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The drying shrinkage of concrete is analogous to the mechanism of drying of timber specimen. The loss of free water contained in hardened concrete, does not result in any appreciable dimension change. It is the loss of water held in gel pores that causes the change in the volume.
The shrinkage stress of a concrete slab with a shrinkage strip can be computed by a linear combination of analysis results with or without strips according to the construction schedule including closing time of the strip if the material non-linearity is excluded.