Construction methods for large-area cast-in-place concrete slope protection on steep banks with large water level differences

Abstract

This invention discloses a method for constructing large-area cast-in-place concrete slope protection on steep banks with large water level differences. The method includes the preparation of fluorescent aggregates, the preparation of magnetic cement, concrete pouring, monitoring equipment and data acquisition, visualization, quality defect determination, and supplementary vibration. By introducing fluorescent aggregates and magnetic cement as tracers, and combining them with ultraviolet-excited fluorescence imaging and magnetic field induction monitoring technology, this invention achieves, for the first time, real-time, non-contact acquisition of aggregate and cement paste distribution data within the concrete during pouring and vibration. This overcomes the significant limitation of existing technologies that cannot acquire internal uniformity data in real time before concrete solidification, transforming post-construction inspection into process monitoring, effectively improving the stability of construction quality and construction efficiency.

Description

Technical Field

[0001] This invention relates to the field of hydraulic structure concrete technology, and in particular to a method for constructing large-area cast-in-place concrete slope protection on steep banks with large water level differences. Background Technology

[0002] Constructing port projects in mountainous river areas often faces unfavorable conditions such as large water level differences and steep bank slopes. The slope protection structures in port projects are typically constructed using large-area cast-in-place concrete to resist water erosion and bank instability, thereby ensuring the safety of hydraulic structures. For large-area cast-in-place concrete slope protection with large water level differences and steep banks, the traditional construction method mainly involves: after the formwork is assembled on-site, the concrete is transported by concrete mixer trucks and chutes, then manually vibrated to ensure compaction, and the quality of the finished concrete is assessed after 28 days using methods such as acoustic testing and core sampling.

[0003] Under the combined adverse effects of large water level differences and steep banks, traditional construction methods face challenges in controlling concrete segregation. The reasons include: 1) Under its own weight, coarse aggregates in concrete are prone to flowing and segregating down steep banks, making it difficult to meet requirements for uniformity and density; 2) Vibration operations are limited on steep banks, and the difficulty in stabilizing mechanical vibration equipment and vertically inserting vibrators often results in poor concrete vibration quality; 3) The large water level differences in mountain rivers necessitate rapid concrete pouring during low water levels, making it difficult to meet requirements for slump and vibration duration. Furthermore, when concrete is submerged during high water levels, water erosion can cause the uncured aggregates to shift.

[0004] The conventional remedy for concrete segregation is to locate the poorly constructed areas of concrete using testing methods, locally remove them, and then re-pour the concrete. However, existing testing methods are all reactive and cannot identify the risk of segregation in real time during pouring, thus making it impossible to remedy the situation by adding vibration before the concrete sets.

[0005] Concrete segregation is a common phenomenon that affects structural quality. However, due to its complex composition, varying mix proportions, and diverse construction environments, a unified, simple, and widely accepted quantitative evaluation index is still lacking. The "Standard for Test Methods of Performance of Ordinary Concrete Mixtures" (GB / T 50080-2016) proposes a segregation rate for concrete mixtures based on anti-segregation performance tests. SR However, this indicator relies on indoor tests and cannot be remedied by supplementing vibration before the concrete sets. Furthermore, this indicator cannot directly reflect the uniformity of aggregate or cement paste distribution.

[0006] In summary, existing technologies lack methods for obtaining real-time, non-contact data on the uniformity of aggregate and cement paste distribution within concrete under conditions of large water level differences and steep bank slopes. They also fail to establish reasonable segregation indexes to identify the risk of concrete segregation, resulting in the inability to take remedial measures before concrete solidification. Consequently, construction quality becomes unstable, costs are high, and efficiency is low. Summary of the Invention

[0007] To address the shortcomings of existing technologies, this invention proposes a method for constructing large-area cast-in-place concrete slope protection on steep banks with large water level differences. By acquiring data on the uniformity of aggregate and cement paste distribution within the concrete in real time and without contact, the method identifies the risks of concrete segregation and insufficient density, thereby improving the construction quality, economy, and efficiency.

