In-situ quantitative treatment method for rust on iron tailings asphalt surface

Abstract

The application provides an in-situ quantitative treatment method for rust spots of iron tailing asphalt surface layer, and belongs to the field of road engineering maintenance, and comprises the following steps: S1, image acquisition and division of evaluation units; S2, test patch arrangement and determination of surface iron migration intensity; S3, demarcation of a to-be-treated area and calculation of iron migration amount; S4, determination of treatment film dosage according to the iron migration amount; S5, in-situ treatment; and S6, review of whether the treatment effect meets the standard. The application identifies the to-be-treated evaluation unit which is still continuously releasing migratory iron through the surface iron migration intensity, accurately locks the active area, determines the dry mass of the treatment film through the iron migration amount of the treatment area, the unit mass iron treatment capacity of the iron migration treatment film and a treatment safety factor, so that the treatment material dosage has a measurable basis, and the treatment endpoint is determined through the review of the surface iron migration intensity, the newly added rust spot area after the scale correction and the spatial registration.

Description

Technical Field

[0001] This invention relates to the field of road engineering maintenance technology, and in particular to an in-situ quantitative treatment method for rust stains on asphalt pavement of iron tailings. Background Technology

[0002] Iron tailings aggregate can be used in asphalt pavement to improve the resource utilization level of solid waste. In actual engineering projects, some asphalt mixture pavements containing iron tailings fine aggregate, iron tailings powder, or iron tailings aggregate components will develop yellowish-brown to reddish-brown rust spots after service. This type of rust may originate from exposed iron tailings particles, residual iron-containing deposits, or migrating iron ions continuously released under the action of oxygen in road surface water.

[0003] Current treatment methods typically determine whether to clean, cover, apply a film, or perform partial milling based on the area of ​​rust or on-site experience. This approach has the following problems: First, it is difficult to distinguish between historically residual discolored areas and areas that are still continuously releasing migrating iron, resulting in treatment areas that are either too large (treating the already stabilized historical traces) or too small (missing the source of continuous release). Second, the amount of treatment material used lacks a quantitative relationship with the amount of iron migration on-site, easily leading to undertreatment or overtreatment. Undertreatment causes rust recurrence, while overtreatment results in material waste. Third, whether treatment is complete usually depends on visual observation, lacking measurable and verifiable engineering acceptance indicators. Different technicians make significant differences in their judgments, making it difficult to unify quality control standards.

[0004] In summary, the existing technology lacks a method for in-situ treatment of asphalt surfaces in iron tailings that have already developed rust. The fundamental technical problem lies in: how to accurately identify the parts of the rusted area that still have the ability to continuously release migrating iron; how to quantitatively determine the amount of treatment material to be used based on the iron migration measured on site; and how to objectively determine the treatment endpoint through measurable indicators, so as to free the entire treatment process from reliance on experience and achieve measurable and verifiable engineering control. Summary of the Invention

[0005] In view of this, the present invention proposes an in-situ quantitative treatment method for rust stains on asphalt surfaces of iron tailings. Existing technologies cannot accurately identify the parts of the rust area that still have the ability to continuously release migrating iron, it is difficult to quantitatively determine the amount of treatment materials based on the iron migration measured on site, and there is a lack of objective determination of the treatment endpoint through measurable indicators.

[0006] The technical solution of this invention is implemented as follows: This invention provides an in-situ quantitative treatment method for rust stains on iron tailings asphalt surfaces, comprising the following steps: S1, acquiring images of the iron tailings asphalt surface with rust stains, determining the rust stain coloration area and its surrounding transition area, and dividing it into evaluation units; S2, placing iron migration test patches in each evaluation unit, measuring the surface iron migration intensity of each evaluation unit, and setting a treatment threshold; S3, defining the evaluation units with surface iron migration intensity higher than the treatment threshold as areas to be treated and calculating the amount of iron migration in that area; S4, determining the amount of iron migration treatment film to be used based on the amount of iron migration in the areas to be treated; S5, based on the amount of iron migration treatment film used, applying the iron migration treatment film to the iron migration treatment area for in-situ treatment.

[0007] Based on the above technical solutions, preferably, the transition zone is an early warning area formed by the outward expansion of the boundary of the rust coloring area, used to cover areas that have not yet developed color but have the risk of migratory iron release.

[0008] Based on the above technical solutions, preferably, at least two iron migration test patches are set in the same evaluation unit, and the iron migration test patch with the highest measured iron content is used as the basis for pre-treatment evaluation during the pre-treatment screening stage.

[0009] In a further preferred embodiment, during the post-treatment review stage, when the relative standard deviation of the iron content measured by each iron migration test patch within the same evaluation unit is not greater than 10%, the average value is taken as the representative iron content; when the relative standard deviation is greater than 10%, the maximum value is taken as the representative iron content.

[0010] Based on the above technical solutions, preferably, the treatment threshold is determined according to the iron migration test results of the control area, and is used as the basis for determining whether the evaluation unit needs treatment.

[0011] Based on the above technical solutions, preferably, the amount of iron migration in the area to be treated is calculated based on the surface iron migration intensity of the evaluation unit, the area of ​​the evaluation unit, and the patch test results, and is used to characterize the release level of migrating iron in the area to be treated.

[0012] Based on the above technical solutions, preferably, the amount of iron migration treatment membrane used is determined according to the amount of iron migration in the area to be treated, the iron treatment capacity per unit mass of the iron migration treatment membrane, and the treatment safety factor.

