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A method for testing the depth of carbonation of cement-based materials

A technology of cement-based materials and carbonation depth, applied in the direction of material electrochemical variables, etc., can solve the problems of unrepeatable, limited sampling times, and difficult to determine the color change limit of reagents, etc., to achieve the effect of convenient and feasible testing, free disassembly and installation

Active Publication Date: 2017-09-29
SHENZHEN UNIV
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  • Claims
  • Application Information

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Problems solved by technology

At present, this method has the following disadvantages: (1) the test piece needs to be destroyed, which is a one-time detection and cannot be repeated; (2) the unevenness of the split surface will make it difficult to determine the color change limit of the reagent; (3) the number of sampling is limited; (4) It is prone to artificial reading errors

Method used

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  • A method for testing the depth of carbonation of cement-based materials
  • A method for testing the depth of carbonation of cement-based materials
  • A method for testing the depth of carbonation of cement-based materials

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Embodiment 1

[0026] 1. Sample preparation: The 525-type composite Portland cement produced by Shenzhen Haixing Onoda Cement Co., Ltd. was prepared in a special mold (patent number: ZL 201120473976.2). The water-cement ratio of the cement paste test block was 0.25, 0.3, 0.4, 0.5, prepare 24 test pieces for each water-cement ratio, and the size of the test pieces is 160mm×40mm×40mm.

[0027] 2. Unloading end formwork: After the cement specimen is cured for 28 days, remove the 40mm×40mm electrode plates at both ends of the mold, and the remaining four 160mm×40mm high-insulation organic polymer plates are still sealed to the specimen.

[0028] 3. Carbonization: Put the mold after removing the electrode plate together with the test piece in the mold into the accelerated carbonization box, the carbon dioxide concentration in the box is 20%±3%, the relative humidity is 70%±5%, and the temperature is 20°C ±5°C.

[0029] 4. Test: During the carbonization process, the impedance spectrum test is car...

Embodiment 2

[0042] Adopted steps and method are as embodiment 1, difference is: 1) test object: cement mortar material, water-cement ratio 0.40, mortar ratio is respectively: 1: 2, 1: 3, 1: 4; 2) Test days: 0 days, 3 days, 7 days, 14 days, 36 days, 60 days, 90 days, 120 days.

[0043] Table 5 Parameters R of mortars with 1:2, 1:3, and 1:4 mortar ratios at different carbonization days ct1 the value of

[0044]

[0045] Table 6 The measured value of the carbonation depth of the mortar 60 days ago.

[0046]

[0047] Table 7 calculates the depth of carbonation at 90 days and 120 days

[0048]

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Abstract

The invention discloses a method for testing the carbonation depth of cement-based materials. The impedance spectrum test was carried out on the hardened cement material test block after the early carbonization, and the impedance spectrum was obtained. The electrochemical circuit model of the cement material is used to fit the impedance spectrum to obtain the electrochemical parameters, and then the actual carbonation depth of the cement material is tested. Establish a functional relationship between the electrochemical parameters and the actual carbonization depth, and then calculate the later carbonation depth of cement by calculating the electrochemical parameters. The invention carries out non-destructive, efficient and accurate test on the late stage carbonation depth of cement, which is more conducive to the research on the durability of concrete structures and the rapid detection of on-site carbonation depth.

Description

technical field [0001] The invention relates to a method for testing the carbonation depth of cement-based materials, in particular to a method for non-destructive detection of the carbonation depth of cement-based materials by electrochemical impedance spectroscopy. Background technique [0002] Concrete structures are often in a complex atmospheric environment during long-term use, and the carbon dioxide contained in the air often carbonizes with the cement paste in the concrete. Carbonation is essentially a neutralization reaction. During the carbonation process, the hydration product calcium hydroxide is continuously consumed, which causes the pH value of the carbonized part of the concrete to drop, which not only increases the shrinkage of the concrete, changes the internal stress of the concrete, causes concrete cracking, and also makes the concrete inside The steel bars are blunt and rusty. Therefore, the evaluation of the carbonation depth of cement-based materials ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N27/26
Inventor 董必钦邢锋邱启文向家琪黄灿杰袁伟鹏房国豪张健超徐伟伟王琰帅
Owner SHENZHEN UNIV
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