How many consecutive failing density gauge control strips indicate a needed procedure adjustment?

A sequence of two consecutive failing density gauge control strips indicates that an adjustment to the procedure is necessary. The basis for this is grounded in quality control practices, where the detection of repeated failures suggests that there may be a consistent issue that needs attention. When only one failure is recorded, it might be a random occurrence or an isolated error, but two failures signal that there is likely a systematic problem requiring further investigation or adjustment.

By tracking performance with control strips, engineers and technicians can ensure that the results are accurate and reliable. This two-sample threshold serves as an early warning system, ensuring that corrective actions are taken promptly to maintain quality standards in construction and materials testing. Allowing for one failure could lead to larger issues going unaddressed, so establishing a clear threshold for procedural adjustments helps in maintaining the integrity of the project.