Method and device for measuring chloride ion content distribution in concrete components of bridge piers

Abstract

The present invention discloses a method and device for measuring the distribution of chloride ion content in a bridge pier concrete component, wherein the method comprises: obtaining a first pier concrete and performing pretreatment to obtain a second pier concrete; designing sampling points on the second pier concrete; determining the sampling volume according to the maximum particle size of the selected coarse aggregate; determining the sampling width according to the outer diameter of the grinding head; determining the sampling length according to the height of the first pier concrete; calculating the sampling depth according to the sampling volume, the sampling height and the sampling length; radially grinding at the sampling point according to the sampling parameters to obtain a concrete sample; measuring the chloride ion content of the sample; calculating the sample coordinates according to the sampling parameters and the sampling points; processing the sample coordinates and the chloride ion content of the sample to obtain a distribution diagram of the chloride ion content in the first pier concrete. This improves the reliability of the measurement of the chloride ion distribution content in the pier concrete. The present invention can be widely used in the field of measuring the chloride ion distribution content in pier concrete components.

Description

Technical Field

[0001] The invention relates to the field of measuring chloride ion content distribution, in particular to a method and a device for measuring chloride ion content distribution in a bridge pier concrete component. Background Art

[0002] Due to frequent contact with seawater, the concrete components of cross-sea bridge piers will suffer from severe chloride ion corrosion. Obtaining accurate distribution of chloride ion content is the basis for conducting durability assessment of pier concrete structures under marine environment. The cross-sections of cross-sea bridge pier components are mostly rectangular and circular, and the boundary conditions are different for different geometric shapes. Therefore, the diffusion law of chloride ions in circular cross-section pier concrete is significantly different from that in rectangular cross-section. Studies have shown that the diffusion law of chloride ions in circular cross-section pier concrete is between the one-dimensional diffusion law and the two-dimensional diffusion law. At present, the measurement method of radial core sampling along the circular pipe pile can measure the one-dimensional distribution law of chloride ions in pier concrete, but this method cannot obtain the distribution law of chloride ions on the entire circular cross-section. However, the drilling sampling method is used to obtain the chloride ion diffusion law in the rectangular cross-section pier concrete. When extracting samples using the drilling sampling method, a certain distance must be reserved between the boreholes, and the integrity of the samples in the target area cannot be guaranteed; on the other hand, the relationship between the sampling volume of the pier concrete and the characteristic parameters of the aggregate has not been established. The obtained chloride ion distribution law is easily affected by the non-uniform distribution of the aggregate, and the chloride ion content in the same radial direction shows significant discreteness; therefore, directly applying the above-mentioned drilling sampling method to the circular cross-sea bridge pier concrete components will directly affect the reliability of the chloride ion distribution law in the cross-sea bridge pier concrete components. Summary of the invention

[0003] In view of this, an embodiment of the present invention provides a method and device for measuring the distribution of chloride ion content in a bridge pier concrete member, so as to improve the reliability of measuring the distribution content of chloride ions in the pier concrete member.

[0004] One aspect of the present invention provides a method for measuring the distribution of chloride ion content in a bridge pier column concrete member, characterized in that it includes: obtaining a first pier column concrete and pre-treating it to obtain a second pier column concrete; designing sampling points on the second pier column concrete; determining a sampling volume according to the maximum particle size of the coarse aggregate selected for the first pier column concrete; determining a sampling width according to the outer diameter of a grinding head, wherein the grinding head is used to sample the second pier column concrete; determining a sampling length according to the height of the first pier column concrete, wherein the sampling length is less than or equal to the height of the first pier column concrete; calculating a sampling depth according to the sampling width, the sampling length, and the sampling volume; radially grinding and sampling the second pier column concrete at the sampling point according to sampling parameters to obtain a concrete sample, wherein the sampling parameters include: sampling volume, sampling width, sampling length, sampling depth, and sampling layer number; measuring the sample chloride ion content of the concrete sample; calculating the sample coordinates of the concrete sample according to the sampling parameters and the sampling points; processing the sample coordinates and the sample chloride ion content to obtain a distribution diagram of the chloride ion content in the first pier column concrete.

[0005] According to some embodiments of the present invention, the step of obtaining the first column concrete and pre-treating it to obtain the second column concrete includes: obtaining the first column concrete and drying it; and grinding the crystallized salt on the surface of the first column concrete to obtain the second column concrete.

[0006] According to some embodiments of the present invention, the designing of sampling points on the second pier column concrete includes: designing sampling points at equal or unequal intervals around the circumference of the second pier column concrete.

[0007] According to some embodiments of the present invention, the calculation formula for determining the sampling volume includes: V = 66.579e 0.1418d Wherein, V is the sampling volume; d is the maximum particle size of the coarse aggregate in the concrete of the first pier column.

