A centrifugal concrete slump test method

Abstract

The present invention discloses a method for testing the slump of centrifugal concrete. Add the concrete sample to be tested into the inner slump cylinder of the centrifugal suspended slump cylinder, and record the height h1 of the concrete sample; the concrete sample to be tested in the inner slump cylinder of the concrete slump starts to slump under the action of centrifugal force, and record the height h2 of the concrete sample; when the centrifugal force exceeds the pre-tightening force of the spring clip of the locking link mechanism, the link mechanism is released and drives the slide rail connecting the periphery of the inner slump cylinder of the concrete to disengage from the outer slump cylinder of the concrete, and the concrete sample is thrown from the inner slump cylinder of the concrete into the bottom slump cylinder of the concrete and the outer slump cylinder of the concrete, and record the height h3 of the concrete sample; synchronously compare h1, h2, and h3 of each group of concrete samples, and then realize the qualitative analysis of the slump of different concrete samples. Measure and compare the slump heights at different concrete slump stages; and then realize the qualitative analysis of the slump of different concrete samples.

Description

Technical Field

[0001] The present invention relates to a method for testing the slump of concrete, belonging to the technical field of concrete testing experiments, and particularly to a centrifugal method for testing the slump of concrete. Background Art

[0002] The slump of concrete mainly refers to the plasticizing performance and pumpability of concrete. The factors affecting the slump of concrete mainly include gradation change, water content, weighing deviation of weighing equipment, dosage of admixture, and also the temperature of cement which is easily overlooked. The slump refers to the workability of concrete, specifically ensuring the normal progress of construction, including the water retention, fluidity and cohesion of concrete.

[0003] With the development of new material technologies, the application of adding new materials to concrete to obtain modified concrete properties has become more and more common; for example, in order to address the problems of aging damage that may occur in concrete buildings and structures, such as concrete structure cracking, poor seismic performance, insufficient bearing capacity, etc., which affect their safety and service functions, in actual operation, adhesives are often added to concrete to enhance the viscosity between concretes, which can effectively prevent concrete cracking. The slump test in concrete modification experiments is very important for analyzing the modified properties of concrete. However, for special concretes, such as concrete specimens with good bonding performance, general ductility and elastic deformation, the test effect is often not good when conducting conventional concrete slump tests.

[0004] Chinese Patent No. 202122203246.7 discloses a slump test device for polymer-modified recycled concrete with high flexural strength, mainly improving the problem that when detecting the slump of concrete in the prior art, it is usually that the slump cone is manually pulled out, which is likely to scrape the concrete pile due to the inclined pulling direction, thus aggravating the slump of the concrete pile and affecting the measurement result. It includes a device housing and a movable door movably installed on one side of the device housing. A slump plate is fixedly installed inside the device housing, a slump cone is arranged above the slump plate, and a lifting mechanism is installed inside the device housing. This technology mainly solves the problem that when the slump cone is manually pulled out, it is easy to scrape the concrete pile due to the inclined pulling direction, and improves the measurement quality by setting the lifting mechanism to lift the slump cone instead of manual operation during the slump test of concrete.

[0005] Chinese Patent 201210596042.7 provides a method for controlling the slump of concrete discharged from a mixer by monitoring the current intensity of the mixer. For concrete with a certain mix ratio and the same feeding amount, the smaller the slump value of the concrete, the drier and thicker the concrete, the poorer its workability, the greater the resistance to the mixing shaft of the mixer, and the greater the power consumed by the mixing shaft; on the contrary, the larger the slump value of the concrete, the better the workability, the smaller the resistance to the mixing shaft, and the power calculation formula of the mixer is P = U·I, the working current I = P / V, and the voltage is constant and regarded as a constant. The power of the mixing shaft changes with the change of the current and is proportional to the current, that is, the slump value SL of the ready-mixed concrete is inversely proportional to the current I when the mixing shaft mixes the concrete; by monitoring the current intensity of the mixer motor to control the slump of the concrete, and finally control the quality of the concrete. This method is simple and fast, and can effectively reduce the work intensity of operators, reduce personnel allocation, improve the qualified rate of concrete, and increase the production efficiency of concrete, etc.

[0006] In summary, it can be significantly seen that there are not many current technical tests (slump) on viscous concrete, mainly due to the characteristics of viscous concrete itself: 1. The bonding performance characteristics of viscous concrete cause the traditional slump test to not be carried out normally; 2. Viscous concrete requires additional driving force for effective separation to meet the requirements of the slump test; 3. The bonding relationship between viscous concrete and the cylinder wall also needs to be considered.

[0007] Referring to the current concrete slump test and the technical specification requirements for concrete with added modified polymers, the present invention intends to design a new measurement method for viscous concrete. Through this method, the quality inspection of concrete specimens with different mix ratios can be qualitatively compared, and at the same time, the automation detection level of the slump test of multiple groups of concrete can be improved; this method can realize the slump test of concrete under hypergravity by means of the action of centrifugal force, and can significantly overcome the influence of the self-viscosity of traditional viscous concrete. Summary of the Invention

[0008] The purpose of the present invention is to design a centrifugal concrete slump test method, which adopts a suspended centrifugal structure. By adding a horizontal centrifugal structure, the concrete slump under hypergravity can be realized, the self-viscosity of viscous concrete can be overcome, and the horizontal level of the poured viscous concrete breaking away from the wall surface of the concrete container can be significantly increased; the separated viscous concrete undergoes centrifugal hypergravity slump, and then the slump test is completed; subsequently, the information of the slump of the viscous concrete can be collected through a high-definition camera or a ranging sensor; the whole device is an automated test, and the test quality and test efficiency can be fully guaranteed.

[0009] The technical solution adopted by the present invention is a centrifugal concrete slump test method, which includes the following steps:

[0010] Step 1: Add the concrete sample to be tested into the concrete slump inner cylinder of the centrifugal suspension slump cone. At this time, the height h1 of the concrete sample is recorded by the recording device. Start the motor, and the motor drives the fork arm and the concrete slump inner cylinder to rotate. The pre-suspended centrifugal suspension slump cone is adjusted from a vertical inclination with the opening upwards to a horizontal inclination with the opening biased.

[0011] Step 2: The rotation of the fork arm drives the bracket, the concrete slump outer cylinder, and the concrete slump inner cylinder to start centrifugal horizontal rotation. The concrete sample to be tested in the concrete slump inner cylinder starts to slump under the action of centrifugal force. At this time, the height h2 of the concrete sample is recorded by the recording device.

[0012] Step 3: Increase the speed of the motor. The fork arm drives the bracket, the concrete slump outer cylinder, and the concrete slump inner cylinder to start further centrifugal horizontal rotation. The centrifugal force acting on the centrifugal suspension slump cone increases. When the centrifugal force exceeds the pre-tightening force of the spring clip of the locking link mechanism, the link mechanism loosens and drives the slide rail connecting the periphery of the concrete slump inner cylinder to disengage from the concrete slump outer cylinder. The concrete sample is thrown from the concrete slump inner cylinder into the concrete slump bottom cylinder and the concrete slump outer cylinder. At this time, the height h3 of the concrete sample is recorded by the recording device.

[0013] Step 4: Synchronously compare h1, h2, and h3 of each group of concrete samples, and measure and compare the slump heights at different concrete slump stages. Furthermore, qualitative analysis of the slump of different concrete samples is realized.

[0014] A centrifugal concrete slump testing device includes a centrifugal suspension slump cone, which includes a fork arm, a bracket, a concrete slump outer cylinder, a concrete slump inner cylinder, a link mechanism, and a concrete slump bottom cylinder. The fork arm and the bracket are connected by a first pin shaft. The bracket is installed and fixed on the outer wall of the concrete slump outer cylinder through a second pin shaft. The bottom of the concrete slump outer cylinder is provided with a concrete slump bottom cylinder, and an integrated structure is formed between the concrete slump outer cylinder and the concrete slump bottom cylinder. A chute is provided on the inner wall of the concrete slump outer cylinder, and a slide rail is provided on the outer wall of the concrete slump inner cylinder. A sliding fit is formed between the concrete slump outer cylinder and the concrete slump inner cylinder. The top of the slide rail is connected to the concrete slump bottom cylinder through a link mechanism. A link mechanism is provided between the concrete slump outer cylinder and the bracket. The bracket and the link mechanism are installed on the concrete slump outer cylinder through a second pin shaft. The installation position of the second pin shaft is at a non-centroid position on the concrete slump outer cylinder. The concrete slump outer cylinder is suspended and installed through the link mechanism, the fork arm, and the bracket.

[0015] Further, due to the forces between the concrete slump inner cylinder and the link mechanism, and between the bracket and the concrete slump inner cylinder, when there is no viscous concrete filled in the concrete slump inner cylinder, the centrifugal suspension slump cylinder has an included angle of no more than 30° with the vertical direction; when the viscous concrete is filled in the concrete slump inner cylinder and the centrifugal suspension slump cylinder does not rotate centrifugally, the centrifugal suspension slump cylinder has an included angle of no more than 15° with the vertical direction; when the viscous concrete is filled in the concrete slump inner cylinder and the centrifugal suspension slump cylinder rotates centrifugally, the centrifugal suspension slump cylinder has an included angle of no more than 15° with the horizontal direction.

[0016] Further, the link mechanism includes a first rocker, a connecting rod and a second rocker; one end of the first rocker is connected to the slide rail on the outer wall of the concrete slump inner cylinder, the other end of the first rocker is hinged to one end of the second rocker through the connecting rod, and the other end of the second rocker is installed on the concrete slump bottom cylinder through a pin shaft. The connecting rod is the main rocker, and the first rocker and the second rocker are auxiliary rockers; the force of the first rocker stretching the concrete slump inner cylinder is determined by the rotation speed of the fork arm. The bracket is provided with a spring catch, and the spring catch is pre-fastened to the second rocker.

[0017] Further, the bracket and the connecting rod are installed on the outer wall of the concrete slump outer cylinder through a second pin shaft.

[0018] Further, when the torsional spring force of the spring catch is greater than or equal to the tensile force of the second rocker, the link mechanism is clamped by the spring catch at this time, and the concrete slump inner cylinder and the concrete slump outer cylinder are fixed; when the torsional spring force of the spring catch is less than the tensile force of the second rocker, the link mechanism is stretched at this time, and the link mechanism drives the slide rail to slide the concrete slump inner cylinder and the concrete slump outer cylinder apart. The tensile force of the second rocker is equal to the centrifugal force of the concrete slump inner cylinder, and the centrifugal force of the concrete slump inner cylinder is determined by the rotation speed of the fork arm.

[0019] Further, a leather wheel is provided at the top of the fork arm, and the leather wheel and the fork arm are coaxially connected; the leather wheel is driven by a motor, and the motor is installed on the outer wall of the outer cylinder; the leather wheel is installed at the top of the outer cylinder, and the centrifugal suspension slump cylinder is installed inside the outer cylinder.

[0020] Further, a ranging device is provided at the top of the concrete slump inner cylinder, and the ranging device is a ranging sensor or a high-definition camera. The elevation data of the viscous concrete in the concrete slump inner cylinder before and after slump is recorded by the ranging sensor; the images of the viscous concrete in the concrete slump inner cylinder before and after slump are recorded by the high-definition camera, and the slump quality of the viscous concrete is analyzed through the elevation data or the images.

[0021] Further, the number of the chutes is greater than or equal to one, preferably two.

[0022] Furthermore, the bottom area of the outer cylinder of the concrete slump is smaller than that of the bottom cylinder of the concrete slump; the inner cylinder of the concrete slump is a frustum of a cone structure; the cross-sections of the outer cylinder of the concrete slump and the bottom cylinder of the concrete slump are circular structures. The bottom area of the inner cylinder of the concrete slump is equal to the cross-sectional area of the outer cylinder of the concrete slump. The circumferential direction of the bottom cylinder of the concrete slump is provided with overflow holes.

[0023] Further, the spring clip includes a snap ring and a pin. One end of the snap ring is installed on the pin and the bracket, and the snap ring applies a pre-tightening force to the pin.

[0024] Compared with the prior art, the present invention has the following technical effects.

[0025] The present invention designs a horizontal centrifugal supergravity test structure. The inner cylinder of the concrete slump and the outer cylinder of the concrete slump are in a sliding fit. The inner cylinder of the concrete slump is pre-filled with viscous concrete to be detected. The motor drives the fork arm to rotate, and the fork arm drives the outer cylinder of the concrete slump to rotate. Due to the action of centrifugal force, the viscous concrete flows from the inner cylinder of the concrete slump into the bottom cylinder of the concrete slump and the outer cylinder of the concrete slump, overcoming the problem that traditional viscous concrete is difficult to flow and slump due to its own characteristics. At the same time, since the centrifugal force and the gravity are not in the same direction (the centrifugal force is in the horizontal direction and the gravity is in the vertical direction), the viscous concrete is separated by the horizontal centrifugal force to achieve slump, and the adhesion between the overall viscous concrete and the cylinder wall is overcome. Under the condition of the same volume of concrete and the same rotation speed, the slump and the slump process of the corresponding viscous concrete samples have qualitative analysis value. Compared with the traditional test technology, the present invention minimizes the viscosity of the viscous concrete, changes the original gravity drop into a centrifugal horizontal throw, utilizes the changes of the same volume of concrete in different cylinders, and analyzes and records the elevation data before and after slump with the help of image analysis or a ranging sensor, and then compares the slump levels of different groups of samples in the same direction.

[0026] The present invention adopts a horizontal centrifugal slump test scheme. During actual implementation, it can avoid the instability of the slump caused by the self-ductility deformation of the traditional slump test. In addition, the present invention can also well avoid the unstable factors brought by mechanical vibration.

[0027] The present invention is provided with a spring clip at the link mechanism to pre-fix the inner cylinder of the concrete slump through the spring clip. When the centrifugal force reaches a certain value, the elastic force of the spring clip is overcome, and the link mechanism pulls the inner cylinder of the concrete slump away from the outer cylinder of the concrete slump. The viscous concrete in the inner cylinder of the concrete slump is separated into the bottom cylinder of the concrete slump, and part of the viscous concrete is discharged from the overflow holes. By comparing the overflow amounts of different components of viscous concrete at the same rotation speed, the viscosity data of the viscous concrete are compared laterally. Description of the Drawings

[0028] Figure 1 Structural diagram of the centrifugal concrete slump test device of the present invention.

[0029] Figure 2 Elevation structural diagram of the centrifugal concrete slump test device of the present invention.

[0030] Figure 3 Structural diagram of the centrifugal suspension slump cone.

[0031] Figure 4 Internal schematic diagram of the centrifugal suspension slump cone in the centrifugal state.

[0032] Figure 5 Structural diagram of the link mechanism.

[0033] Figure 6 Schematic diagram of the centrifugal suspension slump cone in the centrifugal state.

[0034] Figure 7 Schematic diagram of the non-separated centrifugal suspension slump cone.

[0035] Figure 8 Schematic diagram of the separated centrifugal suspension slump cone.

[0036] In the figure: 1. Centrifugal suspension slump cone, 2. Outer cylinder, 3. Leather wheel, 4. Motor, 5. Fork arm, 6. Bracket, 7. Concrete slump outer cylinder, 8. Concrete slump inner cylinder, 9. Link mechanism, 10. Spring pin, 11. Concrete slump bottom cylinder, 12. Overflow hole.

[0037] 71. Slide groove.

[0038] 91. First rocker, 92. Connecting rod, 93. Second rocker. Detailed implementation manners

[0039] The present invention will be described in detail below with reference to the accompanying drawings and embodiments. The technical solutions 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. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. The description of an exemplary embodiment below is actually only illustrative and in no way limits the present invention and its application or use. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0040] Unless otherwise specifically stated, the relative arrangements, numerical expressions and values of the components and steps set forth in these embodiments do not limit the scope of the present invention.

[0041] At the same time, it should be understood that for the convenience of description, the dimensions of the various parts shown in the drawings are not drawn according to the actual proportional relationship.

[0042] Technologies, methods and devices known to those of ordinary skill in the relevant art may not be discussed in detail, but where appropriate, the said technologies, methods and devices should be regarded as part of the authorization specification.

[0043] In all the examples shown and discussed here, any specific value should be construed as merely exemplary and not as a limitation. Therefore, other examples of the exemplary embodiments may have different values.

[0044] The traditional slump test relies on gravity. By pulling out the slump cone, the internal test material is spread out, and the elevation data of the test is recorded through a scale. However, for viscous concrete, such as concrete with added adhesives, binders or other new composite materials, since the moisture in the viscous concrete is condensed inside and its viscosity coefficient is very high, the viscous concrete is not likely to slump under gravity due to its ductility. Therefore, the traditional slump test is not suitable for viscous concrete. The technical implementation principle of the present invention is as follows:

[0045] 1. Avoid the influence of gravity and use centrifugal force to throw out the concrete under the action of supergravity.

[0046] 2. If it rotates vertically in a centrifugal manner, the concrete has the possibility of being broken, which affects the slump test. Therefore, it is designed to be horizontally centrifugal, and considering the convenience of placing the concrete and the controllable characteristics of rotation, the rotating body is preferably designed as a suspended structure.

[0047] 3. Due to mechanical vibration, in order to minimize the influence of vibration as much as possible, the suspended structure is transformed into a suspended structure that is inclined to the horizontal. On the one hand, it overcomes the influence of gravity, and on the other hand, it realizes the slump of viscous concrete under the action of horizontal supergravity without being broken.

[0048] Such as Figure 1-5As shown in the figure, in a centrifugal concrete slump test device designed by the present invention, it includes a centrifugal suspension slump cone 1. The centrifugal suspension slump cone 1 includes a fork arm 5, a bracket 6, a concrete slump outer cylinder 7, a concrete slump inner cylinder 8, a linkage mechanism 9, and a concrete slump bottom cylinder 11. The fork arm 5 and the bracket 6 are connected by a first pin shaft. The bracket 6 is installed and fixed on the outer wall of the concrete slump outer cylinder 7 through a second pin shaft. The bottom of the concrete slump outer cylinder 7 is provided with a concrete slump bottom cylinder 11, and an integrated structure is formed between the concrete slump outer cylinder 7 and the concrete slump bottom cylinder 11. A chute 71 is provided on the inner wall of the concrete slump outer cylinder 7, a slide rail is provided on the outer wall of the concrete slump inner cylinder 8, and a sliding fit is formed between the concrete slump outer cylinder 7 and the concrete slump inner cylinder 8. The top of the slide rail is connected to the concrete slump bottom cylinder 11 through a linkage mechanism 9. A linkage mechanism 9 is provided between the concrete slump outer cylinder 7 and the bracket 6, and the bracket 6 and the linkage mechanism 9 are installed on the concrete slump outer cylinder 7 through a second pin shaft. The installation position of the second pin shaft is at a non-centroid position on the concrete slump outer cylinder 7, and the concrete slump outer cylinder 7 is suspended and installed through the linkage mechanism 9, the fork arm 5, and the bracket 6. A leather wheel 3 is provided at the top of the fork arm 5, and the leather wheel 3 and the fork arm 5 are coaxially connected. The leather wheel 3 is driven by a motor 4, and the motor 4 is installed on the outer wall of the outer cylinder 2. The leather wheel 3 is installed at the top of the outer cylinder 2, and the centrifugal suspension slump cone 1 is installed inside the outer cylinder 2. The motor 4 drives the fork arm 5 to rotate through the leather wheel 3. The fork arm 5 and the leather wheel 3 are connected by a key.

[0049] As Figure 1 , 3 shown, due to the acting force between the concrete slump inner cylinder 8 and the linkage mechanism 9, and the acting force between the bracket 6 and the concrete slump inner cylinder 8, when the concrete slump inner cylinder 8 is not filled with viscous concrete, the centrifugal suspension slump cone 1 has a deflection angle of no more than 30° with the vertical direction; when the concrete slump inner cylinder 8 is filled with viscous concrete and the centrifugal suspension slump cone 1 does not rotate centrifugally, the centrifugal suspension slump cone 1 has a deflection angle of no more than 15° with the vertical direction; when the concrete slump inner cylinder 8 is filled with viscous concrete and the centrifugal suspension slump cone 1 rotates centrifugally, the centrifugal suspension slump cone 1 has a deflection angle of no more than 15° with the horizontal direction.

[0050] As Figure 5 , 6As shown in the figure, the linkage mechanism 9 includes a first rocker 91, a connecting rod 92, and a second rocker 93. One end of the first rocker 91 is connected to the slide rail on the outer wall of the concrete slump inner cylinder 8. The other end of the first rocker 91 is hinged to one end of the second rocker 93 through the connecting rod 92. The other end of the second rocker 93 is installed on the concrete slump bottom cylinder 11 through a pin shaft. The connecting rod 92 is the main rocker, and the first rocker 91 and the second rocker 93 are auxiliary rockers. The force for the first rocker 91 to stretch the concrete slump inner cylinder 8 is determined by the rotation speed of the fork arm 5. A spring catch 10 is provided on the bracket 6, and the spring catch 10 is pre-clamped on the second rocker 93.

[0051] As Figure 7 , 8 shown in the figure, the bracket 6 and the connecting rod 92 are installed on the outer wall of the concrete slump outer cylinder 7 through a second pin shaft. When the torsional spring force of the spring catch 10 is greater than or equal to the tensile force of the second rocker 93, the linkage mechanism 9 is locked by the spring catch 10 at this time, and the concrete slump inner cylinder 8 and the concrete slump outer cylinder 7 are fixed. When the torsional spring force of the spring catch 10 is less than the tensile force of the second rocker 93, the linkage mechanism 9 is stretched at this time, and the linkage mechanism 9 drives the slide rail to slide the concrete slump inner cylinder 8 and the concrete slump outer cylinder 7 apart. The tensile force of the second rocker 93 is equal to the centrifugal force of the concrete slump inner cylinder 8, and the centrifugal force of the concrete slump inner cylinder 8 is determined by the rotation speed of the fork arm 5. The linkage mechanism 9 is composed of the main rocker

[0052] A ranging device is provided at the top of the concrete slump inner cylinder 8. The ranging device is a ranging sensor or a high-definition camera. The elevation data of the viscous concrete inside the concrete slump inner cylinder 8 before and after slumping is recorded through the ranging sensor. The images of the viscous concrete inside the concrete slump inner cylinder 8 before and after slumping are recorded through the high-definition camera, and the slump quality of the viscous concrete is analyzed through the elevation data or the images.

[0053] The number of the chute 71 is two. The bottom area of the concrete slump outer cylinder 7 is smaller than the bottom area of the concrete slump bottom cylinder 11. The concrete slump inner cylinder 8 is a frustum of a cone structure. The cross-sections of the concrete slump outer cylinder 7 and the concrete slump bottom cylinder 11 are circular structures. The bottom area of the concrete slump inner cylinder 8 is equal to the cross-sectional area of the concrete slump outer cylinder 7. An overflow hole 12 is provided circumferentially on the concrete slump bottom cylinder 11. The spring catch 10 includes a snap ring and a pin. One end of the snap ring is installed on the pin and the bracket 6, and the snap ring applies a pre-tightening force to the pin.

[0054] The present invention also designs a centrifugal concrete slump test method, and the test process of this method is as follows:

[0055] Step 1. Add the concrete sample to be tested into the concrete slump inner cylinder 8 of the centrifugal suspension slump cone 1. At this time, the height h1 of the concrete sample is recorded by the recording device; start the motor 4, and the motor 4 drives the fork arm 5 and the concrete slump inner cylinder 8 to rotate. The pre-suspended centrifugal suspension slump cone 1 is adjusted from a vertical inclination with the opening upward to an inclination with the opening horizontal.

[0056] Step 2. The rotation of the fork arm 5 drives the bracket 6, the concrete slump outer cylinder 7, and the concrete slump inner cylinder 8 to start centrifugal horizontal rotation; the concrete sample to be tested in the concrete slump inner cylinder 8 starts to slump under the action of centrifugal force (along the inner wall surface direction of the concrete slump inner cylinder 8); at this time, the height h2 of the concrete sample is recorded by the recording device.

[0057] Step 3. Increase the speed of the motor 4, and the fork arm 5 drives the bracket 6, the concrete slump outer cylinder 7, and the concrete slump inner cylinder 8 to start further centrifugal horizontal rotation; the centrifugal force received by the centrifugal suspension slump cone 1 increases. When the centrifugal force exceeds the spring pre-tightening force of the spring pin 10 of the locking link mechanism 9, the link mechanism 9 loosens and drives the slide rail connecting the periphery of the concrete slump inner cylinder 8 to disengage from the concrete slump outer cylinder 7, and the concrete sample is thrown from the concrete slump inner cylinder 8 into the concrete slump bottom cylinder 11 and the concrete slump outer cylinder 7. At this time, the height h3 of the concrete sample is recorded by the recording device.

[0058] Step 4. Synchronously compare h1, h2, and h3 of each group of concrete samples, and perform measurement and comparison on the slump heights at different concrete slump stages; thereby realizing the qualitative analysis of the slump of different concrete samples.

[0059] An overflow hole 12 is provided at the bottom of the concrete slump bottom cylinder 11, and the excess concrete in the concrete sample is thrown out from the overflow hole 12. By comparing the amount of the concrete sample thrown out from the overflow hole 12, the concrete viscosity level can be compared in the same direction.

[0060] Compared with the prior art, the recording device used in this test method is a ranging sensor or a high-definition camera, or both are used together; the elevation data of each group of concrete specimens is recorded by the ranging sensor, and the high-definition camera is used to record the change of elevation images, which can more intuitively and comprehensively compare the slump levels of cohesive concrete. The present invention overcomes the problem that traditional cohesive concrete is difficult to flow and slump due to its own characteristics by centrifugal force; since the centrifugal force and the gravity are not in the same direction, the cohesive concrete is separated by the horizontal centrifugal force to achieve slump, and the adhesion between the overall cohesive concrete and the barrel wall is overcome. Under the condition of the same volume of concrete and the same rotation speed, the slump and the slump process of the corresponding cohesive concrete specimens have qualitative analysis value; compared with the traditional test technology, the present invention minimizes the viscosity of the cohesive concrete, changes the original gravity drop into centrifugal horizontal throwing, uses the change of the same volume of concrete in different barrels, and analyzes and records the elevation data before and after slump by means of image analysis or ranging sensor analysis, and then compares the slump levels of different groups of concrete specimens in the same direction.

Claims

1. A centrifugal concrete slump test method, characterized in that: The device for implementing this test method includes a centrifugal suspension slump cone, which consists of a fork arm, a bracket, a concrete slump outer cylinder, a concrete slump inner cylinder, a linkage mechanism, and a concrete slump bottom cylinder. The fork arm and the bracket are connected by a first pin shaft, and the bracket is fixedly installed on the outer wall of the concrete slump outer cylinder through a second pin shaft. The bottom of the concrete slump outer cylinder is provided with a concrete slump bottom cylinder, and an integrated structure is formed between the concrete slump outer cylinder and the concrete slump bottom cylinder. A chute is provided on the inner wall of the concrete slump outer cylinder, and a slide rail is provided on the outer wall of the concrete slump inner cylinder. A sliding fit is formed between the concrete slump outer cylinder and the concrete slump inner cylinder. The top of the slide rail is connected to the concrete slump bottom cylinder through a linkage mechanism. A linkage mechanism is provided between the concrete slump outer cylinder and the bracket, and the bracket and the linkage mechanism are installed on the concrete slump outer cylinder through the second pin shaft. The installation position of the second pin shaft is at a non-centroid position on the concrete slump outer cylinder, and the concrete slump outer cylinder is suspended and installed through the linkage mechanism, the fork arm, and the bracket. This method includes the following steps: Step 1: Add the concrete sample to be tested into the concrete slump inner cylinder of the centrifugal suspension slump cone. At this time, the height h1 of the concrete sample is recorded by the recording device. Start the motor, and the motor drives the fork arm and the concrete slump inner cylinder to rotate. The pre-suspended centrifugal suspension slump cone is adjusted from a vertical inclination with the opening upward to an inclination with the opening horizontal. Step 2: The rotation of the fork arm drives the bracket, the concrete slump outer cylinder, and the concrete slump inner cylinder to start centrifugal horizontal rotation. The concrete sample to be tested in the concrete slump inner cylinder begins to slump under the action of centrifugal force. At this time, the height h2 of the concrete sample is recorded by the recording device. Step 3: Increase the motor speed, and the fork arm drives the bracket, the concrete slump outer cylinder, and the concrete slump inner cylinder to start further centrifugal horizontal rotation. The centrifugal force acting on the centrifugal suspension slump cone increases. When the centrifugal force exceeds the pre-tightening force of the spring clip of the spring clip that locks the linkage mechanism, the linkage mechanism loosens and drives the slide rail connecting the periphery of the concrete slump inner cylinder to disengage from the concrete slump outer cylinder. The concrete sample is thrown from the concrete slump inner cylinder into the concrete slump bottom cylinder and the concrete slump outer cylinder. At this time, the height h3 of the concrete sample is recorded by the recording device. Step 4: Synchronously compare h1, h2, and h3 of each group of concrete samples, and quantitatively compare the slump heights at different concrete slump stages. Furthermore, qualitative analysis of the slump of different concrete samples is realized.

2. The centrifugal concrete slump test method according to claim 1, characterized in that: Due to the force between the concrete slump inner cylinder and the linkage mechanism, and the force between the bracket and the concrete slump inner cylinder, when the concrete slump inner cylinder is not filled with viscous concrete, the centrifugal suspension slump cone has an included angle of no more than 30° with the vertical direction. When the concrete slump inner cylinder is filled with viscous concrete and the centrifugal suspension slump cone does not rotate centrifugally, the centrifugal suspension slump cone has an included angle of no more than 15° with the vertical direction. When the concrete slump inner cylinder is filled with viscous concrete and the centrifugal suspension slump cone rotates centrifugally, the centrifugal suspension slump cone has an included angle of no more than 15° with the horizontal direction.

3. A centrifugal concrete slump test method according to claim 1, characterized in that: The linkage mechanism includes a first rocker, a connecting rod, and a second rocker; one end of the first rocker is connected to the slide rail on the outer wall of the concrete slump inner cylinder, the other end of the first rocker is hinged to one end of the second rocker through the connecting rod, and the other end of the second rocker is installed on the concrete slump bottom cylinder through a pin shaft; the connecting rod is the main rocker, and the first rocker and the second rocker are auxiliary rockers; the force for the first rocker to stretch the concrete slump inner cylinder is determined by the rotation speed of the fork arm; a spring latch is provided on the bracket, and the spring latch is pre-latched on the second rocker.

4. The centrifugal concrete slump test method according to claim 3, characterized in that: When the torsional spring force of the spring latch is greater than or equal to the tensile force of the second rocker, the linkage mechanism is locked by the spring latch at this time, and the concrete slump inner cylinder and the concrete slump outer cylinder are fixed; when the torsional spring force of the spring latch is less than the tensile force of the second rocker, the linkage mechanism is stretched at this time, and the linkage mechanism drives the slide rail to slide the concrete slump inner cylinder and the concrete slump outer cylinder apart; the tensile force of the second rocker is equal to the centrifugal force of the concrete slump inner cylinder, and the centrifugal force of the concrete slump inner cylinder is determined by the rotation speed of the fork arm.

5. A centrifugal concrete slump test method according to claim 1, characterized in that: A leather wheel is provided at the top of the fork arm, and the leather wheel is coaxially connected to the fork arm; the leather wheel is driven by a motor, and the motor is installed on the outer wall of the outer cylinder. The leather wheel is installed at the top of the outer cylinder, and the centrifugal suspension slump cylinder is installed inside the outer cylinder.

6. The centrifugal concrete slump test method according to claim 1, characterized in that: A ranging device is provided at the top of the concrete slump inner cylinder. The ranging device is a ranging sensor or a high-definition camera. The elevation data of the viscous concrete in the concrete slump inner cylinder before and after slumping is recorded by the ranging sensor; the images of the viscous concrete in the concrete slump inner cylinder before and after slumping are recorded by the high-definition camera, and the slump quality of the viscous concrete is analyzed through the elevation data or the images.

7. A centrifugal concrete slump test method according to claim 1, characterized in that: The number of the chutes is four.

8. A centrifugal concrete slump test method according to claim 1, characterized in that: The bottom area of the concrete slump outer cylinder is smaller than the bottom area of the concrete slump bottom cylinder; the concrete slump inner cylinder is of a frustum of a cone structure; the cross sections of the concrete slump outer cylinder and the concrete slump bottom cylinder are of a circular structure; the bottom area of the concrete slump inner cylinder is equal to the cross-sectional area of the concrete slump outer cylinder.

9. A centrifugal concrete slump test method according to claim 3, characterized in that: The spring latch includes a snap ring and a pin. One end of the snap ring is installed on the pin and the bracket, and the snap ring applies a pre-tightening force to the pin.

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