Estimation of corrosion resistance of curing mixtures based on coal-bearing rocks from western Donbass
Purpose. Substantiation of possible use of coal-bearing rocks as a replacement for a part of the filler in the preparation of shotcrete for lining of mine workings in the conditions of mineralized mine water. Methods. The research is based on carrying out corrosion testing of concrete specimens by d...
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УкрНДМІ НАН України, Інститут геотехнічної механіки НАН України
2016
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irk-123456789-1335362018-06-02T03:03:37Z Estimation of corrosion resistance of curing mixtures based on coal-bearing rocks from western Donbass Kovalenko, V. Harkusha, V. Purpose. Substantiation of possible use of coal-bearing rocks as a replacement for a part of the filler in the preparation of shotcrete for lining of mine workings in the conditions of mineralized mine water. Methods. The research is based on carrying out corrosion testing of concrete specimens by dipping them into mine water. Chemical analysis of mine waters composition has been completed. A scanning microscope was used to study the state of concrete specimens microstructure. Findings. A comparative analysis was conducted to evaluate of the cement rock resistance to mineralized water, depending on the composition of the starting components for the grouting and shotcrete mixtures is carried out. The change in the chemical composition of mine water after soaking concrete specimens in it is defined. Photographs of concrete specimens microstructure after soaking in ordinary and mineralized water for 6 and 8 months are shown. Originality. Curing mixtures based on coal-bearing rocks from Western Donbass are mineralized water resistant and can act as a quality protection from aggressive water filtrationdue to the properties of rocks used as a filler. Practical implications. The results can be used for the rational choice of the composition of the concrete mixture with the replacement of filler part with mine rock. That will enhance the long-term stability of the mine working lined by these compositions. Цель. Обоснование возможности использование углевмещающих пород в качестве замены части заполнителя в процессе приготовления бетона для крепления горных выработок в условиях минерализованных шахтных вод. Методика. Работа базируется на проведении коррозионных испытаний бетонных образцов путем погружения их в шахтную воду. Выполнен химический анализ состава шахтных вод. Использован растровый микроскоп для исследования состояния микроструктуры бетонных образцов. Результаты. Выполнен сравнительный анализ оценки устойчивости цементного камня к воздействию минерализованной воды в зависимости от состава исходных компонентов для тампонажных, торкрет-бетонных и набрызгбетонных смесей. Определено изменение химического состава шахтной воды после выдержки в ней бетонных образцов. Представлены фотографии микроструктуры бетонных образцов после выдержки в нормальных условиях и минерализованной воде в течение 6 и 8 месяцев. Научная новизна. Твердеющие смеси на основе углевмещающих пород Западного Донбасса устойчивы к влиянию минерализованных вод и являются качественной противофильтрационной завесой благодаря свойствам пород, использованных в качестве заполнителя. Практическая значимость. Полученные результаты могут быть использованы для рационального подбора состава бетонной смеси с заменой части заполнителя шахтной породой, что позволит повысить длительную устойчивость горной выработки, закрепленной с использованием данных составов. Мета. Обґрунтування можливості використання вуглевміщуючих порід у якості заміни частини заповнювача в процесі приготування бетону для кріплення гірничих виробок в умовах мінералізованих шахтних вод. Методика. Робота базується на проведенні корозійних випробувань бетонних зразків шляхом занурення їх у шахтну воду. Виконано хімічний аналіз складу шахтних вод. Використаний растровий мікроскоп для дослідження стану мікроструктури бетонних зразків. Результати. Виконано порівняльний аналіз оцінки стійкості цементного каменю до впливу мінералізованої води залежно від складу вихідних компонентів для тампонажних, торкрет-бетонних і набризкбетонних сумішей. Визначено зміну хімічного складу шахтної води після витримки у ній бетонних зразків. Наведено фотографії мікроструктури бетонних зразків після витримки у нормальних умовах та мінералізованої води протягом 6 і 8 місяців. Наукова новизна. Твердіючі суміші на основі вуглевміщуючих порід Західного Донбасу достатньо стійкі до впливу мінералізованих вод та є якісною протифільтраційною завісою завдяки властивостям порід, використаних у якості заповнювача. Практична значимість. Отримані результати можуть бути використані для раціонального підбору складу бетонної суміші із заміною частини заповнювача шахтної породою, що дозволить підвищити тривалу стійкість гірничої виробки, закріпленої з використанням даних складів. 2016 Article Estimation of corrosion resistance of curing mixtures based on coal-bearing rocks from western Donbass / V. Kovalenko, V. Harkusha // Розробка родовищ: Зб. наук. пр. — 2016. — Т. 10, вип. 3. — С. 31-36. — Бібліогр.: 6 назв. — англ. 2415-3435 DOI: dx.doi.org/10.15407/mining10.03.031 http://dspace.nbuv.gov.ua/handle/123456789/133536 622.257-1 en Розробка родовищ УкрНДМІ НАН України, Інститут геотехнічної механіки НАН України |