[0008] According to some embodiments of the present invention, the sampling depth is obtained by calculating according to the sampling width, the sampling length, and the sampling volume, including obtaining a first product by multiplying the sampling width and the sampling length, and obtaining the sampling depth by dividing the value of the sampling volume by the first product;

[0009] According to some embodiments of the present invention, the sample coordinates of the concrete sample are obtained by calculation according to the sampling parameters and the sampling points, including: the calculation formula of the horizontal coordinate of the sample coordinates is: in, is the horizontal coordinate of the sample coordinate; is the ordinate of the sample coordinates; R is the cross-sectional radius of the first pier column concrete; n is the number of sampling layers of the concrete sample; a is the sampling width; b is the sampling length; θ is the sampling point angle; and m is the serial number of the sampling point.

[0010] According to some embodiments of the present invention, measuring the sample chloride ion content of the concrete sample includes: determining the sample chloride ion content of the concrete sample by using a boiling and then standing immersion method and a potentiometric automatic titration method.

[0011] According to some embodiments of the present invention, the measuring of sample chloride ion content of concrete samples includes: weighing a fixed amount of concrete powder from each concrete sample, passing the concrete powder through a sieve with a fixed sieve aperture to obtain a powder sample; washing the powder sample with pure ethanol and soaking it for a fixed time; removing the powder sample from the pure ethanol by suction filtration, and placing it in a vacuum drying oven for drying; boiling the powder sample and then letting it stand and soak to obtain a filtrate containing chloride ions; using a potentiometric automatic titration device to determine the acid-soluble chloride ion content in the filtrate; and dividing the acid-soluble chloride ion content by the mass of the concrete powder to obtain the sample chloride ion content.

[0012] According to some embodiments of the present invention, the processing of the sample coordinates and the sample chloride ion content to obtain the chloride ion content distribution map in the first pier column concrete includes connecting the sample chloride ion contents on the sample coordinates through contour lines to obtain the chloride ion content distribution map in the first pier column concrete.

[0013] Another aspect of the present invention provides a device for measuring the distribution of chloride ion content in a bridge pier concrete member, comprising: a first module for obtaining a first pier concrete and pre-treating it to obtain a second pier concrete; a second module for designing a sampling point for the second pier concrete; a third module for determining a sampling volume according to the maximum particle size of a coarse aggregate selected for the first pier concrete; a fourth module for determining a sampling width according to an outer diameter of a grinding head, wherein the grinding head is used to sample the second pier concrete; a fifth module for determining a sampling length according to a height of the first pier concrete; and a sixth module for obtaining the product of the sampling width and the sampling length to obtain a first product, dividing the value of the sampling volume by the first product to obtain a sampling depth; a seventh module, for radially grinding and sampling the second pier concrete at the sampling point according to sampling parameters to obtain a concrete sample, wherein the sampling parameters include: sampling volume, sampling width, sampling length, sampling depth and number of sampling layers; an eighth module, for measuring the sample chloride ion content of the concrete sample; a ninth module, for calculating according to the sampling parameters and the sampling point to obtain the sample coordinates of the concrete sample; a tenth module, for processing the sample coordinates and the sample chloride ion content to obtain a distribution map of the chloride ion content in the first pier concrete.

[0014] Another aspect of the present invention provides an electronic device, comprising a processor and a memory; the memory is used to store a program; the processor executes the program to implement any of the methods described above for measuring the distribution of chloride ion content in concrete components of bridge piers.

[0015] The electronic device according to the embodiment of the present invention has at least the same beneficial effect as the above-mentioned method for measuring the distribution of chloride ion content in the concrete component of a bridge pier.

[0016] Another aspect of the present invention provides a computer-readable storage medium storing a program, wherein the program is executed by a processor to implement any of the methods described above for measuring the distribution of chloride ion content in a concrete member of a bridge pier.

[0017] The computer-readable storage medium according to the embodiment of the present invention has at least the same beneficial effect as the above-mentioned method for measuring the distribution of chloride ion content in the concrete component of a bridge pier.

[0018] The embodiment of the present invention also discloses a computer program product or a computer program, which includes a computer instruction stored in a computer-readable storage medium. A processor of a computer device can read the computer instruction from the computer-readable storage medium, and the processor executes the computer instruction, so that the computer device executes the above method.

[0019] The embodiment of the present invention pre-treats the first pier concrete and designs sampling parameters, grinds and samples the first pier concrete according to the sampling parameters to obtain a concrete sample, and measures the chloride ion content of the concrete sample, thereby determining the distribution of the chloride ion content in the first pier concrete. Through this method, the target area in the pier concrete component can be continuously sampled, effectively ensuring the integrity of the sample, overcoming the technical defect of discontinuous samples in the drilling sampling method, and when designing the sampling volume in the sampling parameters, the sampling volume is calculated according to the maximum particle size of the coarse aggregate, thereby establishing a relationship between the sampling volume of the pier concrete and the characteristic parameters of the aggregate, reducing the influence of the non-uniform distribution of the aggregate on the obtained chloride ion distribution diagram, thereby improving the reliability of the measurement of the chloride ion distribution content in the pier concrete component. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0021] Figure 1 is a flow chart of steps of a method for measuring the distribution of chloride ion content in a concrete member of a bridge pier provided by an embodiment of the present invention;

[0022] Figure 2 It is a schematic diagram of the layout of sampling points for bridge pier concrete components in a specific embodiment of the present invention.

