A method for determining aggregates for compression casting concrete based on X-CT imaging

Abstract

The present invention discloses a method for selecting aggregates for compression casting concrete, so that the boundaries between aggregates and mortar in X-CT imaging of the concrete are clear. The method comprises: taking any kind of aggregate, preparing compression casting concrete under corresponding pressure p (ordinary casting concrete when p is zero) and compression casting cement mortar corresponding to the concrete formula (i.e. concrete without coarse aggregate corresponding to the compression casting concrete), testing the specific gravity g of the aggregate and the specific gravity s of the cement mortar specimen after standard curing for 28 days, and calculating the relative specific gravity difference q=(g-s) / s between the two; if q≥R (R is a constant, which is the relative density difference that enables clear imaging of aggregates in compression casting concrete corresponding to the density resolution of X-CT imaging equipment), then the aggregate is suitable for the compression casting concrete formula and can enable the aggregate to be clearly imaged on the corresponding X-CT equipment. A kind of aggregate selection. The method for selecting suitable aggregates disclosed in the present invention can improve the quality of X-CT imaging of compression casting concrete.

Description

Technical Field

[0001] The invention relates to the technical field of civil engineering, and in particular to an aggregate determination method for compression casting concrete based on X-CT imaging. Background Art

[0002] In recent years, with the development of CT imaging science and technology, X-ray computed tomography (X-CT) has made great technological progress and is widely used in non-destructive testing of engineering structures, differentiation of concrete material phases (cementitious materials, aggregates), microstructure characterization, crack evolution of concrete structures under extremely harsh environments, steel corrosion and erosion penetration, etc. X-CT technology provides advanced research means and observation methods for the durability and reliability research of concrete materials and structures.

[0003] However, in the application and research of X-CT technology in compression cast concrete, for compression cast concrete prepared with conventional aggregates, the X-CT imaging quality is poor, and it is impossible to effectively distinguish the phase composition, and even impossible to perform data analysis, which will greatly limit the application of X-CT technology in compression cast concrete.

[0004] The X-CT imaging quality of compression cast concrete prepared with conventional aggregates is poor, and it is necessary to select aggregates for preparing compression cast concrete from different types of aggregates. The existing technology cannot select aggregates that make the X-CT imaging quality of compression cast concrete better.

[0005] Therefore, the prior art still needs to be improved and developed. Summary of the invention

[0006] The main purpose of the present invention is to provide a method for determining aggregates for compression cast concrete based on X-CT imaging, aiming to solve the problem in the prior art that aggregates cannot be accurately selected, resulting in poor X-CT imaging quality of the prepared compression cast concrete.

[0007] A first aspect of an embodiment of the present application provides a method for determining aggregates for compression casting concrete based on X-CT imaging, and the method for determining aggregates for compression casting concrete based on X-CT imaging comprises the following steps: obtaining any aggregate; preparing initial concrete and cement mortar corresponding to the any aggregate; obtaining the aggregate saturation specific gravity corresponding to the any aggregate and the mortar saturation specific gravity corresponding to the cement mortar; calculating the relative specific gravity difference between the any aggregate and the cement mortar according to the aggregate saturation specific gravity and the mortar saturation specific gravity; wherein the relative specific gravity difference corresponds to the X-CT imaging quality of concrete prepared using the any aggregate; if the relative specific gravity difference is greater than a reference value, taking the any aggregate corresponding to the relative specific gravity difference as a target aggregate for preparing compression casting concrete.

[0008] Optionally, in one embodiment of the present application, the reference value is 20%.

[0009] Optionally, in one embodiment of the present application, the preparation of the initial concrete and cement mortar corresponding to any one of the aggregates specifically includes: obtaining any mix ratio; determining the required amounts of sand, water, cement and any one of the aggregates according to the any one of the mix ratios; mixing and stirring the sand, water, cement and any one of the aggregates in corresponding amounts to obtain initial concrete, and sieving part of the initial concrete using a standard square hole sieve with a pore size of 4.75 mm to obtain cement mortar.

[0010] Optionally, in one embodiment of the present application, the aggregate saturation specific gravity corresponding to any one of the aggregates is expressed as:

[0011]

[0012] Where g represents the saturated specific gravity of aggregate, m s is the mass of any of the aggregates, m1 is the mass of the container and the water filling the container, m2 is the mass of the container and the mass of the container filled with any of the aggregates and water, G wt is the specific gravity of distilled water.

