AASHTO M 216-21 PDF Download

The AASHTO M 216-21 standard is a specification that outlines the requirements for quicklime and hydrated lime used in soil stabilization. The specification covers different types of lime, including high calcium, dolomitic, and magnesian lime.

The purpose of using quicklime and hydrated lime in soil stabilization is to improve the load-bearing properties of clay soils, making them suitable for highway construction and other applications that require a strong foundation. The lime acts on the clay particles, causing them to agglomerate into larger particles, which enhances the soil's load-bearing capacity. Additionally, a chemical reaction occurs, leading to further hardening of the lime-treated soil.

It is important to note that this specification does not address by-product lime, commercial lime slurry, or similar materials. The requirements for these materials may vary depending on the local conditions and need to be determined separately.