Transcript ALDOT Specifications Presentation

Specification Update
Curtis Vincent, P.E.
Construction Engineer
Lyndi Davis Blackburn, P.E.
Assistant Materials and Tests Engineer
2014 AAPA Conference
March 11-12, 2014
General Application Special Provision
• 12-0263(3)
–
–
–
–
–
Section 106
Section 410
Section 420
Section 423
Section 424
2014 AAPA Conference
March 11-12, 2014
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.
2014 AAPA Conference
March 11-12, 2014
Section 410
• Article 410.01
Defined Surface Layers
• Item 410.02(e)2
Changed Allowable RAP &
RAS usage.
2014 AAPA Conference
March 11-12, 2014
Allowable Use of RAP & RAS
ALLOWABLE USE OF RAP AND RAS
Maximum Allowable Percent of RAP and RAS by mass of Total Aggregate Content
Maximum RAP and RAS
Type of Mix
Maximum RAP Content #
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
423, Stone Matrix Asphalt
424, Superpave
10 %
RAP shall not contain chert*
Surface Layers: 20 % with no
more than 15 % containing chert
*;
All Other Layers: 35 %
RAS Not Allowed
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.
2014 AAPA Conference
March 11-12, 2014
Section 410
• Article 410.01
• Item 410.02(e)2
– Defined Surface Layers
– Changed Allowable RAP
& RAS usage.
• Item 410.02(e)4
– Added RAS stockpile
requirements.
– Deleted Additional
Testing Requirements for
Recycled/Reclaimed
mixes over 25%
• Previously
Item 410.02(e)5
2014 AAPA Conference
March 11-12, 2014
Section 410 (Continued)
• Subarticle 410.02(f)
• New Item 410.02(f)4
• Added RAS as a fiber
stabilizer
• Added Synthetic fibers
2014 AAPA Conference
March 11-12, 2014
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}.
2014 AAPA Conference
March 11-12, 2014
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}
2014 AAPA Conference
March 11-12, 2014
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.
2014 AAPA Conference
March 11-12, 2014
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.
2014 AAPA Conference
March 11-12, 2014
Item 410.03(c)3. Leveling
DENSITY REQUIREMENTS FOR LEVELING BASED ON AGGREGATE SIZE
AND PLACEMENT RATE*
Specified density is required if the minimum
Maximum Size Aggregate
required placement rate shown on the plans
in the Leveling Mix
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.
2014 AAPA Conference
March 11-12, 2014
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.
2014 AAPA Conference
March 11-12, 2014
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%.
2014 AAPA Conference
March 11-12, 2014
Other Stuff
Every Day Counts
Intelligent Compaction – at least two pilot
projects.
Inertial Profiler – Smoothness Testing
Have 3 pilot projects underway.
2014 AAPA Conference
March 11-12, 2014
Questions?
Lyndi Blackburn
334-206-2203
[email protected]
2014 AAPA Conference
March 11-12, 2014
Asphalt Pavement
• Specifications
Detailed
Technical
Lengthy
Complicated
2014 AAPA Conference
March 11-12, 2014
Asphalt Pavement
• Common Sense
Right vs. Wrong
•
Workmanship
Pleasing to the eye
Looks bad ----- Is Bad
2014 AAPA Conference
March 11-12, 2014
Process
Equipment
Workers
Inspection
2014 AAPA Conference
March 11-12, 2014
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
2014 AAPA Conference
March 11-12, 2014
Construction Quality?
2014 AAPA Conference
March 11-12, 2014
Construction Quality
• The Obvious
2014 AAPA Conference
March 11-12, 2014
Construction Quality?
2014 AAPA Conference
March 11-12, 2014
Construction Quality?
2014 AAPA Conference
March 11-12, 2014
Construction Quality?
2014 AAPA Conference
March 11-12, 2014
Construction Quality?
2014 AAPA Conference
March 11-12, 2014
Construction Quality?
2014 AAPA Conference
March 11-12, 2014
Construction Quality?
2014 AAPA Conference
March 11-12, 2014
Construction Quality?
2014 AAPA Conference
March 11-12, 2014
Construction Quality?
2014 AAPA Conference
March 11-12, 2014
Construction Quality?
2014 AAPA Conference
March 11-12, 2014
Construction Quality?
2014 AAPA Conference
March 11-12, 2014
Questions?
2014 AAPA Conference
March 11-12, 2014