Testing aggregates. Methods for determination of particle shape. Flakiness index

This technical specification establishes a standardized methodology for evaluating the shape characteristics of aggregate materials, specifically focusing on the flatness index. The procedure outlines precise steps for preparing test samples, ensuring that results reflect the true geometric properties of the particles under investigation. By defining specific measurement techniques and calculation formulas, it enables consistent assessment across various projects and laboratories. The standard details how to determine the proportion of flat particles within a given aggregate fraction, which is critical for understanding workability and compaction behavior in construction applications. It provides clear criteria for interpreting the data obtained from the tests, ensuring uniformity in the evaluation process. The methodology described is applicable to a wide range of aggregate sizes, facilitating comprehensive quality control during material selection and processing. Adherence to this document ensures that engineers and technicians can rely on comparable results when assessing aggregate suitability for specific engineering requirements. The text emphasizes the importance of accurate sample preparation and careful execution of the testing protocol to achieve reliable and reproducible outcomes in the assessment of particle shape.