Simple Performance Tests: Summary of Recommended Methods and Database (2006) / Chapter Skim
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σ ε σ ε σ ω ε ω φ ω ω φ 0 0 0 0 ) 2 dynamic modulus testing of HMA is normally conducted using a uniaxially applied sinusoidal stress pattern as shown in Figure 1.
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| = dynamic modulus, 105 psi η = binder viscosity at the age and temperature of interest, 106 Poise f = loading frequency, Hz Va = air void content, % Vbeff = effective binder content, % by volume ρ34 = cumulative % retained on 19-mm sieve ρ38 = cumulative % retained on 9.5-mm sieve ρ4 = cumulative % retained on 4.76-mm sieve ρ200 = % passing 0.075-mm sieve The Witczak predictive equation (Equation 8) can be presented in the same form as Equation 3 for a mixture-specific master curve as follows: (Eq.
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In the primary zone, permanent deformations accumulate rapidly. The incremental permanent deformations decrease reaching a constant value in the secondary zone.
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Permanent deformation parameters α and μ and the flow number.
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