Post Installation Inspection & RCP Evaluation Tools

1. Post Installation Inspection & RCP Evaluation Tools

2. Goal • Share our Experiences from other States Requiring Similar PII Tools and Techniques • Provide Knowledge and Tools to obtain Correct Evaluation of Installed RCP www.concrete-pipe.org

3. ME VT WA MT ND MN NH NY OR WI MA ID MI RI SD WY CT PA IA OH NJ NE IN IL DE MD WV VA UT CO NV MO CA KS KY NC TN OK AR SC AZ NM MS GA AL AK LA TX FL About 30 State DOT’s require some type of Post Installation Inspection Storm Drainage 22 – States (Yellow) Require Mandrel Inspections – some considering CCTV + Laser Profiling + Micrometers 12 – States (Hashed) currently require or allow CCTV + Laser Profiling + Measurements of defects

4. Experiences From Other DOT’s/Munis. Stringent PII Inspection Specs. On Street Fire-Drills 1st Fire Drill = 1st Bid Letting 2nd Fire Drill = 1st PII Reports completed Fire-Drill Aversion leads to Training and knowledge gathering Calming effect - Once all stake-holders up to speed Slide 4

5. Prepare, Train, and Educate Prepare DOT/Muni. Inspection & Evaluation Team NASSCO PACP Subcontractors Educate Installers Prepare All Stakeholders on PII Eval. Process (who what when where?) Standard PII Report Format Slide 5

6. Inspection Team Preparation • Trained on Proper Use of Inspection Equipment • Proper Inspection Techniques & Issue Coding • NASSCO PACP Certification • Know Limitations • Provide thorough, • clear, quantifiable • information

7. Evaluation Team • DOT/Muni Specs. & AASHTO Guidelines • Differentiate Between • Cosmetic = Non-ISSUES • Minor Damage = Note but No Repair • Structural Issue = Evaluate Severity and determine if acceptable or what remedy required www.concrete-pipe.org

8. Tools for Evaluation “Post Installation Evaluation and Repair of Installed Reinforced Concrete Pipe” See Your Handout! www.concrete-pipe.org

9. Post Installation Evaluation and Repair of Installed Reinforced Concrete Pipe • Contents • Background on RCP Loads, Design, Structural Confirmation, & Joint Performance • Decision Matrix • Crack Eval. & Repair • Joint Eval. & Repair • Spalling and Slabbing Eval. & Repair • References & Supporting Documents www.concrete-pipe.org

10. Crack Evaluation Matrix • Consistent with AASHTO Guidelines • Acceptance Vs Repair • Must know location, orientation, & crack width www.concrete-pipe.org

11. Crack measurement Accuracy? Can you expect accurate measurements of cracks less than 0.05” in width? (Width of U.S. Dime = 0.05”) Slide 11

12. AASHTO LRFD Bridge Construction SpecificationSection 27.6.4 (Summary) • Crack < to 0.01” • These cracks are minor & OK • Crack between 0.01” and 0.10” • Evaluation required: is it detrimental and in a corrosive environment? (PH<5.5) • If non-corrosive or not detrimental – OK • If corrosive and detrimental – Seal crack • Crack > 0.10” • Evaluation required: is crack detrimental to structure? • If not detrimental – OK • If detrimental – repair and seal crack • If not repairable – remediate or replace Slide 12

13. Crack Matrix Allows user to quickly evaluate crack severity and determine if crack is detrimental or acceptable without repair. Follows AASHTO Guidance Be Prepared to see some cracking. Crack < 0.10” (width of two Dimes) = Generally Acceptable www.concrete-pipe.org

14. Joint Eval. Matrix www.concrete-pipe.org

15. Joint Matrix • Performance Expectation? • Leak Resistant, Silt Tight, Soil Tight • Joint Opening meet Manufacturers recommendations • Infiltration of soil? www.concrete-pipe.org

16. Joint Evaluation Accurate measurements Signs of infiltration Signs of soil migration www.concrete-pipe.org

17. Joints • Note any leaking joints • Evidence of soil migration through joint requires evaluation • Differential movement, cracks, spalls, improper gasket placement, movement or settlement to be noted Slide 17

18. Slabbing / Spalling Evaluation Matrix www.concrete-pipe.org

19. Spalling/Slabbing • Spalling • crack face edges • chipping at joint • No steel exposed = No Problem • Steel exposed needs repair • Slabbing – typically caused by Radial Tension Shear • Cracks 30 deg off invert • Slabs of concrete can become dislodged • Slabbing is repairable www.concrete-pipe.org

20. Conclusion – Avoid Fire Drills • Prepare DOT/Muni. Inspection & Evaluation Team • Obtain Clear and good Inspection Data • Develop Standard PII Report Format • Clear Evaluation Protocol – Utilize ACPA PII Eval. Manual • Educate Installers • Communicate PII Eval. Process to all Stakeholders www.concrete-pipe.org