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DEFAULT : Shrinkage mechanisms and shrinkage crack formation
12.02.2013 22:11 (4621 x gelesen)

Shrinkage mechanisms and shrinkage crack formation



Service life of reinforced concrete structures is often limited by shrinkage crack formation. Shrinkage strain as imposed under usual climatic conditions overcomes the maximum tensile strain capacity of most cement-based materials. It has been frequently suggested that capillary under-pressure of the liquid in the porous structure is at the origin of shrinkage. This hypothesis has even been implemented in some models to take shrinkage into consideration in numerical structural analysis.

More recently it has been shown that shrinkage is due to a complex interaction between the hydration products of Portland cement, i.e. the gel particles, and the pore liquid in the nano-pores. Colloidal mechanisms of shrinkage are further investigated in order to provide a solid basis for realistic and reliable prediction of shrinkage strain.

 

Relevant publications:

  1. F. Beltzung and F. H. Wittmann, Colloidal mechanisms of hygral volume change of hardened cement paste, Proc. Creep, Shrinkage and Durability of Concrete and Concrete Structures, Concreep-7, G. Pijaudier-Cabot, B. Gérard, and P. Acker, editors, Hermes Science Publishing, pp. 139-150 (2005)
  2. F. Beltzung and F. H. Wittmann, Role of disjoining pressure in cement-based materials, Cement and Concrete Research, 35, 2371-2383 (2005)
  3. F. H. Wittmann, F. Beltzung, and S. J. Meier, Shrinkage and Swelling of concrete without capillary condensed water, Int. Journal for Restoration of Buildings and Monuments 12, 35-42 (2006)


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