What factors should be identified when sampling aggregates?

The correct response highlights essential characteristics that are crucial when sampling aggregates.

Size is significant because it impacts the properties of the aggregate and how it will perform in construction applications. Different sizes can influence the workability, strength, and durability of the final product.

Shape is also important as it affects the aggregate’s packing efficiency, which can lead to differences in the mechanical strengths of the resultant concrete or asphalt mixes. For instance, rounded aggregates may yield different results than angular aggregates in terms of bonding and compaction.

Gradation refers to the distribution of particle sizes within an aggregate sample. Proper gradation is essential for achieving desired performance characteristics in concrete and asphalt mixes. It ensures that the aggregates fit together well, minimizing voids and maximizing density.

Lastly, moisture content is a critical factor, as it can affect the weight and characteristics of aggregates. Moisture levels determine how aggregates interact with binders like cement or asphalt and can influence the curing process and final strength of the mixture.

In contrast, while weight, moisture content, and contamination might be somewhat relevant, they do not encompass the full scope of aggregate characteristics necessary for performance analysis in construction. Other factors like temperature and compaction mentioned in different answers are more related to site conditions and end-use rather than