[0008] Construction method for large-area cast-in-place concrete slope protection on steep banks with large water level differences includes the following steps: S1. Preparation of fluorescent aggregate: Fluorescent tracer material and water-based binder are mixed at a mass ratio of 1:5 to 1:8 and stirred evenly to form a fluorescent coating liquid. Surface impurities of concrete aggregate are removed and dried. Then, the fluorescent coating liquid is sprayed evenly and completely onto the surface of the concrete aggregate using a spraying method, and dried in an environment of 30°C to 40°C for 2 to 3 hours to ensure that the fluorescent coating liquid firmly adheres to the surface of the concrete aggregate, forming fluorescent aggregate with uniformly distributed fluorescence intensity. S2. Preparation of magnetic cement: The magnetic tracer material and cement are thoroughly mixed at a mass ratio of 1:50 to 1:100 to ensure that the magnetic tracer material is evenly distributed and does not agglomerate, thereby forming magnetic cement with uniform magnetic permeability. S3, Concrete pouring: After completing the clearing of the steep slope, anchor bolt installation, formwork installation and construction area division, the concrete pouring raw materials, including the fluorescent aggregate and the magnetic cement, are mixed according to the design mix ratio. Then, the concrete is poured in sections by a combination of pumping and chute. The initial vibration is carried out immediately after the pouring process of each construction area is completed. S4. Monitoring equipment and data acquisition: After the initial vibration, a monitoring device is used to monitor the current area in real time. The monitoring device includes an ultraviolet excitation light source, a fluorescence imaging device, an excitation coil, and a magnetic induction intensity sensor. The monitoring device is controlled by a synchronous time-stamp signal to ensure the spatiotemporal consistency of the monitoring data. The ultraviolet excitation light source emits 365nm ultraviolet light into the concrete in the construction area, thereby exciting the fluorescent aggregate to emit fluorescence. The fluorescence imaging device records the fluorescence intensity distribution of the fluorescent aggregate. L (x , y , z The excitation coil applies an alternating magnetic field to the concrete in the construction area, causing the magnetic cement to generate a secondary magnetic field. The magnetic induction intensity sensor records the magnetic induction intensity distribution of the secondary magnetic field. B ( x , y , z ); S5. Visual Implementation: Will L ( x , y , z )and B ( x , y , z The data are imported into a data visualization platform to generate fluorescence intensity heatmaps and magnetic induction intensity heatmaps, thereby visually displaying the distribution of the fluorescent aggregate and the magnetic cement in the concrete. A higher fluorescence intensity value in the fluorescence intensity heatmap indicates a denser distribution of the fluorescent aggregate, and a higher magnetic induction intensity value in the magnetic induction intensity heatmap indicates a denser distribution of the magnetic cement. The generation of the fluorescence intensity heatmap and the magnetic induction intensity heatmap includes the following steps: S501, Data Normalization Process: ... L ( x , y , z )and B ( x , y , z Normalization is performed separately, as shown in the following expressions:

[0009] in, M ( x , y , z ), N ( x , y , z ) are respectively L ( x , y , z ), B ( x , y , z The data after normalization, and M ( x , y , z )and N (x , y , z The values ​​of ) are all in the range of [0, 1]; L ( x , y , z ) max and L ( x , y , z ) min They are respectively L ( x , y , z The maximum and minimum values ​​of ) B ( x , y , z ) max and B ( x , y , z ) min They are respectively B ( x , y , z The maximum and minimum values ​​of (). S502, Color Marking: According to M ( x , y , z )and N ( x , y , z The value of ) assigns a color label to each pixel on the heatmap: M ( x , y , z )=0、 N ( x , y , z Pixels with a value of 0 are marked in purple; 0 < M ( x , y , z ) ≤0.1, 0 < N ( x , y , z Pixels with a value ≤0.1 are marked in blue; 0.1 < M ( x , y , z≤0.5, 0.1< N ( x , y , z Pixels with a value ≤0.5 are marked in yellow; 0.5 < M ( x , y , z ) ≤1, 0.5< N ( x , y , z Pixels with a value ≤1 are marked in red; S503, Construction Area Mapping: A three-dimensional model of the slope protection structure is created based on the engineering design documents, and then... M ( x , y , z )and N ( x , y , z Each pixel is mapped and rendered onto the corresponding coordinates of the 3D model of the slope protection structure, forming a fluorescence intensity heatmap and a magnetic induction intensity heatmap. S6. Quality Defect Judgment: Based on the distribution of the fluorescent aggregate and the magnetic cement in the concrete, concrete segregation is classified into aggregate-enriched segregation and cement paste-enriched segregation, and the segregation status is then determined. Specifically, aggregate-enriched segregation is classified according to aggregate-enriched segregation indices. I m The judgment is made as shown in the following expression:

