INFLUENCE OF MECHANOMAGNETIC ACTIVATION OF SOLUTIONS CaCl2 AND Na2S2O3 ON PHASE STRUCTURE OF CEMENT STONE
Abstract
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.
References
Azharonok V.V., Belous N.K., Rodtsevich S.P., Koshevar V.D., Goncharik S.V., Chubrik N.I., Orlovichc A.I. Highfrequency magnetic-pulse treatment of water as a method of improving the technological properties of fine concretes. J. Eng. Phys. Thermophy. 2009. V. 82. N 6. P. 1102-1103. DOI: 10.1007/10891-010-0311-9.
Sabapathy Y.K., Sooray K., Krishna L.K.S., Nithish V., Varadan S.V. A study on influence of magnetic water on the stregth characteristics of concrete. RJPBCS. 2019. V. 10. N 3. P. 247-252. DOI: 10.33887/rjbcs/2019.10.3.31.
Mazloom M., Miri S.M. Interaction of magnetic water, silica fume and superplasticizer on fresh and hardened properties of concrete. ACC. 2017. V. 5. N 2. P. 87-99. DOI: 10.12989/acc.2017.5.2.087.
Рыженко А.В., Рыженко В.Х., Ланкин С.В. Применение методов домола цемента и омагничивания воды для улучшения электромеханических свойств строительных бетонов. НИЖ. 2016. № 8(50). С. 86-89. DOI: 10.18454/IRJ.2016.50.074. Ryzhenko A.V., Ryzhenko V.H., Lankin S.V. Using of methods of the cement recrushing and water magnetization to improve the electromechanical properties of build-ing concrete. MNIZh. 2016. N 8(50). P. 86-89 (in Russian). DOI: 10.18454/IRJ.2016.50.074.
Gholizadeh M., Arabshahi H. The effect of magnetic water on strength parameters of concrete. JETR. 2011. V. 3. N 3. P. 77-81. DOI: 10.3923/ rjsci.2011.66.69.
Кузнецова С.Ю. Магнитные свойства воды. Усп. совр. естествозн. 2010. № 10. С. 49-51. Kuznetsova S.Yu. Magnetic properties of water. Usp. Sovr. Estestvozn. 2010. N 10. P. 49-51 (in Russian).
Kronenberg K. Experimental evidence for the effects of magnetic fields on moving water. IEEE T. Magn. 1985. V. 21. N 5. P. 2059-2061. DOI: 10.1109/TMAG.1985.1064019.
Knez S., Pohar C. The magnetic field influence on the polymorph composition of CaCO3 precipitation from carbonized aqueous solutions. J. Colloid Interface Sci. 2005. V. 281. P. 377−388. DOI: 10.1016/ j.icis.2004.08.099.
Alimi F., Tlili M., Ben Amor M., Maurin G., Gabrielli C. Influence of magnetic field on calcium carbonate precipitation in the presence of foreign ions. Электрон. обработка мат-лов. 2009. N 1. P. 65−72. DOI: 10.1016/j.desal.2006.02.064.
Gorlenko N.P., Sarkisov J.S., Laptev V.I., Sidorenko G.N., Kulchenko A.K. Regulation of confining liquid for cement systems properties by means of electromagnetic fields. IOP Conf. Ser.: Mater. Sci. Eng. 2015. V. 71. P. 012008.
Wang Y., Wang X., Yang Z. Study on impermeability mechanism of magnetic water concrete. Appl. Mech. Ma-ter. 2011. V. 99-100. P. 745-748. DOI: 10.4028/www.scientific.net/AMM.99-100.745.
Toledo E.J.L., Ramalho T.C., Magriotis Z.M. Influence of magnetic field on physical-chemical properties of the liquid water: Insights from experimental and theoretical models. J. Mol. Struct. 2008. V. 888. N 1-3. P. 409-415. DOI: 10.1016/j.molstruct. 2008.01.010.
Kugaevskaya S.A., Safronov V.N., Ermilova T.A., Abzaev Y.A., Sarkisov Y.S., Gorlenko N.P. Effect of mixing water magnetjc activation cicle on cement stone structure. IOP Conf. Ser.: Mater.Sci. Eng. Adv. Mat. Construct. Eng. 2015. V. 71. P. 012-013.
Фомичев В.Т., Ерофеев В.Т., Емельянов Д.В., Матвиевский А.А., Митина Е.А. Влияние электродных реакций в процессах электромагнитной активации природной воды на свойства бетона. Фундаментал. исслед. 2015. № 4. С. 145-151. Fomichyov V.T., Erofeyev V.T., Emel’yanov D.V., Matviyevskiy A.A., Mitina G.A. Influence of electrode reac-tions in the processes of electromagnetic activation of natural water on concrete properties. Fundamental. Issled. 2015. N 4. P. 145-151 (in Russian).
Viten’ko T.N., Gumnitskii Y.M. A Mechanism of the activating effect of hydrodynamic cavitation on water. J. Water Chem. Technol. 2007. V. 29. N 5. P. 231-237. DOI: 10.3103/S1063455X07050037.
Koksharov S.A. Bazanov A.V., Fedosov S.V., Akulova M.V., Slizneva T.E. Condition of the mechanoactivated calcium cloride solution and its influence on structural and mechanical characteristics of cement stone. Eur. Chem.-Technol. J. 2015. V. 17. P. 327-333. DOI: 10.18381/ectj277.
Mosin O., Ignatov I. Basic concepts of magnetic water treatment. Eur. J. Mol. Biotech. 2014. V. 4. N 2. P. 72-85. DOI: 10.13187/ejnr.2014.4.187.
Kalnin'sh K.K., Danilov K.L., Bykov O.D., Fokin G.A. Termochemical Transformations of Hydrocarbonate Ions in Aqueous Solutions. Russ. J. Appl. Chem. 2010. V. 83. N 9. P. 1529-1534. DOI: 10.1134/S1070427210090041.
Абзаев Ю.А., Саркисов Ю.С., Сафронов В.Н., Горленко Н.П., Кугаевская С.А., Ковалева М.А., Ермилова Т.А. Влияние цикловой магнитной обработки воды затворения на структурное состояние фаз цементного камня в различные сроки твердения. Вестн. ТГА-СУ. 2016. № 1. С. 145-154. Abzaev Yu. A., Sarkisov Yu.S., Gorlenko N.P., Kugayevskaya S.A., Kovalyova M.A., Ermilova T.A. The influence of cyclic magnetic treatment of mixing water on the structural state of the phases of cement stone in various periods of hardening. Vestn. TGASU. 2016. N 1. P. 145-154 (in Russian).
Soto-Bernal J.J., Gonzalez-Mota R., Rosales-Candelas I., Ortiz-Lozano J.A. Effects of Static Magnetic Fields on the Physical, Mechanical, and Microstructural Properties of Cement Pastes. Adv. Mater. Sci. Eng. 2015. V. 2015. P. 1-9. DOI: 10.1155/2015/934195.
