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

Abstract

The present invention discloses a method and device for measuring the chloride ion content distribution in a bridge cap concrete member. The method includes: obtaining the first bridge cap concrete and performing pretreatment to obtain the second bridge cap concrete; calculating and determining the sampling volume according to the maximum particle size of the coarse aggregate in the first bridge cap concrete; radially cutting, circumferentially cutting, and vertically cutting the second bridge cap concrete according to the sampling parameters to obtain sampling units; performing powder grinding and sampling on the sampling units to obtain target samples; measuring the chloride ion content of the target samples; calculating according to the radius of the first bridge cap concrete and the sampling parameters to obtain the sample coordinates of the target samples in the first bridge cap concrete; processing the sample chloride ion content and the sample coordinates according to the isosurface to obtain the chloride ion content distribution map, so as to improve the reliability of measuring the chloride ion distribution content in the bridge cap concrete. The present invention can be widely applied to the field of measuring the chloride ion distribution content in bridge cap concrete members.

Description

Technical Field

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

[0002] Most of the caps of cross-sea bridges are located in the underwater area and the water level fluctuation area. Therefore, the sides and tops of the caps will be simultaneously severely corroded by chloride ions. Obtaining an accurate chloride ion content distribution law is the basis for carrying out the durability assessment of concrete structures. The geometric shapes of cap members are mostly cylinders and cuboids. Different geometric shapes have different boundary conditions, and the diffusion law of chloride ions in cylindrical concrete is significantly different from that in cuboid concrete. Currently, the commonly used method for measuring concrete is mostly drilling and sampling. However, a certain spacing must be left when drilling holes, which will result in discontinuous sampling and cause a large error in the subsequent results of the chloride ion content distribution. In addition, the coarse aggregate used to construct the cap is non-uniformly distributed, which also affects the chloride ion distribution law to a certain extent. Therefore, large errors often occur in the chloride ion distribution law obtained in the cap concrete structure. Summary of the Invention

[0003] In view of this, embodiments of the present invention provide a method and device for measuring the chloride ion content distribution in a concrete member of a bridge cap to improve the reliability of measuring the chloride ion distribution content in the cap concrete member.

[0004] One aspect of the present invention provides a method for measuring the chloride ion content distribution in a concrete member of a bridge cap, including:

[0005] Obtaining first cap concrete and performing pretreatment to obtain second cap concrete; obtaining the coarse aggregate in the first cap concrete, calculating and determining the sampling volume according to the maximum particle size of the coarse aggregate; radially dividing, circumferentially dividing, and vertically dividing the second cap concrete according to sampling parameters to obtain sampling units, where the sampling parameters include: sampling volume, sampling angle, sampling outer diameter, sampling thickness, number of radial divisions, number of circumferential divisions, and number of vertical divisions; performing powder grinding and sampling on the sampling units to obtain target samples; measuring the sample chloride ion content of the target samples; calculating the sample coordinates of the target samples in the first cap concrete according to the radius of the first cap concrete and the sampling parameters, where the sample coordinates include horizontal coordinates, longitudinal coordinates, and vertical coordinates; processing the sample chloride ion content and the sample coordinates according to an isosurface to obtain a chloride ion content distribution map in the first cap concrete.

[0006] According to some embodiments of the present invention, the method for circumferential division includes: setting the center point of the second bearing platform concrete as the ray endpoint; dividing the second bearing platform concrete according to the sampling angle, wherein, in a fixed direction, the angle between the ray and the positive direction of the transverse coordinate axis is the sampling angle.

[0007] According to some embodiments of the present invention, the method for radial division includes: setting the center point of the second bearing platform concrete as the center of a circle, and selecting concentric circles according to the radial radius; performing radial cutting on the first bearing platform concrete according to the concentric circles, wherein the radius of the concentric circle is the sampling outer diameter.

[0008] According to some embodiments of the present invention, the method for vertical division includes: parallel to the cross-section of the second bearing platform concrete, performing vertical cutting on the second bearing platform concrete according to the sampling thickness.

[0009] According to some embodiments of the present invention, the method for determining the sampling volume includes: V = 66.579e 0.1418d , where V is the sampling volume and d is the maximum particle size of coarse aggregate in the concrete.

[0010] According to some embodiments of the present invention, the method for determining the sampling outer diameter includes: when the number of radial division layers is equal to 1, the sampling outer diameter is equal to the radius of the second bearing platform concrete.

[0011] According to some embodiments of the present invention, the method for determining the sampling outer diameter further includes: when the number of radial division layers is greater than 1, the sampling outer diameter is: where l is the number of radial division layers; R l is the sampling outer diameter of the sampling unit when the number of radial division layers is l; R l-1 is the sampling outer diameter of the sampling unit when the number of radial division layers is l - 1; h is the sampling thickness; m is the number of circumferential division layers; θ m is the sampling angle when the number of circumferential division layers is m; θ m-1 is the sampling angle when the number of circumferential division layers is m - 1.

