Concrete homogeneity detection method based on aggregate distribution

Abstract

The invention provides a concrete homogeneity detection method based on aggregate distribution, and the method specifically comprises the following steps: preparing two electrode wires with a fixed interval, respectively connecting the two electrode wires to a detection device, and arranging the detection device between two steel bars with an interval; a plurality of groups of electrode wires which are arranged up and down are arranged on the detection device on a poured vertical interface; any two opposite electrode wires at the same height are connected into a data remote feedback system at the same time, and collected data are remotely checked; concrete is poured into the reinforcement cage, auxiliary vibration operation is adopted, and a resistance value feedback signal after vibration is collected; observing the software processing system; after the test is finished, the electrode wire is cut off to serve as a reinforcing rib structure. According to the concrete homogeneity detection method based on aggregate distribution, the homogeneity of the concrete can be tested at low cost when the concrete is poured and before the concrete is hardened, and meanwhile the homogeneity of the concrete is improved through comprehensive treatment of concrete modification and electric pulse.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of concrete detection, and particularly relates to a concrete homogeneity detection method based on aggregate distribution. BACKGROUND

[0002] As a core material of construction engineering, the homogeneity of concrete before hardening directly determines the strength, durability and impermeability of the structure. When the composition and dosage of the concrete material are the same, the performance depends on the homogeneity. In the construction process, local defects caused by insufficient vibration, aggregate segregation or bleeding may cause cracks and leakage. Severe segregation causes the concrete structure to be layered, greatly reducing the strength and performance of the concrete structure, and even causing structural failure. However, the existing detection technology cannot evaluate the homogeneity of the concrete in real time and comprehensively before the concrete hardens, resulting in quality problems often being exposed in the form removal or later detection, causing high repair costs and delay in construction period. Due to the large slump of the concrete, over-vibration is common on site, and unevenness will exist in various parts of the solid structure. And this unevenness will affect the strength and durability of the concrete.

[0003] Concrete unevenness is often discovered after hardening, and even after hardening. Due to the influence of the material falling point, pile diameter and concrete workability, the structure such as the pier column may have concrete unevenness at different heights, and concrete unevenness at the same height on four faces. Concrete unevenness (especially when the aggregate is less and the paste is more) can cause the following problems:

[0004] (1) More paste and less aggregate, greater concrete shrinkage, and easy cracking;

[0005] (2) More paste and less aggregate, poor concrete impermeability, and reduced protection function of the steel bar;

[0006] (3) More paste and less aggregate, resulting in lower elastic modulus of the concrete;

[0007] (4) The cracking of the concrete will seriously affect the protection function of the steel bar.

[0008] Therefore, how to test the homogeneity of the concrete at the time of pouring and before hardening at a low cost has become a technical problem to be solved by the present application. SUMMARY

[0009] The application aims to provide a concrete homogeneity detection method based on aggregate distribution, which solves the technical problem of how to test the homogeneity of the concrete at the time of pouring and before hardening at a low cost. At the same time, through the comprehensive treatment of concrete modification and electric pulse, the homogeneity of the concrete is improved, and the mechanical properties are improved.

[0010] A concrete homogeneity detection method based on aggregate distribution, specifically comprising the following steps:

[0011] Step S1: Prepare two electrode wires with fixed intervals, respectively connected to the detection device, which is arranged between two steels with intervals;

[0012] Step S2: At the vertical interface of pouring, a plurality of groups of electrode wires arranged in up and down are arranged on the detection device, and each group of electrode wires contains two electrode wires. Multiple electrode groups are located at different detection depths h positions;

[0013] Step S3: Simultaneously connect any two electrode wires at the same height to the data remote feedback system, remotely view the collected data, and select Bluetooth or Internet for data transmission;

[0014] Step S4: Pour the concrete into the reinforcement cage and use auxiliary vibration operation to collect the resistance value feedback signal after vibration;

[0015] Step S5: Observe the software processing system, when the resistance value deviation of different test points at the same vertical depth exceeds 10%, the data alarm, if not more than 10%, take the average value;

[0016] Step S6: Repeat the above operation for the remaining electrode wires at different detection depths h, and alarm when the average value deviation of multiple data between different detection depths h exceeds 15%;

[0017] Step S7: After the test is completed, the electrode wires are cut off, the sampling structure in the detection device is taken out for testing, and then the sampling structure is put back into the detection device. The electrode wires and the detection device are immersed in the concrete to act as reinforcing structures.

