2008 KYTC/KAHCInformation Exchange

Meeting

Lexington, KY – March 3rd

Bowling Green, KY – March 10th

Material Spec. Changes / Structural Branch

• Concrete Pavement Opening Strength

• Concrete Plants for Large Projects

• Coring Concrete Pavement for Thickness

• Pavement Drainage Blankets

• Striping Retroreflectivity

• Cold Weather Concrete

Concrete Pavement Opening Strength

• Supplemental Spec Change July 22, 2005

• Performed a Nationwide Survey of DOT’s

• DOT’s Average 3000 psi for Opening

• KY Changed Opening Strength to 3000 psi

• Acceptance Based on 3500 psi at the Required Age

Concrete Plants for Large Projects

• Supplemental Spec Change July 22, 2005 • Large Projects are ≥250 Cubic Yards• Total Cubic Yardage is for ALL Concrete on the

Contract– Concrete Bid Items (example - Concrete Class A)– Incidental Concrete (example – Guardrail End

Treatments)

• Plants Must be on the List of Approved Materials and Comply with KM 64-323

Coring Concrete Pavement for Thickness

• Supplemental Spec Change August 11, 2006

• Contractor Responsible for Performing Coring in Accordance with KM 64-309

Pavement Drainage Blankets

• New Change for 2008 Specifications

• No Untreated Drainage Blankets

• Drainage Blankets will have to be Asphalt or Cement Treated– Type II (Asphalt Treated)– Type III (Cement Treated)

• Constructability and Performance Issues

Striping Retroreflectivity

• New Changes for 2008 Specifications• Raised the Bar on Retro Acceptance for

Permanent Striping, Durable Markings, and Thermo for Intersections

• Based on Determination that Higher Numbers Were Easily Achieved and Most Contractors Received Maximum Bonus on District-Wide Projects

• All Yellow Thermo Must be Nonleaded• Intend to Set Contracts Up with Temporary and

Permanent Striping

Cold Weather Concrete

• Future Changes for Specifications– Plan– Temperature Recordings – Temperature Controls– Placement– Curing– ACI 306R, ACI 306.1

Questions or Comments?

Ross MillsDivision of Materials

(502) 564-3160ross.mills@ky.gov