Why is it important to test volcanic and organic aggregates?

Testing volcanic and organic aggregates is crucial because they possess unique properties that can significantly affect the performance of concrete and asphalt mixtures. Volcanic aggregates, for instance, can have a high porosity or specific chemical compositions that alter the strength, durability, and workability of the mix. Similarly, organic aggregates may introduce contaminants that affect the bonding of cement and the overall stability of the concrete structure.

Understanding these unique characteristics through testing ensures that the materials meet required specifications and performance standards for specific applications. This evaluation can help identify potential issues such as alkali-silica reactivity or excessive moisture absorption that could compromise the integrity of the final product. Proper testing allows for informed decisions in material selection and mix design, ultimately leading to safer and more durable construction outcomes.