Abstract
This paper reports the results of experimental research of the effect of strain-restriction conditions on the structure and properties of sulfoaluminate expanding cementitious materials. Theoretical analysis of the development of pattern formation processes is performed by applying the developed rheological model, illustrating features of the kinetics of structure-forming processes according to the ratio of the potential index of extension with linear, flat and volumetric limitation of deformations of the extension. The results show that rheological model adequately correlates with the results of experimental studies and can be described mathematically. Found that with the volume limitation of deformations arising when mixing crystallographic phases with high density and strength, the pore structure of the cement stone contains mainly gel pores. This is the main prerequisite for obtaining a dense, high-strength and durable structure of cement stone and concrete on its basis.
Highlights
Provision of operating reliability of concrete and reinforced concrete building structures is to a significant extent defined with quality and durability of concrete used for their production
Guaranteed provision of designed physical and chemical properties of concrete is in turn defined with numerous factors and their mutual influence, which are at the present time sufficiently well-known
Factors defining the quality of concrete first of all include the influence and the properties of mineral binders, inert aggregates, and mutual influence of “external” and “internal” hardening conditions for binders and concretes on their basis
Summary
Provision of operating reliability of concrete and reinforced concrete building structures is to a significant extent defined with quality and durability of concrete used for their production. Guaranteed provision of designed physical and chemical properties of concrete is in turn defined with numerous factors and their mutual influence, which are at the present time sufficiently well-known. Factors defining the quality of concrete first of all include the influence and the properties of mineral binders, inert aggregates, and mutual influence of “external” and “internal” hardening conditions for binders and concretes on their basis. Among numerous “internal” factors defining the quality of concrete mixes and concrete are chemical and mineralogical and grain-size composition of mineral binder, correlation of components in concrete mix, quantity and quality of additives in the mix [1, 2]. According to the proposed model the influence of “internal” and “external” factors on structure and properties of hardening cement stone and concrete on its basis demonstrates itself via a piston system „V“, which is connected to a piston vessel “R”. According to the proposed model the influence of “internal” and “external” factors on structure and properties of hardening cement stone and concrete on its basis demonstrates itself via a piston system „V“, which is connected to a piston vessel “R”. (Figure 1)
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