satisfactory curve is one which represents the overall
development of penetration resistance and includes points before and after
the times of initial and final setting to improve the accuracy of the required
interpolation. For normal setting mixtures, test points are usually at
equally spaced time intervals. Premature penetration testing will result in
too many data points earlier than the initial setting time. This may
decrease the accuracy of the estimated setting time by biasing the best fit
line when regression analysis is used to analyze the penetration resistance
data.
9.5 Plotting Test Results—One of the following alternative