[0012] According to some embodiments of the present invention, calculating the sample coordinates of the target sample in the first bearing platform concrete according to the radius of the first bearing platform concrete and the sampling parameters includes: when the serial number of the sampling unit is equal to 1, the sample coordinates are: where x 1 is the transverse coordinate when the serial number of the sampling unit is 1, y 1 is the longitudinal coordinate when the serial number of the sampling unit is 1, z 1 is the vertical coordinate when the serial number of the sampling unit is 1.

[0013] According to some embodiments of the present invention, calculating the sample coordinates of the target sample in the first pile cap concrete based on the radius of the first pile cap concrete and the sampling parameters further includes: when the serial number of the sampling unit is greater than 1, the sample coordinates are: where x k is the abscissa when the serial number of the sampling unit is k; y k is the longitudinal coordinate when the serial number of the sampling unit is k; z k is the vertical coordinate when the serial number of the sampling unit is k.

[0014] Another aspect of the present invention provides a device for measuring the chloride ion content distribution in a bridge pile cap concrete member, including: a first module for obtaining the first pile cap concrete and performing preprocessing to obtain the second pile cap concrete; a second module for obtaining the coarse aggregate in the first pile cap concrete and calculating and determining the sampling volume according to the maximum particle size of the coarse aggregate; a third module for radially dividing, circumferentially dividing, and vertically dividing the second pile cap concrete according to the sampling parameters to obtain sampling units, where the sampling parameters include: sampling volume, sampling angle, sampling outer diameter, sampling thickness, number of radial divisions, number of circumferential divisions, number of vertical divisions; a fourth module for pulverizing and sampling the sampling units to obtain a target sample; a fifth module for measuring the sample chloride ion content of the target sample; a sixth module for calculating the sample coordinates of the target sample in the first pile cap concrete based on the radius of the first pile cap concrete and the sampling parameters, where the sample coordinates include a transverse coordinate, a longitudinal coordinate, and a vertical coordinate; a seventh module for processing the sample chloride ion content and the sample coordinates according to an isosurface to obtain a chloride ion content distribution map of the first pile cap concrete.

[0015] Another aspect of the present invention provides an electronic device, including a processor and a memory; the memory is used for storing a program; the processor executes the program to implement the method for measuring the chloride ion content distribution in a bridge pile cap concrete member as described in any one of the above.

[0016] The electronic device according to the embodiments of the present invention has at least the same beneficial effects as the above-mentioned method for measuring the chloride ion content distribution in a bridge pile cap concrete member.

[0017] Another aspect of the present invention provides a computer-readable storage medium, where the storage medium stores a program, and the program is executed by a processor to implement the method for measuring the chloride ion content distribution in a bridge pile cap concrete member as described in any one of the above.

[0018] The computer-readable storage medium according to the embodiment of the present invention has at least the same beneficial effects as the above method for measuring the chloride ion content distribution in the bridge pier cap concrete member.

[0019] The embodiment of the present invention also discloses a computer program product or a computer program. The computer program product or the computer program includes computer instructions, and the computer instructions are stored in a computer-readable storage medium. The processor of the computer device can read the computer instructions from the computer-readable storage medium, and the processor executes the computer instructions, so that the computer device executes the above method.

[0020] In the embodiment of the present invention, the first pier cap concrete is pre-treated to obtain the second pier cap concrete; the sampling volume is calculated and determined according to the maximum particle size of the coarse aggregate in the first pier cap concrete; the second pier cap concrete is radially cut, circumferentially cut, and vertically cut according to the sampling parameters to obtain sampling units; the sampling units are ground and sampled to obtain target samples; the sample chloride ion content of the target samples is measured; the sample coordinates of the target samples in the first pier cap concrete are calculated according to the radius of the first pier cap concrete and the sampling parameters, and the chloride ion content distribution map in the first pier cap concrete is obtained by processing according to the sample chloride ion content and the sample coordinates. The relationship between the coarse aggregate and the chloride ion is established, and continuous sampling of the pier cap concrete is realized, thereby improving the reliability of measuring the chloride ion distribution content in the pier cap concrete member. Description of the Drawings

[0021] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the following drawings are only some embodiments of the present application. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained according to these drawings.

[0022] Figure 1 It is a flowchart of the steps of the method for measuring the chloride ion content distribution in the bridge pier cap concrete member provided by the embodiment of the present invention;

[0023] Figure 2 It is a schematic diagram of the division of sampling units on the cross-section of the pier cap concrete member provided by the specific embodiment of the present invention.

[0024] Figure 3 It is a chloride ion content distribution map in the circular cross-section of the pier cap concrete member in the specific embodiment of the present invention.

