What does C117 determine in the context of construction materials testing?

The standard C117 specifically addresses the determination of the amount of material finer than a 75-micrometer (μm) or No. 200 sieve in soil samples. This test is significant in construction materials testing because the amount of fine material in soil can influence its physical properties and behavior, such as permeability, plasticity, and compaction characteristics. Fine particles can also affect the stability and bearing capacity of the soil, which is crucial for the design and construction of foundations and other structures.

By quantifying the amount of finer particles, engineers and testers can better assess the suitability of soil for various applications, including road construction, earthworks, and other civil engineering projects. Understanding the gradation of soil, particularly determining how much of it is finer than the No. 200 sieve, helps in predicting how the soil will perform under different conditions and loads.