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Multiple environment time chloride corrosion concrete evaluation method

An environmental time, concrete technology, applied in the direction of strength characteristics, weather resistance/light resistance/corrosion resistance, material inspection products, etc., can solve the problem that the time cannot be similar, the indoor accelerated test results are linked, and the similar relationship between different environmental factors cannot be guaranteed. And other issues

Inactive Publication Date: 2008-05-21
ZHEJIANG UNIV
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Problems solved by technology

The mechanisms of various effects are mostly being explored in experimental research, and most of the obtained empirical formulas can not be used to derive similarity criteria for model tests
Secondly, due to the complexity of on-site environmental factors, the statistics of environmental factors are usually not fully collected, and it is impossible to ensure that the similar relationships between various environmental factors are the same when performing environmental simulations.
Third, traditional similarity cannot be achieved in terms of time. The basis for environmental acceleration is usually a statistical average, and the similarity coefficients cannot be completely equal to each factor.
Finally, the indoor accelerated test cannot achieve a complete accelerated simulation of the field test conditions, and the usual accelerated test is only an accelerated simulation of some parameters of the field test
[0007] Although the indoor accelerated test and field test have been used in the durability research of concrete structures for a long time, there is still a problem that the results of the indoor accelerated test cannot be connected with the detection results of the field test method. How to apply the test results of the indoor accelerated test to Field practice and conduct durability assessment and life prediction, which has become a key issue in the durability research of concrete structures

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  • Multiple environment time chloride corrosion concrete evaluation method
  • Multiple environment time chloride corrosion concrete evaluation method
  • Multiple environment time chloride corrosion concrete evaluation method

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Embodiment Construction

[0046] The similarity chlorine salt erosion concrete test method of multiple environment time of the present invention, according to the realization step of the present invention, the test adopts the method that field specimen test, third-party reference object sampling test and indoor accelerated test combine, the selection of third-party reference object It is the key to establish a similar relationship in the present invention, and it is also a feature different from other test methods.

[0047] Including the following steps:

[0048] (1) Determine the factors that affect the durability of concrete structures under chloride-salt environmental conditions: surface chloride ion concentration C s , Chloride ion diffusion coefficient D Cl , water-binder ratio w / b of concrete material, chloride ion threshold [Cl - ], age factor n, concrete cover thickness c;

[0049] (2) Select a third-party reference object that has served for many years with similar environmental conditions ...

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Abstract

The present invention relates to a evaluation method for the durability of chloride corrosion concrete, in particular to an evaluation method for similarity chloride corrosion concrete with multiple environment time. A third party reference object which is provided with the similar environment situation with the research object and serves for a plurality of years is selected. The boundary condition of each influence factor at the serving initial time of the research object, the third party reference object and the material of the research object are collected. The performance degradation relationship of the time of the third party reference object under spot environment and the corresponding concrete test piece in artificial climate simulation laboratory is compared and analyzed. The performance degradation time similar relationship of concrete structure durability in artificial simulation environment and spot environment is established. According to the boundary condition of the research object and the durability parameters of the corresponding concrete test piece obtained in acceleration condition, the performance degradation similar relationship of concrete structure durability in two environments is utilized, the durability evaluation and the life prediction are carried out to the research object on a spot condition.

Description

technical field [0001] The invention relates to a method for evaluating the durability of chloride-salt-eroded concrete, in particular to a method for evaluating the similarity of multiple environmental times for chloride-salt-eroded concrete. Background technique [0002] At present, the traditional test methods of concrete structure durability test at home and abroad mainly include on-site sampling test, on-site exposure test and indoor accelerated test. [0003] On-site sampling testing is the basic method for durability testing of concrete structures. Sampling and testing are usually carried out at the concrete structure site, and chemical analysis of the obtained samples is carried out indoors to obtain the erosion of chloride ions; the on-site exposure test can Some actual structures (or components) are specially set up in the station for sampling and testing, and the environmental conditions and stress states are very real. At the same time, concrete specimens are pla...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N3/00G01N17/00G01N33/38G06F19/00
Inventor 金伟良
Owner ZHEJIANG UNIV
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