[0010] in, M i ( x , y , z ) is the first i points M ( x , y , z )value, M ave ( x , y , z )for M ( x , y , z The average value of ) n for M ( x , y ,z The total number of points, [ I m [Indicators for aggregate enrichment segregation] I m The threshold value is determined according to industry standards; I m The range of values ​​is [0,1]. As... I m As the value increases, the uniformity of the fluorescent aggregate in the concrete deteriorates, and when... I m ≥[ I m When the aggregate is concentrated, it is determined that there is a risk of aggregate enrichment segregation, that is, coarse aggregate accumulation leads to slurry separation; Cement paste enrichment segregation is based on cement paste enrichment segregation index. I n The judgment is made as shown in the following expression:

[0011] in, N i ( x , y , z ) is the first i points N ( x , y , z )value, N ave ( x , y , z )for N ( x , y , z The average value of ) n for N ( x , y , z The total number of points, [ I n [Indicators for aggregate enrichment segregation] I n The threshold value is determined according to industry standards; I n The range of values ​​is [0,1]. As... I n As the value increases, the uniformity of the fluorescent aggregate in the concrete deteriorates, and when... I n ≥[ I nWhen the risk of cement paste enrichment segregation is identified, it is determined that there is a risk of cement paste aggregation, that is, local cement paste aggregation caused by cement paste floating or aggregate settling. S7. Supplementary vibration: Once the risk of aggregate-enriched segregation or cement paste-enriched segregation is determined, a supplementary vibration process is initiated. For aggregate-enriched segregation, high-frequency vibration is used to promote the uniform distribution of the fluorescent aggregates, with the vibrator inserted to a depth of 2 / 3 to 3 / 4 of the concrete thickness to ensure that the vibration energy reaches the aggregate-enriched area. For cement paste-enriched segregation, low-frequency vibration is used to promote the full diffusion of the cement paste, with the vibrator inserted to a depth of 1 / 2 to 2 / 3 of the concrete thickness, and over-vibration should be avoided to prevent further floating of the paste. After the supplementary vibration is completed, steps S4 to S6 are repeated. I m <[ I m ]and I n <[ I n If the risk of concrete segregation is eliminated, then repeat the above steps to ensure that the requirements are met.

[0012] Preferably, in step S1, the fluorescent tracer material is a rare earth-doped aluminate phosphor that is resistant to cement alkali and high temperature, with a fluorescence wavelength range of 500 to 600 nm, and exhibits excellent stability in the alkaline environment after cement hydration reaction.

[0013] Preferably, in step S2, the magnetic tracer material uses iron oxide particles with a particle size range of 50 nm to 500 nm, a saturation magnetization intensity of not less than 50 emu / g, and does not react with cement hydration products; during stirring and mixing, an external DC magnetic field is applied to cause the magnetic tracer material to be directionally magnetized along the direction of the magnetic field, thereby improving the uniformity of the magnetic permeability of the magnetic cement.

