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High arch dam concrete alkali-aggregate reaction deformation control method

A deformation control, concrete technology, applied in special data processing applications, instruments, electrical digital data processing, etc.

Active Publication Date: 2021-07-30
CHINA INST OF WATER RESOURCES & HYDROPOWER RES +3
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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

Method used

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  • High arch dam concrete alkali-aggregate reaction deformation control method
  • High arch dam concrete alkali-aggregate reaction deformation control method
  • High arch dam concrete alkali-aggregate reaction deformation control method

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Embodiment 1

[0035] The present invention adopts a concrete extra-high arch dam with a crest elevation of 1885m, a base elevation of 1580m, and a maximum dam height of 305m.

[0036] A: Simulation of alkali-aggregate reaction expansion deformation of arch dam concrete.

[0037] Predict the expansion and deformation value of arch dam concrete alkali-aggregate reaction that may be caused, and equivalent the possible expansion deformation value of concrete to the corresponding temperature increase, and simulate the expansion of arch dam concrete alkali-aggregate reaction by increasing the overall temperature of the dam body Deformation The coefficient of linear expansion of the concrete in this project is 8.5×10-6 / °C, and the temperature load increment corresponding to the expansion deformation value that may be caused by the concrete alkali-aggregate reaction is calculated according to the above formula, and the calculation results are shown in the table below:

[0038] Temperature load incr...

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Abstract

The invention discloses a high arch dam concrete alkali-aggregate reaction deformation control method which comprises the steps: simulating arch dam concrete alkali-aggregate reaction expansion deformation: predicting an expansion deformation value possibly caused by an arch dam concrete alkali-aggregate reaction, and simulating the arch dam concrete alkali-aggregate reaction expansion deformation by adopting a dam body overall heating mode; and analyzing the influence of alkali-aggregate reaction expansion deformation on the long-term safety of an arch dam. Aiming at the problem of alkali-aggregate reaction of the high arch dam, an analysis method considering the influence of alkali-aggregate reaction expansion deformation on the long-term safety of the arch dam is established, and an alkali-aggregate reaction expansion deformation control index allowed by dam concrete and engineering measures for inhibiting the adverse influence of the concrete alkali-aggregate reaction on the dam are provided; therefore, a whole set of high arch dam concrete alkali-aggregate reaction deformation control technology is established, the technical breakthrough of combining the concrete alkali-aggregate reaction subject and the arch dam structure design is realized, and the method has important significance for guaranteeing long-term safe operation of the high arch dam.

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 ...

Claims

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Application Information

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IPC IPC(8): G06F30/23G06F119/14
CPCG06F30/23G06F2119/14
Inventor 程恒刘毅周秋景张敬张国新薛利军毛延翩杨宁黄海龙刘顶明乔雨姚孟迪杨波雷峥琦顾艳玲江晨芳吴龙珅徐秀鸣张家豪高宇欣
Owner CHINA INST OF WATER RESOURCES & HYDROPOWER RES
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