Experimental theoretical modelling of concrete shrinkage in massive structures

Abstract

In spite of the high culture of modern construction, the majority of massive structures erected in different countries of the world cannot avoid shrinkage cracks during the curing process, which negatively affect both the stiffness and durability of such structures. Shrinkage processes in massive structures are not regulated by standards, although a large number of specialists deal with these issues. During design and construction of most massive structures (usually such structures are unique), separate special studies are carried out for each project, calculations of stress state are performed, and technological regulations are prepared, but the actual values of shrinkage deformations almost always differ from the calculated ones. The task of this study is to develop a methodology for measuring concrete shrinkage in massive structures, as well as to determine the qualitative criteria by which one or another shrinkage deformation can be estimated. The obtained results allow a more correct understanding of the stress-strain state that occurs in massive structures after pouring concrete mixture and more correctly prepare technological regulations, which will reduce the number of cracks in the poured structure.

Keywords

• concrete
• shrinkage
• creep
• relaxation
• long-term testing