01334127

Component

https://doi.org/10.3141/2240-02

http://scholar.google.com...nsen&publication_year=2011

Many aspects of concrete durability and performance are influenced by moisture conditions in concrete. Although the importance of moisture effect on concrete pavement has been widely recognized, moisture deformations and stresses were usually ignored in pavement analysis because of a lack of comprehensive understanding of moisture transport properties and difficulties in characterizing their magnitudes. Three moisture transport processes and their effects on internal relative humidity distributions along slab depth, thought to be the major factors affecting concrete pavement deformations and stresses, are discussed. The processes are drying shrinkage and associated nonuniform humidity distribution within the top few inches of a slab, self-desiccation caused by hydration and associated uniform humidity distribution within the entire slab cross section, and water absorption caused by capillary suction and associated nonuniform humidity distribution within the bottom portion of the slab. Experiments and simulations showed that the total humidity loss was a result of self-desiccation and external drying; excessive warping in jointed concrete pavement was caused by simultaneous top surface drying and bottom surface water absorption. Pore discontinuity caused capillary suction at the bottom surface to produce a steep moisture gradient and associated moisture warping. A new methodology was proposed for characterizing moisture-related deformations in slab on ground on the basis of a relationship of shrinkage versus relative pore humidity for concrete. This relationship was obtained from autogenous shrinkage results, which related free shrinkage deformations of a concrete to its internal humidity volumetric aggregate concentration. The proposed methodology provides for a simple postprocessing of moisture-related deformations in slabs on grade.

01361506

11-0447

English

pp 9-15

2011

Transportation Research Record: Journal of the Transportation Research Board

9780309167581

Print

Figures (9) ; References (27)

Concrete pavements; Deformation; Drying; Durability; Humidity; Hydration; Moisture content; Shrinkage

Moisture transport properties; Warping; Water absorption

Highways; Materials; Pavements; I23: Properties of Road Surfaces; I32: Concrete

TRIS, TRB, ATRI

Feb 17 2011 5:26PM

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