Pozzolanic Constituent Impact on Structure and Properties of Modified Sulfate-Based Composites

Size, shape, crystal morphology, interphase state, number and strength of an interaction among hydrated new growths are the main characteristics of gypsum structure and all of that forms physical-technical properties of the material. In this work the impact of mineral additives on structure and properties of gypsum based composites is taken into consideration by using scanning electron microscopy, energy-dispersive X-ray analysis, IR-spectroscopy. Used mineral additives include a mixture of Portland cement and a constituent which is based on different forms of silicium dioxide. As binder gypsum with grade G5 was used, as modifiers mineral additives such metakaolin, dehydrated clay, aleurolite, ceramic dust, fined mineral wool, diabase were used. It was confirmed that a combined use of modifiers improves physical-mechanical properties of gypsum binder, this effect is likely to bring about by new growths formation such as hydrated silicates and calcium aluminate hydrates. These new growths are to fill porous and void spaces in hydrated structure of gypsum binder. Also, while the composite is hardening these mineral additives play role as crystal seeds. Structure, spectral data of functional groups and local composition of new growths have been compared for modified composites with effective amount of additives. Changes in IR spectrums and microstructure have proved a suggestion about pozzolanic constituent impact on structure and properties of modified sulfate-based composites.

A.F. GORDINA, Candidate of Sciences (Engineering) (This email address is being protected from spambots. You need JavaScript enabled to view it.),
I.S. POLYANSKIKH, Candidate of Sciences (Engineering) (This email address is being protected from spambots. You need JavaScript enabled to view it.),
N.S. ZHUKOVA, Engineer (postgraduate) (This email address is being protected from spambots. You need JavaScript enabled to view it.),
G.I. YAKOVLEV, Doctor of Sciences (Engineering) (This email address is being protected from spambots. You need JavaScript enabled to view it.)

Kalashnikov Izhevsk State Technical University (7, Studencheskaya Street, Izhevsk, 426000, Russian Federation)

1. Belov V.V., Buranov А.F., Yakovlev G.I., Petropavlovskaya V.B., Fisher H.-B., Maeva I.S., Novichenkova Т.B. Modifikatsiya struktury i svoistv stroitel’nykh kompozitov na osnove sul’fata kal’tsiya: monografiya [Modification of the structure and properties of calcium sulfate-based building composites: monography] Мoscow: Publishing house De Nova. 2012. 196 p.
2. Korovyakov V.F. Modern advances in water-resistant gypsum binders. Collection of scientific works. Мoscow: State unitary enterprise NIIMosstroy. 2006. 149 p. (In Russian).
3. Chernysheva N.V., Ageeva М.S., Elyan Issa Zhyamal Issa, Drebezgova М.Yu. Influence of mineral additives of different genesis on microstructure of gypsum cement stone. Vestnik BSTU named after V.G. Shukhov. 2013. No. 4, pp. 12–18. (In Russian).
4. Panteleev А.S., Timashev V.V. Hardening of binders in the presence of crystalline additives of various structures. Stroitel’nye Materialy [Construction Materials]. 1961. No. 12, pp. 32–34. (In Russian).
5. Korolev Е.V. Nanotechnology in building materials science. Status and achievement analysis. Development paths. Stroitel’nye Materialy [Construction Materials]. 2014. No. 11, pp. 47–79. (In Russian).
6. Izotov V.S., Muhametrahimov R.H., Galautdinov А.R. Study of the effect of active mineral additives on the rheological and physical-mechanical properties of gypsum-pozzolan binder. Stroitel’nye Materialy [Construction Materials]. 2015. No. 5, pp. 20–23. (In Russian).
7. Muhametrahimov R.H., Galautdinov А.R. The role of active mineral additives of natural origin in the formation of the structure and properties of gypsum-cement-pozzolan binder. Vestnik of Kazan Technical University. 2017. No. 6, pp. 60–63. (In Russian).
8. Galautdinov А.R., Muhametrahimov R.H. Features of hydration of modified gypsum-cement-pozzolan binder. Stroitel’nye Materialy [Construction Materials]. 2019. No. 10, pp. 58–61. (In Russian). DOI: 10.31659/0585-430X-2019-775-10-58-63
9. Il’icheva О.М., Naumkina N.I., Lygina Т.Z. On the structural perfection of natural and synthetic silica. Vestnik of Kazan Technical University. 2010. No. 8, pp. 459–463. (In Russian).
10. Ignatova А. М. Rules for managing the structure and properties of stone casting material. Vestnik PNIPU. Mashinostroenie, materialovedenie. 2010. No. 3, pp. 94–102. (In Russian).
11. Yakovlev G., Gordina A., Khritankov V. ,et al. Gypsum composition with siltstone-based mineral modifier. Selected papers of the 13th International Conference “Modern Building Materials, Structures and Techniques”. Vilnius: Vilnius Gediminas Technical University. 2019, pp. 217–223. DOI: 10.3846/mbmst.2019.041
12. Khaliullin М.I., Nuriev М.I., Rakhimov R.Z., Gaifullin А.R. Influence of thermoactivated clay additive on properties of composite gypsum binder. Izvestiya KazGASU. 2016. No. 1 (35), pp. 205–210. (In Russian).
13. Petropavlovskaya V.B. Use of mineral ultrafine modifiers based on industrial waste in gypsum composites. Stroitel’nye Materialy [Construction Materials]. 2018. No. 8. pp. 18-23. (In Russian). DOI: 10.31659/0585-430X-2018-762-8-18-23
14. Segodnik D.N., Potapova Е.N. Gypsum-pozzolan binder with active mineral additive metacaolin. Uspekhi v khimii i khimicheskoi tekhnologii. 2014. No. 8 (157), pp. 77–79. (In Russian).
15. Barkovskaya S.V., Pchel’nikova V.А. Development of composite gypsum binders using expanded clay dust and glass cladding. Ekspert: teoriya i praktika. 2022. No. 3 (18), pp. 34–38. (In Russian). DOI: 10.51608/26867818_2022_3_34