AbstractAbout AuthorsReferences
The relevance of materials based on natural anhydrite is growing, since they do not have to be fired during production. These materials also have good physical and mechanical properties. Since the hydration reaction of anhydrite is slow, special additives (hardening activators) are used. Adding the different sulfates, it is possible to improve the properties of the binder. In the course of the work, strength tests of samples under compression and bending, measurements of linear deformations, determination of the hydration degree, setting time and pH were performed on samples with different content of sulfates. Samples-beams (160х40х40 mm) were tested for strength on a hydraulic press. The pH value of the mixtures was determined using an electronic pH-meter. The degree of hydration was determined by two methods: 1) interruption of hydration with isopropanol followed by drying at 45оC; 2) drying at 45оC. It is revealed that the optimal content of potassium sulfate (K2SO4) and calcium hydroxide (Ca(OH)2) gives the highest strength and degree of hydration to the binder. It is established that individual sulfates have different effects on linear deformation, the largest volume increases were observed in samples with pH=4.5-–7, and the largest shrinkage with pH=9–12.5. The influence of the sulfate activator on the fluidity of the anhydrite paste is also revealed.
A.F. BURYANOV1, Doctor of Sciences (Engineering), (This email address is being protected from spambots. You need JavaScript enabled to view it.);
H.-B. FISHER2, Doctor-Engineer, (This email address is being protected from spambots. You need JavaScript enabled to view it.);
N.A. GAL'TSEVA1, Candidate of Sciences (Engineering), (This email address is being protected from spambots. You need JavaScript enabled to view it.),
D.N. MACHORTOV1, Bachelor, (This email address is being protected from spambots. You need JavaScript enabled to view it.),
R.R. HASANSHIN1, Bachelor, (This email address is being protected from spambots. You need JavaScript enabled to view it.)
H.-B. FISHER2, Doctor-Engineer, (This email address is being protected from spambots. You need JavaScript enabled to view it.);
N.A. GAL'TSEVA1, Candidate of Sciences (Engineering), (This email address is being protected from spambots. You need JavaScript enabled to view it.),
D.N. MACHORTOV1, Bachelor, (This email address is being protected from spambots. You need JavaScript enabled to view it.),
R.R. HASANSHIN1, Bachelor, (This email address is being protected from spambots. You need JavaScript enabled to view it.)
1 National Research Moscow State University of Civil Engineering (26, Yaroslavskoe Highway, Moscow, 129337, Russian Federation)
2 Bauhaus-Universität (Coudraystraße 11, 99421 Weimar, Deutschland)
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2. Fisher H.-B., Vtorov B.B. The effect of hardening activators on the properties of natural anhydrite. II International meeting on the chemistry and technology of cement. December 4–8, 2000. Moscow. Vol. 2, pp. 53–61. (In Russian).
3. Klimenko V.G., Pavlenko V.I., Gasanov S.K. The influence of the pH of the mixing fluid on the strength properties of gypsum binders. Vestnik of the Belgorod State Technological University named after V.G. Shukhov. 2014. No. 5, pp. 16–20. (In Russian).
4. Klimenko V.G., Pavlenko V.I., Elistratkin M.Yu. Complex activators of hardening of anhydride based on ammonium sulfate. Vestnik of the Belgorod State Technological University named after V.G. Shukhov. 2013. No. 5, pp. 28–30. (In Russian).
5. Klimenko V.G. The role of double salts based on Na+, K+, Ca2+, NH4+ sulfates in the technology of producing anhydrite binders. Vestnik of the Belgorod State Technological University named after V.G. Shukhov. 2017. No. 12, pp. 119–125. (In Russian).
6. Klimenko V.G., Gasanov S.K., Kashin G.A. Studies of physicochemical processes in the system of calcium sulfate – magnetite. Vestnik of the Belgorod State Technological University named after V.G. Shukhov. 2017. No. 8, pp. 134–139. (In Russian).
7. Drebezgova M.Yu., Chernysheva N.V., Shatalova S.V. Composite gypsum binder with multicomponent mineral additives of different genesis. Vestnik of the Belgorod State Technological University named after V.G. Shukhov. 2017. No. 10, pp. 27–34. (In Russian).
8. Anikanova L.A., Kurmangalieva A.I., Volkova O.V., Pervushina D.M. The effect of plasticizing additives on the properties of gypsum materials. Vestnik TGASU. 2020. No. 1, pp. 106–117. (In Russian).
9. Kodzoev M-B., Isachenko S., Kosarev S., Basova A., Skvortzov A., AsamatdinovM., Zhukov A. Modified gypsum binder. MATEC Web of Conferences. St. Petersburg. 2017, pp. 1–7. DOI: 10.1051/matecconf/201817003022
10. Jassim Muhsin Aliewi, Abdul Qader Nihad Noori, Arshad Nadhom M. Ali. Effect of adding industrial wastes on the mechanical properties of gypsum. International Journal of Science and Research (IJSR). 2019. Vol. 8. Iss. 8, pp. 2123–2125. DOI: 10.21275/ART2020736
11. Dominic Gazdic, Jana Mokra, Jan Hanacek. Influence of Plasticizers on Properties of Anhydrite Binder. Key Engineering Materials. 2018, pp. 16–21. DOI: 10.4028/www.scientific.net/ KEM.760.16
12. Lei Yang, Min Jing, Lingchao Lu, Xiantao Song, Xiaobin Dong. Properties and micro-structures assessment of building materials based on flue gas desulfurization gypsum modified by cement and industrial waste. Ceramics-Silikaty. 2019. Vol. 63. Iss. 2, pp. 174–184. DOI: 10.13168/cs.2019.0009
For citation: Buryanov A.F., Fisher H.-B., Gal'tseva N.A., Machortov D.N., Hasanshin R.R. Research in the influence of various activating additives on the properties of anhydrite binder. Stroitel’nye Materialy [Construction Materials]. 2020. No. 7, pp. 4–9. (In Russian). DOI: https://doi.org/10.31659/0585-430X-2020-782-7-4-9