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Soilworks products are the industry’s top standard due to our insistence on creating high performance soil stabilization and dust control products that stand up to rigorous testing – both in the lab and in the field. Our commitment to quality and performance has led to our involvement and testing in hundreds of real-world situations. The following library of reports, presentations, specifications, approvals and other similar documents provide you, our customer, the transparency and dependable assurance that is expected from Soilworks.

VDOT Use of Soil Stabilizers on Highway Shoulders (TPD0507012)

Summary

In a Virginia DOT field study prompted by the state legislature, Soiltac®, a synthetic copolymer emulsion by Soilworks, was evaluated for its effectiveness in stabilizing highway shoulders to prevent edge drop-off. The study compared Soiltac with other stabilizers including a soy/lecithin emulsion and magnesium chloride across multiple test sites with known shoulder degradation. While visual inspections suggested minor surface improvements, stiffness and bearing strength measurements using dynamic cone penetration and geogauge methods indicated no statistically significant benefit over untreated sections. However, the report acknowledged potential short-term erosion control value and recommended further evaluation of Soiltac for temporary surface stabilization, particularly in erosion-prone shoulder environments.

For transportation engineers and maintenance planners, Soilworks offers:

Soiltac®: A polymer-based surface treatment with potential erosion mitigation benefits on unpaved or transitional road shoulders

Flexibility in application methods for localized stabilization challenges

Field-tested performance that supports targeted use where long-term structural reinforcement is not the primary objective

For short-term shoulder protection or erosion-sensitive locations, contact Soilworks to explore Soiltac application strategies tailored for transportation infrastructure.

USE OF SOIL STABILIZERS ON HIGHWAY SHOULDERS

A presentation to JCOTS July 19, 2005

BACKGROUND: This study was undertaken at the behest of the General Assembly (2004 Budget Bill). Based on positive preliminary results using soil stabilizers on higher volume gravel roads, they felt soil stabilizers showed substantial promise to reduce the occurrence of shoulder drop-off at a reasonable cost.

PURPOSE: To study the use of soil stabilizers in highway shoulders with the objective of finding a method of substantially reducing the occurrence of pavement/shoulder drop-off at a reasonable cost.

RESEARCH PLAN:

  • Field study only, with no laboratory analysis or investigation.
  • At locations based on documented past experience with low shoulders.
  • Soil stabilizers from three groups: acrylics, soybean/soy lecithin, and salts.
    • Soiltac (vinyl acetate copolymer emulsion)
    • Centrophase AD (soy/lecithin emulsion)
    • Magnesium chloride (salt) –
  • Use test and control evaluation.

HYPOTHESES:

Working – The addition of stabilizers to the shoulder material did affect the strength of the material Null – The addition of stabilizers to the shoulder material did not affect the strength of the material

(as measured by its stiffness and bearing capacity)

 

DATA COLLECTION:

  • Dynamic Cone Penetration – Measures penetration and correlates to bearing strength
  • Geogauge – Measures stiffness or material’s resistance to movement.
  • Visual inspection

FINDINGS:

  • Statistically speaking, on no occasion were test section data better than the control section data
  • The February 8th data supports the visual inspection finding that the control section was firmer than either test section.
  • Overall, the data supported the null hypothesis

CONCLUSIONS:

  • Equipment normally used for road stabilization is not effective or efficient for stabilization of narrow shoulders.
  • Soil stabilizers mixed with crusher run stone do not increase the stiffness or bearing strength of the material or prolong the period of optimum stiffness and bearing strength.
  • There is insufficient evidence to determine if soil stabilizers improve a shoulder’s short-term resistance to erosion due to the action of water or traffic.
  • The cost of using soil stabilizers as short-term surface stabilizers for crusher run stone shoulders is greater than the benefit received.

RECOMMENDATIONS:

  • Shoulders should be designed for the anticipated traffic load.
  • Soil stabilizers should not be used with crushed stone with the intent of improving or prolonging the CBR of shoulder material.
  • Consider additional study of soil stabilizers as a short-term solution to shoulder erosion.

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Control Section

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Soiltac-treated Section

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Centrophase-treated Section

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Entrance 2/8/2005

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DCP Penetration Readings for Sample C-6, by Date

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DCP Penetration Data 2/8/2005

VDOTUse of Soil Stabilizers on Highway Shoulders (downloadable PDF)

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