Device for testing flowing property of self-compacting concrete

Abstract

The invention provides a self-compacting concrete flowing property testing device, and solves the problems that when a self-compacting concrete working property testing device is used, the anti-segregation capability and the filling capability of self-compacting concrete cannot be tested, and the flowing property testing result is not comprehensive. The device comprises a bottom plate, a vertically-arranged first supporting rod is fixedly arranged at the top of the bottom plate, an annular storage groove is fixedly formed in the top of the bottom plate, and two detachable baffles arranged at intervals are inserted into the storage groove; the top of the first supporting rod is provided with a test plate which is horizontally and coaxially arranged, a slump cylinder is placed on the test plate, a plurality of circles of lifting rods which are distributed in a concentric circle at intervals are movably arranged on the test plate in a penetrating mode, a supporting plate is fixedly arranged on the first supporting rod, and a lifting pushing device capable of lifting up and down is arranged on the supporting plate; the top of the lifting pushing device abuts against the bottom of the lifting rod. The device can be used for comprehensively evaluating the flowability, segregation resistance and filling property of the self-compacting concrete.

Description

Technical Field

[0001] The present invention relates to the technical field of concrete, and particularly to a device for testing the fluidity performance of self-compacting concrete. Background Art

[0002] Self-compacting concrete (SelfCompactingConcrete or Self-Consolidating Concrete, abbreviated as SCC) refers to concrete that can flow and compact under its own gravity, can completely fill the formwork even in the presence of dense steel bars, and at the same time obtain good homogeneity without additional vibration.

[0003] In order to achieve self-compaction without vibration, the hardened self-compacting concrete needs to have good physical and mechanical properties like normal concrete. The prepared self-compacting concrete must meet the following requirements in the fluid state:

[0004] (1) Appropriate viscosity: After flowing through dense steel bars, it still maintains uniform composition. If the viscosity is too large, the large air bubbles retained in the concrete are not easily excluded; the viscosity is represented by the slump flow of the concrete, and it is required to be in the range of 500 - 700 mm. If the viscosity is too large, that is, the slump flow is less than 500 mm, it will bring certain difficulties in flowing through small gaps and filling the formwork; if the viscosity is too small, that is, the slump flow is greater than 700 mm, segregation is likely to occur.

[0005] (2) Good stability: It does not segregate or bleed before and after pouring, the coarse and fine aggregates are evenly distributed, maintaining the homogeneity of the concrete structure, enabling good bonding between the cement paste and the aggregates, and between the concrete and the steel bars, and maintaining the durability of the concrete.

[0006] Therefore, before use, it is necessary to test the fluidity of the prepared self-compacting concrete. The fluidity test of self-compacting concrete is mainly carried out through the following several methods to ensure that it can fill the formwork and wrap the steel bars under its own gravity without mechanical vibration:

[0007] (1) Slump flow test, used to evaluate the fluidity and filling ability of the concrete;

[0008] (2) J-ring test, testing the ability of self-compacting concrete to pass through the steel bar gap (anti-blocking property);

[0009] (3) L-box test, used to test the fluidity and segregation resistance of self-compacting concrete;

[0010] (4) V-funnel test, used to test the flow rate and anti-blocking property of self-compacting concrete;

[0011] (5) U-box test, used to test the filling ability of self-compacting concrete to pass through dense steel bars;

[0012] In actual testing, the above test methods can be selected according to engineering requirements, and the test results must comply with design specifications (such as EFNARC, ASTM C1611 or EN 12350-8 / 12).

[0013] However, when conducting the above-mentioned tests, since the fluidity test of self-compacting concrete requires a large number of people, the human error is greatly increased, affecting the accuracy of the test results. In order to solve the above problems, the invention patent with application number 202011277730.8 discloses a self-compacting concrete working performance test device and test method. The invention can test the fluidity, filling capacity and anti-blocking of self-compacting concrete by cleverly combining the V-funnel test and the slump expansion test. However, the invention still has the following shortcomings when used: (1) It is impossible to test the anti-segregation ability of self-compacting concrete and its filling capacity through dense steel bars, and the fluidity test results are not comprehensive; (2) When testing the slump expansion test, in order to ensure the slump expansion test, the self-compacting concrete must be tested. In order to fill the slump cone with self-compacting concrete, it is generally necessary to ensure that the self-compacting concrete in the slump cone is filled to a small extent, and then use a scraper to gently level the self-compacting concrete portion that overflows the top of the slump cone, and clean up the excess concrete that overflows to the bottom plate. In this invention, although a receiving tray is used to receive the excess self-compacting concrete flowing out of the V-funnel to avoid excessive self-compacting concrete from being poured into the slump cone, the subsequent operations of leveling the self-compacting concrete portion that overflows the top of the slump cone and cleaning up the excess concrete that overflows to the bottom plate are still relatively troublesome. Summary of the invention

[0014] In order to solve the problems that the self-compacting concrete working performance testing device in the background technology cannot test the anti-segregation ability and filling ability of the self-compacting concrete when in use, and the fluidity test result is incomplete, the present invention proposes a self-compacting concrete fluidity performance testing device.