[0018] In step S1, the interval between the two adjacent steels is 10-40 cm, and the interval between the two adjacent electrodes is 5-20 cm.

[0019] In step S1, before testing, the electrode material is pre-polarized, and AC multi-frequency excitation combined with carbon fiber electrode is used to suppress polarization effect, with an error of <3% within 30 minutes.

[0020] In step S5, if the data alarm, the electrode wires at the same depth are connected to the electric pulse circuit to perform electric pulse treatment on the whole concrete; after electric pulse treatment, the resistance value is tested again until the data alarm stops; wherein the electric pulse intensity is 5-8V / cm, and the pulse width is 20-30 microseconds.

[0021] In step S4, the concrete, by mass fraction, comprises a mixture of 25%-30% cementitious material, 30%-35% coarse aggregate, 25%-30% fine aggregate, 0.2%-0.6% water-reducing agent, and 10%-15% water; the cementitious material comprises 15%-20% mineral powder, 10%-15% fly ash, and the remainder is cement.

[0022] The coarse aggregate has a particle size of 15-30 mm, and the fine aggregate has a particle size of 0.2-3.5 mm and a fineness modulus of 2.5-3.0.

[0023] By mass, coarse aggregate / (fine aggregate + water-reducing agent) = 0.98-1.4.

[0024] In step S4, warm wheel adhesive, nano SiO2 sol and indented PP fiber are added to the concrete. The mass fractions of warm wheel adhesive, nano SiO2 sol and indented PP fiber in the concrete are 5%-8%, 4%-6% and 0.8%-1.2%, respectively.

[0025] By mass, (warm wheel adhesive + nano SiO2 sol): scoring PP fiber = 10-15.

[0026] A concrete homogeneity testing device based on aggregate distribution includes a horizontally arranged column, fastening plates fixed at both ends of the column, a vertical cylinder whose bottom end is threadedly connected to the side of the column, and a sampling column vertically inserted into the vertical cylinder. The outer side of the vertical cylinder has multiple through holes, and the outer side of the sampling column has multiple blind holes, which are aligned with the through holes.

[0027] Multiple insulating posts are provided on the outer side of the vertical cylinder. The insulating posts are fixedly connected to one end of the electrode wire and are located close to the through hole.

[0028] For any technical details not described in detail in this solution, the implementation of this solution can be based on the conventional understanding and operation of those skilled in the art. The types of materials involved are also based on the general application knowledge of those skilled in the art and will not be described in detail here.

[0029] The positive effects of this invention are as follows:

[0030] (1) This solution solves the problem of testing the homogeneity of fresh concrete. It can detect the homogeneity problem of concrete in advance during construction, reduce the need for vibration adjustment in concrete construction due to poor homogeneity, and adjust various factors such as the compatibility between admixtures, cement, and additives, paste-aggregate ratio, sand ratio, aggregate gradation and mixing process; ultimately avoid rework and reconstruction caused by poor concrete homogeneity.

[0031] This solution not only enables the detection of concrete homogeneity, but is also expected to increase concrete strength by 20%, reduce crack formation, and extend the service life of structures by 10-15 years.

[0032] (2) The electrode wires used in this scheme have the following technical advantages:

[0033] First, an external circuit is connected to a remote data feedback system to test the resistance of the concrete.