[0014] Compared with existing technologies, the beneficial effects of this invention are: it proposes a construction method for large-area cast-in-place concrete slope protection on steep banks with large water level differences, including the preparation of fluorescent aggregates, the preparation of magnetic cement, concrete pouring, monitoring equipment and data acquisition, visualization, quality defect judgment, and supplementary vibration; by introducing fluorescent aggregates and magnetic cement as tracers, and in conjunction with ultraviolet-excited fluorescence imaging and magnetic field induction monitoring technology, it achieves for the first time the real-time, non-contact acquisition of aggregate and cement paste distribution data inside the concrete during concrete pouring and vibration, overcoming the major defect of existing technologies that cannot obtain internal uniformity data in real time before concrete solidification, transforming post-event detection into process monitoring, and providing the possibility for timely intervention; based on the internal structure of the concrete... The data on aggregate and cement paste distribution are used to generate heat maps, which intuitively and clearly show the distribution density of aggregate and cement paste in concrete, helping construction personnel to quickly locate abnormal areas. Based on the degree of variation of fluorescence intensity data and magnetic induction intensity data, aggregate enrichment segregation index and cement paste enrichment segregation index are established to scientifically and quantitatively determine the degree and specific type of segregation risk, solving the problem of the lack of unified, simple and widely accepted quantitative evaluation indicators in existing technologies. Based on real-time monitoring data and segregation index judgment results, corresponding remedial measures can be taken according to the segregation type before concrete solidification, avoiding the need for post-concrete removal and re-pouring in existing technologies, effectively improving the stability of construction quality, reducing rework costs and improving construction efficiency. Attached Figure Description

[0015] Figure 1 This is a flowchart illustrating the construction method for large-area cast-in-place concrete slope protection on steep banks with large water level differences, as shown in an embodiment of the present invention. Figure 2 This is a flow diagram of data monitoring and processing as shown in an embodiment of the present invention; Figure reference numerals: 1-Monitoring equipment, 11-Ultraviolet excitation source, 12-Fluorescence imaging equipment, 13-Excitation coil, 14-Magnetic induction intensity sensor. Detailed Implementation

[0016] The embodiments of the present invention will be described in more detail below with reference to the accompanying drawings and reference numerals, so that those skilled in the art can implement them after reading this specification. It should be understood that the specific embodiments described herein are only for explaining the present invention and are not intended to limit the present invention.

[0017] This application discloses, as follows: Figure 1-2 The method for constructing large-area cast-in-place concrete slope protection on steep banks with large water level differences, as shown, includes the following steps: S1. Preparation of fluorescent aggregate: Fluorescent tracer material and aqueous binder are mixed at a mass ratio of 1:5 to 1:8, and stirred evenly to form a fluorescent coating liquid. Surface impurities of the concrete aggregate are removed and dried. Then, the fluorescent coating liquid is sprayed evenly and completely onto the surface of the concrete aggregate using a spray method, and dried in an environment of 30°C to 40°C for 2 to 3 hours to ensure the fluorescent coating liquid firmly adheres to the surface of the concrete aggregate, forming fluorescent aggregate with uniformly distributed fluorescence intensity. Specifically, the fluorescent tracer material is selected from rare-earth-doped aluminate phosphors that are resistant to cement alkali and high temperatures, with a fluorescence wavelength range of 500 to 600 nm. It exhibits excellent stability in the alkaline environment after cement hydration, maintaining fluorescence performance for a long time and avoiding tracer failure due to chemical corrosion. The aqueous binder is a polyvinyl acetate emulsion with strong affinity to the aggregate surface. At a mass ratio of 1:5 to 1:8, it ensures coating adhesion without affecting interfacial bonding due to excessive binder.

[0018] S2. Preparation of magnetic cement: The magnetic tracer material is thoroughly mixed with cement at a mass ratio of 1:50 to 1:100 to ensure that the magnetic tracer material is uniformly distributed and does not agglomerate, thereby forming magnetic cement with uniform magnetic permeability. In specific implementation, the magnetic tracer material uses iron oxide particles with a particle size range of 50nm to 500nm and a saturation magnetization intensity of not less than 50 emu / g to ensure that it can generate a detectable secondary magnetic field in an alternating magnetic field and does not react with cement hydration products, thus avoiding affecting the normal hydration of cement and the mechanical properties of concrete. During the mixing process, an external DC magnetic field is applied to orient the magnetic tracer material along the direction of the magnetic field, reducing random agglomeration, improving the uniformity of magnetic permeability, and ensuring that the magnetic induction intensity distribution can truly reflect the slurry distribution density of the magnetic cement.

