specification update

2014 AAPA Conference March 11-12, 2014

Curtis Vincent, P.E.Construction Engineer

Lyndi Davis Blackburn, P.E.Assistant Materials and Tests Engineer

Specification Update


General Application Special Provision

• 12-0263(3)– Section 106– Section 410– Section 420– Section 423– Section 424


Section 106

• Item 106.09(c)6

• Subarticle 106.09(a)

– Pay Factors will not be applied to mixes where the roadway density requirement has been lowered below 94%.

– Correction of AASHTO Standard Reference from TP 71 to T 344.


Section 410

• Article 410.01

• Item 410.02(e)2

Defined Surface Layers

Changed Allowable RAP & RAS usage.


Allowable Use of RAP & RASALLOWABLE USE OF RAP AND RAS

Maximum Allowable Percent of RAP and RAS by mass of Total Aggregate Content

Type of Mix Maximum RAP Content # Maximum RAP and RAS Content **

327, Plant Mix Bituminous Base 25 % RAS Not Allowed

327-E, Permeable Asphalt Treated Base 10 % RAS Not Allowed

420, Open Graded Friction Course 10 % RAP shall not contain chert* RAS Not Allowed

423, Stone Matrix Asphalt424, Superpave

Surface Layers: 20 % with no more than 15 % containing chert

*;All Other Layers: 35 %

Surface Layers: 20 % *;All Other Layers: 35 %

* This limitation applies even if the surface layer is to be covered by an Open Graded Friction Course (Section 420). If the aggregate is chert gravel with a bulk specific gravity that is less than 2.550, a maximum of 15 % of the RAP will be allowed. RAP containing chert gravel shall be crushed so that 100 % of the RAP passes the 1/2 inch {12.5 mm} sieve. Additional RAP that does not contain chert gravel may be added to the mixture through a separate feeder. ** RAS shall be limited to 5 % by mass of the total aggregate content.


Section 410

• Article 410.01• Item 410.02(e)2

• Item 410.02(e)4

• Previously Item 410.02(e)5

– Defined Surface Layers– Changed Allowable RAP

& RAS usage.

– Added RAS stockpile requirements.

– Deleted Additional Testing Requirements for Recycled/Reclaimed mixes over 25%


Section 410 (Continued)

• Subarticle 410.02(f)

• New Item 410.02(f)4

• Added RAS as a fiber stabilizer

• Added Synthetic fibers


Slide on RAS and Synthetic Fiber(f) LIQUID ASPHALT BINDER DRAINDOWN.

1. FIBER STABILIZER.A fiber stabilizer is required for some mix

types (Section 420, 423, etc). A fiber stabilizer may be used on other mix types where asphalt binder cement draindown is a problem. Where RAS is included in the JMF, fiber stabilizer shall not be required provided the draindown requirements of 0.30% or less are met when tested in accordance with AASHTO T305 at 325°F {163°C} and 350°F {176°C}.


Slide on RAS and Synthetic Fiber

4. SYNTHETIC FIBERS.Synthetic fibers shall include but are not limited

to one or a combination of the following: polyolefins (such as polyethylene and polypropylene) and aramids (such as Kevlar, Twaron and Nomex). Fibers shall be twisted fibrillated, flat fibrillated or monofilament with a maximum fiber length of 0.75 inches {19 mm}


Section 410 (Continued)

• Subarticle 410.02(f)

• New Item 410.02(f)4

• Item 410.03(c)3

• Added RAS as a fiber stabilizer

• Added Synthetic fibers

• Added in Density Requirement when the leveling layer meets minimum rate requirements.


Item 410.03(c)3. Leveling

Leveling shall be compacted to meet the density requirements given in Article 410.04 if the minimum required placement rate shown on the plans is equal to or greater than the placement rate given in the following table for the maximum size aggregate in the mix. Compaction shall be to the satisfaction of the Engineer if the placement rate shown on the plans is less than the placement rate shown in the following table.


Item 410.03(c)3. LevelingDENSITY REQUIREMENTS FOR LEVELING BASED ON AGGREGATE SIZE

AND PLACEMENT RATE*

Maximum Size Aggregate in the Leveling Mix

Specified density is required if the minimum required placement rate shown on the plans

is equal to or greater than:

3/8 inch 80 lb/yd2

1/2 inch 135 lb/yd2

3/4 inch 165 lb/yd2

1 inch 250 lb/yd2

1 1/2 inch 330 lb/yd2

*In-place density pay factors will be applied.


Section 420 - OGFC

• Subarticle 420.02(e) • Allows CQS-1hp Asphalt Emulsion with the Spray Paver equipment or“PG Asphalt for Trackless Tack with Conventional Paver equipment.


Section 423 & Section 424

• For Any Mixes Containing RAS

• Minimum Liquid Asphalt Binder is increased by 0.2

• Air Voids will be designed on 3.5%.


Other Stuff

Every Day CountsIntelligent Compaction – at least two

pilot projects.

Inertial Profiler – Smoothness TestingHave 3 pilot projects underway.


Questions?

Lyndi [email protected]


Asphalt Pavement

• Specifications Detailed Technical Lengthy Complicated


Asphalt Pavement

• Common Sense Right vs. Wrong

• Workmanship Pleasing to the eye Looks bad ----- Is Bad


Process

Inspection

Workers


Industry Impacts

• ATRIP = $1,000,000,000 Program Approximately 1100 projects received some amount of funding Approximately 750 of those are system preservation/ roadway improvements

• Annual resurfacing program = $250,000,000• Large portion of remaining budget is roadway related


Construction Quality?


Construction Quality

• The Obvious


Construction Quality?


Questions?

specification update

Documents

ras content

additional rap

02f4added ras

ras stockpile requirements

mix types section

02e2 item

chert gravel

f new item