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Method for detecting content of chlorine ions in sea sand

A technology of chloride ion content and detection method, which is applied in the field of detection of chloride ion content in sea sand, can solve the problem of low measured value, achieve fast operation, meet the requirements of on-site testing, and promote full dissolution

Active Publication Date: 2015-05-20
中国国检测试控股集团海南有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Through research, it is found that the current detection method of chloride ions in sea sand has defects, and its measured value is lower than the true value of chloride ions in sea sand, and excessive chloride ions in sea sand are slowly released in buildings, which leads to the above-mentioned problems in reinforced concrete

Method used

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  • Method for detecting content of chlorine ions in sea sand
  • Method for detecting content of chlorine ions in sea sand
  • Method for detecting content of chlorine ions in sea sand

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Sieve the sea sand in the natural wet state, take m(1+z) gram weight of the sieve as the sea sand sample, m is the quality of the dry sea sand sample, z is the moisture content of the sea sand sample in the natural wet state .

[0024] Add deionized water to the above-mentioned sea sand sample, heat and control the temperature of the sea sand sample to 40-95°C, and then let it stand for more than 24 hours;

[0025] Filter, immerse the chloride ion selective electrode and the saturated calomel electrode in the filtrate, and the above two electrodes are connected with the potentiometer;

[0026] Read the voltage in millivolts, the electromotive force of the battery and the concentration of chloride ions in the solution to be tested conform to the Nernst law formula (1), and the molar concentration of chloride ions can be obtained according to the regression analysis formula;

[0027] E = E 0 - ...

example 1-5

[0039] According to the method described in the above-mentioned Example 1, the temperature of the sea sand samples was controlled at 25°C, 40°C, 60°C, 80°C and 95°C to detect the chloride ion concentration in the sea sand, and the obtained test results are shown in Table 1.

Embodiment 2

[0046] Sieve the sea sand in the natural wet state, take m(1+z) gram weight of the sieve as the sea sand sample, m is the quality of the dry sea sand sample, z is the moisture content of the sea sand sample in the natural wet state .

[0047] Add deionized water to the above-mentioned sea sand sample, then perform ultrasonic oscillation, and then let it stand for more than 24 hours;

[0048] Filter, immerse the chloride ion selective electrode and the saturated calomel electrode in the filtrate, and the above two electrodes are connected with the potentiometer;

[0049] Read the voltage in millivolts, the electromotive force of the battery and the concentration of chloride ions in the solution to be tested conform to the Nernst law formula (1), and the molar concentration of chloride ions can be obtained according to the regression analysis formula;

[0050] E = E 0 - RT nF ...

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Abstract

The invention relates to a method for detecting the content of chlorine ions in sea sand. The method comprises the steps of sieving sea sand to obtain undersized sand as a sea sand sample; adding deionized water into the sea sand sample, heating and / or carrying out ultrasonic vibration and standing; filtering, immersing a chloride ion selective electrode and a saturated calomel electrode into filtrate and connecting the two electrodes with a potentiometer; reading the voltage millivolt value, enabling the electrodynamic potential of a battery and the concentration of chloride ions in a solution to be tested to conform to the Nernst distribution law and acquiring the molar concentration of the chlorine ions according to the regression analysis formula; and converting the molar concentration of the chlorine ions into the weight percentage of the sea sand, thereby acquiring the measured value of the content of the chlorine ions. According to the method, the ion measurement value can be in accordance with the true value of the content of the chlorine ions in sea sand, and reliable reference data is provided for building sand.

Description

technical field [0001] The invention relates to a detection method, in particular to a detection method for chloride ion content in sea sand. Background technique [0002] With the development of urbanization, the freshwater placer is depleted day by day, and the amount of new river sand can no longer meet the demand for construction sand. However, my country's coastal areas are rich in sea sand resources, which can well alleviate the tension of construction sand. Compared with river sand, sea sand has the characteristics of low mud content and uniform fineness modulus, but sea sand contains high concentration of chloride salts, and the chloride ions in chloride salts have a destructive effect on concrete, thereby reducing the durability of buildings and security. my country's current GB / T 14684-2011 "Construction Sand" and JGJ 52-2006 "General Concrete Sand, Stone Quality and Inspection Method Standards" provide normative guidance and requirements for construction sand an...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N27/60
Inventor 蒋荃孙飞龙吴帅刘顺利吴俊升陈火诚刘婷婷刘玉军赵春芝马丽萍郑雪颖邓宇
Owner 中国国检测试控股集团海南有限公司
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