[0019] S3, Concrete pouring: After completing the clearing of the steep slope, anchor bolt installation, formwork installation, and construction area division, the concrete pouring materials, including the fluorescent aggregate and magnetic cement, are mixed according to the design mix ratio. Then, the concrete is poured in sections by a combination of pumping and chute. The initial vibration is carried out immediately after the pouring process of each construction area is completed. In specific implementation, the initial vibration uses an immersion vibrator inserted to a depth of 50mm above the bottom of the formwork to ensure the initial compaction of the concrete and provide a relatively stable benchmark state for subsequent monitoring.

[0020] S4. Monitoring equipment and data acquisition: After the initial vibration, monitoring device 1 is used to monitor the current area in real time. Monitoring device 1 includes an ultraviolet excitation light source 11, a fluorescence imaging device 12, an excitation coil 13, and a magnetic induction intensity sensor 14. Monitoring device 1 is controlled by a synchronous time-stamp signal to ensure the spatiotemporal consistency of the monitoring data. The ultraviolet excitation light source 11 emits ultraviolet light with a wavelength of 365nm into the concrete of the construction area, thereby exciting the fluorescent aggregate to emit fluorescence. The fluorescence imaging device 12 records the fluorescence intensity distribution of the fluorescent aggregate. L ( x , y , z The excitation coil 13 applies an alternating magnetic field to the concrete in the construction area, causing the magnetic cement to generate a secondary magnetic field. The magnetic induction intensity sensor 14 records the magnetic induction intensity distribution of the secondary magnetic field. B ( x , y , z ).

[0021] S5. Visual Implementation: Will L ( x , y , z )and B ( x , y , z The data are imported into a data visualization platform to generate fluorescence intensity heatmaps and magnetic induction intensity heatmaps, thereby visually displaying the distribution of the fluorescent aggregate and the magnetic cement in the concrete. A higher fluorescence intensity value in the fluorescence intensity heatmap indicates a denser distribution of the fluorescent aggregate, and a higher magnetic induction intensity value in the magnetic induction intensity heatmap indicates a denser distribution of the magnetic cement. The generation of the fluorescence intensity heatmap and the magnetic induction intensity heatmap includes the following steps: S501, Data Normalization Process: ... L ( x , y , z )and B ( x , y , z Normalization is performed separately, as shown in the following expressions: (1) in, M ( x , y , z ), N ( x , y , z ) are respectivelyL ( x , y , z ), B ( x , y , z The data after normalization, and M ( x , y , z )and N ( x , y , z The values ​​of ) are all in the range of [0, 1]; L ( x , y , z ) max and L ( x , y , z ) min They are respectively L ( x , y , z The maximum and minimum values ​​of ) B ( x , y , z ) max and B ( x , y , z ) min They are respectively B ( x , y , z The maximum and minimum values ​​of (). S502, Color Marking: According to M ( x , y , z )and N ( x , y , z The value of ) assigns a color label to each pixel on the heatmap: M ( x , y , z )=0、 N ( x , y , z Pixels with a value of 0 are marked in purple; 0 < M (x , y , z ) ≤0.1, 0 < N ( x , y , z Pixels with a value ≤0.1 are marked in blue; 0.1 < M ( x , y , z ≤0.5, 0.1< N ( x , y , z Pixels with a value ≤0.5 are marked in yellow; 0.5 < M ( x , y , z ) ≤1, 0.5< N ( x , y , z Pixels with a value ≤1 are marked in red; S503, Construction Area Mapping: A three-dimensional model of the slope protection structure is created based on the engineering design documents, and then... M ( x , y , z )and N ( x , y , z Each pixel is mapped and rendered onto the corresponding coordinates of the 3D model of the slope protection structure, forming a fluorescence intensity heat map and a magnetic induction intensity heat map. After the heat map is generated, it can be scaled and rotated through a data visualization platform, allowing construction personnel to quickly locate areas that may be at risk of segregation.