[0025] Figure 4 It is a slice cloud map of the chloride ion content distribution in the circular cross-section of the pier cap concrete member in the specific embodiment of the present invention.

[0026] Figure 5 It is a sampling schematic diagram of the sampling method and the drilling sampling method adopted in the specific embodiment of the present invention.

[0027] Figure 6 It is a comparison chart of the chloride ion content distribution curves of the sampling method and the drilling sampling method adopted in the specific embodiment of the present invention.

[0028] Figure 7 It is a distribution diagram of the chloride ion content in the circular cross-section of the bearing platform concrete member in another specific embodiment of the present invention.

[0029] Figure 8 It is a sliced cloud diagram of the chloride ion content distribution in the circular cross-section of the bearing platform concrete member in another specific embodiment of the present invention.

[0030] Figure 9 It is a schematic block diagram of a device for measuring the chloride ion content distribution in a bridge bearing platform concrete member provided by an embodiment of the present invention. Specific Embodiments

[0031] In order to make the objectives, technical solutions and advantages of the present application clearer, the present application will be further described in detail below with reference to 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.

[0032] Refer to Figure 1 , the method of the embodiment of the present invention includes:

[0033] Step S100, obtaining the first bearing platform concrete and performing pretreatment to obtain the second bearing platform concrete.

[0034] Specifically, the surface layer of the first bearing platform concrete is dried, and the crystal salts on the surface of the member are polished off to obtain the second bearing platform concrete. It should be noted that the intrusion of chloride ions into the bearing platform is three-dimensional, and the cross-section of the bearing platform concrete member is circular.

[0035] Step S200, obtaining the coarse aggregate in the first bearing platform concrete, and calculating and determining the sampling volume according to the maximum particle size of the coarse aggregate.

[0036] Specifically, the formula for determining the sampling volume is: V = 66.579e 0.1418d . Wherein, V is the sampling volume, with the unit of mm 3 , and d is the maximum particle size of the coarse aggregate in the concrete, with the unit of mm. A quantitative calculation formula for the sampling volume with respect to the maximum particle size of the aggregate is established, eliminating the influence of the non-uniform distribution of the aggregate on the test results of the chloride ion content in the concrete, and improving the reliability of evaluating the chloride ion content distribution in the bearing platform concrete member.

[0037] In another embodiment, the specific design method of the sampling parameters is:

[0038] Determine the sampling angle in the sampling parameters according to the sampling precision requirement; determine the sampling thickness according to the sampling precision requirement.

[0039] The method for determining the sampling outer diameter is as follows:

[0040] When the number of radial division layers is equal to 1, the sampling outer diameter is equal to the radius of the second pile cap concrete, and the formula is: R l = r, (l = 1), where r is the radius of the second pile cap concrete, and the unit is mm. When the number of radial division layers is greater than 1, the sampling outer diameter is:

[0041]

[0042] where l is the number of radial division layers; R l is the sampling outer diameter of the sampling unit when the number of radial division layers is l, and the unit is mm; R l-1 is the sampling outer diameter of the sampling unit when the number of radial division layers is l - 1, and the unit is mm; h is the sampling thickness, and the unit is mm; m is the number of circumferential division layers; θ m is the sampling angle when the number of circumferential division layers is m; θ m-1 is the sampling angle when the number of circumferential division layers is m - 1.

[0043] Step S300, perform radial cutting, circumferential cutting, and vertical cutting on the second pile cap concrete according to the sampling parameters to obtain sampling units. The sampling parameters include: sampling volume, sampling angle, sampling outer diameter, sampling thickness, number of radial division layers, number of circumferential division layers, and number of vertical division layers;

[0044] Specifically, set the center point of the second pile cap concrete as the ray endpoint, and perform circumferential division on the second pile cap concrete with m rays according to the sampling angle. Among them, in accordance with a fixed direction, the angle between the ray and the positive direction of the horizontal coordinate axis is the sampling angle, and the sampling angles are successively: θ 1 , θ 2 , … θ m (θ m ≤ 2π). It can be understood that the fixed direction can be calculated from the counterclockwise direction or the clockwise direction for the angle between the ray and the positive direction of the horizontal coordinate axis, so as to ensure the consistency of the direction when calculating the sampling angle. In addition, the sampling angle does not refer to the angle of a single sampling unit, but the angle between the dividing line during circumferential division and the positive direction of the left side of the horizontal coordinate. Set the center point of the second pile cap concrete as the center of the circle, and select concentric circles according to the radial radius; perform radial cutting on the first pile cap concrete according to the concentric circles. Among them, the radius of the concentric circle is the sampling outer diameter, and the sampling outer diameters are successively R 1 , R 2 , …, R l. Parallel to the cross-section of the second bearing platform concrete, the second bearing platform concrete is vertically sliced according to the sampling thickness, where the sampling thickness is h 1 , h 2 , …, h n . It can be understood that the number of circumferential division layers is m, the number of radial division layers is l, and the number of vertical division layers is n. The bearing platform component is divided into mn(l - 1) hexahedron sampling units, θ m -θ m-1 as the included angle of the sampling unit, R l as the sampling outer diameter of the sampling unit, h n as the sampling thickness of the sampling unit.

