What is the purpose of lime stabilization in soils?

• A. Lower pH by adding acids
• B. Raise pH by neutralizing acidity
• C. Add nutrients like nitrogen
• D. Increase soil salinity

Answer: (B)

Lime stabilization focuses on raising the soil pH by neutralizing acidity. In acidic soils, excess hydrogen ions and soluble aluminum make the soil unstable and can harm both plants and construction performance. Adding lime introduces hydroxide and calcium ions, which neutralize H+ and reduce harmful Al3+ in the soil solution. As pH increases, clay particles tend to flocculate, improving soil structure, workability, and strength. The lime can also react with clay minerals to form cementitious compounds that bind particles together, giving the soil more stiffness and stability for engineering use. This isn’t about adding nutrients like nitrogen, nor about increasing salinity; the main goal is to neutralize acidity and improve soil properties through higher pH.