A portland cement concrete pavement (PCCP) moisture model and associated program are developed for enhancing the FHWA HIPERPAV software predictions. This model predicts PCCP moisture transport and moisture loss to the environment due to drying and self-desiccation. The former is simulated in terms of Fick's second law; the second part is based on Oh and Cha's model. The one-dimensional Crank–Nicolson finite difference method is used to build the mathematical algorithm for solution. FORTRAN coding is developed to program this computational procedure and incorporate the moisture model into the HIPERPAV software. The moisture model has been partially validated with other researchers’ experimental data. Results showed reasonable agreement between predictions and measurements. A sensitivity analysis shows that parameters such as the diffusivity coefficient, surface emissivity, and curing method affect moisture variations, especially at positions close to the surface and the bottom of the slab. Future research will focus on simulations of PCCP critical stresses and distresses with this enhanced moisture model.
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