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Purpose. Substantiation of possible use of coal-bearing rocks as a replacement for a part of the filler in the preparation of shotcrete for lining of mine workings in the conditions of mineralized mine water. Methods. The research is based on carrying out corrosion testing of concrete specimens by dipping them into mine water. Chemical analysis of mine waters composition has been completed. A scanning microscope was used to study the state of concrete specimens microstructure. Findings. A comparative analysis was conducted to evaluate of the cement rock resistance to mineralized water, depending on the composition of the starting components for the grouting and shotcrete mixtures is carried out. The change in the chemical composition of mine water after soaking concrete specimens in it is defined. Photographs of concrete specimens microstructure after soaking in ordinary and mineralized water for 6 and 8 months are shown. Originality. Curing mixtures based on coal-bearing rocks from Western Donbass are mineralized water resistant and can act as a quality protection from aggressive water filtrationdue to the properties of rocks used as a filler. Practical implications. The results can be used for the rational choice of the composition of the concrete mixture with the replacement of filler part with mine rock. That will enhance the long-term stability of the mine working lined by these compositions. |
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Kovalenko, V. Harkusha, V. |
| spellingShingle |
Kovalenko, V. Harkusha, V. Estimation of corrosion resistance of curing mixtures based on coal-bearing rocks from western Donbass Розробка родовищ |
| author_facet |
Kovalenko, V. Harkusha, V. |
| author_sort |
Kovalenko, V. |
| title |
Estimation of corrosion resistance of curing mixtures based on coal-bearing rocks from western Donbass |
| title_short |
Estimation of corrosion resistance of curing mixtures based on coal-bearing rocks from western Donbass |
| title_full |
Estimation of corrosion resistance of curing mixtures based on coal-bearing rocks from western Donbass |
| title_fullStr |
Estimation of corrosion resistance of curing mixtures based on coal-bearing rocks from western Donbass |
| title_full_unstemmed |
Estimation of corrosion resistance of curing mixtures based on coal-bearing rocks from western Donbass |
| title_sort |
estimation of corrosion resistance of curing mixtures based on coal-bearing rocks from western donbass |
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УкрНДМІ НАН України, Інститут геотехнічної механіки НАН України |
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| citation_txt |
Estimation of corrosion resistance of curing mixtures based on coal-bearing rocks from western Donbass / V. Kovalenko, V. Harkusha // Розробка родовищ: Зб. наук. пр. — 2016. — Т. 10, вип. 3. — С. 31-36. — Бібліогр.: 6 назв. — англ. |
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2025-07-09T19:10:20Z |
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2025-07-09T19:10:20Z |
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Founded in
1900
National Mining
University
Mining of Mineral Deposits
ISSN 2415-3443 (Online) | ISSN 2415-3435 (Print)
Journal homepage http://mining.in.ua
Volume 10 (2016), Issue 3, pp. 31-36
31
UDC 622.257-1 http://dx.doi.org/10.15407/mining10.03.031
ESTIMATION OF CORROSION RESISTANCE OF CURING MIXTURES
BASED ON COAL-BEARING ROCKS FROM WESTERN DONBASS
V. Kovalenko1, V. Harkusha1*
1Department of Construction, Geotechnics and Geomechanics, National Mining University, Dnipropetrovsk, Ukraine
*Corresponding author: e-mail vitaliagarkusha@yandex.ua, tel. +380997726878
ОЦІНКА КОРОЗІЙНОЇ СТІЙКОСТІ ТВЕРДІЮЧИХ СУМІШЕЙ
НА ОСНОВІ ВУГЛЕВМІЩУЮЧИХ ПОРІД ЗАХІДНОГО ДОНБАСУ
В. Коваленко1, В. Гаркуша1*
1Кафедра будівництва, геотехніки і геомеханіки, Національний гірничий університет, Дніпропетровськ, Україна
*Відповідальний автор: e-mail vitaliagarkusha@yandex.ua, тел. +380997726878
ABSTRACT
Purpose. Substantiation of possible use of coal-bearing rocks as a replacement for a part of the filler in the prepara-
tion of shotcrete for lining of mine workings in the conditions of mineralized mine water.