[0013] Optionally, in one embodiment of the present application, the relative specific gravity difference between any one aggregate and the cement mortar is calculated based on the saturated specific gravity of the aggregate and the saturated specific gravity of the mortar, specifically including: calculating the absolute value of the difference between the saturated specific gravity of the aggregate and the saturated specific gravity of the mortar; calculating the ratio of the absolute value to the saturated specific gravity of the mortar to obtain a relative specific gravity difference; the formula for the relative specific gravity difference is expressed as: q=(gs) / s; wherein q is the relative specific gravity difference, g is the saturated specific gravity of the aggregate, and s is the saturated specific gravity of the mortar.

[0014] Optionally, in one embodiment of the present application, the relative specific gravity difference between any one of the aggregates and the cement mortar is calculated according to the saturated specific gravity of the aggregate and the saturated specific gravity of the mortar, and then the method further includes: if the relative specific gravity difference is less than a reference value, updating any one of the aggregates to obtain an updated any one of the aggregates; using the updated any one of the aggregates to prepare initial concrete and calculating the corresponding updated relative specific gravity difference until the updated relative specific gravity difference is greater than the reference value, and using the updated any one of the aggregates corresponding to the updated relative specific gravity difference as the target aggregate for preparing compressed casting concrete.

[0015] Optionally, in one embodiment of the present application, any one of the aggregates is one of quartz stone, limestone, talc, granite, pebbles, recycled aggregate, rubber crumbs, artificial ceramsite and steel fiber.

[0016] Optionally, in one embodiment of the present application, if the relative specific gravity difference is greater than a reference value, any one of the aggregates corresponding to the relative specific gravity difference is used as a target aggregate for preparing compressed cast concrete, and then the method further includes: using the target aggregate as a coarse aggregate to prepare compressed cast concrete to obtain target concrete; and performing an X-CT scan on the target concrete to obtain a target X-CT image.

[0017] Optionally, in one embodiment of the present application, the aggregate determination method for compression cast concrete based on X-CT imaging also includes: obtaining a control aggregate, preparing a control concrete corresponding to the control aggregate, and calculating the specific gravity difference corresponding to the control concrete; performing X-CT scanning on the initial concrete and the control concrete respectively to obtain an initial image and a control image; reconstructing the initial image and the control image respectively to obtain an initial reconstructed image corresponding to any one of the aggregates and a control reconstructed image corresponding to the control aggregate; and obtaining a corresponding relationship between the relative specific gravity difference and the X-CT imaging quality of concrete made using any one of the aggregates based on the relative specific gravity difference, the initial reconstructed image, the specific gravity difference, and the control reconstructed image.

[0018] Optionally, in one embodiment of the present application, the correspondence between the relative specific gravity difference and the X-CT imaging quality of concrete made using any one of the aggregates is obtained based on the relative specific gravity difference, the initial reconstructed image, the specific gravity difference and the control reconstructed image, and then further includes: identifying the initial reconstructed image to obtain the distribution boundary characteristics of any one of the aggregates and the cement mortar; determining the reference value corresponding to the target aggregate based on the relative specific gravity difference, the distribution boundary characteristics and the correspondence.

[0019] Beneficial effect: The present invention provides a method for determining aggregates for compression casting concrete based on X-CT imaging. The method prepares compression casting concrete by using different coarse aggregates as raw materials, and compares the relative specific gravity difference between different aggregates and corresponding mortars, thereby determining special aggregates as the raw materials for compression casting concrete, thereby improving the X-CT imaging quality of compression casting concrete. BRIEF DESCRIPTION OF THE DRAWINGS

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

[0021] Figure 1It is a flow chart of a preferred embodiment of the method for determining aggregates for compression casting concrete based on X-CT imaging of the present application;

[0022] Figure 2 It is a flow chart for the preparation of compression cast concrete and compression cast cement mortar with different types of aggregates;

[0023] Figure 3 It is a flowchart of specific implementation steps of the entire execution process in a preferred embodiment of the method for determining aggregates for compression casting concrete based on X-CT imaging of the present application;

[0024] Figure 4 It is a schematic diagram of conventional aggregates, special aggregates and other materials in a preferred embodiment of the method for determining aggregates for compression casting concrete based on X-CT imaging of the present application;

[0025] Figure 5 It is a schematic diagram of X-CT scanning and reconstructed images of compression cast concrete specimens and compression cast cement mortar specimens with different aggregate types in a preferred embodiment of the method for determining aggregates of compression cast concrete based on X-CT imaging of the present application. DETAILED DESCRIPTION

[0026] In order to make the purpose, technical scheme and effect of the present invention clearer and more specific, the technical scheme in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. The described embodiments are only possible technical implementations of the present invention, not all possible implementations. Based on the embodiments of the present invention, those skilled in the art can completely combine the embodiments of the present invention to obtain other embodiments without creative work, and these embodiments are also within the scope of protection of the present invention.

