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Intelligent Compaction. Understanding the Technology. Jimmy Si, Ph.D., P.E. Austin, TX, April 3, 2014. Table of Contents. 1. Why Use Intelligent Compaction. 3-5. 2. TXDOT IC Projects. 6-9. 3. Benefits and Challenges. 10 -11. 4. Future Plans. 12. 5. Summary. 13. Why Use IC?.

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intelligent compaction

Intelligent Compaction

Understanding the Technology

Jimmy Si, Ph.D., P.E. Austin, TX, April 3, 2014

table of contents
Table of Contents

1

Why Use Intelligent Compaction

3-5

2

TXDOT IC Projects

6-9

3

Benefits and Challenges

10-11

4

Future Plans

12

5

Summary

13

slide3

Why Use IC?

Ordinary Compaction

Density Control

  • CompactiveEnergy
  • Moisture Content
  • Material Type
  • Compact Lift Thickness
  • Underlying Conditions
why use ic
Why Use IC?

Can We Do A Better Job?

Not used in pavement design

A layer-specific spot test providing no info on the uniformity of compaction over the entire section

Only measured after compaction is complete providing no feedback in real time

why use ic1

Before

After

Why Use IC?
  • Lose the track of rolling pass counts
    • Compaction job becomes guesswork
    • Inconsistent and non-uniform density
    • Under/over compaction
    • Premature pavement failure
txdot ic projects
TxDOT IC Projects

Fort Worth (7)

FM156; US287 ; FM1938; FM731; SH267; IH35W; andIH30

Amarillo (1)

LP335

Paris (2)

US75

SH24

El Paso (1)

FM1281

Atlanta (1)

FM450

Houston (1)

SH35

slide7

FM156 Project

Dynapacsingle

smooth drum IC roller

Ammann/Case

smooth drum IC roller

Ammann/Case

padfoot drum IC roller

FM156, Fort Worth, TX

FHWA/TPF IC Study

SG, Lime Stabilized SG, and Flex Base

k s shows compaction progress and a soft s pot

FM156 Project – Identify Soft Spots

Ks shows compaction progress and a soft spot

Case/Ammann

single-drum

padfoot IC roller

Screen shots of kSΙPD maps for different passes on TB 1

benefits
Benefits
  • Covers 100% of the area compacted
  • Monitors pass counts
  • Identifies areas of poor compaction
  • Intelligently picks areas to test for QC/QA
  • Improves productivity and minimizes cost
  • Improves safety in construction zones
slide11

Challenges

Extensive training for DOT and contractors

  • FHWA training workshops

Data management difficulties

  • VEDA

More expensive than ordinary

  • IC retrofit kit

High moisture variation

No strong correlation b/w stiffness and density

future p lans
Future Plans
  • Workshops/Webinars and pilot projects in districts
  • Revise IC specification
        • Short Term: density based on IC proof mapping
        • Long Term: stiffness based on IC proof mapping
summary
Summary

IC is a continuous compaction control process.

IC is only for QC so far.

IC measures stiffness, not density.

IC reports both stiffness and pass count.

IC does not measure moisture.

IC measurements are sensitive to moisture.

IC improves safety in construction zones.

questions

Thank You!

Questions?

Jimmy Si, Ph.D., P.E.

512-506-5901

[email protected]

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