Carbonization and crushability of structured sand-sodium-silicate mixtures
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- Category: Contens №5 2020
- Last Updated on 30 October 2020
- Published on 30 October 2020
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Authors:
L. I. Solonenko, orcid.org/0000-0003-2092-8044, Odessa National Polytechnic University, Odesa, Ukraine, e-mail: This email address is being protected from spambots. You need JavaScript enabled to view it.
R. V. Usenko, orcid.org/0000-0002-8007-9702, National Metallurgical Academy of Ukraine, Dnipro,
Ukraine, e-mail: This email address is being protected from spambots. You need JavaScript enabled to view it.
K. I. Uzlov, orcid.org/0000-0003-0744-9890, National Metallurgical Academy of Ukraine, Dnipro,
Ukraine, e-mail: This email address is being protected from spambots. You need JavaScript enabled to view it.
A. V. Dziubina, orcid.org/0000-0002-2215-7231, National Metallurgical Academy of Ukraine, Dnipro,
Ukraine, e-mail: This email address is being protected from spambots. You need JavaScript enabled to view it.
S. I. Repiakh, orcid.org/0000-0003-0203-4135, National Metallurgical Academy of Ukraine, Dnipro,
Ukraine, e-mail: This email address is being protected from spambots. You need JavaScript enabled to view it.
Naukovyi Visnyk Natsionalnoho Hirnychoho Universytetu. 2020, (5): 040-046
https://doi.org/10.33271/nvngu/2020-5/040
Abstract:
Purpose. To identify the regularities of kinetics of carbonization process in thin layers of solidified sodium-silicate solution and to describe the mechanism of changes in surface strength of structured sand-sodium-silicate mixtures as per time.
Methodology. Determination of ultimate compressive strength and crushability resistance was carried out on samples with dimensions of Æ50 ´ 50 mm. The samples were prepared from mixtures of quartz sand and 5 % by weight of binder material (sand-sodium-silicate mixture, phenol-formaldehyde resin), as well as quartz sand cladding with sand-sodium-silicate mixture. Sand-sodium-silicate mixture carbonization kinetics was studied in a layer of hollow glass balls, previously clad with liquid sodium sand-sodium-silicate mixture. Excerpt and determination of ball mass as per duration of their staying in the air were carried out in a climatic chamber. Ball surface appearance was recorded by microscopic photographing with an up to 25 times magnification. Influence of materials-modifiers on dehydrated sodium silicate solute carbonization was investigated by visual assessment of cladding layer surface of glass balls. For this matter, glass balls of Æ10 mm were cladded with pure or modified sodium silicate solute followed by air drying for 6 hours. Cladding layer surface quality was evaluated after 48 hours of exposure in the climate chamber at 24–28 °C with 60–85 % relative humidity.
Findings. With increasing short-term storage (up to 24 hours) of structured sand-sodium-silicate mixtures in air, their strength increases and crumbling decreases. With long-term storage – strength decreases and crumbling increases. Storage of prepared sand-sodium-silicate mixtures should be carried out in a hermetically sealed container using a portion of sodium hydroxide. For the first time, kinetics of sodium-silicate mixtures carbonization in a layer 20 µm thick has been established. Based on the experimental data, kinetic curves for sodium silicate solute in clad layer carbonization are constructed. The reasons of extremum on kinetic curves presence are considered. Analytical expression for dependence of structured sand-sodium-silicate mixture crushability on the time of their staying in air has been developed. It is established that, among technological additives in sodium silicate solute tested in the work, no additive prevents or slows down the process of dehydrated sodium silicate solute in clad layer carbonization.
Originality. For the first time, kinetics of sodium-silicate mixture carbonization in a layer about 20 µm thick has been investigated. It has been established that the process of sodium-silicate mixture carbonization begins without an induction period and is of an extreme nature. For the first time, analytical dependence of structured sand-sodium-silicate mixture crushability as per time they excerpt in air has been elaborated.
Practical value. Recommendations for long-time storage of granular materials containing finely dispersed sodium silicate or clad with sodium silicate have been developed. Implementation of the recommendations will allow reducing technological losses, improving the work on strengthening soils with sodium-silicate mixture quality and improving the quality of concrete and castings produced in sand-sodium-silicate mixture forms.
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