[0013] Based on the above technical solutions, preferably, when the surface iron migration intensity obtained after treatment is still higher than the treatment threshold, the corresponding area is determined as the area to be treated again, and the iron migration amount in the area is measured again, the amount of iron migration treatment film is calculated, and in-situ treatment is performed again.

[0014] Furthermore, preferably, the method also includes step S6, which involves re-measuring the surface iron migration intensity after treatment and verifying whether the treatment effect meets the standard in conjunction with the newly added rust area; when the verified surface iron migration intensity is not higher than the treatment threshold and the newly added rust area does not exceed the preset area judgment threshold, the treatment effect of the iron tailings asphalt surface layer is determined to meet the standard.

[0015] Furthermore, preferably, if the treatment effect still fails to meet the standard after two consecutive treatments, milling repair is performed on the corresponding area.

[0016] The in-situ quantitative treatment method for rust stains on asphalt surfaces in iron tailings, as described in this invention, has the following advantages over existing technologies: (1) The present invention identifies the evaluation unit to be treated by the surface iron migration intensity to identify the unit that is still releasing migrating iron. This avoids expanding the treatment range based solely on the area of ​​historical rust. Since historical color marks may have stabilized and no longer release new migrating iron, treating the entire range would cause unnecessary material consumption and extended construction time. The present invention accurately locks the active area through patch testing, significantly improving treatment efficiency.

[0017] (2) The present invention obtains the treatment threshold by actual measurement of the control area without rust in the same road section, avoiding the use of human experience threshold. Since the background iron migration level varies greatly under different road sections, different iron tailings sources and environmental conditions, a unified experience threshold is easy to cause misjudgment. The present invention uses the uncorroded area of ​​the same road section as the benchmark, and the threshold is on-site targeted, making the judgment more scientific.

[0018] (3) The present invention determines the dry mass of the treatment membrane by the amount of iron migration in the treatment area, the iron treatment capacity per unit mass of the iron migration treatment membrane, and the treatment safety factor, so that the amount of treatment material has a measurable basis and reduces the risk of undertreatment caused by the difference between the calibration of the iron-containing standard solution and the on-site treatment conditions; the introduction of the safety factor takes into account the difference between the calibration and the on-site conditions and avoids the waste of materials caused by excessive conservatism.

[0019] (4) The present invention determines the treatment endpoint by verifying the surface iron migration intensity and the area of ​​newly added rust after scale correction and spatial registration, so that the treatment results are verifiable and have a basis for engineering acceptance. The dual judgment indicators verify the treatment effect from two dimensions: chemical migration activity and apparent rust expansion, which is more reliable than single appearance observation. Attached Figure Description

[0020] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0021] Figure 1 This is a schematic flowchart of the in-situ quantitative processing method of the present invention; Figure 2 This is a schematic diagram of the treatment mechanism of the iron migration treatment membrane of the present invention; Figure 3 This is a schematic diagram of the iron migration test patch of the present invention. Detailed Implementation

[0022] To enable those skilled in the art to better understand the technical solutions in this specification, the technical solutions in the embodiments of this specification will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0023] In the description of the embodiments of the present invention, words such as "for example" or "for instance" are used to indicate examples, illustrations, or explanations. Any embodiment or design described as "for example" or "for instance" in the embodiments of the present invention should not be construed as being more preferred or advantageous than other embodiments or designs. Rather, the use of words such as "for example" or "for instance" is intended to present the relevant concepts in a specific manner.

[0024] In the description of the embodiments of the present invention, the term "multiple" means two or more. For example, multiple systems means two or more systems, and multiple screen terminals means two or more screen terminals. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the indicated technical features. Thus, a feature defined with "first" or "second" may explicitly or implicitly include one or more of that feature. The terms "comprising," "including," "having," and variations thereof all mean "including but not limited to," unless otherwise specifically emphasized.

[0025] like Figure 1 As shown, the present invention provides an in-situ quantitative treatment method for rust stains on asphalt surfaces in iron tailings, comprising the following steps: S1. Image acquisition is performed on the asphalt surface of the iron tailings with rust, the rust color area and the surrounding transition area are determined, and the rust color area and the transition area are divided into n evaluation units, n≥2.

[0026] Among them, the iron tailings asphalt surface layer is an asphalt mixture surface layer containing iron tailings fine aggregate, iron tailings mineral powder or iron tailings aggregate components.

[0027] S2, Iron migration test patches are placed in each evaluation unit to measure the surface iron migration intensity of each evaluation unit and set a treatment threshold. Specifically, at least one patch with a contact area of ​​[missing information] is placed in each evaluation unit. Iron migration test patches; when two or more iron migration test patches are deployed in the same evaluation unit, the maximum iron content measured by each iron migration test patch during the pre-treatment screening stage is taken as the representative iron content of that evaluation unit. For the first For each evaluation unit, the surface iron migration intensity is calculated using the following formula. :

[0028]

[0029] in, For the first The amount of iron measured by the iron migration test patch within each evaluation unit, in mg; The average iron content of the blank iron migration test patch is expressed in mg. The contact area of ​​the iron migration test patch, in units of ; To measure the contact time, the unit is h; The iron recovery correction factor is obtained by calibrating the iron migration test patches of the same batch with an iron-containing standard solution. The coefficient is dimensionless. The unit is ;when At that time, the first The surface iron migration intensity of each evaluation unit is calculated as zero.

