What is the purpose of the gauge reading during straight edge calibration?

The purpose of the gauge reading during straight edge calibration is to ensure that the straight edge is set accurately for proper measurements. Calibration is essential because it verifies that the straight edge, which is used to assess the flatness and smoothness of the pavement, is providing reliable results. An accurate calibration means that any readings taken afterward can be trusted to reflect the true condition of the surface being evaluated, which is critical for maintaining quality control in paving operations.

By calibrating the straight edge with precise gauge readings, workers can identify any deviations or imperfections in the pavement surface, assisting in the achievement of required specifications and improving overall pavement performance.