2019 Asphalt

SpecificationUpdate

SC-M SpecificationsSC-M-400 (01/18)

Asphalt Mixture Quality Acceptance

SC-M-401 (06/07)Mixing Plants for Hot-Mix Asphalt

SC-M-402 (01/18)Materials Properties for Asphalt Mixtures

SC-M-403 (04/16)Rideability for Asphalt Mixtures

SC-M-404 (05/10)Inspection of Asphalt Field Laboratories

https://www.scdot.org/business/technicalPDFs/supTechSpecs/SC-M-400_01-18.pdfhttps://www.scdot.org/business/technicalPDFs/supTechSpecs/SC-M-401.pdfhttps://www.scdot.org/business/technicalPDFs/supTechSpecs/SC-M-402_01-18.pdfhttps://www.scdot.org/business/technicalPDFs/supTechSpecs/SC-M-403_2016.pdfhttps://www.scdot.org/business/technicalPDFs/supTechSpecs/SC-M-404_0510.pdf

SC-M SpecificationsSC-M-405 (05/14)

Inspection & Approval Mix Design Laboratories

SC-M-406 (01/18)HMA Liquid Anti-Strip Additives (LASA)

SC-M-407 (06/11)Recycled Asphalt Pavement (RAP) & Asphalt Shingles (RAS)

SC-M-408 (04/15)Warm Mix Asphalt (WMA)

https://www.scdot.org/business/technicalPDFs/supTechSpecs/SC-M-405_05-114.pdfhttps://www.scdot.org/business/technicalPDFs/supTechSpecs/SC_M_406_1-18_LASA_Specification.pdfhttps://www.scdot.org/business/technicalPDFs/supTechSpecs/SC-M-407_06-11.pdfhttps://www.scdot.org/business/technicalPDFs/supTechSpecs/SC-M-408_(04-15).pdf

Asphalt Binder and Additives

• Updates based on recent changes to the AASHTO test procedures used for grading Performance Graded (PG) binders.

• AASHTO T-350- MSCR Test• AASHTO R-92 – MSCR SpecificationNote: This change currently only affects PG 76-22 binders.

IA Sampling • Continue with System Based Approach • Check each “active” plant and roadway tech a minimum of

once per year.• Important to notify IA Dept. when you have a new technician

on staff. – A updated list required and submitted annually in January to Chris Lybarker (lybarkercl@scdot.org).

• Inspectors will be checking to see that proper procedures are being followed and the testing equipment is operational and calibrated.

• Split samples will be taken and run at the OMR labs, if the samples fail, the process will need to be repeated.

IA Sampling – Example Org. Chart

Full Depth PatchingFull Depth Patching Materials

Depth of FDP

Select mixture type below based on Depth of FDP Alternate Mixture Options Typical Mixture

4” or Less Surface Type B / C 2 Lifts

Intermediate C 2 Lifts

6” Surface Type B / C 2 Lifts

Intermediate C 2 Lifts

8” Intermediate B Special 2 lifts

Intermediate C 3 lifts

10” Intermediate B Special 2 lifts

Intermediate C 3 lifts

12” or More Consult with the State Pavement Design Engineer

Full Depth Patching Materials

Depth of FDP

Select mixture type below based on Depth of FDP

Alternate Mixture Options

Typical Mixture

4” or Less

Surface Type B / C

2 Lifts

Intermediate C

2 Lifts

6”

Surface Type B / C

2 Lifts

Intermediate C

2 Lifts

8”

Intermediate B Special

2 lifts

Intermediate C

3 lifts

10”

Intermediate B Special

2 lifts

Intermediate C

3 lifts

12” or More

Consult with the State Pavement Design Engineer

Guidelines for Mix Selection

COURSE TYPE FACILITY TYPE EST. % BINDER BINDER GRADE

RECOM. RATE (LBS/SY) COMMENTS

SUR

FAC

E

• Interstate • Problem intersections and areas

(severe rutting and shoving potential) A 5.0 PG 76-22 200 • Consult with OMR Pavement Design Unit when other facilities are being considered

• High volume primary & secondary • ADT ≥ 5,000 B 5.3 PG 64-22 175 - 200

• Use only on high volume and / or high % Truck traffic roads

• FDP – Less than 6” or Less

• Low volume primary & secondary • ADT 1,500 – 5,000 C 6.0 PG 64-22 150 - 175

• Truck traffic ≥ 20%, use Surface Type B

• FDP Less than 6” or Less

• Low volume secondary routes • ADT < 1,500 D 6.3 PG 64-22 125 - 150

• Truck traffic ≥ 20%, use • Surface Type C • Use in lieu of PMTLSC on roads with rutting

or other surface imperfections

• Multiple facility usage • Consult with OMR Pavement Design Unit E 6.5 PG 64-22 45 - 80