[0045] Step S400, perform grinding and sampling on the sampling unit to obtain the target sample.

[0046] Specifically, for different sampling units, grinding and sampling are carried out separately. The grinding and 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 should be noted that an electroplated diamond grinding head with a hollow structure can be used for sampling.

[0047] Step S500, measure the chloride ion content of the target sample.

[0048] Specifically, use the method of boiling and then static soaking and the potentiometric automatic titration method to measure the chloride ion content in each target sample.

[0049] Step S600, calculate the sample coordinates of the target sample in the first bearing platform concrete according to the radius of the first bearing platform concrete and the sampling parameters, where the sample coordinates include horizontal coordinates, longitudinal coordinates, and vertical coordinates.

[0050] Specifically, when the serial number of the sampling unit is equal to 1, the sample coordinates are:

[0051]

[0052] where x 1 is the horizontal coordinate when the serial number of the sampling unit is 1, y 1 is the longitudinal coordinate when the serial number of the sampling unit is 1, z 1 is the vertical coordinate when the serial number of the sampling unit is 1.

[0053] When the serial number of the sampling unit is greater than 1, the sample coordinates are:

[0054]

[0055] where x k is the abscissa when the serial number of the sampling unit is k; yk is the longitudinal coordinate when the serial number of the sampling unit is k; z k is the vertical coordinate when the serial number of the sampling unit is k. A general calculation formula for the sample coordinate suitable for the concrete component of the circular-section bridge pile cap is established, improving the efficiency of obtaining the coordinates of the sample for sampling.

[0056] Step S700, process the sample chloride content and the sample coordinates according to the isosurface to obtain the chloride content distribution map of the first pile cap concrete.

[0057] Specifically, determine the coordinates of each sampling unit based on the sampling unit coordinate calculation formula, combine the chloride content test results of each sampling unit, and draw the chloride content distribution nephogram of the pile cap concrete component based on the isosurface calculation method. According to the chloride content distribution map, the distribution law of the chloride content in the circular-section bridge pile cap concrete component can be accurately and quickly obtained.

[0058] The technical solution of the present invention will be further described in detail below through embodiments.

[0059] Embodiment 1

[0060] Three cylindrical pile cap concrete components with a water-cement ratio of 0.5 are formed. The maximum aggregate size selected is 25 mm, the component size is φ140×150 mm, and after standard curing for 28 days, they are exposed to artificial seawater for 2 years. The cylindrical pile cap concrete components are taken out of the seawater, and the present invention is used to test the chloride content distribution in the cylindrical pile cap concrete components. The following steps are included:

[0061] (1) Pretreatment of the concrete component: Wipe the surface of the pile cap concrete component dry, put it into an oven, control the oven temperature at about 60°C, take out the component after 24 hours, and grind off the crystalline salts on the surface of the component;

[0062] (2) Division of sampling units: i) Circumferential division: Take the center point of the pile cap component as the ray endpoint, and use 8 rays to divide the pile cap component circumferentially. In the counterclockwise direction, the angles between the rays and the positive x-axis are π / 4, π / 2, 3π / 4, π, 5π / 4, 3π / 2, 7π / 4, 2π in turn; ii) Radial division: Take the center point of the pile cap component as the center of the circle, and use concentric circles to divide the pile cap component. The radii of the concentric circles are 70 mm, 65 mm, 60 mm, 54 mm, 48 mm, 41 mm, 33 mm from large to small in turn; iii) Vertical division: Divide the pile cap component vertically, and the thickness is 10 mm each; iv) Determine the sampling unit: The circumferential division quantity is 8, the radial division layer number is 8 layers, and the vertical division layer number is 10 layers. The pile cap component is divided into 8×(8 - 1)×10 = 560 hexahedral sampling units, as Figure 2 shown;

[0063] (3) Sampling unit parameter design: i) Determine the volume of the sampling unit: Substitute the maximum particle size d = 25 mm of the coarse aggregate selected for the concrete into the sampling volume calculation formula V = 66.579e 0.1418d , and determine the volume of the sampling unit to be 2306 mm 3 ; ii) Determine the included angle of the sampling unit: According to the sampling accuracy requirements, determine that the included angle of the sampling unit is π / 4; iii) Determine the outer diameter of the sampling unit: Given that the radius of the concrete member is R 1 = 70 mm, according to the outer diameter calculation formula of the sampling unit, calculate and obtain

