The Influence Of Drying Shrinkage On Long-Term Joint Movement In A Multi Level Car Park

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Title: The Influence Of Drying Shrinkage On Long-Term Joint Movement In A Multi Level Car Park

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Publication: CIA

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Date: 2/13/2011

Abstract:
Concrete drying shrinkage limits are commonly specified for the construction of large flat slabs in structures in order to potentially reduce the risk of cracking. Such specifications alone will not ensure good serviceability performance of slabs. Contractually, natural test variations in the measurement of drying shrinkage are generally not taken into account in construction documentation. To test the relationship between joint movement, cracking and drying shrinkage, a commercial R&D program was conducted between 1998 and 2001. The study focused on a set of concretes used in the construction of a multi-level car park structure in Sydney. Restraints were included in the analysis as parameters and linked to movement and stress conditions. Work included a project specific review of the fresh and hardened concrete data on the materials used, modelling longterm creep, shrinkage, elastic modulus and compressive strength versus time. Key findings were that restraint conditions were highly significant in determining the response of the structure to shrinkage of concrete and other element deformations. In addition, design and detailing of localised areas were found to be important in managing shrinkage related displacements.


Concrete Institute of Australia, International Partner Access.

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