CN111398131A - Evaluation method for concrete pollution effect preventing belt-discharge waste liquid - Google Patents
Evaluation method for concrete pollution effect preventing belt-discharge waste liquid Download PDFInfo
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Abstract
The invention discloses an evaluation method for the effect of preventing pollution of discharged waste liquid on concrete, which comprises a concrete antifouling effect test method based on a gas permeation method, an ion permeation method and a non-radioactive isotope diffusion depth method. The evaluation method integrates various influencing factors and can evaluate the effect of preventing the concrete from being polluted by the discharged waste liquid.
Description
Technical Field
The invention belongs to the field of concrete for nuclear power, and particularly relates to the field of concrete emission waste liquid pollution prevention.
Background
The concrete in the nuclear power plant may be contaminated by radioactive waste liquid due to the particularity of the working environment. The invasion of the waste liquid on the concrete surface is prevented, and the determination of the concrete waste amount and the difficulty degree of decontamination work in the decommissioning process are directly influenced. In order to prevent or minimize the intrusion of waste liquid into the concrete, antifouling agents or other protective materials are often applied to the surface of the concrete. However, how to evaluate the effect of preventing the waste liquid pollution caused by the discharged concrete does not have a set of reasonable, scientific and systematic evaluation method at present.
And (3) adopting the cement-based closed-pore and coating concrete surface antifouling materials for evaluating the antifouling effect.
The gas permeation method applies gas pressure gradient to both sides of a concrete sample, and measures the gas flow when gas (nitrogen) reaches a stable flowing state in the material; the stable flow under different pressure gradients is further measured, and the intrinsic permeability of the material is obtained through regression analysis, so that the gas permeation resistance of the concrete can be reflected.
The ion permeation method measures the ability of concrete to resist the penetration of aggressive media by testing the migration coefficient of chloride ions or the electric flux through a concrete specimen over a certain period of time.
The nonradioactive isotope diffusion depth method prepares a simulated pollution solution for the test by using nonradioactive isotopes (I, Cs and the like) of typical radionuclides, and uses the simulated pollution solution to diffuse on the surface of the concrete for a certain time to obtain the diffusion depth data of the typical nuclides in the concrete. And evaluating the antifouling effect by testing the distribution and enrichment degree of the isotope content in a certain depth on the concrete surface before and after pollution.
Disclosure of Invention
The invention provides a comprehensive evaluation method for evaluating the antifouling effect of concrete on preventing pollution of discharged waste liquid according to the defects of the conventional evaluation method. Thereby providing technical basis for the concrete anti-fouling scheme and providing reference for the establishment of the retirement scheme.
The invention provides an evaluation method for the pollution effect of concrete on waste liquid, which comprises an antifouling effect test method of a concrete antifouling material based on a gas permeation method, an ion permeation method and a non-radioactive isotope diffusion depth method;
the antifouling material is (1) a cement-based closed-pore antifouling material and (2) a coating concrete surface antifouling material;
) Two antifouling materials are adopted in each test method; the raw materials for preparing the cement-based closed-pore antifouling material comprise cement, quartz sand and active chemical substances, and the raw materials for preparing the coating concrete surface antifouling material comprise film-forming substances, fillers, auxiliaries and the like of high molecular resin; each test method has no special requirements on the shape of the concrete test block.
The concrete antifouling effect test method based on the gas permeation method is characterized in that nitrogen is used as a permeation medium, and the gas flow of the nitrogen in a material in a stable flowing state is measured by applying the nitrogen pressure gradient to two sides of a concrete sample; obtaining the inherent permeability of the material by regression analysis of the stable flow under different pressure gradients;
according to the concrete antifouling effect test method based on the ion permeation method, traditional chloride ions are used as a permeation medium, and the permeability of concrete to an erosion-resistant medium is measured by testing the migration coefficient of the chloride ions or the electric flux passing through a concrete test piece within a certain time;
the concrete anti-fouling effect test method based on the non-radioactive isotope diffusion depth method comprises the steps of preparing a simulated pollution liquid for a test by using a non-radioactive isotope of a typical radioactive nuclide, and diffusing the simulated pollution liquid on the surface of concrete for a certain time to obtain diffusion depth data of the typical nuclide in the concrete; and testing the isotope content distribution and enrichment degree in a certain depth of the concrete surface before and after pollution to evaluate the permeability of the concrete.