[0023] Figure 3 It is a distribution diagram of chloride ion content in the concrete component of the bridge pier in a specific embodiment of the present invention.

[0024] Figure 4 It is a sampling schematic diagram of the drilling sampling method in the prior art.

[0025] Figure 5 is the chloride ion content distribution curve measured in the specific embodiment of the present invention and Figure 4 Comparison of the chloride ion content distribution curves determined by the borehole sampling method.

[0026] Figure 6 It is a schematic diagram of the layout of sampling points of bridge pier components in another specific embodiment of the present invention.

[0027] Figure 7 It is a distribution cloud diagram of water-soluble chloride ion content of bridge pier components in another specific embodiment of the present invention.

[0028] Figure 8It is a schematic block diagram of a device for measuring the distribution of chloride ion content in a concrete member of a bridge pier provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0029] In order to make the purpose, technical solution and advantages of the present application more clearly understood, the present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0030] Reference Figure 1 , the method of the embodiment of the present invention includes:

[0031] Step S100, obtaining first column concrete and pre-processing it to obtain second column concrete.

[0032] Specifically, the first pier concrete is dried and the crystallized salt on the surface is polished off to obtain the second pier concrete.

[0033] Step S200, designing sampling points on the second pier column concrete.

[0034] Specifically, the sampling points are arranged at equal intervals or unequal intervals in the circumferential direction of the concrete component.

[0035] Step S300, determining the sampling volume according to the maximum particle size of the coarse aggregate selected for the first pier column concrete.

[0036] Step S400, determining a sampling width according to an outer diameter of a grinding head, wherein the grinding head is used to sample the second pier column concrete;

[0037] Step S500, determining the sampling length according to the height of the first pier column concrete;

[0038] Step S600, calculating the sampling depth according to the sampling width, the sampling length, and the sampling volume.

[0039] Specifically, the minimum sampling volume is determined according to the maximum particle size of the coarse aggregate. When the sampling volume is too small, it will affect the test of the chloride ion content. Therefore, the sampling volume is determined according to the maximum particle size of the coarse aggregate. The calculation formula for determining the sampling volume includes: V = 66.579e 0.1418d ,

[0040] Where V is the sampling volume in mm 3; d is the maximum particle size of coarse aggregate in the concrete of the first pier column, in mm. Through this method, a quantitative calculation formula for the sampling volume with respect to the maximum particle size of aggregate is established, which eliminates the influence of non-uniform distribution of aggregate on the test results of chloride ion content in concrete, and lays the foundation for accurately obtaining the distribution law of chloride ion content in the concrete components of cross-sea bridge piers. The sampling width is the width of the sampling groove. It should be noted that the grinding head grinds and samples the concrete of the second pier column in the area of ​​the sampling groove, and samples according to a certain path during the sampling process. Therefore, when determining the sampling width, the sampling width is greater than or equal to the outer diameter of the grinding head. The sampling length is determined according to the height of the concrete of the first pier column. It should be noted that the sampling height is less than or equal to the height of the concrete of the first pier column, and is specifically selected according to experience or needs. The sampling width and the sampling length are multiplied to obtain the first product, and the value of the sampling volume is divided by the value of the first product to obtain the value of the sampling depth. The sampling depth determines the accuracy of sampling at each layer.

[0041] Step S700, according to sampling parameters, radial grinding sampling is performed on the second pier column concrete at the sampling point to obtain a concrete sample, wherein the sampling parameters include: sampling volume, sampling width, sampling length, sampling depth and number of sampling layers.

[0042] Specifically, for different sampling points, radial layer-by-layer grinding sampling is performed according to the designed sampling parameters. The grinding sampling method can continuously sample the target area in the concrete component, effectively ensuring the integrity of the sample and overcoming the technical defect of discontinuous samples in the drilling sampling method. It is understandable that the sampling head can be an electroplated diamond grinding head with a hollow structure.

[0043] Step S800, measuring the chloride ion content of the concrete sample.