[0015] The technical scheme of the present invention is: a self-compacting concrete flow performance testing device, comprising a bottom plate, a plurality of first rollers and height-adjustable adjustment legs are arranged at the bottom of the bottom plate, a vertically arranged first support rod is fixedly arranged at the top of the bottom plate, a ring-shaped storage tank arranged around the first support rod is fixedly arranged at the top of the bottom plate, the vertical section of the storage tank is a U-shaped tank structure with an upper opening, two detachable and spaced baffles are inserted in the storage tank, the two baffles can isolate the space in the storage tank into two independent spaces, a sewage pipe is arranged on the outside of the storage tank, and a sewage valve is arranged on the sewage pipe;

[0016] The top of the first support rod is provided with a horizontally and coaxially arranged test plate. The test plate is a circular plate structure with a diameter of not less than 850 mm. A first magnet block is embedded in the test plate and arranged around the first support rod. The outer peripheral surface of the test plate is directly above the storage tank;

[0017] A slump cone that can be adsorbed and fixed by the first magnet block is placed on the test plate;

[0018] A number of lifting rods are movably inserted through the test plate and are distributed at intervals in concentric circles. The upper end surfaces of the lifting rods are flush with the upper surface of the test plate, and the lower end surfaces of the lifting rods are located below the test plate. A number of second magnet blocks are arranged at the bottom of the test plate around the lifting rods. A base made of magnetic metal is fixedly provided at the lower end of the lifting rod, and the base corresponds to the second magnet block up and down;

[0019] A horizontally arranged support plate is fixedly provided on the first support rod. An elevating push device that can move up and down is provided on the support plate. The top of the elevating push device abuts against the bottom of the base, and the elevating push device can push the base to the position of the second magnet block;

[0020] A pumping system and a power supply box are provided on the support plate. The pumping system includes a concrete inlet end and a concrete outlet end. The concrete inlet end is located inside the storage tank, and the concrete outlet end is embedded in the test plate, and the outlet end of the pumping system is located inside the slump cone;

[0021] A vertically arranged vertical rod is fixedly provided on the left side of the bottom plate. A handrail and a controller are fixedly provided on the left side of the vertical rod. The controller is electrically connected to the power supply box, and the controller is control-connected to the pumping system.

[0022] Preferably, the pumping system includes a concrete pump fixedly provided on the support plate. The suction port of the concrete pump is connected to one end of the first suction pipe. A first solenoid valve is provided on the first suction pipe, and the other end of the first suction pipe penetrates into the storage tank;

[0023] The discharge port of the concrete pump is connected to one end of the pumping pipe. The other end of the pumping pipe penetrates through the test plate and is located inside the slump cone. A digital pressure gauge, an electric control valve, and a check valve are sequentially arranged on the pumping pipe from bottom to top;

[0024] The digital pressure gauge is communicatively connected to the controller, and the controller is control-connected to the first solenoid valve and the electric control valve.

[0025] Preferably, a water tank with an upper opening is formed by enclosing the inner side of the storage tank and the bottom plate;

[0026] The pumping system further includes a second suction pipe. One end of the second suction pipe is connected to the first suction pipe, and the connection node between the second suction pipe and the first suction pipe is located between the first solenoid valve and the inlet end of the concrete pump. A second solenoid valve is provided on the second suction pipe, the other end of the second suction pipe is inserted into the water tank, and the controller is connected to control the second solenoid valve.

[0027] Preferably, a circular T marking line concentric with it is provided on the upper surface of the test plate. The diameter of the T marking line is 500 mm, and the lifting rod is located inside the T marking line.

[0028] A first diffuse reflection photoelectric sensor located outside the first magnet block is embedded in the test plate, and four second diffuse reflection photoelectric sensors are embedded in the test plate and arranged at equal intervals along the circumference of the T marking line.

[0029] Both the first diffuse reflection photoelectric sensor and the second diffuse reflection photoelectric sensor are signal-connected to the controller, and a timer is built into the controller.

[0030] Preferably, a second sliding block capable of sliding up and down is provided on the vertical rod. A first connecting rod extending to the right is fixedly connected to the second sliding block, and the end of the first connecting rod away from the second sliding block is fixedly connected to the side of the slump cone.

[0031] A lifting device is provided on the vertical rod. One end of the lifting device is fixedly connected to the second sliding block, and the lifting device is used to pull the second sliding block upward to lift the slump cone.

[0032] Preferably, a detachable tray is provided at the top of the slump cone. The tray includes a chassis and an annular retaining edge provided on the periphery of the chassis. The top of the annular retaining edge is higher than the upper surface of the chassis. An overflow hole penetrating up and down is provided on the chassis, and the diameter of the chassis is larger than the diameter of the upper port of the slump cone.

[0033] A plurality of springs that naturally hang downward are fixedly provided on the outside of the annular retaining edge. The lower ends of the springs are fixedly provided with second hanging rings, and a plurality of third hanging rods are fixedly provided on the outside of the slump cone. The second hanging rings can be hung on the third hanging rods after pulling the springs to elongate.

[0034] Preferably, the test plate includes a central circular plate and a movable ring plate rotatably connected to the outside of the central circular plate. The central circular plate is fixedly provided at the top of the first support rod, and the lifting rod and the T marking line are both located on the movable ring plate.

[0035] Preferably, both the first magnet block and the slump cone are located on the movable ring plate. The concrete outlet end of the pumping system is located on the central circular plate, and the outlet end of the pumping system corresponds to the inner side plate of the slump cone up and down.

[0036] Preferably, the lifting and pushing device includes a seesaw hinged to the top of the support plate. The hinge point between the seesaw and the support plate is located between the left and right ends of the seesaw, and the seesaw is located on the right side of the first support plate.

