Arno Hefer Administrator Posts: 18 1/20/2021

Arno Hefer Administrator Posts: 18 The following figure shows a deviation of the measured deflection at the 200 mm offset from the expected deflection bowl (green line). This phenomenon is typically observed in FWD measurements recorded on highly flexible pavements. This error occurs due to the positioning of the sensor at the 200 mm offset close to the edge of the load plate; essentially the result of a stress wave induced by the impact load and non-uniform stress distribution under the relatively rigid load plate, with higher stress intensity towards the plate edge. Recommendations on deflection analysis where deviation of the deflection at the 200 mm offset is present: Deflection bowl parameters: Deflection based parameters that rely on the deflection at the 200 mm offset, such as the Radius of Curvature, should be interpreted and used with caution where this phenomenon occurs. Backcalculation: When fitting the theoretical deflection bowl, the process should focus on the adjacent sensors while ignoring the deflection recorded at the 200 mm offset. edited by on 1/20/2021 edited by on 1/20/2021 edited by on 1/27/2021

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