A device for detecting durability of steel slag coarse aggregate concrete

Abstract

The application discloses a kind of steel slag coarse aggregate concrete durability detection devices, belong to corrosion detection technical field, including erosion box, the erosion box inside slidingly connected with cover, the lower side of the cover middle part is fixedly connected with pressing plate, the cover is equipped with through hole, the through hole is slidably connected with plug rod, the weighing mechanism is equipped on the upper end of the plug rod, the lower end of the plug rod is fixedly connected with bearing table, and the bearing table is provided with filter hole;The lower surface of the cover is equipped with laser ultrasonic ware or microwave radar ware, and the height of the lower surface of the laser ultrasonic ware or microwave radar ware is higher than the height of the lower surface of the pressing plate.The application has the advantages of being able to complete multi-index synchronous detection without removing the test block, and has low cost and high continuity, solves the problems of large labor consumption, high cost and poor detection data synchronization in the prior art.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of corrosion detection, and particularly relates to a steel slag coarse aggregate concrete durability detection device. BACKGROUND

[0002] In the field of steel slag coarse aggregate concrete durability detection, the sulfate erosion test is the core means for evaluating the erosion resistance thereof, and the test needs to strictly follow specific test condition control and index detection requirements. According to the detection requirements, the test needs to set 0%, 30%, 60% and 90% in total four steel slag coarse aggregate replacement rates, and 5%, 10% and 15% in total three sodium sulfate solution concentration gradients, and needs to cover the entire erosion process, synchronously monitor three core indexes of the mass change, the compressive strength change and the relative dynamic elastic modulus change of the concrete, and establish a comprehensive evaluation system based on the three indexes to connect a service life prediction model.

[0003] The prior art has obvious technical defects when carrying out the above test: on the one hand, the traditional detection method needs to take out the test block from the erosion box for pressure test and weight test, and then put it back into the erosion box for continuous erosion after the test is completed. This operation not only needs frequent manual intervention and consumes a lot of labor cost, but also may affect the continuity of the test due to the environmental changes (such as temperature fluctuation and solution loss) in the transfer process of the test block, leading to deviation of the detection data from the actual erosion state, and it is difficult to meet the requirement of "synchronous recording of indexes in the entire erosion process"; on the other hand, some schemes try to set pressure and weight detection mechanisms in each erosion box separately, but since the test needs to run multiple replacement rates and concentration gradients (at least 4 replacement rates x 3 concentrations = 12 parallel tests) at the same time, the configuration of independent detection mechanisms in each erosion box will lead to a significant increase in equipment cost, and the complex structure design is prone to failure, which is not conducive to the stable development of the test. In addition, most of the existing devices do not integrate the relative dynamic elastic modulus detection function, and need to be detected separately by additional equipment, which further increases the operation complexity and data synchronization difficulty.

[0004] Therefore, there is an urgent need for a steel slag coarse aggregate concrete durability detection device which can complete multi-index synchronous detection without taking out the test block, and takes into account low cost and high continuity, to solve the problems of high labor cost, high cost and poor detection data synchronization in the prior art. SUMMARY

[0005] In view of the problems in the prior art, the application provides a steel slag coarse aggregate concrete durability detection device, which has the advantages of being able to complete multi-index synchronous detection without taking out the test block, and taking into account low cost and high continuity, and solves the problems of high labor cost, high cost and poor detection data synchronization in the prior art.

[0006] The application is achieved in that a steel slag coarse aggregate concrete durability detection device, which comprises an erosion box, a cover body is slidably connected in the erosion box, a pressing plate is fixedly connected to the lower middle part of the cover body, a through hole is arranged on the cover body, a plug rod is slidably connected in the through hole, a weighing mechanism is arranged on the upper end of the plug rod, a bearing table is fixedly connected to the lower end of the plug rod, and a filter hole is arranged on the bearing table; a laser ultrasonic device or a microwave radar device is arranged on the lower surface of the cover body, and the height of the lower surface of the laser ultrasonic device or the microwave radar device is higher than the height of the lower surface of the pressing plate.

