – • Applies to the majority of HMA. • Contractor QC plan & tests at least twice daily • Compaction (91 – 97% of Rice) • State will test and results will be used for acceptance and pay

  12. Section 39 – CHANGES(3 Construction Processes) • Method – • Applies to very small quantities of HMA • The contractor will not perform QC • Method compaction with roller and temperature requirements • State will test and results will be used for acceptance and pay. • Default for compaction when layer <0.15-ft

  13. Section 39 – CHANGES(3 Construction Processes) • QC/QA – • All HMA quantities greater than 10,000 tons. • QC tests for each 750 tons of HMA • State will verify gradation & % binder • 1 verification per 5 QC tests • Statistical evaluation of gradation, % binder and compaction for pay. • Verified contractor QC for gradation & % binder • Sate cores for compaction (92 – 96% of Rice)

  14. Section 39 – CHANGESProduction • Materials Production Quality Program – • HMA & PCC (soon) • Weights and Measures • Safety • Limited production unit requirements

  15. Section 39 – CHANGESPlacement • Lift Thickness > 3 X NMAS e.g. ¾-inch mix = 0.20-ft layer and above ½-inch mix = 0.125-ft layer • Must comply for compaction • Contractor may change gradation of mix if ¾” mix and 0.15 to 0.20 layer • Not required for Method • Thin blanket – Maintenance • Leveling, etc.

  16. Section 39 – CHANGES • HMA must meet all specification requirements throughout production and placement. • First out of spec = Contractor Fix • Second out of spec = Stop, test, show RE before starting up • In-place & out-of-spec material • RE determines status on case-by-case

  17. Thank you Any Questions?

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