Effect of lime as a modifying additive on the physical and mechanical properties of special concrete
EDN: ZPLTBF
Abstract
Introduction. The paper considers possibilities for improving the physical and mechanical properties of special concretes, including heat-resistant concrete, gypsum concrete for manufacturing wall panels for industrial and civil buildings, by modifying them with lime.
Aim. To examine the structural modification of heat-resistant concrete and gypsum concrete for improving their physical and mechanical properties and increasing their durability.
Materials and methods. A finely ground additive, IM-2201 spent catalyst, was added to the heat-resistant concrete mixes. Slaked lime was used as a process activator at a concentration of 10 %, causing an increase in the compressive strength of the tested materials compared to products of the same composition with no lime added. An additive in the form of 5 and 10 % quicklime was introduced to increase the strength of gypsum concrete made from high-strength gypsum. The electrode potentials of steel in high-strength gypsum were measured.
Results. Compressive strength tests on samples of heat-resistant concrete made from Portland cement with 10 % added slaked lime revealed a strength of 32 kgf/cm2. Electrochemical studies of steel corrosion in gypsum concrete indicated that adding 10 % quicklime to gypsum concrete not only increases the strength of products but also contributes to anti-corrosion processes.
Conclusions. Heat-resistant Portland cement concretes added with IM-2201 spent catalyst and 10 % slaked lime, impregnated with 30 % orthophosphoric acid, have physical and thermal properties satisfactory for concrete operation at 800 °C. Steel reinforcement in gypsum concrete is protected by adding ground quicklime to the gypsum concrete as 10 % of the weight of the gypsum, thus enabling its use in the production of gypsum concrete panels in industrial and civil buildings.
About the Authors
S. V. SokolovaRussian Federation
Svetlana V. Sokolova*, Cand. Sci. (Engineering), Associate Professor, Associate Professor of the Department of Production of Building Materials, Products, and Structures, Samara State Technical University, Samara
Molodogvardeyskaya str., 244, Samara, 443100, Russian Federation
e-mail: sokolova9967@mail.ru
Yu. V. Sidorenko
Russian Federation
Yulia V. Sidorenko, Cand. Sci. (Engineering), Associate Professor of the Department of Production of Building Materials, Products, and Structures, Samara State Technical University, Samara
Molodogvardeyskaya str., 244, Samara, 443100, Russian Federation
e-mail: sm-samgasa@mail.ru
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Review
For citations:
Sokolova S.V., Sidorenko Yu.V. Effect of lime as a modifying additive on the physical and mechanical properties of special concrete. Bulletin of Science and Research Center of Construction. 2025;46(3):174-184. EDN: ZPLTBF
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