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Caltrans Changes SECTION 39 “Hot Mix Asphalt” PowerPoint PPT Presentation


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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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Caltrans changes section 39 hot mix asphalt l.jpg

Caltrans ChangesSECTION 39“Hot Mix Asphalt”

Presented by:

Terrie Bressette

Caltrans


What changed terms l.jpg

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)


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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


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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


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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


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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


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Section 39 – CHANGESMaterials

  • Aggregate Qualities

    • Gradation(TV ± Tolerance)

    • LA Rattler

    • Sand equivalent

    • % Crushed Particles(2-face – New)

    • Fine Aggregate Angularity(New)

    • Flat & Elongated(New)


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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)


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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


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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


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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


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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


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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)


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Section 39 – CHANGESProduction

  • Materials Production Quality Program –

    • HMA & PCC (soon)

      • Weights and Measures

      • Safety

      • Limited production unit requirements


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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.


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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


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Thank you

Any Questions?


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