The following chart shows the dynamic modulus $(E^{**})$ of a HMA mixture at $70F.$

$2\mathrm{.}1)$ For an $8$ inches HMA layer, determine the time of loading and the dynamic modulus under a vehicle traveling at $30mph$ at depths of $1,3,$ and $5$ inches below the pavement surface $($use the sinusoidal pulse load$).$ Determine the average dynamic modulus value.

FIGURE $7\mathrm{.}3$

Vertical stress pulse time under haversine or triangular loading $(1$ in$.=25\mathrm{.}4mm\mathrm{.}1mph=1\mathrm{.}6k\frac{m}{h}).$ After Barksdale $(1971).)$

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