Method for setting up secondary lining concrete crushing strength curve after tunnel fire

A compressive strength, secondary lining technology, applied in the direction of applying stable tension/pressure to test material strength, strength characteristics, and test material hardness, etc., can solve problems such as judgment of unsuitable concrete compressive strength, and achieve damage level Reasonable judgment and the effect of reducing errors

Inactive Publication Date: 2019-01-04
CHINA JILIANG UNIV
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Problems solved by technology

This method has been widely used in concrete engineering in our country, and the corresponding national technical regulations have been formulated, and special strength measurement curves and calculation formulas have been established. Determination of concrete compressive strength

Method used

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  • Method for setting up secondary lining concrete crushing strength curve after tunnel fire
  • Method for setting up secondary lining concrete crushing strength curve after tunnel fire
  • Method for setting up secondary lining concrete crushing strength curve after tunnel fire

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Embodiment Construction

[0024] The present invention will be further described in detail below in conjunction with the accompanying drawings, implementation examples and specific experimental data.

[0025] like figure 1 As shown, the present invention establishes the compressive strength curve of the secondary lining concrete after fire through test block production, test block maintenance, high temperature test, ultrasonic test, rebound test, pressure test and test data analysis. Specific steps are as follows:

[0026] The first step, test block production: use ordinary Portland cement with 32.5 strength grade, crushed stone coarse aggregate with an average particle size of 30mm, yellow sand (coarse sand) fine aggregate, and tap water as raw materials, according to 1:0.45:1.36 : The mix ratio design of 3.03 is in line with the c30 test block of the concrete strength level of the secondary lining of the tunnel. The same temperature level includes 6 standard test blocks of 150mm*150mm*150mm and 2 n...

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Abstract

The invention discloses a method for setting up a secondary lining concrete crushing strength curve after a tunnel fire. According to the method, a residual crushing strength calculation formula is obtained through briquette manufacturing, briquette maintaining, high-temperature testing, ultrasonic testing, rebound testing, pressure testing and test data reduction and analysis, and the concrete crushing strength curve after the tunnel fire is set up. During actual detection, only one face is available for detection in a tunnel, and a flat measuring method is more suitable for single-face detection compared with an opposite measuring method. Opposite measuring sound velocity is adopted in a strength measuring formula, actual flat measuring sound velocity needs to be used after being corrected, and the opposite measuring sound velocity and the flat measuring sound velocity have a good linear relation; and the actually measured flat measuring sound velocity is substituted into the strength measuring formula after being corrected, and the concrete residual crushing strength can be determined. Meanwhile, by means of the flat measuring method, errors caused by inaccurate centering of a transmit-receiving probe in the opposite measuring method can be reduced. The method has important practical significance on fast detection of the damage degree of a lining structure after the tunnel fire accident and damage grade reasonable judgment.

Description

technical field [0001] The invention belongs to the technical field of concrete, and in particular relates to a method for establishing a compressive strength curve of secondary lining concrete after a tunnel fire. Background technique [0002] The ultrasonic rebound comprehensive method is a method for evaluating the compressive strength of ordinary concrete in industrial and civil buildings and general structures. This method has been widely used in concrete engineering in our country, and the corresponding national technical regulations have been formulated, and special strength measurement curves and calculation formulas have been established. Determination of the compressive strength of concrete. [0003] Because the hardness of the concrete surface subjected to fire can reflect the degree of fire damage; the ultrasonic wave velocity passing through the concrete will also change regularly, so the ultrasonic rebound comprehensive method is suitable for judging the compr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N3/08G01N3/52G01N25/00G01N29/07
CPCG01N3/08G01N3/52G01N25/00G01N29/07G01N2203/0019G01N2203/0676G01N2291/011G01N2291/0232
Inventor 翟子泰王强朱凯李海航
Owner CHINA JILIANG UNIV
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