Preparation method of high-strength self-compacting concrete

Abstract

The invention provides a preparation method of high-strength self-compacting concrete, and belongs to the technical field of concrete preparation. Comprising a machine body and a mounting plate, a machine frame is fixedly connected to the bottom of the machine body, a sample tube is fixedly connected to one side of the bottom of the machine body, a water conveying pipe is fixedly connected to the top of the sample tube, an electric control valve is fixedly connected to the sample tube, and a detection plate is fixedly connected to the bottom of the mounting plate; a slump cone is placed at the top of the detection plate; the detection assembly is used for detecting the slump degree and the expansion degree of concrete in the machine body, and the detection assembly is connected with the sample tube and the mounting plate. The slump and expansion degree of concrete can be automatically detected by arranging the detection assembly, human interference is not needed in the detection process, all operation of detection is fully automatically achieved, and by means of the arrangement, the sample detection accuracy is improved, and the detection efficiency is higher.

Description

Technical Field

[0001] The invention relates to the technical field of concrete preparation, and in particular to a method for preparing high-strength self-compacting concrete. Background Art

[0002] High-strength self-compacting concrete is a kind of concrete with high fluidity, high filling and good self-compacting properties. It can fill the formwork by itself and achieve the required density without relying on external vibration.

[0003] During the preparation process of high-strength self-compacting concrete, the slump and expansion of the samples need to be tested to ensure the qualified rate of the product. At present, the most common detection method is to use the slump cone for detection. The specific detection process is: first, the operator takes the sample from the sample device and fills it into the slump cone. During the filling process, the operator steps on the pedals on both sides of the slump cone with both feet to ensure that the slump cone is structurally stable during the filling process. After the sample is filled, the operator needs to lift the slump cone vertically and steadily. When the sample no longer collapses or the slump time reaches 30 seconds, the operator can measure and record the data.

[0004] In the above operation process: the operator often needs to use a funnel to prevent the concrete from leaking to the outer wall of the slump cone or the detection plate during the sample filling process. However, since the filling work is manually operated, it is difficult to control the pouring speed according to the viscosity of the concrete. In the actual operation process, the concrete often leaks due to improper operation, and the sample falls outside the slump cone and needs to be cleaned separately, affecting the detection efficiency; when the operator lifts the slump cone, the slump cone needs to be lifted vertically and smoothly, but due to the large volume of the slump cone and the lack of guide tools to assist the operator when lifting the slump cone, it is often impossible to ensure that the slump cone can be accurately lifted vertically during actual operation. If one side of the slump cone is lifted first, this will cause the concrete on the side of the slump cone that is lifted first to flow out first, thereby causing the position of the concrete collapse to be offset, making the detection data inaccurate. Therefore, based on the above problems, the present invention provides a method for preparing high-strength self-compacting concrete to meet the needs. Summary of the invention

[0005] The technical problem to be solved by the present invention is to provide a method for preparing high-strength self-compacting concrete. By setting up a detection component, the slump and expansion of concrete can be automatically detected. No human intervention is required in the detection process, and all detection operations are fully automatically realized. Such a setting not only improves the accuracy of sample detection but also makes the detection efficiency higher. The above setting can solve the problem of low efficiency of existing equipment when detecting the expansion and slump of concrete.

[0006] In order to solve the above technical problems, the present invention provides the following technical solutions:

[0007] A method for preparing high-strength self-compacting concrete comprises the following steps:

[0008] Step 1: Material preparation: Use metering equipment to accurately measure cementitious materials, aggregates, admixtures and water. The gel material mainly includes silicate cement or ordinary silicate cement. According to the product requirements of the project, it also includes fly ash, granulated blast furnace slag powder, silica fume and other mineral admixtures; the aggregate includes coarse aggregate and fine aggregate. The coarse aggregate is continuously graded, and the maximum nominal particle size should not be greater than 20mm. Medium sand is used as fine aggregate; the admixture mainly includes high-efficiency water reducing agent, as well as expansion agent, air entraining agent, defoaming agent, etc.

[0009] Step 2: Mix design: Design the mix ratio according to the project requirements. The self-compacting performance, strength, durability, etc. should be considered in the mix design. First, determine the concrete mix strength (fcu,o), fcu,o = fcu,k + 1.645σ, where fcu,k is the standard value of concrete cube compressive strength and σ is the standard deviation of concrete strength; then determine the water-cement ratio, which is determined according to the regression coefficient and the type of stone to ensure the durability of the concrete. The water-cement ratio is less than 0.45, and the amount of cementitious material should be controlled at 400kg / m 3 Up to 550kg / m 3 Then select the unit mixing water consumption of concrete, which is determined based on the hardness and plasticity of concrete; finally add appropriate amount of mineral admixtures, such as fly ash, granulated blast furnace slag powder, silica fume, etc. to adjust the rheological properties of concrete;

[0010] Step 3: Mixing: Use a mixer to mix fine aggregate and coarse aggregate evenly, then add sodium polyacrylate, dispersant, expansion agent, limestone powder particles, cement and mix evenly, finally add water reducer and mix evenly, then add water and mix evenly, the mixing time shall not be less than 60 seconds, and shall be appropriately longer than that of non-self-compacting concrete;

[0011] Step 4: Sampling and testing: Use a sampling bucket to take samples from the mixer. After ensuring that the inner wall of the slump cone and the bottom plate are moistened and free of visible water, place the slump cone on a solid and horizontal bottom plate testing surface. The slump cone is placed in the center of the bottom plate. The operator steps on the pedals on both sides of the slump cone to ensure that the slump cone remains in a fixed position during the loading process. Fill the materials in the sampling bucket into the slump cone. After the materials are filled, remove the loading funnel on the top of the slump cone, scrape off the excess concrete mixture and smooth it along the mouth of the cone. Then the operator lifts the slump cone vertically and steadily. After the materials in the slump cone are completely removed, place the slump cone gently next to the sample. When the sample on the bottom plate no longer collapses or the slump time reaches 30 seconds, the operator observes, measures and records the data.

