A test method for the natural corrosion characteristics of cement concrete in a salt-enriched environment

Abstract

The invention discloses a testing method of natural corrosion features of cement concrete under a salt enriched environment. The test is performed on a salt enriched area onsite, and the method comprises the following steps of: respectively burying different kinds of concrete test specimens in a totally exposed manner, a semi-buried and semi-exposed manner and a totally buried manner, tracking the change conditions of the salt enriched environment in real time through temperature and humidity detectors, and finally observing and testing the performance of the concrete test specimens at different salt corrosion stages to obtain the natural corrosion features of the concrete test specimens under the salt enriched environment. The testing method of natural corrosion features of cement concrete under salt enriched environment is used for analyzing the effect of corrosive medium changes, temperature, soil humidity and time on the cement concrete performance under natural conditions and truly evaluating the durability of the cement concrete under the salt enriched environment so as to provide technical guide on construction of road, bridge and tunnel engineering in salt enriched areas.

Description

technical field [0001] The invention relates to the field of research on the durability of highway bridges and tunnel engineering, in particular to a test method for the natural corrosion characteristics of cement concrete in a salt-enriched environment. Background technique [0002] There are saline soils and salt lakes all over the west of my country, and there are vast "salt-rich" areas. For example, the six western provinces (Shaanxi, Gansu, Ningxia, Qinghai, Mongolia, and New Zealand) have a total of about 25 million square kilometers of saline Soil, accounting for 69.0% of the country's saline soil area, in addition to the distribution of more than 1,000 salt lakes. With the development of traffic construction in western my country, the number of highway bridges and tunnel projects in salt-rich areas is increasing. For example, in Bayannur City, Inner Mongolia, more than 70% of the city’s roads are in salt-rich areas, and there are ten large and medium-sized bridges. Se...

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Problems solved by technology

[0006] 2) Sulfate corrosion

At the same time, the formation of gypsum consumes a certain amount of lime, resulting in a decrease in the concentration of liquid lime

In addition, sulfate attack will produce another product wollastonite, wollastonite will cause bubbling, swelling and bulging on the concrete surface, resulting in soft concrete and reduced strength

[0008] 3) Salt crystallization corrosion

At present, in terms of corrosion characteristics and damage and damage of cement concrete, my country has not yet matured technical specifications. Existing research on concrete corrosion tests has carried out indoor corrosion tests by preparing specific salt corrosion media, and the composition and distribution of salts in nature It is very complicated, and the regional climate varies greatly. It is difficult for indoor corrosion tests to truly simulate the changes of various factors such as the concentration of corrosion medium, temperature, humidity, sunshine, and dry-wet cycles in a salt-enriched environment, and these factors have a great influence on the concrete salt corrosion process It has a great impact, resulting in a large gap between the test results and the corrosion characteristics of concrete in the real environment. Sometimes the degree of salt corrosion is too high and deteriorates, resulting in a lot of waste of anti-corrosion costs. Sometimes the degree of salt corrosion is underestimated, which seriously affects the structure. It can be seen that the development of a test method that more realistically simulates the natural corrosion characteristics of cement concrete materials in a salt-enriched environment is beneficial for highway bridges and tunnels in a salt-enriched environment. Provide important references for material design and anti-corrosion scheme formulation to improve the durability and safety of cement concrete structures

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