[0007] As preferred in the application, the weighing mechanism comprises a fixed block fixedly connected to the upper end of the plug rod, and a weighing sensor arranged on the lower side of the fixed block; when the cover body is pulled upward, the cover body is first lifted alone, and the bearing table and the test block remain in place due to gravity; until the upper surface of the cover body is attached to the weighing sensor, the cover body is continuously pulled, the weighing sensor is stressed through the cover body, the plug rod, the bearing table and the test block are synchronously lifted, and finally the test block is separated from the solution surface, at this time, the total weight sensed by the weighing sensor minus the self-weight of the bearing table and the plug rod is the current mass of the test block.

[0008] As preferred in the application, a channel is arranged in the plug rod, a connecting pipe is fixedly connected to the upper end of the plug rod, and the connecting pipe is used for connecting a gas pump or a water pump; an inner cavity is arranged in the bearing table and communicates with the filter hole, and the inner cavity communicates with the channel.

[0009] As preferred in the application, an annular air bag is fixedly connected to the edge of the cover body, and the annular air bag is attached to the inner surface of the side wall of the erosion box.

[0010] As preferred in the application, a plurality of through holes are arranged on the side of the plug rod, the through holes communicate with the channel, and the outer side of the through hole is inclined downward.

[0011] As preferred in the application, the lower end of the plug rod is rotatably connected to the bearing table through threads, and the lower end of the plug rod can be attached to the lower surface of the inner cavity.

[0012] As preferred in the application, a rack is further arranged, a hydraulic cylinder is fixedly connected to the rack, and a pressing block is fixedly connected to the telescopic end of the hydraulic cylinder; an electromagnet is arranged on the pressing block, and the lower side of the electromagnet is flush with the lower side of the pressing block.

[0013] As preferred in the application, a base is arranged on the side of the rack, and a rotating disc is rotatably connected to the base; a plurality of erosion boxes are arranged on the rotating disc and are arranged at equal intervals in a ring shape, and the pressing block can be aligned with one of the erosion boxes.

[0014] As preferred in the application, when the annular air bag is in a non-inflated state, a gap is formed between the cover body and the erosion box, and the inside of the erosion box communicates with the outside.

[0015] As a preferred embodiment of the present invention, the erosion chamber is a circular chamber, the cover is a circular cover, the edge of the cover has a groove, and the annular airbag is embedded in the groove.

[0016] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0017] This system integrates an erosion chamber with compressive strength, mass, and dynamic elastic modulus testing functions. Multiple indicators can be tested without removing the test specimen, avoiding interference from temperature fluctuations and solution loss caused by manual handling. This ensures data consistency with the actual erosion state, and the sealed design and solution conditioning function support continuous testing without interruption. Through a "rotary + multi-erosion chamber" design, a single core testing mechanism (hydraulic, weighing, ultrasonic / radar) can support 12 sets of parallel tests. Integrating dynamic elastic modulus testing, airflow drying, and solution conditioning functions reduces reliance on additional equipment. It offers the advantages of simultaneous multi-indicator testing without removing the test specimen, balancing low cost and high continuity, and solving the problems of high manual labor, high cost, and poor data synchronization in existing technologies. Attached Figure Description

[0018] Figure 1 This is a three-dimensional structural diagram from a first perspective of the single erosion chamber in the open state provided in an embodiment of the present invention;

[0019] Figure 2 This is provided by the embodiments of the present invention. Figure 1 A magnified structural diagram of part A in the middle;

[0020] Figure 3 This is a three-dimensional structural diagram of the single erosion chamber in the open state provided in an embodiment of the present invention, from a second perspective.