[0064]

[0065] iv) Determine the thickness of the sampling unit: According to the sampling accuracy requirements, determine that the thickness of the sampling unit is 10 mm;

[0066] (4) Grinding and sampling: For the above 560 hexahedron sampling units, perform grinding and sampling respectively, and a total of 560 concrete powder samples are obtained;

[0067] (5) Determine the chloride ion content: Weigh about 6 g of concrete powder from each sample, pass it through a 0.315 sieve, then clean and soak it in pure ethanol (ethanol content ≥ 95%) for 24 hours to terminate the cement hydration; Filter out the powder sample by suction, put it in a vacuum drying oven at 60 °C for drying for later use; Select the chloride ion extraction method of boiling and standing for 24 h to obtain the filtrate of the concrete powder sample containing chloride ions, use a potentiometric automatic titration device to measure the acid-soluble chloride ion content in the filtrate, and then divide the chloride ion content by the mass of the concrete powder weighed from each sample to calculate the chloride ion content corresponding to each sample;

[0068] (6) Determine the distribution of chloride ion content in the concrete: Based on the sampling unit coordinate calculation formula, determine that the coordinates of the No. 1 sampling unit are

[0069]

[0070] The coordinates of the No. 2 sampling unit are

[0071]

[0072] And so on, successively determine the coordinate calculations of the remaining 558 sampling units. Combining the chloride ion content test results of each sampling unit, based on the isosurface calculation method, draw the chloride ion content distribution cloud map of the pile cap concrete member, as shown in Figure 3 . Further, draw the chloride ion content distribution cloud map of different cutting planes, as shown in Figure 4 .

[0073] For a specific example to verify the superiority of the method of the present invention, the drilling sampling method in the prior art was tested, and a comparison was made based on the test results of the chloride ion content of the sampling method of the bearing platform concrete in Example 1 and the sampling method of the bearing platform concrete by drilling sampling:

[0074] The parallel samples of the cylindrical bearing platform concrete member in Example 1 were cut to make two cylinders A and B with equal height, with dimensions of φ140×75 mm. One cylinder A was selected, and drilling sampling was carried out along the radial direction on its cutting 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 along the chloride ion diffusion direction, the diffusion depths were 2.5 mm, 7.5 mm, 13 mm, 19 mm, 25.5 mm, 33 mm, 42.5 mm, as Figure 5 shown, and the chloride ion content of each drilled sample was tested, which were 0.80%, 1.01%, 0.72%, 0.61%, 0.55%, 0.13%, 0.05% respectively.

[0075] Another cylinder B was selected for comparison, and the concrete sampling method in Example 1 was used to Figure 5 carry out powder sampling on the sampling unit at the shaded part. The diffusion depths of the samples were 2.5 mm, 7.5 mm, 13 mm, 19 mm, 25.5 mm, 33 mm, 42.5 mm in sequence, and the chloride ion content of each layer of samples was 1.20%, 0.88%, 0.66%, 0.52%, 0.36%, 0.25%, 0.12% respectively.

[0076] The chloride ion content distribution curves obtained by drilling sampling and the chloride ion content distribution curves obtained by the method of the present invention were respectively plotted, as Figure 6 shown.

[0077] Through comparison, the chloride ion content distribution curve measured in Example 1 was smooth, and its law conforms to Fick's second law. The chloride ion content distribution curve measured by drilling sampling showed obvious fluctuation characteristics, and its law generally conforms to Fick's second law; this is mainly because the volume of the samples in Example 1 was about 2.3 cm 3 or so, the ratio of the content of coarse aggregate to the content of cement mortar in the samples was basically constant, while the volume of the samples in drilling sampling was 0.2 cm 3Around, the ratio of the content of coarse aggregate to the content of cement mortar in the sample fluctuates greatly. It is very likely that the sample is all coarse aggregate or all cement mortar, resulting in an abnormally small or large chloride ion content in the sample. From the above analysis, it can be seen that this method can eliminate the influence of coarse aggregate and has the advantage of accurately testing the distribution law of chloride ion content in concrete, reflecting the superiority of the method of the present invention.

[0078] Example 2

[0079] This example is to test the chloride ion content distribution in the concrete members of the bearing platform of a certain cross-sea bridge that has been in service for 56 years. The cross-sea bridge is located in a coastal city, and the bearing platform is exposed to the underwater area of the marine environment. The cross-section of the bearing platform is circular with a diameter of 2000 mm and a cover thickness of 70 mm. Obtaining the chloride ion content distribution in the concrete members of the bearing platform includes the following steps:

[0080] (1) Pretreatment of concrete members: The surface layer of the bearing platform concrete members is dried, and the crystalline salts on the surface of the members are polished off.

