Caltrans I-40 Pavement Rehab & Shoulder Widening - Needles, CA
Pavement undulations, due to heaving, are a result of moisture content changes within the subsurface foundation soils. The 1.4 mi. section on Route 40 between Whale Mountain Bridge and Park Moabi Road Bridge incurred yearly maintenance fees by Caltrans in excess of $100,000 per year over the last 25 years.
After three other rehabilitations in the 1980’s and 1990’s, Caltrans engineers recommended cutting back existing 2:1 slopes and increased the shoulders lengths by 12 feet. Approximately 85,000 cubic yards of material were exported from the project to construct the new roadway.
Once removed, crews installed an impermeable PVC membrane below pavement that led to an edge drain. The finished paved shoulder was sloped at a 5-10% away from the roadway which allowed the sweeper to perform its duties in a safe manner.