On the influence of hardening conditions on the properties of self-compacting concrete
Abstract
On the influence of hardening conditions on the properties of self-compacting concrete
Incoming article date: 09.09.2022The results of studies of the influence of various hardening conditions, incl. simulating conditions in the center of massive monolithic structures, for compressive and tensile strength, initial modulus of elasticity, hardening kinetics of self-compacting concrete of classes from B25 to B55. A classification of concretes according to the hardening kinetics is proposed, using as a criterion the time to reach a certain level from the design compressive strength under normal hardening conditions. The invariance of the dependence of the initial modulus of elasticity of the investigated concretes on the compressive strength on the age and type of concrete is established. A certain difference between the dependence "initial modulus of elasticity - ultimate compressive strength" and a lag in the rate of increase in tensile strength from the rate of increase in compressive strength of the studied concretes in the early period of hardening relative to traditional concretes of vibration compaction were revealed. It is shown that in the early period of hardening the studied concretes are characterized by a higher level of the conditional crack resistance criterion E0/Rt, which indicates to a certain extent a higher fragility of the studied concretes in this period.
Keywords: self-compacting concrete, compressive and tensile strength, hardening kinetics, modulus of elasticity, crack resistance criterion