[0034] Secondly, after the resistance test is completed, the resistance wire is cut off. The remaining resistance wire in the concrete acts as a reinforcing bar, which helps to increase the overall strength of the concrete.

[0035] Third, the electrode wire can be connected to the electrical pulse circuit. Low voltage and short pulses can promote hydration and repair; and drive the migration of charged ions, causing cement particles to be arranged more tightly, reducing porosity, and thus improving density; in addition, applying electrical pulses can promote electrochemical deposition (such as CaCO3), fill cracks, and restore structural integrity.

[0036] (3) This solution incorporates warm wheel adhesive, nano-SiO2 sol, and insulating etched PP fiber, achieving the following technical effects:

[0037] First, the polymer chains in the thermal grease form a three-dimensional network that encapsulates free water, reducing the bleeding rate to 0.1-0.3%, while the bleeding rate of benchmark concrete is 2-5%.

[0038] Secondly, nano-SiO2 sol is used as an interface strengthening agent. 10-20nm particles fill the cement pores, reducing the thickness of the interface transition zone from 45μm to 21μm.

[0039] Third, the surface markings on the scribbled PP fibers increase the fiber-slurry bonding strength by 60%, specifically from 0.32 MPa to 0.512 MPa;

[0040] Fourth, the addition of warm wheel adhesive, nano SiO2 sol and insulating notched PP fiber also helps to improve the overall bonding strength of concrete and greatly improves the mechanical properties of concrete.

[0041] (4) In this scheme, the testing device is designed with the sampling column sliding up and down in the vertical cylinder, and the through hole and blind hole are aligned. This not only serves the purpose of sampling, but also allows the sampling column to be placed in the vertical cylinder after sampling, so that the entire testing device can be used as a reinforcing rib structure and immersed in the concrete.

[0042] (5) In this scheme, through the improvement of device design, composition and testing methods, it is not only convenient to sample and test the uniformity of concrete, but also improves the uniformity of concrete and improves the mechanical properties of concrete, thus avoiding cracking of concrete. Attached Figure Description

[0043] Figure 1 This is a schematic diagram of the detection device in Embodiment 4 of the present invention.

[0044] Figure 2 This is a schematic diagram of the connection structure between the sampling column and the vertical cylinder in Embodiment 4 of the present invention.

[0045] Figure 3 This is a schematic diagram illustrating the relationship between resistivity and aggregate ratio in Embodiment 3 of the present invention.

[0046] Figure 4 This is a schematic diagram illustrating the coupling principle of the warm wheel adhesive, nano-SiO2 sol, and etched PP fiber in Embodiment 2 of the present invention.

[0047] The attached diagram is labeled as follows: 1. Reinforcing bar; 2. Fastening plate; 3. Horizontal column; 4. Vertical cylinder; 41. External thread; 42. Through hole; 43. Blind hole; 5. Electrode wire; 51. Insulating column; 6. Sampling column. Detailed Implementation

[0048] To more clearly illustrate the technical features of this solution, the following detailed implementation method will be used to explain the solution.

[0049] Example 1

[0050] A method for detecting the homogeneity of concrete based on aggregate distribution, specifically including the following steps:

[0051] Step S1: Prepare two electrode wires 5 with a fixed spacing and connect them to the detection device. The detection device is set between two steel bars 1 with a spacing.

[0052] Step S2: On the vertical interface of the casting, several sets of electrode wires 5 arranged vertically are set on the detection device. Each set of electrode wires 5 contains two, and multiple sets of electrodes are located at different detection depths h.

[0053] Step S3: Connect two electrode wires 5 at any opposite height to the remote data feedback system simultaneously, view the collected data remotely, and select Bluetooth or Internet for data transmission.

[0054] Step S4: Pour the concrete into the reinforcing cage, use auxiliary vibration operation, and collect the resistance value feedback signal after vibration;

[0055] Step S5: Observe the software processing system. When the resistance value deviation of different test points at the same vertical depth exceeds 10%, a data alarm will be triggered. If it does not exceed 10%, the average value will be taken.

