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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