[0012] Step 5. Transportation and pouring: Use concrete mixer trucks to transport materials that meet the project requirements to the project site, and take measures such as sun protection and cold protection during transportation. When pouring self-compacting concrete, a dedicated person will monitor on-site to ensure that the self-compactness of the concrete meets the requirements. After the self-compacting concrete is poured, timely adopt maintenance measures such as covering, water storage, film moisturizing, spraying or brushing curing agents, and the maintenance time shall not be less than 14 days.

[0013] Optionally, the mixer includes a body and a mounting plate, the bottom of the body is fixedly connected to a frame, one side of the bottom of the body is fixedly connected to a sample tube, the top of the sample tube is fixedly connected to a water pipe, the sample tube is fixedly connected to an electric control valve, the bottom of the mounting plate is fixedly connected to a detection plate, a slump cone is placed on the top of the detection plate; a detection component, the detection component is used to detect the slump and expansion of concrete in the body, the detection component is respectively connected to the sample tube and the mounting plate.

[0014] Optionally, the detection assembly includes an inner sleeve threaded on the bottom of the sample tube, and also includes a lifting mechanism fixedly connected to one side of the mounting plate, one side of the lifting mechanism is fixedly connected to a mounting frame, and one end of the mounting frame is fixedly connected to an outer sleeve.

[0015] Optionally, a triangular spring plate is fixedly connected to the bottom of the outer sleeve, and a V-shaped clamping plate that matches the contour of the triangular spring plate is fixedly connected to the top of the slump cone.

[0016] Optionally, a recessed portion is provided on the top of the triangular spring plate, a connecting plate is symmetrically installed on the top of the triangular spring plate, and a buckle plate is fixedly connected to the top of the connecting plate.

[0017] Optionally, a partition is fixedly connected to the inner circumference of the V-shaped clamping plate, a second avoidance groove adapted to the size of the partition is provided at the bottom of the outer sleeve, and a first avoidance groove is provided at the installation position of the triangular spring plate on the outer sleeve.

[0018] Optionally, the outer sleeve is a hollow frame structure, and the outer sleeve and the mounting frame are an integrally manufactured structure.

[0019] Optionally, an expansion plate is fixedly connected to the bottom of the inner sleeve, a weakening groove is provided at the connection position between the expansion plate and the inner sleeve, an elastic rod is installed on the inner wall of the expansion plate, and stretching plates are clamped at both ends of the elastic rod.

[0020] Optionally, the elastic rod is a curved elastic structure, a connecting rod is fixedly connected to the middle position of the elastic rod, and one side of the connecting rod is fixed to the inner wall of the expansion plate.

[0021] Optionally, both ends of the stretching plate are provided with snap-in grooves matched with the size of the elastic rod.

[0022] Compared with the prior art, the present invention has at least the following beneficial effects:

[0023] In the above scheme, the concrete preparation method provided in the present application has been precisely designed for the process of sampling and testing after concrete mixing, wherein the concrete mixed in the mixer is transported to the detection component through a sample tube, and the slump and expansion of the concrete can be automatically detected through the detection component. No human intervention is required in the detection process, and all detection operations are fully automatically realized. Such a setting not only improves the accuracy of sample detection but also makes the detection efficiency higher.

[0024] By arranging an outer sleeve in the detection component, when it is necessary to detect the concrete, first the slump cone is placed in the center of the detection board, and then the operator starts the lifting component. After the lifting component is started, it will first drive the outer sleeve to move downward for a distance, and during the downward movement of the outer sleeve, it will be clamped and fixed together with the slump cone. After the two are clamped and fixed, the slump cone can be auxiliary fixed with the help of the outer sleeve, and the stability of the slump cone can be improved under the limiting effect of the outer sleeve, thereby ensuring that the slump cone will not swing during the concrete filling process, and then the concrete will not leak sideways, thereby improving the detection accuracy of the detection component. When the concrete is filled, the lifting component drives the outer sleeve to drive the slump cone to move upward, and during the upward movement of the slump cone, the concrete inside it will collapse on the detection board. Since the centers of the outer sleeve, the slump cone and the detection board are on the same axis, the slump cone always remains vertical to the detection board during the lifting process, thereby making the data obtained by the test more accurate.

[0025] An inner sleeve is arranged in the detection component, an expansion plate is arranged at the end of the inner sleeve, the expansion plate is a segmented structure and an elastic rod is installed on the inner wall, and the two ends of the elastic rod are clamped and fixed with the stretching plate. Before the slump cone is lifted, the expansion plate is located at the top of the slump cone. During the lifting process of the slump cone, the inner sleeve will gradually extend into the interior of the slump cone. Since the slump cone is a conical structure, the stretching plate will push the expansion plate to deform and expand outward under the action of the elastic force of the elastic rod, and the expansion plate will always contact the inner wall of the slump cone during the upward movement of the slump cone. Since the stretching plate is installed in the gap of the segmented structure of the expansion plate, the stretching plate and the expansion plate can form a whole circular cross-sectional profile. This arrangement allows the stretching plate and the expansion plate to scrape off the concrete adhering to the inner wall of the slump cone, preventing concrete from remaining on the inner wall of the slump cone. The above arrangement eliminates the need to wait for the concrete to automatically slide down after the slump cone is lifted, ensuring that the concrete can fall off quickly after the slump cone is lifted. On the one hand, it improves the accuracy of the detection, and on the other hand, it shortens the detection time and improves the detection efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] The accompanying drawings, which are incorporated herein and constitute a part of the specification, illustrate embodiments of the invention and, together with the description, further serve to explain the principles of the invention and to enable those skilled in the relevant art to make and use the invention.

[0027] Figure 1 It is a three-dimensional structural schematic diagram of a method for preparing high-strength self-compacting concrete;

[0028] Figure 2 A schematic diagram of the enlarged three-dimensional structure is provided for the cooperation of the detection organization;

[0029] Figure 3 It is a schematic diagram of the enlarged three-dimensional structure of the mounting plate and the slump cone;

[0030] Figure 4 It is an enlarged three-dimensional structural diagram of the lifting mechanism and the outer sleeve;

[0031] Figure 5 It is a schematic diagram of the cross-sectional structure of the outer sleeve before it descends and the slump cone;

[0032] Figure 6 for Figure 5 A in the middle is an enlarged schematic diagram of the three-dimensional structure;

[0033] Figure 7 It is a schematic diagram of the cross-sectional structure of the outer sleeve after it is lowered and cooperates with the slump cone;

[0034] Figure 8 for Figure 7 The enlarged three-dimensional structure diagram at B in the middle;

[0035] Fig. 9 It is an enlarged three-dimensional structural diagram of the slump cone and the V-shaped clamping plate;

[0036] Fig.10 It is a schematic diagram of the enlarged three-dimensional structure of the outer sleeve;

[0037] Fig.11 for Fig.10 The enlarged three-dimensional structure diagram at C in the middle;

[0038] Fig.12 It is a schematic diagram of the cross-sectional structure of the sample tube, inner sleeve and slump cone;

[0039] Fig.13 for Fig.12 The enlarged three-dimensional structure diagram at D in the middle;

[0040] Fig.14 for Fig.12 The enlarged three-dimensional structure diagram at E in the middle;

[0041] Fig.15 It is a schematic diagram of the cross-sectional three-dimensional structure of the inner sleeve, the elastic rod and the stretching plate;

[0042] Fig.16 It is a schematic diagram of the enlarged three-dimensional structure of the elastic rod and the tensile plate;

[0043] Fig.17 for Fig.16 The enlarged schematic diagram of the three-dimensional structure is shown at F in the middle.

[0044] Reference numerals:

[0045] 1. Machine body; 101. Machine frame; 2. Sample tube; 201. Electric control valve; 202. Water pipe; 3. Mounting plate; 301. Detection plate; 4. Lifting mechanism; 401. Mounting frame; 5. Outer sleeve; 501. Triangular spring plate; 502. Recessed portion; 503. Connecting plate; 504. Buckle plate; 505. First avoidance groove; 506. Second avoidance groove; 6. Inner sleeve; 601. Expansion plate; 602. Weakened groove; 603. Elastic rod; 604. Connecting rod; 605. Tensile plate; 606. Snap-in groove; 7. Slump cone; 701. V-shaped snap-in plate; 702. Partition plate.

[0046] As shown in the figure, in order to clearly implement the structure of the embodiment of the present invention, specific structures and devices are marked in the figure, but this is only for illustrative purposes and is not intended to limit the present invention to the specific structure, device and environment. According to specific needs, ordinary technicians in this field can adjust or modify these devices and environments. DETAILED DESCRIPTION

[0047] The following is a detailed description of a method for preparing a high-strength self-compacting concrete provided by the present invention in conjunction with the accompanying drawings and specific embodiments. At the same time, it is explained here that in order to make the embodiments more detailed, the following embodiments are the best and preferred embodiments, and those skilled in the art may also adopt other alternative methods to implement some known technologies; and the accompanying drawings are only for more specific description of the embodiments, and are not intended to specifically limit the present invention.

[0048] It should be noted that the references to "one embodiment", "an embodiment", "an exemplary embodiment", "some embodiments" and the like in the specification indicate that the embodiments described may include specific features, structures or characteristics, but not every embodiment may include the specific features, structures or characteristics. In addition, when a specific feature, structure or characteristic is described in conjunction with an embodiment, it should be within the knowledge of a person skilled in the art to implement such feature, structure or characteristic in conjunction with other embodiments (whether or not explicitly described).

[0049] In general, a term can be understood, at least in part, from its use in context. For example, depending, at least in part, on the context, the term "one or more" as used herein can be used to describe any feature, structure, or characteristic in the singular sense, or can be used to describe a combination of features, structures, or characteristics in the plural sense. Additionally, the term "based on" can be understood as not necessarily intended to convey an exclusive set of factors, but can instead, depending, at least in part, on the context, allow for the presence of other factors that are not necessarily explicitly described.

[0050] It will be understood that the meanings of “on,” “over,” and “above” in the present invention should be interpreted in the broadest manner, so that “on” not only means “directly on” something, but also includes the meaning of being “on” something with intervening features or layers therebetween, and “on” or “over” not only means “on” or “above” something, but also includes the meaning of being “on” or “above” something with no intervening features or layers therebetween.

[0051] Additionally, spatially relative terms such as "under," "beneath," "lower," "above," "upper," and the like may be used herein for descriptive convenience to describe the relationship of one element or feature to another element or features, as shown in the accompanying drawings. Spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the accompanying drawings. The device may be oriented in other ways, and the spatially relative descriptors used herein may be similarly interpreted accordingly.

[0052] like Figures 1 to 4 As shown, an embodiment of the present invention provides a method for preparing high-strength self-compacting concrete, comprising the following steps:

[0053] Step 1: Material preparation: Use metering equipment to accurately measure cementitious materials, aggregates, admixtures and water. The gel material mainly includes silicate cement or ordinary silicate cement. According to the product requirements of the project, it also includes fly ash, granulated blast furnace slag powder, silica fume and other mineral admixtures; the aggregate includes coarse aggregate and fine aggregate. The coarse aggregate is continuously graded, and the maximum nominal particle size should not be greater than 20mm. Medium sand is used as fine aggregate; the admixture mainly includes high-efficiency water reducing agent, as well as expansion agent, air entraining agent, defoaming agent, etc.

