Abstract
The article presents the results of studies of innovative materials in the field of testing frost resistance. In fact, present accelerated methods for the determination of concrete frost resistance have high labour consuming and low effectiveness. Moreover there is no such accelerated methods which can be sufficiently applicable fro different innovative concretes, for example, concretes with SAP or self-compacting concrete and so on. Therefore, it is highly important to investigate new accelerated test method with high operability, efficiency and sufficient precision. Previously, two new methods were developed. The main purpose of the research is to compare these methods by evaluation of their technology and accuracy and, consequently, to identify the more sustain and efficient one. First method is based on estimation of energy release due to mechanical fracture and thermo cycling. Second method consists of the calculation value z (relation between relative decreasing of strength and relative strain in the direction perpendicular to compression) and replacement of thermo cycles by mechanical cycles. Both methods have high operability and do not take a lot of time, in was tested on the 10 specimens made of concrete and results were compared with values derived by standard method.
Highlights
Nowadays different kinds of new additives are more often used by the time of producing of concretes from cement
It is proved that the direct and indirect methods for determination of the strength of concrete give similar results [10] and using of indirect methods largely simplifies the indication of its basic parameters
It is necessary to create a new method of accelerated laboratory tests to evaluate frost resistance of various natural and artificial stones and other porous materials, especially innovative types of concretes
Summary
Nowadays different kinds of new additives are more often used by the time of producing of concretes from cement. It means properties or concrete and concrete mixture are influenced of such basic parameters as cement type [1], type of aggregates, water-cement ratio and of amount of additives and their types [2,3]. In order to facilitate the introduction of new technologies in the production of concrete it is necessary to simplify the process of laboratory testing of its properties [9]. It is necessary to create a new method of accelerated laboratory tests to evaluate frost resistance of various natural and artificial stones and other porous materials, especially innovative types of concretes
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