High-frequency magnetic-pulse treatment of water as a method of improving the technological properties of fine concretes

Ажаронок, В. В.; Белоус, Н. Х.; Rodtsevich, S. P.; Кошевар, В. Д.; Гончарик, С. В.; Chubrik, N. I.; Orlovich, A. I.

doi:10.1007/s10891-010-0311-9

Cited by 11 publications

(8 citation statements)

References 2 publications

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“…It is well known that both the water presence and water transport play key roles in determining the pore structure and mechanical strength as well as long-term durability of cementitious materials. Magnetic treatment of water has been carried out in many studies to improve the properties of cementitious materials [2][3][4][5][6]. On the other hand, a magnetic field can accelerate the crystallization of sparingly soluble diamagnetic salts of weak acids like calcium carbonate [7] and gypsum [8].…”

Section: Introductionmentioning

confidence: 99%

Effects of Static Magnetic Fields on the Physical, Mechanical, and Microstructural Properties of Cement Pastes

Soto‐Bernal

González‐Mota

Rosales-Candelas

et al. 2015

Advances in Materials Science and Engineering

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This paper presents the results of an experimental study carried out to comprehend the physical, mechanical, and microstructural behavior of cement pastes subjected to static magnetic fields while hydrating and setting. The experimental methodology consisted in exposing fresh cement pastes to static magnetic fields at three different magnetic induction strengths: 19.07, 22.22, and 25.37 Gauss. The microstructural characterization makes evident that there are differences in relation to amount and morphology of CSH gel; the amount of CSH is larger and its morphology becomes denser and less porous with higher magnetostatic induction strengths; it also shows the evidence of changes in the mineralogical composition of the hydrated cement pastes. The temperature increasing has no negative effects over the cement paste compressive strength since the magnetostatic field affects the process of hydration through a molecular restructuring process, which makes cement pastes improve microstructurally, with a reduced porosity and a higher mechanical strength.

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Section: Introductionmentioning

confidence: 99%

Effects of Static Magnetic Fields on the Physical, Mechanical, and Microstructural Properties of Cement Pastes

Soto‐Bernal

González‐Mota

Rosales-Candelas

et al. 2015

Advances in Materials Science and Engineering

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“…Удельная электропроводность обработанной воды, испытывая определенные флуктуации, тем не менее, имеет тенденцию к возрастанию (от 12 до 15,2 мСм/см) по мере увеличения времени активации. Следует отметить, что эффекты магнитной обработки более ярко проявляются в случае воздействия на водопроводную воду по сравнению с дистиллированной [1,16]. Данный факт свидетельствует в пользу гидратационного подхода к объяснению эффектов влияния магнитного поля на анализируемые водные растворы.…”

Section: методика экспериментаunclassified

“…Предварительная магнитная, гидродинамическая, электрохимическая или акустическая активация жидкости перед осуществлением процесса затворения бетонной смеси является недорогим и экологически безопасным способом повышения качества бетона, позволяющим существенно снизить затраты на его производство. Так, анализ работ [1][2][3][4][5] по омагничи-ванию воды затворения выявляет, что в итоге достигается повышение прочностных и электроизоляционных характеристик бетона и, напротив, снижение водопоглощения, общей пористости и деформации последнего. Кроме того, применение омагниченной воды позволяет решить задачу исключения из композиции дорогостоящих пластификаторов и снижения расхода цемента.…”

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INFLUENCE OF MECHANOMAGNETIC ACTIVATION OF SOLUTIONS CaCl2 AND Na2S2O3 ON PHASE STRUCTURE OF CEMENT STONE

Slizneva¹,

Akulova²,

Razgovorov³

2019

IVKKT

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The mechanism of the joint influence of the magnetic field and hydrodynamic cavitation on the properties of CaCl2 and Na2S2O3 solutions used for mixing cement pastes is considered. Hydrodynamic cavitation leads to the formation of reactive oxygen forms, HCO3– anions, carbon dioxide nanobubbles, and initiates the interaction of new forms with impurity metal cations dissolved in water. After mechanomagnetic treatment of the solutions, particles of a solid phase with sizes of 5...10 and 10...100 nm were found in them. The observed increase in the ξ- potential indicates the stabilization of such dispersed systems with the preservation of nanoscale fractions in them (up to 3 days). At the same time, the progress of reactions under the conditions of tightness that occur after cement paste has been mixed. The effect of activating factors in tap water is more pronounced than in distilled water, which is explained by the process of hydration of the carbonate ion and the formation of fine nucleation centers. Using X-ray phase analysis, it was found that, along with calcite, aragonite crystallizes in the resulting cement stone, which is practically absent in the control sample. In addition, the analysis of diffraction patterns taken on the modified samples reveals the inclusion of a carbonate ion. Obviously, optimization of the pore space in the cement stone is achieved both by clogging the pores with fine calcium carbonate, and by forming small pores during crystallization of ettringite-like phases. It is established that the resulting cement stone is characterized by increased strength (by 9-30%) and frost resistance (up to 55%) compared to that obtained by the traditional method.

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“…The use of magnetized water dates back to 1962 when some scientists from the Soviet Union made the first experiment on magnetized water to verify the use of magnetized water in the manufacture of special concrete blocks for installations of the armed forces, such as airports [16]. As mentioned before, when water passes through the magnetic field, it breaks down groups of water molecules so that they more easily penetrate cement particles, which increases their effective hydration and improves their susceptibility to concrete, and thus, improves concrete mechanical properties [14,[17][18][19]. Su and Wu [10] demonstrated that the use of magnetized water in the mixture would enhance the workability of the concrete action by up to 30% relative to the mixtures corresponding to the same water-to-cement ratios (W/C).…”

Section: Introductionmentioning

confidence: 99%

A Study for Improving Compressive Strength of Cementitious Mortar Utilizing Magnetic Water

et al. 2020

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This research investigates the means to improve the compressive strength of mortar mixtures through using novel mixtures. These mixtures include magnetic water (MW) and fly ash (FA). MW was obtained by circulating tap water (TW) through a magnetic field. The magnetization duration was represented by the number of cycles, the content of FA was replaced with cement, and the super plasticizer percentage (SP) and the curing age were used and evaluated experimentally for producing the mortar mixtures. Mortar flow, crushing compressive strength, and ultrasonic pulse velocity (UPV) tests were applied to evaluate the performances of mixing characteristics. The results demonstrate that the MW-treated mortar mixtures show higher compression strength results than those prepared by TW. The compressive strength was increased up to 60% with 150 cycles, a dose of 0.5% of SP and no FA content at the age of 56 days. The dose of SP can be cut down by a maximum of 40% to 50% in cementitious mortar. the workability was enhanced by a percentage of 70%.

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High-frequency magnetic-pulse treatment of water as a method of improving the technological properties of fine concretes

Cited by 11 publications

References 2 publications

Effects of Static Magnetic Fields on the Physical, Mechanical, and Microstructural Properties of Cement Pastes

Effects of Static Magnetic Fields on the Physical, Mechanical, and Microstructural Properties of Cement Pastes

INFLUENCE OF MECHANOMAGNETIC ACTIVATION OF SOLUTIONS CaCl2 AND Na2S2O3 ON PHASE STRUCTURE OF CEMENT STONE

A Study for Improving Compressive Strength of Cementitious Mortar Utilizing Magnetic Water

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