Preferably, the concrete antifouling effect test based on the gas permeation method comprises the following steps:
and (3) test block preparation: manufacturing the concrete test block and maintaining for 56 days;
coating an antifouling agent: coating an antifouling material on the circular surface of one side of the concrete test block, and forming a reference group test piece which is not coated with the antifouling material; placing the concrete test block coated with the antifouling material into a 60 ℃ oven for drying for 7 days, and then placing the concrete test block coated with the antifouling material in an environment with the temperature of 20 +/-2 ℃ and the humidity of 60 +/-5% for 14 days;
sampling: respectively weighing 0.1g of the concrete test block coated with the antifouling material before and after the concrete test block is placed in an oven;
detection and evaluation: the surface of the concrete test block coated with the antifouling material faces downwards, and a nitrogen permeability tester is used for testing the gas flow passing through the concrete test block under 0.15MPa, 0.2MPa, 0.3MPa and 0.4 MPa; and recording the stable gas flow under the pressure of each air inlet nozzle, calculating the apparent gas permeability, and obtaining the inherent gas permeability of the concrete test block through linear regression.
Preferably, the concrete antifouling effect test based on the ion permeation method comprises the following steps:
and (3) test block preparation: manufacturing the concrete test block and maintaining for 28 days;
coating an antifouling agent: coating an antifouling material on one side surface of the concrete test block, and forming a reference group test piece which is not coated with the antifouling material; and (3) putting the concrete test block coated with the antifouling material into a vacuum container for 3 hours after the concrete test block is in a saturated surface dry state, and continuing soaking for (18 +/-2) hours after the pressure of the vacuum container is reduced to normal pressure.
Detection and evaluation: and putting the concrete test block coated with the antifouling material into an RCM test device and an electric flux test device, contacting the surface of the concrete test block coated with the antifouling agent with a sodium chloride solution, connecting the surface coated with the antifouling agent with the negative electrode of a direct-current stabilized power supply, contacting the surface of the concrete test block not coated with the antifouling agent with a NaOH solution, and contacting the surface not coated with the antifouling agent with the positive electrode of the direct-current stabilized power supply to test the chloride ion migration coefficient or the electric flux of the concrete.
Preferably, the concrete antifouling effect test based on the nonradioactive isotope diffusion depth method comprises the following steps:
and (3) test block preparation: manufacturing the concrete test block and maintaining for 28 days;
coating an antifouling agent: coating the surface of the concrete test block with the concrete surface antifouling agent;
and (3) pollution test: placing the coated concrete test block in the container, and pouring the waterproof material into the container to be 10mm below the surface of the concrete test block; injecting the simulated pollution liquid into the container, enabling the liquid level of the simulated pollution liquid to be 10mm above the surface of the concrete test block, and standing for 180 days;
taking out the test block: taking the concrete test block out of the container, wiping the surface of the concrete test block, and standing and air-drying the concrete test block in a shade place;
sampling: weighing the concrete test block air-dried in the step, measuring the height of the concrete test block, grinding the concrete test block at intervals of 1mm from the surface of the concrete test block along the axial direction, collecting powder in the grinding process, and collecting 1g of powder at positions of 1mm, 3mm and 5mm respectively;
and (3) detection and evaluation, namely dissolving the powder obtained in the step in 1L distilled water respectively, testing the content of non-radioactive isotope ions in the solution, and converting to obtain the content of non-radioactive isotopes at different depth positions to realize the evaluation of the diffusion effect.
A set of feasible method is established, various influencing factors are considered, and the effect of preventing the waste liquid from being polluted by the concrete can be evaluated.
Drawings
FIG. 1 is a flow chart of a test and verification test of a concrete anti-fouling technical scheme in a nuclear power plant.
Detailed Description
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in further detail below.
The cement-based closed-cell concrete surface antifouling material disclosed by the invention develops a cement-based closed-cell antifouling material preparation technology based on the proportioning characteristics of a cement-based permeable crystalline material, and forms a more reasonable antifouling material formula through component optimization, formula optimization and full performance test.
The coating type concrete surface antifouling material is prepared by optimizing a film forming substance, and blending a solvent and a filler based on the isolation effect of the coating, so that the efficient antifouling coating is formed.
The invention relates to a construction technology of cement-based closed-pore and coating concrete surface antifouling materials, which develops matched construction technology research according to the area needing the antifouling materials, thereby determining the construction process and the construction scheme.