[0030] Iron recovery correction factor Contact time was determined by contacting iron migration test patches from the same batch with an iron-containing standard solution. The iron concentration was obtained through subsequent calibration; when the iron concentration of the standard solution used for calibration was... Volume is The amount of iron measured by the calibrated iron migration test patch is When, calculate according to the following formula:

[0031] when If the value is less than 0.70 or greater than 1.30, the iron migration test patches of the same batch should be recalibrated or re-prepared.

[0032] The same method was used to calculate the number in the control area. Iron migration intensity of the control surface of the iron migration test patch When the iron migration test patches in the control area are damaged, contaminated, have failed contact, or exhibit abnormalities, the data from the abnormal patch should be removed and the iron migration test patches from the same batch should be retested. After removing the abnormal data and completing the retest, the following formula should be used as the treatment threshold. :

[0033] in, The first in the control area The iron migration intensity of the control surface corresponding to each iron migration test patch, in units of ; Treatment threshold, unit: .

[0034] like Figure 3 As shown, the iron migration test patch is composed of a cellulose filter membrane substrate layer, a sodium carboxymethyl cellulose water-retaining layer, and a phytate iron-catching functional layer stacked from top to bottom. A sealing ring is sandwiched between the edge of the iron migration test patch and the asphalt surface to ensure a firm adhesion.

[0035] Moisture content per unit area of ​​iron migration test patch Calculate using the following formula:

[0036] in, For testing the wet quality of the patch for iron migration, Dry quality of the patch for iron migration testing; 0.02g / Up to 0.20g / Meanwhile, after the iron migration test patch was removed, the iron content was determined by inductively coupled plasma atomic emission spectrometry after extraction with nitric acid. The blank patch, control patch, treatment evaluation unit patch and verification patch of the same batch were subjected to the same extraction and detection conditions.

[0037] In addition, steps S1 to S2 are performed under the condition that there is no standing water on the road surface before the test and no rainfall during the test; or after the specified wetting pretreatment, which is to use deionized water or clean water on site at a concentration of 0.05 g / L. Up to 0.30g / Spray the surface of the road to be tested to moisten it, let it stand for 5 to 30 minutes and confirm that there is no standing water on the surface before placing the iron migration test patch; record the ambient temperature and relative humidity during the test; the evaluation unit is a rectangular unit or a grid unit, and the unit area is 100. Up to 2500 Measure the contact time The treatment contact time ranges from 0.5 hours to 4 hours. The duration is 0.5h to 6h.

[0038] S3, the evaluation units where the surface iron migration intensity is higher than the treatment threshold are designated as the treatment area and the amount of iron migration in that area is calculated. Specifically, the following conditions will be met: The evaluation unit is determined as the evaluation unit to be treated; when two or more evaluation units to be treated share a common boundary, the evaluation units to be treated that share a common boundary are merged into one iron migration treatment area.

[0039] S4. Determine the dosage of the iron migration treatment membrane based on the amount of iron migration in the area to be treated. Calibrate the iron treatment capacity per unit mass of the same batch of iron migration treatment membranes using an iron-containing standard solution. And introduce a treatment safety factor. Determine the dry weight of the iron migration treatment membrane. The treatment safety factor is used to cover the differences between the calibration conditions of the iron-containing standard solution and the on-site iron morphology, road surface texture, and membrane-pavement contact state. Specifically, it is the contact time between the same batch of iron migration treatment membrane and the iron-containing standard solution. Subsequently, the processing capacity per unit mass of iron was measured. Weigh out the dry mass as The iron migration treatment membrane is made to meet the following requirements:

[0040]

[0041] in, The dry mass of the iron migration treatment film is expressed in grams. The iron treatment capacity per unit mass of the iron migration treatment membrane, calibrated with an iron-containing standard solution, is expressed in mg / g; λ is the treatment safety factor, a dimensionless coefficient ranging from 1.05 to 1.50; the field-validated capacity is obtained using on-site rust extract or road surface washing solution. When λ is not less than / When not obtained When λ is not less than 1.05.

[0042] S5, according to the determined membrane dosage, apply the iron migration treatment membrane to the iron migration treatment area for in-situ treatment. Specifically, the dry weight is... The iron migration treatment film is applied to the iron migration treatment area and the treatment contact time is maintained. Then remove it.

[0043] like Figure 2As shown, the iron migration treatment membrane comprises a hydrophilic water-retaining substrate, an iron ion binding component, and phytate. The iron ion binding component is used to complex or capture migrating iron ions, and the phytate is used to undergo a stabilization reaction with the surface of residual iron-containing sediments and exposed iron tailings particles. More specifically, it is composed of a polyvinyl alcohol-sodium alginate-chitosan composite hydrophilic water-retaining substrate, tannic acid, phytate, citrate, and glycerol. The iron ion binding component is used to bind migrating iron ions, the phytate is used to form a stabilization reaction product with the surface of residual iron-containing sediments and exposed iron tailings particles, and the citrate is used to promote the conversion of some colored iron-containing sediments into iron forms that can be bound by the iron ion binding component. The iron ion binding component is preferably tannic acid, tannic acid, or a water-soluble component containing polyphenol complexing groups. Based on 100 parts by weight of a 6% to 10% aqueous solution of polyvinyl alcohol, sodium alginate comprises 0.5 to 3 parts by weight, chitosan or its salt comprises 0.2 to 2 parts by weight, tannic acid comprises 0.2 to 3 parts by weight, phytate comprises 0.5 to 5 parts by weight, citrate comprises 0.1 to 2 parts by weight, and glycerol comprises 0.2 to 2 parts by weight.

