Test methods for concrete materials used in high-altitude and cold environments

By simulating low air pressure in high-altitude and frigid environments, identifying a unique effective temperature range, and constructing differential loading paths, the problem of insufficient specificity of existing testing methods in high-altitude and frigid environments is solved, and accurate characterization and comparable testing of concrete material degradation paths are achieved.

CN122042449BActive Publication Date: 2026-07-17CHINA RAILWAY TUNNEL GROUP CO LTD +1
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
CHINA RAILWAY TUNNEL GROUP CO LTD
Filing Date
2026-04-15
Publication Date
2026-07-17

AI Technical Summary

Technical Problem

Existing concrete durability testing methods are not sufficiently targeted in high-altitude and cold environments, making it difficult to reflect the actual service degradation path. Furthermore, short-cycle test results are easily affected by transient temperature gradients and measurement links, resulting in poor comparability between materials and poor interpretability of conclusions.

Method used

A concrete material testing method is designed. By simulating a high-altitude, cold, and low-pressure environment, multiple temperature setpoints are set to identify a unique effective temperature range. Two phase change loading paths are constructed, and loading with different residence times is performed within the range. The residual performance response is collected, and the equivalent degradation test conclusion is calculated.

Benefits of technology

By focusing on the critical temperature range of degradation under laboratory conditions and designing a comparative temperature history and standardizing measurement conditions, the equivalent degradation test results can be extracted directly, thereby improving the relevance and comparability of concrete material testing in high-altitude and cold environments.

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Abstract

This invention proposes a testing method for concrete materials in high-altitude and frigid environments. The method includes: subjecting a pre-defined initial moisture content concrete sample to low-temperature probing loading in a simulated high-altitude and frigid environment; setting at least three temperature setpoints within a low-temperature range covering freeze-thaw changes; collecting performance response readings to form a response sequence; determining a unique effective temperature range and the temperature at the center of change based on the response changes; constructing a first phase change loading path and a second phase change loading path, both with the same start and end temperatures and all setpoints located within the range, and the difference in residence time between the two paths not less than a preset time threshold; collecting residual performance responses after executing both paths respectively, and calculating the equivalent degradation test conclusion. This method can accurately identify the phase change sensitive zone and degradation characteristics of concrete in extreme environments, improving the comparability and engineering applicability of test results.
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Citation Information

Patent Citations

  • Method for predicting service life of concrete in high-altitude cold region

    CN117235977A

  • Intelligent temperature control method and device for fan foundation construction in alpine region

    CN120995772A