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CONFERENCE PROCEEDINGS
8th INTERNATIONAL CONFERENCE
CONTEMPORARY ACHIEVEMENTS IN CIVIL ENGINEERING 2021 , 2021.y., pp. 385-394


PROBLEMS OF CREEP AND SHRINKAGE TESTING IN HARDENED CONCRETE
 
DOI: 10.14415/konferencijaGFS2021.37
UDC: 666.972:532.135
CC-BY-SA 4.0 license
Author : Kekanović, Milan; Krstić, Katarina; Petrov, Ramona
 
 Summary:
 This paper provides some new views of the familiar problems of measurement and testing of creep and shrinkage of concrete rheological time deformation. Concrete creep is not a theoretical, but a structural problem and solutions must be sought exclusively by experimental tests and measurements. On the basis of such measurements, monitoring and observing the structural changes, it is possible to make theoretical assumptions. What is well known is that the creep directly depends on the condition and magnitude of the stresses to which the concrete cross section is exposed. Those sections of concrete that are only partially used, in terms of stress, are not as sensitive to creep as sections that are loaded to the point of proportionality. A particular problem and the enormous increase in the creep of concrete would occur if sections were loaded above the points of proportionality and elasticity. The creep of concrete over time on real structures in use, in most cases, both in old and new structures, increases unpredictably in the first years. One can ask a question and doubt the magnitude of the actual stress states to which the concrete structures are exposed. Our measurements for determining an ultimate strength of concrete on cubes, prisms and cylinders indicate such doubt. During the conducted tests of creep and shrinkage of concrete, which were done in doctoral studies in 2020 at the Faculty of Civil Engineering in Subotica, which are still ongoing, we present only one segment related to the topic of stress to which sections in concrete structures are exposed.
 
 Keywords:
 Concrete, deformation, rheology, shrinkage, creep