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Method and device for measuring bonding strength between reinforcing steel and concrete under action of pre-stress

A bonding strength and measuring device technology, applied in the direction of measuring devices, mechanical devices, instruments, etc., can solve the problem that there is no specific method for the bonding strength of steel bars and concrete, and achieve good sealing performance, wide application, and guaranteed sealing performance Effect

Inactive Publication Date: 2012-06-27
BEIJING JIAOTONG UNIV
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  • Abstract
  • Description
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Problems solved by technology

[0003] In summary, the existing methods can only measure the bond strength between steel bars and concrete in ordinary reinforced concrete, and there is no specific method for measuring the bond strength between steel bars and concrete under the action of prestress.

Method used

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  • Method and device for measuring bonding strength between reinforcing steel and concrete under action of pre-stress
  • Method and device for measuring bonding strength between reinforcing steel and concrete under action of pre-stress
  • Method and device for measuring bonding strength between reinforcing steel and concrete under action of pre-stress

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Embodiment Construction

[0040] The present invention will be further described below in conjunction with accompanying drawing:

[0041] The present invention first cuts the steel bar and the stainless steel sleeve pipe with measurement into the required length of the test (such as Figure 11 Shown) [the length of the steel bar is 230mm, the length of the stainless steel casing is 8mm], the concrete cube specimen is poured, the specimen size is 150×150×150 (mm), and it is poured in the horizontal direction. Remove the mold after 24 hours of pouring, and then put it into the curing room under standard conditions (room temperature 20±2°C, relative humidity above 95%), and perform the test after curing to the age (the standard curing age is 28d). Put the test piece into the oil pressure chamber and seal it on the universal testing machine. The oil pressure is manually increased to the required value by the SYB-2 hydraulic pump. A universal testing machine with a maximum sustained load of 100KN is used f...

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Abstract

The invention discloses a method for measuring bonding strength between reinforcing steel and concrete under the action of pre-stress. The method comprises the steps of casting a test piece, increasing oil pressure, loading and measuring a value of the bonding strength between the reinforcing steel and the concrete. The invention further provides a measuring device special for the measuring method. The device comprises a testing machine, a computer control system connected with the testing machine and a hydraulic pump system, wherein the testing machine comprises a counterforce frame; a counterforce transverse beam is arranged on the counterforce frame; an upper jaw is arranged on the counterforce transverse beam; a lower jaw is arranged at the lower end corresponding to the upper jaw; anoil pressure cavity is clamped and held between the upper jaw and the lower jaw; the test piece is installed in the oil pressure cavity; the reinforcing steel at the upper end of the test piece extends out of the oil pressure cavity and is clamped and held by the upper jaw; and a bottom plate of the oil pressure cavity is clamped and held by the lower jaw. By adopting a pressurizing method through the oil pressure cavity, the disadvantages of being incapable of applying pre-stress or unequal in aeolotropic pressure and stress concentration phenomenon and inaccurate for measurement caused by the above problems in the general method are overcome.

Description

technical field [0001] The present invention relates to a kind of technical field of civil engineering, specifically, the present invention relates to a kind of measuring method of the bonding strength of steel bar and concrete under the action of prestressing, and the method for measuring the bonding strength of reinforcing bar and concrete under the action of prestressing Measuring device. Background technique [0002] At present, in a large number of concrete structures under construction and use, prestressed steel bars and steel strands have been used more and more, and the technology is becoming more and more mature; for example, in bridges, silos, chimneys, and large cantilever structures. In addition, it is also used more and more commonly in important components such as prefabricated beams and columns, and in the field of engineering reinforcement, after the structural components are reinforced, the structure is equivalent to applying a pre-stress to the passive stru...

Claims

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Application Information

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IPC IPC(8): G01N19/04
Inventor 周长东侯平阳李慧厉春龙
Owner BEIJING JIAOTONG UNIV
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