1070-4272/02/7501-0018$27.00C2002 MAIK [Nauka/Interperiodica]
Russian Journal of Applied Chemistry, Vol. 75, No. 1, 2002, pp. 18!21. Translated from Zhurnal Prikladnoi Khimii, Vol. 75, No. 1,
2002, pp. 19!22.
Original Russian Text Copyright + 2002 by Akhrimenko.
AND INDUSTRIAL INORGANIC CHEMISTRY
Effect of Additions of Silica Gel and Certain Salts of Inorganic
Acids on Corrosion Resistance of Cement Stone
V. E. Akhrimenko
Kuban State Agricultural University, Krasnodar, Russia
Received April 28, 2001
Abstract-Effect of additions of silica gel and certain salts on the rheological parameters of cement mortar
and corrosion resistance of cement stone was considered.
Building of ports, docks, and breakwaters and also
of oil and gas wells requires cement mortars forming
corrosion-resistant cement stone on hardening.
The aim of this work was to study the effect of
additions of silica gel and salts of inorganic acids on
the corrosion resistance of cement stones. We used
oil-well portland cement for cold wells produced by
Oktyabr’ Plant (Novorossiisk) and silica gel
produced by Azot Production Association (Nevinno-
As the chemical treatment of grouting mortars is
the main means of the control over their process
parameters (flowing, setting time, and sedimentation
stability), we determined the properties of cement
mortars along with the corrosion resistance of cement
We studied cement stone corrosion by keeping
stone samples in the chosen aggressive solutions
under conditions the most closely simulating the
actual operation conditions of a cement stone in
As aggressive media we used 50 g l
sodium and magnesium chlorides and sulfates, which
corresponds to highly mineralized stratal waters. In
tempering liquids for cementing agents under study
the salt content was the same.
Cement mortars were prepared by thorough mixing
of cement with silica gel and by tempering this
mixture with drinking water or salt solutions. The
resulting cement mortars were tested according to
the procedure in  and GOST (State Standard)
We molded cement beams from cement mortars.
For this purpose we filled with cement mortar metallic
molds (200200100 mm), placed them in a desiccator
with drinking water, and left to harden at 20+2oC.
After hardening for two days, cement beams were
taken from the molds, marked, and placed in a bath
with drinking water or salt solutions for 7, 14, 28, and
90 days. On completion of hardening terms, the
cement samples were taken from the baths, and their
compression strength was determined. The results
(average of three experiments) are given in Table 1.
These experiments have shown (Table 1) that a
cement with silica gel added is more sedimentation-
stable; the water separation of such a solution is four
times less than that of a mortar solution without silica
As fluid-conducting channels, which are respons-
ible for interstratal crossflows, arise in the cement
stone structure in the course of hardening of a sedi-
mentation-unstable cement mortar, it was necessary
first of all to obtain a sedimentation-stable cement
It follows from Table 1 that the addition of silica
gel to a cement mortar considerably accelerates struc-
ture formation, which reduces the setting time of the
cement mortar. The cement mortar with sodium sul-
fate as a tempering liquid starts to set in 8 h 50 min,
whereas the same cement mortar containing silica gel
starts to set in 3 h 20 min.
The capacity of silica gel to accelerate the hydra-
tion is probably due to taking up a considerable part
of a free tempering liquid, so that the fluid phase
becomes oversaturated with respect to calcium hydro-
silicates, which accelerates their separation from the
solution. The precipitated calcium hydrosilicates act