Method and program for predicting the useful life of existing buildings

By estimating the carbonation rate coefficient from concrete survey data, the method addresses the limitations of existing prediction methods, enabling accurate and simplified service life predictions for reinforced and steel-reinforced concrete buildings.

JP2026053088AActive Publication Date: 2026-03-25THE BUILDING CENT OF JAPAN
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Patent Information

Authority / Receiving Office
JP · JP
Patent Type
Applications
Current Assignee / Owner
Filing Date
2024-09-12
Publication Date
2026-03-25

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Abstract

This invention provides a versatile and simple method for predicting the service life of existing reinforced concrete and steel-reinforced concrete buildings, based on the neutralization of concrete. [Solution] A method for predicting the service life of existing reinforced concrete and steel-reinforced concrete buildings based on concrete carbonation comprises steps (1) to (3). Step (1): Arrange the carbonation depth values ​​of multiple survey locations obtained from concrete surveys of existing buildings in ascending order, and identify a representative value Cr of carbonation depth from the 50th percentile to the 100th percentile. Step (2): Substitute the representative value Cr of carbonation depth and the number of years t elapsed from completion to concrete survey into the formula Ar = Cr / √t to calculate the representative value Ar of carbonation rate coefficient. Step (3): Substitute the representative value Ar of carbonation rate coefficient and the concrete cover thickness D over the reinforcement into the formula T = D 2 / Ar 2 Substitute the values ​​and calculate the useful life T from the time of completion.
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Citation Information

Patent Citations

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