Which type of equipment is often used to mix the binders and graded soil before compaction?

• A. Rollers
• B. Pavers
• C. Excavators
• D. Stabilizers

Answer: (D)

Mixing binders with graded soil before compaction needs equipment that pulverizes the soil and blends in the cementitious material evenly. Stabilizers are designed for this job. They smash up the soil, mix in binders such as cement or lime (often with water), and produce a uniform stabilized base that’s ready to be compacted. This pre-mixing step strengthens the layer, controls strength and permeability, and helps prevent future settlement or erosion.

Rollers are used after the material is prepared to pack it down. Pavers lay asphalt or concrete surfaces, not mix binders into soil. Excavators dig, load, and move material, but don’t specialize in mixing binders with soil for stabilization.