Methods. The research is based on carrying out corrosion testing of concrete specimens by dipping them into mine
water. Chemical analysis of mine waters composition has been completed. A scanning microscope was used to study
the state of concrete specimens microstructure.
Findings. A comparative analysis was conducted to evaluate of the cement rock resistance to mineralized water,
depending on the composition of the starting components for the grouting and shotcrete mixtures is carried out. The
change in the chemical composition of mine water after soaking concrete specimens in it is defined. Photographs of
concrete specimens microstructure after soaking in ordinary and mineralized water for 6 and 8 months are shown.
Originality. Curing mixtures based on coal-bearing rocks from Western Donbass are mineralized water resistant and
can act as a quality protection from aggressive water filtrationdue to the properties of rocks used as a filler.
Practical implications. The results can be used for the rational choice of the composition of the concrete mixture
with the replacement of filler part with mine rock. That will enhance the long-term stability of the mine working
lined by these compositions.
Keywords: concrete corrosion, durability, corrosion testing, mine rocks, mineralized water
1. INTRODUCTION
Using coal-bearing rocks as a replacement for a part
of shotcrete filler applied to support permanent workings
may affect on corrosion resistance of concrete. The de-
gree of concrete corrosion in permanent underground
workings depends on the aggressiveness of the environ-
ment, permeability of concrete and cement rock reactivi-
ty (Lagerblad, Fjällbergand, & Vogt, 2010).
Knowing the degree of the environment aggressive-
ness and its influence on the formation of a particular
type of concrete corrosion, it is necessary to choose a
binding agent for curing mixture, the use of which in
the underground bearing structures would increase the
durability of concrete. The works of such prominent
scientists: B.G. Skramtaev, A.E. Sheykin, S.A. Mironov,
P.I. Bozhenov, A.E. Desov, N.A. Moshchanskiy, V.I. So-
roker, S.V. Shestoperov etc., focus on improvement of
concrete properties when it is used in complex hydraulic
conditions. The works of N.G. Trupak, I.I. Vahramejev,
S.D. Voronkevich, E.Ya. Kipco etc. are devoted to issues of
developing theory and practice of rock grouting in mining.
The main factors that determine the resistance of con-
crete to aggressive fluids are: stability of the structure-
forming products of hydratation; density of cement rock
and concrete; ability to partially or completely recover
from damages due to further hydration of unreacted
binder particles. One of the main theoretical assumptions
of strength, corrosion resistance and durability of compo-
site is to create the optimum microstructure of concrete
stone, reducing porosity and improving crack resistance
due to the directed use of mineral fillers. The most vul-
nerable point of composite materials is the contact zone
“binder – filler”. It is from this contact zone that the
aggressive fluids begin to penetrate deep into the materi-
al and destroy it.
V. Kovalenko, V. Harkusha. (2016). Mining of Mineral Deposits, 10(3), 31-36
32
Thanks to introduction of mineral admixtures, the
filler smoothly penetrates into the cement matrix, and in
this case the contact zone as such is absent. Formation of
chemically resistant calcium silicate and zeolite in the
contact zone leads to compaction of the concrete struc-
ture and reduction of its permeability. Physical and
chemical processes of binding systems curing account for
the formation of a strong conglomerate with complex
chemical composition and capillary-porous structure of
the cement rock that largely determines the intensity of
corrosion processes between the external environment
and the concrete (Dunne, Christodoulou, Newlands,
McKenna, & Goodier, 2015).
