FAA AC 150/ H Draft Principal Changes
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1 FAA AC 150/ H Draft Principal Changes 2018 Indiana Chapter ACPA Workshop Indianapolis, IN Gary L. Mitchell, P.E. Vice President American Concrete Pavement Association
2 Credits Doug Johnson and Greg Cline FAA pavement engineers Slides based on a presentation Doug Johnson gave at the ACPA Annual Meeting in 2017 Based on collaboration with Doug and Greg during drafting the proposed specification Industry acknowledges their willingness to work with numerous associations
3 Overview Updated References Extensive technical and editorial edits Added New Specs Added payment for Contractor Quality Control Control Strips with most all P specs 501 numerous changes
4 Collaboration with Industry Collaboration with Industry American Concrete Paving Association (ACPA) Airports Consultant Council (ACC) National Stone Sand Gravel Association (NSSGA) Geosynthetic Materials Association (GMA) American Society of Civil Engineers (ASCE) Asphalt Institute (AI)
5 Part 1: General Provisions Section 10 New Definitions Certificate of Analysis (COA) Certificate of Compliance (COC) Modification of Standards (MOS) Contractor Laboratory now Contractors Quality Control (QC)Facilities Laboratory now Quality Assurance (QA)Laboratory
6 Part 2: General Construction Item 100 Contractor Quality Control Program (CQCP) Encouraged for all projects Required >$500K in paving Assure continuous monitoring of quality of materials and production Establish corrective action plans (NEW) Pay Item for CQCP
7 Item C-100
8 Item C-100
9 Contractor Quality Control Program More than test results: Materials, equipment, workmanship, Inspection and QC testing and documentation Corrective Action Plans Plan ahead of what to do when QC & QA criteria not met
10 Control Strips Control Strip all P Specs Earthwork, Aggregates, Surface Courses Demonstrate Material, Equipment and Construction Processes meet requirements of the specification Best interest of everyone
11 Part 3: Sitework P154 Clarified how to use RAP in subbase as well as recycled concrete pavement Control Strip P Lime Treated Subgrade Control Strip to demonstrate materials, equipment and process
12 Part 3: Sitework P156 Cement Treated Subgrade New specification for modification of subgrade P157 [Cement][Lime] Kiln Dust Treated Subgrade Added option for use of either CKD or LKD
13 Part 4: Base Courses P207 Full Depth Reclamation (FDR) Recycled Asphalt Aggregate Base Course New Specification How it will perform f(amt HMA, Condition HMA, Amt Aggregate, Use of Stabilizing Agent) Better P154, Maybe than 209 (if stabilizing agent) Control Strip In response to most common MOS
14 Part 4: Base Courses P Added Table of Required Material Properties P Fraction passing No 200 shall not exceed 2/3 the fraction passing No 40 P Option for Separation Fabric P Control Strip
15 Part 4: Flexible Base Courses P Material Properties in Table Format P Fraction passing No 200 shall not exceed 2/3 the fraction passing the No QC for Gradation by lot Option for Separation Fabric P Control Strip
16 Part 5: Rigid Base Courses P301 Cement Treated Soil-Aggregate Subbase Course New Title P Control Strip P304 Cement Treated Aggregate Base Course (CTB) New title P Control Strip
17 Part 5: Rigid Base Courses P Control Strip P (econocrete) Added option to test thickness by survey P307 Cement Treated Permeable Base Course (CTPB) New specification Size 67 (or 57) aggregate stabilized with cement ~ 1000 ft/day permeability (Model as variable stabilized base in FAARFIELD)
18 Part 7: Rigid Pavement P a Reactivity tests representative of material sources for project 1260 and 1567 may be run concurrent P b Follow ASTM C33 for fine aggregate deleterious No 200 no longer counted toward deleterious Total deleterious limited to 1.0%
19 Part 7: Rigid Pavement P c Engineer selects maximum size aggregate based upon thickness and what is available in area Deleterious Material finer No 200 up to 1.5 if material is dust of fracture Methylene blue or Xray diffraction Max deleterious 3.8% (fracture dust)
20 Part 7: Rigid Pavement P d Combined Aggregate Gradation Contractor submits PCC combined Gradation P Proportions w/c between by weight Slump 2 Slip Form 3 Fixed Form 4 Hand Placement
21 Part 7: Rigid Pavement P Mix Design Generally 3 mix designs Slip Form Fixed Form Hand Placement Contractor selects Air Content needed based upon maximum aggregate size and environmental condition
22 Part 7: Rigid Pavement P Control Strip Initial 250 feet Demonstrate materials, equipment and Construction Process P Equipment Rate of vibration sufficient to consolidate without segregation or voids American Concrete Institute (ACI) 309R
23
24 Part 7: Rigid Pavement P Limitations on Mixing and Placing ACI 306R Cold Weather Concreting ACI 305R Hot Weather Concreting Temperature Management Program FHWA HIPERPAV 3 Example of TMP P Placing concrete Rate of vibration sufficient to consolidate without segregation, voids or vibrator trails Excessive edge slump remove area the full width of the slip form lane
25 P Joints vertical alignment Part 7: Rigid Pavement Tie and dowel bars within ¼ per foot Dowels in hardened concrete Spalling beyond grout retension ring must modify equipment and operations reapply curing compound after sawing joints. P Finishing Straightedge testing QC
26 Part 7: Rigid Pavement P Repair, removal or replacement of slabs How bad is bad Shrinkage cracks < 1/3 slab depth cleaned and repaired with high molecular weight methacrylate (HMWM) or expoxy resin in presence of engineer Cracks > 1/3 slab in interior remove and replace Spalls < ½ slab < 25% joint length Spall repair payment for that slab reduced by 5% Grinding over 50% of slab 5% reduction in payment
27 Part 7: Rigid Pavement P Contractor Quality Control Gradation Moisture Slump Air Unit Weight and Yield Temperature Smoothness
28 Part 7: Rigid Pavement P Control Charts Fine and Coarse Aggregate Gradation Slump and Air Combined Gradation CF and WF
29 Part 7: Rigid Pavement
30 Part 7: Rigid Pavement P Corrective Action CQCP shall indicate appropriate action P Acceptance Sampling and Testing Samples transported in molds Curing by immersion (after 24 hours) P Lot Size 2000 cubic yards Sublots equal cubic yards
31 Part 7: Rigid Pavement P Acceptance Criteria Strength Thickness Grade Profiograph Adjustments for Repairs P Payment Rejected PCC may stay in place at 50% pay with concurrence of Engineer and FAA
32
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