[0044] S6. After treatment, the surface iron migration intensity is re-measured, and the treatment effect is verified in conjunction with the newly added rust area to determine whether the treatment has met the requirements for inhibiting rust development. Rust development is defined as the surface iron migration intensity of the evaluation unit exceeding the treatment threshold determined for the rust-free control area in the same road section, or the newly added rust area in the adjacent verification area exceeding the area determination threshold after treatment. This method treats not simply historical discoloration marks, but areas that still possess the ability to release migrating iron based on surface iron migration intensity determination; historical residual discoloration areas with surface iron migration intensity not exceeding the treatment threshold are not considered as evaluation units to be treated.

[0045] Specifically, after treatment, the iron relocation treatment area and transition zone will be redeployed. Sheet metal migration test patch, The surface iron migration intensity at each verification location was measured according to the method in step S2. The following formula is taken as the verification surface iron migration strength. : J r =max{J r,1 J r,2 ,…,J r,p}

[0046] Images before and after treatment were acquired under the same conditions and segmented using the same parameters. Scale correction and spatial registration were performed on the images before and after treatment, and the area of ​​newly added rust in the adjacent verification zone was calculated. The adjacent verification area is the region extending 20cm outward from the outer boundary of the iron migration treatment area; in the control area image, which has the same area as the adjacent verification area, is on the same road section, and shows no rust, the mis-segmented area of ​​the control area is obtained using the same image segmentation parameters. ;in, The newly added rust area in the adjacent review area, in units of ; The area of ​​misdivided control region, in units of ; The smallest recognizable area of ​​the image, in units of ; This is the area threshold for determination, in units of... ;when Smaller than the minimum recognizable area of ​​the image At that time, with As a threshold for area determination Otherwise As a threshold for area determination When satisfied ,and At that time, it was determined that the iron migration treatment area met the requirements for inhibiting the continuous development of rust. Images before and after treatment were acquired using the same shooting height, shooting angle, lighting conditions, and color correction board. Image segmentation parameters included hue, saturation, and brightness thresholds corresponding to yellowish-brown to reddish-brown rust in the HSV color space, or lightness, red-green axis, and yellow-blue axis thresholds corresponding to yellowish-brown to reddish-brown rust in the CIELAB color space. Scale correction and spatial registration used the color correction board, fixed road surface markers, or evaluation unit boundaries as registration references. When the control area was mis-segmented... If the area exceeds 5% of the adjacent verification area, re-acquire the image or adjust the lighting conditions, color correction conditions, and image segmentation parameters.

[0047] like Figure 1 In one embodiment shown, the transition zone is a warning area formed by extending outward from the boundary of the rust coloring area. It covers areas that have not yet developed color but pose a risk of migratory iron release. The transition zone is located within 20cm outside the boundary of the rust coloring area, covering areas near the rust edge that may contain migratory iron release that has not yet developed obvious color. This range matches the size of the on-site patch layout, the grid size of the evaluation unit, and the width of conventional road surface maintenance operations, reducing missed boundary detections without significantly expanding the treatment area.

[0048] like Figure 1 In one embodiment, at least two iron migration test patches are arranged within the same evaluation unit. During the pre-treatment screening stage, the iron migration test patch with the highest measured iron content is used as the basis for pre-treatment evaluation. Specifically, when two or more iron migration test patches are arranged within the same evaluation unit, the maximum iron content measured by each iron migration test patch is taken as the representative iron content of that evaluation unit during the pre-treatment screening stage. During the post-treatment review stage, when the relative standard deviation of the iron content measured by each iron migration test patch within the same evaluation unit is not greater than 10%, the average value is taken as the representative iron content; when the relative standard deviation is greater than 10%, the maximum value is taken as the representative iron content.

[0049] like Figure 1 In one embodiment shown, during the post-treatment review stage, when the relative standard deviation of the iron content measured by each iron migration test patch in the same evaluation unit is not greater than 10%, the average value is taken as the representative iron content; when the relative standard deviation is greater than 10%, the maximum value is taken as the representative iron content.

[0050] like Figure 1 In one embodiment shown, the treatment threshold is determined based on the iron migration test results of the control area and serves as the basis for determining whether the evaluation unit requires treatment. Treatment Threshold Instead of preset empirical thresholds, the values ​​were obtained from actual measurements in a control area of ​​iron tailings asphalt pavement with the same road section, the same asphalt pavement structure, and no visible rust. To avoid the influence of outliers caused by patch contamination, damage, or contact failure, when there were obvious anomalies in the control area patch data, the abnormal data were removed, and iron migration test patches from the same batch were retested. The maximum iron migration intensity of the control surface after the retest was then taken as the baseline. .

