Emulsion treated base as a stabilization practice

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EMULSION TREATED BASE AS A STABILIZATION PRACTICE Brett Haggerty, PE SAT Materials & Pavement Engineer

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Table of Contents

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Text Layouts

Tables

Box Layouts

Charts

Diagrams

Maps

Color Scheme and Useful Objects

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Emulsion Treated Base (EET)

Full Depth Reclamation process that combines emulsion, existing pavement

– Potential addition of add rock, additives (cement/lime/fly ash), water

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EET Process

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EET – Why should I be paying attention?

San Antonio Energy Sector:

– Need more structure

– Can’t raise the profile in most cases

– Limited TCP options

In general terms, looking for options that are:

– Cheap

– Fast

– Durable

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Cheap?

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Item (2013 project) Unit Price Unit Notes

Emulsion Treatment Existing (8in)

$4.06 SY

Emulsion $3.18 GAL 4 gal/sy

Subtotal (8in) $16.78 SY

Item (August 2015 low bid) Unit Price Unit Notes

Cement Treat Existing (8in) $1.78 SY

Cement $147.48 TON 3% typical application

Subtotal (8in) $3.57 SY

Item (August 2015 low bid) Unit Price Unit Notes

Remove 8in $2.44 SY

New Base $47.38 CY

Cement Treat New (8in) $1.64 SY

Cement $147.48 TON 3% typical application

Subtotal (8in) $15.95 SY

Item (August 2015 low bid) Unit Price Unit Notes

Remove 8in $2.44 SY

Type B (PG64-22) $62.38 TON

Subtotal (8in) $29.89 SY

Reclamation Replacement

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Cost/Speed Replacement costs did not include:

– Staging area issues

– Reduced lengths of construction that extend construction time

FDR becomes more appealing when addressing phasing

– EET allows for roadway to be open by end of the day

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Durability - stiffness

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Project District Seismic

Modulus (ksi, 1 day cure)

FWD Modulus (ksi, 2 day cure) Additives

SH16 San Antonio 262 N/A 5% emulsion

FM479 San Antonio

232 N/A 4% emulsion 1% cement

408 N/A 5% emulsion 2% cement

487* N/A 6% emulsion 2% cement

US287 Amarillo 291 207 6% emulsion 3% flyash

FM740 Dallas 360 N/A 4% emulsion 1% cement

* - 7 days after treatment

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Durability - Benefit

Shrinkage cracks not an issue, as compared to cement treatment with no micro-cracking

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San Antonio Most Recent Project

Frio County in the heart of Energy Sector

Let in July 2013

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SH85

Narrow roadway with high % of trucks

Can’t raise elevation a significant amount (flood plains), needed to keep open to traffic to prevent excessive cost for detours

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SH85

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SH85

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Good

Not So Good

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SH85

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Good

Not So Good

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SH85 Need to address fluctuation in base thickness

Iterative testing to optimize material modifications

– Increased emulsion content

– Added Cement

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SH85

Finished final surface at end of Summer 2014

Movie 1

Movie 2

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Questions

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