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Construction method of multi-scale prediction model of chloride ion diffusion coefficient of prestressed concrete

A chloride ion diffusion and prediction model technology is applied in the construction of multi-scale prediction models of chloride ion diffusion coefficients of prestressed concrete, which can solve the problems of rationality and applicability inspection, large limitations, etc.

Active Publication Date: 2018-07-20
GUANGXI UNIV
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  • Application Information

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Problems solved by technology

The above studies on the factors affecting the diffusion of chloride ions are mainly based on experimental research, and the empirical formulas and fitting models established have relatively large limitations, and the rationality and applicability of them still need to be further tested.

Method used

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  • Construction method of multi-scale prediction model of chloride ion diffusion coefficient of prestressed concrete
  • Construction method of multi-scale prediction model of chloride ion diffusion coefficient of prestressed concrete
  • Construction method of multi-scale prediction model of chloride ion diffusion coefficient of prestressed concrete

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Experimental program
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Effect test

Embodiment 1

[0106] Example 1 Prediction of Chloride Diffusion Coefficients of Different Cement-Based Materials

[0107] 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.

[0108] The selection of relevant test raw materials is as follows:

[0109] Cement: P42.5 ordinary Portland cement, the chemical composition and mineral composition of cement clinker are shown in Table 1, and th...

Embodiment 2

[0158] Example 2 Designing concrete that meets the needs of different service life

[0159] 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.

[0160] 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 multi-scale prediction model of a chloride ion diffusion coefficient of prestressed concrete. The method is characterized by: regarding the concreteas a cement-based composite material composed of different-scale materials, establishing prediction models of chloride ion diffusion coefficients of the different-scale cement-based materials in sequence with gradual transition from small-scale hardened cement slurry to large-scale concrete, then considering influences which are of prestress inside the prestressed concrete and on chloride ion diffusion thereof, and finally, establishing the multi-scale prediction model of the chloride ion diffusion coefficient of the prestressed concrete. According to the method, influences of prestress levelson chloride ion diffusion are studied by starting from multi-scale structure formations of the cement-based materials, and the established multi-scale prediction model of the chloride ion diffusion coefficient of the prestressed concrete has very important significance for chloride ion penetration resistance study and durability design of the prestressed concrete.

Description

technical field [0001] The invention belongs to a method for predicting the chloride ion diffusion coefficient of prestressed concrete, in particular to a method for constructing a multi-scale prediction model for the chloride ion diffusion coefficient of prestressed concrete. Background technique [0002] Concrete is a heterogeneous, multi-scale material composed of cement, coarse aggregate and fine aggregate, and there are many pores and micro-cracks inside. These pores provide channels for harmful substances to enter the interior of the concrete. The intrusion of chloride ions into reinforced concrete can cause serious corrosion of steel bars, thereby affecting the safety of structures. The transmission of chloride ions in concrete is a complicated process, and its transmission process is affected by the scale structure of concrete itself. In addition, factors such as the age of concrete, temperature and internal stress level all have important effects on chloride ion tra...

Claims

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Application Information

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IPC IPC(8): G06F19/00G01N13/00
CPCG01N13/00G01N2013/003G16C20/10
Inventor 应敬伟李燕良欧阳楚才
Owner GUANGXI UNIV
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