If the concrete sample is to be consolidated by rodding, the measure is filled in how many layers?

When consolidating a concrete sample by rodding, the appropriate method involves filling the measure in three approximately equal layers. This technique ensures that the concrete is evenly compacted and that air pockets are minimized, which is crucial for obtaining an accurate measurement of the concrete's density and consistency.

By filling the measure in three layers, the first layer can be rodded to ensure proper consolidation and eliminate voids before adding the second layer. This process is continued with the third layer, contributing to a uniform density throughout the sample. Rodding each layer separately helps achieve a more accurate representation of the concrete's properties by thoroughly mixing and compacting the material.

Consolidation by rodding in this manner is an established practice in concrete testing, aligned with ASTM standards, ensuring that results are reliable and valid for quality control and assessment.