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Method for calculating compressive strength of fly ash mixed pumping concrete of underground engineering in full-age period

A technology for pumping concrete and compressive strength, applied in the directions of calculation, design optimization/simulation, special data processing applications, etc., can solve problems such as inability to meet design calculations, safety evaluation and service life research, and inability to reflect the impact, etc. Accurate calculation, easy to use, simple calculation formula effect

Inactive Publication Date: 2017-08-25
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 compressive strength of fly ash mixed pumping concrete of underground engineering in full-age period
  • Method for calculating compressive strength of fly ash mixed pumping concrete of underground engineering in full-age period
  • Method for calculating compressive strength of fly ash mixed pumping concrete of underground engineering in full-age period

Examples

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example 1

[0084] Example 1: Concrete for the rock wall crane beam of the underground powerhouse of the hydropower station

[0085] The surrounding rock of the underground powerhouse of Xiluodu Hydropower Station is basalt, which is hard. The crane beam of the main workshop adopts the rock wall crane beam structure. The top of the rock wall beam is 2.65m wide and 3.25m high, the left bank rock wall beam is 384.02m long, and the right bank rock wall beam is 387.62m long. A permanent structural joint is set between the main engine room and the installation room and each unit section. Concrete design considerations are 28-day secondary C25 pumped 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.

[0086] (1) Analys...

example 2

[0112] Example 2: Concrete lining of spillway tunnel

[0113] 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 pumped 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.

[0114] (1) Analysis and calculation to determine the design age compressive strength of concrete

[0115] 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 ...

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Abstract

The invention discloses a method for calculating compressive strength of fly ash mixed pumping concrete of underground engineering in a full-age period. The method comprises the steps of (1) performing analysis calculation to determine compressive strength of the fly ash mixed pumping concrete in a design age period; (2) calculating compressive strength of the fly ash mixed pumping concrete in an age period of 28d; and (3) calculating the compressive strength of the fly ash mixed pumping concrete in the full-age period. According to the method, a calculation formula is simple; through statistical analysis of a large amount of about 250 groups of test results of the compressive strength of the fly ash mixed pumping concrete of actual underground engineering, a relationship between the compressive strength of the fly ash mixed pumping concrete of the underground engineering and the age period, a relationship between the compressive strength in typical age periods, and the influence of fly ash content can be reasonably reflected, and the compressive strength of the fly ash mixed pumping concrete of the underground engineering in the full-age period can be quickly calculated with high precision; and the method can be completely applied to actual engineering design calculation, safety evaluation, service life research, research on the influence of the fly ash content and the like, especially primary design and field real-time calculation 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 full-age compressive strength of underground engineering pumped concrete mixed with fly ash . 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] In some full-age compressive strength calculation methods based entirely on the test, although the accuracy is high, the test time is long and the cost is hi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F17/50
CPCG06F30/23
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