ASTM C294-19 PDF Download

ASTM C294-19 is a standard that provides a descriptive nomenclature for constituents of concrete aggregates. The goal of this standard is to assist in understanding the meaning and significance of the terms commonly used to describe concrete aggregates. The descriptions provided in this standard are meant to characterize both natural and artificial materials that make up mineral aggregates.

It is important to note that while the descriptions given in this standard serve as a basis for understanding the terms, the actual identification of rocks and minerals can only be accurately done by qualified professionals such as geologists, mineralogists, or petrographers using the appropriate apparatus and procedures. However, referring to these descriptions can help prevent gross errors in identification.

Furthermore, it is mentioned that while identifying the constituent materials in an aggregate can assist in characterizing its engineering properties, it is not sufficient to solely predict the behavior of aggregates in service. The performance of aggregates in concrete depends on various factors such as exposure conditions, the properties of the matrix, the physical condition of the aggregates, and more. Even minor constituents in an aggregate may or may not significantly influence its performance.

The standard also clarifies that it does not include descriptions of constituents used in radiation shielding concrete, as those are covered by a separate standard (Descriptive Nomenclature C638).