[0056] For example, when testing the resistivity at 10cm, 30cm, and 50cm, although factors such as aggregate, pouring time, and hydration process also affect the resistivity, at the same vertical interface, the value should only be related to the concrete performance.

[0057] Step S6: Repeat the above operation for the remaining electrode wires 5 at different detection depths h. An alarm will be triggered when the average deviation of multiple data points between different detection depths h exceeds 15%.

[0058] Step S7: After the test is completed, cut the electrode wire 5, take out the sampling structure from the testing device for testing, and then put the sampling structure back into the testing device. The electrode wire 5 and the testing device are both immersed in the concrete, acting as a reinforcing rib structure.

[0059] In step S1, the distance between two adjacent steel bars 1 is 10cm, and the distance between two adjacent electrodes is 5cm.

[0060] In step S1, before testing, the electrode material is pre-antipolarized by using AC multi-frequency excitation combined with carbon fiber electrodes to suppress the polarization effect and achieve an error of <3% within 30 minutes.

[0061] In step S5, if an alarm is triggered, electrode wire 5 at the same depth is connected to the electrical pulse circuit to perform electrical pulse processing on the entire concrete structure. After the electrical pulse processing, the resistance value is tested again until the alarm stops. The electrical pulse intensity is 5V / cm, and the pulse width is 20 microseconds.

[0062] In step S4, by mass fraction, the concrete comprises a mixture of 25%-30% cementitious materials, 30%-35% coarse aggregate, 25%-30% fine aggregate, 0.2%-0.6% water-reducing agent, and 10%-15% water; the cementitious materials comprise 15%-20% mineral powder, 10%-15% fly ash, and the remainder is cement.

[0063] The coarse aggregate has a particle size of 15-30mm, and the fine aggregate has a particle size of 0.2-3.5mm and a fineness modulus of 2.5-3.0.

[0064] By mass, coarse aggregate / (fine aggregate + water-reducing agent) = 0.98-1.4.

[0065] To investigate the influence of concrete composition on concrete homogeneity, three experimental groups were designed as follows. In all three groups, the cement, mineral powder, and fly ash content of the cementitious materials were taken as the median values ​​of their respective ranges: cement 71%, mineral powder 17%, and fly ash 12%; the remaining values ​​were variables. The copper electrode spacing was 200 mm. Table 1 shows the resistance test results for each experimental group (without electrical pulses), and Table 2 shows the resistance test results for each experimental group (with electrical pulses). Parameter values ​​not explicitly described in Example 1 were calculated based on the minimum value within their respective ranges.

[0066] Experimental Group A: 30% coarse aggregate, 30% fine aggregate, 0.2% water-reducing agent, and the remainder water;

[0067] Experimental Group B: 32% coarse aggregate, 28% fine aggregate, 0.5% water-reducing agent, and the remainder is water;

[0068] Experimental group C: 35% coarse aggregate, 25% fine aggregate, 0.6% water-reducing agent, and the remainder is water;

[0069] Experimental group D: 35% coarse aggregate, 25% fine aggregate, no water-reducing agent, the remainder is water;

[0070] Experimental group E contains no coarse aggregate, fine aggregate, or water-reducing agent, and serves as a comparative case.

[0071] Table 1 shows the resistance test results for each test group under no-electric-pulse conditions.

[0072] Concrete depth h Test group A (resistance Ω) Test group B (resistance Ω) Test group C (resistance Ω) Test group D (resistance Ω) Test group E (resistance Ω) 10 cm 195 212 224 241 191 30 cm 198 218 228 262 203 50 cm 206 224 237 289 219

[0073] As shown in Table 1, the test resistance gradually increases with the increase of coarse aggregate and water-reducing agent, and with the decrease of fine aggregate. When the water-reducing agent is removed, the increase in resistance is significantly greater, indicating that the water-reducing agent helps reduce the resistance of concrete. The increase in resistance due to coarse aggregate is significantly greater than that due to fine aggregate. For test group AC, the resistance values ​​at the same depth are relatively uniform, while the resistance values ​​of test groups D and E at different depths show a large difference and are less uniform. Therefore, the addition of coarse aggregate, fine aggregate, and water-reducing agent in this scheme, working together, increases the uniformity of concrete.

