Soil cement is a method to create a stabilized base course for a roadway. It is usually a mixture of Type D Borrow, Portland cement, and water. The goal is not to create concrete, which would be on the order of 3,000 psi; instead, a typical target is ~500 psi, sufficient as a durable base course for a roadway.
After a stabilized subgrade (in this case, soil cement) is placed and compacted, a permeable drainage layer is desired before placing the surface pavement (in this case, 12" Portland cement concrete). For US 301, six inches of soil cement were followed by four inches of permeable treated base (PTB).
US 301 in Delaware was constructed over a 3-year period using seven contracts, in addition to advance clearing, tolling, and landscaping. It extends from the Maryland /Delaware State Line to State Route 1, and was opened to traffic on January 10, 2019. It is a 14-mile limited access highway with four interchanges, 28 bridges, and an all-electronic tolling (AET) system.
The Delaware T2/LTAP Center provides direct technical assistance, training, and technology transfer to Delaware local agencies relative to their transportation challenges.
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