The invention discloses a method for evaluating the antifouling effect of an antifouling material on concrete based on a gas permeation method. Measuring the gas flow of nitrogen in a material when the nitrogen reaches a stable flowing state by using nitrogen as a permeation medium and adopting a method of applying a gas pressure gradient to two sides of a concrete test piece; the stable flow under different pressure gradients is further measured, and the intrinsic permeability of the material is obtained through regression analysis, so that the gas permeation resistance of the concrete can be reflected. The test procedure is as follows:
1. and (3) manufacturing a concrete test block with the size of phi 150mm × 300mm and curing to the age of 56 d.
2. And cutting out a round cake test piece with the thickness of 50mm from the middle part of the concrete column body by using a rock cutting machine, controlling the cutting error of the thickness to be +/-2 mm, and cutting out at least 3 round cake test pieces from each column. And coating an antifouling material on the circular surface of one side of the round cake test piece, and forming a reference group test piece which is not coated with the antifouling material.
3. And (3) putting the round cake test piece into a 60 ℃ oven for drying for 7 days, and then putting the test piece into an environment with the temperature of 20 +/-2 ℃ and the humidity of 60 +/-5% for 14 days. The mass of the test piece was weighed to 0.1g before and after drying.
4. All the concrete round cake test pieces were coated with epoxy resin on their sides and dried at room temperature for 2 d.
5. And (3) placing the surface coated with the antifouling material downwards into a nitrogen permeability tester, and testing the gas flow of the round cake test piece passing through the concrete test piece under the conditions of 0.15MPa, 0.2MPa, 0.3MPa and 0.4 MPa.
6. And calculating the apparent gas permeability according to the stable gas flow under the pressure of each air inlet nozzle, and obtaining the inherent gas permeability of the material through linear regression.
The average method comprises the following steps: the gas permeability of the concrete is graded, and the antifouling effect is evaluated through the grade change of the nitrogen permeability of the concrete before and after the antifouling material is coated.
The method for evaluating the antifouling effect of the antifouling material on the concrete is based on a common chloride ion permeability test method in a concrete durability test. The traditional chloride ions are used as a permeation medium, and the capacity of concrete for resisting the permeation of the aggressive medium is measured by testing the migration coefficient of the chloride ions or the electric flux passing through a concrete test piece within a certain period of time. The test steps are as follows:
1. a concrete sample block with the size of phi 100mm × 200mm is manufactured and cured to a specified age (28 d).
2. A rock cutting machine is used for cutting a disc test piece with the thickness of 50mm from the middle of a concrete column body, an antifouling agent is coated on the circular surface of one side of the disc test piece, maintenance is carried out according to the requirement of the antifouling agent, and a standard group test piece without the antifouling agent is synchronously formed.
3. And (3) putting the concrete test piece in a saturated surface dry state into a vacuum container for 3h, and continuing to soak for (18 +/-2) h after the pressure of the vacuum container is reduced to normal pressure.
4. And (3) putting the test block into an RCM test device and an electric flux test device, and testing the chloride ion migration coefficient or the electric flux of the concrete. When the test block is placed, the surface of the concrete test block coated with the antifouling agent is contacted with a sodium chloride solution and is connected with the negative electrode of the direct-current stabilized power supply, and the surface which is not coated with the antifouling agent is contacted with a NaOH solution and is contacted with the anode of the direct-current stabilized power supply.
The evaluation method comprises the following steps: according to the test value of the concrete chloride ion diffusion coefficient or the electric flux, the chloride ion penetration resistance of the concrete coated with the antifouling agent and the standard concrete is evaluated in a grade manner by referring to the concrete durability test evaluation standard (JGJ/T193-2009), so that the antifouling effect of the antifouling agent on the concrete is indirectly measured.
The method for evaluating the anti-fouling effect of the concrete based on the non-radioactive isotope diffusion depth method is based on the simulated pollution liquid of the non-radioactive isotope of the typical radioactive nuclide, so that the method for evaluating the anti-fouling effect is close to the actual pollution condition of a nuclear power station and is safer. A simulated pollution solution for a test is prepared by using a non-radioactive isotope (I, Cs and the like) of a typical radionuclide, and the simulated pollution solution is diffused on the surface of concrete for a certain time to obtain diffusion depth data of the typical radionuclide in the concrete. And evaluating the antifouling effect by testing the distribution and enrichment degree of the isotope content in a certain depth on the concrete surface before and after pollution. The test steps are as follows:
1. a concrete test block with the size of 100mm × 100mm, 100mm × 100mm and 100 d age is manufactured and maintained.
2. And coating an antifouling agent on the surface of the concrete sample according to the requirement, coating the other surfaces of the concrete sample, and curing according to the requirement of the antifouling agent, and synchronously forming a comparative concrete sample which is not coated with the antifouling agent.
