What kind of material must be tested prior to use based on their stocks?

Testing materials prior to use is crucial to ensure quality and compliance with standards, especially when dealing with construction components. In the context of segregated stockpiles, these materials are set apart due to varying properties, nature, or sources. Therefore, conducting tests on materials in a segregated stockpile helps confirm that each specific batch meets the required specifications and is safe for use in construction projects.

Segregation typically indicates that the materials have been sorted for reasons such as differences in size, quality, or type, which could affect their performance. By testing these materials, quality assurance personnel can ensure that there are no inconsistencies that could lead to structural issues down the line.

Other options, while they can present their own challenges when it comes to testing and quality control, do not inherently carry the same necessity for testing based solely on their stock storage method. For example, frozen materials or pre-packaged materials might have different testing procedures but aren't intrinsically tied to the concept of segregation as a quality control measure.