[0044] Specifically, the chloride ion content of the concrete samples at each sampling point is determined by using the method of standing and immersing after boiling and the method of potentiometric automatic titration. The specific operations are: weighing a fixed amount of concrete powder from each concrete sample, passing the concrete powder through a sieve with a fixed mesh size to obtain a powder sample; washing the powder sample with pure ethanol and soaking it for a fixed time. It is understandable that this fixed time can be obtained based on experience; taking out the powder sample from the pure ethanol by filtration, and placing it in a vacuum drying oven for drying; boiling the powder sample and then standing and soaking it to obtain a filtrate containing chloride ions; using a potentiometric automatic titration device to determine the acid-soluble chloride ion content in the filtrate; dividing the acid-soluble chloride ion content by the mass of the concrete powder to obtain the chloride ion content of the sample.

[0045] Step S900, calculating and obtaining the sample coordinates of the concrete sample according to the sampling parameters and the sampling points;

[0046] Step S1000, processing the sample coordinates and the sample chloride ion content to obtain a distribution diagram of the chloride ion content in the first pier column concrete.

[0047] Specifically, the sample coordinate calculation formula is:

[0048]

[0049] in, is the horizontal coordinate of the sample; is the ordinate of the sample; R is the cross-sectional radius of the circular cross-section bridge pier concrete component, in mm; n is the number of sample layers; a is the sampling width, in mm; b is the sampling length, in mm; θ is the sampling point angle, in °; and m is the sampling point number. Combined with the sample coordinates and sample chloride ion content corresponding to the concrete sample, the distribution map of chloride ion content in the bridge pier concrete component is drawn based on the contour calculation method. A general calculation formula for sampling sample coordinates suitable for circular cross-section bridge pier concrete components is established. Combined with the contour calculation method, the distribution law of chloride ion content in circular cross-section bridge pier concrete components can be accurately obtained. It should be noted that the two ends of the pier are usually closed, so chloride ions usually invade from the circumferential curved surface of the pier, so the chloride ion distribution map obtained is a two-dimensional distribution map of chloride ion content in the bridge pier concrete component.

[0050] The following are specific embodiments:

[0051] Embodiment 1:

[0052] Example 1 is one of the specific embodiments of the present invention.

[0053] Three bridge pier concrete components with a water-cement ratio of 0.5 were formed, the maximum aggregate size was 25 mm, and the component size was φ140×150 mm. After standard curing for 7 days, the upper and lower bottom surfaces were sealed with epoxy resin, and then continued to be cured for 28 days. After the curing, the bridge pier concrete components were exposed to the water change zone of the marine environment for 2 years. The bridge pier concrete components were taken out from the seawater, and the two-dimensional distribution of the chloride ion content in the bridge pier concrete components was tested using the present invention. The following steps are included:

[0054] (1) Pretreatment of concrete components: Wipe the surface of the bridge pier concrete component dry and put it into an oven with the oven temperature controlled at about 60°C. After 24 hours, take out the bridge pier concrete component and grind off the crystallized salt on the side of the component;

[0055] (2) Sampling parameter design: i) Sampling point layout: 24 sampling points were arranged around the circumference of the bridge pier concrete components at intervals of 15°, such as Figure 2ii) Determine the sampling volume: Substitute the maximum particle size of the coarse aggregate used in concrete, 25 mm, into the sampling volume calculation formula to determine the sampling volume of a single concrete sample to be 2.5 cm 3 ;iii) Determine the length and width of the sampling: the outer diameter of the grinding head is 18mm, so the sampling width is 25mm, the height of the concrete component is 150mm, and the sampling length is 50mm;iv) Determine the sampling depth: divide the sampling volume of a single concrete sample by the product of the sampling width and the sampling length, and the sampling depth is 2mm;v) Determine the number of sampling layers: based on experience, the number of sampling layers is determined to be 15 layers;

[0056] (3) Radial layer-by-layer grinding sampling: i) Grinding operation: align the center of the grinding head with the first sampling point, and grind and mill grooves along the radial direction of the cylinder. The width, length and depth of the grooves are equal to 25 mm, 50 mm and 2 mm respectively; ii) Sampling operation: use a sampling spoon to collect the powder sample in the first groove of the concrete component; iii) Layer-by-layer grinding sampling: repeat the above grinding and sampling operations, and then grind the next layer of samples until 15 layers of samples at the first sampling point are completed; iv) Grinding sampling of each sampling point one by one: align the center of the grinding head with the second sampling point, and complete the sampling of 15 layers of samples at the second sampling point according to the above steps i) to iii), and repeat the above process until the grinding sampling of the 24th sampling point is completed;

[0057] (4) Determination of chloride ion content: 6 g of concrete powder was weighed from each sample and passed through a 0.315 sieve. The powder was then washed and soaked in pure ethanol (ethanol content ≥ 95%) for 24 hours to stop cement hydration. The powder sample was filtered out and dried in a vacuum drying oven at 60°C for later use. A chloride ion extraction method was used in which the filtrate of the concrete powder sample containing chloride ions was obtained by boiling and then standing for 24 hours. The acid-soluble chloride ion content in the filtrate was determined using a potentiometric automatic titration device. The chloride ion content was then divided by the mass of the concrete powder weighed from each sample to calculate the chloride ion content corresponding to each sample.

