Corrosion of Silicate Materials

At one of the construction projects after severe frosts there was the destruction of silicate bricks of the technical storey. To clarify the causes, the frost resistance was determined not only according to GOST 7025–91 but also at extremely low temperature (-40 and -52°C). Research in the structure and chemical composition of samples from the construction site was also conducted by the methods of differential-thermal (DTA), X-ray phase (XPA) and X-ray fluorescence element (XFA) analyses. To clarify the microstructure of samples the scanning electronic microscopy (SEM) was also made. When studying samples with the help of SEM, it is established that in the completely destructed sample there was a thin porous structure composed of short plates which were partially crystallized out of the amorphous matrix. At this, the structure of the stone not subjected to the impact of salts is analogous to the initial one. It is established that the cause of corrosion was the use of chemical reagents for removing the icing. It is concluded that such impact is unacceptable for any concretes.

M.V. KORNEV¹, Candidate of Sciences (Engineering) (This email address is being protected from spambots. You need JavaScript enabled to view it.);
A.V. MAKAROV², Candidate of Sciences (Engineering),
I.N. TIKHOMIROVA², Candidate of Sciences (Engineering),
M.A. KARPENKO², Bachelor ¹ NP «Association of Manufactures of Silicate Products» (111, Lenina Avenue, Dzerzhinsk, 606000, Nizhny Novgorod Oblast, Russian Federation) 
² D.I. Mendeleev University of Chemical Technology of Russia (9, Miusskaya Square, 125047, Moscow, Russian Federation)

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