What is the maximum particle size allowed in test method D1140?

In test method D1140, which is used to determine the specific gravity and absorption of coarse aggregates using a water displacement method, the maximum particle size allowed is 75 mm (3 inches). This specification ensures that the test can be performed accurately, as larger aggregates would make it challenging to measure the water displacement accurately and could lead to inconsistent results.

Smaller aggregate sizes would fall within the acceptable range for the test method but would not align with the requirements established for optimal testing. This standard helps maintain uniformity and reliability in test conditions, ensuring that the results can be replicated and compared effectively across various samples.