Florida DOT Concrete Batchman/Operator Practice Exam

What equation is used to determine Adjusted Aggregate Weight?

1. (SSD aggregate weight) * (Free Moisture Numeric Value + 1)

2. (SSD aggregate weight) / (Free Moisture Numeric Value + 1)

3. (Batch water) + (Aggregate free moisture water weight)

4. (Batch water) - (Aggregate free moisture water weight)

The correct answer is: (SSD aggregate weight) * (Free Moisture Numeric Value + 1)

The equation used to determine Adjusted Aggregate Weight takes into account the Saturated Surface Dry (SSD) condition of the aggregate and the amount of free moisture present. In this context, the correct relationship to calculate Adjusted Aggregate Weight involves the SSD aggregate weight multiplied by the sum of the Free Moisture Numeric Value and 1. When aggregates are in SSD condition, they contain both absorbed water and some moisture that is free on the surface. The Free Moisture Numeric Value represents how much additional moisture is present beyond the SSD condition. By adding 1 to this value, we effectively adjust the aggregate weight to account for this extra moisture. This ensures that the overall mixture proportions remain accurate for achieving desired concrete strength and durability. The other options do not correctly represent how the adjusted weight should be calculated in relation to the free moisture present. For instance, option B divides rather than multiplies, which would yield an incorrect weight. Options C and D focus on water adjustments rather than the precise calculation for aggregates, leading them to miss the essential inclusion of the free moisture effect on aggregate weight.