[0037] A first support rod is sleeved with a first supporting plate that can move up and down. The first supporting plate is movably abutted against the bottom of the base at the lower end of the lifting rod, and a rotatable ball is embedded in the bottom of the base.

[0038] The bottom of the first supporting plate is fixedly connected with a second connecting rod extending downward. The bottom of the second connecting rod is fixedly provided with a second roller, and the bottom of the second roller is abutted against the seesaw. The second connecting rod is located on the left side of the hinge point between the seesaw and the support plate.

[0039] Preferably, two sliding members that can slide along the circumferential direction of the storage tank are provided inside the storage tank. The top of the sliding member is provided with an inserting frame that can rotate in the horizontal plane. The inserting frame can rotate to directly above the notch of the storage tank. The inserting frame is provided with a through slot from top to bottom, and the baffle can be movably inserted into the slot. The top of the baffle is fixedly provided with a handle.

[0040] When the baffle is inserted into the slot, the bottom and the left and right side surfaces of the baffle are respectively in sliding contact with the bottom of the storage tank and the left and right side surfaces inside the storage tank.

[0041] The top of the inserting frame is provided with a limiting member that can rotate in the horizontal plane. The limiting member can rotate to the top of the baffle to limit the upward movement of the baffle.

[0042] Advantages of the present invention: The present invention can perform a slump flow test through the cooperation of the slump cone and the test plate to test the fluidity and filling ability of self-compacting concrete. Through the simultaneously conducted T50 test, the flow performance of self-compacting concrete is tested. Through the cooperation of the lifting rod and the slump cone, the anti-blocking property and filling ability of self-compacting concrete are completed. Through the two baffles in the storage tank, the anti-segregation property of self-compacting concrete can be tested, thereby completing a comprehensive evaluation of the fluidity, anti-segregation property, and filling property of self-compacting concrete.

[0043] At the same time, according to the actual steel bar arrangement density, the lifting rods distributed in multiple circles can be arbitrarily pulled out as required, the orientation and density of the lifting rods can be arranged, and the experiment can be carried out again to test whether the self-compacting concrete meets the on-site requirements. BRIEF DESCRIPTION OF THE DRAWINGS

[0044] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0045] Figure 1 It is a schematic diagram of the main structure of Embodiment 1;

[0046] Figure 2 The Figure 1 schematic diagram of the internal structure of the test board in a top-down view;

[0047] Figure 3 is Figure 1 the enlarged view of the structure at position A in

[0048] Figure 4 is Figure 1 the enlarged view of the structure at position B in

[0049] Figure 5 is Figure 1 the enlarged view of the structure at position C in

[0050] Figure 6 is Figure 1 the enlarged view of the structure at position D in

[0051] Figure 7 is Figure 1 the schematic diagram of the support plate and the pumping system thereon in

[0052] Figure 8 is Figure 1 the enlarged view of the structure at position E in

[0053] Figure 9 is Figure 1 the enlarged view of the structure at position F in

[0054] Figure 10 is Figure 1 the enlarged view of the structure at position G in

[0055] In the figure, 1 is the bottom plate, 2 is the first roller, 3 is the adjusting leg, 4 is the storage tank, 401 is the first chute, 5 is the water storage tank, and 6 is the first support rod;

[0056] 7 is the test board, 701 is the central circular plate, 702 is the moving ring plate, 703 is the placement groove, and 704 is the second magnet block;

[0057] 8 is the T50 marking line, 9 is the second diffuse reflection photoelectric sensor, 10 is the first lifting rod, 11 is the second lifting rod, 12 is the first magnet block, 13 is the slump cone, 14 is the first connecting rod, 15 is the second slider, 16 is the vertical rod, 17 is the second chute, 18 is the fixed pulley, 19 is the pulling rope, 20 is the first hanging ring, 21 is the first hanging rod, 22 is the second hanging rod, 23 is the first supporting plate, 24 is the base, 25 is the ball, 26 is the second connecting rod, and 27 is the second roller;

[0058] 28 is the seesaw, 2801 is the first horizontal plate section, 2802 is the ear plate, 2803 is the inclined plate section, 2804 is the second horizontal plate section, and 2805 is the anti-slip pad;

[0059] 29. Support plate, 30. Second support rod, 31. Limit rod, 32. Concrete pump, 33. First suction pipe, 34. First solenoid valve, 35. Pumping pipe, 36. Digital pressure gauge, 37. Electric control valve, 38. Check valve, 39. Second suction pipe, 40. Second solenoid valve, 41. Power supply box, 42. Second support plate, 43. Second slider, 44. Insertion rack, 4401. Slot, 45. Baffle plate, 46. Handle, 47. Lead screw, 48. Lead screw sleeve, 49. Limit plate, 50. Sewage pipe, 51. Sewage valve;

[0060] 52. Tray, 5201. Conical side plate, 5202. Overflow hole, 53. Spring, 54. Second hanging ring, 55. Third hanging rod;

[0061] 56. Handrail, 57. Controller, 58. Second diffuse reflection photoelectric sensor. Specific implementation mode

[0062] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying 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 the embodiments. 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.

