About the authors
| First name, Middle name, Last name, Scientific degree, Scientific rank, Current position. Full and brief name of the organization, The organization address. | Hamza A. Qais, Post-graduate researcher, Sana’a University, Sana’a, Republic of Yemen Email: This e-mail address is being protected from spambots. You need JavaScript enabled to view it , ORCID: 0009-0000-2805-7760 Nina N. Morozova, candidate of technical sciences, associate professor, Kazan State University of Architecture and Engineering, Kazan, Russian Federation Email: This e-mail address is being protected from spambots. You need JavaScript enabled to view it , ORCID: 0000-0002-7867-4203 Rashit K. Nizamov, doctor of technical sciences, professor, Kazan State University of Architecture and Engineering, Academic of Academy of Sciences of the Republic of Tatarstan, Kazan, Russian Federation E-mail: This e-mail address is being protected from spambots. You need JavaScript enabled to view it , ORCID: 0000-0002-3448-7369 |
| Title of the article | Gypsum-cement-pozzolan concrete with hydrophobic additives |
| Abstract. | Problem statement. Currently, there is an increase in the use of building materials based on gypsum binders in the reconstruction, repair and new construction of buildings. Unfortunately, high water absorption and low water resistance of this material limit its use for outdoor work. One of the ways to solve this problem is to use surface or volumetric hydrophobization. The purpose of the work is to evaluate the effectiveness of hydrophobing agents for gypsum cement-pozzolan concrete. For this purpose, the following tasks were solved: studying the effect of various hydrophobic liquids on the technological, mechanical and hydrophysical properties of fine-grained gypsum cement-pozzolan concrete with surface and volumetric modification; establishing an effective type of hydrophobing agent and the optimal amount. Results. The paper presents the results of studies of the effect of hydrophobing agents of various compositions on the properties of gypsum cement-pozzolan concrete. The main results of the study showed that surface hydrophobization slightly increases the average density of concrete (by 1-3%). At the same time, the increase in compressive strength was 6%, and in bending - 28% relative to the control samples. At the same time, an increase in the softening coefficient by 7% and a decrease in water absorption by 53% were noted. Volumetric hydrophobization of gypsum cement-pozzolan concrete made it possible to increase the softening coefficient of products based on the studied type of mixtures to one, reduce water absorption to 79%, increase compressive strength by 15% and bending strength by 41%. Conclusions. The significance of the obtained results for the construction industry is that the possibility of using hydrophobic additives to improve the water resistance and strength of gypsum cement-pozzolan concrete has been substantiated. |
| Keywords. | gypsum cement-pozzolan binder, hydrophobization, density, water absorption, compressive strength, bending strength, coefficient of softening |
| For citations: | Qais H.A., Morozova N.N., Nizamov R.K. Gypsum-cement-pozzolan concrete with hydrophobic additives // Izvestiya KGASU. 2024. №4(70) P.19-32. |