3. Placing the concrete coated with the antifouling agent with the surface facing downwards into a suitable container, and placing two glass rods at the bottom of the container for supporting the concrete test block
4. 1 mol/L CsCl solution/NaI (or other non-radioactive isotope compound to prepare simulated pollution liquid) is injected to ensure that the liquid level is 10mm above the core sample, 180 days are placed, and the CsCl solution/NaI (or other non-radioactive isotope compound to prepare simulated pollution liquid) is added carefully to keep the liquid level height, so that non-radioactive nuclides can be fully and naturally diffused into the concrete.
5. Taking out the concrete test block, wiping the surface of the concrete, and standing and air-drying the concrete test block in a shade.
6. Weighing the air-dried test block, measuring the height, grinding every 1mm from one end in contact with the source liquid pool along the axial direction, collecting powder in the grinding process, and collecting 1g of powder at positions of 1mm, 3mm and 5mm respectively.
7. After the powder is dissolved in 1L distilled water, the ion content of the non-radioactive isotope (I, Cs and the like) in the solution is tested by a mass spectrometer, and the content of the corresponding non-radioactive isotope (I, Cs and the like) in the concrete is converted.
The evaluation method comprises the following steps:
the antifouling effect can be characterized by the effect of reducing the absorption of non-radioactive nuclides and is calculated according to the following formula:
△CU＝(CU-CU1)/CU×100％
△ CU-reduction of non-radionuclide absorption,%;
CU-mean Cs content of baseline group, mean of 3 deep non-radioisotope (I, Cs, etc.) absorptions per core sample;
CU 1-average content of Cs in the group of coated antifouling agents, which is the average of the absorption of 3 deep non-radioactive isotopes (I, Cs, etc.) per core sample.
The evaluation of the influence of the antifouling agent on the key performance of the concrete is carried out by carrying out mechanical property, durability and nitrogen permeability tests on the concrete adopting an antifouling scheme, and the key performance index is not influenced after the antifouling treatment of the concrete is verified.
According to the deterioration test research of the cement-based closed-cell antifouling material, the failure condition of the cement-based closed-cell antifouling material under the accelerated corrosion condition is researched according to the performance characteristics of the cement-based closed-cell antifouling material, and a basis is provided for evaluating the durability of the cement-based closed-cell antifouling material. The test steps are as follows:
1) forming a cubic test block and an impervious test block by adopting CAP1400 concrete mixing proportion according to a method of cement-based permeable crystalline waterproof materials (GB18445-2012), and coating a cement-based permeable crystalline antifouling material with the coating dosage of 1.5kg/m 2.
2) Analyzing partial acid and partial alkaline environment which may appear in the nuclear power station pollution liquid, and respectively preparing acidic simulated pollution liquid with the pH value of 3 and the pH value of 5 and alkaline simulated pollution liquid with the pH value of 11 and the pH value of 13.
3) And respectively soaking the test block coated with the cement-based capillary crystalline antifouling material in an acidic simulated pollution solution and an alkaline simulated pollution solution, and taking out the test block after the test block is in the target age. The impervious test block is used for testing the impervious pressure change of the test block after being corroded by acid and alkali. And (3) drying the cubic test block, continuously soaking the cubic test block in a non-radioactive isotope simulation pollution solution, and after soaking the cubic test block in the non-radioactive isotope simulation pollution solution for a target time, grinding the cubic test block in a layering manner, and testing the penetration depth of the non-radioactive isotope.
4) And (3) integrating the change of the permeation resistance pressure of the concrete coated with the cement-based permeable crystalline antifouling material in an acid-base environment and the change of the permeation depth of the non-radioactive isotope simulation pollution liquid, and evaluating the failure condition of the cement-based permeable crystalline antifouling material under the unfavorable condition.
5) Establishing a corresponding relation between the service life of the cement-based permeable crystalline antifouling material and the service life of the cement-based permeable crystalline antifouling material under a normal condition under an acid-base accelerated deterioration condition, and evaluating the durability of the cement-based permeable crystalline antifouling material.
According to the degradation test research of the coating antifouling material, the effects of stress and other factors under the natural atmosphere exposure environment are simulated in a laboratory, so that the antifouling coating is degraded at a higher speed under the action of higher strength of the factors, the test time is shortened, and the purpose of quickly evaluating the performance of the coating is achieved.
