Multiple environment time chloride corrosion concrete evaluation method

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...

AI Technical Summary

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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