[0054] Step 2: Mix design: Design the mix ratio according to the project requirements. The self-compacting performance, strength, durability, etc. should be considered in the mix design. First, determine the concrete mix strength (fcu,o), fcu,o = fcu,k + 1.645σ, where fcu,k is the standard value of concrete cube compressive strength and σ is the standard deviation of concrete strength; then determine the water-cement ratio, which is determined according to the regression coefficient and the type of stone to ensure the durability of the concrete. The water-cement ratio is less than 0.45, and the amount of cementitious material should be controlled at 400kg / m 3 Up to 550kg / m 3 Then select the unit mixing water consumption of concrete, which is determined based on the hardness and plasticity of concrete; finally add appropriate amount of mineral admixtures, such as fly ash, granulated blast furnace slag powder, silica fume, etc. to adjust the rheological properties of concrete;

[0055] Step 3: Mixing: Use a mixer to mix fine aggregate and coarse aggregate evenly, then add sodium polyacrylate, dispersant, expansion agent, limestone powder particles, cement and mix evenly, finally add water reducer and mix evenly, then add water and mix evenly, the mixing time shall not be less than 60 seconds, and shall be appropriately longer than that of non-self-compacting concrete;

[0056] Step 4, sampling and testing: Use the sampling bucket to take samples from the mixer, ensure that the inner wall of the slump cone 7 and the bottom plate are moistened without visible water, then place the slump cone 7 on a solid and horizontal bottom plate testing surface, and place the slump cone 7 in the center of the bottom plate. The operator steps on the pedals on both sides of the slump cone 7 to ensure that the slump cone 7 remains in a fixed position during the loading process, and fills the materials in the sampling bucket into the slump cone 7. After the materials are filled, remove the charging funnel on the top of the slump cone 7, scrape off the excess concrete mixture and smooth it along the mouth of the cone, then the operator lifts the slump cone 7 vertically and steadily, and after the materials in the slump cone 7 are completely removed, gently place the slump cone 7 next to the sample. When the sample on the bottom plate no longer collapses or the slump time reaches 30 seconds, the operator observes, measures and records the data;

[0057] Step 5, transportation and pouring: transport materials that meet the project requirements to the project site by concrete mixer trucks, and take sun protection and cold protection measures during transportation. When pouring self-compacting concrete, a dedicated person will monitor on site to ensure that the self-compactness of the concrete meets the requirements. After the self-compacting concrete is poured, timely adopt maintenance measures such as covering, water storage, film moisturizing, spraying or brushing curing agent, and the maintenance time is not less than 14 days. The mixer includes a body 1 and a mounting plate 3. The bottom of the body 1 is fixedly connected to a frame 101, one side of the bottom of the body 1 is fixedly connected to a sample tube 2, the top of the sample tube 2 is fixedly connected to a water pipe 202, the sample tube 2 is fixedly connected to an electric control valve 201, and the mounting plate 3 A detection plate 301 is fixedly connected to the bottom, and a slump cone 7 is placed on the top of the detection plate 301; a detection component is used to detect the slump and expansion of concrete in the body 1, and the detection component is connected to the sample tube 2 and the mounting plate 3 respectively. The concrete preparation method provided in the present application is precisely designed for the process of sampling and testing after concrete mixing, wherein the mixed concrete in the mixer is transported to the detection component through the sample tube 2, and the slump and expansion of the concrete can be automatically detected by the detection component. No human intervention is required in the detection process, and all detection operations are fully automatically realized. Such a setting not only improves the accuracy of sample detection but also makes the detection efficiency higher.

[0058] Specifically, in the actual operation process, the mixed concrete does not need to be taken out from the mixer body 1. The operator only needs to open the electric control valve 201 on the console. Here, the sample tube 2 is installed at the bottom of the body 1, so that after the electric control valve 201 is opened, the concrete in the body 1 will automatically flow out along the sample tube 2 under the action of gravity, and the concrete in the sample tube 2 will eventually flow into the detection component, and then the slump and expansion detection operation will be automatically realized through the detection component. In the above scheme, a flow sensor is installed in the sample tube 2 where the electric control valve 201 is installed. Since the size of the slump cone 7 is fixed Therefore, the volume of concrete loaded into the slump cone 7 each time is also fixed. Here, when the electric control valve 201 is opened, the flow rate of concrete flowing out of the sample tube 2 will be detected by the flow sensor. When the flow rate reaches the dosage required by the slump cone 7, the control console will automatically control the electric valve to close. There is no need for manual observation and control of the dosage of concrete loaded into the slump cone 7. Such a setting can not only prevent the phenomenon of excessive concrete outflow and waste, but also ensure that the volume of concrete loaded into the slump cone 7 each time is consistent, thereby improving the accuracy of the slump cone 7 in detecting the slump and expansion of concrete.

[0059] Furthermore, a water pipe 202 is installed at the end of the sample tube 2, and a one-way valve is installed at the connecting end of the water pipe 202 and the sample tube 2. The setting of the one-way valve prevents the concrete in the sample tube 2 from entering the water pipe 202. The other end of the water pipe 202 is connected to an external water source. When the device is used, the user can inject clean water into the sample tube 2 through the water pipe 202 to rinse and clean the residual concrete on the inner wall of the sample tube 2 for the next use. In addition, the clean water discharged from the sample tube 2 can also clean the detection component, thereby improving the use efficiency of the entire device.

[0060] The detection component provided in the present application is in accordance with the national concrete slump detection standard, and a slump cone 7 is used for detection. The specifications and dimensions of the slump cone 7 are manufactured in accordance with the standards in the industry standard of the People's Republic of China JTG 3420-2020 Test Procedure for Cement and Cement Concrete for Highway Engineering. Compared with the existing slump cone 7, the slump cone 7 provided in the present application does not have two foot pedals at the bottom and no handle for lifting at the top. This not only reduces the manufacturing cost of the slump cone 7 but also reduces the processing technology, making the slump cone 7 provided in the present application easier to mass produce and transport.