[0051] like Figure 1 In one embodiment shown, the amount of iron migration in the treatment area is calculated based on the surface iron migration intensity of the evaluation unit, the area of ​​the evaluation unit, and the patch test results, and is used to characterize the release level of migratory iron in the treatment area. The area of ​​each evaluation unit in the iron migration treatment area is measured. And calculate the amount of iron migration in the treatment area according to the following formula. :

[0052]

[0053] in, The first in the iron relocation treatment area The area of ​​each unit to be evaluated for treatment, in units of ; The amount of iron migrated in the treatment area is expressed in mg. In order to determine the contact time The amount of migratable iron measured by iron migration test patches and converted according to the area of ​​the evaluation unit does not characterize the total iron content in the pavement material; because Characterization and determination of contact time The cumulative amount of migrating iron within the body, therefore, is calculated. No longer divide by The amount of iron migration in the treated area serves as the basis for calculating the amount of iron migration treatment membrane required.

[0054] like Figure 1 In one embodiment shown, the amount of iron migration treatment membrane used is determined based on the amount of iron migration in the area to be treated, the iron treatment capacity per unit mass of the iron migration treatment membrane, and the treatment safety factor. The iron treatment capacity per unit mass... Calculate using the following formula:

[0055]

[0056] in, The initial iron concentration of the iron-containing standard solution is expressed in mg / mL. This represents the initial volume of the iron-containing standard solution, in mL. Contact treatment contact time The residual iron concentration in the subsequent contact solution, expressed in mg / mL; Contact treatment contact time The volume of the liquid in subsequent contact, in mL; The dry mass of the iron migration treatment membrane used in the calibration is expressed in grams. The unit is mg / g; It is determined by averaging no fewer than three parallel calibration results.

[0057] Simultaneously, the capacity of the iron migration treatment film was verified using on-site rust extract or road surface washing solution to obtain the on-site verified capacity. ; The unit mass treatment capacity of the iron migration treatment membrane for migrating iron in the field is expressed in mg / g. satisfy: ; when At that time, the safety factor of treatment Take not less than and not greater than The value; when hour, Take not less than The value; when At that time, the unit mass iron processing capacity was recalibrated. Alternatively, the iron migration treatment membrane may need to be re-prepared, or the on-site capacity verification may need to be repeated.

[0058] like Figure 1 In one embodiment shown, when the surface iron migration intensity obtained after post-treatment verification is still higher than the treatment threshold, the corresponding area is designated as a re-treatment area, and the iron migration amount in that area is measured again, the amount of iron migration treatment film is calculated, and in-situ treatment is performed again. Specifically, when At that time, it will satisfy The verification location is determined as the over-threshold verification location; when the over-threshold verification location is located within the original evaluation unit, the original evaluation unit where the over-threshold verification location is located is determined as the re-treatment unit; when the over-threshold verification location is located within the transition zone or adjacent verification zone, the area centered on the over-threshold verification location, with an area equal to the area of ​​the original evaluation unit and a boundary not exceeding the transition zone or adjacent verification zone, is determined as the re-treatment unit; when two or more re-treatment units share a common boundary, they are merged into a re-treatment area, and the re-treatment area is subjected to quantitative re-treatment according to steps S2 to S6; when and At that time, based on the images before and after treatment after scale correction and spatial registration, the newly added rust connected regions are extracted; the newly added rust connected regions are merged into the original iron migration treatment area to form the re-treatment area, and the iron migration test patches are redeployed and the iron migration amount in the treatment area is recalculated according to steps S2 to S6. Reassess the dry quality of the iron migration treatment film. And then perform quantitative treatment again.

[0059] like Figure 1 In one embodiment shown, when the surface iron migration intensity is not higher than the treatment threshold and the newly added rust area does not exceed the preset area judgment threshold, the iron tailings asphalt surface layer is determined to have met the requirement for inhibiting the continuous development of rust. That is, when and At that time, it was determined that the iron tailings asphalt surface layer met the requirements for inhibiting the continuous development of rust. After the iron migration treatment film was removed, the surface of the treated area was cleaned to ensure that there was no obvious residue of the treatment film adhering to the road surface. Before opening to traffic, the surface of the treated area was confirmed to be dry, and the anti-skid performance was verified by using the pendulum friction coefficient, texture depth, or anti-skid index specified in the project acceptance documents.

[0060] like Figure 1 In one embodiment shown, if the requirement for inhibiting rust development is not met after two consecutive treatments, local milling repair is performed on the corresponding area. Specifically, if the requirement for inhibiting rust development is not met after two consecutive treatments, local milling repair is performed on the corresponding area. Or, if the condition is still met after two consecutive treatments. At that time, local milling repairs will be carried out on areas that still do not meet the standards; areas that still do not meet the standards include: those that meet the requirements. The re-treatment unit where the verification location is located, and / or the newly added rust connected area and its boundary buffer area extending 5cm to 20cm after scale correction and spatial registration.

[0061] In this invention, , , , The units are all mg; , , , , and All units are ; and The units are all in h; , , and All units are ; and All units are mg / g; and The units are all in grams; , , The iron concentration in the on-site verification solution is in mg / mL. , , And the unit of volume for on-site verification is mL; and All are dimensionless coefficients; The unit is g / .

[0062] To verify the treatment effect of the present invention, the following test examples and comparative examples were set up: Experimental Example 1 Yellowish-brown to reddish-brown rust appeared on the asphalt surface layer of an iron tailings mine after service. An area to be treated was selected. Before testing, there was no standing water on the road surface; there was no rainfall during the test; the ambient temperature was 23℃ and the relative humidity was 55%. A fixed shooting bracket was used for image acquisition at a shooting height of 1.2m, with the lens optical axis at a 90° angle to the road surface. A 5500K ring light source was used for supplementary lighting, and a standard color correction board was placed in the image. Image segmentation used the same hue, saturation, and brightness thresholds in the HSV color space. Image segmentation determined the rust-colored area and the transition zone within a 20cm radius outside its boundary. The rust-colored area and the transition zone were divided into 6 evaluation units, each with an area of ​​400 square meters. .

