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Method for testing pH value of a concrete pore fluid

A pore liquid and concrete technology, applied in the field of pH testing, can solve the problems of a large number of test blocks, high operation cost of extrusion method, complicated operation of leaching method, etc., and achieve the effect of low cost and simple operation.

Inactive Publication Date: 2019-06-11
HARBIN ENG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The current test methods include extrusion method and leaching method. The extrusion method has high operating costs and requires a large number of test pieces. The leaching method is complicated to operate and needs to establish a fitting curve to calculate the pH of the pore fluid. The two methods are used in actual operation. have more disadvantages

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  • Method for testing pH value of a concrete pore fluid
  • Method for testing pH value of a concrete pore fluid
  • Method for testing pH value of a concrete pore fluid

Examples

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Embodiment Construction

[0021] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0022] A method for testing the pH value of concrete pore liquid, the method uses a cylindrical concrete test block, drills holes in the test block and injects distilled water, and tests the pH value of the concrete pore liquid by ion precipitation. The method is divided into two stages: specimen preparation and testing. The first stage includes concrete test block cutting, cutting section drilling, plexiglass plate covering, distilled water filling, orifice sealing treatment, specimen storage, etc.; the second stage is pH value test. Cut the concrete to be tested according to the requirements, and drill holes in the test block, seal the perforated plexiglass on the orifice of the test piece, add distilled water and seal it with a rubber stopper. Store the processed test block in an environmental test chamber with 100% humidity and 2...

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Abstract

The invention provides a method for testing a pH value of a concrete pore fluid. The method comprises the steps of preparing a test piece and carrying out a test. The step of preparing the test piececomprises the sub-steps of cutting to-be-tested concrete into the test piece; drilling a hole in the test piece; sealing organic glass with a hole on the hole of the test piece; adding distilled waterinto the hole of the test piece and carrying out sealing; and storing the treated test piece in a test box in an environment with the humidity of 100% and the temperature of 22-25 DEG C. The step ofcarrying out the test comprises the sub-steps of putting a glass pH microelectrode and an Ag-AgCl micro-reference electrode into the hole of the test piece to test the pH value of the pore fluid. Themethod for testing the pH value of the concrete pore fluid is effective and accurate, simple to operate and low in cost.

Description

technical field [0001] The invention relates to a method for testing pH, in particular to a method for testing the pH of concrete pore fluid. Background technique [0002] As a common building material, reinforced concrete is widely used in the construction of various infrastructures. During the service process of reinforced concrete structures, the corrosion of steel bars is an important reason for the reduction of their durability. Due to the high alkaline environment formed by the concrete pore fluid, a passivation film will be formed on the surface of the steel bars, so it has good durability. In chloride salt or marine environments, chloride ions will destroy the passivation film and cause steel reinforcement corrosion, and the pH value of concrete will affect the chloride ion concentration threshold that causes steel reinforcement corrosion. [0003] Therefore, the pH value of concrete pore fluid is of great significance to the durability and life prediction of concre...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N27/26
Inventor 刘延波李刚仝玉栋刘宇左宸嘉
Owner HARBIN ENG UNIV
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