Since cement rock curing involves the natural process
of its structure compaction, the filtration rate decreases.
When the cement rock is exposed to seepage the second
process takes place – dissolution of minerals hydration
products and their removal from the rock. So, we observe
two processes opposite in their character, thus the result
will depend on which of these processes is dominant.
To reduce or eliminate concrete corrosion, it is neces-
sary besides selecting an appropriate cement and filler to:
– bind partially or completely free calcium hydroxide
Ca(OH)2 in the concrete into insoluble or poorly water
soluble compounds;
– increase density and water resistance of concrete
and mortars;
– introduce the admixtures reducing pore volume and,
consequently, decreasing the expansion deformation,
which increases concrete hydrophobization.
Contact of cement particles with water causes selective
hydration of clinker minerals on the grain surface. First,
tree-calcium aluminate С3А and calcium alumoferrite
С4АF are hydrated, then three-calcium silicate С3S and
only 1 hour later – two-calcium silicate С2S. After for-
mation of the first layer of minerals, hydration of clinker
minerals proceeds depending on their exposure – or rather,
penetration of water into them. Cements which contain
increased amounts of small and large crystals reach their
absolute strength compared with cements containing crys-
tals of homogeneous size. The process of cement hydra-
tion is superficial, so its mechanism does not depend on
the large grains of cement, i.e. it is the same for cements
with coarse and fine grinding (Van Heerden, 2004).
In 1952, V.M. Moskvin proposed the classification of
the main types of concrete corrosion. During operation in
adverse hydrogeochemical conditions, the following
types of concrete corrosion may take place:
І type – leaching of calcium hydroxide Ca(OH)2. The
components of cement rock are dissolved and removed
from the concrete structure. This process can be particu-
larly intense during water filtration through the thickness
of the concrete lining;
ІІ type – exchange reactions between the minerals of
cement rock and magnesium salts of underground waters
with the creation of products without binding properties;
ІІІ type – crystallization of salts in the concrete
cracks, pores and capillaries, which causes a rise in inter-
nal stress and may eventually lead to the destruction of
structural elements of concrete stone.
Rarely does only one type of corrosion occur, but one
of them, as a rule, is dominant.
2. MAIN PART
For the research we used: cement of grade 500, natu-
ral quartz sand and rock from Heroiv Kosmosu mine at
PJSC “DTEK Pavlohradvuhillia”. The rocks, provided
by mine for experiments, are a mixture of argillites and
of aleurolites. In this paper, several recipes of grouting
and shotcrete compositions were considered. Concrete
samples were prepared to determine their properties.
Mine waters of Western Donbass are highly miner-
alized, corrosively active in relation to concretes and
metal roof supports. They contain significant amounts
of ion Cl– and SO– –. Their total hardness ranges
10 – 25 mgEq/L, pH = 7 – 7.8 (Kovalenko, 2012). Char-
acteristics of underground waters of Western Donbass
mines are presented in Table 1.
As mineralized mine water can affect the strength
and durability of cement rock, the experimental studies
were conducted to assess the impact of underground
water on the quality of the coatings obtained by curing
mixtures (Harkusha, 2015).
Comparative analysis of the compression strength
was conducted for the samples that were curing in
normal conditions and those that were curing in miner-
alized water for one year. Results of estimating cement
rock resistance to mineralized water are shown in
Table 2.
From Table 2 it is obvious that during the period of
1 year mineralized mine water does not produce any
adverse effect on the samples of solidifying mixtures –
the curing process continues. In this case, mineralized
water is not an aggressive medium, because the samples
continue to gain strength.
