Study of change in the deformation-strength properties of nanomodified fine-grained concretes over time
DOI:
https://doi.org/10.15587/1729-4061.2017.101032Keywords:
fine-grained concrete, nano-modifier, modulus of elasticity, micellar catalysis, surface-active substancesAbstract
We examined a change over time of such properties of fine-grained concrete as strength at compression and deformation under the action of an external load. The studies were conducted for the possibility of determining the physicomechanical properties of concretes, required to calculate the ferroconcrete structures, first of all monolithic, at different age of their fabrication. We established a relation between the rates of formation of the deformation properties and the strength at compression of fine-grained concrete. It is found that the strength of fine-grained concrete and its deformations under the action of an external load depend on the composition of concrete and the presence in it of the surface-active substances that form micelles. The existence of micelles ensures the catalysis of synthesis reactions of hydro silicate during the hardening of cement. This leads to the acceleration of formation of compressive strength and the deformative properties of concrete. An increase in the content of the given surface-active substances to a specific magnitude, which depends on the type of the used cement and the composition of concrete, leads to an increase in the strength of concretes and the rate of its formation. The magnitudes of strength of the obtained concrete and the rate of its formation also depend on the type of the utilized cement and the composition of concrete. At the same time, the optimum content of these surface-active substances, which ensures maximum magnitude of the initial modulus of elasticity of concrete prior to the age of concrete of 28 days, has not been practically established. The value of initial modulus of elasticity of concrete at this age is proportional to its content of the surface-active substances that form micelles.
The studies conducted make it possible to determine the methods of control over the strength and deformativeness of fine-grained concretes for shortening the time of constructing the monolithic and the duration of hardening of the prefabricated ferroconcrete structures.References
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