Method for measuring concrete chloride penetration coefficient through electrodeless electrical measuring method

A chloride ion penetration, concrete technology, applied in permeability/surface area analysis, measurement device, suspension and porous material analysis, etc., can solve the problem of large test error, avoid changes, eliminate measurement errors, and improve test accuracy and the effect of precision

Inactive Publication Date: 2014-09-24
WUHAN INSTITUTE OF TECHNOLOGY
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Problems solved by technology

[0009] The purpose of the present invention is to solve and eliminate the large test error caused by factors such as the polarization reaction of the current electrode method for testing chloride ion permeability, the contact resistance between the electrode and the cement substrate, and the contact cracking caused by cement hydration shrinkage. , providing a method for measuring the chloride ion permeability coefficient of concrete by electroless electrometry

Method used

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  • Method for measuring concrete chloride penetration coefficient through electrodeless electrical measuring method

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Experimental program
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Effect test

Embodiment 1

[0032] Use P.O42.5 cement, 0.6-5mm sand, 5-10mm stone and water to prepare concrete samples with a mix ratio of cement: water: sand: stone = 0.4:1:1.25:2.49, and cast them in a resistivity ring mold. After standard maintenance for 28 days, cut the cured annular sample into 51.2mm thick slices with a cutting machine, process the cut sample with 10% sodium chloride solution vacuum saturated salt, test the solution and ( solution+slice) series model resistance, calculated according to the series model formula (1) and resistivity formula (2), the resistivity of the concrete sample at the age of 28 days is 34.89 ohm.m, according to the Nernst-Einstein equation (3) Chloride ion permeability coefficient is 0.4378×10 -7 cm 2 / s.

Embodiment 2

[0034] Use P.O42.5 cement and water to prepare a cement slurry sample with a water-cement ratio of 0.30, pour it into a resistivity ring mold, and cut the cured sample into 47.9mm thick slices with a cutting machine after 28 days of standard curing , use 10% sodium chloride solution to treat the cut sample with vacuum saturated salt, test the resistance of the solution and the (solution + slice) series model with the electrodeless resistivity method, and calculate the water-cement ratio according to the series model formula and the resistivity formula The resistivity of the 0.30 cement slurry sample at the age of 28 days is 13.66 ohm.m, and the chloride ion permeability coefficient is 1.1187×10 according to the Nernst-Einstein equation -7 cm 2 / s.

Embodiment 3

[0036] Test the chloride ion permeability coefficient of three samples. Use P.O42.5 cement and water to prepare a cement slurry sample with a water-cement ratio of 0.40, pour it into a resistivity ring mold, and cut the cured sample into 47.5mm thick slices with a cutting machine after 28 days of standard curing , use 10% sodium chloride solution to treat the cut sample with vacuum saturated salt, test the resistance of the solution and the (solution + slice) series model with the electrodeless resistivity method, and calculate the water-cement ratio according to the series model formula and the resistivity formula The resistivity of the 0.40 cement slurry sample at the age of 28 days is 9.11 ohm.m, and the chloride ion permeability coefficient is 1.3776×10 according to the Nernst-Einstein equation -7 cm 2 / s.

[0037] The measurement results are compared with the actual results, and the errors are shown in Table 1.

[0038] Table 1

[0039] Example 1

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Abstract

The invention discloses a method for measuring a concrete chloride penetration coefficient through an electrodeless electrical measuring method. The method comprises the steps that hardened concrete with any age is cut into concrete slices; salt saturation treatment is carried out on the vacuum the concrete slices through a sodium chloride solution; the resistivity of the sodium chloride solution and the resistivity of a sodium chloride solution and concrete slice series connection model are respectively tested through an electrodeless resistivity meter, and then the resistivity of the concrete slices is calculated on the basis of a resistivity formula; on the basis of the Nernst-Einstein equation, the penetration coefficient of chloride ions in the concrete slices is calculated. According to the method, the penetration coefficient of the chloride ions in the hardened concrete slices with any age is determined, the problem that the concrete chloride penetration coefficient cannot be accurately measured at present is solved, and the more accurate basis is provided for durability estimation and service life prediction of reinforced concrete.

Description

technical field [0001] The invention belongs to the technical field of concrete performance detection, and relates to a method for measuring the chloride ion permeability coefficient of concrete by an electrodeless electric measurement method. Background technique [0002] In order to evaluate the durability of concrete, existing test methods include natural penetration method ASTM C1556 (2004), electric quantity method ASTM C1202-94, permeability coefficient method (researcher Luping Tang, K.Stanisha), NEL method (Tsinghua University Lu Xinying )Wait. [0003] Chloride ion natural diffusion method (ASTM C1556), is to immerse concrete in sodium chloride solution, and through the experimental steps of segmental cutting concrete grinding, leaching, electrochemical titration, etc., to establish the relationship between chloride ion concentration and diffusion distance, using Fick's second theorem, calculating the diffusion coefficient. This method is similar to the actual sit...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N15/08
Inventor 肖莲珍魏小胜王胜年李宗津
Owner WUHAN INSTITUTE OF TECHNOLOGY
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