Mechanistic-Empirical Pavement Fatigue Calculator

Structural Durability & Fatigue Life: Compute critical bottom-of-layer tensile strain ($\varepsilon_t$), allowable repetitions ($N_f$), Miner’s damage index ($D$), and alligator cracking.

Pavement Structure & Strains

Bottom Tensile Strain $\varepsilon_t$ (µε):

Dynamic Modulus $E$ (ksi):

Design Traffic Passes $n$ (Millions):

AC Layer Thickness $h_{\text{ac}}$ (in):

Mix Volumetric Calibration

Effective Binder Volume $V_b$ (%):

Air Voids $V_a$ (%):

Perpetual Pavement Endurance Limit Mode:

Fatigue Life & Damage Index

Allowable Repetitions ($N_f$)

-- Million

-- cycles

Miner's Damage Index ($D$)

Failure Criterion: D = 1.00

Predicted Alligator Cracking

-- %

Target: < 10% lane area

Endurance Limit Status

Finite Fatigue Life

ε_t vs Limit

Mechanistic Calibration Factors:

• Volumetric parameter $M$: --

• Lab-to-field shift factor $C$: --

• Bottom-up fatigue cracking begins as microcracks at the AC bottom and propagates upward.

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Mechanistic-Empirical Pavement Fatigue Calculator

Pavement Structure & Strains

Mix Volumetric Calibration

Fatigue Life & Damage Index

Frequently Asked Questions