What drove specification changes? – Experience with quality products from QC/QA – Bridge deck evaluation research of 2008/2009 – ODOT inspection staff – Opportunity to use industry expertise – Best practices from other states Only 1 reported state from 34 responding has prescription mixes. Texas Pavement example:
2013 - 499 Concrete General 499 Specifications changes A new mix table Incorporates seven mix classes
Quantities per Cubic Yard - Provide Concrete with 6±2% Air Content Class Design Strength (psi) Permeability  Maximum (Coulombs) Cementitious Content  Minimum. (lbs) Aggregate Requirements QC 14,000 at 28 days2,000520Well-Graded QC 24,500 at 28 days1,500520Well-Graded QC 3 Special As per plan 1,500 or as per plan 520 or as per planWell-Graded QC 4 Mass Concrete As per plan  2,000 or as per plan 470   or as per plan Well-Graded QC MS  See Supplement 1126 N/A800  1 inch nominal max size QC FS  See Supplement 1126 N/A900  1 inch nominal max size QC Misc  4,000 at 28 days 550  1 inch nominal max size  AASHTO T277 Modified  Cementitious Content includes cement and pozzolan materials, denoted as Cm  Strength for Mass Concrete (QC 4) may be tested at either 28 or 56 days.  Do not use Type III cement or accelerating admixtures in mass concrete.  The maximum fly ash or GGBF slag content may be increased up to 50%.  For QC Misc mixes only –Water/Cementitious ratio limited to 0.50 maximum  Cement Only – No pozzolan materials 499 Specification Changes
2013 - 499 Specification Changes Supplier owns the mix design for ALL QC mixes Adjustments greater than 100 lbs. require Engineer approval. Supplier must maintain gradation in Zone II of the Coarseness Factor Chart.
Supplier owns the mix design for ALL QC mixes Adjustments greater than 100 lbs. require Engineer approval. Supplier must maintain gradation in Zone II of the Coarseness Factor Chart. Temperature increase to ACI 95 F. Partial hand written batch tickets not an option
2013 – Concrete Pavement Specification Changes Seven Major Specifications were revised or created 499 Concrete - General o Prescription mixes Class F, C, S, HP, MS, FS are gone o Well graded aggregate requirements for both 451/452 and 511. 451/452 Concrete Pavement o Revisions to adopt SS 888 ODOT QC/QA pavement concrete specifications 455 Quality Control Plan, Testing QC/QA Concrete o Incorporates concrete quality control specifications for 511 and 451/452 into one document Supplements 1126/1127 o S1126 Mix design submittal for JMF o S1127 New Pay factor criteria for 451, 452 and 511 Three other pavement specifications were updated to reflect material changes 255 Full Depth Removal with Rigid Replacement o RRCM - special mix design for rapid repair concrete was added. 608 Walks, Curb Ramps, and Steps 609 Curbing, Concrete Medians, and Traffic Islands
451-452 Specification Changes Materials section was updated to reflect the modifications to 499. References to 455 Quality Control Plan, Testing QC/QA Concrete Basis of Payment was modified to include with QC/QA or without. Longitudinal tining is now default. Transverse tining only allowed in small areas approved by Engineer. MIT Scan-2 Equipment is required for DBI paving. 451.18/S1127 Strength Pay Factors
2013 – with QC/QA or without? Without QC/QA Contractor performs QC to meet CMS 499. ODOT Perform QC checks on project for compliance with CMS 499 (slump, air, yield). Beam for every 7500yd 2 or fraction thereof daily by ODOT. Supplier/Contractor responsible to assure your well graded aggregates are maintained in Zone II. Core for every 2000yd 2 by contractor per S1064. With QC/QA CMS 455 governs QC/QA in addition to CMS 499
455 Quality Control Requirements Incorporates concrete quality control specifications from SS 888 and SS 898 for 511 and 451/452 into one document Only when with QC/QA is specified in the bid item. o 451-452 – generally over 10,000 Sq Yd Sets minimum requirements for Contractors Quality Control Plan (QCP). Project Engineer must review and approve QCP and can require changes. Sets the Quality Assurance testing requirements for the ODOT Project Staff. o Side by side air content – 10% of QC Samples o QA strength core for 1 in 10 QC Strength Cores
Supplement 1126 / 1127 S1126 - Developing and Submitting a Portland Cement Concrete Mix Design for Acceptance New supplement for Suppliers submission for JMF. S1127 - Pay Factors Determination for Pavement and Structure Concrete Provides direction for pay factor determination and example calculations.
202 – Steps Removed can be Lump or Foot o Measure along the front edge of each tread. Include the width of an integral wall in the width measurement. 251 – Partial Depth Pavement Repair o Partial Depth repairs can now be paid for by the Square Yard or Cubic Yard.
320 – Rubblize and Roll Spec only applies to Reinforced Concrete Pavements. Construction test pit requirements are redefined. Particle size control has been adjusted.
423 – Crack Sealing, Hot applied All items can now be paid for in Square Yards (Square Meters), in addition to Pounds (Kilograms).
615 - Roads and Pavements for Maintaining Traffic Section 615.01 Description work has been revised to include the removal of appurtenances. For rigid pavements, deleted the use of Class C concrete and replaced it with Concrete, Class QC 1. Section 615.10 Basis of Payment: Roads for Maintaining Traffic will include the installation, maintenance, and removal of all fencing, earthwork, guardrail, sidewalk, and all other items as necessary to provide a complete, functional, and safe installation.