[0058] (5) Determine the distribution of chloride ion content in bridge pier concrete components: Determine the coordinates of the first layer of the first sampling point according to the sample coordinate calculation formula

[0059]

[0060] Coordinates of the second layer samples

[0061]

[0062] Similarly, the coordinates of the remaining 13 samples from the 3rd to the 15th layers of the first sampling point are determined in turn; the same method is used to determine the coordinates of all samples of the 15 layers of samples from the 2nd to the 24th sampling points, and the distribution map of the chloride ion content in the concrete components of the bridge pier is drawn based on the contour calculation method in combination with the chloride ion content test values ​​of each sample, as shown in the figure: Figure 3 shown.

[0063] In order to verify the superiority of the method of the present invention, the existing drilling sampling method is described below for concrete sampling, and the chloride ion content test results thereof are measured and compared with the content test results in Example 1:

[0064] The parallel samples of the circular cross-section pier concrete member in Example 1 were cut to make two cylinders A and B of equal height, with a size of φ140×75 mm. One cylinder A was selected, and drilling sampling was performed along the radial direction on its cut surface. Referring to the drilling sampling parameters in the article "Modelling of two-dimensional chloride diffusion concentrations considering the heterogeneity of concrete materials" (Construction and Building Materials, 2020, Vol. 243, pp. 1-15), the drill bit diameter was 3 mm, the drilling depth was 30 mm, and the diffusion depths along the chloride ion diffusion direction were 5 mm, 10 mm, 15 mm, 20 mm, 25 mm and 30 mm, respectively. Figure 4 As shown, the chloride ion content of each drill hole sample was tested and was 0.75%, 0.84%, 0.49%, 0.51%, 0.54% and 0.28% respectively.

[0065] Another cylinder B was selected as a comparison, and the concrete sampling method in Example 1 was used to Figure 4 Powder sampling was carried out layer by layer in the middle shaded area. The diffusion depths of the samples from the 1st to the 15th layer were 1mm, 3mm, 5mm, 7mm, 9mm, 11mm, 13mm, 15mm, 17mm, 19mm, 21mm, 23mm, 25mm, 27mm and 29mm respectively. The chloride ion content of each layer of samples was 1.05%, 0.95%, 0.92%, 0.81%, 0.73%, 0.69%, 0.64%, 0.57%, 0.52%, 0.50%, 0.42%, 0.38%, 0.33%, 0.24% and 0.25% respectively.

[0066] The chloride ion content distribution curve obtained by drilling sampling and the chloride ion content distribution curve obtained by the method of the present invention are respectively drawn, as shown in FIG. Figure 5 shown.

[0067] By comparison, the distribution curve of chloride ion content measured in Example 1 is smooth, and its law conforms to Fick's second law, while the distribution curve of chloride ion content measured by the common method shows obvious fluctuation characteristics, and its law roughly conforms to Fick's second law; this is mainly because the volume of the samples in Example 1 is 2.5 cm 3 The ratio of coarse aggregate content to cement mortar content in the sample is basically constant, while the volume of the sample in the existing method is 0.2 cm 3 The ratio of coarse aggregate content to cement mortar content in the sample fluctuates greatly. It is very likely that the sample is entirely coarse aggregate or entirely cement mortar, resulting in abnormally small or abnormally large chloride ion content in the sample. From the above analysis, it can be seen that the present method can eliminate the influence of coarse aggregate, and has the advantage of accurately testing the distribution law of chloride ion content in concrete, which reflects the superiority of the method of the present invention.

[0068] Embodiment 2:

[0069] Embodiment 2 is another specific embodiment of the present invention.

[0070] This embodiment is to test the distribution of chloride ion content in the concrete components of a cross-sea bridge pier that has been in service for 56 years. The cross-sea bridge is located in a coastal city. The pier is exposed to the splash zone of the marine environment. The cross-section of the pier is circular, with a diameter of 1600mm and a protective layer thickness of 60mm. Testing the distribution of chloride ion content in the pier components includes the following steps:

[0071] (1) Pretreatment of concrete components: Dry the surface of the concrete components and grind off the crystallized salt on the side of the cylinder;

[0072] (2) Sampling parameter design: i) Sampling point layout: 36 sampling points were arranged around the circumference of the concrete component at intervals of 10°, e.g. Figure 6 ii) Determine the sampling volume: Substitute the maximum particle size of the coarse aggregate used in concrete, 31.5 mm, into the sampling volume calculation formula to determine the sampling volume of a single concrete sample to be 6 cm 3 ;iii) Determine the length and width of the sampling: the outer diameter of the grinding head is 18mm, so the sampling width is 20mm and the sampling length is 50mm;iv) Determine the sampling depth: divide the sampling volume of a single concrete sample by the product of the sampling width and the sampling length, and the sampling depth is 6mm;v) Determine the number of sampling layers: based on experience, the number of sampling layers is determined to be 10;