[0021] Figure 4 This is a top view of the single erosion chamber in the closed state according to an embodiment of the present invention;

[0022] Figure 5 This is provided by the embodiments of the present invention. Figure 4 Schematic diagram of the cross-sectional structure of the middle BB section;

[0023] Figure 6 This is provided by the embodiments of the present invention. Figure 5 A magnified structural diagram of section C;

[0024] Figure 7 This is a three-dimensional structural diagram of the multi-erosion chamber provided in an embodiment of the present invention;

[0025] Figure 8 This is provided by the embodiments of the present invention. Figure 7 A magnified structural diagram of part D in the middle.

[0026] In the diagram: 1. Erosion chamber; 2. Cover; 3. Pressure plate; 4. Through hole; 5. Insert rod; 6. Weighing mechanism; 61. Fixing block; 62. Weighing sensor; 7. Support platform; 8. Filter hole; 9. Laser ultrasonic device; 10. Channel; 11. Connecting pipe; 12. Inner cavity; 13. Annular airbag; 14. Through hole; 15. Frame; 16. Hydraulic cylinder; 17. Pressure block; 18. Electromagnet; 19. Base; 20. Turntable. Detailed Implementation

[0027] To further understand the invention's content, features, and effects, the following embodiments are provided, and detailed descriptions are given in conjunction with the accompanying drawings.

[0028] The structure of the present invention will now be described in detail with reference to the accompanying drawings.

[0029] like Figures 1 to 8 As shown in the figure, an embodiment of the present invention provides a durability testing device for steel slag coarse aggregate concrete, including an erosion chamber 1. A cover 2 is slidably connected inside the erosion chamber 1. A pressure plate 3 is fixedly connected to the lower side of the middle part of the cover 2. A through hole 4 is provided on the cover 2. An insertion rod 5 is slidably connected in the through hole 4. A weighing mechanism 6 is provided at the upper end of the insertion rod 5. A support platform 7 is fixedly connected to the lower end of the insertion rod 5. A filter hole 8 is provided on the support platform 7. A laser ultrasonic device 9 or a microwave radar is provided on the lower surface of the cover 2. The height of the lower surface of the laser ultrasonic device 9 or microwave radar is higher than the height of the lower surface of the pressure plate 3.

[0030] This steel slag coarse aggregate concrete durability testing device integrates the erosion container with an integrated testing structure to achieve in-situ synchronous testing of multiple indicators during the erosion process. The specific working principle is as follows:

[0031] Setting up the corrosion environment: Inject a sodium sulfate solution of a preset concentration (5%, 10%, or 15%) into the corrosion chamber 1. Place concrete test blocks with corresponding steel slag replacement rates (0%, 30%, 60%, or 90%) on the support platform 7. Slide the cover 2 to seal the corrosion chamber, allowing the test blocks to be completely submerged in the solution, thus entering the sulfate corrosion stage. At this time, the support platform 7 is connected to the cover 2 via the insert rod 5, ensuring the test blocks remain in a stable corrosion environment.

[0032] Compressive strength testing: When testing the compressive strength at a specific erosion stage, an external hydraulic device presses down on the cover 2, causing the cover 2 to move the pressure plate 3 downwards synchronously until the pressure plate 3 contacts the surface of the test block and applies pressure. Based on the pressure loading data and the failure state of the test block, combined with concrete strength testing standards, the compressive strength value of the test block at that stage is obtained. Because the lower surface of the laser ultrasonic device 9 or microwave radar is higher than the lower surface of the pressure plate 3, the testing element will not contact the test block during the pressing process, thus avoiding equipment damage.

[0033] Mass change detection: Before or after the compressive strength detection or independently during the detection period, the cover 2 is pulled up by the hydraulic equipment, and the cover 2 drives the bearing table 7 and the test block to separate from the solution surface through the insertion rod 5. The solution remaining on the surface of the test block flows back to the erosion tank 1 through the filter hole 8 of the bearing table 7, reducing the interference of liquid residues on the mass detection. At this time, the weighing mechanism 6 on the cover 2 senses the total mass of the bearing table 7 and the test block through the insertion rod 5, compares the initial mass before erosion, and obtains the mass change data of the test block, i.e., the weight gain or loss.

