Detection method for determining chloride ion content in sea sand

A technology of chloride ion content and detection method, which is applied in the detection field of determining the chloride ion content in sea sand, can solve the problems of endangering the structural safety of buildings, difficulty in correcting detection errors, and increasing experimental errors, so as to shorten the detection time and reduce the detection time. Error, the effect of improving accuracy

Active Publication Date: 2019-11-15
FUZHOU UNIV
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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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  • Detection method for determining chloride ion content in sea sand

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specific Embodiment approach

[0035] A kind of detection method of determining chloride ion content in the sea sand in the embodiment, carries out as follows:

[0036] Step 1: preparing the washing filtrate;

[0037] Take the sea sand sample to be tested and dry it to constant weight, then weigh the mass as G 0 The dried sea sand sample to be tested is then added to boiled deionized water and stirred for 3-6 minutes, then left to stand for 10-15 minutes, and then filtered to obtain washed sea sand and water-washed filtrate; during the stirring process, the deionized water is maintained by heating The temperature is not lower than 90°C; the mass ratio of the dried sea sand sample to be tested for mixing and stirring to the deionized water is 1:1.5-2.5;

[0038] Step 2: preparing powder filtrate;

[0039] After drying the washed sea sand obtained in step 1 until the surface is dry, grind the washed sea sand into sea sand powder with a fineness of not less than 100 mesh, then add the sea sand powder into de...

Embodiment 1

[0063] Pour 400g of the sea sand sample to be tested that has been dried to constant weight into 800ml of boiled deionized water, and use a magnetic stirrer with a rotation speed of 1000r / min to fully stir for 5min. During the stirring process, keep heating to keep the temperature of the deionized water at 92°C , the stirring was completed, and filtered after standing for 12 minutes to obtain washed sea sand and 580ml washed filtrate. After drying the washed sea sand in a drying oven until the surface is dry, use a ball mill to grind the washed sea sand into sea sand powder with a fineness of 100 mesh, pour the sea sand powder into 800ml of deionized water and stir for 10 minutes, then filter to obtain 520ml powder filtrate. After placing the water-washed filtrate and powder filtrate in a 30°C incubator for 20 minutes, measure 290ml of water-washed filtrate and 260ml of powder filtrate and mix and stir to obtain 550ml of mixed filtrate; place the mixed filtrate, water-washed f...

example 1

[0066] Calculate the chloride ion content in sea sand using the test method in GB / T 14684-2011 "Sand for Construction". Take 1000g of the sea sand sample from the same source as in the above application example 1, place it in a drying oven and dry it to constant weight, and then cool it for later use; weigh 500g of dry sand and pour it into a ground-mouth bottle, and inject 500mL of distilled water into the ground-mouth bottle, Cover the stopper, shake it once and let it stand for 2 hours, then shake it once every 5 minutes, and shake it 3 times in total; after filtering the solution, carry out two silver nitrate titration methods to measure the chloride ion content, and calculate the arithmetic mean of the two test results to get the chloride ion The content is 0.135%.

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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...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N31/16G01N1/28G01N1/34G01N1/38
CPCG01N31/16G01N1/28G01N1/34G01N1/38G01N2001/386G01N2001/4088G01N1/4077G01N33/24
Inventor 杨政险洪荣灿卢林蔡水坤邓长泰林晓晖林修清
Owner FUZHOU UNIV
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