United States Department of Transportation
i
Maintenance of Roadway Edge Drop-Off Utilizing Readily Available Materials
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2023-01-01
[PDF-3.43 MB]
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Edition:Final Report 02/2019 – 09/2022
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Abstract:The Louisiana Department of Transportation and Development (DOTD) District 05, which is in the northeastern corner of the state, spent 55,000 hours and over $1 million in 2016 attempting to maintain roadway edges along non-paved shoulders. Non-paved shoulders consist primarily of a soil and aggregate mixture, which is routinely disturbed and lost under normal traffic conditions primarily at the paved roadway edge. This problem is more prevalent on narrow winding roadways where the wheel path meanders closer to the edge of the roadway. Tires disturb this material leaving a drop-off (edge rut) that requires continuous maintenance and can be unsafe to the traveling public. The means and methods used to maintain non-paved shoulders statewide varies with undocumented performance. Reclaimed asphalt pavement (RAP) is readily available and used in many areas of the state for shoulder repair. Some parish maintenance units use 100% RAP while others use a mixture of native soils blended to local proportions. Although RAP is common among DOTD district offices, it needs a binder to help stabilize the often-rounded aggregate particles within. In so, additives (such as cement, fly ash, soil, and asphalt emulsion) can improve RAP strength and stability. Mix 1 (75% RAP and 25% lean clay) with an additive of 4% to 6% cement was successful in both feasibility (amount of material utilized by volume) and performance (strength and durability of test samples).
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