[0034] Relative dynamic elastic modulus detection: At any stage of the erosion process, the test block can be detected non-contact by the laser ultrasonic device 9 or microwave radar device on the lower surface of the cover 2. The laser ultrasonic device 9 detects by emitting ultrasonic waves and receiving reflected signals, or the microwave radar device detects by electromagnetic waves, analyzes the integrity of the internal structure of the test block, calculates the change of the relative dynamic elastic modulus, and evaluates the internal cracks, structural looseness and other damages in real time, and the detection process does not need to interrupt the erosion environment.

[0035] Data synchronization and continuous erosion: The detection of the above three indicators is completed in situ in the erosion tank, without the need to transfer the test block. After the detection is completed, the cover 2 is reset, and the test block is re-immersed in the solution to continue the erosion, ensuring the continuity of the erosion process. The detection data of each stage is recorded synchronously, meeting the requirement of “synchronization of indicators throughout the erosion process”.

[0036] Further, the weighing mechanism 6 includes a fixed block 61 fixedly connected to the upper end of the insertion rod 5, and a weighing sensor 62 arranged on the lower side of the fixed block 61. The fixed block 61 of the weighing mechanism 6 is fixedly connected to the upper end of the insertion rod 5, and the weighing sensor 62 on the lower side of the fixed block 61 is above the cover 2 (non-contact state). When the hydraulic equipment pulls the cover 2 upward, the cover 2 first rises alone, and the bearing table 7 and the test block remain in place due to gravity (still immersed in the solution); until the upper surface of the cover 2 is attached to the weighing sensor 62, the cover 2 is further pulled, the weighing sensor 62 is stressed through the cover 2, driving the insertion rod 5, the bearing table 7 and the test block to rise synchronously, and finally separating from the solution surface. At this time, the total weight sensed by the weighing sensor 62 minus the self-weight of the bearing table 7 and the insertion rod 5 is the current mass of the test block. Through this setting, the cover 2 is first raised, and the weighing sensor 62 is stressed, so that effective weighing is only performed after the test block is separated from the solution, the interference of buoyancy when the test block is not separated from the liquid surface is excluded, and the mass detection accuracy is improved. Without complex transmission components, the weighing trigger is realized through the sequence of gravity and stress, reducing the risk of mechanical failure and meeting the stability requirements of long-term erosion test.

[0037] Further, the plug rod 5 is provided with a channel 10, the upper end of the plug rod 5 is fixedly connected with a connecting pipe 11 for connecting a gas pump or a water pump; the bearing table 7 is internally provided with an inner cavity 12 in communication with the filter hole 8, and the inner cavity 12 is in communication with the channel 10. The channel 10 in the plug rod 5 is in communication with the inner cavity 12 in the bearing table 7, and the upper end connecting pipe 11 is connected with the gas pump or the water pump. The device has the following functions:

[0038] Air blowing function: start the gas pump before weighing, and the gas enters the inner cavity 12 of the bearing table through the channel 10 and is sprayed out from the filter hole 8, so that the residual solution on the lower surface of the test block is blown off; at the same time, the airflow can clean the residual liquid in the filter hole 8, so as to avoid the influence of the liquid retention on the quality detection.

[0039] Solution delivery function: the water pump is used to inject sodium sulfate solution into the channel 10 (to supplement the erosion liquid) or to pump out the solution (to reduce the liquid level), so that the amount of solution in the erosion tank can be adjusted without opening the cover 2, and the closed nature of the erosion environment is maintained.

