Highway Engineering Practice Test: Soil Stabilized Roads — Flashcards

Soil Stabilized Roads topics include: Soil stabilized roads, mechanical soil stabilization, soil cement and soil lime stabilization, soil stabilization using bituminous materials and soil stabilization special problems.

Soil stabilization is a technique for improving the quality of soil for road construction. Soil-stabilized roads require less maintenance and don't have problems like potholes, rutting, and mudding. 

Here are some soil stabilization techniques:

Lime: Lime can be added to low-quality soils to create a usable base and sub-base. It can also be used as an anti-stripping additive for asphalt pavements. The amount of lime required depends on the type of soil:
Coarse-grained soils: 2–8% lime
Plastic soils: 5–8% lime

Cement: Cement stabilization is a common technique for stabilizing recycled road base material. It can also extend the life of the pavement.
Geotextiles: Geotextiles can be placed between the soil and construction material to prevent soil erosion and provide stability.
Polymer stabilization: Polymer soil stabilization uses a nano polymer technique that fills voids with polymers.
Aggrebind: Aggrebind uses no cement to create a water resistant bound layer of soil that is sealed at the surface.
Bituminous stabilization: Bituminous materials like tar and asphalt can improve soil stability while reducing water absorption quality. This means the soil doesn't erode easily, keeping the surface intact for longer. 

Other soil stabilization techniques include:
Admixture soil improvement
Polymer stabilization