[0063] Embodiment 1: Self-compacting concrete fluidity test device, as Figure 1 shown, including a bottom plate 1. A plurality of first rollers 2 and adjustable-height adjusting legs 3 are provided at the bottom of the bottom plate 1. In this embodiment, the adjusting legs 3 adopt the cooperation mode of a lead screw and a threaded sleeve to disengage the first rollers 2 from the ground or make them land on the ground, realizing the jacking and leveling of the bottom plate 1.

[0064] A storage tank 4 in a ring shape surrounding the first support rod 6 is fixedly provided at the top of the bottom plate 1. The vertical cross-section of the storage tank 4 is a U-shaped groove structure with an upper opening. The storage tank 4 is used to store the self-compacting concrete to be tested and the excess self-compacting concrete and sewage flowing down from the test plate. A sewage pipe 50 is provided outside the storage tank 4, and a sewage valve 51 is provided on the sewage pipe 50.

[0065] In order to be able to test the segregation resistance of the self-compacting concrete using the storage tank 4 and to scrape and clean the self-compacting concrete adhered to the inner wall of the storage tank 4, as Figure 1 , Figure 8 and Figure 9As shown in the figure, two sliding members capable of sliding along the circumferential direction are provided inside the storage tank 4. Specifically, an annular first sliding groove 401 is formed inside the storage tank 4. The first sliding groove 401 is of a dovetail groove structure. A sliding member is slidably provided in the first sliding groove 401. The sliding member includes a second slider 43 slidably arranged in the first sliding groove 401. A second support plate 42 with an L-shaped structure is fixedly provided on the second slider 43. A vertically arranged first rotating shaft is fixedly provided at the top of the second support plate 42. A plug rack 44 capable of rotating in the horizontal plane is rotatably sleeved on the first rotating shaft. The plug rack 44 is of a straight plate structure. The plug rack 44 can rotate to the position directly above the notch of the storage tank 4. A through slot 4401 is provided on the plug rack 44. A baffle 45 is movably inserted into the slot 4401. A handle 46 is fixedly provided at the top of the baffle 45. When the baffle 45 is inserted into the slot 4401, the bottom and the left and right side surfaces of the baffle 45 are respectively in sliding contact with the bottom and the left and right side surfaces inside the storage tank 4. The two baffles 45 can isolate the inner space of the storage tank 4 into two independent spaces.

[0066] Two limiting members arranged at intervals left and right and capable of rotating in the horizontal plane are provided at the top of the plug rack 44. The limiting members can rotate to the top of the baffle 45 to limit the upward movement of the baffle 45. Specifically, as Figure 8 and Figure 9 shown, the limiting member includes a lead screw 47 vertically arranged at the top of the plug rack 44. A nut sleeve 48 threadedly connected with the lead screw 47 is sleeved on the upper end of the lead screw 47. A limiting plate 49 is fixedly provided at the top of the nut sleeve 48. When the limiting plate 49 rotates, it can rotate to the position directly above the baffle 45 and can also rotate to the outside of the baffle 45.

[0067] A vertically arranged first support rod 6 is fixedly provided at the top of the bottom plate 1. A test plate 7 horizontally and coaxially arranged is provided at the top of the first support rod 6. In order to smoothly carry out the slump flow test, the test plate 7 needs to be a circular plate structure with a diameter of not less than 850 mm. In this embodiment, the test plate 7 selected has a diameter of 900 mm.

[0068] A circular T50 marking line 8 concentric with the test plate 7 is provided on the upper surface of the test plate 7. The diameter of the T50 marking line 8 is 500 mm.

[0069] In order to reduce the large error caused by manual timing when performing the T50 test (the time required for self-compacting concrete to slump to a diameter of 500 mm), in this embodiment, as Figure 1 and Figure 3As shown, the test board 7 is internally provided with a first diffuse reflection photoelectric sensor 58 located outside the first magnet block 12, and the test board 7 is internally provided with four second diffuse reflection photoelectric sensors 9 arranged at equal intervals along the circumferential direction of the T50 marking line 8. Both the first diffuse reflection photoelectric sensor 58 and the second diffuse reflection photoelectric sensor 9 are signal-connected to the controller 57, and the controller 57 is internally provided with a timer. When an object blocks above the first diffuse reflection photoelectric sensor 58, the controller 57 controls the timer to start timing. When an object blocks above the second diffuse reflection photoelectric sensor 9, the controller 57 controls the timer to stop timing.

[0070] To prevent the self-compacting concrete flowing out from the test board 7 from contaminating the equipment and the surrounding environment, the outer peripheral surface of the test board 7 is located directly above the storage tank 4, and the storage tank 4 can collect the self-compacting concrete flowing out from the test board 7.

[0071] The test board 7 is internally provided with a first magnet block 12 surrounding the first support rod 6, and a slump cone 13 that can be adsorbed and fixed by the first magnet block 12 is placed on the test board 7. The first magnet block 12 provides a downward suction force on the slump cone 13 to prevent the slump cone 13 from rising under the pushing action of the upwelling self-compacting concrete.

[0072] In order to be able to conduct a J-ring test outside the slump cone 13 to test the anti-blocking ability of the self-compacting concrete, and to arrange obstacles with different densities according to actual needs to test the filling ability of the self-compacting concrete when passing through dense steel bars. In this embodiment, as Figure 1 and Figure 2 shown, the test board 7 is provided with two concentric circles of through holes spaced apart. The through holes are distributed between the slump cone 13 and the T50 marking line 8. Lift rods that can be lifted and lowered are inserted into the through holes. The lift rods are located inside the T50 marking line 8. The inner diameter of the through holes is equal to the diameter of the lift rods, and the length of the lift rods is greater than the depth of the through holes. Among them, the lift rods include a first lift rod 10 located in the inner circle and a second lift rod 11 located in the outer circle. The upper end surfaces of the lift rods are flush with the upper surface of the test board 7, and the lower end surfaces of the lift rods are located below the test board 7.

