Device and method for testing interlaminar tensile strength of 3D printed concrete member

A 3D printing and tensile strength technology, applied in the direction of measurement device, strength characteristics, and the use of stable tension/pressure to test the strength of materials, etc., can solve the problems to be discussed, reduce the test error, the test principle is simple and clear, improve the The effect of the test success rate

Active Publication Date: 2018-12-18
CHINA BUILDING MATERIALS ACAD
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  • Claims
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Problems solved by technology

Because it is an alternative, the split tensile test does not directly measure the interlayer axial tensile strength of 3D printed cement-based materials, and for 3D printed concrete compon

Method used

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  • Device and method for testing interlaminar tensile strength of 3D printed concrete member
  • Device and method for testing interlaminar tensile strength of 3D printed concrete member
  • Device and method for testing interlaminar tensile strength of 3D printed concrete member

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[0028] In order to make the object, technical solution and advantages of the present invention clearer, the implementation manner of the present invention will be further described in detail below in conjunction with the accompanying drawings.

[0029] The present invention provides a device for testing interlayer tensile strength of 3D printed concrete components, see Figure 1-6 , including: an indenter 1, a fixed rod 2 and a bracket 4; the indenter 1 is in contact with the indenter of the universal material testing machine;

[0030] The support 4 is composed of left and right parts, the left and right parts are symmetrical and identical, and a single support is stable and upright when placed on a horizontal plane; the upper surface of the support 1 is provided with a groove 7, and the groove 7 is close to the inner surface The first protrusion on the side of the ball is 1-5mm higher than the other protrusions, see image 3 ; The inner surface of the support 4 is provided w...

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Abstract

The invention discloses a method for testing the interlaminar tensile strength of a 3D printed concrete member. The method comprises the steps of placing test pieces between brackets, and placing a pressure head on one test piece; enabling the pressure head to be in contact with a pressure head of a universal material testing machine, starting to press down, and measuring force F during fracture;and according to the area S of the crossed part of the two test pieces, obtaining the tensile strength Pten of the 3D printed test piece, namely, indicating that Pten = F/S. According to the testing device provided by the invention, grooves are formed in the parts, in direct contact with the test piece, of the brackets, in order to concentrate force during testing on the crossed part of the two test pieces, so that a test error is reduced; and roll balls are further arranged on the brackets, so that the test pieces can be prevented from being stuck in a testing process. According to the testing device and method provided by the invention, the axial tensile strength of the 3D printed concrete member can be obtained directly; the related problems that the stress direction is not clear, the fracture surface is not controllable and the like in a pull-off method are solved; the success rate of testing is greatly improved; the testing principle is simple and clear; and the reliability is high.

Description

technical field [0001] The invention relates to the technical field of concrete structure testing, in particular to a device and method for testing interlayer tensile strength of 3D printed concrete components. Background technique [0002] At present, the 3D printing of cement-based materials is mainly based on extrusion and accumulation. The extrusion head is controlled by the program, and the layers are accumulated and formed. Unlike the traditional cement-based material pouring process, 3D printing technology involves layering and stacking to create interfaces between layers. The bonding interface is the weak point of the overall structure. When the specimen is damaged by force, the damage occurs first at the interlayer interface rather than the printed material matrix. Therefore, it is necessary to evaluate the interlayer bonding strength of 3D printed cement-based materials. [0003] The existing pull-out method (BS EN 14488–4:2005+A1:2008) tests 3D printed concrete c...

Claims

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Application Information

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IPC IPC(8): G01N3/08G01N3/02
CPCG01N3/02G01N3/08G01N2203/0017
Inventor 王振地王玲刘致远赵霞
Owner CHINA BUILDING MATERIALS ACAD
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