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Blair Heptig KAPA/KDOT Fall Forum Blair Heptig KAPA/KDOT Fall Forum

Blair Heptig KAPA/KDOT Fall Forum - PowerPoint Presentation

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Uploaded On 2019-06-22

Blair Heptig KAPA/KDOT Fall Forum - PPT Presentation

October 2018 KDOT ASPHALT UPDATE Continue with bond testing 339 miles for FY 2019 as of December letting Intent establish a tack procedure that produces a good bond tack coat quality ID: 759826

air bond voids surface bond air surface voids max density tons rap 115 mix minimum ras project 2018 price test 2019 gmm

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Presentation Transcript

Slide1

Blair Heptig

KAPA/KDOT Fall ForumOctober 2018

KDOT ASPHALT UPDATE

Slide2

Continue with bond testing339 miles for FY 2019 as of December lettingIntent – establish a tack procedure that produces a good bond (tack coat quality)

Fiscal YearCenterline Miles with Bond Test201834720173452016802015399201455920132912012189201167

BOND TEST

Slide3

New products/approved alternates on bond test projectsCBC-1HT (eTac) from ErgonOthers?Spray paverUse when overlaying PCCP or UBAS67 centerline miles in FY 2018

TACK

Slide4

CORES

Bond test special provision revisedStart paying for bond test coresNew Engineer determines testing frequency“Bond Core” bid item, $90 set price for each 6” core

Slide5

CORES

Section 602 special provision revisedPay for density dispute cores Decreased from 1.5 times the price of calibration cores (1.5 x $45 = $67.50) to 1 times the price (1 x $45 = $45)Concerns from Construction – documentation issuesDidn’t want to make a dispute core bid item at this time

Slide6

SURFACE QUALITY

Section 602 special provisionConsidered changing requirement for minimum number of rollers from 2 minimum @ 275 tph to 2 minimum @ 250 tphNo change at this time – continue to monitor

Slide7

Overlay bumpsProfilograph uses a minimum scallop length of 2 ftKDOT to check with straight edge“Tears” or roller marks/cracksTexture issues

SURFACE QUALITY

Slide8

RCI

Section 614 special provision revisedChanged target air voids in design from 4.5% to a range of 4.5% – 5.0% Target remains 4.5% during productionMinimize aggregate blend changes

Slide9

Increase of minimum VMA requirement0.1% for every 1% RAS used in the mixHandled on project by project basis – Modified RequirementsMay not use on some high volume 3% air voids projects or SR-9.5A mixes with 3% air voids

RAS

Slide10

RAS

Working with KAPA on developing requirements to weigh RAS at the plantCurrently control RAP/RAS proportions by calibrationAssess variability in feed and weightsGoal is to implement in FY 2020Likely weigh depletion (load cells) or weigh bridge

Slide11

MIX DESIGN

1,681,847 total tons of HMA let in FY 2018

Commercial grade = 79,637 tons

UBAS = 59,485 tons

RCI = 21,093 tons

4% air voids = 723,314 tons

3% air voids = 798,318 tons (47%)

Higher percentage of 3% air voids projects in FY 2019

FY 2019 EFT trial projects in District 2

Slide12

MIX DESIGN

NCHRP Report 567

3%

Va

, 94% density

4%

Va

, 93%

density

Slide13

Why not on 4% air voids projects?Targets may not be achievableConsiderationsRoad structureFWD dataDistress dataActionAction historyAngularity?%Gmm at Nini?Gyratory revolutions?RAP?

INCREASED IN-PLACE DENSITY

Slide14

INCREASED IN-PLACE DENSITY

2017K-25 Logan County7/75/115 rev40% max RAPNo SSG limitRelax FAA and %Gmm @ Nini (92.0%)

2018

US-77 Geary County

7/75/115 rev

15% max RAP

K-27 Wallace County

Both lifts (12.5A and 19A)

7/75/115 rev

25% max RAP

Slide15

INCREASED IN-PLACE DENSITY

2019K-9 Phillips Co. & Smith Co.Surface lift only (not 19A)7/75/115 rev40% max RAPNo SSG limitRelax FAA and %Gmm @ Nini (92.0%)I-70 Thomas Co.Both lifts (12.5A) 8/100/160 rev25% max RAPRelax %Gmm @ Nini (91.5%)

2019

US-24 Cloud Co.

Surface lift only (not base 12.5A)

7/75/115 rev

20% max RAP

US-283 in Trego Co. and Graham Co.

Surface lift only (not 19A)

7/75/115 rev

40% MAX RAP

Slide16

ASPHALT BINDERS

Recycling agents (rejuvenators)Used in several shoulder mixesMonitoring mainline mixes2014 project on US-160 in Labette Co. & Montgomery Co.2015 project on K-232 in Lincoln Co. & Ellsworth Co.2018 project K-57, K-244 and K-244S in Geary County2019 projectsShoulder mix on US-81 in Republic Co.Mainline mix on K-266 in Republic Co.Evoflex, Hydrogreen and Delta S options

Slide17

ASPHALT BINDERS

REOBs (re-refined engine oil bottoms)FHWA checked binder prequalification samples using X-ray fluorescence spectroscopy (XRF) No REOBs detectedDeveloping protocol to check for REOBsAsh testΔTc – after 20 hr PAV and after 40 hr PAVXRF – trial tests being performed at KSU

Slide18

PERFORMANCE TESTING

Collecting data on field produced mixes

Goal – assess how mix properties affect performance

Volumetrics

Aggregate properties

Compaction

Recycled materials

Binder grades

Additives

Potentially modify “recipe” based on the results

Can equivalent mix be produced for lower price?

Can durability be improved for the same or similar price?

Slide19

TOOLBOX

Surface treatments Mastic surface treatment (Onyx)Centerline rumble strip sealProducts – mastic, tack, rejuvenator, rejuvenating emulsion, striping material Scrub seal

Slide20

QUESTIONS?

Thank you!