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A Calculation Method of Critical Value of Rough Bonding Interface Roughness

A calculation method and critical value technology, applied in instruments, measuring devices, climate change adaptation, etc., can solve the problem of not involving the calculation method of critical value of material bonding interface roughness, and achieve ideal reinforcement effect, wide application range, and economical The effect of time and economic cost

Active Publication Date: 2019-07-05
SOUTHEAST UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0008] In summary, although the existing patents provide many roughness measurement methods, none of them involve the calculation method of the roughness critical value of the bonding interface of two materials

Method used

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  • A Calculation Method of Critical Value of Rough Bonding Interface Roughness
  • A Calculation Method of Critical Value of Rough Bonding Interface Roughness
  • A Calculation Method of Critical Value of Rough Bonding Interface Roughness

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Embodiment Construction

[0029] Below in conjunction with accompanying drawing, technical scheme of the present invention is described in further detail:

[0030] The present invention will be further described by taking the bonding interface between ECC and concrete as an example.

[0031] (1) Concrete with one strength and ECC with three strengths were prepared. The measured compressive strength of concrete was 49.7MPa, and the measured compressive strength of ECC was 21.7MPa, 32.6MPa, and 40.8MPa, respectively. The bonding interface of the concrete is treated to be smooth and smooth, and then the axial tensile test specimen is made in which concrete (concrete is the reinforced material 1) and ECC (ECC is the reinforced material 2) are bonded together, such as figure 1 shown;

[0032] (2) Determination of the tensile strength σ of the bonded interface between ECC and concrete in the state of flat and smooth interface j , respectively 0.12MPa, 0.31MPa, 0.73MP;

[0033] (3) A total of 6 groups of t...

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Abstract

The invention discloses a method for calculating a critical value of the roughness of a rough bonding interface. The method comprises the following steps: (1) processing to flatten and smoothen a bonding interface of a material, and producing a coaxial tension test piece in which two materials are bonded together; (2) testing coaxial tension strength sigmaj of a flattened and smoothened bonding interface of the two materials; (3) measuring the coaxial tension strengths sigma1 and sigma2 of the two bonding materials, and selecting the smaller coaxial tension strength of the two materials as a critical value sigmamin; (4) determining an average spacing d of local convex-concave parts of the rough bonding interface; (5) establishing a relation among the bonding strength sigmaj,c of the rough bonding interface, sigmaj, the average value h of height differences of local convex-concave parts of the rough bonding interface and the average spacing d of the local convex-concave parts of the rough bonding interface; (6) supposing that sigmamin is equal to sigmaj,c, and solving the height critical value hmin of the local convex-concave parts of the rough bonding interface; and (7) if a measured value h is more than hmin, determining that the stripping damage of the rough bonding interface does not occur, and if the measured value h is less than hmin, determining that the stripping damage of the rough bonding interface occurs.

Description

technical field [0001] The invention relates to the technical field of roughness detection, in particular to a method for calculating a critical value of the roughness of a rough bonding interface. Background technique [0002] With the gradual increase of concrete diseases in civil engineering, construction engineering, highway engineering, municipal engineering, and bridge and tunnel engineering, the local reinforcement and repair of concrete structures must enter a peak period. For the reinforced concrete structure, good bonding performance between the reinforcement material and the concrete interface is the basis for ensuring that the two can work together. When using engineered cement-based composite materials (Engineered Cement Composite, ECC), concrete, mortar and other repair materials to strengthen the concrete structure, under the action of axial tensile load, when the interface roughness is less than the critical value, the interface peeling failure will occur. A...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N19/04
CPCG01N19/04Y02A30/30
Inventor 王文炜田俊郑宇宙朱忠锋曹晓波
Owner SOUTHEAST UNIV
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