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Www.dot.state.pa.us District 8-0 Winter Schools 2012 102/23/2012.

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Presentation on theme: "Www.dot.state.pa.us District 8-0 Winter Schools 2012 102/23/2012."— Presentation transcript:

1 District 8-0 Winter Schools /23/2012

2 District 8-0 Winter Schools 2012 Construction Quality Assurance Section is part of the Bureau of Project Deliver’s Innovation and Support Division –Made up of 33 People –Process to Independently Verify the Acceptance Practices on Projects –Quality Assurance is Required by Federal Law for Project Oversight (23 CFR 637 Mandated Independent Oversight to Keep the Federal Dollars Flowing) –Reviews Were the Focus Reactive – We Caught You 2 What is Quality Assurance (Q.A.) 02/23/2012

3 District 8-0 Quality Assurance Team 3 Joseph Cribben, P.E. Civil Engineer Manager (717) Office (717) Cell Linda Atkinson Sr. Civil Engineer (717) Office (717) Cell Terry Kohler TCM-II (717) Office (717) Cell Matt McSweeney Civil Engineer (717) Office (717) Cell 02/23/2012

4 Daniel R. Grosser Dist. 1-0 & 11-0 Garth D. Bridenbaugh, P.E. Dist. 2-0 & 9-0 David L. Jarvis, P.E. Dist & 12 District 8-0 Winter Schools /23/20124

5 District 8-0 Winter Schools 2012 Philip J. Micklitsch, P.E. Dist. 3-0 Christopher J. Cepko, P.E. Dist. 4-0 & 5-0 Joseph G. Oswald Dist. 6-0 Joseph F. Cribben, P.E. Dist /23/20125

6 District 8-0 Winter Schools 2012 Current Direction –Provide Support to the Districts –Be Proactive –Have a Positive Impact on Quality of Construction and Materials 6 What is Quality Assurance (Q.A.) 02/23/2012

7 District 8-0 Winter Schools 2012 The Hit List –Q. A. Field Reviews –Independent Assurance –District Support and Problem Resolution –Provide and Receive Training –Evaluate Supplier Performance 7 What is Quality Assurance (Q.A.) 02/23/2012

8 District 8-0 Winter Schools 2012 Q.A. Field Reviews –Specific Plan for Each District Plan Changes Each Year Based on the Previous Years Findings –Minimum of 30 IA & 60 QA Reviews per District Based on FHWA Agreement –Focus Areas NPDES Permits on all Projects Municipal Projects (5 year) ADA Ramps (3 Year) Labor Compliance (3 Year) M & P of Traffic (3 Year) Labor Compliance (3 Year) 8 What is Quality Assurance (Q.A.) 02/23/2012

9 District 8-0 Winter Schools 2012 Independent Assurance (I.A.) –Evaluation of the Acceptance Testing Personal and Equipment –Acceptance Test and IA Test Results Must Be Within the prescribed Tolerances –Discrepancies Need to Be Addressed With FHWA –Bituminous, Concrete, and Aggregates 10 Reviews in Each Area 9 What is Quality Assurance (Q.A.) 02/23/2012

10 District 8-0 Winter Schools 2012 District Support –Attend and Assist in Pre-Deck Placement, Pre-Pave, Pre- Erection, Pre-Demo, and Pre-Construction Meetings –Work as a Team to Address Problems –Work with Inexperienced Inspectors –Resource in Spec & policy Interpretation –Assist on Deck Placements and Paving Operations 10 What is Quality Assurance (Q.A.) 02/23/2012

11 District 8-0 Winter Schools 2012 Develop and Evaluate Specs and Policies –Listen to the District on What is a Problem –Revise the Spec & Policies to Enhance Quality or Make the Process Easier –Focus on Statewide Issues Joint Density Spec Concrete Cylinder Security Work Plan Developed Every Year 11 What is Quality Assurance (Q.A.) 02/23/2012

12 District 8-0 Winter Schools 2012 Provide and Receive Training –Large Turnover of Construction People –After the Fact WRR Doesn’t Improve Quality –Explain What is Required On the Job Training Winter Schools One on One Help Provide Training to Industry Personnel 12 What is Quality Assurance (Q.A.) 02/23/2012

13 District 8-0 Winter Schools 2012 Evaluate Supplier Performance –Many Reviews on Superior Suppliers Adds No Value –Determine Who is Always in Spec and Who Isn’t –Focus Efforts on Suppliers with Past Performance Issues –Perform a Review Each Source a Minimum of Once every 5 Years 13 What is Quality Assurance (Q.A.) 02/23/2012

14 District 8-0 Winter Schools 2012 We Are Here To Help!!! 1402/23/2012

15 PUB. 408/2011 Section 460 Bituminous Tack Coat District 8-0 Winter Schools /23/2012

16 Poor Tack Coat Application District 8-0 Winter Schools /23/2012

17 Bad vs. Good 1702/23/2012 District 8-0 Winter Schools 2012

18 Bituminous Tack Coat Purpose –To ensure a bond between the existing pavement surface and the new asphalt overlay by leaving an asphalt residue of between 0.02 to 0.07 Gal / SY. If a good bond is not formed, a slipping or sliding-type failure can easily occur. District 8-0 Winter Schools /23/2012

19 Spray Bar and Nozzles Things to check –Spray bar nozzles are “FOG” or 1/16” slot nozzles This can be checked with a dime and a nickel. A dime will fit in the slot and a nickel will NOT. –Spray bar nozzles are at the proper angle Nozzle slot should be at 30 o angle from the spray bar –Are spray nozzles plugged –Are spray nozzles leaking while tack is heated –Spray bar at the correct height and angle Spray bar should be 12” from road surface Spray bar should be at an angle that allows the nozzles to be 100 o to 105 o from the road surface District 8-0 Winter Schools /23/2012

20 Bituminous Tack Coat Things to Check –The air temperature is 40°F and rising –The existing surface is dry –The emulsion is brown, will turn black when the water evaporates –All vertical edges should be covered with two applications –Assure the spray pattern is uniform, with no gaps, bare areas, puddles or streaks District 8-0 Winter Schools /23/2012

21 Bituminous Tack Coat Things to check –Tack material has been allowed to dry or set up before paving, especially on concrete. – Keep trucks from driving on the tack coat as much as possible. –Keep trucks from tracking tack into areas not tacked. –The spray pattern should be 6” – 12” wider than the paving pass. District 8-0 Winter Schools /23/2012

22 Bituminous Tack Coat Asphalt Residue Content –The Asphalt Residue must be between 0.02 and 0.07 Gal / SY On polished or smooth concrete surfaces, new base or binder courses that may have become dusty, apply on the low side. On milled surfaces, apply at a higher rate. Remember, too much tack is as detrimental as too little. Can cause bleeding or act as a lubricant allowing the hot mat to shove in front of the roller. Remember, too much tack is as detrimental as too little. Can cause bleeding or act as a lubricant allowing the hot mat to shove in front of the roller. District 8-0 Winter Schools /23/2012

23 Bill of Lading District 8-0 Winter Schools /23/2012

24 Asphalt % By Weight and Spray Temperatures District 8-0 Winter Schools /23/2012 Spray Temperatures

25 Asphalt % By Weight and Spray Temperatures District 8-0 Winter Schools /23/2012 % Asphalt Content

26 District 8-0 Winter Schools /23/2012

27 District 8-0 Winter Schools /23/2012

28 District 8-0 Winter Schools 2012 Questions or Comments ? 2802/23/2012


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