Detection method for determining chloride ion content in sea sand

Abstract

The invention relates to a detection method for determining the chloride ion content in sea sand. The method comprises the following steps: the sea sand dried to constant weight is added into boiled deionized water and fully stirred, stands and then is filtered to obtain washed sea sand and washing filtrate; the washed sea sand is ground into sea sand powder, and the sea sand powder is added intothe deionized water, fully stirred and filtered to obtain powder filtrate; half of the washing filtrate and half of the powder filtrate are measured, mixed and stirred to prepare mixed filtrate; the chloride ion contents of the washing filtrate, the powder filtrate and the mixed filtrate are determined with a silver nitrate titration method respectively, detection results are analyzed and corrected, and the chloride ion content in the sea sand is obtained. According to the method, the release of chloride ions from the tight wrapping films and cracks on the surface of the sea sand is promoted to a large extent, and the authenticity of the detection result of the chloride ion content in the sea sand is guaranteed scientifically. The chloride ions can be rapidly dissolved, the detection timeis greatly shortened, and the accuracy of the detection result of the chloride ion content is remarkably improved.

Description

technical field [0001] The invention belongs to the technical field of chloride ion content detection, and in particular relates to a detection method for determining the chloride ion content in sea sand. Background technique [0002] At present, my country's sand and gravel resources are gradually decreasing or even exhausted. Sea sand is a better substitute for river sand, with good grain shape, low cost, low mud content and abundant reserves. Rational use of sea sand is of great significance to infrastructure construction and sustainable development of society. However, there are chlorine salt impurities in sea sand, which can accelerate the corrosion of steel bars and greatly reduce the durability of concrete structures. Although the country allows the use of sea sand that has been purified and meets the standard requirements, actual engineering investigations have found that the phenomenon of concrete structure damage caused by chloride ions is still common. This is m...

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Problems solved by technology

[0003] (1) Improper treatment of the sea sand to be tested: the existing detection methods for chloride ion content are often not thorough enough to treat sea sand, which is mainly due to the fact that the chloride ions in the cracks and pores of the sea sand are tightly wrapped by organic matter in the ocean. However, the chlorine ions remaining in the cracks and pores of the sea sand cannot be released by soaking or shaking at room temperature, so that the measured value of the chloride ion content in the sea sand is significantly lower than the actual value; this type of sea sand The application of sand in construction engineering will lead to the occurrence of problems that endanger the structural safety of buildings

[0004] (2) The preparation method of the filtrate to be tested is not targeted: whether the sea sand is purified by fresh water or ground and filtered, the filtrate to be tested with chloride ions can be obtained, but the sea sand has a large particle size and chloride ion concentration before and after grinding. difference; if the same method is used to prepare the test solution, it will easily lead to incomplete dissolution of chloride ions, which will eventually affect the detection results of chloride ion content

[0005] (3) The test result lacks a reference and is difficult to correct: when the existing chloride ion content is detected, the same solution is often detected once or more times, even if it is detected multiple times, the arithmetic mean value is simply calculated, and the detection results are often different. Cannot refer to and compare with each other, making it difficult to correct detection errors

[0006] (4) The common chlorine ion detection method takes a long time, and the long-term experiment can easily make the operator feel fatigued, thus increasing the probability of experimental errors

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