A method for evaluating chloride ion transport in concrete considering the chemical damage effect of sulfate
A technology of sulfate chemistry and damage effects, applied in surface/boundary effects, scientific instruments, design optimization/simulation, etc., can solve problems such as microcrack damage, and achieve high practical application and promotion value
Active Publication Date: 2021-10-15
QINGDAO TECHNOLOGICAL UNIVERSITY
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[0003] At present, there are many chloride ion transport models under the action of a single factor. However, the chloride ion transport in the marine environment is also affected by the sulfate transport and the internal temperature field of the concrete. The existing models do not consider the pores caused by the sulfate transport and reaction process. Combined Effect of Filling and Expansion Strain-Induced Microcrack Damage
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[0042] In order to understand the above-mentioned purpose, features and advantages of the present invention more clearly, the present invention will be further described below in conjunction with the accompanying drawings and embodiments. Many specific details are set forth in the following description to facilitate a full understanding of the present invention. However, the present invention can also be implemented in other ways than those described here. Therefore, the present invention is not limited to the specific embodiments disclosed below.
[0043] This example discloses a method for assessing chloride ion transport in concrete considering the sulfate chemical damage effect in a marine environment, such as Figure 4 shown, including the following steps:
[0044] Step 1, establish the chloride ion transport model inside the concrete under the action of sulfate;
[0045] Step 2, establishing the chloride ion transport model inside the concrete under the action of the temp...
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Abstract
The invention discloses an evaluation method for chloride ion transmission in concrete considering sulfate chemical damage effect in marine environment, and establishes a chloride ion transmission model inside concrete under the action of sulfate, and considers ion activity, temperature gradient, diffusion term and reaction in the model item; establish the chloride ion transport model inside the concrete under the action of temperature field, so as to more accurately predict the ion transport under the periodic temperature action of the marine environment; finally, establish the coupling effect of sulfate and temperature field from three aspects: pore structure, crack and binding effect Chloride transport model in concrete. Combining with the existing theoretical model of concrete degradation process, this scheme can more accurately predict the coupling transmission process of sulfate and chloride salt in deep sea environment, and provide a new method for durability design and durability evaluation of concrete in marine environment, with higher practicality Application and promotion value.
Description
technical field [0001] The invention relates to the field of concrete durability design and evaluation in marine environment, in particular to a chloride ion transmission evaluation method in concrete considering sulfate chemical damage effect in marine environment. Background technique [0002] Sulfate and chloride ion erosion in the marine environment is the most important part in the field of concrete durability research. The chloride in the marine environment reaches the surface of the steel bar through the concrete protective layer, resulting in the destruction of the passivation film on the surface of the steel bar and a series of electrochemical reactions. Cause steel bar corrosion and concrete expansion and cracking; the intrusion of sulfate ions will react with the hydrated aluminate inside the concrete to form expansion products such as gypsum and ettringite. These expansion products have low solubility and can fill the pores of concrete, causing concrete expansion ...
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IPC IPC(8): G01N13/00G06F30/20G06F119/08
CPCG01N13/00G01N2013/003G06F30/20G06F2119/08
Inventor 王鹏刚莫芮徐俊金祖权田砾熊传胜李哲隋晓萌李格格
Owner QINGDAO TECHNOLOGICAL UNIVERSITY