Article 7315

Title of the article

STUDYING THE PROCESS OF CEMENT STONE DAMAGE BY SOLUTIONS OF SULPHURIC ACID OF DIFFERENT CONCENTRATIONS

Authors

Selyaev Vladimir Pavlovich, RAACN academician, doctor of engineering sciences, professor, head of sub-department of building structures, Ogarev Mordovia State University (68 Bolshevistskaya street, Saransk, Russia), ntorm80@mail.ru
Sedova Anna Alekseevna, Candidate of chemical sciences, associate professor, sub-department of analytical
chemistry, Ogarev Mordovia State University (68 Bolshevistskaya street, Saransk, Russia), iman081@gmail.com
Kupriyashkina Lyudmila Ivanovna, Candidate of engineering sciences, professor, sub-department of building structures, Ogarev Mordovia State University (68 Bolshevistskaya street, Saransk, Russia), kupriashkina.liudmila@yandex.ru
Osipov Anatoly Konstantinovich, Candidate of chemical sciences, associate professor, head of sub-department of analytical chemistry, Ogarev Mordovia State University (68 Bolshevistskaya street, Saransk, Russia), osipov.ak@mail.ru

Index UDK

691.54: 678.046.3

Abstract

Background. Concrete is the most widely used construction material, however, effective exploitation thereof will always encounter external aggressive factors. In this connection there also remains a problem of corrosion of concrete structures. The purpose of this work is to study the effect of sulfuric acid of different concentration and time of the “cement stone – model solution” contact on strength of concrete.
Materials and methods. The object of the study was cement composites filled with DSPS 10, 20 and 30 % of the cement weight. By means of the static phase contact the authors studied interaction of sulphuric acid solutions with a filled cement composite. The researchers analyzed damage to materials in contact with aggressive media.
Result. The authors obtained kinetic dependences of pH during exposure to a corrosive environment, experimental data of the analysis of the filtrate after separation from the cement stone; determined the composition of the precipitate, separated from the cement, and its structure.
Conclusions. During the exposure of the cement, filled with DSPS, in solutions of sulphuric acid, there occur accumulation and crystallization of poorly soluble products in the pores of the concrete and on its surface. This creates internal stress due to expansion of pores in the concrete, which leads to its destruction.

Key words

cement stone, zeolite rock, hardness, sediment, filtrate, kinetic curves.

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References

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Дата создания: 19.01.2016 15:33
Дата обновления: 26.01.2016 14:02