[0061] As an implementation method in this embodiment, Figures 1 to 11As shown, the detection assembly includes an inner sleeve 6 screwed to the bottom of the sample tube 2, and also includes a lifting mechanism 4 fixedly connected to one side of the mounting plate 3, one side of the lifting mechanism 4 is fixedly connected to a mounting frame 401, one end of the mounting frame 401 is fixedly connected to an outer sleeve 5, the bottom of the outer sleeve 5 is fixedly connected to a triangular spring plate 501, the top of the slump cone 7 is fixedly connected to a V-shaped clamping plate 701 that matches the contour of the triangular spring plate 501, the top of the triangular spring plate 501 is provided with a recessed portion 502, the top of the triangular spring plate 501 is symmetrically installed with a connecting plate 503, and the top of the connecting plate 503 is fixedly connected to a buckle plate 504, a partition 702 is fixedly connected to the inner circumference of the V-shaped clamping plate 701, a second avoidance groove 506 matching the size of the partition 702 is provided at the bottom of the outer sleeve 5, a first avoidance groove 505 is provided at the installation position of the triangular spring plate 501 on the outer sleeve 5, the outer sleeve 5 is a hollow frame structure, the outer sleeve 5 and the mounting frame 401 are an integrally manufactured structure, the detection assembly provided in the present application is mainly used for the detection of concrete slump and expansion, and only relies on the lifting mechanism 4 as a driving unit to drive all operations of the assembly in the detection assembly, such a setting can minimize the installation The investment cost of the device is reduced, and the detection component is simpler in the actual operation process, which improves the efficiency of the entire detection process. The lifting mechanism 4 here is a stepping drive mechanism, which is mainly composed of a stepping motor, a screw rod, a coupling, a bearing, a guide rail and other components. Its working principle is based on the control characteristics of the stepping motor. The stepping motor controls the angle and speed of the screw rod by receiving a pulse signal, and then converts it into linear motion through a mechanical structure to achieve a lifting action. The working principle of the lifting mechanism 4 is disclosed as a prior art, so it will not be described in detail. The lifting end of the lifting mechanism 4 is installed with a mounting frame 401. The outer sleeve 5 installed at one end of the frame 401 is concentric with the center of the detection plate 301. This arrangement ensures that when the user places the slump cone 7 at the center of the detection plate 301, the outer sleeve 5 will always maintain a relatively vertical state with the slump cone 7 during the lifting process. It is worth mentioning that the lifting mechanism 4 is installed and fixed through the mounting plate 3, and the detection plate 301 is provided with scales for detecting slump and expansion for detection and measurement, wherein the mounting plate 3 and the detection plate 301 are an integrally manufactured structure. This arrangement improves the compactness of the device structure and makes the device more efficient during production and assembly.

[0062] The detection component mainly includes an inner sleeve 6 and an outer sleeve 5. The top end of the inner sleeve 6 is screwed together with the end of the sample tube 2, and the bottom end of the inner sleeve 6 is just located at the top of the slump cone 7, and the bottom end of the inner sleeve 6 slightly extends into the slump cone 7 for a distance. This arrangement allows the concrete flowing out of the sample tube 2 to be supported along the inner sleeve 6 into the slump cone 7 without side leakage, thereby improving the accuracy of the detection.

[0063] When it is necessary to test the concrete, first place the slump cone 7 at the center of the test plate 301, and then the operator starts the lifting assembly. After the lifting assembly is started, it will first drive the outer sleeve 5 to move downward for a distance. As described above, the axis of the outer sleeve 5 is concentric with the center of the test plate 301, so the positions of the triangular spring plate 501 on the outer sleeve 5 and the V-shaped clamping plate 701 on the slump cone 7 correspond to each other. Therefore, during the downward movement of the outer sleeve 5, the triangular spring plate 501 will be clamped into the V-shaped clamping plate 701. Specifically, the triangular spring plate 501 is an elastic structure with a triangular structural profile. A recessed portion 502 is provided on the top of the triangular spring plate 501. The provision of the recessed portion 502 makes it easy for the triangular spring plate 501 to deform toward the position where the recessed portion 502 is recessed under the extrusion of an external force, thereby making the overall profile of the triangular spring plate 501 flat. The profile of the V-shaped clamping plate 701 on the slump cone 7 is a "V"-shaped structure, and the provision of this structure is just adapted to the triangular profile of the triangular spring plate 501 (e.g. Figure 5 and Figure 6 As shown in the figure, when the outer sleeve 5 moves downward, the triangular spring plate 501 will be squeezed and deformed by the V-shaped clamping plate 701, and its body will become flat during the deformation process. As the outer sleeve 5 continues to move downward, the flattened triangular spring plate 501 will pass through the gap at the bottom of the V-shaped clamping plate 701, until the triangular spring plate 501 completely passes through the V-shaped clamping plate 701, and then the triangular spring plate 501 will restore its deformation under the action of elasticity. At this time, the triangular spring plate 501 and the V-shaped clamping plate 701 will form a clamping adaptation in structure, so that the outer sleeve 5 and the slump cone 7 are clamped together (as shown in the figure). Figure 7 and Figure 8 As shown in the figure, in the above scheme, after the lifting mechanism 4 is started, it will first drive the outer sleeve 5 to move downward for a distance. During the movement of the outer sleeve 5, the outer sleeve 5 and the slump cone 7 are clamped together by the triangular spring plate 501 and the V-shaped clamping plate 701. Here, the triangular structure of the triangular spring plate 501 and the "V"-shaped structure of the V-shaped clamping plate 701 allow the two to be auxiliaryly guided by the inclined contour during the clamping process, making it easier for the two to align and insert. Even if the user does not place the slump cone 7 in the exact center of the detection plate 301, the triangular spring plate 501 and the V-shaped clamping plate 701 can also be auxiliaryly guided by the structural The outer sleeve 5 and the slump cone 7 are assisted to be clamped together under the guiding action. When the two are clamped and fixed, the outer sleeve 5, the slump cone 7 and the lifting mechanism 4 become a whole driving structure. At this time, the slump cone 7 can be assisted to be fixed with the help of the outer sleeve 5. After the operator opens the electric control valve 201, the concrete in the body 1 is loaded into the slump cone 7 along the sample tube 2 and the inner sleeve 6 in turn. Under the limiting action of the outer sleeve 5, the stability of the slump cone 7 can be improved, thereby ensuring that the slump cone 7 will not swing during the concrete filling process, and then the concrete will not leak sideways, thereby improving the accuracy of the detection of the detection component.