[0081] (2) Division of sampling units: i) Circumferential division: Taking the center point of the bearing platform member as the ray endpoint, the bearing platform member is circumferentially divided by 16 rays. In the counterclockwise direction, the angles between the rays and the positive x-axis are π / 8, π / 4, 3π / 8, π / 2, 5π / 8, 3π / 4, 7π / 8, π, 9π / 8, 5π / 4, 11π / 8, 3π / 2, 13π / 8, 7π / 4, 15π / 8, 2π in turn; ii) Radial division: Taking the center point of the bearing platform member as the center of the circle, the bearing platform member is divided by concentric circles. The radii of the concentric circles are 1000 mm, 992 mm, 984 mm, 976 mm, 968 mm, 960 mm, 952 mm, 944 mm, 936 mm, 928 mm from large to small in turn; iii) Vertical division: The bearing platform member is vertically divided, and the thickness is 2 mm each; iv) Determination of sampling units: The number of circumferential divisions is 16, the number of radial division layers is 10, and the number of vertical division layers is 15. The bearing platform member is divided into 16×(10 - 1)×15 = 2160 hexahedron sampling units;

[0082] (3) Design of sampling unit parameters: i) Determination of sampling unit volume: Substitute the maximum particle size d = 31.5 mm of the coarse aggregate selected for the concrete into the sampling volume calculation formula V = 66.579e 0.1418d , and determine the sampling unit volume of 5797 mm 3 ; ii) Determination of the angle of the sampling unit: According to the sampling accuracy requirements, determine that the angle of each sampling unit is π / 8; iii) Determination of the outer diameter of the sampling unit: Given that the radius of the concrete member is R 1 = 1000 mm, according to the outer diameter calculation formula of the sampling unit, calculate and obtain

[0083]

[0084] iv) Determine the thickness of the sampling unit: According to the sampling accuracy requirements, determine the thickness of the sampling unit to be 2 mm;

[0085] (4) Pulverize and sample: For the above 2,160 hexahedron sampling units, perform pulverizing and sampling respectively, and a total of 2,160 concrete powder samples are obtained;

[0086] (5) Determine the chloride ion content: Weigh about 14 g of concrete powder from each sample, pass it through a 0.315 sieve, then wash and soak it in pure ethanol (ethanol content ≥ 95%) for 24 hours to terminate the cement hydration; Filter out the powder sample by suction filtration, put it in a vacuum drying oven at 60 °C for drying for later use; Select the chloride ion extraction method of boiling and standing for 24 h to obtain the filtrate of the concrete powder sample containing chloride ions, use a potentiometric automatic titration device to determine the acid-soluble chloride ion content in the filtrate, and then divide the chloride ion content by the mass of the concrete powder weighed from each sample to calculate the chloride ion content corresponding to each sample;

[0087] (6) Determine the distribution of chloride ion content in the concrete: Based on the coordinate calculation formula of the sampling unit, determine the coordinates of the No. 1 sampling unit as

[0088]

[0089] The coordinates of the No. 2 sampling unit are

[0090]

[0091] And so on, successively determine the coordinate calculations of the remaining 2,158 sampling units. Combining the test results of the chloride ion content of each sampling unit, based on the isosurface calculation method, draw the chloride ion content distribution nephogram in the pile cap concrete component, as Figure 7 shown. Further, draw the chloride ion content distribution nephogram of different cutting planes, as Figure 8 shown.

[0092] On the one hand, referring to the figure, this embodiment provides a device for measuring the distribution of chloride ion content in a bridge pile cap concrete component, which at least includes: a first module 910, a second module 920, a third module 930, a fourth module 940, a fifth module 950, a sixth module 960, and a seventh module 970.

[0093] Specifically, the first module 910 is used to obtain the first bearing platform concrete and perform preprocessing to obtain the second bearing platform concrete; the second module 920 is connected to the first module 910, obtains the coarse aggregate in the first bearing platform concrete, and calculates and determines the sampling volume according to the maximum particle size of the coarse aggregate; the third module 930 is connected to the second module 920, and radially divides, circumferentially divides, and vertically divides the second bearing platform concrete according to the sampling parameters to obtain sampling units, and the sampling parameters include: sampling volume, sampling angle, sampling outer diameter, sampling thickness, number of radial divisions, number of circumferential divisions, and number of vertical divisions; the fourth module 940 is connected to the third module 930 and is used to perform powder grinding sampling on the sampling units to obtain target samples; the fifth module 950 is connected to the fourth module 940 and is used to measure the sample chloride content of the target samples; the sixth module 960 is connected to the third module 930 and calculates the sample coordinates of the target samples in the first bearing platform concrete according to the radius of the first bearing platform concrete and the sampling parameters, where the sample coordinates include horizontal coordinates, longitudinal coordinates, and vertical coordinates; the seventh module 970 is connected to the sixth module 960 and the fifth module 950 and is used to process the sample chloride content and the sample coordinates according to the isosurface to obtain the chloride content distribution map of the first bearing platform concrete.