[0040] Through the above arrangement, the solution residue on the surface of the test block and the filter hole 8 can be actively removed, the problem of quality detection deviation caused by liquid adhesion can be solved, and the device is especially suitable for the scene where the test block surface is easy to scale after long-term erosion. The solution can be supplemented or pumped out without opening the cover, so that foreign matter is prevented from entering and the solution concentration is prevented from fluctuating, which meets the requirement of continuous monitoring during the entire erosion process. The airflow can accelerate the drying of the test block surface, shorten the waiting time before weighing, and improve the detection efficiency.

[0041] Further, the edge of the cover 2 is fixedly connected with an annular air bag 13, and the annular air bag 13 is attached to the inner surface of the side wall of the erosion tank 1. The annular air bag 13 is fixed to the edge of the cover 2 and is attached to the inner surface of the side wall of the erosion tank 1, and the inflation state is controlled by inflation / deflation.

[0042] Sealing function: when inflated, the annular air bag 13 tightly attaches to the side wall to seal the erosion tank 1, prevent the solution from evaporating or foreign matter from entering, and stabilize the solution concentration.

[0043] Solution extrusion function: the air bag is kept inflated during pressure testing, and the solution in the tank is extruded during the lowering of the cover 2, and the solution is temporarily stored through the channel 10 to avoid the interference of the solution on the test block under pressure.

[0044] Liquid level adjustment function: in the sealed state, the space volume in the tank is changed by lifting and lowering the cover 2 to adjust the liquid level of the solution (such as 60% and 80% submerging the test block), so as to simulate the erosion scene of “partial immersion” (such as the underground water level fluctuation environment). Specifically, the solution in the tank is extruded during the lowering of the cover 2, and the solution is temporarily stored through the channel 10.

[0045] By adjusting the airbag state and the cover height, both severe erosion of full immersion and complex erosion of partial immersion can be simulated, expanding the environmental applicability of the test. The extrusion solution can eliminate the influence of "liquid buffer" on the compression strength test of the test block, making the pressure loading more in line with the concrete strength test standard (rigid contact without liquid interference). The parameters such as solution concentration and temperature are more stable in the sealed state, and the non-sealed state can be used for special erosion scenarios that require air permeability (such as the dry-wet cycle preparation stage), flexibly adapting to the test requirements.

[0046] Further, the side of the insertion rod 5 is provided with a plurality of through holes 14, which are communicated with the channel 10, and the outer side of the through hole 14 is inclined downward.

[0047] The inclined through hole 14 of the side of the insertion rod 5 is communicated with the internal channel 10, and the through hole 14 is directed towards the upper surface and the side of the test block. Through this setting, the following functions are achieved:

[0048] All-round air blowing drying: air supply by air pump before weighing, air flow is sprayed out from the filter hole 8 (below the test block) and the through hole 14 (above and on the side of the test block) at the same time, forming a three-dimensional air flow to clean the solution residues on each surface of the test block (such as side scaling and upper surface water accumulation). Solving the limitation of single filter hole 8 which can only clean the lower part of the test block, the solution (especially the attached liquid of erosion products) on the upper surface and the side of the test block is cleaned more thoroughly, further improving the weighing accuracy.

[0049] Spray circulation function: through the two channels 10 (one for liquid injection and one for liquid extraction), the solution is sprayed out from the through hole 14 to form a spray (simulating sulfate erosion under rainwater scouring), while the waste liquid is recycled by the extraction channel 10, realizing solution circulation and simulating dynamic erosion environment. Through spray circulation, the "flowing sulfate solution" environment (such as river and underground water flow scenarios) is simulated, making up for the shortcomings of static immersion test, and making the test results more in line with the actual engineering environment.

[0050] Further, the lower end of the insertion rod 5 is connected to the bearing table 7 by screw rotation, and the lower end of the insertion rod 5 can be attached to the lower surface of the inner cavity 12.

[0051] When the insertion rod 5 is rotated, the inclination angle of the side through hole 14 changes synchronously, which can direct the air or spray to different areas of the test block (such as corners and center), adapting to the size difference of the test block. By adjusting the spray direction and intensity, the detection needs of test blocks of different sizes and shapes such as prismatic and cubic test blocks are met, enhancing the universality of the device.