[0064] When the concrete is filled, the lifting assembly drives the outer sleeve 5 to move the slump cone 7 upward. During the upward movement of the slump cone 7, the concrete inside it will collapse on the detection plate 301. When the concrete in the slump cone 7 no longer collapses or the collapse time reaches 30 seconds, the operator can measure and record the data. Since the centers of the outer sleeve 5, the slump cone 7 and the detection plate 301 are on the same axis, the slump cone 7 always remains vertical to the detection plate 301 during the lifting process, thereby making the detected data more accurate.

[0065] When the detection component is used up, the user can pull up the buckle plate 504 on the top of the triangular spring plate 501 to disengage the triangular spring plate 501 from the limit. Specifically, after the buckle plate 504 is pulled up, the triangular spring plate 501 will be deformed. At this time, the recessed portion 502 on the top of the triangular spring plate 501 will become straight under the pulling action of the buckle plate 504. At the same time, the inclined structures on both sides of the triangular spring plate 501 will also become straight, so that the contour of the triangular spring plate 501 becomes flat again and can pass through the V-shaped clip plate 701 again. After the triangular spring plate 501 passes through the V-shaped clip plate 701 from bottom to top, the outer sleeve 5 and the slump cone 7 will be disengaged from the limit. At this time, the operator can remove the slump cone 7 from the outer sleeve 5. This arrangement is to facilitate the user to clean, maintain and replace the slump cone 7 separately, thereby improving the service life of the device. Furthermore, in the above-mentioned operation process, a first avoidance groove 505 is opened on the triangular spring plate 501. The first avoidance groove 505 is used to avoid the displacement of the triangular spring plate 501 caused by the user pulling the buckle plate 504 upwards. Secondly, the second avoidance groove 506 on the triangular spring plate 501 is used to allow the outer sleeve 5 to avoid the partition 702 on the V-shaped clamping plate 701 during the downward pressing process. It is worth mentioning that the bending position of the recessed portion 502 is thinned. Such a setting makes the recessed portion 502 more easily deformed under the squeezing action of external force, thereby making it easier for the outer sleeve 5 and the slump cone 7 to be clamped and fixed.

[0066] In this embodiment, if Figures 12 to 17As shown, the bottom of the inner sleeve 6 is fixedly connected with an expansion plate 601, and a weakening groove 602 is provided at the connection position between the expansion plate 601 and the inner sleeve 6. An elastic rod 603 is installed on the inner wall of the expansion plate 601, and both ends of the elastic rod 603 are clamped with a stretching plate 605. The elastic rod 603 is a curved elastic structure, and a connecting rod 604 is fixedly connected to the middle position of the elastic rod 603. One side of the connecting rod 604 is fixed to the inner wall of the expansion plate 601, and both ends of the stretching plate 605 are provided with a clamping groove 606 that matches the size of the elastic rod 603. The inner sleeve 6 and the sample tube 2 are screwed and fixed together as described above, so the process of the outer sleeve 5 driving the slump cone 7 to move upward In the embodiment, the inner sleeve 6 will not be displaced, and an expansion plate 601 is arranged at the end of the inner sleeve 6. The expansion plate 601 is a segmented structure, and a weakening groove 602 is arranged at the connection position of the expansion plate 601 and the inner sleeve 6. The weakening groove 602 thins the connection position of the two, so that the expansion plate 601 is more likely to deform under the extrusion of external force. An elastic rod 603 is installed on the inner wall of the expansion plate 601. The elastic rod 603 is a curved elastic structure. The middle position of the elastic rod 603 is fixed to the expansion plate 601 by a connecting rod 604, and the rest of the elastic rod 603 is not fixed to the expansion plate 601. The two ends of the elastic rod 603 are clamped and fixed to the stretching plate 60 5. Before the slump cone 7 is lifted, the expansion plate 601 is located at the top of the slump cone 7. During the lifting process of the slump cone 7, the inner sleeve 6 will gradually extend into the interior of the slump cone 7. Since the slump cone 7 is a conical structure, the elastic force of the elastic rod 603 will cause the stretching plate 605 to push the expansion plate 601 to deform and expand, and during the upward movement of the slump cone 7, the expansion plate 601 always contacts the inner wall of the slump cone 7. Since the stretching plate 605 is installed in the gap of the segmented structure of the expansion plate 601, the stretching plate 605 and the expansion plate 601 can form a whole circular cross-sectional profile. This arrangement allows the stretching plate 605 and the expansion plate 601 to The concrete adhered to the inner wall of the slump cone 7 is scraped off to prevent the concrete from remaining on the inner wall of the slump cone 7. The above arrangement makes it unnecessary to wait for the concrete to slide down automatically after the slump cone 7 is lifted, thereby ensuring that the concrete can fall off quickly after the slump cone 7 is lifted. On the one hand, the accuracy of the detection is improved, and on the other hand, the detection time is shortened and the detection efficiency is improved. Here, the expansion plate 601 is made of rubber material, and the selection of this material makes the expansion plate 601 more easily deformed. The elastic rod 603 and the stretching plate 605 are fixed by the snap-in groove 606. This connection method allows the stretching plate 605 to be disassembled separately for cleaning and replacement, thereby increasing the service life of the device.

