Hydrophobization of dense and fine concrete by polysulfide solutions.

Massalimov, I. A.; Yanakhmetov, M.R.; Chuykin, A.E.; Massalimov, B.I.; Urakaev, F.H.; Uralbekov, Bolat

doi:10.15828/2075-8545-2016-8-5-85-99

Cited by 5 publications

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“…The positive results of the use of polysulfide solutions can serve as an incentive for the processing of waste from limestone quarries of limestone (in the form of sand and gravel), which in the natural state do not possess the set of physicochemical properties necessary for their use in road and industrial construction [11][12][13]. Thereby, an experiment was conducted on the impregnation of limestone sand and crushed stone in order to reduce the water absorption parameter, using the polysulfide solution treatment technique [14][15][16][17].…”

Section: Introductionmentioning

confidence: 99%

Conversion of limestone-limestone mining waste by impregnation with polysulfide solutions

Massalimov¹,

Massalimov²,

Akhmetshin³

et al. 2020

Nanobuild

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The data of studies on the effectiveness of impregnating Aquastat waste generated as a result of the development of limestone-shell rock deposits are presented. As a result of sand impregnation, the water absorption coefficient as a result underwent a significant decrease from 7 to 17 times, while the water absorption coefficient decreases from 32.5% for the initial to 1.9% impregnated. Even treatment with low concentrated (ρ = 1.17 g / cm 3) calcium polysulfide solution made the water absorption coefficient to decrease to a value of 4.5%. As a result of impregnation of crushed stone from limestone-limestone with a solution of calcium polysulfide, the water absorption coefficient decreases from 25.0% for untreated to 5.2% for treated, and the decrease in the coefficient of water absorption is greater for concentrated solutions. It was found that a solution density of 1.24 g/cm 3 is sufficient to reduce the water absorption coefficient to a value of 5.2%, the same as for a density value of 1.35 g/cm 3. Comparison of the results of impregnation with «Aquastat» solution and sulfur melt showed that as a result of treatment with sulfur melt, the water absorption coefficient decreases by 13.3 and strength increases by 2 times, and as a result of impregnation with «Aquastat» solution decreases by 4.62%, strength increases by 1.35 times. Despite the high efficiency of sulfur melt processing, such treatment has drawbacks associated with the use of autoclave technology and high temperatures. The results of the modification of sand and crushed stone from shell rock by impregnating it with the «Aquastat» solution, a significant decrease in the water absorption parameter, an increase in compressive strength, revealed the possibility of using impregnated crushed stone as the layer material lying at the base of the road structures of local roads in the form of crushed stone and sand instead of the more expensive imported crushed stone.

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Section: Introductionmentioning

confidence: 99%

Conversion of limestone-limestone mining waste by impregnation with polysulfide solutions

Massalimov¹,

Massalimov²,

Akhmetshin³

et al. 2020

Nanobuild

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Water-Resistant Clay and Slag Composite Materials of Autoclaved Hardening

Makridina

Старостина

Lushnikov

et al. 2023

Lecture Notes in Civil Engineering

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The role of colmatation in liquid corrosion of hydrophobized concrete

Fedosov

Rumyantseva

Konovalova

et al. 2020

IOP Conf. Ser.: Mater. Sci. Eng.

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To reduce water absorption of cement concretes resort to hydrophobization by introducing special additives in the manufacturing process of the product. In the study of liquid corrosion of hydrophobized cement concretes of the W4, W6 and W8 waterproofness grades in media of various degrees of aggressiveness, the terms for achieving a state close to the equilibrium concentration of calcium cations in the solution were established. Based on the experimental data on the liquid corrosion of cement concretes of various grades in terms of water resistance, the optimum amount of hydrophobizing calcium stearate additive was determined, which is sufficient to prevent corrosion damage in concrete, depending on the degree of aggressiveness of the medium. Tests of strength characteristics of hydrophobized cement concretes of the W4, W6 and W8 waterproof grades were carried out. It is established that when alkali and alkaline-earth stearates are introduced into concrete as hydrophobic additives, its strength is significantly increased compared to non-hydrophobized concrete samples. Some special cases of changes in the mass conductivity coefficient during colmatation of hydrophobized cement concretes of the W4, W6 and W8 waterproof grades are considered and graphically illustrated. Profiles of changes in the rate of colmatation and the thickness of the colmatant layer for cement concretes with and without hydrophobizing additives are presented. The profiles show that over time there is a weakening of the mass flow, which is obviously associated with an increase in the colmatant layer. The rate of colmatation is also reduced due to the fact that the layer of colmatant partially or completely clogged the pores and prevents further penetration of the aggressive medium deep into the concrete.

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Hydrophobization of dense and fine concrete by polysulfide solutions.

Cited by 5 publications

References 0 publications

Conversion of limestone-limestone mining waste by impregnation with polysulfide solutions

Conversion of limestone-limestone mining waste by impregnation with polysulfide solutions

Water-Resistant Clay and Slag Composite Materials of Autoclaved Hardening

The role of colmatation in liquid corrosion of hydrophobized concrete

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