[0027] Despite the obvious advantages of X-CT technology, there are still challenges in the imaging process of compression cast concrete. Especially when conventional aggregates are used to prepare compression cast concrete, the quality of compression cast concrete X-CT imaging is often poor due to the influence of various factors (such as aggregate type, water-cement ratio, cement content, sand ratio, sand density, compression pressure and concrete uniformity, etc.), which limits the further application of X-CT technology.

[0028] The present invention improves the imaging quality and better distinguishes the different phases inside the concrete by selecting a special type of aggregate. By improving the imaging quality, it can not only promote the application of X-CT technology in the field of compression casting concrete, but also help to improve the understanding of the internal structure and performance of concrete materials, thereby providing important technical support for the durability and reliability research of concrete structures.

[0029] The following describes the aggregate determination method for compression casting concrete based on X-CT imaging according to an embodiment of the present application with reference to the accompanying drawings. In view of the problem of how to select aggregates in the above-mentioned related art so that the prepared compression casting concrete has good X-CT imaging quality, the present application provides an aggregate determination method for compression casting concrete based on X-CT imaging, in which different coarse aggregates are used as raw materials to prepare compression casting concrete, and the relative specific gravity difference q between the aggregates and the corresponding mortar is compared, so as to determine the special aggregate as the raw material for compression casting concrete, so as to improve the X-CT imaging quality of compression casting concrete. Thus, the technical problem of how to select aggregates in the related art so that the prepared compression casting concrete has good X-CT imaging quality is solved.

[0030] Specifically, the aggregate selection method for compression cast concrete of the present invention makes the boundary between aggregate and mortar in the X-CT imaging of the concrete clear. The method takes any kind of aggregate, prepares compression cast concrete under the corresponding pressure p (ordinary cast concrete when p is zero) and compression cast cement mortar corresponding to the concrete formula (i.e. concrete without coarse aggregate corresponding to the compression cast concrete), tests the aggregate specific gravity g and the specific gravity s of the cement mortar specimen after 28 days of standard curing, and calculates the relative specific gravity difference q=(gs) / s between the two; if q≥R (R is a constant, which is the relative density difference that enables clear imaging of aggregates in the compression cast concrete corresponding to the density resolution of the X-CT imaging device), then the aggregate is suitable for the compression cast concrete formula and can enable the aggregate to be clearly imaged on the corresponding X-CT device. A kind of aggregate selection. The method for selecting suitable aggregates disclosed in the present invention can improve the X-CT imaging quality of compression cast concrete. It should be noted that the saturated specific gravity of aggregate and the saturated specific gravity of mortar can be converted into each other with the above-mentioned density, and the following contents are all described in terms of specific gravity.

[0031] The present invention selects suitable aggregates (such as limestone and talc) by comparing the relative specific gravity difference between the aggregates and the compression casting cement mortar, thereby improving the X-CT imaging quality of the compression casting concrete; when the relative specific gravity difference q between the aggregates and the compression casting cement mortar exceeds 20%, the X-CT imaging quality of the compression casting concrete can be guaranteed to be high; the aggregates suitable for X-CT scanning imaging of compression casting concrete disclosed in the present invention include limestone, talc, rubber, and steel fiber; the method for selecting suitable aggregates disclosed in the present invention is applicable to all building aggregates, including but not limited to sedimentary rocks, metamorphic rocks, igneous rocks, metal ores, recycled aggregates, rubber, ceramics, artificial ceramsite, and artificial stone.

[0032] The technical solution of the present invention is described in detail with specific embodiments below. The following specific embodiments can be combined with each other, and the same or similar concepts or processes may not be described in detail in some embodiments.

[0033] The method for determining aggregate for compression casting concrete based on X-CT imaging according to a preferred embodiment of the present invention is as follows: Figure 1 As shown, the method for determining aggregates for compression casting concrete based on X-CT imaging includes the following steps:

[0034] In step S101, any aggregate is obtained.

[0035] In one implementation, the first aggregate includes one of quartz, limestone, talc, granite, and pebbles. Other types of materials include one of recycled aggregate, rubber fragments, artificial ceramsite, and steel fiber. It should be noted that the above-mentioned aggregates are only the aggregates used in the implementation cases of the present invention, and the first aggregate is applicable to all building aggregates in this professional field, including but not limited to sedimentary rocks, metamorphic rocks, igneous rocks, metal ores, ceramics, and artificial stones.

