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Method for calculating long-age compressive strength of underground-engineering concrete mixed with fly ash

A compressive strength, underground engineering technology, applied in calculations, special data processing applications, instruments, etc., can solve problems such as failure to meet design calculations, safety evaluation and service life research, failure to reflect influence, etc., to achieve convenient use, calculation formula simple effect

Inactive Publication Date: 2017-09-29
CHINA THREE GORGES PROJECTS DEV CO LTD
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  • Claims
  • Application Information

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Problems solved by technology

[0021] Based on the above situation, the current calculation method of the full-age compressive strength is no longer suitable for the full-age calculation of the high-performance concrete compressive strength of modern underground engineering, and cannot meet the needs of design calculation, safety evaluation and service life research. The design calculation, safety evaluation and service life research of fly ash and its different fly ash content concrete underground engineering structures cannot reflect the significant differences between pumping and pumping concrete cementitious materials and their dosage and admixtures. to influence

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  • Method for calculating long-age compressive strength of underground-engineering concrete mixed with fly ash
  • Method for calculating long-age compressive strength of underground-engineering concrete mixed with fly ash
  • Method for calculating long-age compressive strength of underground-engineering concrete mixed with fly ash

Examples

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Effect test

example 1

[0079] Example 1: Concrete for the rock wall crane beam of the underground powerhouse of the hydropower station

[0080] The maximum width of the volute of the underground powerhouse of the Xiluodu Hydropower Station is 27.69m, and the diameter of the volute inlet is 7.20m. The volute concrete construction adopts layered pouring from bottom to top, the thickness of the pouring layer is about 1.50-2.0m, and the rising speed is 0.3-0.5m / h. The volute concrete design consideration is the 28-day secondary mix C25 concrete. During the structural design in the feasibility study design stage, the finite element method is used to calculate the safety under the action of dynamic and static forces at various stages from the construction period to the operation period, so it is necessary to calculate the compressive strength of the whole age.

[0081] (1) Analysis and calculation to determine the design age compressive strength of concrete

[0082] In the stage of feasibility study and...

example 2

[0108] Example 2: Concrete lining of spillway tunnel

[0109] A certain hydropower station is a large (one) type, and the flood discharge tunnel is a class I structure. The design strength grade of the lining concrete in the non-pressure section of the spillway tunnel is C 90 40 concrete. The calculation of the full-age compressive strength is required in the calculation and analysis of the safety of the lining structure during the operation period.

[0110] (1) Analysis and calculation to determine the design age compressive strength of concrete

[0111] It will take quite a long time for the spillway tunnel to be put into use after it is completed, so the 90d age design is adopted, and the concrete strength grade is C 90 40. In view of the importance of the safe operation of the spillway tunnel, the lining concrete mix ratio optimization and comprehensive design index performance tests were carried out during the bidding design process, in which different fly ash content...

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Abstract

The invention discloses a method for calculating the long-age compressive strength of underground-engineering concrete mixed with fly ash. The method includes the steps of firstly, analyzing and calculating to determine the design-age compressive strength of the concrete mixed with fly ash; secondly, calculating the 28-day compressive strength of the concrete mixed with fly ash; thirdly, calculating the long-age compressive strength of the concrete mixed with fly ash. The method has the advantages that the method is simple in calculation formula, the statistical analysis of more than 250 groups of compressive strength experiment results of the concrete, mixed with fly ash, of a large amount of actual underground engineering can reasonably reflect the relation between the compressive strength of underground-engineering concrete mixed with fly ash and the age, the relation between typical-age compressive strength and the influence of the fly ash mixing amount, the full-age compressive strength of the underground-engineering concrete mixed with fly ash can be calculated fast and precisely, and the method is completely applicable to actual engineering design calculation, safety evaluation, service life researches, fly ash mixing amount influence researches and the like and especially applicable to preliminary design and field real-time calculation and analysis.

Description

technical field [0001] The invention relates to the technical field of concrete construction engineering design calculation, safety evaluation and service life research, and research on the influence of fly ash content, in particular to a method for calculating the long-term compressive strength of fly ash-mixed concrete in underground engineering . Background technique [0002] Underground engineering has developed rapidly in recent years, its scale is getting larger and its structure is becoming more and more complex, and the requirements for its safety and service life are also getting higher and higher. When conducting complex structural design calculations, safety assessments, and service life studies, it is necessary to calculate the full-age compressive strength of the concrete for this project. [0003] The full-age compressive strength of concrete can be obtained through a series of concrete compressive tests to obtain the test values ​​of several ages, and the cal...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F17/50
CPCG06F30/13
Inventor 樊启祥段亚辉洪文浩廖建新聂庆华彭作为苏立许传稳郑斌
Owner CHINA THREE GORGES PROJECTS DEV CO LTD
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