Mapping Microstructural Drying Shrinkage Deformations in Cement-Based Materials. Part 3: Influence of Specific Drying Shrinkage Mechanisms
C M. Neubauer, Hamlin M. Jennings, Edward Garboczi
A new deformation mapping technique has been used to study the impact of specific drying shrinkage mechanisms in the deformation development of cement paste. In contrast to previous work, the relative humidity (RH) was decreased in gradual steps in order to try to understand the controlling mechanism at a given RH value. Above 80% RH, deformation development may be primarily due to surface porosity and microcracking, while between 80% and 55% RH, deformation development appears to be dominated by capillary porosity and is sensitive to the w/c ratio at a fixed curing age. Between 55% and 20% RH, the deformation appears to occur primarily in the C-S-H, probably due to Gibbs-Bangham shrinkage, and still appears to be sensitive to w/c ratio at a fixed curing age. Drying below 20% RH appears to blur these microstructural distinctions.
Journal of Materials Science
building technology, cement paste, drying, microstructure, shrinkage
, Jennings, H.
and Garboczi, E.
Mapping Microstructural Drying Shrinkage Deformations in Cement-Based Materials. Part 3: Influence of Specific Drying Shrinkage Mechanisms, Journal of Materials Science
(Accessed August 18, 2022)