Electrochemical judgment method of fire-damaged concrete reinforcement damage

A technology of concrete reinforcement and determination method, applied in the direction of electrochemical variables of materials, etc., can solve problems such as concrete neutralization

Inactive Publication Date: 2017-08-18
TAIYUAN UNIV OF TECH
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Problems solved by technology

However, when the concrete structure is subjected to high-temperature burning (fire), a series of dehydration phase changes will occur in the cement hydration products, especially Ca(OH) 2 At 450°C-500°C, it will lose water to form CaO, which will lead to the neutralization of concrete

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  • Electrochemical judgment method of fire-damaged concrete reinforcement damage

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Embodiment 1

[0051] (1) Specimen preparation: preparation of concrete slabs

[0052] Raw materials: P.O 42.5 cement, gravel 5-25mm, medium sand, round steel with a diameter of 10mm;

[0053] Concrete mix ratio: m (cement): m (sand): m (stone): m (water) = 385: 610: 1220: 220; (this is the mass ratio of the four raw materials)

[0054] Specimen preparation: pouring 30mm×30mm×10mm reinforced concrete slabs, the thickness of the concrete cover is 25mm; (the thickness of the concrete cover refers to the distance between the steel bar and the concrete surface). And all wires are pre-led out for testing; after 28 days of standard curing, the specimens are placed in an indoor natural environment for standby;

[0055] Five concrete slabs of the same size are poured, and the steel bars are placed in two types: well shape and cross shape, and the wires are pre-leaded for testing. %) after 28 days, put it in indoor natural environment for later use.

[0056] Denote as sample 1, sample 2, sample 3,...

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Abstract

The invention discloses an electrochemical judgment method of fire-damaged concrete reinforcement damage. The method comprises the steps as follows: (1) preparation of a test piece; (2) simulation of a fire damage test; (3) electrochemical detection and data acquisition; (4) data analysis and damage evaluation. Test study is conducted on fire-damaged concrete reinforcement damage according to the basic principle of electrochemical detection of reinforcement corrosion on the basis of three electrochemical elements, an electrochemical criterion of the fire-damaged concrete reinforcement damage is established, and then, diagnostic assessment is performed on actual fire-damaged concrete structures by use of the criterion and an auxiliary analysis model.

Description

technical field [0001] The invention relates to an electrochemical judging method for the damage of fire concrete reinforcement, which belongs to the technical field of concrete detection. Background technique [0002] With the rapid development of my country's social economy and modernization, various concrete structures are emerging one after another, and the density of houses is increasing. In addition, the wide application of a large number of flammable new materials, and the widespread use of gas and electrical appliances have caused fires in concrete structures. The probability of the fire is greatly increased, and the fire loss is increasing day by day. Usually, due to the hydration of cement to generate a large amount of calcium hydroxide in concrete, the internal pH of concrete is generally as high as 12.5 to 13.5. In this high-alkalinity environment, the steel bars wrapped in concrete will quickly form a very dense layer of about 2×10 due to the initial electrochem...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N27/26
CPCG01N27/26
Inventor 杜红秀陈尧丁明冬
Owner TAIYUAN UNIV OF TECH
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