[0094] An embodiment of the present invention also discloses a computer program product or a computer program, which includes computer instructions, and the computer instructions are stored in a computer-readable storage medium. The processor of the computer device can read the computer instructions from the computer-readable storage medium, and the processor executes the computer instructions, so that the computer device executes Figure 1 the method shown.

[0095] In some alternative embodiments, the functions / operations mentioned in the block diagram may not occur in the order mentioned in the operation diagram. For example, depending on the functions / operations involved, two consecutive blocks shown may actually be executed substantially simultaneously or the blocks can sometimes be executed in the reverse order. In addition, the embodiments presented and described in the flowcharts of the present invention are provided by way of example for the purpose of providing a more comprehensive understanding of the technology. The disclosed methods are not limited to the operations and logical flows presented herein. Alternative embodiments are foreseeable, in which the order of various operations is changed and the sub-operations described as part of the larger operations are executed independently.

[0096] In addition, although the present invention has been described in the context of functional modules, it should be understood that, unless otherwise stated to the contrary, one or more of the functions and / or features described may be integrated in 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 should also be understood that a detailed discussion of the actual implementation of each module is not necessary for understanding the present invention. Rather, given the attributes, functions, and internal relationships of the various functional modules in the devices disclosed herein, the actual implementation of the modules will be understood within the ordinary skills of an engineer. Thus, those skilled in the art can implement the present invention as set forth in the claims without undue experimentation. It should also be 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.

[0097] If the described 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, in essence, or the part that contributes to the prior art, or a part of this technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to execute all or part of the steps of the methods described in the various embodiments of the present invention. The aforementioned storage medium includes: various media such as USB flash drives, mobile hard disks, read-only memories (ROMs), random access memories (RAMs), magnetic disks, or optical discs that can store program codes.

[0098] The logic and / or steps represented in the flowchart or otherwise described herein, for example, can be considered as a predefined sequence of executable instructions for implementing logical functions, and can be specifically implemented in any computer-readable medium for use by an instruction execution system, apparatus, or device (such as a computer-based system, a system including a processor, or other systems that can fetch and execute instructions from the instruction execution system, apparatus, or device), or in conjunction with these instruction execution systems, apparatuses, or devices. For the purposes of this specification, a "computer-readable medium" can be any device that can contain, store, communicate, propagate, or transport a program for use by or in conjunction with an instruction execution system, apparatus, or device.

[0099] More specific examples (a non-exhaustive list) of computer-readable media include the following: an electrical connection (electronic device) having one or more wirings, a portable computer diskette (magnetic device), a random access memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber device, and a portable compact disc read-only memory (CDROM). Additionally, the computer-readable media can even be paper or other suitable media on which the program can be printed, because the program can be obtained electronically, for example, by optically scanning the paper or other media, then editing, interpreting, or otherwise processing it as appropriate, and then storing it in a computer memory.

[0100] 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 embodiments, multiple 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, any one or a combination of the following techniques well known in the art can be used: discrete logic circuits having logic gate circuits for implementing logical functions on data signals, application specific integrated circuits having appropriate combinational logic gate circuits, programmable gate arrays (PGAs), field programmable gate arrays (FPGAs), and the like.

[0101] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples", etc. means that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0102] Although the embodiments of the present invention have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of the present invention, and the scope of the present invention is defined by the claims and their equivalents.

[0103] The above has specifically described the preferred embodiments of the present invention, but the present invention is not limited to the described embodiments. Those skilled in the art can also make various equivalent deformations or substitutions without departing from the spirit of the present invention, and these equivalent deformations or substitutions are all included within the scope defined by the claims of this application.

