Studies of changes in the structure of vermiculite as a filler of building materials by the method of electron microscopy

In this article, construction materials are considered, which are used as a lightweight aggregate for concretes and mortars as well as for thermal insulation designs. Particular attention is paid to materials based on expanded vermiculite. The methods of using vermiculite in construction are analyzed. The study is carried out by electron microscopy of vermiculite crystals burnt traditionally and treated with chemical solutions (fired at 400 ° C). Based on the above study, the developed method for baking vermiculite can be considered the most suitable for technological parameters and operational requirements for use in the construction industry

Non-destructive control method of the state of objects operating long time

The development of a diagnostic system is a complex engineering problem aimed at preventing damage caused by deteriorating properties of the materials and structures. This article presents the method of nondestructive testing of change control of concrete structures. The analysis of literature data shows that the overwhelming majority of studies are devoted to the change in electrical resistance of concrete in the collection of its strength, and practically no analogous studies regarding its aging are presented. Theoretical substantiation of the change in electrical concrete characteristics (conductivity, resistance) is given with a change in its strength. A work over-bridge in operation more than 30 years has been surveyed. The experimental part consisted in measuring the electrical potentials on the bridge structures, as well as in determining the strength of the material at the same points. Correlation dependence between the measured electric potential value and the strength of the samples taken from the bridge structures were obtained

Non-destructive control method of the state of objects operating long time

The development of a diagnostic system is a complex engineering problem aimed at preventing damage caused by deteriorating properties of the materials and structures. This article presents the method of nondestructive testing of change control of concrete structures. The analysis of literature data shows that the overwhelming majority of studies are devoted to the change in electrical resistance of concrete in the collection of its strength, and practically no analogous studies regarding its aging are presented. Theoretical substantiation of the change in electrical concrete characteristics (conductivity, resistance) is given with a change in its strength. A work over-bridge in operation more than 30 years has been surveyed. The experimental part consisted in measuring the electrical potentials on the bridge structures, as well as in determining the strength of the material at the same points. Correlation dependence between the measured electric potential value and the strength of the samples taken from the bridge structures were obtained