• Used for ride correction and seal course

• Leveling between 0.5 – 2.0 inches

INTE

RM

EDIA

TE

• Interstate & High volume primary • (New Construction) A 4.6 PG 64-22 250 - 300

• Use when no drop off restrictions • Use Intermediate B when there are drop off

restrictions

• High volume primary & secondary • ADT ≥ 5,000 B 5.1 PG 64-22 200 • Old Surface Type B Mixture

• Interstate & High volume primary • ADT ≥ 5,000

B Special 5.4 PG 64-22 200 - 500

• Specialty warm mix – only used on high volume routes for partial –full depth rehabilitation and FDP (2 Lifts)

• Mixture must be placed in confined area

• Primary to low volume secondary C 4.8 PG 64-22 200 - 300 • Use for build-up and non-mainline paving and FDP

BA

SE

• Intersections & problem areas • Interstate • Primary & secondary routes with

ADT ≥ 5,000

A 4.5 PG 64-22 300 - 450

• Primary & secondary routes with ADT < 5,000 B 4.5 PG 64-22 300 - 450

• Special - Consult with OMR Pavement Design Unit C 5.5 PG 64-22 200 - 300 • Screening asphalt base – high stability

• Special – Consult with OMR Pavement Design Unit D 5.0 PG 64-22 200 - 300 • Sand asphalt base – low stability

SPEC

IALT

Y M

IXES

• Interstate

OGFC

6.5 PG 76-22 125 • Open graded friction course

• Primary and secondary PMTLSC 6.0 PG 64-22 0.75” Uncompacted • Preventative maintenance thin lift seal

course – select only for good roads

• Primary and Secondary SHOULDER WIDENING 5.0 PG 64-22 400 - 600 • Non-structural mix • Use on outer edge of pavement that does

not carry continuous traffic loads.

http://www.scdot.org/doing/technicalPDFs/materialsResearch/Guidelines_Asphalt_Mix_Selection.pdf

GUIDELINES FOR ASPHALT MIXTURE SELECTION

COURSE

TYPE FACILITY

TYPE

EST. % BINDER

BINDER GRADE

RECOM. RATE (LBS/SY)

COMMENTS

SURFACE

· Interstate

· Problem intersections and areas

(severe rutting and shoving potential)

A

5.0

PG 76-22

200

· Consult with OMR Pavement Design Unit when other facilities are being considered

· High volume primary & secondary

· ADT ≥ 5,000

B

5.3

PG 64-22

175 - 200

· Use only on high volume and / or

high % Truck traffic roads

· FDP – Less than 6” or Less

· Low volume primary & secondary

· ADT 1,500 – 5,000

C

6.0

PG 64-22

150 - 175

· Truck traffic ≥ 20%, use

Surface Type B

· FDP Less than 6” or Less

· Low volume secondary routes

· ADT < 1,500

D

6.3

PG 64-22

125 - 150

· Truck traffic ≥ 20%, use

· Surface Type C

· Use in lieu of PMTLSC on roads with rutting or other surface imperfections

· Multiple facility usage

· Consult with OMR Pavement Design Unit

E

6.5

PG 64-22

45 - 80

· Used for ride correction

and seal course

· Leveling between 0.5 – 2.0 inches

INTERMEDIATE

· Interstate & High volume primary

· (New Construction)

A

4.6

PG 64-22

250 - 300

· Use when no drop off restrictions

· Use Intermediate B when there are drop off restrictions

· High volume primary & secondary

· ADT ≥ 5,000

B

5.1

PG 64-22

200

· Old Surface Type B Mixture

· Interstate & High volume primary

· ADT ≥ 5,000

B

Special

5.4

PG 64-22

200 - 500

· Specialty warm mix – only used on high volume routes for partial –full depth rehabilitation and FDP (2 Lifts)

