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Construction method of multiscale prediction model for chloride ion diffusion coefficient of unsaturated concrete

A technology of chloride ion diffusion and prediction model, which is applied in the field of prediction of chloride ion diffusion coefficient of unsaturated concrete, which can solve the problems of inaccurate prediction of concrete chloride ion diffusion coefficient and uncertain value

Active Publication Date: 2018-07-27
GUANGXI UNIV
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  • Application Information

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Problems solved by technology

Foreign scholar Hall established a prediction model for the variation of concrete chloride ion diffusion coefficient with pore saturation in the wetting process, but the model involves uncertain values ​​of relevant empirical parameters, and its applicability needs to be further verified. Scholar Climent used relevant test data to regression The theoretical model of the change of the chloride ion diffusion coefficient of concrete with the pore water saturation when the water-cement ratio is 0.6 is obtained by fitting, but the model has relatively large limitations and cannot accurately predict the chloride ion diffusion coefficient of concrete with low water saturation

Method used

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  • Construction method of multiscale prediction model for chloride ion diffusion coefficient of unsaturated concrete
  • Construction method of multiscale prediction model for chloride ion diffusion coefficient of unsaturated concrete
  • Construction method of multiscale prediction model for chloride ion diffusion coefficient of unsaturated concrete

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Embodiment 1

[0096] Example 1 Prediction of Chloride Diffusion Coefficients of Different Cement-Based Materials

[0097] In order to verify the reliability of the multi-scale prediction model of the present invention, relevant raw materials are pre-selected, the relevant mix ratio design is given, and then the relevant chloride ion diffusion coefficients are calculated according to the prediction models for the chloride ion diffusion coefficients of cement materials of various scales established in steps 1 to 4 At the same time, cement-based materials were prepared according to the selected raw materials and mix ratio, and RCM rapid chloride ion diffusion test was carried out to obtain the test value of chloride ion diffusion coefficient, and compared with the model design value.

[0098] The selection of relevant test raw materials is as follows:

[0099] Cement: P42.5 ordinary Portland cement, the chemical composition and mineral composition of cement clinker are shown in Table 1, and th...

Embodiment 2

[0146] Example 2 Designing concrete that meets the needs of different service life

[0147] The predictive model of the invention can guide engineering practice and design concrete meeting the requirements of different service life. According to existing concrete structure life prediction theory, in conjunction with the prediction model of the present invention, set up the relation that concrete chloride ion diffusion coefficient changes with time, solve the chloride ion diffusion coefficient of concrete that satisfies different service life requirements, will obtain chloride ion The diffusion coefficient is substituted into the ordinary concrete multi-scale prediction model of the present invention to obtain a specific mix ratio design, which can provide reference for actual engineering design of concrete with different durability requirements.

[0148] According to Fick's second diffusion law, Yang Lufeng et al., considering the age attenuation coefficient, established the p...

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Abstract

The invention discloses a construction method of a multiscale prediction model for a chloride ion diffusion coefficient of unsaturated concrete. Concrete is regarded as a cement based composite material formed by different scales of materials, prediction models for chloride ion diffusion coefficients of different scales of cement based materials are constructed sequentially by starting from small-scale hard cement paste to large-scale concrete gradually, and finally, by considering the influence of saturation degree of internal water of the concrete on chloride ion diffusion, the multiscale prediction model for the chloride ion diffusion coefficient of the unsaturated concrete is constructed finally. By considering the influence of the saturation degree of internal water of the concrete onchloride ion diffusion, the chloride ion diffusion coefficient of the unsaturated concrete can be predicted more scientifically, more reasonably and more accurately with the method, and the method has great significance in chloride penetration resistance research and durability design of the concrete under unsaturated conditions.

Description

technical field [0001] The invention belongs to a method for predicting the chloride ion diffusion coefficient of unsaturated concrete, in particular to a method for constructing a multi-scale prediction model for the chloride ion diffusion coefficient of unsaturated concrete. Background technique [0002] Concrete is a heterogeneous material composed of cement, coarse aggregate and fine aggregate, and there are many pores and micro-cracks inside, which provide channels for harmful substances to enter the interior of the concrete. Chloride ions intruding into reinforced concrete through these channels can cause severe corrosion of steel bars, thereby affecting structural safety. [0003] The transmission of chloride ions in concrete is a complex process. Factors such as the saturation degree of concrete, water pressure and external electric field all have important effects on the transmission of chloride ions. According to the power source of transmission, the mechanism of ...

Claims

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Application Information

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IPC IPC(8): G01N13/00
CPCG01N13/00
Inventor 应敬伟沈小俊欧阳楚才
Owner GUANGXI UNIV
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