What is the main purpose of a Statistical QC/QA Program?

• A. Reducing project scope
• B. Production of more consistent, higher quality HMA
• C. Accelerating project deadlines
• D. Increasing contractor profits

Answer: (B)

Statistical QC/QA programs use data to control the asphalt production process and verify that the produced HMA meets specifications. By sampling and testing key properties and tracking results over time, crews can detect when the process drifts and adjust materials, temperatures, or mixing times to bring output back into target ranges. The goal is to reduce variability and produce a consistent, high-quality product rather than tolerating wide swings in quality. When the process is well-controlled, each lot behaves more predictably in the field, leading to durable pavements and fewer costly reworks. While faster schedules or higher profits might seem attractive, they aren’t the purpose of a Statistical QC/QA program—the emphasis is on consistency and quality of the HMA.