BUILDING MATERIALS AND PRODUCTS

Original article

https://doi.org/10.24866/2227-6858/2024-4/115-129 

Chernysheva N.V., Drebezgova M.Yu., Kovalenko E.V., Fedyuk R.S., Nagruzova L.P.

Natalia V. Chernysheva – Doctor of Engineering Sciences, Professor, Peter the Great St. Petersburg Polytechnic University (Saint Petersburg, Russian Federation); Professor of Belgorod State Technological University named after V.G. Shukhov (Belgorod, Russian Federation), chernysheva56@rambler.ru, https://orcid.org/0000-0001-8376-5065

Maria Yu. Drebezgova – Candidate of Engineering Sciences, Associate Professor of the Higher School of Design and Architecture, Peter the Great St. Petersburg Polytechnic University (Saint Petersburg, Russian Federation), mdrebezgova@mail.ru, https://orcid.org/0000-0002-8458-1951

Elena V. Kovalenko – Applicant, Belgorod State Technological University named after V.G. Shukhov (Belgorod, Russian Federation), elenadmitriev@yandex.ru, https://orcid.org/0000-0001-5678-6557

Roman S. Fediuk – Doctor of Engineering Sciences, Associate Professor, Professor of the Military Training Center at the Far Eastern Federal University (Vladivostok, Russian Federation), roman44@yandex.ru, https://orcid.org/0000-0002-2279-1240

Lyubov P. Nagruzova – Doctor of Engineering Sciences, Associate Professor, Professor of N.F. Katanov Khakass State University (Abakan, Russian Federation), l_nag@bk.ru, https://orcid.org/0009-0002-7295-6557

Water-resistant and frost-resistant fine-grained concrete based on composite gypsum binder

Abstract. Facade and finishing tiles made of fine-grained gypsum cement concrete, imitating natural stone, is a rapidly developing promising building material. However, due to the presence of gypsum, finishing materials based on it do not have high enough water resistance and frost resistance, which significantly reduces the scope of their use. The article presents the results of experimental studies of the physico-mechanical characteristics of a water-resistant composite gypsum binder (CGB) with a mineral additive of finely dispersed highly active methacaolin VMK-45 and a complex of organic additives (Melflux 1641 F superplasticizer and hydrophobic dispersible polymer powder Vinnapas 8034H), as well as fine-grained concrete based on CGB for exterior decoration of facades of buildings and structures. It was found that with the additional introduction of VMK-45 metakaolin into the composition of CGB (5% of the weight of the portland cement) with the same flowability of the gypsum cement mixture, the process of beginning and end of setting is slightly accelerated (from 4-30 to 4-00 minutes and from 6-00 to 5-30 minutes respectively), the indicators of compressive strength of hardened samples increase CGB: in the first 2 hours of hardening by 11% (from 5,8 to 6,5 MPa) and at the age of 28 days by 2,2 times (from 6,0 to 16,0 MPa) in comparison with samples without additives, and the value of the softening coefficient increases from 0,65 to 0,78. Fine-grained concretes with compressive strength of 17 MPa (2 hours), 29 MPa (2 days), 33 MPa (7 days) and 45 MPa (28 days) were obtained on the basis of the developed CGS. Compositions of fine-grained concrete based on CGB of class B20-B22,5 with a ratio of "filler" have been developed : CGB – 1:1", with a softening coefficient of 0,9, the frost resistance mark F150, which fully meets the requirements for their use for outdoor.

Keywords: active mineral additives, composite gypsum binder, fine-grained concrete, properties

See the reference in English at the end of the article

For citation: Chernysheva N.V., Drebezgova M.Yu., Kovalenko E.V., Fedyuk R.S., Nagruzova L.P. Water-proof and frost-resistant fine-grained concrete based on composite gypsum binder. FEFU: School of Engineering Bulletin, 2024, no. 4(61), pp. 115–129. (In Russ.).