Method for testing calcium ion diffusion coefficient of concrete
A technology of diffusion coefficient and calcium ion, applied in the field of concrete, to achieve the effect of simple measurement, simple calculation and clear principle
Inactive Publication Date: 2012-08-01
BEIJING UNIV OF TECH
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Problems solved by technology
The above methods can only test the chloride ion diffusion coefficient of concrete materials, so far there is no test method for testing other ion diffusion coefficients of concrete materials
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Embodiment 1
[0021] Sample: sample from Beijing University of Technology, see Table 1 for the mixing ratio. Among them, 0.45OPC is the reference concrete, the water-binder ratio is 0.45, 0.38OPC reduces the water consumption, and the water-binder ratio is 0.38, 0.45PFA is mixed with fly ash, 0.45GGBS is mixed with slag, and 0.45MS is mixed with silica fume.
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Abstract
The invention relates to a method for testing calcium ion diffusion coefficient of concrete, and the method comprises the following steps: cutting concrete into a sheet test sample, placing into a vacuum water holding device, dry-vacuuming, injecting a calcium hydroxide saturated solution into a vacuum chamber, and wet-vacuuming to form saturate concrete in the calcium hydroxide solution; applying voltage to the test sample, and measuring the calcium ion migration rate; and calculating the calcium ion diffusion coefficient according to Nernst-Plank equation. The calcium ion diffusion coefficient of concrete can be used for evaluating the permeability of concrete. The method provided by the invention has the following advantages: the method can be used for measuring the calcium ion diffusion coefficient of concrete, the method is simple, the data are accurate and reliable, and the method is suitable for both ordinary concrete and high performance concrete.
Description
technical field [0001] The invention relates to a method for testing the calcium ion diffusion coefficient of concrete, which belongs to the technical field of concrete. Background technique: [0002] Ion intrusion is one of the main factors leading to premature failure of concrete structures. For example, the corrosion of steel bars caused by chloride ions, the cracking of concrete caused by sulfate ions, and the decomposition of calcium silicate hydrate caused by magnesium ions. The main processes of ion intrusion into concrete materials include: diffusion, penetration, capillary absorption, migration and convection. Diffusion is one of the main processes. Therefore, the ion diffusion coefficient of concrete, as an important indicator of the durability of concrete materials, is of great significance for the study of the durability and life prediction of concrete structures. It is very important to determine scientific, reasonable, reliable and effective test methods. ...
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IPC IPC(8): G01N13/00
Inventor 杨进波李悦兰明章
Owner BEIJING UNIV OF TECH
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