[0073] In order to be able to fix the position of the lifted lift rods, as Figure 1 and Figure 5 shown, a plurality of placement grooves 703 are opened at the bottom of the test board 7, which are in one-to-one vertical correspondence and communication with the tops of the through holes. A second magnet block 704 surrounding the lift rods is embedded at the top of the placement grooves 703. A base 24 made of magnetic metal is fixedly provided at the lower end of the lift rod, and the base 24 corresponds to the second magnet block 704 up and down.

[0074] A horizontally arranged support plate 29 is fixedly provided on the first support rod 6. An elevating push device capable of moving up and down is provided on the support plate 29. The top of the elevating push device abuts against the bottom of the base 24, and the elevating push device can push the base 24 into the placement groove 703 to be adsorbed and fixed by the second magnet block 704.

[0075] Specifically, as Figure 1 and Figure 7 shown, the elevating push device includes a seesaw 28 hinged to the top of the support plate 29. The seesaw 28 is located on the right side of the first support plate 6. Specifically, the seesaw 28 includes a first horizontal plate section 2801, an inclined plate section 2803, and a second horizontal plate section 2804 connected in sequence from left to right. An ear plate 2802 is fixedly provided at the bottom of the first horizontal plate section 2801. A second support rod 30 with a vertical portal rod structure is fixedly provided on the support plate 29. The ear plate 2802 is rotatably sleeved on the crossbar section of the ear plate 2802. An anti-slip pad 2805 is fixedly provided at the top of the second horizontal plate section 2804.

[0076] A first support plate 23 capable of moving up and down is slidably sleeved on the first support rod 6. The first support plate 23 is movably abutted against the bottom of the base 24 at the lower end of the lifting rod. As Figure 6 shown, a rotatable ball 25 is embedded at the bottom of the base 24.

[0077] A second connecting rod 26 extending downward is fixedly connected to the bottom of the first support plate 23. A second roller 27 is fixedly provided at the bottom of the second connecting rod 26. The bottom of the second roller 27 abuts against the seesaw 28. The second connecting rod 26 is located on the left side of the ear plate 2802. A through hole through which the pumping pipe 35 can pass is provided on the first support plate 23.

[0078] In order to enable the operator to complete the lowering adjustment of all the lifting rods and clean the test plate 7 without moving at a certain position on the test plate 7, as Figure 1 and Figure 2 shown, the test plate 7 includes a central circular plate 701 and a moving ring plate 702 rotatably connected to the outside of the central circular plate 701. The central circular plate 701 is fixedly provided on the top of the first support rod 6. The lifting rod, the T50 marking line, the first magnet block 12, and the slump cone 13 are all located on the moving ring plate 702. The concrete outlet end of the pumping system is located on the central circular plate 701, and the outlet end of the pumping system corresponds to the inner side plate of the slump cone 13 up and down.

[0079] In order to reduce the error caused by the slump cone 13 being skewed when lifting the slump cone 13 by hand, as Figure 1As shown, a second slider 15 capable of sliding up and down is provided on the vertical rod 16. A first connecting rod 14 extending rightward is fixedly connected to the second slider 15. One end of the first connecting rod 14 away from the second slider 15 is fixedly connected to the side of the slump cone 13.

[0080] A lifting device is provided on the vertical rod 16. One end of the lifting device is fixedly connected to the second slider 15. The lifting device is used to pull the second slider 15 upward to lift the slump cone 13. Specifically, the lifting device in this embodiment includes a fixed pulley 18 fixedly provided at the top of the vertical rod 16 and a pulling rope 19 fixedly connected to the top of the second slider 15. A first hanging ring 20 is fixedly provided at one end of the pulling rope 19 away from the second slider 15. A first hanging rod 21 and a second hanging rod 22 are vertically and fixedly provided on the left side of the vertical rod 16 at intervals up and down, and the vertical distance between the first hanging rod 21 and the second hanging rod 22 is greater than the height of the slump cone 13; the pulling rope 19 bypasses the fixed pulley 18, and the first hanging ring 20 can be arbitrarily hung on the first hanging rod 21 or the second hanging rod 22; when the first hanging ring 20 is hung on the first hanging rod 21, the slump cone 13 falls on the test plate 7.

[0081] In order to collect the self-compacting concrete overflowing from the top of the slump cone and scrape the self-compacting concrete at the top of the slump cone, as Figure 1 and Figure 10 shown, a detachable tray 52 is provided at the top of the slump cone 13. The tray 52 includes a chassis and an annular retaining edge 5201 provided on the periphery of the chassis. The top of the annular retaining edge 5201 is higher than the upper surface of the chassis. An overflow hole 5202 penetrating up and down is provided on the chassis. The diameter of the chassis is greater than the diameter of the upper port of the slump cone 13. When the chassis is translated, it can scrape the self-compacting concrete part at the top of the slump cone. A plurality of springs 53 hanging downward naturally are fixedly provided on the outer side of the annular retaining edge 5201. A second hanging ring 54 is fixedly provided at the lower end of the spring 53. A plurality of third hanging rods 55 are fixedly provided on the outer side of the slump cone 13. The second hanging ring 54 can be hung on the third hanging rod 55 after pulling the spring 53 to elongate.

[0082] A pumping system and a power supply box 41 are provided on the support plate 29. The pumping system includes a concrete inlet end and a concrete outlet end. The concrete inlet end is located in the storage tank 4, and the concrete outlet end is embedded in the test plate 7, and the outlet end of the pumping system is located inside the slump cone 13. Specifically, as Figure 1 and Figure 7 shown, the pumping system includes a concrete pump 32 fixedly provided on the support plate 29. The suction port of the concrete pump 32 is connected to one end of a first suction pipe 33. A first solenoid valve 34 is provided on the first suction pipe 33. The other end of the first suction pipe 33 penetrates into the storage tank 4.

[0083] The discharge port of the concrete pump 32 is connected to one end of the pumping pipe 35. The other end of the pumping pipe 35 passes through the test plate 7 and is located inside the slump cone 13. A digital pressure gauge 36, an electric control valve 37, and a check valve 38 are successively arranged on the pumping pipe 35 from bottom to top.

[0084] On the left side of the bottom plate 1, a vertically arranged vertical rod 16 is fixedly provided. On the left side of the vertical rod 16, a handrail 56 and a controller 57 are fixedly provided. The digital pressure gauge 36 is communicatively connected to the controller 57. The controller 57 is electrically connected to the power supply box 41. The controller 57 is control-connected to the first solenoid valve 34, the electric control valve 37, and the concrete pump 32.

[0085] In order to be able to clean the pumping system, the test plate 7, the slump cone 13, and the storage tank 4, as Figure 1 shown, a water tank 5 with an upper opening is formed by enclosing the inner side of the storage tank 4 and the bottom plate 1; the pumping system further includes a second suction pipe 39. One end of the second suction pipe 39 is connected to the first suction pipe 33, and the connection node of the second suction pipe 39 and the first suction pipe 33 is located between the first solenoid valve 34 and the inlet end of the concrete pump 32. A second solenoid valve 40 is provided on the second suction pipe 39. The other end of the second suction pipe 39 is inserted into the water tank 5. The controller 57 is control-connected to the second solenoid valve 40.

[0086] Working principle: When conducting an experiment, first rotate the adjusting leg 3 to lift the first roller 2 off the ground and level the bottom plate 1.

[0087] Then slide the two inserting frames 44 to the left and right sides of the storage tank 4 respectively. Insert the baffle plate 45 into the slot 4401 on the inserting frame 44. Rotate the limiting plate 49 so that the limiting plate 49 presses on the top of the baffle plate 45 to ensure that the baffle plate 45 is in close contact with the inner wall of the storage tank 4, dividing the inner space of the storage tank 4 into two independent spaces by the two baffle plates 45. Fill one of the independent spaces with self-compacting concrete. After standing for 1 minute, rotate the two limiting plates 49 on one of the inserting frames 44 to pull the baffle plate 45 on this inserting frame 44 upward by a certain distance, but still keep the lower end of the baffle plate 45 lower than the upper surface of the self-compacting concrete. Then rotate the two limiting plates 49 and move the two limiting plates 49 to the front and back sides of the baffle plate 45 respectively to clamp and fix the position of the baffle plate 45. After the self-compacting concrete in the storage tank 4 stops flowing, measure the height ratio of the self-compacting concrete in the two independent spaces. If the height ratio H2 / H1 of the self-compacting concrete in the independent space where the concrete flows in later and the independent space where the concrete is initially filled is ≥ 0.8, it indicates that the segregation resistance and fluidity meet the standards. After the test is completed, clean the self-compacting concrete in the storage tank 4.

[0088] Then, reinsert the two baffles 45, place the slump cone 13 at the first magnet block 12 on the test plate 7, place the tray 52 on top of the slump cone 13, and hang the second hanging ring 54 at the lower end of the spring 53 on the third hanging rod 55 on the slump cone 13.

[0089] Then, refill one of the independent spaces in the storage tank 4 with the freshly prepared self-compacting concrete just configured. Start the first solenoid valve 34 and the concrete pump 32 through the controller to start pumping the self-compacting concrete into the slump cone 13. When the self-compacting concrete in the slump cone 13 overflows through the overflow hole 52 into the tray 52, close the first solenoid valve 34 and the concrete pump 32. Clean up the self-compacting concrete that has overflowed in the tray 52, then remove the second hanging ring 54, hold both sides of the tray 52 with both hands, quickly translate it horizontally, and scrape the self-compacting concrete on top of the slump cone 13 flat.

[0090] Then, pull the pull rope 19 to quickly lift the slump cone 13, and then hang the first hanging ring 20 on the second hanging rod 22. When an obstacle appears above the first diffuse reflection photoelectric sensor 58, the controller 57 controls the timer to start timing. When an obstacle appears above the second diffuse reflection photoelectric sensor 9, the controller 57 controls the timer to stop timing, completing the T50 test. If the time required for the center of the self-compacting concrete to collapse to a diameter of 500 mm ≤ 5 seconds, it is qualified. When the self-compacting concrete on the test plate 7 no longer flows, measure the spread diameter of the self-compacting concrete in two directions respectively in a vertical and horizontal manner. If the spread diameter is in the range of 550 - 850 mm, it is qualified.