[0074] The reason for testing the resistance value in this scheme is to indirectly verify the strength change law of concrete. When the main components remain unchanged, a larger resistance value indicates that there may be more cracks in the concrete. The smaller the resistance value, the fewer cracks there may be and the higher the strength. This has been verified in practice. This scheme can be understood as a qualitative analysis of the mechanical properties of concrete and does not involve the main invention experiments.

[0075] Regarding the resistivity values ​​at different concrete depths, the resistivity increases with increasing depth, which is actually due to the large amount of coarse aggregate settling. Therefore, while ensuring concrete strength, the content of fine aggregate and water-reducing agent should be increased as much as possible, while reducing the content of coarse aggregate.

[0076] Table 2 shows the resistance test results for each test group when an electrical pulse is added.

[0077] Concrete depth h Test group A (resistance Ω) Test group B (resistance Ω) Test group C (resistance Ω) Test group D (resistance Ω) Test group E (resistance Ω) 10 cm 196 212 224 244 193 30 cm 198 216 227 258 201 50 cm 204 219 231 279 215

[0078] As can be seen from Table 2, when the electrical pulse is added, the uniformity of the resistance values ​​in each test group is improved to a certain extent, and the shallower the concrete depth h, the better the improvement in uniformity.

[0079] Example 2

[0080] See Figure 4 In step S4, warm wheel adhesive, nano SiO2 sol and indented PP fiber are added to the concrete. The mass fractions of warm wheel adhesive, nano SiO2 sol and indented PP fiber in the concrete are 5%-8%, 4%-6% and 0.8%-1.2%, respectively.

[0081] By mass, (warm wheel adhesive + nano SiO2 sol): scoring PP fiber = 10-15.

[0082] To investigate the effect of concrete composition on concrete homogeneity, three experimental groups were designed. In all three groups, the cement, mineral powder, and fly ash content of the cementitious materials were taken as the median values ​​of their respective ranges: cement 71%, mineral powder 17%, and fly ash 12%; the remaining values ​​were variables. The copper electrode spacing was 200 mm. Table 3 shows the resistance test results for each experimental group without an electrical pulse.

[0083] Experimental group 1: 5% warm wheel adhesive, 4% nano-SiO2 sol, 0.8% scoring PP fiber, and the remainder was water;

[0084] Experimental Group 2: 7% warm wheel adhesive, 5% nano-SiO2 sol, 1.2% scoring PP fiber, and the remainder was water;

[0085] Experimental Group 3: 8% warm wheel adhesive, 6% nano-SiO2 sol, 1.0% scoring PP fiber, and the remainder was water;

[0086] Table 3 shows the resistance test results for each test group under no-electric-pulse conditions.

[0087] Concrete depth h Test group 1 (resistance Ω) Test group 2 (resistance Ω) Test group 3 (resistance Ω) 10 cm 204 217 229 30 cm 207 220 232 50 cm 211 222 233

[0088] As can be seen from Table 3, with the addition of warm wheel adhesive, nano SiO2 sol and notched PP fiber, the resistance value does not change much from the test data. This indicates that the three components of warm wheel adhesive, nano SiO2 sol and notched PP fiber work together to improve the uniformity of concrete.

[0089] Furthermore, the resistance value generally increased in Example 2. This is because the effects of the warm wheel adhesive, nano-SiO2 sol, and notched PP fibers on the concrete resistance value exhibit a complex "two increases and one decrease" effect. Specifically, the warm wheel adhesive and notched PP fibers increase resistance by blocking the conductive path, while the nano-SiO2 sol may decrease resistance due to the introduction of an ion carrier. See also Figure 4 This is a schematic diagram illustrating the working principle of the warm wheel adhesive, nano-SiO2 sol, and indented PP fiber in this scheme to increase the uniformity of concrete.