[0067] The working principle of the technical solution provided by the present invention is as follows:

[0068] When it is necessary to test the concrete, first place the slump cone 7 at the center of the test plate 301, and then the operator starts the lifting assembly. After the lifting assembly is started, the outer sleeve 5 will be driven to move downward for a distance. During the downward movement of the outer sleeve 5, the triangular spring plate 501 will be snapped into the V-shaped snap-on plate 701. The outline of the V-shaped snap-on plate 701 is a "V"-shaped structure, and the setting of this structure is just adapted to the triangular outline of the triangular spring plate 501. Therefore, when the outer sleeve 5 moves downward, the triangular spring plate 501 will be squeezed and deformed by the V-shaped snap-on plate 701, and its body shape will become flat during the deformation process. During the continuous downward movement of the outer sleeve 5, the flattened triangular spring plate 501 will pass through the gap at the bottom of the V-shaped snap-on plate 701 until the triangular spring plate 501 completely passes through the V-shaped snap-on plate After the plate 701 is released, the triangular spring plate 501 will recover its deformation under the action of elasticity. At this time, the triangular spring plate 501 and the V-shaped clamping plate 701 will form a clamping adaptation in structure, so that the outer sleeve 5 and the slump cone 7 are clamped together. When the two are clamped and fixed, the outer sleeve 5, the slump cone 7 and the lifting mechanism 4 become a whole driving structure. At this time, the slump cone 7 can be assisted by the outer sleeve 5. After the operator opens the electric control valve 201, the concrete in the body 1 is loaded into the slump cone 7 along the sample tube 2 and the inner sleeve 6 in turn. Under the limiting action of the outer sleeve 5, the stability of the slump cone 7 can be improved, thereby ensuring that the slump cone 7 will not swing during the concrete filling process, and then the concrete will not leak sideways, thereby improving the accuracy of the detection of the detection component.

[0069] When the concrete is filled, the lifting assembly drives the outer sleeve 5 to drive the slump cone 7 to move upward. During the upward movement of the slump cone 7, the concrete inside it will collapse on the detection plate 301. When the concrete in the slump cone 7 no longer collapses or the slump time reaches 30 seconds, the operator can measure and record the data. Since the centers of the outer sleeve 5, the slump cone 7 and the detection plate 301 are all on the same axis, the slump cone 7 is always kept vertical to the detection plate 301 during the lifting process, so that the data obtained by the test is more accurate. Since the inner sleeve 6 and the sample tube 2 are screwed together, the inner sleeve 6 is screwed together during the upward movement of the slump cone 7 driven by the outer sleeve 5. No displacement will occur. An expansion plate 601 is arranged at the end of the inner sleeve 6. The expansion plate 601 is a segmented structure. A weakening groove 602 is arranged at the connection position of the expansion plate 601 and the inner sleeve 6. The weakening groove 602 thins the connection position between the two, so that the expansion plate 601 is more likely to deform under the extrusion of external force. An elastic rod 603 is installed on the inner wall of the expansion plate 601. The elastic rod 603 is a curved elastic structure. The middle position of the elastic rod 603 is fixed to the expansion plate 601 through a connecting rod 604. The rest of the elastic rod 603 is not fixed to the expansion plate 601. The two ends of the elastic rod 603 are clamped and fixed with a stretching plate 605. Before the slump cone 7 is lifted, the expansion plate 601 is located at the top of the slump cone 7. During the lifting process of the slump cone 7, the inner sleeve 6 will gradually extend into the interior of the slump cone 7. Since the slump cone 7 is a conical structure, the elastic force of the elastic rod 603 will cause the stretching plate 605 to push the expansion plate 601 to deform and expand outward, and during the upward movement of the slump cone 7, the expansion plate 601 always contacts the inner wall of the slump cone 7. Since the stretching plate 605 is installed in the gap of the segmented structure of the expansion plate 601, the stretching plate 605 and the expansion plate 601 can form a whole circular cross-sectional profile. This arrangement allows the stretching plate 605 and the expansion plate 601 to collapse the slump cone 7. The concrete adhered to the inner wall of the slump cone 7 is scraped off to prevent the concrete from remaining on the inner wall of the slump cone 7. The above arrangement makes it unnecessary to wait for the concrete to slide down automatically after the slump cone 7 is lifted, ensuring that the concrete can fall off quickly after the slump cone 7 is lifted. On the one hand, the accuracy of the detection is improved, and on the other hand, the detection time is shortened and the detection efficiency is improved. Here, the expansion plate 601 is made of rubber material, and the selection of this material makes the expansion plate 601 more likely to deform. The elastic rod 603 and the stretching plate 605 are fixed by the clamping groove 606. This connection method allows the stretching plate 605 to be disassembled separately for cleaning and replacement, thereby increasing the service life of the device.

[0070] When the detection component is used up, the user can pull up the buckle plate 504 on the top of the triangular spring plate 501 to release the limit between the triangular spring plate 501 and the V-shaped clamping plate 701. Specifically, after the buckle plate 504 is pulled up, the triangular spring plate 501 will be deformed. At this time, the concave portion 502 on the top of the triangular spring plate 501 will become straight under the pulling action of the buckle plate 504. At the same time, the inclined structures on both sides of the triangular spring plate 501 will also become straight, so that the contour of the triangular spring plate 501 becomes flat again and can pass through the V-shaped clamping plate 701 again. After passing through the V-shaped clamping plate 701 from bottom to top, the outer sleeve 5 and the slump cone 7 will be out of the limit position, and the operator can remove the slump cone 7 from the outer sleeve 5. This arrangement is to facilitate the user to clean, maintain and replace the slump cone 7 separately, thereby improving the service life of the device. The user can inject clean water into the sample tube 2 through the water pipe 202 to rinse and clean the concrete remaining on the inner wall of the sample tube 2, so as to facilitate the next use. The clean water discharged from the sample tube 2 can also clean the detection component, thereby improving the use efficiency of the entire device.

[0071] The present invention covers any substitution, modification, equivalent method and scheme made on the essence and scope of the present invention. In order to make the public have a thorough understanding of the present invention, specific details are described in detail in the following preferred embodiments of the present invention, but those skilled in the art can fully understand the present invention without the description of these details. In addition, in order to avoid unnecessary confusion about the essence of the present invention, well-known methods, processes, procedures, components and circuits are not described in detail.