[0063] The iron migration test patch used in this experiment was a cellulose filter membrane-sodium carboxymethyl cellulose-sodium phytate composite patch. The patch size was... Contact area Measure the contact time The iron content measured on the three blank iron migration test patches was 0.006 mg, 0.007 mg, and 0.006 mg, respectively, with an average iron content of... The relative standard deviation of the blank patch was approximately 8.7%. Iron concentration was used. ,volume The iron migration test patches from the same batch were calibrated with iron-containing standard solution. After calibration, the iron content of the iron migration test patches was measured. Iron recovery correction factor .

[0064] Three iron migration test patches from the same batch were placed in a control area with the same asphalt pavement structure and no rust observed. The iron content measured in the three iron migration test patches in the control area were 0.025 mg, 0.027 mg, and 0.026 mg, respectively. The calculation results are as follows:

[0065]

[0066]

[0067] The relative standard deviation of the control patch was approximately 3.8%, and the treatment threshold was:

[0068] The iron content measured on the iron migration test patches in the six evaluation units was 0.122 mg, 0.108 mg, 0.181 mg, 0.024 mg, 0.023 mg, and 0.021 mg, respectively. The iron content was calculated using the same method.

[0069]

[0070]

[0071]

[0072]

[0073]

[0074]

[0075] Evaluation units 1 to 3 satisfy The first to third evaluation units are identified as evaluation units to be treated; the first to third evaluation units share a common boundary and are merged into one iron migration treatment area.

[0076] The area of ​​each of the three evaluation units awaiting treatment is 400. Iron migration in the treatment area Calculate using the following formula:

[0077] The iron migration treatment membrane used in this experiment is composed of a polyvinyl alcohol-sodium alginate-chitosan composite hydrophilic and water-retaining substrate, tannic acid, and sodium phytate, and contains sodium citrate. During preparation, 100 parts of an 8% (w / w) polyvinyl alcohol aqueous solution, 1.5 parts of sodium alginate, 0.8 parts of chitosan lactate, 1.0 part of tannic acid, 2.0 parts of sodium phytate, 0.5 parts of sodium citrate, and 0.8 parts of glycerol were mixed, degassed, cast into a film, and dried to constant weight to obtain an iron migration treatment membrane with a thickness of 0.45 mm to 0.60 mm.

[0078] Two other groups of iron migration treatment membranes were prepared using the same film-forming method. The first group, based on 100 parts by weight of a 6% polyvinyl alcohol aqueous solution, added 0.5 parts sodium alginate, 0.2 parts chitosan lactate, 0.2 parts tannic acid, 0.5 parts sodium phytate, 0.1 parts sodium citrate, and 0.2 parts glycerol, forming a continuous membrane with an iron treatment capacity of 1.18 mg / g. The second group, based on 100 parts by weight of a 10% polyvinyl alcohol aqueous solution, added 3.0 parts sodium alginate, 2.0 parts chitosan lactate, 3.0 parts tannic acid, 5.0 parts sodium phytate, 2.0 parts sodium citrate, and 2.0 parts glycerol, forming a continuous membrane with an iron treatment capacity of 5.42 mg / g.

[0079] Volume calibration was performed using iron migration treatment membranes from the same batch. Initial iron concentration of the iron-containing standard solution. initial volume Treatment contact time Afterwards, the residual iron concentration in the contact liquid ,volume ; Participating in the calibration of iron migration treatment membrane dry quality The unit mass iron processing capacity is:

[0080]

[0081] Loose iron-containing deposits were collected from the surface of the rust-discolored area of ​​the same road section and eluted with deionized water at a mass-to-volume ratio of 1:20 for 30 minutes, followed by filtration to obtain the on-site road surface eluent. The iron migration treatment film from the same batch was then contacted with the on-site road surface eluent for 2 hours, and the on-site validation capacity was measured. To calibrate the volume of iron-containing standard solution 77.4% of the data satisfies the following:

[0082]

[0083] Therefore, the iron removal capacity per unit mass of iron migration treatment membranes in the same batch It can be used to calculate the dry mass of the treatment film in the rust area of ​​the asphalt surface layer of the iron tailings.

[0084] In this experimental example, the on-site verification capacity was demonstrated. Calibration capacity of iron-containing standard solution , Based on the treatment safety factor Not less than The value selection rules are as follows: in this experimental example, we take... Iron migration in the treatment area The required dry mass of the iron migration treatment membrane is: .

[0085] The actual dry mass weighed is The iron migration treatment film is applied to the iron migration treatment area and the treatment contact time is maintained. Then remove it. After removal, clean the road surface; there is no obvious residue of the treatment film adhering to the treated area.

[0086] The surface residue of the treated film was verified using a transparent mesh film covering method. Visible film-like adhesive residue accounted for 0.6% of the treated area, and no continuous film residue was found. The anti-skid performance of the treated area was verified using a pendulum friction meter. The pendulum friction coefficient before treatment was 64 BPN, and after removal and cleaning of the treated film, it was 62 BPN, representing 96.9% of the original value. The texture depth before treatment, measured using the sand-spreading method, was 0.82 mm, and after removal and cleaning, it was 0.80 mm, representing 97.6% of the original value. These results indicate that the removal of the treated film and surface cleaning did not significantly reduce the anti-skid performance of the road surface, meeting the surface verification requirements before opening to traffic.

