Pavement Maintenance & Reconstruction: “Critical Quality Control”

Kevin McGlumphy, P.E. – Road Science Div of AMCCBob Siffert – Asphalt Paving Systems (APS)

Quality Control Starts with GOOD Project Selection…

“Right Road, Right Treatment, Right Time”

Quality Control for Dummies (and/or Engineers)…

1. Make sure your specifications are FAIR and

PERFORMANCE DRIVEN.

2. Plan on ENFORCING the specifications.

3. Verify design values and emulsion properties.

4. A properly trained inspection team is critical.

5. 80% of QC happens when inspector SHOWS UP!

6. Other 20% happens if inspector Stays All Day.

Quality Control for Engineers (and/or Dummies)…

7. Require an EXPERIENCED contractor.

8. Calculate yields road-by-road.

9. Make sure proper surface prep is done.

10. Monitor the quality and the quantity of all

materials that come to the job.

~Don’t count a process out just because you

“heard it failed” for someone else.

Micro-Surfacing

Critical QC for Micro-Surfacing1. Mix Design

a. Right Aggregate? b. Right Emulsion?c. Right Additives?

2. Machine Calibration a. “Counting Clicks”

Critical QC for Micro Surfacing

4. Residual AC Content

5. Return to Traffic:

a. 30-60 min

3. Application Rates

a. Singles: 18-22 lbs/SY

b. Doubles: 28-32 lbs/SY

Critical QC for Micro Surfacing

Micro Surfacing Discussion…

Chip Seal / Surface Treatment

Chip Seal Types

Single Chip Seal

Double Chip Seal

Cape Seal

Critical QC for Chip Seal

1.Emulsion Shot Rate

2. Aggregate Spread Rate

Critical QC for Chip Seal

4. Ambient Temp?

5. Clean Stone?

6. Emulsion Properties?

3. Distance between Distributer & Spreader?

Chip Seal Discussion…

Cold In-Place Recycling & Full Depth Reclamation

Critical QC for CIR & FDR1. Subsurface investigation & mix design 2. Verify design and materials.3. Project Selection – FDR or CIR? 4. Monitor additives during stabilization – CHECK YIELDS

Critical QC for FDR & CIR

5. Compaction effort & moisture content.

6. Rebuild to proper grades & elevations.

7. Check the cutting depth often.

FDR & CIR Discussion…

Question & Answer Session