ASTM C702/C702M-18 PDF Download

The ASTM C702/C702M-18 standard provides guidelines for obtaining representative portions of aggregate material for testing. It emphasizes the importance of acquiring larger samples, as they tend to be more representative of the total supply. The standard outlines procedures to reduce the large sample obtained in the field or produced in the laboratory to a convenient size for conducting various descriptive and quality tests.

Following the procedures in this practice is crucial to ensure that non-representative samples are not used in subsequent testing. Each individual test method specifies the minimum amount of material to be tested. However, there are certain circumstances where reducing the sample size prior to testing is not recommended. For example, if the aggregate has few large size particles or if the test sample is being examined for contaminants occurring in small percentages, caution should be exercised in interpreting results from the reduced size test sample. In these cases, it is advisable to test the entire original sample to obtain accurate and reliable results.