[0073] (3) Radial layer-by-layer grinding sampling: i) Grinding operation: align the center of the grinding head with the first sampling point, and grind and mill grooves along the radial direction of the cylinder. The width, length and depth of the grooves are equal to 20 mm, 50 mm and 6 mm respectively; ii) Sampling operation: use a sampling spoon to collect the powder sample in the first groove of the cylindrical component; iii) Layer-by-layer grinding sampling: repeat the above grinding and sampling operations, and then grind the next layer of samples until 10 layers of samples at the first sampling point are completed; iv) Complete the grinding sampling of each sampling point one by one: align the center of the grinding head with the second sampling point, and complete the sampling of 10 layers of samples at the second sampling point according to the above steps i) to iii), and repeat the above process until the grinding sampling of the 36th sampling point is completed. Figure 6 As shown;

[0074] (4) Determination of chloride ion content: 15 g of concrete powder was weighed from each sample and passed through a 0.315 sieve, then washed with pure ethanol (ethanol content ≥ 95%) and soaked for 24 hours to stop cement hydration; the powder sample was filtered out and placed in a vacuum drying oven at 60°C for drying for later use; a chloride ion extraction method was used in which the filtrate of the concrete powder sample containing chloride ions was obtained by boiling and then standing for 24 hours, and the water-soluble chloride ion content in the filtrate was determined by a potentiometric automatic titration device, and then the chloride ion content was divided by the mass of the concrete powder weighed from each sample to calculate the chloride ion content corresponding to each sample;

[0075] (5) Determine the distribution of chloride ion content in bridge pier concrete components: Determine the coordinates of the first layer of the first sampling point according to the sample coordinate calculation formula

[0076]

[0077] Coordinates of the second layer samples

[0078]

[0079] Similarly, the coordinates of the remaining 7 samples from the 3rd to the 10th layers of the first sampling point are determined in turn; the same method is used to determine the coordinates of all samples of the 10 layers of samples from the 2nd to the 36th sampling points, and the distribution map of the chloride ion content in the concrete components of the bridge pier column is drawn based on the contour calculation method in combination with the chloride ion content test values ​​of each sample, as shown in the figure: Figure 7 shown.

[0080] Depend on Figure 7 It can be seen that the chloride ion content in the concrete in the upper right corner of the pier is relatively high, indicating that the chloride ion erosion in the upper right corner of the pier is serious. This is mainly because under the influence of wind direction and wind force, the upper right corner of the pier component is more significantly affected by wave splashes, which accelerates the transport of chloride ions in the concrete.

[0081] On the one hand, referring to Figure 8 This embodiment provides a device for measuring the distribution of chloride ion content in a bridge pier concrete component, which includes at least: a first module 810, a second module 820, a third module 830, a fourth module 840, a fifth module 850, a sixth module 860, a seventh module 870, an eighth module 880, a ninth module 890, and a tenth module 8100.

[0082] Specifically, the first module 810 is used to pre-treat the first pier column concrete to obtain the second pier column concrete; the second module 820 is connected to the first module 810 to obtain the second pier column concrete output by the first module 810, and to design the sampling point of the second pier column concrete; the third module 830 is connected to the first module 810 to determine the sampling volume according to the maximum particle size of the coarse aggregate selected for the first pier column concrete; the fourth module 840 is connected to the first module 810 to determine the sampling width according to the outer diameter of the grinding head; the fifth module 850 is connected to the first module 810 to determine the sampling length according to the height of the first pier column concrete; the sixth module 860 is connected to the third module 830, the fourth module 840, and the fifth module 850 to determine the sampling length according to the sampling width, sampling length, and sampling volume The seventh module 870 is connected to the sixth module 860 and the second module 820 to obtain the sampling parameters in the sixth module 860 and the sampling points in the second module 820, and radial grinding sampling is performed on the second pier concrete at the sampling points according to the sampling parameters to obtain a concrete sample; the eighth module 880 is connected to the seventh module 870 to measure the concrete sample to obtain the chloride ion content of the sample; the ninth module 890 is connected to the seventh module 870 to calculate the sample coordinates of the concrete sample according to the sampling parameters and sampling points of the seventh module 870; the tenth module 8100 is connected to the eighth module 880 and the ninth module 890 to obtain a distribution diagram of the chloride ion content in the first pier concrete according to the chloride ion content and the sample coordinates of the sample.

[0083] The embodiment of the present invention also discloses a computer program product or a computer program, wherein the computer program product or the computer program includes a computer instruction, and the computer instruction is stored in a computer-readable storage medium. A processor of a computer device can read the computer instruction from the computer-readable storage medium, and the processor executes the computer instruction, so that the computer device executes Figure 1 The method shown.