Table 1. Characteristics of underground waters of Western Donbass mines
Name of the mine pH
General
minera-
lization, g/l
Chemical composition,
mg/dm3
%Eq
Corrosion rate at
Kk =
rMg++ – rHCO3 > 0,
corrosive medium
Aggression
to metal
SO4
– – + Cl–
Cl– SO4
– – Mg++ HCO3
–
Blahodatna 7.0 23.3
14584
99
6_
0.1
644
12
85
0.3
51.6
strongly
aggressive
Zakhidno-Donbaska 6.5 – 7.0 36.5
23049
98.6
320
1
2152
27
140
0.3
174.3
strongly
aggressive
Heroiv Kosmosu 6.9 27.2
17375
99
201
0.1
1520
25
1280
0.4
122.9
strongly
aggressive
Stashkova 7.4 3.9
1687
71
687
14
328
22
329
5.4
16.6
strongly
aggressive
V. Kovalenko, V. Harkusha. (2016). Mining of Mineral Deposits, 10(3), 31-36
33
Table 2. Results of estimating cement rock resistance to mineralized water
Composition Compressive strength
at the age of 28 days,
MPa
after 12 months’soaking
in mine water, MPa
Grouting mixture
Cement : Sand : Rock = 1 : 1 : 2 11.37 12.9
Cement : Sand : Rock = 1 : 2 : 1 18.78 23.9
Cement : Sand : Rock = 1 : 3 : 0 16.74 22.8
Shotcrete and shotcreting mixtures
Cement : Sand : Rock = 1 : 1 : 2 19.87 20.0
Cement : Sand : Rock = 1 : 1 : 2 + 3% silica gel +
+ 3% hydrophobizator
17.80 25.1
Cement : Sand : Rock = 1 : 1 : 2 + 3% silica gel 15.20 22.3
Cement : Sand : Rock = 1 : 1 : 2 + 20% polyvinyl
acetate emulsion
15.90 24.0
Analysis of the results indicates that after curing in
mineralized water the strength of the concrete samples
increased by 10 – 30% in comparison with strength of
the samples curing in normal conditions. Aggressive
influence can become evident in later periods of concrete
samples’ staying in contact with mineralized water
(Kurilko, Drozdov, Alekseev, & Nikiforova, 2014).
Table 3 shows changes in the chemical composition
of mine water after one-year immersion of the curing
mixtures samples based on mine rocks. In the investigat-
ed solution, the content of almost all chemical elements
has increased. It is especially necessary to note the in-
crease in calcium content in the mine water from 1.9 to
4.8 g/dm3 which testifies to corrosion of I and II type
between water environment and the immersed concrete
sample. For the case of type III corrosion, as salts accu-
mulate in the pores of the concrete at the initial stages, it
gets compacted.
Table 3. Changes in the chemical composition of mine water
Defined characteristics
Measure
unit
Water composition Increase /
decrease, % initial after samples’ soaking
Hydrogen index (pH) unit 6.60 6.60 0.00
Total hardness mgEq/dm3 161.43 416.51 258.00
Chlorides mg/dm3 19285.00 53344.00 276.60
Sulfates mg/dm3 74.00 606.00 818.90
Nitrates mg/dm3 10.00 — —
Potassium + sodium mg/dm3 8867.00 25365.00 286.00
Calcium mg/dm3 1905.00 4841.00 254.10
Magnesium mg/dm3 807.00 2115.00 262.10
If this process is developing slowly, filling of the
pores and hollows in the concrete by crystalline for-
mations and resulting concrete compaction create an
illusion that everything goes the right way. For a certain
period of time, the concrete strength increases and ex-
ceeds the strength of the concrete that was not subjected
to the action of aggressive environment. Hence some-
times it is not possible to recognize initial forms of type
III corrosion developing. Only after the appearance of
significant tensile forces in the pores’ and capillaries’
walls, caused by the continuing growth of crystals, the
structural elements of the cement rock are destroyed and
therefore its strength decreases noticeably.
Therefore, when evaluating conditions for potential
type III corrosion, one should use the results of short-
term tests cautiously if the cement durability criterion is
compressive strength. On the samples curing in mine
water, whitish scurf and salt crystals were formed. This
suggests that there is a type III corrosion process, name-
ly, the crystallization of salts in the cracks, pores and
capillaries of the cement rock. The salt accumulation
increases the internal stress and may eventually result in
destruction of the structural elements of the cement rock.
Corrosion effect is greatly enhanced at alternate im-
mersion of concrete into the salt solution and drying out.
This also happens during partial immersion since the
chemical processes of interaction between aggressive
environment and cement rock are accompanied by the
physical processes of corrosion products or soluble com-
ponents crystallization. Besides, the processes of mass
transfer are enhanced, for example, as a result of capil-
lary forces.
