Mt. Zion Township, Illinois
This oil and chip roadway in a rural subdivision was constructed with sub-standard materials consisting of asphalt millings, recycled base rock and waste rock. The roadway had numerous failures due to this under-designed pavement structure. Funding was not available for total reconstruction. The road was the only entry to the subdivision and needed to be kept open to traffic at all times.
A 7-inch soil cement base stabilization incorporating the existing aggregate base and oil and chip surface with the underlying clay subgrade provided the necessary strength to support the anticipated traffic.
- Till existing roadway 6-inches deep incorporating existing base and surface material.
- Incorporate approximately 7 percent Portland cement by weight, add sufficient water to achieve optimum moisture and mix to a depth of 7 inches and compact to optimum density.
- Apply bituminous prime coat at one-half gallons/sy and allow to cure for 72 hours.
- Apply A-2 bituminous surface treatment with asphalt emulsion and crushed stone seal coat aggregate.
- Quality road requiring little maintenance for many years.
- Project completed within customer’s budget.
- Road kept open to traffic during entire project.