A method for detecting surface fluidity of self-compacting concrete

Abstract

The present invention discloses a method for detecting the surface fluidity of self-compacting concrete. By setting and utilizing a detection device, the fluidity of the surface of self-compacting concrete with a certain depth can be detected. By regularly detecting the surface fluidity of the concrete, the loss process of the surface fluidity of the concrete can be obtained, thereby finding a suitable concrete pouring interval time, ensuring that the upper and lower layers of concrete can be well integrated, providing guidance for the concrete construction plan, and ensuring the quality of concrete pouring.

Description

Technical Field

[0001] The present invention relates to the technical field of bridge engineering, and more specifically, to a method for detecting the surface fluidity of self-compacting concrete. Background Art

[0002] Self-compacting concrete has good fluidity, can fill the formwork by its own gravity, has good density, does not require vibration, and is widely used in engineering. Concrete generally requires continuous pouring, but due to some objective reasons, it is impossible to pour continuously. Concrete needs to be poured in batches. When the interval between the previous and the next pouring is too long, the surface of the lower layer of concrete after pouring is easy to lose water and become hard in high temperature, light, wind and other environments. The upper and lower layers of concrete cannot be well integrated, and stratification (cold joints) will occur, affecting the quality of the concrete interface.

[0003] Ordinary concrete needs to be vibrated during pouring and generally does not have the above-mentioned quality problems. When self-compacting concrete is poured in batches, the interval time between the two pourings must be strictly controlled to ensure that the concrete surface does not lose water and dry out, and has good fluidity and self-compactness. There is currently no method for detecting and evaluating the fluidity of the concrete surface. At this stage, the inspectors use their hands to feel the non-batch pouring of self-compacting concrete directly, which makes it easy to delay the judgment of the timing of air-drying and crusting. It is often necessary to determine the presence of air-drying crust only when the crusting reaches a certain degree. Summary of the invention

[0004] An object of the present invention is to solve at least the above problems and to provide at least the advantages which will be described hereinafter.

[0005] Another object of the present invention is to provide a method for detecting the surface fluidity of self-compacting concrete, so as to solve the technical problem that the prior art lacks an effective detection method for the surface fluidity of self-compacting concrete, resulting in the inability to determine the concrete pouring interval time, thereby affecting the quality of the self-compacting concrete pouring in batches.

[0006] In order to achieve these purposes and other advantages according to the present invention, a method for detecting the surface fluidity of self-compacting concrete is provided, comprising the following steps:

[0007] S1. Select a container with an open upper surface and pour a layer of self-compacting concrete in the container;

[0008] S2. Use a detection device to detect the fluidity of the self-compacting concrete surface. The detection device includes a vertical rod. A steel plate is fixed to the bottom of the vertical rod along the coaxial direction. The steel plate is a centrally symmetrical flat plate structure and is arranged horizontally. The detection device is placed 10 cm above the detection position of the steel plate on the concrete surface. The detection device is freely lowered to make the steel plate touch the surface of the self-compacting concrete. After the touch, the detection device is quickly lifted up. The operation is repeated several times. If ripples are formed when touching, it indicates that the surface of the self-compacting concrete at the detection position has not lost water and dried up, and has good fluidity. Otherwise, it indicates that the fluidity is poor and casting stratification is prone to occur.

[0009] S3. Set intervals to continuously test the surface fluidity of self-compacting concrete and record the test results. Each test should be conducted on a fresh concrete surface.

[0010] S4. The test is carried out until no ripples can be aroused on the surface of the self-compacting concrete. The time from the pouring of the self-compacting concrete to the last arousal of ripples is taken as the maximum interval time for pouring the self-compacting concrete.

[0011] Preferably, the detection interval is set to 10 minutes for self-compacting concrete in an environment where the air-drying time is not less than 1 hour, and the detection interval is set to 5 minutes for self-compacting concrete in an environment where the air-drying time is less than 1 hour.

[0012] Preferably, the steel plate is rectangular or circular with a side length of 10 cm.

[0013] Preferably, the spacing distance between adjacent detection locations is not less than 40 cm.

