What is the specified size of the tamping rod used in tamping concrete samples?

The specified size of the tamping rod used in tamping concrete samples is 16 mm in diameter and 610 mm in length. This particular size is stipulated to ensure uniformity in compaction across different tests and to comply with standardized testing procedures outlined by organizations such as ASTM (American Society for Testing and Materials).

The diameter of 16 mm allows for effective penetration and compaction of the concrete mix, promoting a homogenous and representative sample. Additionally, the length of 610 mm is long enough to facilitate proper tamping action without causing unnecessary disturbance at the base of the sample container. This standardization is crucial for obtaining consistent and reliable results in concrete testing, enabling engineers to assess the concrete's properties accurately and adhere to quality control measures.

Using a tampering rod of other dimensions may not provide the same level of consistency or could lead to variations in the test results, which is why the 16 mm x 610 mm specification is adopted in industry standards.