[0090] Example 3

[0091] The effect of cementitious material content on the resistivity of concrete was also experimentally verified in Example 3. In Example 3, the cement, mineral powder, and fly ash in the cementitious materials were all taken as the midpoint of their respective ranges, i.e., 71% cement, 17% mineral powder, and 12% fly ash. The proportions of cementitious materials in the concrete were adjusted; see Appendix for details. Figure 3 It can be seen that when the proportion of cementitious materials in concrete exceeds 25%, the decrease in the resistance value of concrete gradually becomes less obvious and gradually tends to a stable value. Therefore, considering the cost, it is reasonable to set the proportion of cementitious materials in concrete to 25-30% in this scheme.

[0092] It should be noted that neat cement paste refers to a liquid mixture formed by mixing cement and water in a certain proportion. Other auxiliary materials are usually used to adjust its properties. In this scheme, neat cement paste can also be understood as the cementing material in this scheme.

[0093] Example 4

[0094] See Figures 1-2 A concrete homogeneity testing device based on aggregate distribution includes a horizontally arranged horizontal column 3, fastening plates 2 fixed at both ends of the horizontal column 3, a vertical cylinder 4 whose bottom end is threadedly connected to the side of the horizontal column 3, and a sampling column 6 vertically inserted into the vertical cylinder 4. The outer side of the vertical cylinder 4 is provided with multiple through holes 42, and the outer side of the sampling column 6 is provided with multiple blind holes 43, which are aligned with the through holes 42. The bottom end of the vertical cylinder 4 is provided with an external thread 41 for connection.

[0095] Multiple insulating posts 51 are provided on the outer side of the vertical cylinder 4. The insulating posts 51 are fixedly connected to one end of the electrode wire 5 and are located near the through hole 42.

[0096] The specific working process of this invention:

[0097] In this scheme, electrode wire 5 is connected to an external circuit, which is connected to a remote data feedback system to test the resistance of concrete.

[0098] After the resistance test is completed, the resistance wire is cut off. The remaining wire in the concrete acts as a reinforcing bar, which helps to increase the overall strength of the concrete.

[0099] Electrode wire 5 can be connected to an electrical pulse circuit. Low voltage and short-duration pulses can promote hydration and repair; drive the migration of charged ions, promote the closer arrangement of cement particles, reduce porosity, and thus improve density; in addition, applying electrical pulses can promote electrochemical deposition (such as CaCO3), fill cracks, and restore structural integrity.

[0100] In this design, a testing device is installed with a sampling column 6 that slides up and down in a vertical cylinder 4. The through hole 42 and the blind hole 43 are aligned. This not only serves the purpose of sampling, but also allows the sampling column 6 to be placed in the vertical cylinder 4 after sampling, so that the entire testing device acts as a reinforcing structure and is immersed in the concrete.

[0101] The technical features of this invention not described can be implemented by or using existing technology, and will not be repeated here. Of course, the above description is not a limitation of this invention, and this invention is not limited to the examples above. Any changes, modifications, additions or substitutions made by those skilled in the art within the scope of this invention should also be within the protection scope of this invention.

