AASHTO T 113-18 PDF Download

The AASHTO T 113-18 standard provides a procedure for determining the percentage of lightweight pieces in aggregate. This is achieved through sink-float separation in a heavy liquid with a specific gravity suitable for the purpose.

The standard outlines the process of separating lightweight particles from the aggregate by immersing the sample in a heavy liquid. The specific gravity of the liquid is chosen to allow the lightweight particles to float while the heavier particles sink. After a specified duration, the sample is removed from the liquid, and the floating and sinking fractions are collected separately for further analysis.

This test method is important in assessing the quality of aggregates used in construction projects, as the presence of lightweight particles can affect the strength and durability of concrete. By determining the percentage of lightweight particles, engineers and contractors can make informed decisions regarding the suitability of aggregates for specific applications.