[0022] S6. Quality Defect Judgment: Based on the distribution of the fluorescent aggregate and the magnetic cement in the concrete, concrete segregation is classified into aggregate-enriched segregation and cement paste-enriched segregation. The segregation status is then determined. Aggregate-enriched segregation is characterized by localized aggregate accumulation and insufficient cement paste, easily leading to uneven structural strength. Cement paste-enriched segregation is characterized by localized cement paste aggregation and sparse aggregate, easily leading to shrinkage cracks. Aggregate-enriched segregation is further classified according to the aggregate-enriched segregation index. I m The judgment is made as shown in the following expression: (2) in, M i (x , y , z ) is the first i points M ( x , y , z )value, M ave ( x , y , z )for M ( x , y , z The average value of ) n for M ( x , y , z The total number of points, [ I m [Indicators for aggregate enrichment segregation] I m The threshold is determined according to industry standards, and in practice, it is set to 0.1. I m The range of values ​​is [0,1]. As... I m As the value increases, the uniformity of the fluorescent aggregate in the concrete deteriorates, and when... I m ≥[ I m When the aggregate is concentrated, it is determined that there is a risk of aggregate enrichment segregation, that is, coarse aggregate accumulation leads to slurry separation; Cement paste enrichment segregation is based on cement paste enrichment segregation index. I n The judgment is made as shown in the following expression: (3) in, N i ( x , y , z ) is the first i points N ( x , y , z )value, N ave ( x , y , z )for N ( x , y , z The average value of ) n forN ( x , y , z The total number of points, [ I n [Indicators for aggregate enrichment segregation] I n The threshold is determined according to industry standards, and in practice, it is set to 0.1. I n The range of values ​​is [0,1]. As... I n As the value increases, the uniformity of the fluorescent aggregate in the concrete deteriorates, and when... I n ≥[ I n When the cement paste is enriched, it is determined that there is a risk of segregation, that is, local cement paste aggregation caused by the floating of cement paste or the sinking of aggregate.

[0023] S7. Supplementary vibration: When the risk of aggregate-enriched segregation or cement paste-enriched segregation is determined, a supplementary vibration process is initiated. For aggregate-enriched segregation, high-frequency vibration is used to promote the uniform distribution of the fluorescent aggregate. The vibrator is inserted to a depth of 2 / 3 to 3 / 4 of the concrete thickness. High-frequency vibration disperses the accumulated aggregate, with a vibration frequency of 50-100Hz, promoting the filling of gaps by the cement paste. For cement paste-enriched segregation, low-frequency vibration is used to promote the full diffusion of the cement paste, with a vibration frequency of 10-30Hz. The vibrator is inserted to a depth of 1 / 2 to 2 / 3 of the concrete thickness to prevent further floating of the cement paste due to high-frequency vibration, while promoting the diffusion of the paste into areas with sparse aggregate. After the supplementary vibration is completed, steps S4 to S6 are repeated. I m <[ I m ]and I n <[ I n If the risk of concrete segregation is eliminated, then repeat the above steps to ensure that the requirements are met.

[0024] Therefore, by introducing fluorescent aggregates and magnetic cement as tracers, and combining them with ultraviolet-excited fluorescence imaging and magnetic field induction monitoring technology, it is the first time that real-time, non-contact data on the distribution of aggregates and cement paste inside concrete can be obtained during concrete pouring and vibration. This overcomes the major deficiency of existing technologies that cannot obtain real-time data on internal uniformity before concrete solidification, transforming post-construction detection into process monitoring and providing the possibility for timely intervention. Furthermore, a heat map is generated based on the distribution data of aggregates and cement paste inside the concrete, intuitively and clearly displaying the distribution density of aggregates and cement paste in the concrete, aiding in construction... Workers can quickly locate abnormal areas; based on the degree of variation in fluorescence intensity data and magnetic induction intensity data, aggregate-enriched segregation indices and cement paste-enriched segregation indices were established to scientifically and quantitatively determine the degree and specific type of segregation risk, solving the problem of the lack of unified, simple, and widely accepted quantitative evaluation indicators in existing technologies; based on real-time monitoring data and segregation index determination results, corresponding remedial measures can be taken according to the segregation type before concrete solidification, avoiding the need for post-concrete removal and re-pouring in existing technologies, effectively improving the stability of construction quality, reducing rework costs, and increasing construction efficiency.

