A method for designing the composition of limestone powder-containing TSA-resistant cementitious materials for tunnel concrete.

By designing the cementitious material composition of tunnel concrete containing limestone powder, the problem of TSA erosion of limestone powder in low-temperature sulfate environment was solved, thereby improving the corrosion resistance of tunnel concrete and the controllability of materials, making it adaptable to different corrosive environments and widely applicable.

CN117577233BActive Publication Date: 2026-06-30RES INST OF HIGHWAY MINIST OF TRANSPORT
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
RES INST OF HIGHWAY MINIST OF TRANSPORT
Filing Date
2023-11-16
Publication Date
2026-06-30

AI Technical Summary

Technical Problem

In the existing technology, the use of limestone powder in a low-temperature sulfate environment is prone to carbon-sulfur-silica-calcium sulfate attack (TSA), and conventional inhibitors such as barium salts have failed to completely prevent the attack, causing material compatibility problems and making it difficult to promote widely.

Method used

This paper provides a design method for the composition of limestone powder-containing TSA-resistant cementitious materials in tunnel concrete. By determining the low-temperature sulfate environment with different corrosion levels, the maximum dosage of limestone powder is determined. Combined with the composition and proportion of highly active auxiliary cementitious materials, a material-saving target that meets the durability design requirements of concrete is designed.

Benefits of technology

This method achieves improved TSA resistance of tunnel concrete under different low-temperature sulfate environments through scientific and reasonable composition design. The materials are readily available, the quality is controllable, and it covers most low-temperature sulfate environments, with broad prospects for promotion and application.

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Abstract

This invention discloses a method for designing the composition of a limestone powder-containing TSA-resistant cementitious material for tunnel concrete, comprising the following steps: Step 1, determining the TSA erosion environment level of the tunnel structure concrete; Step 2, determining the mass dosage W of highly active cementitious material per cubic meter of concrete. CM Step 3: Determine the mass percentage R of tricalcium aluminate in the highly active cementitious material. C3A Step 4: Determine the type and composition of the high-activity cementitious material; Step 5: Determine the mass quantity (W) of stone powder used as a low-activity cementitious material per cubic meter of concrete. LS Step 6: Determine the composition and mass percentage of cementitious materials in a single cubic meter of concrete. Since all materials involved in this method are mature and widely used, they are readily available, their quality is controllable, and their indicators are easy to obtain. Furthermore, this method can provide corresponding material composition designs for different low-temperature sulfate attack environments, making it highly targeted, covering most low-temperature sulfate environments, and has broad prospects for widespread application.
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Citation Information

Patent Citations

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