Test method of novel prefabricated crack Z-shaped concrete shear strength test piece
A technology of prefabricated cracks and shear strength, applied in the direction of applying stable shear force to test material strength, strength characteristics, measuring devices, etc., can solve the problems of waste material testing, large size and difficulty of test specimens, etc.
Pending Publication Date: 2022-04-26
NANTONG INST OF TECH
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Problems solved by technology
Due to the large diameter of the aggregate, which generally exceeds 250mm, the size of the test specimen produced is too large, which wastes material and is difficult to test
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[0022] In order to make the technical means, creative features, goals and effects achieved by the present invention easy to understand, the present invention will be further described below in conjunction with specific embodiments.
[0023] Such as Figure 1 to Figure 6 Shown, the test method of a kind of novel prefabricated crack Z-shaped concrete shear strength test specimen, comprises the following test steps:
[0024] Step 1: using self-compacting rockfill concrete as a filling material, and pouring a Z-shaped test specimen 20 as a whole through the preparation mold 10;
[0025] Step 2: symmetrically process vertically oriented prefabricated cracks 20a on the left and right sides of the test specimen 20 by cutting equipment;
[0026] Step 3: apply evenly distributed pressure on the upper and lower sides of the test piece 20 through hydraulic equipment;
[0027] Step 4: When the test piece 20 cracks between the prefabricated cracks 20a on both sides, the experiment is com...
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The invention discloses a test method of a novel prefabricated crack Z-shaped concrete shear strength test piece. The test method comprises the following test processes: (1) integrally pouring a Z-shaped test piece through a preparation mold; (2) symmetrically processing vertical prefabricated cracks on the left side and the right side of the test piece through cutting equipment; (3) applying uniformly distributed pressure on the upper side and the lower side of the test piece through hydraulic equipment; and (4) when the test piece cracks between the prefabricated cracks on the two sides, completing the experiment. The device is mainly used for testing the shear strength of a large-size rock-fill concrete material, and if a beam type test piece is manufactured, the size of the test piece is too large, the test condition requirement is too high, and the shear failure process is difficult to control. The test piece is manufactured according to a traditional Z-shaped test piece, and an ideal shear failure surface cannot be realized due to the fact that rock-fill concrete cannot be provided with reinforcing steel bars. Due to the stress concentration effect, the depth of the prefabricated crack can be controlled by comparing with the shear test result of the beam type test piece, and the precision of the test method is revised.
Description
technical field [0001] The invention relates to the technical field of testing the mechanical properties of large-scale rockfill concrete, in particular to a testing method for a novel prefabricated cracked Z-shaped concrete shear strength test specimen. Background technique [0002] Self-compacting rockfill concrete is used in the construction of large dams, and its shear strength is a very important mechanical performance index. Because of the large diameter of the aggregate, which generally exceeds 250mm, the size of the test specimen produced is too large, which wastes material and makes testing difficult. Since the steel bars cannot be arranged inside the test specimen, it is almost impossible to make other relatively small shear test specimens except the beam shear specimen. [0003] Therefore, it is necessary to find a test piece that is as small as possible and convenient to test, and can meet the requirements of traditional test conditions and analysis methods. C...
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IPC IPC(8): G01N3/24G01N3/02
CPCG01N3/24G01N3/02G01N2203/0003G01N2203/0025G01N2203/0048G01N2203/0064G01N2203/0298
Inventor 王海超刘成和何世钦金锋安雪晖林青松李世荣崔建荣姜佩弦王露张灵灵
Owner NANTONG INST OF TECH