[0036] Specifically, Figure 2 and Figure 3 As shown, select any aggregate according to "Pebbles and Crushed Stones for Construction" GB / T14685-2011, "Code for Design of Building Foundations" GB 50007-2011 and "Code for Geotechnical Engineering Investigation" GB 50021-0009. Select fine aggregate according to "Sand for Construction" GB / T 14684-2011, use the selected aggregate to determine any mix ratio required for preparing concrete, then mix the concrete specimen, and screen the cement mortar.

[0037] In another implementation, the method for determining aggregates of compression cast concrete based on X-CT imaging also includes: obtaining a control aggregate, preparing a control concrete corresponding to the control aggregate, and calculating the specific gravity difference corresponding to the control concrete; performing X-CT scanning on the initial concrete and the control concrete, respectively, to obtain an initial image and a control image; performing reconstruction processing on the initial image and the control image, respectively, to obtain an initial reconstructed image corresponding to any one of the aggregates and a control reconstructed image corresponding to the control aggregate; and obtaining a corresponding relationship between the relative specific gravity difference and the X-CT imaging quality of concrete made using any one of the aggregates based on the relative specific gravity difference, the initial reconstructed image, the specific gravity difference, and the control reconstructed image.

[0038] That is, according to the density resolution principle of X-CT, the greater the density difference of the material, the more obvious the distinction between the materials. When the relative specific gravity difference q between the aggregate and the compression casting cement mortar is greater than 20%, the compression casting concrete X-CT imaging quality is high. Otherwise, the effect is not good. In this embodiment, the reference value R is 20%.

[0039] After determining the corresponding relationship, the initial reconstructed image is identified to obtain the distribution boundary characteristics of any aggregate and the cement mortar; and the reference value R corresponding to the target aggregate is determined according to the relative specific gravity difference q, the distribution boundary characteristics and the corresponding relationship.

[0040] It should be noted that the initial concrete and the control concrete use different coarse aggregates, but are prepared in the same way, and the calculation principle of the relative specific gravity difference corresponding to the initial concrete and the specific gravity difference corresponding to the control concrete is the same. The following steps will be described by taking the preparation of the initial concrete and the calculation of the relative specific gravity difference as an example, and the preparation of the control concrete and the calculation of the second specific gravity difference will not be repeated.

[0041] In step S102, initial concrete and cement mortar corresponding to any one of the aggregates are prepared.

[0042] In one implementation, in the process of preparing initial concrete and cement mortar, any mix ratio is obtained; according to any mix ratio, the required amounts of sand, water, cement and any aggregate are determined; the corresponding amounts of the sand, water, cement and any aggregate are mixed and stirred to obtain initial concrete, and part of the initial concrete is sieved using a standard square hole sieve with a pore size of 4.75 mm to obtain cement mortar.

[0043] It is worth noting that any aggregate obtained needs to prepare corresponding concrete and cement mortar, and any updated aggregate also needs to prepare corresponding concrete and cement mortar, but the obtained groups of cement mortars are the same in terms of physical properties. Specifically, this is because the influence of aggregate water absorption rate has been taken into account in the selected mix ratio, and concrete is prepared according to the saturated state of aggregate, thereby avoiding the influence of aggregate water absorption rate on the water content of cement mortar. On the other hand, the particle size of any aggregate is selected to be greater than 4.75mm, while the particle size of cement mortar is less than 4.75mm. Therefore, when screening, only cement mortar can pass through the sieve holes, so the physical and mechanical properties of the cement mortar obtained in the initial concrete are the same as those of the cement mortar obtained in the control concrete.

[0044] This embodiment uses a standard square hole sieve with a pore size of 4.75 mm for screening to ensure that the part passing through the square hole sieve is cement mortar.

[0045] Specifically, compression casting concrete and compression casting cement mortar of any aggregate are prepared. The concrete mix design strength grade is C30; the aggregates selected in the raw materials are granite, pebbles, quartz, limestone and talc; the particle size of all stones is 10-20mm; machine-made sand with a particle size less than 4.75mm, ordinary Portland cement PO.42.5 and tap water are used. The detailed mix design parameters are shown in Table 1. At the same time, recycled aggregate, rubber fragments, artificial ceramsite and steel fiber are selected and added to the concrete as reference. Conventional aggregate, special aggregate and other materials are shown in Figure 4 After the concrete mixing was completed, a part of it was used to prepare compression casting concrete specimens, and the other part of the concrete was sieved with a standard square hole sieve with an aperture of 4.75 mm to separate the cement mortar, which was used to prepare compression casting cement mortar specimens.

