What is the formula for calculating % passing of aggregates?

The formula for calculating the percentage of aggregates that pass through a certain sieve is represented by the expression 100 minus the ratio of the weight retained to the extracted aggregate weight, multiplied by 100. This calculation focuses on determining how much of the material is considered to pass through the desired sieve opening, which is essential for understanding the aggregate grading and ensuring it meets specified design requirements.

In this case, "Weight Retained" refers to the mass of the aggregate that did not pass through the sieve, while "Extracted Agg" represents the total mass of aggregate used in the test. By subtracting the fraction of the retained aggregate from 100, you quantify the proportion that did pass, providing a clear assessment of the aggregate's size distribution relative to the specifications required for asphalt mixture performance.

This method is vital for quality control in asphalt production, as the aggregate gradation significantly influences the mixture's performance characteristics. A well-graded aggregate will ensure optimal compaction, stability, and durability of the asphalt pavement.

The other formulas presented do not accurately reflect the calculation of percentages concerning aggregates passing through sieves, thereby reinforcing the importance of this particular equation in aggregate analysis.