Test method for measuring fracture energy of concrete based on four-point bending beam

A four-point bending and test method technology, applied in the direction of applying stable tension/compression to test the strength of materials, measuring devices, instruments, etc., can solve the problems of deflection of expansion path, large fracture area, and failure to reflect the resistance of concrete materials to fracture, etc.

Inactive Publication Date: 2019-07-05
NANJING HYDRAULIC RES INST
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Problems solved by technology

However, according to the test results of many scholars, when three-point bending beam specimens are used to measure the fracture energy of concrete, the expansion path of prefabricated joints is often deflected due to the presence of large aggregates. It can be seen from the state that once the crack is deflected, the crack tip will be subjected to both bending moment and shear force, and the exist

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  • Test method for measuring fracture energy of concrete based on four-point bending beam
  • Test method for measuring fracture energy of concrete based on four-point bending beam
  • Test method for measuring fracture energy of concrete based on four-point bending beam

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Embodiment

[0027] The test method for measuring the fracture energy of concrete based on a four-point bending beam in this embodiment adopts such as figure 1 The four-point bending beam test device shown includes: loading device 1, two indenters on the loading device 2, movable support 8, fixed support 4 and base 5, both movable support 8, fixed support 4 Installed on the base 5. When in use, the distance between the movable support 8, the fixed support 4 and the two indenters 2 can be adjusted according to the size of the test piece 3. The concrete test piece 3 is placed on the movable support 8 and the fixed support 4, and the test is performed through the indenter 2 of the loading device 1 corresponding to the loading span of the test piece.

[0028] Specific steps are as follows:

[0029] (1) Install the fixed support 4 and the movable support 8 at the two preset positions of the base 5;

[0030] (2) Install the test piece 3 with prefabricated seams at the bottom on the fixed support 4 a...

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Abstract

The invention relates to a test method for measuring fracture energy of concrete based on a four-point bending beam. The test method comprises the steps of mounting a test device and a test piece, applying a load for testing, recording test data, calculating fracture energy and the like. The test method ensures that a stress state of the test piece is simply supported, and complete load-deflectioncurve can be obtained when an initial seam height ratio is greater than or equal to 0.4 according to a test result of an applicant, wherein an initial seam height ratio for measuring fracture energyby adopting a three-point bending beam test piece recommended by a Technical Committee on Fracture Mechanics of Concrete (TC-50FMC) of an International Union of Laboratories and Experts in Construction Materials, Systems and Structures (RILEM) is 0.5.

Description

Technical field [0001] The invention relates to a test method for measuring the fracture energy of concrete based on a four-point bending beam, and belongs to the technical field of material mechanical performance testing. Background technique [0002] At present, most of the testing of the fracture energy of concrete is based on three-point bending beam specimens. The RILEM Concrete Fracture Mechanics Committee (TC-50FMC) provides a standard test method for measuring the fracture energy of concrete based on three-point bending beam specimens. However, according to the test results of many scholars, when the three-point bending beam specimen is used to measure the fracture energy of concrete, the expansion path of the precast joint is often skewed due to the presence of large aggregates. According to the force of the three-point bending beam It can be seen from the state that once the crack appears deviated, the crack tip will be simultaneously affected by the bending moment and...

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Application Information

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IPC IPC(8): G01N3/08
CPCG01N3/08G01N2203/0019
Inventor 胡少伟尹阳阳范冰张润
Owner NANJING HYDRAULIC RES INST
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