[0052] When the lower end of the insertion rod 5 is rotated to attach to the lower surface of the inner cavity 12 of the bearing table, the lower end of the channel 10 is blocked, and the air flow or solution is only sprayed out from the side through hole 14, the pressure is concentrated in the through hole 14, improving the intensity and speed of the spray / air blowing.

[0053] The concentrated airflow / liquid flow can quickly remove stubborn residual liquid (such as crystalline substances generated by erosion), or enhance the scouring effect of the solution on the surface of the test block in the dynamic erosion test, thereby shortening the preparation time of the test.

[0054] Further, the rack 15 is provided with a hydraulic cylinder 16 fixedly connected thereto, and a pressing block 17 fixedly connected to the telescopic end of the hydraulic cylinder 16; the pressing block 17 is provided with an electromagnet 18, and the lower side of the electromagnet 18 is flush with the lower side of the pressing block 17.

[0055] Through the above arrangement, the hydraulic cylinder 16 drives the pressing block 17 to descend, and the pressing block 17 directly presses the cover body 2, and the test block is subjected to pressure by the pressing plate 3, and the pressure value at the time of failure is recorded to calculate the compressive strength. After the detection is completed, the electromagnet 18 is energized to adsorb the cover body 2, the hydraulic cylinder 16 is retracted to drive the pressing block 17, the electromagnet 18 and the cover body 2 to ascend synchronously, and the subsequent weighing process is triggered (such as driving the test block to separate from the solution). In summary, the same set of hydraulic equipment is used to complete the power driving of the pressure test and the weighing, without the need for additional driving components, thereby simplifying the equipment structure and reducing the cost. The electromagnet 18 adsorbs the cover body 2 to avoid the cover body 2 from falling during the ascending process, thereby ensuring the continuity of the weighing immediately after the pressure test, and reducing the influence of the time interval between different processes on the data synchronization.

[0056] Further, the side of the rack 15 is provided with a base 19, and the base 19 is rotatably connected with a turntable 20; the erosion tank 1 is provided with a plurality of erosion tanks 1 arranged in a ring shape at equal intervals on the turntable 20, and the pressing block 17 can be aligned with one of the erosion tanks 1.

[0057] The turntable 20 on the side base 19 of the rack 15 is arranged with a plurality of erosion tanks 1 in a ring shape at equal intervals, and each erosion tank corresponds to a different steel slag replacement rate (such as 0%, 30%, 60%, 90%) or a different sodium sulfate concentration (5%, 10%, 15%). During the test, the target erosion tank 1 is transferred to the position directly below the pressing block 17 by rotating the turntable 20, and the compressive strength detection, weighing and other operations of the test block are completed; the other erosion tanks 1 continue to perform the erosion reaction during the waiting process. In summary, a plurality of replacement rates and concentrations can be simultaneously tested in parallel (such as 12 groups), which meets the core requirement of comparing the influence of different replacement rates and concentrations, and avoids the accidental error of single test. The rotation of the turntable 20 realizes the rotation detection of the plurality of test blocks, without the need for configuring independent detection mechanisms for each test block, thereby greatly reducing the total cost of the equipment, and the detection efficiency is higher.

[0058] Specifically, the following control can be performed:

[0059] Detection triggering: preset time node (such as 7 days, 14 days of erosion), the first group of erosion tanks is moved to the position directly below the pressing block 17 by rotating the turntable 20;

[0060] Pressure test: the hydraulic cylinder 16 drives the pressing block 17 to press the cover 2 to complete the compression strength detection;

[0061] Weighing linkage: the electromagnet 18 adsorbs the cover 2, the hydraulic cylinder 16 rises to drive the test block to separate from the solution, and the weighing sensor 62 synchronously obtains mass data;

[0062] Cyclic detection: after completion, the turntable 20 rotates to move the next group of erosion tanks to the detection position, and the above process is repeated, and all data are automatically recorded to the system.