[0087] After treatment, four iron migration test patches were re-installed in the iron migration treatment area and transition zone. The surface iron migration intensity at each verification location was measured using the same method as before treatment, and the results were as follows:

[0088]

[0089]

[0090]

[0091] therefore:

[0092] Images before and after treatment were taken at the same shooting height, angle, lighting conditions, and color correction chart. Scale correction and spatial registration were performed using evaluation unit boundaries and the color correction chart. Image segmentation used HSV parameters and hue... The saturation ranges from 5° to 35°. ,brightness The value ranges from 0.20 to 0.85. Image segmentation before and after treatment yields the area of ​​newly added rust in the adjacent verification area:

[0093]

[0094] In the control area image, which is the same area as the adjacent verification area, located on the same road segment, and without rust, the mis-segmented area of ​​the control area is obtained using the same image segmentation parameters:

[0095] Minimum recognizable area of ​​the image:

[0096] therefore:

[0097] because and The treatment area was determined to have met the requirements for inhibiting the continued development of rust.

[0098] The treated area was subjected to 5 spray-dry cycles, each time at a dose of 0.20g / Spray water and allow it to dry naturally until there is no standing water on the road surface. After the cycle is repeated, check the results using the same method.

[0099]

[0100]

[0101] Still satisfied and .

[0102] Experimental Example 2 Localized reddish-brown rust stains appeared on the asphalt surface of an iron tailings mine. Following the method in Example 1, the rust-discoloration zone and transition zone were determined and divided into four evaluation units. The contact area of ​​the iron migration test patch was also measured. Measure contact time Blank average iron content Iron recovery correction factor Three iron migration test patches from the same batch were placed in the control area where no rust was observed on the same road section, and the treatment threshold was calculated:

[0103]

[0104] Of the four evaluation units, the first, second, and third evaluation units satisfy the following conditions: These three units were identified as assessment units awaiting treatment. Each of the three assessment units has an area of ​​300 square meters. The iron levels measured on the corresponding iron migration test patches were 0.115 mg, 0.094 mg, and 0.101 mg, respectively. Iron migration in the treated area was calculated using the formula:

[0105]

[0106] calculate.

[0107] Iron treatment capacity per unit mass of iron migration treatment membrane in the same batch Safety factor of treatment ,according to Calculate the required dry mass of the iron migration treatment membrane, and actually weigh out the iron migration treatment membrane that satisfies this relationship for the first treatment. Verify the dry mass after the first treatment. Surface iron migration intensity at each verification location. A comparison was performed one by one, and the second verification position met the requirements. The location was identified as the over-threshold verification location. Since the second verification location was located within the original second evaluation unit, the original second evaluation unit was designated as the re-treatment unit. If the over-threshold verification location was located within the transition zone, then a region centered on this verification location, with an area equal to the area of ​​the original evaluation unit and whose boundaries did not exceed the transition zone, was designated as the re-treatment unit. The iron migration test patch iron content of this re-treatment unit was remeasured, and the iron migration amount in the re-treatment area was recalculated using the following formula:

[0108]

[0109] Then according to The required dry mass of the iron migration treatment film for retreatment was reassessed.

[0110] The measurement was checked again after treatment. New rust area in adjacent review area Not greater than the area determination threshold The area was determined to have met the requirements for inhibiting the continued development of rust. This test example demonstrates that when migratory iron release still occurs after the initial treatment, the present invention can transform the area exceeding the limit into an area for re-treatment, avoiding repeated treatment of areas that have already met the standards.

[0111] Comparative Example 1 In the same iron tailings asphalt surface rust area as in Example 1, a fixed-dose film application method was used for treatment. The amount of iron migration in the treated area was measured according to the method of this invention. Iron treatment capacity per unit mass of iron migration treatment membrane in the same batch On-site verification capacity ,satisfy ;because The present invention takes the treatment safety factor ,according to The calculation should satisfy The comparative example was not conducted according to... Configure the treatment film, apply only the dry weight of the film. Iron migration treatment membrane.

[0112] The iron migration intensity of the treated surface was still higher than that measured after re-examination. Furthermore, the newly added rust area in the adjacent review area exceeds the area determination threshold. The fixed-dose film application method failed to meet the requirements for inhibiting the continued development of rust. This result indicates that undertreatment is likely to occur when the dry weight of the treatment film is not determined based on the amount of iron migration in the treated area, the iron treatment capacity per unit mass, and the treatment safety factor.

[0113] Comparative Example 2 Another iron tailings asphalt surface layer with yellowish-brown rust was selected. The image shows that the area of ​​the rust-covered zone is 0.50. If treatment is based solely on the overall area of ​​rust stains, then the entire 0.50 mm area needs to be treated. For the regional application treatment film, the dry weight of the iron migration treatment film used in the fixed dosage regimen was 3.40g.