[0046] Table 1. Concrete mix ratio

[0047]

[0048] In step S103, the aggregate saturation specific gravity g corresponding to any one of the aggregates and the mortar saturation specific gravity s corresponding to the cement mortar are obtained.

[0049] In one implementation, the aggregate saturation specific gravity corresponding to any aggregate is expressed as:

[0050]

[0051] Where g represents the saturated specific gravity of aggregate, m s is the mass of any of the aggregates, m1 is the mass of the container and the water filling the container, m2 is the mass of the container and the mass of the container filled with any of the aggregates and water, G wt is the specific gravity of distilled water. (m1+m s -m2) represents the mass of water with the same volume as any aggregate. It should be noted that the calculation method of the saturated specific gravity s of mortar is consistent with the calculation method of the specific gravity g of aggregate, which will not be repeated here.

[0052] In step S104, the relative specific gravity difference q between any aggregate and the cement mortar is calculated according to the saturated specific gravity g of the aggregate and the saturated specific gravity s of the mortar; wherein the relative specific gravity difference q between any aggregate and the cement mortar corresponds to the X-CT imaging quality of the compressed cast concrete made using any aggregate.

[0053] In one implementation, in the calculation of the relative specific gravity difference q, the absolute value of the difference between the saturated specific gravity g of the aggregate and the saturated specific gravity s of the cement mortar is calculated; and the ratio of the absolute value to the saturated specific gravity of the mortar is calculated to obtain the relative specific gravity difference q.

[0054] The formula for the relative specific gravity difference is: q = (gs) / s;

[0055] Among them, q is the relative specific gravity difference, g is the saturated specific gravity of aggregate, and s is the saturated specific gravity of mortar.

[0056] Calculate the relative specific gravity difference q=(gs) / s between the saturated specific gravity of the aggregate and the saturated specific gravity of the mortar; if q≥R (R is a constant, which is the relative density difference that enables clear imaging of the aggregate in the compression cast concrete corresponding to the density resolution of the X-CT imaging device), then the aggregate is an aggregate selection suitable for the compression cast concrete formula that enables clear imaging of the aggregate on the corresponding X-CT device, that is, any of the aggregates is used as the target aggregate for the compression cast concrete.

[0057] It is worth noting that the saturated specific gravity of aggregates is to put all aggregates and test pieces into a container filled with water, soak for 3 hours and then measure the specific gravity. The test method of saturated specific gravity of mortar is consistent with that of aggregates. The relative specific gravity difference refers to the ratio of the absolute value of the difference between the saturated specific gravity of different types of aggregates and compressed cement mortar to the saturated specific gravity of compressed cement mortar, which is used to quantitatively describe the density difference between different types of aggregates and compressed cement mortar.

[0058] Specifically, after the specimens were prepared, they were placed in a curing room under standard conditions for 28 days. Then, under the same X-CT scanning conditions (current: 200 KV, voltage: 350 μA, exposure time 0.72 s, number of frames: 1440, number of image merging: 4, filter thickness: 0.5 mm, resolution: 38 μm), X-CT scanning and image reconstruction (number of image merging: 2, image size: 3072×3072×3072) were performed on the compression cast concrete specimens and compression cast cement mortar specimens with different types of aggregates. The reconstructed images are shown in the figure. Figure 5 The specific gravity of all aggregates and compression casting cement mortar was tested, and the results are shown in Table 2. Then the relative specific gravity difference between different types of aggregates and compression casting cement mortar was compared, and the calculation results are shown in Table 2. The relationship between the X-CT scanning imaging quality of compression casting concrete and the specific gravity of aggregates was evaluated, and the target aggregate that can improve the X-CT imaging quality of compression casting concrete was determined.

[0059] Table 2. Specific gravity test results of compression cast cement mortar specimens and different types of aggregates

[0060]

[0061] It is understood that the saturated specific gravity of aggregate refers to the mass per unit volume of a substance in a saturated state; while the relative specific gravity difference refers to the difference in the specific gravity of two or more substances when compared. In concrete science, this usually involves the comparison of the specific gravity of aggregate and cement mortar. For concrete, its internal structure is composed of different types of aggregates and cement mortar. The relative specific gravity difference of these materials will affect the overall density of concrete, resulting in different imaging contrast during X-CT scanning imaging. If the density difference between aggregate and cement mortar is large, then the interface between them will be easier to distinguish in X-CT imaging, thereby improving the imaging quality. By measuring the aggregate saturated specific gravity of different types of aggregates and cement mortar, their respective density information can be obtained. Then, the image data obtained by X-CT scanning is reconstructed in three dimensions using Voxel Studio Recon software, and the structural details inside the concrete can be intuitively observed. This process involves converting the scanned data into three-dimensional volume data for more in-depth analysis and evaluation.

