What is the purpose of using barium sulfate in density tests?

The use of barium sulfate in density tests is primarily to provide a means of measuring the density of soil samples while minimizing the effects of moisture. Barium sulfate is a non-hygroscopic substance, which means it does not absorb moisture from the environment, making it an ideal choice when conducting density tests. By using barium sulfate, inspectors can achieve more accurate results since the density measurements are not affected by variations in the moisture content of the soil. This is particularly important in soil testing, where moisture can dramatically influence the results.

In the context of soil density tests, having a consistent and reliable method to assess density without the interference of moisture is crucial for understanding the soil's properties and behavior under load, thus allowing for better decision-making in construction and engineering applications.