[0014] Preferably, the detection location is arranged in a ring shape on a horizontal plane corresponding to the shape of the inner side of the container.

[0015] Preferably, a plurality of the detection locations are arranged inside the container, and the detection locations on each side are arranged in a row to form a detection line, and a support system is set up correspondingly, and the detection device is positioned at each detection location through the support system, and the support system includes:

[0016] A plurality of support rods are vertically arranged and symmetrically arranged along the central axis of the container on the outside of the container, the height of the support rods is greater than the length of the vertical rods, the bottom of the support rods is used for temporary fixed connection with the ground, and a circle of shelves is radially arranged outward at the upper ends of the support rods;

[0017] A sleeve groove, which has an annular structure groove wall arranged in the horizontal direction, and the inner side of the groove wall is connected with a vertically arranged sleeve at intervals along the length direction, the inner diameter of the sleeve is larger than the diameter of the vertical rod and smaller than the outer diameter of the partition, and the sleeve and the upper end of the support rod are slidably matched in the vertical direction, wherein two sleeves are sleeved on the upper end of the support rod, and the bottom of the sleeve is placed on the corresponding partition;

[0018] When the support system is in use, first, according to the arrangement position of the detection points, support rods are symmetrically erected on the outside of the container, and the line connecting the two support rods is exactly located on a detection line. According to the position of each detection point on the detection line, a sleeve is installed, and each sleeve is located directly above a detection point. Then, sleeve grooves are jointly sleeved at the upper ends of the two support rods, and the sleeve grooves are placed on the shelves of the support rods. The vertical rod of the detection device held by hand is inserted into the sleeve of the first detection point from bottom to top. At this time, the position of the detection device corresponds to being located directly above one of the detection points.

[0019] Preferably, the groove walls on the two inner sides of each sleeve groove are provided with slide rails along the length direction, and the groove walls on each side are provided with positioning holes at intervals, and the intervals of the positioning holes are consistent with the intervals of the detection locations, each sleeve is slidably connected to the slide rails and each sleeve is symmetrically provided with spring buckles on the two sides facing the groove walls, and the spring buckles can extend into the positioning holes to limit the sleeve;

[0020] The number of sleeves is set according to the number of the detection locations that need to be measured simultaneously. Both ends of a sleeve are limited in the corresponding positioning holes by the corresponding spring buckles. The height of the partition is less than the length of the vertical rod. The vertical rod of the handheld detection device is inserted from bottom to top into the sleeve of the first detection location. After the detection of the current detection location is completed, the spring buckle is pressed toward the inner side of the sleeve groove to enter the inner side of the groove wall, and then the sleeve is moved along the slide rail to make the detection device reach directly above the next detection location.

[0021] Preferably, the upper end of the vertical rod is also clamped with an elastic clip, the maximum size of the elastic clip is larger than the inner size of the sleeve, and the vertical rod is temporarily placed on the top surface of the sleeve through the clamped elastic clip;

[0022] When the sleeve is moved along the slide rail, the detection device is temporarily placed on the top surface of the sleeve through the elastic clamp and moves synchronously with the sleeve.

[0023] The present invention includes at least the following beneficial effects: the method for detecting the surface fluidity of self-compacting concrete of the present invention can detect places at a certain depth that cannot be reached by people by using a detection device, and the loss process of the surface fluidity of concrete can be obtained by regularly detecting the surface fluidity of concrete, so as to find the appropriate concrete pouring interval time, ensure that the upper and lower layers of concrete can be well integrated, provide guidance for the concrete construction plan, ensure the quality of concrete pouring, and solve the problem of interface quality that is easy to occur when self-compacting concrete is poured in batches.

