Method for testing carbonation depth of cement-base material
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A cement-based material, carbonization depth technology, applied in the direction of material electrochemical variables, etc., can solve the problems of non-repeatability, limited sampling times, reading errors, etc., to achieve the effect of convenient and feasible testing, easy disassembly and installation
Active Publication Date: 2014-04-09
SHENZHEN UNIV
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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
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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. End-unloading template: 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, conduct impedance spectrum tests o...
Embodiment 2
[0043] The steps and methods adopted are as in Example 1, the difference is: 1) Test object: cement mortar material, water-cement ratio 0.40, mortar-sand ratio: 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.
[0044] Table 51: Parameter R of mortar with mortar ratio of 2, 1:3, 1:4 at different carbonization days ct1 the value of
[0045]
[0046] Table 6 The measured value of the carbonation depth of the mortar 60 days ago.
[0047]
[0048] Table 7 Calculation of carbonation depth at 90 days and 120 days
[0049]
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Abstract
The invention discloses a method for testing carbonation depth of a cement-base material. The method comprises the following steps of carrying out the impedance spectroscopy for a hardened cement material test block being carbonated in the preliminary stage to obtain an impedance spectra; fitting the impedance spectra by utilizing an electrochemical circuit model of the cement material to obtain an electrochemical parameter, and then testing the real carbonation depth of the cement material; establishing a functional relation between the electrochemical parameter and the real carbonation depth, and calculating the carbonation depth of the cement in the later period by calculating the electrochemical parameter. By adopting the method, the later-period carbonation depth of the cement can be nondestructively and accurately tested with high efficiency, and the study on the duration of the concrete structure and the rapid detection of the on-site carbonation depth can be favored.
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 ...
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