Device and method for determination of permeability coefficient of chloride ions in concrete
A technique of permeability coefficient and measuring device, which is applied in the field of durability detection of concrete structures, and can solve problems such as the inability to measure the diffusion coefficient of chloride ions and low test efficiency
Inactive Publication Date: 2014-11-26
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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In the patent announcement, CN101699267, CN101718671A and CN102042949A have provided the device and method for measuring the permeability of concrete under the action of bending, compression and tension load by the direct current electric quantity method, but the direct current electric quantity method can only measure the electric flux, and the qualitative As a result, the chloride ion diffusion coefficient cannot be measured
Notice CN101482477A provides the method for measuring the chloride ion diffusion coefficient of concrete under tension by steady-state electromigration method. Although the announcement CN102564916A uses the unsteady-state electromigration test method to measure the chloride ion diffusion coefficient of concrete, its loading device can only provide pressure
The rapid test device and method for the chloride ion diffusion coefficient of concrete that can provide both pressure and tension have not been reported yet
In addition, the above loading device can only apply one type of load, and can only test one specimen at a time, so the test efficiency is low
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[0026] A device and method for measuring the permeability coefficient of chloride ions in concrete. The device is composed of a loading device and a testing device. The loading device includes a screw, a first pressing plate, a second pressing plate, a third pressing plate, a pad, a first screw cap, the first disc spring, the second disc spring, the gasket, and the second nut; there are two screw rods, and the same end of the two screw rods is fixed on the first pressure plate, along the top of the two screw rods. A second nut, a sleeve pad, a second disc spring, a second pressing plate, a first disc spring, a third pressing plate and a first nut are movable in series in sequence; the testing device includes a plastic case and is arranged on the Tilt stand inside the plastic box.
[0027] Put the three test blocks 11 between the first press plate 1 and the second press plate 2 in sequence, and there are stainless steel pads 12 between the test blocks. The blocks 12 are all bo...
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Abstract
The invention belongs to a technology for detecting concrete structure durability and relates to a device and a method for determination of a permeability coefficient of chloride ions in concrete. The method can realize a fast test of a diffusion coefficient of chloride ions in concrete under the action of continuous drawing and pressing loads. The device comprises a loading device and a test device. Through two screws and three pressing plates, the loading device applies a counter-force produced by a compressed spring to three test pieces thereby providing continuous and stable pressure or pull. Under the continuous and stable pressure or pull, the whole device is put into a specific rigid plastic case and an unstable-state electromigration test is carried out so that a diffusion coefficient of chloride ions is measured. The device can apply two types of loads, can test three test piece by an one step, and can realize fast determination of a diffusion coefficient of chloride ions under the action of drawing and pressing loads.
Description
technical field [0001] The invention belongs to the durability detection technology of concrete structures, and in particular relates to a rapid test method for the chloride ion diffusion coefficient of concrete under the action of continuous tension and compression loads. Background technique [0002] The intrusion of chloride ions leads to the corrosion of steel bars and the deterioration of the durability of reinforced concrete structures. A large number of engineering practices have shown that corrosion of steel bars in chloride environments such as ocean and deicing salts is the primary cause of premature failure of concrete structures, and corrosion of steel bars has caused huge economic losses. Concrete resistance to chloride ion penetration has become one of the important indicators for evaluating the durability of concrete structures. People have conducted many years of research on the test method of chloride ion permeability, and formulated relevant test procedure...
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IPC IPC(8): G01N13/04
Inventor 吴瑾宋永吉
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS