Method and testing device for rapid quantitative evaluation of flow performance of hydraulic concrete at actual time of entering mold

Abstract

This invention relates to a rapid quantitative evaluation method and testing device for simulating the flowability of hydraulic concrete at the actual moment of placement in the formwork, comprising the following steps: (1) adjusting the testing device for the flowability of hydraulic concrete; (2) conducting the test and measuring the weight of the concrete bucket at each stage of the test; (3) calculating the quantitative evaluation index of the flowability of hydraulic concrete based on the weight of the concrete bucket at each stage measured in step (2). The testing device includes a concrete silo, freshly mixed concrete to be tested, silo baffle, laser induction timer, fixed hinge support, high-strength bolts, support platform, concrete bucket, weighing machine, reinforcing bars and vibrator. Using this method and device, the flowability test of hydraulic concrete at the actual moment of placement in the formwork can be carried out simply and quickly, and the flowability of hydraulic concrete at the actual moment of placement in the formwork can be evaluated accurately and realistically, overcoming the shortcomings of traditional methods that do not conduct tests on the flowability of hydraulic concrete at the actual moment of placement in the formwork and lack quantitative evaluation indexes for flowability.

Description

Technical Field

[0001] This invention relates to the field of testing and evaluation of the flowability of hydraulic concrete, specifically a rapid quantitative evaluation method and testing device for simulating the actual flowability of hydraulic concrete at the moment of pouring into the mold. Background Technology

[0002] In the structural construction of waterway engineering projects, to ensure the uniformity and density of the concrete structure, freshly mixed hydraulic concrete must possess good flowability. Freshly mixed hydraulic concrete with poor flowability will exhibit viscous clumping or segregation and bleeding, severely affecting the uniformity and density of the concrete structure during pouring and after hardening.

[0003] Therefore, to ensure the construction quality of waterway projects and improve the flowability and uniformity of concrete at the construction site, it is necessary to conduct a true and accurate quantitative assessment of the flowability of freshly mixed hydraulic concrete at the moment of actual pouring and placement. Currently, the testing method for concrete flowability at construction sites is usually based on the slump test, measuring the spread and slump of freshly mixed concrete, and then combining this with empirical methods to comprehensively evaluate the state of concrete flowability. The slump test is suitable for ordinary concrete with a crushed stone gradation of less than 40cm. However, for freshly mixed hydraulic concrete with a crushed stone gradation greater than 40cm, it is necessary to sieve out stones larger than 40cm before using the slump test, which increases the workload of flowability testing. Furthermore, this testing method is only performed in the laboratory during the mixing and unloading stage, and does not test and evaluate the flowability of hydraulic concrete after pouring and vibration through the reinforcing mesh at the moment of actual placement.

[0004] Traditional methods for testing and evaluating the flowability of concrete can roughly assess the flowability of hydraulic concrete, but they are labor-intensive, the evaluation parameters are coarse and inaccurate, and they can only analyze the flowability of hydraulic concrete at the mixing and discharging stage after removing aggregate larger than 40cm. They cannot quickly complete the test and make a quantitative assessment. This results in the flowability of fresh hydraulic concrete not being monitored and fed back in a timely manner during the transportation and vibration pouring process, and consequently, the flowability of fresh hydraulic concrete cannot be accurately controlled according to its actual flow state at the time of placement in the formwork. Summary of the Invention

[0005] To accurately and quantitatively assess the flowability of hydraulic concrete at construction sites and overcome the limitations of traditional hydraulic concrete flowability testing, this invention provides a rapid quantitative assessment method and testing device that simulates the actual flowability of hydraulic concrete at the moment of pouring. This facilitates on-site construction personnel in testing and evaluating the flowability of fully graded hydraulic concrete after vibration and pouring. By measuring the weight of freshly mixed concrete discharged within 7 seconds, the flowability assessment index of the freshly mixed hydraulic concrete is calculated, enabling an accurate evaluation of the flowability of hydraulic concrete at construction sites.

[0006] This invention achieves the above objective through the following technical solution: a rapid quantitative evaluation method for simulating the flowability of hydraulic concrete at the actual moment of pouring, comprising the following steps:

[0007] (1) Test device for adjusting the flow performance of hydraulic concrete: Find a level test platform by using a level, place the concrete test device on the level platform, turn on the electronic scale and tare and zero it, weigh the concrete bucket to observe the weighing accuracy of the weighing machine. After confirming that it meets the weighing requirements, fix the concrete silo on the support platform and close the silo baffle.

[0008] (2) Record the weight of the concrete bucket at each stage of the flow performance test: Place the concrete bucket on the weighing machine and set it to zero and tare. Pour the uniformly prepared fresh concrete to be tested into the concrete bucket and stir it evenly. The weighing scale is W1. Connect the upper end of the concrete silo to the high-strength bolt to adjust the test angle and close the concrete silo baffle. Then, gradually pour the fresh concrete to be tested from the concrete bucket into the concrete silo evenly within 1 minute. Use a vibrator to vibrate the hydraulic concrete through the steel bar. After pouring and vibrating, scrape off the excess concrete on the surface of the silo with a scraper and vibrate it fully. Collect the scraped concrete and pour it back into the concrete bucket. The weighing scale is W2. Scrape the concrete on the top surface of the concrete silo and let it stand for 3 seconds. Open the lower baffle of the concrete silo. Start timing at the same time as the fresh concrete to be tested leaks out. When the time reaches 7 seconds, immediately close the lower baffle of the concrete silo to prevent the concrete from falling further. Record the value displayed on the weighing machine at this time, W3.

[0009] (3) Based on the weight of each concrete mixture measured in step (2), calculate the quantitative evaluation index of the flowability of hydraulic concrete: Combine the weight values ​​of the concrete buckets at each stage obtained from each test experiment, calculate the quantitative evaluation index of the flowability of hydraulic concrete under the test angle.

[0010] The specific calculation formula for the quantitative evaluation index of the flowability performance of hydraulic concrete is as follows:

[0011]

[0012] In the formula, W1 is the weight of the freshly mixed concrete to be tested; W2 is the weight of the concrete in the concrete bucket after the concrete silo is filled and leveled; W3 is the weight of the concrete in the bucket 7 seconds after the concrete is poured from the silo; η is the evaluation index of the flowability of hydraulic concrete under the test angle, and the value of η is 0 < η < 1, where the larger the value of η, the better the flowability of the concrete.

[0013] An apparatus for rapidly and quantitatively evaluating the flowability of simulated hydraulic concrete at the moment of actual pouring into the formwork includes a concrete silo, freshly mixed concrete to be tested, a silo baffle, a laser sensor timer, a fixed hinge support, high-strength bolts, a support platform, a concrete bucket, a weighing machine, reinforcing bars, and a vibrator. The support platform is placed on a horizontal surface. The upper end of the concrete silo is connected to the support platform via high-strength bolts, and the lower end of the concrete silo is connected to the support platform via a fixed hinge support. Reinforcing bars are uniformly welded to the inner wall of the concrete silo. The vibrator is inserted into the freshly mixed concrete to be tested from the upper port of the concrete silo. The silo baffle and the laser sensor timer are both connected to the lower end of the concrete silo. The laser beam port of the laser sensor timer is aligned with the discharge port at the lower end of the concrete silo. The weighing machine is placed on the bottom layer of the support platform, and the concrete bucket is placed on the weighing machine, located below the discharge port at the lower end of the concrete silo. After the test begins, the freshly mixed concrete to be tested slides into the concrete bucket, and the weighing machine can display its weight change in real time.

[0014] The concrete silo is an open-type silo with a capacity of 80L and internal dimensions of 400mm×400mm×500mm.

[0015] The support platform comprises five layers. The first layer is the base of the support platform. The free end of the second layer is equipped with a fixed hinge support, and the lower end of the concrete silo is connected to the fixed hinge support. The free and fixed ends of the remaining three layers are equipped with high-strength bolt holes. When the test angle is reduced, the high-angle support platform can be disassembled by removing the bolt holes at the fixed end to avoid affecting the experiment. The high-strength bolts are connected to the upper end of the concrete silo 1 through the high-strength bolt holes at the free end, which can adjust the angle between the concrete silo and the horizontal direction to 30°, 45°, and 60° respectively.

[0016] The laser sensor timer is fixed at the lower outlet of the concrete silo, and the accuracy of the laser sensor timer is ±0.1s.

[0017] The weighing machine has a weighing range of 0-100kg and an accuracy of ±0.5g.

[0018] The concrete bucket is located at the lower end of the concrete silo in the direction of the discharge port. The distance between the opening of the concrete bucket and the discharge port of the concrete silo is 100-150mm. The capacity of the concrete bucket is 80L and the internal dimensions are 400×400×500mm.

[0019] Each layer of reinforcing bars is uniformly welded to the inner wall of the concrete silo in a cross shape. The top layer of reinforcing bars is 150mm away from the port of the concrete silo. The spacing between each layer of reinforcing bars is 200mm, and the size of the reinforcing bar mesh is 200mm.

[0020] The vibrating rod is inserted into the freshly mixed concrete to be tested from the upper port of the concrete silo and gradually moves upward as the concrete is poured.

[0021] The outstanding advantages of this invention are:

[0022] 1. This method can test and quantitatively evaluate the flowability of all-graded hydraulic concrete after vibration grouting. It is simple and quick, and overcomes the shortcomings of traditional evaluation methods, such as inaccurate flowability testing of concrete after screening out high-grade aggregate and increased testing workload.

[0023] 2. By calculating the evaluation index of the flowability of hydraulic concrete, it is possible to monitor and provide timely feedback on the flowability of freshly mixed hydraulic concrete from transportation to vibration and pouring. This has important engineering application value for quantitatively evaluating the flowability of hydraulic concrete on the construction site. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the initial state of the test experiment for the flowability of hydraulic concrete in Example 1.

[0025] Figure 2 This is a schematic diagram showing the state at the end of the test of the flowability of hydraulic concrete in Example 1.

[0026] Figure 3 This is a schematic diagram showing the test and evaluation results of the flowability of hydraulic concrete in Example 1.

[0027] The following are marked in the diagram: 1. Concrete silo, 2. Freshly mixed concrete to be tested, 3. Silo baffle, 4. Laser sensor timer, 5. Fixed hinge support, 6. High-strength bolt, 7. Support platform, 8. Concrete bucket, 9. Weighing machine, 10. Reinforcing bar, 11. Vibrator. Detailed Implementation

[0028] The technical solution of the present invention will be further described in detail below with reference to the accompanying drawings and embodiments.

[0029] Example 1

[0030] This embodiment is an example of the rapid quantitative evaluation method for simulating the flowability of hydraulic concrete at the actual pouring moment, as described in this invention, and includes the following steps:

[0031] (1) Test device for adjusting the flow performance of hydraulic concrete: Find a level test platform by using a level, place the concrete test device on the level platform, turn on the electronic scale and tare and zero it, weigh the concrete bucket to observe the weighing accuracy of the weighing machine. After confirming that it meets the weighing requirements, fix the concrete silo on the support platform and close the silo baffle.

[0032] (2) Record the weight of the concrete bucket at each stage of the flow performance test: Place the concrete bucket on the weighing machine and set it to zero and tare. Pour the uniformly prepared fresh concrete to be tested into the concrete bucket and stir it evenly. The weighing scale is W1. Connect the upper end of the concrete silo to the high-strength bolt so that the test angle is 60° and close the concrete silo baffle. Then gradually pour the fresh concrete to be tested from the concrete bucket into the concrete silo evenly within 1 minute. At the same time, use a vibrator to vibrate the hydraulic concrete through the steel bar. After pouring and vibrating, scrape off the excess concrete on the surface of the silo with a scraper and vibrate it fully. Collect the scraped concrete and pour it back into the concrete bucket. The weighing scale is W2. Scrape the concrete on the top surface of the concrete silo and let it stand for 3 seconds. Open the lower baffle of the concrete silo. Start timing at the same time as the fresh concrete to be tested leaks out. When the time reaches 7 seconds, immediately close the lower baffle of the concrete silo to prevent the concrete from falling further. Record the value displayed on the weighing machine at this time, W3.

[0033] (3) Based on the weight of each concrete mixture measured in step (2), calculate the quantitative evaluation index of the flowability of hydraulic concrete: Combine the weight values ​​of each stage of concrete bucket obtained from each test experiment, calculate the quantitative evaluation index of the flowability of hydraulic concrete at a 60° test angle.

[0034] The specific calculation formula for the quantitative evaluation index of the flowability performance of hydraulic concrete is as follows:

[0035]

[0036] In the formula, W1 is the weight of the freshly mixed concrete to be tested; W2 is the weight of the concrete in the concrete bucket after the concrete silo is filled and leveled; W3 is the weight of the concrete in the bucket 7 seconds after the concrete is poured from the silo; η is the evaluation index of the flowability of hydraulic concrete at a test angle of 60°, and the value of η is 0 < η < 1, where the larger the value of η, the better the flowability of the concrete.

[0037] The above experimental steps were performed in 3 parallel experiments, and the results of each experiment are shown in the table below.

[0038] Table 1. Test weight (kg) of freshly mixed concrete at various test angles.

[0039]

[0040]

[0041] Note: Due to losses in the hydraulic concrete mixture during the vibration test, W3 ≠ W1.

[0042] Table 2 Quantitative Evaluation Indicators of Flowability Performance of Hydraulic Concrete

[0043] test Evaluation index η <![CDATA[η1]]> 0.976795 <![CDATA[η2]]> 0.980547 <![CDATA[η3]]> 0.971189

[0044] Experimental results show that, according to the described flow performance testing method, only the flow performance evaluation test of hydraulic concrete at a test angle of 60° was carried out. The evaluation indices of the flow performance of hydraulic concrete at this test angle were 0.976795, 0.980547 and 0.971189, respectively. The evaluation results of the three tests were basically consistent, which also shows that this method can accurately and quickly quantitatively evaluate the flow performance of hydraulic concrete at the actual moment of placement in the mold after vibration and mixing.

[0045] Example 2

[0046] Comparison Figure 1 and Figure 2 This embodiment describes the testing device used in the rapid quantitative evaluation method for simulating the flow performance of hydraulic concrete at the actual pouring moment, as described in this invention. Specific components include a concrete silo 1, a silo baffle 3, a laser induction timer 4, a fixed hinge support 5, high-strength bolts 6, a support platform 7, a concrete bucket 8, a weighing machine 9, reinforcing bars 10, and a vibrator 11. The structure and connection method of these components are as follows:

[0047] The support platform 7 is placed on a horizontal ground. The upper end of the concrete silo 1 is connected to the support platform 7 by high-strength bolts 9, and the lower end of the concrete silo 1 is connected to the support platform 7 by a fixed hinge support 5. The reinforcing bars 10 are uniformly welded to the inner wall of the concrete silo 1. The vibrator 11 is inserted into the fresh concrete 2 to be tested from the upper port of the concrete silo 1. The silo baffle 3 and the laser sensor timer 4 are both connected to the lower end of the concrete silo 1. The laser beam port of the laser sensor timer 4 is aligned with the discharge port at the lower end of the concrete silo 1. The weighing machine 9 is placed on the bottom layer of the support platform, and the concrete bucket 8 is placed on the weighing machine 9 and located below the discharge port at the lower end of the concrete silo 1.

[0048] The concrete silo 1 is an open-type silo with a capacity of 80L and internal dimensions of 400mm×400mm×500mm.

[0049] The support platform 7 comprises five layers. The first layer is the base of the support platform 7. The free end of the second layer is equipped with a fixed hinge support 5, and the lower end of the concrete silo 1 is connected to the fixed hinge support 5. The free and fixed ends of the remaining three layers are equipped with high-strength bolt holes. When the test angle is reduced, the high-angle support platform can be disassembled by removing the bolt holes at the fixed end to avoid affecting the experiment. The high-strength bolts 6 are connected to the upper end of the concrete silo 1 through the high-strength bolt holes at the free end, which can adjust the angle between the concrete silo and the horizontal direction to 30°, 45°, and 60° respectively.

[0050] The laser sensing timer 4 is fixed at the lower outlet of the concrete silo 1, and the accuracy of the laser sensing timer 4 is ±0.1s.

[0051] The weighing machine 9 has a weighing range of 0-100kg and an accuracy of ±0.5g.

[0052] The concrete bucket 8 is located at the lower end of the concrete silo 1 in the direction of the discharge port. The distance between the opening of the concrete bucket 8 and the discharge port of the concrete silo 1 is 100-150mm. The concrete bucket 8 has a capacity of 80L and an internal space dimension of 400×400×500mm.

[0053] Each layer of the reinforcing bars 10 is cross-shaped and uniformly welded to the inner wall of the concrete silo 1. The uppermost layer of reinforcing bars is 150mm away from the port of the concrete silo, the spacing between each layer of reinforcing bars is 200mm, and the size of the reinforcing bar mesh is 200mm.

[0054] The vibrating rod 11 is inserted into the freshly mixed concrete 2 to be tested from the upper port of the concrete silo 1, and gradually moves upward as the concrete is poured.

