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Self-weight influence-free concrete material fracture toughness testing method

A technology of fracture toughness and testing method, applied in the field of physical measurement, can solve problems such as failure to meet test requirements, inaccurate results, and unobtainable results

Active Publication Date: 2014-04-02
NANJING HYDRAULIC RES INST
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Problems solved by technology

However, after repeated tests, the applicant found that the calculation of crack initiation toughness and instability toughness with reference to the method in the "Hydraulic Concrete Fracture Test Regulations" is not accurate for the small-sized specimens it is applicable to; The determination of the fracture toughness of non-standard concrete members required by large joint-height ratio or large-size specimens is more inaccurate or even impossible to obtain, so it cannot meet the wider test requirements

Method used

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  • Self-weight influence-free concrete material fracture toughness testing method
  • Self-weight influence-free concrete material fracture toughness testing method
  • Self-weight influence-free concrete material fracture toughness testing method

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Embodiment

[0066] The method for testing the fracture toughness of concrete materials without the influence of self-weight of the present embodiment, such as Figure 8 , Figure 9 and Figure 10 shown, including the following steps:

[0067] 1) Erect the test beam on the two rolling bearings of the existing three-point bending beam test device, and install the load measuring device and the strain measuring device on the test beam;

[0068] The distance between two rolling bearings is 1 / 2 of the length of the test beam, and the distance from each rolling bearing to one end of its adjacent test beam is 1 / 4 of the length of the test beam;

[0069] For the existing three-point bending beam test device, refer to the test device in 6.2 of the "Hydraulic Concrete Fracture Test Regulations". The load measuring device is set on the top surface of the test beam, using a load sensor with an accuracy of not less than 1%. The strain measurement device in this embodiment is a resistance strain gau...

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Abstract

The present invention relates to a self-weight influence-free concrete material fracture toughness testing method, and belongs to the technical field of physical measurements. The determination method comprises: 1) erecting a test beam on two rolling bearings of the current three-point bending beam test device, and arranging a load measurement device and a strain measurement device on the test beam; 2) measuring the applied maximum load Fmax through the load measurement device, and measuring an initiation fracture load FQ through the strain measurement device; and 3) calculating an unstable toughness and an initiation fracture toughness. With the self-weight influence-free concrete material fracture toughness testing method, influence of the member self-weight on the testing result is eliminated so as to accurately determine the concrete initiation fracture and unstable toughness and meet the initiation fracture and unstable toughness determination requirements of the concrete material (including hydraulic concrete) of the high crack-depth ratio or large size specimen.

Description

technical field [0001] The invention relates to a method for testing the fracture toughness of concrete materials without the influence of self-weight, and belongs to the technical field of physical measurement. Background technique [0002] In the evaluation of the stability of crack propagation in concrete structures and the anti-crack and anti-crack design of concrete buildings, it is necessary to provide concrete fracture toughness parameters. The fracture toughness parameters of concrete include crack initiation toughness and instability toughness. [0003] Determination of the fracture toughness of concrete materials can refer to the provisions of the Electric Power Industry Standard of the People's Republic of China "Hydraulic Concrete Fracture Test Regulations", using the wedge splitting method and the three-point bending beam method for determination, and the tests of the two methods are carried out at the same time. In case of discrepancies in the results, the thr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N3/20
Inventor 胡少伟安康陆俊
Owner NANJING HYDRAULIC RES INST
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