[0024] Other advantages, objectives and features of the present invention will be embodied in part through the following description, and in part will be understood by those skilled in the art through study and practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a structural schematic diagram of the detection device of the present invention;

[0026] Figure 2 It is a structural schematic diagram of the present invention when using the detection device to detect the self-compacting concrete;

[0027] Figure 3 A schematic diagram of the arrangement of a detection location according to an embodiment of the present invention;

[0028] Figure 4 A front structural diagram of a support system according to an embodiment of the present invention;

[0029] Figure 5 A top view of a support system according to an embodiment of the present invention;

[0030] Figure numerals in the specification: 1. detection device, 2. vertical rod, 3. steel plate, 4. container, 5. self-compacting concrete, 6. corrugation, 7. detection point, 8. support rod, 9. shelf, 10. sleeve groove, 11. groove wall, 12. sleeve, 13. slide rail, 14. locking hole, 15. spring buckle, 16. elastic clip. DETAILED DESCRIPTION

[0031] The present invention is further described in detail below in conjunction with the accompanying drawings so that those skilled in the art can implement the invention with reference to the description.

[0032] It should be noted that the experimental methods described in the following embodiments are conventional methods unless otherwise specified, and the reagents and materials are commercially available unless otherwise specified; in the description of the present invention, the terms "lateral", "longitudinal", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0033] like Figure 1-3 As shown, the present invention provides a method for detecting the surface fluidity of self-compacting concrete, comprising the following steps:

[0034] S1. Before the self-compacting concrete 5 is poured in batches, a concrete surface fluidity test is carried out under the same environmental conditions. A water tank container 4 with an upper surface opening and a volume of 2 cubic meters is selected, and a layer of self-compacting concrete 5 is poured in the container 4, and the timing is started at the same time.

[0035] S2. Use the detection device 1 to detect the surface fluidity of the self-compacting concrete 5. The detection device 1 includes a vertical rod 2. A steel plate 3 is fixed to the bottom of the vertical rod 2 along the coaxial direction. The steel plate 3 is a centrally symmetrical flat plate structure and is arranged horizontally. The vertical rod 2 can be connected to two steel pipes. The vertical rod 2 is welded to the steel plate 3 at the bottom. The length is determined according to needs. The vertical rod 2 is held by the detection personnel for easy detection. The detection device 1 is placed at a height of 710 cm from the detection point of the steel plate 3 on the concrete surface. The detection device 1 is freely lowered to make the steel plate 3 touch the surface of the self-compacting concrete 5. After touching, the detection device 1 is quickly lifted up. The operation is repeated 5 times and observed with the naked eye. If ripples 6 are formed when touching, it indicates that the surface of the self-compacting concrete 5 at the detection point 7 has not lost water and dried out, and has good fluidity. Otherwise, it indicates that the fluidity is poor and casting stratification is prone to occur.

[0036] S3. Regularly test and evaluate the surface fluidity of concrete. Set intervals to continuously test the surface fluidity of self-compacting concrete 5 and record the test results. Each test site 7 should be a fresh concrete surface.

[0037] S4, determining the maximum interval time of concrete pouring. The detection is performed until the ripples 6 cannot be aroused on the surface of the self-compacting concrete 5, and the time from the time of pouring the self-compacting concrete 5 to the time of the last arousal of the ripples 6 is taken as the maximum interval time of pouring the self-compacting concrete 5.

[0038] The size of the test container 4 is appropriately set larger as needed to ensure that there are enough detection points 7 that can be arranged. The self-compacting concrete 5 surface fluidity detection method of the present invention uses the detection device 1 to detect places with a certain depth that people cannot reach. By regularly detecting the surface fluidity of the concrete, the loss process of the surface fluidity of the concrete is obtained, thereby finding a suitable concrete pouring interval time, ensuring that the upper and lower layers of concrete can be well integrated, providing guidance for the concrete construction plan, ensuring the quality of concrete pouring, and solving the problem of interface quality that is prone to occur when the self-compacting concrete 5 is poured in batches.

[0039] In another technical solution, the detection interval for the self-compacting concrete 5 in an environment where the air-drying time is not less than 1 hour is set to 10 minutes, and the detection interval for the self-compacting concrete 5 in an environment where the air-drying time is less than 1 hour is set to 5 minutes.

[0040] Generally, concrete surfaces exposed to the air are easy to dry. Under relatively good conditions, a detection frequency of 10 minutes can basically achieve better detection results. If the environment is more severe, such as high temperature, light, strong wind, etc., the speed of air drying and crusting will be quite fast, and it may lose fluidity in 20 minutes. Therefore, the detection frequency needs to be increased to ensure the detection accuracy.