[0055] Working principle and process:

[0056] The working principle of this invention is to rapidly and quantitatively evaluate the flowability of hydraulic concrete by simulating its state during actual construction and placement in the formwork. Specifically, the hydraulic concrete to be tested is placed in a testing device at different inclination angles (30°, 45°, 60°), and its flowability is observed under vibration. The evaluation index is calculated based on the weight difference of the concrete flowing out of the silo within a specific time. This method can easily and quickly evaluate the flowability of hydraulic concrete, thereby controlling and ensuring that the hydraulic concrete has good uniformity and compactness during construction, thus improving the quality of building projects.

[0057] The work process is as follows:

[0058] (1) Adjusting the flow performance testing device

[0059] Place the hydraulic concrete flowability testing device on the platform. After installation, adjust the testing angle for the hydraulic concrete flowability. Then, connect the upper end of the concrete hopper to the support platform using high-strength bolts. Connect the lower end of the concrete hopper to the support platform using a fixed hinge support. Connect the lower end of the concrete hopper to the hopper baffle and the laser sensor timer. Turn on the weighing machine and calibrate it to zero. Weigh the empty concrete hopper. After ensuring the weight meets the requirements, rotate the hopper baffle to close the lower port of the concrete hopper, ready for the test.

[0060] (2) Record the weight of the concrete bucket at each test stage.

[0061] The fresh concrete to be tested is poured into a hopper, and the weight of the concrete sample W1 is measured. The concrete is then poured into a silo within 1 minute, and a vibrator is used to vibrate the concrete in the silo through the reinforcing steel until the fresh concrete to be tested reaches a homogeneous state. After pouring, the concrete on the top surface of the silo is leveled with a scraper, and the scraped concrete is poured back into the hopper, and its weight W2 is measured. After standing for 3 seconds, the laser sensor timer at the lower edge of the concrete silo is activated, and then the silo baffle is rotated to allow the fresh concrete to flow out. At this time, the laser sensor timer senses the fresh concrete to be tested and starts timing for 7 seconds. Immediately after 7 seconds, the baffle is closed, and the weight W3 of the concrete displayed on the weighing machine is recorded.

[0062] (3) Calculate the quantitative evaluation indicators of flow performance

[0063] Based on the weights W1, W2 and W3 obtained in step (2), calculate the flow performance evaluation index of hydraulic concrete at the selected test angle.

[0064] The flowability properties of hydraulic concrete are calculated using the following formula:

[0065]

[0066] In the formula, W1 is the weight of the freshly mixed concrete to be tested; W2 is the weight of the concrete in the concrete bucket after the concrete silo is filled and leveled; W3 is the weight of the concrete in the bucket 7 seconds after the concrete is poured from the silo; η is the evaluation index of the flowability of hydraulic concrete at the selected test angle, and the value of η is 0 < η < 1, where the larger the value of η, the better the flowability of the concrete.

Claims

1. A rapid quantitative evaluation method for the flowability of simulated hydraulic concrete at the actual moment of pouring into the formwork, characterized in that, Includes the following steps: (1) Test device for adjusting the flow performance of hydraulic concrete: Find a level test platform by using a level, place the concrete test device on the level platform, turn on the electronic scale and tare and zero it, weigh the concrete bucket to observe the weighing accuracy of the weighing machine. After confirming that it meets the weighing requirements, fix the concrete silo on the support platform and close the silo baffle. (2) Record the weight of the concrete bucket at each stage of the flow performance test: Place the concrete bucket on the weighing machine and set it to zero and tare. Pour the uniformly prepared fresh concrete to be tested into the concrete bucket and stir it evenly. The weighing scale is W1. Connect the upper end of the concrete silo to the high-strength bolt to adjust the test angle and close the concrete silo baffle. Then, gradually pour the fresh concrete to be tested from the concrete bucket into the concrete silo evenly within 1 minute. Use a vibrator to vibrate the hydraulic concrete through the steel bar. After pouring and vibrating, scrape off the excess concrete on the surface of the silo with a scraper and vibrate it fully. Collect the scraped concrete and pour it back into the concrete bucket. The weighing scale is W2. Scrape the concrete on the top surface of the concrete silo and let it stand for 3 seconds. Open the lower baffle of the concrete silo. Start timing at the same time as the fresh concrete to be tested leaks out. When the time reaches 7 seconds, immediately close the lower baffle of the concrete silo to prevent the concrete from falling further. Record the value displayed on the weighing machine at this time, W3. (3) Based on the weight of each concrete mixture measured in step (2), calculate the quantitative evaluation index of the flowability of hydraulic concrete: Combine the weight values ​​of the concrete buckets at each stage obtained from each test experiment, calculate the quantitative evaluation index of the flowability of hydraulic concrete under the test angle. The specific calculation formula for the quantitative evaluation index of the flowability performance of hydraulic concrete is as follows: In the formula, W1 is the weight of the freshly mixed concrete to be tested; W2 is the weight of the concrete in the concrete bucket after the concrete silo is filled and leveled. W3: The weight of concrete in the bucket 7 seconds after the concrete silo is discharged; η: is an evaluation index of the flowability of hydraulic concrete under test angle, and the value of η is in the range of 0 < η < 1. The larger the value of η, the better the flowability of the concrete.