[0062] In step S105, if the relative specific gravity difference q is greater than a reference value R, any one of the aggregates corresponding to the relative specific gravity difference q is used as a target aggregate for preparing compression casting concrete.

[0063] In this embodiment, the reference value R is 20%.

[0064] In another implementation, if the relative specific gravity difference q is less than a reference value R, any of the aggregates is updated to obtain an updated aggregate; the updated aggregate is used to prepare the initial concrete and the corresponding updated relative specific gravity difference q is calculated until the updated relative specific gravity difference q is greater than the reference value R, and the updated aggregate corresponding to the updated relative specific gravity difference q is used as the target aggregate for preparing compressed casting concrete.

[0065] Concrete is a multi-phase material composed of gravel, sand, cement, water and air. Figure 5As shown in the figure, for the compression cast concrete of granite stones and pebbles, the X-CT imaging quality is poor, that is, there is no obvious difference in the imaging grayscale value of cement mortar and aggregate, which can be attributed to the small relative specific gravity difference between aggregate and cement mortar (less than 20%), resulting in the inability to accurately distinguish the boundary between aggregate and cement mortar, aggregate size, and distribution of aggregate and cement mortar. For the compression cast concrete of quartz, limestone and talc, the compression cast limestone concrete has the highest X-CT imaging quality, and the shape, size, distribution of aggregate and cement mortar can be clearly seen. This is mainly due to the large relative specific gravity difference between limestone and cement mortar (greater than 20%). According to the density resolution principle of X-CT, the greater the density difference of a substance, the more obvious the distinction between substances, so the X-CT imaging clarity of compression cast limestone concrete is the best. The imaging clarity of talc is second, and the imaging clarity of quartz is poor. Therefore, based on the imaging quality, limestone or talc can be selected as the aggregate of compression cast concrete, so that the X-CT imaging quality is high.

[0066] For other types of materials, the X-CT imaging quality of compression cast recycled aggregate concrete, compression cast ceramsite concrete and compression cast cement mortar is poor, which is mainly due to the small relative specific gravity difference between aggregate and cement mortar (less than 20%), which makes it impossible to distinguish between aggregate and cement mortar. In the reconstructed images of compression cast rubber concrete and compression cast steel fiber concrete, the shape and distribution of rubber and steel fiber can be clearly seen. This is mainly because the specific gravity of rubber is less than that of cement mortar (the difference is 47.90%), which makes the gray value of rubber imaging smaller and the color darker. The specific gravity of steel fiber is much greater than that of cement mortar (the difference is 224.28%), which makes the gray value of steel fiber imaging larger and the color brighter.

[0067] That is to say, when the relative specific gravity difference between aggregate and compression casting cement mortar is greater than 20%, the compression casting concrete X-CT imaging quality is high. Otherwise, the effect is not good. The specific gravity results of other materials and the imaging quality of X-CT also further prove this point. Therefore, the relative specific gravity difference (20%) between aggregate and compression casting cement mortar can be used as a benchmark value for evaluating the imaging quality of compression casting concrete X-CT. When it is greater than 20%, the imaging quality is high; when it is less than 20%, the imaging quality is poor.

[0068] In one implementation, the method for determining aggregates for compression casting concrete based on X-CT imaging further includes: using the target aggregate as coarse aggregate to prepare compression casting concrete to obtain target concrete; and performing X-CT scanning on the target concrete to obtain a target X-CT image. Thus, the target X-CT image corresponding to the target concrete prepared using any determined aggregate has good imaging quality.

[0069] In summary, the method for determining aggregates of compression cast concrete based on X-CT imaging of the present invention obtains any kind of aggregate, prepares corresponding compression cast concrete and cement mortar, tests the specific gravity of the aggregate and cement mortar respectively, and calculates the relative specific gravity difference between the two; based on the X-CT imaging quality of compression cast concrete, if the relative specific gravity difference between the selected aggregate and cement mortar is greater than 20%, the aggregate of compression cast concrete with high X-CT imaging quality is obtained, and the requirement is met; if the relative specific gravity difference between the selected aggregate and cement mortar is less than 20%, the X-CT imaging quality of compression cast concrete is poor, and the requirement is not met. The present invention can improve the X-CT imaging quality of compression cast concrete by selecting suitable aggregates.

[0070] The specific implementation of the present invention is described below in conjunction with a specific application scenario.