[0072] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principle of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A method for preparing high-strength self-compacting concrete, characterized in that: The following steps are involved: Step 1: Material preparation: Use metering equipment to accurately measure cementitious materials, aggregates, admixtures and water. The gel material mainly includes silicate cement or ordinary silicate cement. According to the product requirements of the project, it also includes fly ash, granulated blast furnace slag powder, silica fume and other mineral admixtures; the aggregate includes coarse aggregate and fine aggregate. The coarse aggregate is continuously graded, and the maximum nominal particle size should not be greater than 20mm. Medium sand is used as fine aggregate; the admixture mainly includes high-efficiency water reducing agent, as well as expansion agent, air entraining agent and defoaming agent; Step 2: Mix design: Design the mix ratio according to the project requirements. The self-compacting performance, strength, durability, etc. should be considered in the mix design. First, determine the concrete mix strength (fcu,o), fcu,o = fcu,k + 1.645σ, where fcu,k is the standard value of concrete cube compressive strength and σ is the standard deviation of concrete strength; then determine the water-cement ratio, which is determined according to the regression coefficient and the type of stone to ensure the durability of the concrete. The water-cement ratio is less than 0.45, and the amount of cementitious material should be controlled at 400kg / m 3 Up to 550kg / m 3 Then select the unit mixing water consumption of concrete, which is determined based on the hardness and plasticity of concrete; finally add appropriate amount of mineral admixtures, such as fly ash, granulated blast furnace slag powder, silica fume, etc. to adjust the rheological properties of concrete; Step 3: Mixing: Use a mixer to mix fine aggregate and coarse aggregate evenly, then add sodium polyacrylate, dispersant, expansion agent, limestone powder particles, cement and mix evenly, finally add water reducer and mix evenly, then add water and mix evenly, the mixing time shall not be less than 60 seconds, and shall be appropriately longer than that of non-self-compacting concrete; Step 4: Sampling and testing: Use a sampling bucket to take samples from the mixer. After ensuring that the inner wall of the slump cone and the bottom plate are moistened and free of visible water, place the slump cone on a solid and horizontal bottom plate testing surface. The slump cone is placed in the center of the bottom plate. The operator steps on the pedals on both sides of the slump cone to ensure that the slump cone remains in a fixed position during the loading process. Fill the materials in the sampling bucket into the slump cone. After the materials are filled, remove the loading funnel on the top of the slump cone, scrape off the excess concrete mixture and smooth it along the mouth of the cone. Then the operator lifts the slump cone vertically and steadily. After the materials in the slump cone are completely removed, place the slump cone gently next to the sample. When the sample on the bottom plate no longer collapses or the slump time reaches 30 seconds, the operator observes, measures and records the data. Step 5. Transportation and pouring: Use concrete mixer trucks to transport materials that meet the project requirements to the project site, and take measures such as sun protection and cold protection during transportation. When pouring self-compacting concrete, a dedicated person will monitor on-site to ensure that the self-compactness of the concrete meets the requirements. After the self-compacting concrete is poured, timely adopt maintenance measures such as covering, water storage, film moisturizing, spraying or brushing curing agents, and the maintenance time shall not be less than 14 days.

2. The method for preparing high-strength self-compacting concrete according to claim 1, characterized in that: The mixer comprises a body and a mounting plate, the bottom of the body is fixedly connected to a frame, one side of the bottom of the body is fixedly connected to a sample tube, the top of the sample tube is fixedly connected to a water pipe, the sample tube is fixedly connected to an electric control valve, the bottom of the mounting plate is fixedly connected to a detection plate, and a slump cone is placed on the top of the detection plate; A detection component is used to detect the slump and expansion of concrete in the body, and the detection component is connected to the sample tube and the mounting plate respectively.

3. The method for preparing high-strength self-compacting concrete according to claim 2, characterized in that: The detection assembly includes an inner sleeve screwed on the bottom of the sample tube, and also includes a lifting mechanism fixedly connected to one side of the mounting plate, one side of the lifting mechanism is fixedly connected to a mounting frame, and one end of the mounting frame is fixedly connected to an outer sleeve.

4. The method for preparing high-strength self-compacting concrete according to claim 3, characterized in that: A triangular spring plate is fixedly connected to the bottom of the outer sleeve, and a V-shaped clamping plate matched with the contour of the triangular spring plate is fixedly connected to the top of the slump cone.

5. The method for preparing high-strength self-compacting concrete according to claim 4, characterized in that: A recessed portion is provided on the top of the triangular spring plate, a connecting plate is symmetrically installed on the top of the triangular spring plate, and a buckle plate is fixedly connected to the top of the connecting plate.

6. The method for preparing high-strength self-compacting concrete according to claim 4, characterized in that: A partition is fixedly connected to the inner circumference of the V-shaped clamping plate, a second avoidance groove matched with the size of the partition is opened at the bottom of the outer sleeve, and a first avoidance groove is opened at the installation position of the triangular spring plate on the outer sleeve.

7. The method for preparing high-strength self-compacting concrete according to claim 3, characterized in that: The outer sleeve is a hollow frame structure, and the outer sleeve and the mounting frame are an integrally manufactured structure.

8. The method for preparing high-strength self-compacting concrete according to claim 3, characterized in that: An expansion plate is fixedly connected to the bottom of the inner sleeve, a weakening groove is provided at the connection position between the expansion plate and the inner sleeve, an elastic rod is installed on the inner wall of the expansion plate, and stretching plates are clamped at both ends of the elastic rod.

9. The method for preparing high-strength self-compacting concrete according to claim 8, characterized in that: The elastic rod is a curved elastic structure, a connecting rod is fixedly connected to the middle position of the elastic rod, and one side of the connecting rod is fixed to the inner wall of the expansion plate.

10. The method for preparing high-strength self-compacting concrete according to claim 8, characterized in that: Both ends of the stretching plate are provided with clamping grooves matched with the size of the elastic rod.

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