Loading device for testing concrete chloride ion permeability by coulometry and testing method thereof

A technology of chloride ion penetration and loading device, which is applied in the field of loading device for concrete chloride ion permeability electric method test, can solve the problems that are not considered and cannot realize the bending load of the tested piece, and achieve stable load, stable test results, and easy operation convenient effect

Inactive Publication Date: 2010-04-28
HOHAI UNIV
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AI Technical Summary

Problems solved by technology

The standard (ASTM C1202) adopted by many countries for evaluating the resistance of concrete to chloride ion penetration (ASTM C1202) formulated by the American Society for Standards and Testing of Materials is to apply a DC voltage of 60V to both ends of a Φ95×50mm concrete sample, and pass the test for 6h To evaluate the permeability of concrete, the device and method used did not take into account the amount of electricity flowing through it, and it was impossible to apply bending loads to the test piece at the same time.
Therefore, due to the constraints of conventional test equipment, the test method for the chloride ion permeability of concrete under bending load conditions is still blank.

Method used

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  • Loading device for testing concrete chloride ion permeability by coulometry and testing method thereof
  • Loading device for testing concrete chloride ion permeability by coulometry and testing method thereof
  • Loading device for testing concrete chloride ion permeability by coulometry and testing method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0047] Loading device and loading method for galometric test of chloride ion permeability of concrete under bending load

[0048] Concrete chloride ion permeability electric method test loading device, which is composed of a steel base plate 1 with two parallel supports 12, a screw rod 2, a lower pressing steel plate 3 with steel pressure heads 13 at both ends, a force measuring device (including a pressure sensor and a display instrument) 4, upper pressure plate 5, upper pressure plate positioning bolt cap 6, jack 7, top plate 8 and top plate positioning bolt cap 9;

[0049]The steel bottom plate 1 is 400mm long, 300mm wide, and 30mm thick. The height of the two parallel supports on the top is 70mm, and the width is 30mm. The top of the support is semicircular, and the distance between the centers of the two supports is 100mm. M24 screw holes with a spacing of 200mm; the dimensions of the lower pressure plate 3, the upper pressure plate 5 and the top plate 8 are all 360mm in ...

Embodiment 2

[0053] Coulometry test method for chloride ion permeability of hydraulic concrete under complex compressive load conditions

[0054] Use P·II 42.5 grade cement, river sand with a fineness modulus of 2.4, limestone artificial gravel with a maximum particle size of 20mm and tap water to prepare concrete according to the mix ratio shown in the table, and form a prism concrete of 100mm×70mm×400mm Test pieces, 21 test pieces for each ratio. After the specimens were cured in water in the standard concrete curing room for 28 days, three of each proportioned specimens were selected to measure the four-point flexural strength, which was used as a reference for the loading size of the remaining specimens in the chloride ion permeability test.

[0055] Table 2 Concrete mix ratio and flexural strength of specimens

[0056]

[0057] Each ratio is divided into 6 groups, according to the bending load levels of 0, 20%, 40%, 50%, 60%, and 70% six loading methods are measured, and 3 test pi...

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Abstract

The invention provides a loading device for testing concrete chloride ion permeability by coulometry. A steel bottom plate is provided with two screw holes; two parallel screws are inserted into the screw holes; an underdraught steel plate, an overdraught steel plate and a top plate which are parallel to the steel bottom plate are sleeved on the screws sequentially; a jack is arranged between the top plate and the overdraught steel plate; a dynamometer is arranged between the overdraught steel plate and the underdraught steel plate; the steel bottom plate is provided with a convex steel support upwards; the underdraught steel plate is provided with a convex steel pressing head downwards; a overdraught steel plate positioning bolt cap is sleeved on one screw on the upper part of the overdraught steel plate; and a top plate positioning bolt cap is sleeved on the other screw on the upper part of the top plate. The invention also provides a method for testing the concrete chloride ion permeability by the coulometry by utilizing the loading device. The loading device solves problems that the conventional concrete chloride ion permeability testing device cannot apply bending loads on tested pieces, cannot simulate the actual load-up condition of in-service concrete members, and cannot measure the concrete chloride ion penetrability under the condition of the bending loads.

Description

technical field [0001] The invention relates to a loading device for testing the chloride ion permeability of concrete by the electrical method, in particular to a loading device for performing the chloride ion permeability electrical method test on the concrete under a bending load condition, and the invention also relates to a test using the loading device method. Background technique [0002] Chloride ion permeability is not only an important index to characterize the permeability of concrete, but also an indicator for the corrosion resistance of steel bars in reinforced concrete in environments with high chloride ion content (such as seaport terminals, underground engineering, hydraulic structures and reinforced concrete poles in coastal areas). important sign. The current methods for measuring the chloride ion permeability of concrete mainly include the electric quantity method and the rapid chloride ion migration method, but the test pieces in the two methods do not i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N15/08G01N3/20
Inventor 方永浩葛兆祥肖玉明李夕强顾冲时贾丽丽陈逸群
Owner HOHAI UNIV
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