[0071] K1. Select aggregates according to Pebbles and Crushed Stones for Construction GB / T 14685-2011, Code for Design of Building Foundations GB50007-2011 and Code for Geotechnical Engineering Investigation GB 50021-0009, select fine aggregates according to Sand for Construction GB / T 14684-2011, determine any concrete mix ratio, mix concrete specimens, and screen cement mortar.

[0072] K2. Prepare compression casting concrete and compression casting cement mortar according to the selected aggregate.

[0073] K3. After 28 days of curing under standard conditions in the curing room (temperature at 20±2℃, humidity not less than 95%), the compressed cast concrete specimens with different types of aggregates were subjected to X-CT scanning.

[0074] K4. Determine the aggregate saturation density of different types of aggregates and compressed cast cement mortar.

[0075] After K5 and X-CT scanning, the images were reconstructed using Voxel Studio Recon software to compare the relative specific gravity differences between different types of aggregates and compression-cast cement mortar, evaluate the relationship between the X-CT imaging quality of compression-cast concrete and the relative specific gravity difference, and determine the target aggregate that can improve the X-CT imaging quality of compression-cast concrete.

[0076] 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 conjunction with the embodiment or example are included in at least one embodiment or example of the present application. 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 may be combined in any one or N embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0077] Any process or method description in a flowchart or otherwise described herein may be understood to represent a module, fragment or portion of code comprising one or N executable instructions for implementing the steps of a custom logical function or process, and the scope of the preferred embodiments of the present application includes alternative implementations in which functions may not be performed in the order shown or discussed, including performing functions in a substantially simultaneous manner or in reverse order depending on the functions involved, which should be understood by technicians in the technical field to which the embodiments of the present application belong.

[0078] 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 storage 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 combination with these instruction execution systems, devices or apparatuses. For the purposes of this specification, a "computer-readable storage 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 combination with these instruction execution systems, devices or apparatuses. More specific examples (non-exhaustive list) of computer-readable storage media include the following: an electrical connection with one or N wirings (electronic device), a portable computer disk box (magnetic device), a random access memory (RAM), a read-only memory (ROM), an erasable and programmable read-only memory (EPROM or flash memory), a fiber optic device, and a portable compact disk read-only memory (CDROM). In addition, the computer-readable storage medium may even be paper or other suitable medium on which the program is printed, since the program can be obtained electronically by optically scanning the paper or other medium and then editing, interpreting or processing in other suitable ways as necessary, and then storing it in a computer memory.

[0079] It should be understood that the various parts of the present application can be implemented by hardware, software, firmware or a combination thereof. In the above-mentioned embodiment, the N 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.

[0080] A person skilled in the art may understand that all or part of the steps in the method for implementing the above-mentioned embodiment may be completed by instructing related hardware through a program, and the program may be stored in a computer-readable storage medium, which, when executed, includes one or a combination of the steps of the method embodiment.

[0081] In addition, each functional unit in each embodiment of the present application may be integrated into a processing module, or each unit may exist physically separately, or two or more units may be integrated into one module. The above-mentioned integrated module may be implemented in the form of hardware or in the form of a software functional module. If the integrated module is implemented in the form of a software functional module and sold or used as an independent product, it may also be stored in a computer-readable storage medium.

[0082] The storage medium mentioned above may be a read-only memory, a magnetic disk or an optical disk, etc. Although the embodiments of the present application have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limiting the present application. A person of ordinary skill in the art may change, modify, replace and modify the above embodiments within the scope of the present application.

[0083] It should be understood that the application of the present application is not limited to the above examples. For ordinary technicians in this field, improvements or changes can be made based on the above description. All these improvements and changes should fall within the scope of protection of the claims attached to this application.