[0025] The above describes one or more embodiments of the present invention in a relatively specific and detailed manner, but it should not be construed as limiting the scope of the present invention. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these all fall within the protection scope of the present invention. Therefore, the protection scope of this patent should be determined by the appended claims.

Claims

1. A method for constructing large-area cast-in-place concrete slope protection on steep banks with large water level differences, characterized in that: Includes the following steps: S1. Preparation of fluorescent aggregate: Fluorescent tracer material and water-based binder are mixed at a mass ratio of 1:5 to 1:8 and stirred evenly to form a fluorescent coating liquid; surface impurities of concrete aggregate are removed and dried, and then the fluorescent coating liquid is sprayed evenly and completely onto the surface of the concrete aggregate using a spraying method, and dried in an environment of 30°C to 40°C for 2 to 3 hours to make the fluorescent coating liquid firmly adhere to the surface of the concrete aggregate, forming fluorescent aggregate with uniformly distributed fluorescence intensity; S2. Preparation of magnetic cement: The magnetic tracer material and cement are thoroughly mixed at a mass ratio of 1:50 to 1:100 to ensure that the magnetic tracer material is evenly distributed and does not agglomerate, thereby forming magnetic cement with uniform magnetic permeability. S3. Concrete pouring: After completing the clearing of the steep slope, anchor bolt installation, formwork installation and construction area division, the concrete pouring raw materials, including the fluorescent aggregate and the magnetic cement, are mixed according to the design mix ratio. Then, the concrete is poured in sections by a combination of pumping and chute. The initial vibration is carried out immediately after the pouring process of each construction area is completed. S4. Monitoring Equipment and Data Acquisition: After the initial vibration, monitoring equipment is used to monitor the current area in real time. The monitoring equipment includes an ultraviolet excitation light source, a fluorescence imaging device, an excitation coil, and a magnetic induction intensity sensor. The monitoring equipment is controlled by a synchronous time-marking signal to ensure the spatiotemporal consistency of the monitoring data. The ultraviolet excitation light source emits ultraviolet light with a wavelength of 365nm into the concrete in the construction area, thereby exciting the fluorescent aggregate to emit fluorescence. The fluorescence imaging device records the fluorescence intensity distribution of the fluorescent aggregate. L ( x , y , z The excitation coil applies an alternating magnetic field to the concrete in the construction area, causing the magnetic cement to generate a secondary magnetic field. The magnetic induction intensity sensor records the magnetic induction intensity distribution of the secondary magnetic field. B ( x , y , z ); S5, Visual Implementation: [This will be...] L ( x , y , z )and B ( x , y , z Import the data into a data visualization platform to generate a fluorescence intensity heatmap and a magnetic induction intensity heatmap. A higher fluorescence intensity value in the fluorescence intensity heatmap indicates a denser distribution of the fluorescent aggregate, and a higher magnetic induction intensity value in the magnetic induction intensity heatmap indicates a denser distribution of the magnetic cement. The generation of the fluorescence intensity heatmap and the magnetic induction intensity heatmap includes the following steps: S501, Data Normalization Process: ... L ( x , y , z )and B ( x , y , z Normalization is performed separately, as shown in the following expressions: in, M ( x , y , z ), N ( x , y , z ) are respectively L ( x , y , z ), B ( x , y , z The data after normalization, and M ( x , y , z )and N ( x , y , z The values ​​of ) are all in the range of [0, 1]; L ( x , y , z ) max and L ( x , y , z ) min They are respectively L ( x , y , z The maximum and minimum values ​​of ) B ( x , y , z ) max and B ( x , y , z ) min They are respectively B ( x , y , z The maximum and minimum values ​​of (). S502, Color Marking: According to M ( x , y , z )and N ( x , y , z The value of ) assigns a color label to each pixel on the heatmap: M ( x , y , z )=0、 N ( x , y , z Pixels with a value of 0 are marked in purple; 0 < M ( x , y , z ) ≤0.1, 0 < N ( x , y , z Pixels with a value ≤0.1 are marked in blue; 0.1 < M ( x , y , z ≤0.5, 0.1< N ( x , y , z Pixels with a value ≤0.5 are marked in yellow; 0.5 < M ( x , y , z ) ≤1, 0.5< N ( x , y , z Pixels with a value ≤1 are marked in red; S503, Construction Area Mapping: A three-dimensional model of the slope protection structure is created based on the engineering design documents, and then... M ( x , y , z )and N ( x , y , z Each pixel is mapped and rendered onto the corresponding coordinates of the 3D model of the slope protection structure, forming a fluorescence intensity heatmap and a magnetic induction intensity heatmap. S6. Quality Defect Judgment: Based on the distribution of the fluorescent aggregate and the magnetic cement in the concrete, concrete segregation is classified into aggregate-enriched segregation and cement paste-enriched segregation, and the segregation status is then determined. Specifically, aggregate-enriched segregation is classified according to aggregate-enriched segregation indices. I m The judgment is made as shown in the following expression: in, M i ( x , y , z ) is the first i points M ( x , y , z )value, M ave ( x , y , z )for M ( x , y , z The average value of ) n for M ( x , y , z The total number of points, [ I m [Indicators for aggregate enrichment segregation] I m The threshold value is determined according to industry standards; I m The range of its value is [0,1], and as... I m As the value increases, the uniformity of the fluorescent aggregate in the concrete deteriorates, and when... I m ≥[ I m When the aggregate is concentrated, it is determined that there is a risk of aggregate enrichment segregation, that is, coarse aggregate accumulation leads to slurry separation; Cement paste enrichment segregation is based on cement paste enrichment segregation index. I n The judgment is made as shown in the following expression: in, N i ( x , y , z ) is the first i points N ( x , y , z )value, N ave ( x , y , z )for N ( x , y , z The average value of ) n for N ( x , y , z The total number of points, [ I n [Indicators for aggregate enrichment segregation] I n The threshold value is determined according to industry standards; I n The range of its value is [0,1], and as... I n As the value increases, the uniformity of the fluorescent aggregate in the concrete deteriorates, and when... I n ≥[ I n When the risk of cement paste enrichment segregation is identified, it is determined that there is a risk of cement paste aggregation, that is, local cement paste aggregation caused by cement paste floating or aggregate settling. S7. Supplementary Vibration: When the risk of aggregate-rich segregation or cement paste-rich segregation is determined, a supplementary vibration process is initiated. For aggregate-rich segregation, high-frequency vibration is used to promote the uniform distribution of the fluorescent aggregates. The vibrator is inserted to a depth of 2 / 3 to 3 / 4 of the concrete thickness to ensure that the vibration energy reaches the aggregate-rich area. For cement paste-rich segregation, low-frequency vibration is used to promote the full diffusion of the cement paste. The vibrator is inserted to a depth of 1 / 2 to 2 / 3 of the concrete thickness, and over-vibration should be avoided to prevent further floating of the paste. After the supplementary vibration is completed, steps S4 to S6 are repeated. I m <[ I m ]and I n <[ I n If the risk of concrete segregation is eliminated, then repeat the above steps to ensure that the requirements are met.

2. The construction method for large-area cast-in-place concrete slope protection on steep banks with large water level differences according to claim 1, characterized in that, In step S1, the fluorescent tracer material is a rare earth-doped aluminate phosphor that is resistant to cement alkali and high temperature, with a fluorescence wavelength range of 500 to 600 nm, and excellent stability in the alkaline environment after cement hydration reaction.

3. The construction method for large-area cast-in-place concrete slope protection on steep banks with large water level differences according to claim 1, characterized in that, In step S2, the magnetic tracer material uses iron oxide particles with a particle size range of 50 nm to 500 nm, a saturation magnetization intensity of not less than 50 emu / g, and does not react with cement hydration products. During the mixing of the magnetic cement, an external DC magnetic field is applied to cause the magnetic tracer material to be directionally magnetized along the direction of the magnetic field, thereby improving the uniformity of the magnetic permeability of the magnetic cement.

Images