[0084] In some selectable embodiments, the function / operation mentioned in the block diagram may not occur in the order mentioned in the operation diagram. For example, depending on the function / operation involved, the two boxes shown in succession can actually be executed substantially simultaneously or the boxes can sometimes be executed in reverse order. In addition, the embodiment presented and described in the flow chart of the present invention is provided by way of example, for the purpose of providing a more comprehensive understanding of technology. The disclosed method is not limited to the operation and logic flow presented herein. Selectable embodiments are expected, wherein the order of various operations is changed and the sub-operation of a part for which is described as a larger operation is performed independently.

[0085] In addition, although the present invention is described in the context of functional modules, it should be understood that, unless otherwise specified, one or more of the functions and / or features described may be integrated into a single physical device and / or software module, or one or more functions and / or features may be implemented in separate physical devices or software modules. It is also understood that a detailed discussion of the actual implementation of each module is unnecessary for understanding the present invention. More specifically, in view of the properties, functions, and internal relationships of the various functional modules in the device disclosed herein, the actual implementation of the module will be understood within the conventional skills of the engineer. Therefore, those skilled in the art can implement the present invention set forth in the claims without excessive experimentation using ordinary techniques. It is also understood that the specific concepts disclosed are merely illustrative and are not intended to limit the scope of the present invention, which is determined by the full scope of the appended claims and their equivalents.

[0086] If the functions are implemented in the form of software functional units and sold or used as independent products, they can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present invention, or the part that contributes to the prior art or the part of the technical solution, can be embodied in the form of a software product. The computer software product is stored in a storage medium, including several instructions for enabling a computer device (which can be a personal computer, a server, or a network device, etc.) to perform all or part of the steps of the methods described in each embodiment of the present invention. The aforementioned storage medium includes: various media that can store program codes, such as a USB flash drive, a mobile hard disk, a read-only memory (ROM), a random access memory (RAM), a magnetic disk or an optical disk.

[0087] The logic and / or steps represented in the flowchart or otherwise described herein, for example, can be considered as an ordered list of executable instructions for implementing logical functions, and can be embodied in any computer-readable medium for use by an instruction execution system, device or apparatus (such as a computer-based system, a system including a processor, or other system that can fetch instructions from an instruction execution system, device or apparatus and execute instructions), or in conjunction with such instruction execution systems, devices or apparatuses. For the purposes of this specification, "computer-readable medium" can be any device that can contain, store, communicate, propagate or transmit a program for use by an instruction execution system, device or apparatus, or in conjunction with such instruction execution systems, devices or apparatuses.

[0088] More specific examples of computer-readable media (a non-exhaustive list) include the following: an electrical connection with one or more wires (electronic device), a portable computer disk case (magnetic device), a random access memory (RAM), a read-only memory (ROM), an erasable and programmable read-only memory (EPROM or flash memory), an optical fiber device, and a portable compact disk read-only memory (CDROM). In addition, the computer-readable medium may even be a paper or other suitable medium on which the program is printed, since the program may be obtained electronically, for example, by optically scanning the paper or other medium, followed by editing, deciphering or, if necessary, processing in another suitable manner, and then stored in a computer memory.

[0089] It should be understood that the various parts of the present invention can be implemented by hardware, software, firmware or a combination thereof. In the above-mentioned embodiments, a plurality of steps or methods can be implemented by software or firmware stored in a memory and executed by a suitable instruction execution system. For example, if implemented by hardware, as in another embodiment, it can be implemented by any one of the following technologies known in the art or their combination: a discrete logic circuit having a logic gate circuit for implementing a logic function for a data signal, a dedicated integrated circuit having a suitable combination of logic gate circuits, a programmable gate array (PGA), a field programmable gate array (FPGA), etc.

[0090] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0091] Although the embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.

[0092] The above is a specific description of the preferred implementation of the present invention, but the present invention is not limited to the described embodiments. Those skilled in the art may make various equivalent modifications or substitutions without violating the spirit of the present invention. These equivalent modifications or substitutions are all included in the scope defined by the claims of this application.

Claims

1. A method for measuring the distribution of chloride ion content in a bridge pier concrete member, characterized in that: include: Obtaining the first pier column concrete and pre-treating it to obtain the second pier column concrete; Design sampling points on the concrete of the second pier; Determine the sampling volume according to the maximum particle size of the coarse aggregate selected for the concrete of the first pier column; Determine the sampling width according to the outer diameter of the grinding head, wherein the grinding head is used to sample the concrete of the second pier column; Determine a sampling length according to the height of the first pier column concrete, wherein the sampling length is less than or equal to the height of the first pier column concrete; The sampling depth is obtained by calculation according to the sampling width, the sampling length and the sampling volume; According to sampling parameters, radial grinding sampling is performed on the second pier concrete at the sampling point to obtain a concrete sample, wherein the sampling parameters include: sampling volume, sampling width, sampling length, sampling depth and number of sampling layers; measuring a sample chloride ion content of the concrete sample; Calculating the sample coordinates of the concrete sample according to the sampling parameters and the sampling points; Processing the sample coordinates and the sample chloride ion content to obtain a distribution diagram of chloride ion content in the first pier column concrete; The calculation formula for determining the sampling volume includes: in, is the sampling volume; is the maximum particle size of the coarse aggregate in the concrete of the first pier.