The method comprises the following steps:
1. light aging test
The substrate of the anti-fouling paint light accelerated aging test is a 150mm × 70mm × 3mm steel plate, the light source is a xenon arc lamp and a fluorescent ultraviolet light respectively, the test conditions of the xenon arc lamp and the fluorescent ultraviolet light are given in Table 1, the thickness of a paint film is 30 mu m, the surface drying time is 0.5h, the color and the light loss rate of the paint are observed after the anti-fouling paint is subjected to light aging, the aging condition of the anti-fouling paint is evaluated according to a rating method of color paint and varnish coating aging (GB/T1766 and 2008), and the performances of the coating such as glossiness, adhesive force, hardness and the like after the aging test are mainly tested.
TABLE 1 photoaging test conditions
2. High temperature aging test
The high-temperature aging test mainly researches the performance change rule of the antifouling coating under the conditions of high temperature (60 ℃) and room temperature (30 ℃). And respectively testing the change rules of the tensile strength, the elongation at break, the tearing strength and the hardness of the antifouling coating under the conditions of high temperature and room temperature within 1-7 d of maintenance time.
3. The prediction of the coating life is carried out by establishing an equivalent relationship between the accelerated test time and the outdoor natural environment exposure test time.
4. The common coatings on the market are selected to carry out the accelerated aging test by adopting the method, and the aging resistance of the antifouling coating is compared with that of the existing coating.
The invention discloses a research on the decontamination convenience of concrete coated with an antifouling agent, and a concrete cutting process method after the antifouling agent is used is researched from the decontamination convenience, so that a decontamination method is optimized. The test steps are as follows:
1. 3 groups of concrete test blocks with the thickness of 150mm × 150mm × 150mm are formed according to CAP1400 existing mix proportion, the 3 groups of test blocks are divided into a reference group, a cement-based closed-cell antifouling material coating group and a coating antifouling material coating group, the antifouling material is coated on the forming surface of the test blocks, and the wear resistance of the concrete is tested according to road engineering cement and cement concrete test regulations (JTG E30-2005).
2. And soaking the reference group and the concrete test block coated with the two types of anti-fouling materials in a non-radioactive isotope simulated pollution liquid, and after the test block is soaked for a certain age, testing the distribution of the non-radioactive isotope concentration along with the depth by means of layered grinding, and determining the maximum depth of the surface concrete to be stripped.
3. According to the distribution condition of the non-radioactive isotope concentration along with the depth, the surface pollution of the concrete is analyzed to belong to adhesive pollution, weak-fixation pollution or strong-fixation pollution after the cement-based closed-pore antifouling material and the coating antifouling material are coated.
4. The fixed pollution (diffusion and infiltration into the base material) can be decontaminated by spraying high-pressure water flow with abrasive, and the adhesive pollution (molecular adsorption) or weak fixed pollution (physical adsorption) can be decontaminated by adopting a chemical decontamination method.
5. And (3) comparing and analyzing the decontamination convenience of the concrete by adopting a target decontamination method before and after the antifouling agent is coated, and adjusting and optimizing the parameters of the antifouling material such as the material property, the coating thickness and the like on the basis.
The foregoing embodiments are merely illustrative of the principles and utilities of the present invention and are not intended to limit the invention. Any person skilled in the art can modify or change the above-mentioned embodiments without departing from the spirit and scope of the present invention. Accordingly, it is intended that all equivalent modifications or changes which can be made by those skilled in the art without departing from the spirit and technical spirit of the present invention be covered by the claims of the present invention.
Claims (4)
1. An evaluation method for the pollution prevention effect of the concrete with the discharged liquid is characterized by comprising an antifouling effect test method of a concrete antifouling material based on a gas permeation method, an ion permeation method and a non-radioactive isotope diffusion depth method;
the antifouling material is a cement-based closed-pore antifouling material based on a cement-based permeable crystalline material; two antifouling materials are adopted in each test method; the raw materials for preparing the cement-based closed-pore antifouling material comprise cement, quartz sand and active chemical substances, and the raw materials for preparing the coating concrete surface antifouling material comprise film-forming substances, fillers, auxiliaries and the like of high molecular resin; each test method has no special requirements on the shape of the concrete test block.