2. A testing apparatus applicable to the rapid quantitative evaluation method for simulating the flowability of hydraulic concrete at the actual pouring moment as described in claim 1, characterized in that, The apparatus includes a concrete silo, freshly mixed concrete to be tested, a silo baffle, a laser sensor timer, a fixed hinge support, high-strength bolts, a support platform, a concrete bucket, a weighing machine, reinforcing bars, and a vibrator. The support platform is placed on a horizontal surface. The upper end of the concrete silo is connected to the support platform via high-strength bolts, and the lower end of the concrete silo is connected to the support platform via a fixed hinge support. Reinforcing bars are uniformly welded to the inner wall of the concrete silo. The vibrator is inserted into the freshly mixed concrete to be tested from the upper port of the concrete silo. The silo baffle and the laser sensor timer are both connected to the lower end of the concrete silo. The laser beam port of the laser sensor timer is aligned with the discharge port at the lower end of the concrete silo. The weighing machine is placed on the bottom layer of the support platform, and the concrete bucket is placed on the weighing machine, located below the discharge port at the lower end of the concrete silo.

3. The testing apparatus for the rapid quantitative evaluation method of the flowability of simulated hydraulic concrete at the actual pouring moment, as described in claim 2, is characterized in that... The concrete silo is an open-type silo with a capacity of 80L and internal dimensions of 400mm×400mm×500mm.

4. The testing apparatus for the rapid quantitative evaluation method of the flowability of simulated hydraulic concrete at the actual pouring moment, as described in claim 2, is characterized in that... The support platform comprises five layers. The first layer is the base of the support platform. The free end of the second layer is equipped with a fixed hinge support, and the lower end of the concrete silo is connected to the fixed hinge support. The free and fixed ends of the remaining three layers are equipped with high-strength bolt holes. When the test angle is reduced, the high-angle support platform can be disassembled by removing the bolt holes at the fixed end to avoid affecting the experiment. The high-strength bolts 6 are connected to the upper end of the concrete silo 1 through the high-strength bolt holes at the free end, which can adjust the angle between the concrete silo and the horizontal direction to 30°, 45°, and 60° respectively.

5. The apparatus for rapidly and quantitatively evaluating the flowability of simulated hydraulic concrete at the actual pouring moment, as described in claim 2, is characterized in that... The laser sensor timer is fixed at the lower outlet of the concrete silo, and the accuracy of the laser sensor timer is ±0.1s.

6. The testing apparatus for the rapid quantitative evaluation method of the flowability of simulated hydraulic concrete at the actual pouring moment, as described in claim 2, is characterized in that... The weighing machine has a weighing range of 0-100kg and an accuracy of ±0.5g.

7. The testing apparatus for the rapid quantitative evaluation method of the flowability of simulated hydraulic concrete at the actual pouring moment, as described in claim 2, is characterized in that... The concrete bucket is located at the lower end of the concrete silo in the direction of the discharge port. The distance between the opening of the concrete bucket and the discharge port of the concrete silo is 100-150mm. The capacity of the concrete bucket is 80L and the internal dimensions are 400×400×500mm.

8. The testing apparatus for the rapid quantitative evaluation method of the flowability of simulated hydraulic concrete at the actual pouring moment, as described in claim 2, is characterized in that... Each layer of reinforcing bars is arranged in a cross shape and is evenly welded to the inner wall of the concrete silo. The top layer of reinforcing bars is 150mm away from the port of the concrete silo, the spacing between each layer of reinforcing bars is 200mm, and the size of the reinforcing bar mesh is 200mm.

9. The testing apparatus for the rapid quantitative evaluation method of the flowability of simulated hydraulic concrete at the actual pouring moment, as described in claim 2, is characterized in that... The vibrating rod is inserted into the freshly mixed concrete to be tested from the upper port of the concrete silo and gradually moves upward as the concrete is poured.

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