· Mixture must be placed in confined area

· Primary to low volume secondary

C

4.8

PG 64-22

200 - 300

· Use for build-up and non-mainline paving and FDP

BASE

· Intersections & problem areas

· Interstate

· Primary & secondary routes with

ADT ≥ 5,000

A

4.5

PG 64-22

300 - 450

· Primary & secondary routes with

ADT < 5,000

B

4.5

PG 64-22

300 - 450

· Special - Consult with OMR Pavement Design Unit

C

5.5

PG 64-22

200 - 300

· Screening asphalt base – high stability

· Special – Consult with OMR Pavement Design Unit

D

5.0

PG 64-22

200 - 300

· Sand asphalt base – low stability

Specialty Mixes

· Interstate

OGFC

6.5

PG 76-22

125

· Open graded friction course

· Primary and secondary

PMTLSC

6.0

PG 64-22

0.75” Uncompacted

· Preventative maintenance thin lift seal course – select only for good roads

· Primary and Secondary

SHOULDER WIDENING

5.0

PG 64-22

400 - 600

· Non-structural mix

· Use on outer edge of pavement that does not carry continuous traffic loads.

Revised: 01-01-18

Micro Surfacing - 2019

• Tack coats can be any Cationic emulsion. • Design requirements were updated to ISSA std.• Truck mounted machines must have computer

systems installed as with continuous machines.• Truck mounted machines are permitted to be used

if the road does not exceed 1200 ft.• Weather Restrictions – Seasonal Restrictions lifted,

50 degrees minimum temp, no temps below 32 forecasted within 24 hrs of application.

https://www.google.com/url?sa=i&rct=j&q=&esrc=s&source=images&cd=&cad=rja&uact=8&ved=2ahUKEwjyncXpivPfAhUFQKwKHWe3AEUQjRx6BAgBEAU&url=https%3A%2F%2Fcommons.wikimedia.org%2Fwiki%2FFile%3ABergkamp_Micro_Surfacing_Paver_214.jpg&psig=AOvVaw28epIPnmhDBjEi6ZU-xtdd&ust=1547754987282143

Micro Surfacing - 2019

• Rut – Leveling courses cannot be covered for a minimum of 12 hours to allow for curing-set.

• Calculations will be based on residual asphalt content on the BOL, if no BOL, then 62.0% is used to compute asphalt content.

• Removal of pavement markings- separate bid item.

OGFC - 2019

• WMA is required for OGFC.• Additional mix design requirements added based on

research performed by CU and NCAT.Cantabro – Abrasion resistance on cores < 15%Porosity (drainage) – much be ≤ 13.0%.9.5mm design added as an option for pavement design.Seasonal restrictions lifted, placement must be a minimum 55 degrees F, no placement if forecast is expected to below 32 degrees the day prior.

OGFC - 2019

OGFC Paving Plan - Improve our OGFC by reducing paver stops!Required within 5 days of beginning the pavingHauling - TruckingMix Delivery TempPaver OperationsCompaction OperationsProduction

OGFC - 2019

Slide – J. Johnston -2017

OGFC - 2019

Tack Coat – Must use a hot applied less tracking bond coat or PG 64-22 at a minimum of 0.08 gal/SY.Half load of OGFC may be discarded at beginning of LOT to help with transverse joint construction.OGFC must be placed within 90 minutes of being discharged at the plant.Excessive pavers stops > 15 mins will not be tolerated, written explanation required, stop production if necessary.

SMA - 2019

• Stone Matrix Asphalt (9.5 and 12.5mm)• Requires Good Coarse Aggregate and High Dust

Content as a filler and PG 76-22.• Several projects will likely be identified by the State

Pavement Design Engineer.• Projects may or may not have OGFC applied.• Good opportunity for industry to prove they can

step up to this challenge to produce and place a extraordinary longer lasting asphalt mixture.

https://www.google.com/url?sa=i&rct=j&q=&esrc=s&source=images&cd=&cad=rja&uact=8&ved=2ahUKEwjWgPmXi_PfAhUKMawKHTPjAEQQjRx6BAgBEAU&url=https%3A%2F%2Fwww.sciencedirect.com%2Fscience%2Farticle%2Fpii%2FS0950061811002935&psig=AOvVaw2OrWCIsHUznzK2roCGHrVJ&ust=1547755078520477

Questions?

Cliff SelkinghausAsphalt Materials Manager- OMR

selkinghcb@scdot.org803-737-6700

2019 �Asphalt �Specification�UpdateSC-M SpecificationsSC-M SpecificationsAsphalt Binder and AdditivesIA Sampling IA Sampling – Example Org. Chart Full Depth PatchingGuidelines for Mix SelectionMicro Surfacing - 2019Micro Surfacing - 2019 OGFC - 2019OGFC - 2019OGFC - 2019OGFC - 2019 SMA - 2019�����Questions?���Cliff Selkinghaus�Asphalt Materials Manager- OMR�selkinghcb@scdot.org�803-737-6700