2. A method for measuring the distribution of chloride ion content in a bridge pier concrete member according to claim 1, characterized in that: The method of obtaining the first pier column concrete and pre-processing the first pier column concrete to obtain the second pier column concrete includes: Obtaining the first pier column concrete and drying it; The crystallized salt on the surface of the first column concrete is ground to obtain the second column concrete.

3. A method for measuring the distribution of chloride ion content in a bridge pier concrete member according to claim 1, characterized in that: The design of sampling points on the second pier concrete includes: Sampling points are designed at equal or unequal intervals around the circumference of the second pier concrete.

4. A method for measuring the distribution of chloride ion content in a bridge pier concrete member according to claim 1, characterized in that: The sampling depth is obtained by calculating according to the sampling width, the sampling length, and the sampling volume, including: The product of the sampling width and the sampling length is obtained to obtain a first product, and the value of the sampling volume is divided by the first product to obtain a sampling depth.

5. The method for measuring the distribution of chloride ion content in a bridge pier concrete member according to claim 1, characterized in that: The step of calculating the sample coordinates of the concrete sample according to the sampling parameters and the sampling points includes: The calculation formula of the horizontal coordinate of the sample coordinate is: ， ， in, is the horizontal coordinate of the sample coordinate; is the ordinate of the sample coordinate; is the cross-sectional radius of the concrete of the first pier column; n is the number of sampling layers of the concrete sample; is the sampling width; b is the sampling length; is the sampling point angle; m is the serial number of the sampling point.

6. A method for measuring the distribution of chloride ion content in a bridge pier concrete member according to claim 1, characterized in that: The step of measuring the chloride ion content of the concrete sample comprises: The chloride ion content of the concrete sample is determined by using a boiling and then standing immersion method and a potentiometric automatic titration method.

7. A method for measuring the distribution of chloride ion content in a bridge pier concrete member according to claim 6, characterized in that: The step of measuring the chloride ion content of the concrete sample comprises: Weighing a fixed amount of concrete powder from each concrete sample, and passing the concrete powder through a sieve with a fixed mesh size to obtain a powder sample; The powder sample is washed and soaked for a fixed period of time by pure ethanol; The powder sample is taken out from the pure ethanol by suction filtration and placed in a vacuum drying oven for drying; The powder sample is boiled and then allowed to stand and soak to obtain a filtrate containing chloride ions; The acid-soluble chloride ion content in the filtrate was determined using a potentiometric automatic titration device; The chloride ion content of the sample was obtained by dividing the acid-soluble chloride ion content by the mass of the concrete powder.

8. A method for measuring the distribution of chloride ion content in a bridge pier concrete member according to claim 1, characterized in that: The processing of the sample coordinates and the sample chloride ion content to obtain a distribution diagram of the chloride ion content in the first pier column concrete includes: The chloride ion content of the samples on the sample coordinates is connected by isolines to obtain a distribution diagram of the chloride ion content in the first pier column concrete.

9. A device for measuring the distribution of chloride ion content in concrete components of bridge piers, characterized in that: include: The first module is used to obtain the first pier column concrete and perform pretreatment to obtain the second pier column concrete; The second module is used to design the sampling points of the second pier concrete; The third module is used to determine the sampling volume according to the maximum particle size of the coarse aggregate selected for the concrete of the first pier column; A fourth module is used to determine a sampling width according to an outer diameter of a grinding head, wherein the grinding head is used to sample the second pier column concrete; A fifth module is used to determine the sampling length according to the height of the first pier column concrete; A sixth module is used to obtain the product of the sampling width and the sampling length to obtain a first product, and divide the value of the sampling volume by the first product to obtain a sampling depth; The seventh module is used to perform radial grinding sampling on the second pier concrete at the sampling point to obtain a concrete sample according to sampling parameters, wherein the sampling parameters include: sampling volume, sampling width, sampling length, sampling depth and number of sampling layers; An eighth module is used to measure the sample chloride ion content of the concrete sample; A ninth module is used to calculate the sample coordinates of the concrete sample according to the sampling parameters and the sampling points; A tenth module is used to process the sample coordinates and the sample chloride ion content to obtain a distribution map of the chloride ion content in the first pier column concrete; Wherein, the calculation formula for determining the sampling volume includes: in, is the sampling volume; is the maximum particle size of the coarse aggregate in the concrete of the first pier.

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