[0091] Scrape the self-compacting concrete on the test plate 7 into another independent space in the storage tank 4 that has not been filled with self-compacting concrete. Place the slump cone 13 back on the test plate 7, install the tray 52 on top of the slump cone 13, simultaneously lift the first lifting rod 10 and the second lifting rod 11 through the lifting and pushing device, rotate the moving ring plate 702 on the test plate 7, lower the second lifting rod 11 completely, fix the first lifting rod 10 on the test plate 7 through the base 24 and the second magnet block 704. Through the pumping system, refill the slump cone 13 with the unused self-compacting concrete again, and then repeat the above steps to conduct the J-ring experiment. Compare the spread with that without the J-ring, and the difference should ≤ 25 mm.

[0092] Finally, according to the actual steel bar layout density, you can choose to pull out the second lifting rod 11 and the first lifting rod 10 arbitrarily, arrange the orientation and density of the second lifting rod 11 and the first lifting rod 10, and conduct the experiment again to test whether the self-compacting concrete meets the on-site requirements.

[0093] After the test is completed, place the slump cone 13 back on the test plate 7, open the concrete pump 32 and the second solenoid valve 40, and pump clear water upward. The drum controller adjusts the electric control valve 37 to adjust the water pressure and wash the inner wall of the slump cone 13. The water flowing out of the slump cone 13 washes the self-compacting concrete adhering to the surface of the test plate 7. After the washing, the sewage automatically falls into the storage tank 4. After the sewage dilutes the self-compacting concrete overflowing in the storage tank 4, open the sewage discharge valve 51, and the sewage and the self-compacting concrete are discharged from the sewage pipe 50.

[0094] For those skilled in the art, it is obvious that the present invention is not limited to the details of the above exemplary embodiments, and the present invention can be implemented in other specific forms without departing from the spirit or basic characteristics of the present invention. Therefore, from any point of view, the embodiments should be regarded as exemplary and non-restrictive. The scope of the present invention is defined by the appended claims rather than the above description. Therefore, all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be included in the present invention. Any reference signs in the claims should not be regarded as limiting the claims involved.

Claims

1. A self-compacting concrete flow performance testing device, comprising a base plate (1), a plurality of first rollers (2) and height-adjustable legs (3) are provided at the bottom of the base plate (1), and the device is characterized in that: A first vertically arranged support rod (6) is fixedly provided on the top of the bottom plate (1); a storage groove (4) arranged around the first support rod (6) and in an annular shape is fixedly provided on the top of the bottom plate (1); the vertical section of the storage groove (4) is a U-shaped groove structure with an upper opening; two detachable baffles (45) are inserted into the groove of the storage groove (4) and are arranged at intervals; the two baffles (45) can separate the space inside the groove of the storage groove (4) into two independent spaces; a sewage pipe (50) is provided on the outer side of the storage groove (4); and a sewage valve (51) is provided on the sewage pipe (50); A horizontal and coaxially arranged test plate (7) is provided on the top of the first support rod (6); the test plate (7) is a circular plate structure with a diameter of not less than 850 mm; a first magnet block (12) arranged around the first support rod (6) is embedded in the test plate (7); and the outer peripheral surface of the test plate (7) is located directly above the storage tank (4); A slump cone (13) capable of being adsorbed and fixed by a first magnet block (12) is placed on the test plate (7); A plurality of lifting rods arranged in a concentric circle and spaced apart are movably provided on the test plate (7), the upper end surface of the lifting rods is flush with the upper surface of the test plate (7), the lower end surface of the lifting rods is located below the test plate (7), a plurality of second magnet blocks (704) arranged around the lifting rods are provided at the bottom of the test plate (7), a base (24) made of magnetic metal is fixedly provided at the lower end of the lifting rods, and the base (24) corresponds to the second magnet block (704) up and down; A horizontally arranged support plate (29) is fixedly provided on the first support rod (6); a lifting and pushing device capable of being lifted up and down is provided on the support plate (29); the top of the lifting and pushing device abuts against the bottom of the base (24); and the lifting and pushing device can push the base (24) to the second magnet block (704); A pumping system and a power supply box (41) are provided on the support plate (29), the pumping system comprises a concrete inlet end and a concrete outlet end, the concrete inlet end is located in the tank of the storage tank (4), the concrete outlet end is embedded in the test plate (7), and the outlet end of the pumping system is located in the slump cylinder (13); A vertically arranged vertical rod (16) is fixedly provided on the left side of the bottom plate (1), a handrail (56) and a controller (57) are fixedly provided on the left side of the vertical rod (16), the controller (57) is electrically connected to the power supply box (41), and the controller (57) is control-connected to the pumping system.

2. The self-compacting concrete flow performance testing device according to claim 1, characterized in that: The pumping system comprises a concrete pump (32) fixedly mounted on a support plate (29), a suction port of the concrete pump (32) being connected to one end of a first suction pipe (33), a first solenoid valve (34) being arranged on the first suction pipe (33), and the other end of the first suction pipe (33) being inserted into a groove of a storage tank (4); The discharge port of the concrete pump (32) is connected to one end of a pumping pipe (35), the other end of the pumping pipe (35) is passed through the test plate (7) and is located in the slump cylinder (13), and a digital pressure gauge (36), an electric regulating valve (37) and a check valve (38) are sequentially arranged on the pumping pipe (35) from bottom to top; The digital pressure gauge (36) is in communication connection with the controller (57), and the controller (57) is in control connection with the first solenoid valve (34) and the electric regulating valve (37).