[0063] Further, when the annular air bag 13 is in a non-inflated state, a gap is formed between the cover 2 and the erosion tank 1, and the inside of the erosion tank 1 is in communication with the outside.

[0064] When the annular air bag 13 is deflated (non-inflated state), there is a gap (not sealed) between the cover 2 and the erosion tank 1. The solution is injected into the erosion tank (partly or completely immersed in the test block), at this time, the pressure test is carried out, which can simulate the underwater stress scenario (such as the stress state of underwater building concrete), and detect the performance under the coupling action of erosion and stress. The constant load applied to the test block is maintained by the pressing plate, while the solution is injected, and the water absorption speed and mass change of the test block under the stress state are monitored, and the damage law of force-water coupling in the erosion environment is evaluated. In summary, the limitations of traditional non-load erosion or dry state stress can be broken through, the complex working conditions of concrete under stress and erosion in actual engineering can be simulated, and the detection result is closer to the real service environment. Supplementary data such as water absorption capacity under stress state are provided, more comprehensive input parameters are provided for comprehensive durability evaluation index, and the scientificity of the evaluation system is improved.

[0065] Specifically, the erosion tank 1 is a circular tank body, the cover 2 is a circular cover body, the edge of the cover 2 has a groove, and the annular air bag 13 is embedded in the groove.

[0066] The working principle of the present application is as follows:

[0067] The inflation / non-inflation state of the annular air bag 13 cooperates with the blowing / spraying function of the plug rod channel 10 and the directional injection of the through hole 14 to cover the whole process scenario from erosion to detection.

[0068] Dynamic erosion stage: the annular air bag 13 is inflated (sealed), the plug rod channel 10 passes the solution, and the through hole 14 sprays to realize the oblique injection of the solution to the surface of the test block through the through hole 14, while the annular air bag 13 is sealed to avoid overflow of the solution, simulating the flowing sulfate environment (such as groundwater scouring), and multiple concentration gradients can be switched through the turntable 20;

[0069] The stress detection stage: the annular air bag 13 is inflated (sealed) and the channel 10 is extracted solution, which can realize the cover body to drop and extrude the solution into the channel 10 for temporary storage, and the test block is pressed in the state of no liquid buffer, and the dry stress performance is detected; if the annular air bag 13 is not inflated and the channel 10 is injected with solution, the test block can be pressed in the solution immersion, and the wet stress performance is detected.

[0070] The weighing preparation stage: the annular air bag 13 is inflated (to prevent external airflow interference), the channel 10 is ventilated, and the through hole 14 is blown, which can realize the airflow to be sprayed from the through hole 14 (the upper / side surface of the test block) and the filter hole (the lower surface of the test block) in three dimensions, quickly dry the residual solution, and seal the environment to avoid the external water vapor from entering to affect the weighing.

[0071] The single structure can only realize static immersion or single-direction blowing, and after the linkage of the three: both static immersion, flow scouring and other erosion environments can be simulated, and dry / wet stress scenes can be switched in the same device, the problem of single scene of traditional equipment and the need for multiple equipment switching is solved. The combination of three-dimensional blowing and sealed environment improves the dry efficiency of the test block and reduces the weighing error.

[0072] It should be noted that, in the present text, relational terms such as first and second are used merely to distinguish one entity or action from another, without necessarily requiring or implying any such actual relationship or order between such entities or actions. Moreover, the terms "comprising", "including" or any other variant thereof are intended to cover non-exclusive inclusion, so that a process, method, article or apparatus including a series of elements includes not only those elements, but also other elements not explicitly listed or inherent to such a process, method, article or apparatus.

[0073] Although the embodiments of the present application have been shown and described, it will be understood by those of ordinary skill in the art that various changes, modifications, replacements and variations of the embodiments can be made without departing from the principles and spirits of the present application, and the scope of the present application is defined by the appended claims and their equivalents.

