Tensile loading device for testing permeability of concrete chloride ions and application thereof

A technology for chloride ion penetration and concrete specimens, which is applied in the direction of measuring devices, permeability/surface area analysis, suspension and porous material analysis, etc., and can solve the problem that it is impossible to apply various loads to the tested specimens, and the devices and methods are not considered. problem, to achieve the effect of stable test results, stable load, and simple device structure

Inactive Publication Date: 2011-05-04
HOHAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the standard (ASTM C1202) formulated by the American Society for Standards and Testing of Materials (ASTM C1202) adopted by many countries to evaluate the ability of concrete to resist penetration of chloride ions is to apply a DC voltage of 60 V at both ends of a Φ95×50 mm concrete sample. The permeability of concrete is evaluated by detecting the amount of electricity flowing within 6 hours. The devices and methods used do not consider and cannot implement various loads on the test piece at the same time
Patent CN 101699267 A in the announcement (application number 200910212680.2) discloses a loading device and method for testing the c

Method used

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  • Tensile loading device for testing permeability of concrete chloride ions and application thereof
  • Tensile loading device for testing permeability of concrete chloride ions and application thereof
  • Tensile loading device for testing permeability of concrete chloride ions and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] Example 1 Coulometric Test of Concrete Chloride Ion Permeability Tensile Load Loading Device

[0044] The electric method test tensile loading device of the chloride ion permeability of concrete is composed of a steel base plate 1, a screw rod 2, a compression spring 3, a stretching steel plate 4, a tensioning steel plate positioning bolt cap 5, a pressurized steel plate positioning bolt cap 6, and a Pressure plate 7, fixed bolt cap 8 under the top plate, top plate 9, fixed bolt cap 10 on the top plate, jack 11, pressure dynamometer 12, tension screw rod 13, tension screw rod fixed bolt cap 14, through-hole ball seat 15, pull Stretch sensor 16 constitutes;

[0045] Steel bottom plate 1, stretched steel plate 4, pressurized steel plate 7 and top plate 9 are all squares with a side length of 500 mm, the thickness of steel bottom plate 1 is 30 mm, and the thickness of stretched steel plate 4, pressurized steel plate 7 and top plate 9 are is 20 mm;

[0046] There is an ...

Embodiment 2

[0048] Example 2 Coulometric test of chloride ion permeability of concrete Tensile load loading method - four specimens with equal load

[0049] Loosen the set bolt cap 6 of the pressurized steel plate, pressurize the pressurized steel plate 7 with a jack 11, the pressure is displayed by the pressure dynamometer 12, and when it reaches 44 kN, tighten the set bolt cap 5 of the stretched steel plate, at this time four The compression spring 3 bears a pressure of 44 kN in total; the pull-down of the concrete specimen 18 with a length of 100 mm, a thickness of 55 mm, and a height of 200 mm bonded with an upper tension connector 17 and a lower tension connector 20 at four ends Stretch connector screw rod 20 is screwed into four screw holes on the periphery of steel base plate 1, and upper stretch connector 17 is connected with corresponding stretch dynamometer 16;

[0050] Slowly loosen the anchor bolt caps 5 of the stretched steel plates, and adjust the four stretched screw fixi...

Embodiment 3

[0051] Example 3 Coulometric test of chloride ion permeability of concrete

[0052] Loosen the set bolt cap 6 of the pressurized steel plate, pressurize the pressurized steel plate 7 with the jack 11, the pressure is displayed by the pressure dynamometer 12, when it reaches 33 kN, tighten the set bolt cap 5 of the stretched steel plate, at this time four The compression spring bears a total pressure of 33 kN; the four ends are bonded with the upper tensile connector 17 and the lower tensile connector 20 with a side length of 100 mm, a thickness of 55 mm, and a concrete specimen 18 with a height of 200 mm. Stretch connector screw rod 20 is screwed into four screw holes on the periphery of steel base plate 1, and upper stretch connector 17 is connected with corresponding stretch dynamometer 16;

[0053] Slowly loosen the positioning bolt caps 5 of the stretched steel plates, and adjust the four stretching screw fixing bolt caps 14, observe the tensile force values ​​displayed ...

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Abstract

The invention relates to a device for testing the permeability of concrete chloride ions and application thereof. A tensile loading device for testing the permeability of the concrete chloride ions by an electric quantity method is characterized in that: a screw rod between a steel bottom plate and a tensile steel plate is provided with a compression spring; a screw rod on the upper part of the tensile steel plate is sleeved with a tensile steel plate positioning bolt cap; a screw rod on the lower part of a compression steel plate is sleeved with a compression steel plate positioning bolt cap; screw rods on the upper part and lower part of a top plate are sleeved with a lower top plate fixing bolt cap and an upper top plate fixing bolt cap respectively; the middle points of four sides of the steel bottom plate are provided with threaded holes; the tensile steel plate is provided with a through hole which corresponds to the threaded holes; a tensile screw rod is arranged in the through hole; the tensile screw rod is sleeved with a ball seat which is provided with upper and lower through holes and a fixing bolt cap on the upper part of the tensile steel plate; and the lower end of the tensile screw rod is connected with a tensile dynamometer. The problem that the conventional device for testing the permeability of the concrete chloride ions cannot apply continuous tensile load to a tested piece is solved.

Description

technical field [0001] The invention relates to a test device for measuring the chloride ion permeability of concrete and its application, in particular to a loading device and a test method for measuring the chloride ion permeability of concrete under the condition of continuous tensile load. Background technique [0002] For reinforced concrete structures such as seaport terminals, underground engineering, water conservancy and hydropower engineering structures, the water permeability and chloride ion permeability of concrete are one of the most important performance indicators. Chloride ion permeability is not only an important indicator of the ability of concrete to resist chloride ion erosion and protect steel bars from erosion in reinforced concrete, but also characterizes the water permeability of concrete to a certain extent. The current methods for measuring the chloride ion permeability of concrete mainly include the electric quantity method and the rapid chloride ...

Claims

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Application Information

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IPC IPC(8): G01N15/08
Inventor 方永浩顾亚敏温铨肖玉明康秋波戴玭
Owner HOHAI UNIV
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