Justification for the use of modified concrete for foundations of overpass supports
https://doi.org/10.37538/0005-9889-2024-3(622)-20-25
Abstract
Introduction. The article discusses the possibilities and prospects of using modified concrete for the foundations of overpass supports.
The aim is to study the effect of various additives on the sulfate resistance of the foundations of bridge supports and overpasses.
Materials and methods. To achieve this goal, tests of reinforced concrete samples were carried out with the introduction of various additives into the concrete mixture. As part of the study, a MasterLife® WP 3760 modifying additive was selected. Using this additive, experiments were conducted with an accelerated assessment of the effect on the sulfate resistance of concrete based on general-purpose Portland cement. In accelerated tests, the sulfate resistance of concretes with the studied additive was performed in comparison with concretes of the same composition prepared on sulfate-resistant and general-purpose Portland cement without additional additives. The water-cement ratio in all tested formulations remained constant.
Results. Samples made of general construction cement with the addition of MasterLife® WP 3760 after performing the specified test cycles in a sulfate medium showed a decrease in compressive strength by 3 % from their initial values. The residual strength of concrete samples with MasterLife® WP 3760 additive was 97 %, which exceeds the resistance of concrete to sulfate-resistant cement, the remaining strength of which is 94 %. The MasterLife® WP 3760 additive is a substance that significantly reduces the permeability of concrete due to "blockage" by particles of the substance or neoplasms of pores and capillaries of concrete, these substances due to physical and chemical processes lead to homologation, a decrease in the permeability of concrete, and, as a result, an increase in frost resistance and corrosion resistance.
Conclusion. As a result of the action of the MasterLife® WP 3760 additive, the corrosion resistance of concretes and mortars increases, including resistance to sulfate aggression, by reducing water permeability. Thus, it becomes possible to eliminate cracks in concrete with an opening width of up to 0.4 mm and extend the durability of concrete.
About the Authors
N. E. Urmanshina
Ufa State Petroleum Technological University
Russian Federation
Russian Federation
Natalia E. Urmanshina*, Cand. Sci. (Engineering), Associate Professor, Associate Professor of the Department of Highways, Bridges and Transport Structures, Ufa State Petroleum Technological University, Ufa
e-mail: adtsp@mail.ru
tel.: +7 (917) 347-62-40
Z. R. Mukhametzyanov
Ufa State Petroleum Technological University
Russian Federation
Russian Federation
Zinur R. Mukhametzyanov, Dr. Sci. (Engineering), Associate Professor, Professor of the Department of Highways, Bridges and Transport Structures, Ufa State Petroleum Technological University, Ufa
e-mail: zinur-1966@mail.ru
tel.: +7 (917) 780-35-05
References
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Review
For citations:
Urmanshina N.E., Mukhametzyanov Z.R. Justification for the use of modified concrete for foundations of overpass supports. Concrete and Reinforced Concrete. 2024;622(3):20-25. (In Russ.) https://doi.org/10.37538/0005-9889-2024-3(622)-20-25
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