Claims

1. A method for measuring the chloride ion content distribution in a bridge pier cap concrete member, characterized in that, it includes: Obtaining the first pier cap concrete and performing pretreatment to obtain the second pier cap concrete; Obtaining the coarse aggregate in the first pier cap concrete, and calculating and determining the sampling volume according to the maximum particle size of the coarse aggregate. Among them, the method for determining the sampling volume includes: ， Among them, is the sampling volume, is the maximum particle size of coarse aggregate in concrete; Radially cutting, circumferentially cutting, and vertically cutting the second pier cap concrete according to sampling parameters to obtain sampling units. The sampling parameters include: sampling volume, sampling angle, sampling outer diameter, sampling thickness, number of radial divisions, number of circumferential divisions, and number of vertical divisions; among them, the method for circumferential division includes setting the center point of the second pier cap concrete as the ray endpoint, and dividing the second pier cap concrete according to the sampling angle. Among them, in a fixed direction, the angle between the ray and the positive direction of the horizontal coordinate axis is the sampling angle; the method for radial division includes setting the center point of the second pier cap concrete as the center of the circle, selecting concentric circles according to the radial radius, and radially cutting the first pier cap concrete according to the concentric circles. Among them, the radius of the concentric circle is the sampling outer diameter; the method for vertical division includes parallel to the cross-section of the second pier cap concrete, and vertically cutting the second pier cap concrete according to the sampling thickness; Performing powder grinding sampling on the sampling unit to obtain a target sample; Measuring the chloride ion content of the target sample; Calculating the sample coordinates of the target sample in the first pier cap concrete according to the radius of the first pier cap concrete and the sampling parameters. Among them, the sample coordinates include horizontal coordinates, longitudinal coordinates, and vertical coordinates; Processing the sample chloride ion content and the sample coordinates according to the isosurface to obtain the chloride ion content distribution map in the first pier cap concrete.

2. The method for measuring the chloride ion content distribution in a bridge pier cap concrete member according to claim 1, characterized in that, the method for determining the sampling outer diameter includes: When the number of radial divisions is equal to 1, the sampling outer diameter is equal to the radius of the second pier cap concrete.

3. The method for measuring the chloride ion content distribution in a bridge pier cap concrete member according to claim 1, characterized in that, the method for determining the sampling outer diameter also includes: When the number of radial divisions is greater than 1, the sampling outer diameter is: ， Among them, is the number of layers divided radially; is the sampling outer diameter of the sampling unit when the number of layers divided radially is ; is the sampling outer diameter of the sampling unit when the number of layers divided radially is ; is the sampling thickness; is the number of layers divided circumferentially; is the sampling angle when the number of layers divided circumferentially is m; is when the number of layers divided circumferentially is the sampling angle.

4. The method for measuring the chloride ion content distribution in a bridge pier cap concrete member according to claim 1, characterized in that, the calculating the sample coordinates of the target sample in the first pier cap concrete according to the radius of the first pier cap concrete and the sampling parameters includes: When the serial number of the sampling unit is equal to 1, the sample coordinates are: ， Among them, is the horizontal coordinate when the serial number of the sampling unit is 1, is the vertical coordinate when the serial number of the sampling unit is 1, is the vertical coordinate when the serial number of the sampling unit is 1.

5. The method for measuring the chloride ion content distribution in a bridge pier cap concrete member according to claim 1, characterized in that, the calculating the sample coordinates of the target sample in the first pier cap concrete according to the radius of the first pier cap concrete and the sampling parameters also includes: When the serial number of the sampling unit is greater than 1, the sample coordinates are: ， Among them, is the abscissa when the serial number of the sampling unit is ; is the ordinate when the serial number of the sampling unit is ; is the vertical coordinate when the serial number of the sampling unit is .

6. A device for measuring the chloride ion content distribution in a bridge cap concrete component, characterized in that, it includes: A first module for obtaining the first bridge cap concrete and performing pretreatment to obtain the second bridge cap concrete; A second module for obtaining the coarse aggregate in the first bridge cap concrete and calculating and determining the sampling volume according to the maximum particle size of the coarse aggregate. Among them, the method for determining the sampling volume includes: ， Among them, is the sampling volume, is the maximum size of coarse aggregate in concrete; A third module for radially cutting, circumferentially cutting, and vertically cutting the second bridge cap concrete according to the sampling parameters to obtain sampling units. The sampling parameters include: sampling volume, sampling angle, sampling outer diameter, sampling thickness, number of radial divisions, number of circumferential divisions, and number of vertical divisions; among them, the method for circumferential division includes setting the center point of the second bridge cap concrete as the ray endpoint and dividing the second bridge cap concrete according to the sampling angle. Among them, in a fixed direction, the angle between the ray and the positive direction of the horizontal coordinate axis is the sampling angle; the method for radial division includes setting the center point of the second bridge cap concrete as the center of the circle, selecting concentric circles according to the radial radius, and radially cutting the first bridge cap concrete according to the concentric circles. Among them, the radius of the concentric circle is the sampling outer diameter; the method for vertical division includes parallel to the cross-section of the second bridge cap concrete and vertically cutting the second bridge cap concrete according to the sampling thickness; A fourth module for grinding and sampling the sampling unit to obtain a target sample; A fifth module for measuring the chloride ion content of the target sample; A sixth module for calculating the sample coordinates of the target sample in the first bridge cap concrete according to the radius of the first bridge cap concrete and the sampling parameters. Among them, the sample coordinates include horizontal coordinates, longitudinal coordinates, and vertical coordinates; A seventh module for processing the chloride ion content of the sample and the sample coordinates according to the isosurface to obtain the chloride ion content distribution map of the first bridge cap concrete.

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