Figures 1, 2, 3 and 4 present micrographs of the sam-
ples that were in contact with mineralized water, and the
samples that did not have contact with mineralized water.
Most easily soluble product of cement hydration is
calcium hydroxide whose leaching results in hydrolysis
of the cement clinker. What happens first is the destruc-
tion of polybasic compounds such as tricalcium and
dicalcium hydrosilicates, followed by low-basic com-
pounds. Tetracalcium alumina ferrite 4·СаО·Аl2O3·FeO
are the least resistant of hydroaluminates.
I type concrete corrosion resistance depends on the
chemical composition of the cement used. Prevalence of
highly basic compounds in the cement (alite С3S, belite
С2S) reduces cement resistance if their destruction is due
to the dissolution of its component parts, i.e. the solution
acquires a large amount of СаО.
Sulfates of sodium and potassium present in water,
which are in contact with the cement matrix, can improve
V. Kovalenko, V. Harkusha. (2016). Mining of Mineral Deposits, 10(3), 31-36
34
the solubility of the cement rock components and thereby
accelerate the development of I type corrosion, on the
other hand, they can cause the development of metabolic
reactions of Ca2+ cation substitution from the cement
matrix, i.e. cause type II corrosion.
The corrosion rate develops rapidly in the initial peri-
od and gradually fades with time. The change in corro-
sion rate is related to formation on the reaction surface of
corrosion products which inhibit the access of aggressive
substances to it.
Initially, the corrosion rate is determined by the rate
of aggressive environment interaction with the concrete
components or dissolution rate. However, quite soon
reaction products appear on the surface, and corrosion
rate becomes affected by the diffusion of aggressive
fluids onto the reaction surface.
(a) (b)
Figure 1. Micrographs of cement rock based on mine rocks that was curing in normal conditions
(a) (b) (c)
Figure 2. Micrographs of cement rock based on mine rocks that was in contact with mineralized mine water for 6 months
(a) (b) (c)
Figure 3. Micrographs of cement rock based on mine rocks that stayed in contact with mineralized mine water for 8 months
(the sample selected directly on the cube surface)
V. Kovalenko, V. Harkusha. (2016). Mining of Mineral Deposits, 10(3), 31-36
35
(a) (b) (c)
Figure 4. Micrographs of cement rock based on mine rocks that stayed for 8 months in contact with mineralized mine water
(the sample selected at a depth of 4 cm from the cube surface)
During this time, the so-called diffusion-kinetic peri-
od, the corrosion rate is defined both by the rate of chem-
ical interaction and the diffusion of the reactants.
In the underground structures corrosion products tend to
remain in the place of their formation. Thus there is a gradu-
al increase in the thickness of the corrosion product layer
and increase in its density. In these conditions, the corrosion
rate and the depth of concrete deterioration is determined by
diffusion of reactants and the degree of aggressiveness.
Currently there are no developed techniques yet,
which would allow to determine reliably the depth of
concrete destruction under corrosion, on the basis of data
about its composition and conditions of aggressive ac-
tion. Existing methods for predicting the depth of con-
crete corrosion are based on preliminary tests that help to
define the concrete corrosion depth during the set time
period under the long-term impact taking into account
the laws of corrosion development.
3. CONCLUSIONS
Concrete corrosion processes in conditions of West-
ern Donbas mines are not so intense that the concrete
coating becomes defective before the lifetime expiration
term of most permanent workings, where we plan to use
the developed mixture compositions. Thus, the proposed
compositions of curing mixtures based on coal-bearing
rocks from mines of Western Donbass are resistant to the
effects of mineralized mine water. Moreover, they can be
an effective protective coating for metal components of
mining roof support, and act as a grout curtain.
The introduction of corrective admixtures in the ob-
tained curing mixtures is possible only if it is technologi-
cally and economically reasonable. The conducted stud-
ies indicate that such set of activities often does not pro-
duce a significant effect.
The obtained compositions of curing mixtures are re-
sistant to the impact of mineralized mine water. Moreo-
ver, they can be a high quality sealing curtain, because
the filler used (a mixture of argillites and of aleurolites)
can absorb and retain water.