The concrete antifouling effect test method based on the gas permeation method is characterized in that nitrogen is used as a permeation medium, and the gas flow of the nitrogen in a material in a stable flowing state is measured by applying the nitrogen pressure gradient to two sides of a concrete sample; obtaining the inherent permeability of the material by regression analysis of the stable flow under different pressure gradients;
according to the concrete antifouling effect test method based on the ion permeation method, traditional chloride ions are used as a permeation medium, and the permeability of concrete to an erosion-resistant medium is measured by testing the migration coefficient of the chloride ions or the electric flux passing through a concrete test piece within a certain time;
the concrete anti-fouling effect test method based on the non-radioactive isotope diffusion depth method comprises the steps of preparing a simulated pollution liquid for a test by using a non-radioactive isotope of a typical radioactive nuclide, and diffusing the simulated pollution liquid on the surface of concrete for a certain time to obtain diffusion depth data of the typical nuclide in the concrete; and testing the isotope content distribution and enrichment degree in a certain depth of the concrete surface before and after pollution to evaluate the permeability of the concrete.
2. The method for evaluating the effect of preventing the pollution of the discharged liquid on the concrete according to claim 1, wherein the concrete antifouling effect test based on the gas permeation method comprises the following steps:
and (3) test block preparation: manufacturing the concrete test block and maintaining for 56 days;
coating an antifouling agent: coating an antifouling material on the circular surface of one side of the concrete test block, and forming a reference group test piece which is not coated with the antifouling material; placing the concrete test block coated with the antifouling material into a 60 ℃ oven for drying for 7 days, and then placing the concrete test block coated with the antifouling material in an environment with the temperature of 20 +/-2 ℃ and the humidity of 60 +/-5% for 14 days;
sampling: respectively weighing 0.1g of the concrete test block coated with the antifouling material before and after the concrete test block is placed in an oven;
detection and evaluation: the surface of the concrete test block coated with the antifouling material faces downwards, and a nitrogen permeability tester is used for testing the gas flow passing through the concrete test block under 0.15MPa, 0.2MPa, 0.3MPa and 0.4 MPa; and recording the stable gas flow under the pressure of each air inlet nozzle, calculating the apparent gas permeability, and obtaining the inherent gas permeability of the concrete test block through linear regression.
3. The method for evaluating the effect of preventing the pollution of the discharged liquid on the concrete according to claim 1, wherein the concrete antifouling effect test based on the ion permeation method comprises the following steps:
and (3) test block preparation: manufacturing the concrete test block and maintaining for 28 days;
coating an antifouling agent: coating an antifouling material on one side surface of the concrete test block, and forming a reference group test piece which is not coated with the antifouling material; and (3) putting the concrete test block coated with the antifouling material into a vacuum container for 3 hours after the concrete test block is in a saturated surface dry state, and continuing soaking for (18 +/-2) hours after the pressure of the vacuum container is reduced to normal pressure.
Detection and evaluation: and putting the concrete test block coated with the antifouling material into an RCM test device and an electric flux test device, contacting the surface of the concrete test block coated with the antifouling agent with a sodium chloride solution, connecting the surface coated with the antifouling agent with the negative electrode of a direct-current stabilized power supply, contacting the surface of the concrete test block not coated with the antifouling agent with a NaOH solution, and contacting the surface not coated with the antifouling agent with the positive electrode of the direct-current stabilized power supply to test the chloride ion migration coefficient or the electric flux of the concrete.
4. The method for evaluating the effect of preventing the pollution of the discharged liquid on the concrete according to claim 1, wherein the concrete antifouling effect test based on the nonradioactive isotope diffusion depth method comprises the following steps:
and (3) test block preparation: manufacturing the concrete test block and maintaining for 28 days;
coating an antifouling agent: coating the surface of the concrete test block with the concrete surface antifouling agent;
and (3) pollution test: placing the coated concrete test block in the container, and pouring the waterproof material into the container to be 10mm below the surface of the concrete test block; injecting the simulated pollution liquid into the container, enabling the liquid level of the simulated pollution liquid to be 10mm above the surface of the concrete test block, and standing for 180 days;
taking out the test block: taking the concrete test block out of the container, wiping the surface of the concrete test block, and standing and air-drying the concrete test block in a shade place;
sampling: weighing the concrete test block air-dried in the step, measuring the height of the concrete test block, grinding the concrete test block at intervals of 1mm from the surface of the concrete test block along the axial direction, collecting powder in the grinding process, and collecting 1g of powder at positions of 1mm, 3mm and 5mm respectively;
and (3) detection and evaluation, namely dissolving the powder obtained in the step in 1L distilled water respectively, testing the content of non-radioactive isotope ions in the solution, and converting to obtain the content of non-radioactive isotopes at different depth positions to realize the evaluation of the diffusion effect.
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