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LUNA ROAD EXTENSION

Luna Road is a major arterial in the northwestern Dallas area which now connects with Old Denton Road via an extension project which added a new segment of six lane highway and an overpass above Interstate 35E Freeway. This construction project (TxDOT CSJ 8037-18-002) presented a classic soil stabilization challenge. Alignment requirements dictated construction through a wetland area and water ponds created by gravel mining operations. Pavement designers were forced to plan for construction of a tall embankment over saturated ground conditions. Once constructed, the embankment would be subjected to deeply ponded water on both sides. Controlling moisture content within the embankment was a concern due to the risk of volume change and differential settlement in the highly moisture susceptible expansive clay soils.

After reviewing the recently completed research study conducted at the Texas Transportation Institute (TTI) under the direction of Dr. Robert Lytton, design engineers made the decision to stabilize two different layers with EMC SQUARED® System applications. The first stabilized layer was constructed just above the elevation of the ponded water. The second stabilized layer was constructed at the top of the embankment (the actual pavement subgrade). The intent was to provide stable construction work platforms and to partially encapsulate the layer of untreated embankment soils between the two stabilized moisture barrier layers. As an additional response to the ponded water, they specified placement of a rock riprap cover to protect the embankment slopes against wave attack.


ACCORDING TO THE REPORT OF THE TXDOT DALLAS DISTRICT OFFICE

Even with the abundance of water along this roadway, no distress is evident in the pavement and the ride quality is very smooth. The conclusion could be drawn here is that the EMC SQUARED System treatment is effective in reducing and/or preventing water from entering the embankment

MOISTURE BARRIER PERFORMANCE

For highway engineers who have previously asked the question as to how well an EMC SQUARED System moisture barrier would perform with a lateral source of water ponded against the embankment below the moisture barrier, the Luna Road Extension project clearly answers this question with successful performance.

Soil stability, at its essence, has water as its common denominator. The engineering properties of any soil material are governed by variations in water content. The most direct and cost-effective route to stabilizing a soil is to stabilize its moisture content. This is the most fundamental benefit offered by the EMC SQUARED System in treatment of expansive clay soils. When moisture content in subgrade and embankment soils is maintained in a “near optimum” state, the soil platform is unaffected by volume change (expansion and shrinkage) and provides consistent support for the pavement. Key to this approach to stability is the selection of product technology that reduces soil moisture susceptibility and improves moisture barrier performance. This is not a benefit normally offered by cement, fly ash or lime treatment. TxDOT and other state transportation agencies have previously used plastic liners with some success to encapsulate expansive soils to control volume change, but the cost and complexities during construction were prohibitive. As indicated in the TTI research study, and verified in the field monitoring, the EMC SQUARED System treatment is performing well as a moisture barrier. The additional good news - it’s more economical and faster to apply than lime treatment.

 

Soil Stabilization Products, Inc.
PO Box 2779
Merced, CA 95344

Toll Free: (800) 523-9992
Phone:     (209) 383-3296

Fax: (209) 383-7849

Email: INFO@SSPCO.COM

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