Title: Drying Creep and Shrinkage test Results

Author(s):

Publication: CIA

Volume:

Issue:

Appears on pages(s):

Keywords:

DOI:

Date: 2/13/2011

Abstract:
Concrete creep and shrinkage can significantly affect the design and behaviour of concrete structures, particularly in relation to structural deformations and prestress losses. Accurate creep and shrinkage models would be valuable, but available models exhibit significant errors. Most models of concrete creep include a basic creep component (independent of concrete drying) and a drying creep component. However, the interaction of both properties is not well modelled. It was clearly documented in the literature that strains due to simultaneous effect of creep and shrinkage is higher than the summation of strains due to each of them separately. The explanation of this phenomenon, called the Pickett Effect, as well as the contributing mechanism/s is subject to controversy. There is uncertainty concerning the contributions of a ‘real’ drying creep mechanism (related to an interaction of creep and drying) and an ‘apparent’ mechanism (related to shrinkage induced stresses and associated cracking). The paper describes the experimental work that has been carried out in order to investigate these mechanisms.