Claims

1. A method for detecting the homogeneity of concrete based on aggregate distribution, characterized in that, Specifically, the steps include the following: Step S1: Prepare two electrode wires (5) with a fixed spacing and connect them to the detection device. The detection device is set between two steel bars (1) with a spacing. Step S2: On the vertical interface of the casting, several sets of electrode wires (5) arranged vertically are set on the detection device. Each set of electrode wires (5) contains two, and multiple sets of electrodes are located at different detection depths h. Step S3: Connect two electrode wires (5) that are opposite each other and at the same height to the remote data feedback system at the same time, view the collected data remotely, and select Bluetooth or Internet for data transmission; Step S4: Pour the concrete into the reinforcing cage, use auxiliary vibration operation, and collect the resistance value feedback signal after vibration; Step S5: Observe the software processing system. When the resistance value deviation of different test points at the same vertical depth exceeds 10%, a data alarm will be triggered. If it does not exceed 10%, the average value will be taken. Step S6: Repeat the above operation for the remaining electrode wires (5) at different detection depths h. An alarm will be triggered when the average deviation of multiple data values ​​between different detection depths h exceeds 15%. Step S7: After the test is completed, cut the electrode wire (5), take out the sampling structure from the testing device for testing, and then put the sampling structure back into the testing device. The electrode wire (5) and the testing device are both immersed in the concrete to act as a reinforcing rib structure.

2. The method for detecting the homogeneity of concrete based on aggregate distribution according to claim 1, characterized in that, In step S1, the distance between two adjacent steel bars (1) is 10cm-40cm, and the distance between two adjacent electrodes is 5-20cm.

3. The method for detecting the homogeneity of concrete based on aggregate distribution according to claim 1, characterized in that, In step S1, before testing, the electrode material is pre-antipolarized by using AC multi-frequency excitation combined with carbon fiber electrodes to suppress the polarization effect and achieve an error of <3% within 30 minutes.

4. The method for detecting the homogeneity of concrete based on aggregate distribution according to claim 3, characterized in that, In step S5, if the data alarm is triggered, the electrode wire (5) at the same depth is connected to the electrical pulse circuit to perform electrical pulse processing on the entire concrete; after the electrical pulse processing, the resistance value is tested again until the data alarm stops. The electrical pulse intensity is 5-8V / cm, and the pulse width is 20 to 30 microseconds.

5. The method for detecting the homogeneity of concrete based on aggregate distribution according to claim 3, characterized in that, In step S4, the concrete, by mass fraction, comprises a mixture of 25%-30% cementitious material, 30%-35% coarse aggregate, 25%-30% fine aggregate, 0.2%-0.6% water-reducing agent, and 10%-15% water; the cementitious material comprises 15%-20% mineral powder, 10%-15% fly ash, and the remainder is cement. The coarse aggregate has a particle size of 15-30 mm, and the fine aggregate has a particle size of 0.2-3.5 mm and a fineness modulus of 2.5-3.

0. By mass, coarse aggregate / (fine aggregate + water-reducing agent) = 0.98-1.

4.

6. The method for detecting the homogeneity of concrete based on aggregate distribution according to claim 5, characterized in that, In step S4, warm wheel adhesive, nano SiO2 sol and indented PP fiber are added to the concrete. The mass fractions of warm wheel adhesive, nano SiO2 sol and indented PP fiber in the concrete are 5%-8%, 4%-6% and 0.8%-1.2%, respectively.

7. The method for detecting the homogeneity of concrete based on aggregate distribution according to claim 6, characterized in that, By mass, (warm wheel adhesive + nano SiO2 sol): scoring PP fiber = 10-15.

8. A concrete homogeneity testing device based on aggregate distribution, employing the concrete homogeneity testing method based on aggregate distribution as described in any one of claims 1-7, characterized in that, The device includes a horizontally arranged horizontal column (3), fastening plates (2) fixed at both ends of the horizontal column (3), a vertical cylinder (4) whose bottom end is threadedly fixed to the side of the horizontal column (3), and a sampling column (6) vertically inserted into the vertical cylinder (4). The outer side of the vertical cylinder (4) is provided with multiple through holes (42), and the outer side of the sampling column (6) is provided with multiple blind holes (43). The blind holes (43) are aligned with the through holes (42). Multiple insulating posts (51) are provided on the outside of the vertical cylinder (4). The insulating posts (51) are fixedly connected to one end of the electrode wire (5). The insulating posts (51) are located near the through hole (42).

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