[0041] In another technical solution, Figure 1-3 As shown, the steel plate 3 is a rectangle or circle with a side length of 10 cm. This suitable size is selected to facilitate the ripples 6 and observation.

[0042] In another technical solution, Figure 3 As shown, the spacing between adjacent detection points 7 is not less than 40 cm. According to the structural size of the excited ripples 6, the influence range of the ripples 6 is approximately 40 cm. In order to prevent the previous detection from affecting the next detection, the distance between the measurement points should be not less than 40 cm.

[0043] In another technical solution, Figure 3 As shown, the detection part 7 is arranged in a ring shape on the horizontal plane corresponding to the shape of the inner side of the container 4, so as to facilitate the judgment of the uniformity of fluidity at various locations on the surface of the concrete poured each time.

[0044] In another technical solution, Figure 3-5 As shown, a plurality of the detection locations 7 are arranged inside the container 4, and the detection locations 7 on each side are arranged in a row to form a detection line, and a support system is set up accordingly, and the detection device 1 is positioned at each detection location 7 through the support system, and the support system includes:

[0045] A plurality of support rods 8 are vertically arranged and symmetrically arranged along the central axis of the container 4 on the outside of the container 4. The height of the support rods 8 is greater than the length of the vertical rods 2. The bottom of the support rods 8 is used for temporary fixed connection with the ground. The upper end of the support rods 8 is radially outwardly provided with a circle of shelves 9;

[0046] The sleeve groove 10 has an annular structure groove wall 11 arranged in the horizontal direction, and the inner side of the groove wall 11 is connected with a vertically arranged sleeve 12 at intervals along the length direction. The inner diameter of the sleeve 12 is larger than the diameter of the vertical rod 2 and smaller than the outer diameter of the shelf 9. The sleeve 12 and the upper end of the support rod 8 are slidably matched in the vertical direction, wherein two sleeves 12 are sleeved on the upper ends of the support rod 8, and the bottom of the sleeve 12 is placed on the corresponding shelf 9;

[0047] When the support system is in use, the support rods 8 are first symmetrically erected on the outside of the container 4 according to the arrangement position of the detection location 7, and the connecting line of the two support rods 8 is exactly located on a detection line, and a sleeve 12 is installed according to the position of each detection location 7 on the detection line, and each sleeve 12 is located directly above a detection location 7, and then a sleeve groove 10 is jointly sleeved on the upper ends of the two support rods 8, and the sleeve groove 10 is placed on the shelf 9 of the support rod 8. The vertical rod 2 of the handheld detection device 1 is inserted into the sleeve 12 of the first detection location 7 from bottom to top. At this time, the position of the detection device 1 corresponds to being located directly above one of the detection locations 7.

[0048] In this embodiment, a corresponding sleeve 12 can be set respectively according to the number and position requirements of the detection locations 7. The setting intervals of adjacent detection locations 7 are consistent with the setting intervals of adjacent sleeves 12, so that each sleeve 12 can be corresponded to the position of each detection location 7 one by one. Each time the detection device 1 needs to be switched to the next detection location 7, the detection device 1 is moved horizontally to the bottom of the next corresponding sleeve 12 and passed upward through the sleeve 12 to achieve rapid positioning. After that, the vertical rod 2 is continued to be held, and the vertical rod 2 is moved vertically to drive the steel plate 3 to a suitable height from the surface of the self-compacting concrete 5 at the detection location 7. In this process, the sleeve 12 can also serve as a guiding and limiting structure for the vertically moving vertical rod 2 within a certain range.

