Method for rapidly determining chloride ion permeation resistance of concrete

A chloride ion penetration and rapid measurement technology, applied in the field of concrete, can solve the problems of deviation of test results, short test time, excessive temperature rise of test blocks, etc., and achieve the effect of reducing test error and short test time

Inactive Publication Date: 2013-06-26
SHIJIAZHUANG TIEDAO UNIV
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Problems solved by technology

Among them, the method (1) applies 60V direct current to the concrete test block with a thickness of 5 cm, measures the electric flux for 6 hours, and uses the electric flux value to characterize the chloride ion intrusion resistance of the concrete. High, affecting the test results; method (2) Immerse the 5cm thick concrete test block in the sodium chloride solution, apply 10V~60V direct current on the electrodes at both ends of the test block, measure the depth of chloride ion intrusion into the concrete after a certain period of time, and calculate Obtaining the chloride ion diffusion coefficient has the advantages of wide applicability and reasonable method, but the disadvantage is that the test process is complicated and the test time is long; method (3) fasten the tester to the concrete surface, and the tester includes two separated inner and outer solution chambers , the solution chambers are respecti

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  • Method for rapidly determining chloride ion permeation resistance of concrete
  • Method for rapidly determining chloride ion permeation resistance of concrete

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Embodiment 1

[0021] Sample: Sample from Shijiazhuang Railway University, see Table 2 for mixing ratio, and the water-binder ratio is 0.4. The C0 specimen is ordinary portland cement concrete; 20% of the cement is replaced by fly ash in the FA specimen; 25% of the cement is replaced by slag in the GS specimen; 5% of the cement is replaced by silica fume in the SF specimen cement.

[0022] Table 2 Mixing ratio of concrete samples

[0023]

[0024] (1) Form a cube test block with a side length of 10cm using an ordinary triple mold. After standard curing to 28 days of age, use a rock cutter to cut a test block with a thickness of 5cm, and use ordinary commercially available concrete vacuum water saturation equipment for vacuum saturation The specific steps are as follows: first put the cut test block into the water-saturated equipment, dry pump, make the absolute pressure of the vacuum chamber less than 2000 Pa within 10 minutes and keep it for 3 hours, inject deionized water until the tes...

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Abstract

The invention relates to a method for rapidly determining the chloride ion permeation resistance of concrete. The method comprises the following steps: slicing concrete, putting the obtained sliced concrete into a vacuum water-saturated device, pumping to a certain vacuum degree, injecting deionized water to the obtained vacuum chamber, and maintaining the vacuum degree for a certain period of time to make apertures in the concrete full of water; and carrying out alternating current impedance test of a test piece to obtain a characteristic conductivity, and calculating via a conversion formula to obtain an equivalent dielectric flux in order to evaluate the chloride ion permeation resistance of concrete. The method has the advantages of determination of the dielectric flux of concrete within a very short period of time, simplicity, reliable data, no less, and realization of multi-time test of the same test piece.

Description

technical field [0001] The invention relates to a method for quickly measuring the chloride ion permeability resistance of concrete, which belongs to the technical field of concrete. Background technique [0002] The intrusion of chloride ions is an important factor leading to steel corrosion and loss of durability in reinforced concrete structures. Existing methods for evaluating concrete’s resistance to chloride ion intrusion include: (1) electric flux method (namely American standard ASTM C1202, which is also a Chinese standard), (2) unsteady-state chloride ion migration method (Nordic standard NT Build492, The same is the Chinese standard), (3) steady-state chloride ion migration method (British "PERMIT" method), (4) conductivity method (NEL method). Among them, method (1) applies 60V direct current to the concrete test block with a thickness of 5 cm, measures the electric flux for 6 hours, and uses the electric flux value to characterize the chloride ion intrusion resi...

Claims

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Application Information

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IPC IPC(8): G01N15/08
Inventor 吴立朋
Owner SHIJIAZHUANG TIEDAO UNIV
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