IDOT UPDATE Illinois Association of Aggregate Producers Eric E. Harm, PE Assistant Chief Engineer...
-
Upload
vernon-hudson -
Category
Documents
-
view
215 -
download
0
Transcript of IDOT UPDATE Illinois Association of Aggregate Producers Eric E. Harm, PE Assistant Chief Engineer...
IDOT UPDATE
Illinois Association of Aggregate Producers
Eric E. Harm, PEAssistant Chief Engineer
May 18, 2006
New Staffing
• Director of Highways – Milt Sees• Chief of Staff – Clayton Harris III• Chief of Operations – Brice Sheriff• Engineer of Tests – Matt Mueller
SAFETEA-LU
August 10, 2005 $295 B Nationwide $6.18 B Illinois (33% increase) Safety Emphasis
Earmarks
$1.25 B Highway Earmarks Over 300 Earmarks Required Match $315 M Shortfall ± $8 B
Downside
Locals have to match Obligation Ceiling ≈ 85% Funds are not upfront Cost of projects up Mix of projects
High Profile Earmarks New Mississippi River Bridge
$164 M plus $75 M for Missouri O’Hare Western Access
$140 M Prairie Parkway
$207 M River Bridge in Quad-Cities
$12 M plus $48 M for Iowa
Bond Program
?
Recycling
Reclaimed Asphalt Pavement
(RAP)
Let’s Rap on RAP
o Usage is in Chapter 53 BD&E Manual.
o Used successfully for 20 years.o Improvements made over the
years.
What’s Driving The Equation?
Aging systemFew bare pavements to overlay (How
many bare pavements did you drive over to get here?)
Limited new constructionMill and Fill 1:1
Results in excess Newer mixes with polymer limit RAP usage
What’s Driving The Equation?
Problem areasCurrently urbanState wide in future
More RAP’n
o Some agencies are not allowing RAP by showing “0% RAP” on plans.
o SB 120 introduced:• All mixes to use RAP and Rubber
Tires.• Died in committee.
o Need to follow sound usage of resources or it will be legislated to us.
S = I - OStorage = Inflow - Outflow
Piles of RAP = Milling – Reuse
Depends upon: Allowable RAP usage
Recycling Summit – 3 meetings
1. RAP as aggregate.2. Revisit RAP use in HMA.3. Concrete as Aggregate.
RAP as an Aggregate
Increase usage for Non-Quality uses
Look into ways of testing for Quality uses
RAP into HMA
Increase %’s Allow RAP in Polymer Mixes
Recycled Concrete as Aggregate
Change sampling stockpile to 10,000T
Use in HMA?
ASR
Alkali Silica Reactivity
Alkali-Silica Reaction (ASR)
• Alkalies React with Silica
– Alkalies from Cement/Cementitious Materials
– Silica from Aggregate
– Needs Water
– Gel is Formed
– Expands and Cracks The Concrete
ASR on IDOT System
• ASR Confirmed in Districts 3, 4, and 8
– Four bridge parapets
– Two bridge medians
– Two bridge decks
– One pavement
• Constructed Between 1985 and 1997
Cedar Street Bridge Extension (1988)
Cedar Street Bridge Median (1988)
I-255 Pavement (1985-86)
IL 116 over I-39 (1990)
IL 116 over I-39
Optical micrograph showing ASR gel fully filling circular void in center and partially filling circular void to left (width of field is 1.4 mm).
IL 116 over I-39
IL 251 over Mackinaw River (1992)
CTL Report:Cracking Related to ASR IL 29 (1997)
Alkali-Silica Reaction (ASR)
• Why So Long to Find This Problem?– FHWA Training– ASR Takes 5-15 Years to Manifest Itself– Requires Cores (Assumed D-Cracking)– Luck Because Low Alkali Cements Have
Been Used in Highly Reactive Locations
Alkali-Silica Reaction (ASR)
• Current Status– Specification Is In Final Draft Form– Industry Has Provided Numerous
Suggestions For Development– Specification Intent Is To Provide
Reasonable ASR Protection– No Intent To Burden Any One Industry
Quality Tests Quality Tests StreamliningStreamlining
Quality TestsQuality Tests
• Current: Every YearCurrent: Every Year
• New: Every Year or Every Other YearNew: Every Year or Every Other Year
Quality TestsQuality Tests
• Will Not Apply To:Will Not Apply To:– Special ProvisionSpecial Provision– Recycled ProductsRecycled Products
Quality Tests (Coarse)Quality Tests (Coarse)
• Tests Looked At:Tests Looked At:– SoundnessSoundness– AbrasionAbrasion– CountCount
Quality Tests (Fine)Quality Tests (Fine)
• Tests Looked At:Tests Looked At:– SoundnessSoundness– CountCount– Minus (-) #200Minus (-) #200
Quality TestsQuality Tests
• Reviewed 10 Years of Test DataReviewed 10 Years of Test Data
• Entire Ledge Was RatedEntire Ledge Was Rated
• This Year:This Year:– All every year and ½ of every other yearAll every year and ½ of every other year
• Next Year:Next Year:– All every year and other ½ plus any left All every year and other ½ plus any left
from this yearfrom this year
Freeze-thaw TestsFreeze-thaw Tests
• Current FrequencyCurrent Frequency>0.030 – Every Year>0.030 – Every Year
<0.030 – Every Other Year<0.030 – Every Other Year
Freeze-thaw TestsFreeze-thaw Tests
• New FrequencyNew Frequency>0.030 – Every Year>0.030 – Every Year
0.015 – 0.030 – Every Other Year0.015 – 0.030 – Every Other Year
<0.015 – Every Three Years<0.015 – Every Three Years
Quality on Quality on TicketsTickets
Quality on Quality on TicketsTickets
New Approved List
• Alphabetical• P/S #• Quality on Tickets (June 1, 2006)
– Ticket Designation– Material Approval
Quality on Tickets
• Thanks• Being rolled out this year!
Thank You!Thank You!Thank You!Thank You!