[0049] In another technical solution, Figure 4-5 As shown, the groove walls 11 on the two inner sides of each sleeve groove 10 are provided with slide rails 13 along the length direction, and the groove walls 11 on each side are provided with positioning holes 14 at intervals, and the intervals of the positioning holes 14 are consistent with the intervals of the detection positions 7, each sleeve 12 is slidably connected to the slide rails 13, and each sleeve 12 is symmetrically provided with spring buckles 15 on the two sides facing the groove walls 11, and the spring buckles 15 can be extended into the positioning holes 14 to limit the sleeve 12;

[0050] The number of the sleeves 12 is set according to the number of the detection locations 7 that need to be measured simultaneously. Both ends of a sleeve 12 are limited in the corresponding positioning holes 14 by the corresponding spring buckles 15. The height of the shelf 9 is less than the length of the vertical rod 2. The vertical rod 2 of the handheld detection device 1 is inserted into the sleeve 12 of the first detection location 7 from bottom to top. After the detection of the current detection location 7 is completed, the spring buckle 15 is pressed toward the inner side of the sleeve groove 10 to enter the inner side of the groove wall 11, and then the sleeve 12 is moved along the slide rail 13 to make the detection device 1 reach directly above the next detection location 7.

[0051] In this embodiment, the number of sleeves 12 can be reduced as needed, wherein the two outermost sleeves 12 are used to be sleeved and connected with the upper end of the support rod 8, and multiple sleeves 12 can be simultaneously arranged on the sleeve groove 10 as needed, and the detection device 1 corresponding to multiple detection locations 7 can be operated simultaneously, wherein each relatively arranged two positioning holes 14 constitutes a pair of positioning holes 14, and the interval of each pair of positioning holes 14 is designed according to the setting interval of the detection location 7. In order to improve the versatility of the bracket system, positioning holes 14 with small intervals and large numbers can be arranged. When it is necessary to position the detection device 1, after the vertical rod 2 of the detection device 1 passes through the sleeve 12 from the bottom, the spring buckle 15 is squeezed so that the sleeve 12 can move on the slide rail 13, and the sleeve 12 is operated to move synchronously with the vertical rod 2 to the desired position, and then the spring buckle 15 of the sleeve 12 is released to enter the positioning hole 14 at the corresponding position for temporary fixation, and then the detection device 1 is continued to be operated to excite the ripples 6, thereby further improving the efficiency of detection movement and positioning.

[0052] In another technical solution, Figure 4-5 As shown, the upper end of the vertical rod 2 is also clamped with an elastic clip 16, the maximum size of the elastic clip 16 is larger than the inner size of the sleeve 12, and the vertical rod 2 is temporarily placed on the top surface of the sleeve 12 through the clamped elastic clip 16;

[0053] When the sleeve 12 is moved along the slide rail 13, the detection device 1 is temporarily placed on the top surface of the sleeve 12 through the elastic clamp 16 and moves synchronously with the sleeve 12. In this way, the movement of the vertical rod 2 can be synchronously driven by applying force to the movement of the sleeve 12. After reaching a specific position, the elastic clamp 16 is released, and the detection device 1 can fall freely. After that, the detection device 1 can be quickly lifted manually, which improves the convenience of manual operation.

[0054] Although the embodiments of the present invention have been disclosed as above, they are not limited to the applications listed in the specification and the implementation modes, and they can be fully applied to various fields suitable for the present invention. For those familiar with the art, additional modifications can be easily implemented. Therefore, without departing from the general concept defined by the claims and the scope of equivalents, the present invention is not limited to the specific details and the illustrations shown and described herein.