3. The self-compacting concrete flow performance testing device according to claim 2, characterized in that: The inner side of the storage tank (4) and the bottom plate (1) are enclosed to form a clean water tank (5) with an upper opening; The pumping system further comprises a second suction pipe (39), one end of which is connected to the first suction pipe (33), and a connection node between the second suction pipe (39) and the first suction pipe (33) is located between the first solenoid valve (34) and the inlet end of the concrete pump (32), a second solenoid valve (40) is provided on the second suction pipe (39), the other end of the second suction pipe (39) is inserted into the clean water tank (5), and a controller (57) is connected to the second solenoid valve (40) for control.

4. The self-compacting concrete flow performance testing device according to claim 1, characterized in that: The upper surface of the test plate (7) is provided with a circular T50 marking line (8) arranged concentrically therewith, the diameter of the T50 marking line (8) is 500 mm, and the lifting rod is located on the inner side of the T50 marking line (8); The test board (7) is embedded with a first diffuse reflection photoelectric sensor (58) located outside the first magnet block (12), and the test board (7) is embedded with four second diffuse reflection photoelectric sensors (9) that are equidistantly spaced along the circumference of the T50 marking line (8); The first diffuse reflection photoelectric sensor (58) and the second diffuse reflection photoelectric sensor (9) are both connected to the controller (57) by signal, and the controller (57) has a built-in timer.

5. The self-compacting concrete flow performance testing device according to claim 1, characterized in that: A second sliding block (15) capable of sliding up and down is provided on the vertical rod (16), a first connecting rod (14) extending to the right is fixedly connected to the second sliding block (15), and one end of the first connecting rod (14) away from the second sliding block (15) is fixedly connected to the side of the slump cone (13); A lifting device is provided on the vertical rod (16), one end of which is fixedly connected to the second sliding block (15). The lifting device is used to pull the second sliding block (15) to move upward to lift the slump cylinder (13).

6. The self-compacting concrete flow performance testing device according to claim 1, characterized in that: A detachable tray (52) is provided on the top of the slump cone (13), the tray (52) comprising a bottom plate and an annular retaining edge (5201) provided on the circumference of the bottom plate, the top of the annular retaining edge (5201) being higher than the upper surface of the bottom plate, an overflow hole (5202) being transparent from top to bottom is provided on the bottom plate, and the diameter of the bottom plate is larger than the diameter of the upper port of the slump cone (13); A plurality of springs (53) that naturally hang downward are fixedly provided on the outer side of the annular retaining edge (5201), a second hanging ring (54) is fixedly provided at the lower end of the spring (53), a plurality of third hanging rods (55) are fixedly provided on the outer side of the slump cylinder (13), and the second hanging ring (54) can be hung on the third hanging rod (55) after the spring (53) is pulled to extend.

7. The self-compacting concrete flow performance testing device according to claim 1, characterized in that: The test plate (7) comprises a central circular plate (701) and a dynamic ring plate (702) rotatably connected to the outer side of the central circular plate (701); the central circular plate (701) is fixedly arranged on the top of the first support rod (6); the lifting rod and the T50 marking line are both located on the dynamic ring plate (702).

8. The self-compacting concrete flow performance testing device according to claim 7, characterized in that: The first magnet block (12) and the slump cone (13) are both located on the moving ring plate (702), the concrete outlet end of the pumping system is located on the central circular plate (701), and the outlet end of the pumping system corresponds to the inner side plate of the slump cone (13) in upper and lower directions.

9. The self-compacting concrete flow performance testing device according to claim 1, characterized in that: The lifting and pushing device comprises a seesaw (28) hingedly arranged on the top of the support plate (29), the hinge point between the seesaw (28) and the support plate (29) is located between the left and right ends of the seesaw (28), and the seesaw (28) is located on the right side of the first support plate (6); A first supporting plate (23) that can move up and down is slidably sleeved on the first supporting rod (6), the first supporting plate (23) movably abuts against the bottom of a base (24) at the lower end of the lifting rod, and a rotatable ball (25) is embedded in the bottom of the base (24); A second connecting rod (26) extending downward is fixedly connected to the bottom of the first supporting plate (23), a second roller (27) is fixedly provided at the bottom of the second connecting rod (26), the bottom of the second roller (27) abuts against the rocker (28), and the second connecting rod (26) is located on the left side of the hinge point between the rocker (28) and the supporting plate (29).

10. The self-compacting concrete flow performance testing device according to claim 1, characterized in that: Two sliding members capable of sliding along the circumference of the storage tank (4) are provided on the inner side of the storage tank (4), and a plug-in frame (44) capable of rotating in a horizontal plane is provided on the top of the sliding member. The plug-in frame (44) can rotate to the top of the slot of the storage tank (4), and a slot (4401) which is transparent from top to bottom is provided on the plug-in frame (44). The baffle (45) can be movably inserted in the slot (4401), and a handle (46) is fixedly provided on the top of the baffle (45); When the baffle (45) is inserted into the slot (4401), the bottom and left and right sides of the baffle (45) are in sliding contact with the bottom and left and right sides of the storage slot (4) respectively; A limiting member capable of rotating in a horizontal plane is provided on the top of the inserting frame (44), and the limiting member can rotate to the top of the baffle (45) to limit the baffle (45) from moving upward.

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