[0114] After deploying the iron migration test patches using the method of this invention, it was found that only two evaluation units within the rust coloration area met the requirements. The surface iron migration intensity of the remaining colored areas does not exceed the treatment threshold. According to this invention, only the above two evaluation units are identified as evaluation units to be treated, and they are merged into an iron migration treatment area. The area of ​​this iron migration treatment area is 0.18. ,according to , and The required dry mass of the iron migration-treated membrane was calculated to be 1.26 g. This was verified after treatment. and The results show that the present invention can distinguish between historical residual discolored areas and evaluation units where surface iron migration still exists, thereby reducing unnecessary treatment areas while maintaining treatment effectiveness.

[0115] Comparative Example 3 In the same iron tailings asphalt surface rust area as in Example 1, treatment was performed using tannic acid-free, phytate-free, and citrate-free treatment films, respectively, with the remaining steps identical to Example 1. The tannic acid-free treatment film had a unit mass iron treatment capacity of 2.16 mg / g, and the surface iron migration strength was verified after treatment as follows:

[0116]

[0117] Above the treatment threshold After treatment with a phytate-free membrane, the surface iron migration strength was verified as follows:

[0118]

[0119] However, after five spray-dry cycles, the area of ​​newly added rust in the adjacent inspection area was:

[0120] Above the area determination threshold The area of ​​newly added rust after treatment with a citrate-free treatment film is:

[0121]

[0122] The value was 0.42 higher than that of the citrate-treated membrane in Example 1. The results indicate that tannic acid is mainly used to complex or capture migrating iron ions, phytate is mainly used to improve the stabilization effect on the surface of residual iron-containing deposits and exposed iron tailings particles, and citrate is mainly used to promote the transformation of some colored iron-containing deposits into iron forms that can be complexed or captured by iron-ion-binding components; the three together improve the inhibitory effect of the iron migration treatment film on the continuous development of rust.

[0123] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A method for in-situ quantitative treatment of rust stains on asphalt surfaces of iron tailings, characterized in that, Includes the following steps, S1. Images of the iron tailings asphalt surface layer with rust were acquired to determine the rust-colored area and the surrounding transition area, and evaluation units were divided. S2, iron migration test patches are placed in each of the evaluation units, the surface iron migration intensity of each of the evaluation units is measured, and a treatment threshold is set. S3, define the evaluation unit where the surface iron migration intensity is higher than the treatment threshold as the treatment area and calculate the amount of iron migration in the area; S4, determine the amount of iron migration treatment membrane to be used based on the amount of iron migration in the area to be treated; S5, based on the amount of the iron migration treatment membrane used, the iron migration treatment membrane is applied to the iron migration treatment area for in-situ treatment.

2. The in-situ quantitative treatment method for rust stains on asphalt surfaces of iron tailings according to claim 1, characterized in that: The transition zone is an early warning area formed by extending outward from the boundary of the rust coloring area, used to cover areas that have not yet developed color but pose a risk of migratory iron release.

3. The in-situ quantitative treatment method for rust stains on asphalt surfaces of iron tailings according to claim 1, characterized in that: At least two iron migration test patches are set in the same evaluation unit. During the pre-treatment screening stage, the iron migration test patch with the highest iron content is used as the basis for pre-treatment evaluation.

4. The in-situ quantitative treatment method for rust stains on asphalt surfaces of iron tailings according to claim 3, characterized in that: During the post-treatment review stage, when the relative standard deviation of the iron content measured by each iron migration test patch within the same evaluation unit is not greater than 10%, the average value is taken as the representative iron content; when the relative standard deviation is greater than 10%, the maximum value is taken as the representative iron content.

5. The in-situ quantitative treatment method for rust stains on asphalt surfaces of iron tailings according to claim 1, characterized in that: The treatment threshold is determined based on the iron migration test results of the control area and serves as the basis for determining whether the evaluation unit needs treatment.

6. The in-situ quantitative treatment method for rust stains on asphalt surfaces of iron tailings according to claim 1, characterized in that: The amount of iron migration in the area to be treated is calculated based on the surface iron migration intensity of the evaluation unit, the area of ​​the evaluation unit, and the patch test results, and is used to characterize the release level of migratory iron in the area to be treated.

7. The in-situ quantitative treatment method for rust stains on asphalt surfaces of iron tailings according to claim 1, characterized in that: The amount of iron migration treatment membrane used is determined based on the amount of iron migration in the area to be treated, the iron treatment capacity per unit mass of the iron migration treatment membrane, and the treatment safety factor.

8. The in-situ quantitative treatment method for rust stains on asphalt surfaces of iron tailings according to claim 1, characterized in that: It also includes step S6, after the treatment is completed, the surface iron migration intensity is re-measured, and the treatment effect is checked in conjunction with the newly added rust area to verify whether it meets the standard; when the surface iron migration intensity obtained after the treatment is still higher than the treatment threshold, the corresponding area is determined as the area to be treated again, and the iron migration amount in the area, the amount of iron migration treatment film used, and the in-situ treatment are re-measured.

9. The in-situ quantitative treatment method for rust stains on asphalt surfaces of iron tailings according to claim 8, characterized in that: When the surface iron migration intensity of the reviewed iron tailings is not higher than the treatment threshold and the area of ​​newly added rust does not exceed the preset area judgment threshold, the treatment effect of the iron tailings asphalt surface layer is judged to meet the standard.

10. The in-situ quantitative treatment method for rust stains on asphalt surfaces of iron tailings according to claim 8, characterized in that: If the treatment effect is still not satisfactory after two consecutive treatments, milling repair should be carried out on the corresponding area.

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