Claims

1. A method for detecting the surface fluidity of self-compacting concrete. It is characterized in that The steps include: S1. Select a container with an open upper surface and pour a layer of self-compacting concrete in the container; S2. Use a detection device to detect the fluidity of the self-compacting concrete surface. The detection device includes a vertical rod. A steel plate is fixed to the bottom of the vertical rod along the coaxial direction. The steel plate is a centrally symmetrical flat plate structure and is arranged horizontally. The steel plate is a rectangle or circle with a side length of 10 cm. The detection device is placed 10 cm above the detection position of the steel plate on the concrete surface. The detection device is freely lowered to make the steel plate touch the surface of the self-compacting concrete. After the touch, the detection device is quickly lifted up. The operation is repeated several times. If ripples can be formed when touching, it indicates that the surface of the self-compacting concrete at the detection position has not lost water and dried up, and has good fluidity. Otherwise, it indicates that the fluidity is poor and casting stratification is prone to occur. S3, arranging a plurality of the detection locations inside the container, the detection locations on each side are arranged in a row to form a detection line, and a corresponding support system is set up, the detection device is positioned at each detection location through the support system, and the support system includes: A plurality of support rods are vertically arranged and symmetrically arranged along the central axis of the container on the outside of the container, the height of the support rods is greater than the length of the vertical rods, the bottom of the support rods is used for temporary fixed connection with the ground, and a circle of shelves is radially arranged outward at the upper ends of the support rods; A sleeve groove, which has an annular structure groove wall arranged in the horizontal direction, and the inner side of the groove wall is connected with a vertically arranged sleeve at intervals along the length direction, the inner diameter of the sleeve is larger than the diameter of the vertical rod and smaller than the outer diameter of the partition, and the sleeve and the upper end of the support rod are slidably matched in the vertical direction, wherein two sleeves are sleeved on the upper end of the support rod, and the bottom of the sleeve is placed on the corresponding partition; When using the support system, first, according to the arrangement position of the detection point, the support rods are symmetrically erected on the outside of the container, and the connection line of the two support rods is exactly located on a detection line. According to the position of each detection point on the detection line, a sleeve is installed, and each sleeve is located directly above a detection point. Then, sleeve grooves are jointly sleeved on the upper ends of the two support rods, and the sleeve grooves are placed on the shelves of the support rods. The vertical rod of the handheld detection device is inserted from bottom to top into the sleeve of the first detection point. At this time, the position of the detection device corresponds to being located directly above one of the detection points. The surface fluidity of the self-compacting concrete is tested at intervals and the test results are recorded. Each test site should be a fresh concrete surface, and the interval between adjacent test sites should not be less than 40 cm. S4. The test is carried out until no ripples can be aroused on the surface of the self-compacting concrete. The time from the pouring of the self-compacting concrete to the last arousal of ripples is taken as the maximum interval time for pouring the self-compacting concrete.

2. The method for detecting the surface fluidity of self-compacting concrete according to claim 1, It is characterized in that For self-compacting concrete in an environment where the air-drying time is not less than 1 hour, the detection interval is set to 10 minutes; for self-compacting concrete in an environment where the air-drying time is less than 1 hour, the detection interval is set to 5 minutes.

3. The method for detecting the surface fluidity of self-compacting concrete according to claim 1, It is characterized in that The detection portion is arranged in a ring shape on a horizontal plane corresponding to the shape of the inner side of the container.

4. The method for detecting the surface fluidity of self-compacting concrete according to claim 1, It is characterized in that The groove walls on the two inner sides of each sleeve groove are provided with slide rails along the length direction, and the groove walls on each side are provided with positioning holes at intervals, and the intervals of the positioning holes are consistent with the intervals of the detection positions, each sleeve is slidably connected to the slide rails and each sleeve is symmetrically provided with spring buckles on the two sides facing the groove walls, and the spring buckles can be extended into the positioning holes to limit the sleeve; The number of sleeves is set according to the number of the detection locations that need to be measured simultaneously. Both ends of a sleeve are limited in the corresponding positioning holes by the corresponding spring buckles. The height of the partition is less than the length of the vertical rod. The vertical rod of the handheld detection device is inserted from bottom to top into the sleeve of the first detection location. After the detection of the current detection location is completed, the spring buckle is pressed toward the inner side of the sleeve groove to enter the inner side of the groove wall, and then the sleeve is moved along the slide rail to make the detection device reach directly above the next detection location.

5. The method for detecting the surface fluidity of self-compacting concrete according to claim 4, It is characterized in that The upper end of the vertical rod is also clamped with an elastic clip, the maximum size of the elastic clip is larger than the inner size of the sleeve, and the vertical rod is temporarily placed on the top surface of the sleeve through the clamped elastic clip; When the sleeve is moved along the slide rail, the detection device is temporarily placed on the top surface of the sleeve through the elastic clamp and moves synchronously with the sleeve.

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