Claims

1. A device for detecting durability of steel slag coarse aggregate concrete, characterized by, The utility model relates to an erosion box (1) inside slidingly connected with a cover (2), the lower middle part of cover (2) is fixedly connected with the pressing plate (3), cover (2) is equipped with the through -hole (4), the through -hole (4) is slidably connected with the plug rod (5), the upper end of plug rod (5) is equipped with the weighing mechanism (6), the lower end of plug rod (5) is fixedly connected with the bearing platform (7), and the steel slag coarse aggregate concrete test block is placed on the bearing platform (7), and the bearing platform (7) is opened with filter hole (8). The lower surface of the cover (2) is provided with a laser ultrasonic device (9) or a microwave radar device, and the height of the lower surface of the laser ultrasonic device (9) or the microwave radar device is higher than the height of the lower surface of the pressing plate (3). The weighing mechanism (6) includes a fixed block (61) fixedly connected to the upper end of the plug rod (5), and a weighing sensor (62) provided on the lower side of the fixed block (61). When the cover (2) is pulled upward, the cover (2) first rises alone, and the bearing platform (7) and the test block remain in place due to gravity. Until the upper surface of the cover (2) is attached to the weighing sensor (62), continue to pull the cover (2), the weighing sensor (62) is stressed through the cover (2), driving the plug rod (5), the bearing platform (7) and the test block to rise synchronously, and finally the test block is separated from the solution surface. At this time, the total weight sensed by the weighing sensor (62) minus the self-weight of the bearing platform (7) and the plug rod (5) is the current mass of the test block. The plug rod (5) is provided with a channel (10), and the upper end of the plug rod (5) is fixedly connected with a connecting pipe (11) for connecting a gas pump or a water pump. The bearing platform (7) is provided with an inner cavity (12) in communication with the filter hole (8), and the inner cavity (12) is in communication with the channel (10). The side of the plug rod (5) is provided with a plurality of through holes (14) in communication with the channel (10), and the outer side of the through hole (14) is inclined downward, and the through hole (14) faces the upper surface and the side of the test block. The lower end of the plug rod (5) is rotatably connected to the bearing platform (7) by a thread, and the lower end of the plug rod (5) can be attached to the lower surface of the inner cavity (12). The edge of the cover (2) is fixedly connected with an annular air bag (13), and the annular air bag (13) is attached to the inner surface of the side wall of the erosion box (1).

2. The device for detecting the durability of steel slag coarse aggregate concrete according to claim 1, characterized in that: Further comprising a rack (15) fixedly connected with a hydraulic cylinder (16), and a pressing block (17) fixedly connected to the extension end of the hydraulic cylinder (16). The lower side of the electromagnet (18) is flush with the lower side of the pressing block (17).

3. The device for detecting the durability of steel slag coarse aggregate concrete according to claim 2, characterized in that: The side of the rack (15) is provided with a base (19), and a rotating disc (20) is rotatably connected to the base (19). The erosion box (1) is provided with a plurality of erosion boxes (1) arranged equidistantly on the rotating disc (20) in a ring shape, and the pressing block (17) can be aligned with one of the erosion boxes (1).

4. The device for detecting the durability of steel slag coarse aggregate concrete according to claim 3, characterized in that: ​ 5. The device for detecting the durability of steel slag coarse aggregate concrete according to claim 4, characterized in that: When the annular air bag (13) is in a non-inflated state, a gap is formed between the cover (2) and the erosion box (1), and the inside of the erosion box (1) is communicated with the outside.

6. The device for detecting the durability of a steel slag coarse aggregate concrete according to claim 5, characterized in that: The erosion box (1) is a circular box body, the cover (2) is a circular cover body, the edge of the cover (2) has a groove, and the annular air bag (13) is inlaid in the groove.

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