Simulating moisture distribution within concrete pavement slabs: Model development and sensitivity study

Document Type

Article

Publication Date

1-1-2014

Abstract

This study simulates internal relative humidity (RH) distributions for in-service jointed plain concrete pavement slabs. A one-dimensional isothermal mass transport model is used to predict the concrete slab's RH distribution through its depth. At the top of the slab, a new statistical algorithm is applied to estimate the occurrences of drying and wetting cycles. During drying cycles, both local wind speed and ambient RH govern the slab surface's moisture convection. During the wetting cycle, the moisture at the surface is treated as a fixed saturated condition. The feasibility of this model is verified through laboratory observations of internal RH in concrete prisms as well as through field measurements of internal RH for an in-service concrete pavement. Using the developed model, predictions of internal RH distributions of in-service slabs are centered on their sensitivity to local weather conditions, including factors such as the ambient RH, wind speed, and rainfall, especially for slabs in arid regions. © 2013 RILEM.

Publication Title

Materials and Structures/Materiaux et Constructions

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