Alkali-Aggregate Reaction Deformation Control Method for High Arch Dam Concrete

Abstract

The invention discloses a method for controlling the alkali-aggregate reaction deformation of high arch dam concrete, simulating the expansion deformation of arch dam concrete alkali-aggregate reaction: predicting the expansion deformation value that may be caused by the alkali-aggregate reaction of arch dam concrete, and adopting the overall temperature rise of the dam body Simulate the alkali-aggregate reaction expansion deformation of arch dam concrete by using the method; analyze the impact of alkali-aggregate reaction expansion deformation on the long-term safety of arch dams. Aiming at the alkali-aggregate reaction problem of high arch dams, the present invention establishes an analysis method considering the influence of alkali-aggregate reaction expansion and deformation on the long-term safety of arch dams, and proposes a control index for allowing alkali-aggregate reaction expansion and deformation of dam concrete, and inhibiting concrete Alkali-aggregate reaction has adverse effects on the dam, and then a set of high arch dam concrete alkali-aggregate reaction deformation control technology has been established, which has achieved a technological breakthrough in the combination of concrete alkali-aggregate reaction and arch dam structure design. It is of great significance to ensure the long-term safe operation of high arch dams.

Description

technical field [0001] The invention relates to the field of hydraulic engineering, in particular to a method for controlling deformation of high arch dam concrete by alkali-aggregate reaction. Background technique [0002] Alkali-aggregate reaction refers to the chemical reaction between the alkaline substances in concrete and the active components in aggregate, which causes uneven expansion of concrete, resulting in cracking and even destruction. Alkali-aggregate reaction failure (AAR) occurs inside the concrete and continues continuously, making repair and reinforcement very difficult and sometimes even requiring reconstruction. For more than half a century, alkali-aggregate reaction damage has caused huge losses worldwide, especially for hydraulic concrete structures, where the humid environment and long life requirements provide excellent conditions for alkali-aggregate reaction. Environmental conditions and time guarantee. [0003] The serious consequences caused by ...

AI Technical Summary

Problems solved by technology

In recent years, many water conservancy projects have begun to pay attention to the problem of alkali-aggregate reaction. More and more projects conduct alkali activity tests on aggregates before construction, and take active measures to prevent the occurrence of alkali-aggregate reactions, such as in concrete. Using combined aggregates, mixing slag, fly ash, volcanic ash and other active materials, and controlling the total alkali content of concrete and other engineering measures to inhibit the alkali-aggregate reaction, but the long-term effectiveness needs to be demonstrated

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