ACKNOWLEDGEMENT
The authors express their gratitude to the administra-
tion of the Department of Construction, Geotechnics and
Geomechanics of the National Mining University
(Dnipropetrovsk, Ukraine), represented by O. Shashenko
and A. Solodiankin, as well as to all those who helped in
carrying out works related to preparation of this paper.
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36
ABSTRACT (IN UKRAINIAN)
Мета. Обґрунтування можливості використання вуглевміщуючих порід у якості заміни частини заповнюва-
ча в процесі приготування бетону для кріплення гірничих виробок в умовах мінералізованих шахтних вод.
Методика. Робота базується на проведенні корозійних випробувань бетонних зразків шляхом занурення їх у
шахтну воду. Виконано хімічний аналіз складу шахтних вод. Використаний растровий мікроскоп для дослі-
дження стану мікроструктури бетонних зразків.
Результати. Виконано порівняльний аналіз оцінки стійкості цементного каменю до впливу мінералізованої
води залежно від складу вихідних компонентів для тампонажних, торкрет-бетонних і набризкбетонних сумі-
шей. Визначено зміну хімічного складу шахтної води після витримки у ній бетонних зразків. Наведено фотог-
рафії мікроструктури бетонних зразків після витримки у нормальних умовах та мінералізованої води протягом
6 і 8 місяців.
Наукова новизна. Твердіючі суміші на основі вуглевміщуючих порід Західного Донбасу достатньо стійкі
до впливу мінералізованих вод та є якісною протифільтраційною завісою завдяки властивостям порід, викорис-
таних у якості заповнювача.
Практична значимість. Отримані результати можуть бути використані для раціонального підбору складу
бетонної суміші із заміною частини заповнювача шахтної породою, що дозволить підвищити тривалу стійкість
гірничої виробки, закріпленої з використанням даних складів.
Ключові слова: корозія бетону, міцність, корозійні випробування, шахтні породи, мінералізовані води
ABSTRACT (IN RUSSIAN)
Цель. Обоснование возможности использование углевмещающих пород в качестве замены части запол-
нителя в процессе приготовления бетона для крепления горных выработок в условиях минерализованных
шахтных вод.
Методика. Работа базируется на проведении коррозионных испытаний бетонных образцов путем погруже-
ния их в шахтную воду. Выполнен химический анализ состава шахтных вод. Использован растровый микро-
скоп для исследования состояния микроструктуры бетонных образцов.
Результаты. Выполнен сравнительный анализ оценки устойчивости цементного камня к воздействию мине-
рализованной воды в зависимости от состава исходных компонентов для тампонажных, торкрет-бетонных и
набрызгбетонных смесей. Определено изменение химического состава шахтной воды после выдержки в ней
бетонных образцов. Представлены фотографии микроструктуры бетонных образцов после выдержки в нор-
мальных условиях и минерализованной воде в течение 6 и 8 месяцев.
Научная новизна. Твердеющие смеси на основе углевмещающих пород Западного Донбасса устойчивы к
влиянию минерализованных вод и являются качественной противофильтрационной завесой благодаря свой-
ствам пород, использованных в качестве заполнителя.
Практическая значимость. Полученные результаты могут быть использованы для рационального подбора
состава бетонной смеси с заменой части заполнителя шахтной породой, что позволит повысить длительную
устойчивость горной выработки, закрепленной с использованием данных составов.
Ключевые слова: коррозия бетона, прочность, коррозионные испытания, шахтные породы, минерализо-
ванные воды
ARTICLE INFO
Received: 24 June 2016
Accepted: 19 July 2016
Available online: 30 September 2016
ABOUT AUTHORS
Vladyslav Kovalenko, Candidate of Technical Sciences, Associate Professor of the Department of Construction,
Geotechnics and Geomechanics, National Mining University, 19 Yavornytskoho Ave., 4/40, 49005, Dnipropetrovsk,
Ukraine. E-mail: kovalenko_vlad@mail.ru
Vitaliia Harkusha, Postgraduate Student of the Department of Construction, Geotechnics and Geomechanics,
National Mining University, 19 Yavornytskoho Ave., 4/15, 49005, Dnipropetrovsk, Ukraine. E-mail:
vitaliagarkusha@yandex.ua
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