[0084] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit it. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A method for determining aggregates for compression casting concrete based on X-CT imaging, characterized in that: The method for determining aggregate of compression cast concrete based on X-CT imaging includes: Get any aggregate; Prepare initial concrete and cement mortar corresponding to any one of the aggregates; Obtaining the aggregate saturation specific gravity corresponding to any one of the aggregates and the mortar saturation specific gravity corresponding to the cement mortar; Calculating the relative specific gravity difference between any one of the aggregates and the cement mortar according to the saturated specific gravity of the aggregate and the saturated specific gravity of the mortar; wherein the relative specific gravity difference corresponds to the X-CT imaging quality of concrete made using any one of the aggregates; If the relative specific gravity difference is greater than a reference value, any one of the aggregates corresponding to the relative specific gravity difference is used as a target aggregate for preparing compressed cast concrete; The saturated specific gravity of the aggregate corresponding to any one of the aggregates is expressed as: Where g represents the saturated specific gravity of aggregate, m s is the mass of any of the aggregates, m1 is the mass of the container and the water filling the container, m2 is the mass of the container and any of the aggregates and water filling the container, G wt is the specific gravity of distilled water; The method for determining aggregates for compression casting concrete based on X-CT imaging also includes: Obtaining a control aggregate, preparing a control concrete corresponding to the control aggregate, and calculating a specific gravity difference corresponding to the control concrete; wherein the control concrete is a concrete prepared in the same preparation method as the initial concrete, and any of the aggregates and the control aggregate are different coarse aggregates; the specific gravity difference is calculated in the same principle as the relative specific gravity difference; Performing X-CT scanning on the initial concrete and the control concrete respectively to obtain an initial image and a control image; Reconstructing the initial image and the reference image respectively to obtain an initial reconstructed image corresponding to any one of the aggregates and a reference reconstructed image corresponding to the reference aggregate; Obtaining a corresponding relationship between the relative specific gravity difference and the X-CT imaging quality of concrete made by using any of the aggregates according to the relative specific gravity difference, the initial reconstructed image, the specific gravity difference and the control reconstructed image; The method further comprises: obtaining a corresponding relationship between the relative specific gravity difference and the X-CT imaging quality of concrete made of any of the aggregates according to the relative specific gravity difference, the initial reconstructed image, the specific gravity difference and the control reconstructed image; and then: Identify the X-CT reconstructed images of the compressed cast concrete corresponding to different types of aggregates to obtain the distribution boundary characteristics of any aggregate and the cement mortar; The imaging quality of the X-CT reconstructed image of the compressed cast concrete corresponding to different types of aggregates and the corresponding relationship between the relative specific gravity difference between different types of aggregates and cement mortar are compared to determine the benchmark value corresponding to the target aggregate; wherein the imaging quality includes the distribution boundary characteristics of different types of aggregates and cement mortar.

2. The method for determining aggregates for compression casting concrete based on X-CT imaging according to claim 1, characterized in that: The reference value is 20%.

3. The method for determining aggregates of compression cast concrete based on X-CT imaging according to claim 1, characterized in that: The preparation of the initial concrete and cement mortar corresponding to any one of the aggregates specifically includes: Get any mix ratio; According to any of the mix ratios, determine the amounts of sand, water, cement and any of the aggregates required; The sand, the water, the cement and the any one of the aggregates are mixed and stirred in corresponding amounts to obtain initial concrete, and part of the initial concrete is sieved using a standard square hole sieve with a pore size of 4.75 mm to obtain cement mortar.

4. The method for determining aggregates for compression casting concrete based on X-CT imaging according to claim 1, characterized in that: The step of calculating the relative specific gravity difference between any one of the aggregates and the cement mortar according to the saturated specific gravity of the aggregate and the saturated specific gravity of the mortar specifically includes: Calculating the absolute value of the difference between the saturated specific gravity of the aggregate and the saturated specific gravity of the mortar; Calculating the ratio of the absolute value to the saturated specific gravity of the mortar to obtain a relative specific gravity difference; The formula for the relative specific gravity difference is: q = (gs) / s; Among them, q is the relative specific gravity difference, g is the saturated specific gravity of aggregate, and s is the saturated specific gravity of mortar.

5. The method for determining aggregates for compression casting concrete based on X-CT imaging according to claim 1, characterized in that: The method further comprises calculating the relative specific gravity difference between any one of the aggregates and the cement mortar according to the saturated specific gravity of the aggregate and the saturated specific gravity of the mortar, and then: If the relative specific gravity difference is less than the reference value, any of the aggregates is updated to obtain an updated aggregate; The updated any one of the aggregates is used to prepare the initial concrete and the corresponding updated relative specific gravity difference is calculated until the updated relative specific gravity difference is greater than the reference value, and the updated any one of the aggregates corresponding to the updated relative specific gravity difference is used as the target aggregate for preparing the compressed cast concrete.

6. The method for determining aggregates for compression casting concrete based on X-CT imaging according to claim 1, characterized in that: Any of the aggregates is one of quartz, limestone, talc, granite, pebbles, recycled aggregate, rubber crumbs, artificial ceramsite and steel fiber.

7. The method for determining aggregates for compression casting concrete based on X-CT imaging according to claim 1, characterized in that: If the relative specific gravity difference is greater than the reference value, any of the aggregates corresponding to the relative specific gravity difference is used as the target aggregate for preparing the compressed cast concrete, and then the method further includes: Using the target aggregate as coarse aggregate to prepare compression casting concrete to obtain target concrete; Perform X-CT scanning on the target concrete to obtain a target X-CT image.

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