Welcome to the National Transport Library Catalogue

Normal view MARC view

Moisture Transport Model for Enhancing FHWA HIPERPAV Predictions Xu, Qinwu ; Ruiz, Mauricio ; Chang, George K ; Rasmussen, Robert Otto ; Rozycki, Dan K

By: Contributor(s): Series: ; 2113Publication details: Washington DC Transportation Research Record: Journal of the Transportation Research Board, 2009Description: s. 1-12ISBN:
  • 9780309126274
Other title:
Subject(s): Bibl.nr: VTI P8167:2113Location: Abstract: 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.
Item type: Reports, conferences, monographs
Holdings
Cover image Item type Current library Home library Collection Shelving location Call number Materials specified Vol info URL Copy number Status Notes Date due Barcode Item holds Item hold queue priority Course reserves
Statens väg- och transportforskningsinstitut Available

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.