A device for detecting the anti-cracking performance in concrete production

Abstract

The application discloses a kind of anti-cracking performance detection devices in concrete production, it is related to the field of concrete including: frame body;Chassis is fixed in the bottom of frame body;Shell is arranged as four groups, mutually perpendicular fixed on the upper end surface of chassis, and on the frame body is attached;Mold assembly is installed in the inside of shell;Control center is fixed in the side surface of frame body and shell, and inside is placed with power supply, circuit board, motor, for data processing and control other components;Auxiliary components are fixed on the upper end surface of frame body, and inside is fixed with fan, for assisting drying concrete in experimental process;And measurement assembly, one end is fixed with auxiliary components, and the other end is located above mold assembly.

Description

Technical Field

[0001] This invention relates to the field of concrete, and more specifically to a device for testing the crack resistance of concrete during production. Background Technology

[0002] Cracks are an important factor affecting the durability of concrete structures. When the number and size of cracks reach a certain level, reinforced concrete components will gradually deteriorate due to the intrusion of corrosive media in the environment. The factors affecting concrete cracking are very complex. Among them, cracks caused by concrete shrinkage deformation account for about 80% of the total cracks. Based on the research on the causes and mechanisms of concrete cracking, it is necessary to conduct quantitative analysis of the crack resistance performance of concrete.

[0003] Existing methods based on the ICBO (International Conference of Building Officials) method involve inducing cracks through a single-groove slit, effectively avoiding the randomness of concrete crack location and promoting the appearance of cracks at relatively fixed locations with larger widths and faster speeds. The resulting cracks are easy to measure and subsequently quantitatively analyze. However, inducing cracks through only a single groove only characterizes the crack resistance of the concrete at the slit. Considering the uneven distribution of aggregates in concrete, the cracks induced by a single groove are influenced by many factors, resulting in limited representativeness of the measurements. Furthermore, the maximum width and length of the cracks need to be determined during the entire measurement process, and it is difficult to avoid the influence of human error in determining and measuring the location of the maximum crack.

[0004] Therefore, it is necessary to provide a device for testing the crack resistance of concrete in production to solve the problems mentioned in the background art. Summary of the Invention

[0005] To achieve the above objectives, the present invention provides the following technical solution: a device for testing the crack resistance of concrete during production, comprising:

[0006] Frame;

[0007] The chassis is fixed to the bottom of the frame.

[0008] The outer shell is arranged in four groups, which are fixed perpendicularly to each other on the upper surface of the chassis and fit against the frame.

[0009] The mold assembly is installed inside the housing;

[0010] The control center is fixed to the side of the frame and the outer shell, and contains a power supply, circuit board, and motor for data processing and controlling other components.

[0011] An auxiliary component, fixed to the upper surface of the frame, and containing an internal fan, is used to assist in drying the concrete during the experiment; and

[0012] The measuring component is fixed at one end to the auxiliary component and at the other end above the mold component.

[0013] Furthermore, preferably, the mold assembly includes:

[0014] The vibrating rods are arranged in multiple groups corresponding to the outer shell and fixed on the outer shell, and one group is connected to the control center to control the vibration.

[0015] The fastening shell is arc-shaped and consists of multiple parts, which are fixed to the ends of the vibration rod.

[0016] The mold shell is coaxially fitted into the fastening shell;

[0017] The induction component is located inside the mold shell;

[0018] The measuring component, with one end fixed inside the mold shell and the other end connected to the control center, contains a temperature measuring element; and

[0019] The fixing components are arranged in multiple groups, evenly distributed around the circumference of the inner wall of the mold shell near the bottom.

[0020] Furthermore, as a preferred embodiment, the mold shell has an inner radius of 800mm, a height of 100mm, and a wall thickness of 3mm.

[0021] Furthermore, preferably, the induction component includes:

[0022] A fixed plate is fixed to the upper end face of the chassis, and its upper end face is connected to the lower end face of the mold shell;

[0023] Curved grooves are formed inside the upper end face of the fixing plate to assist in fixing the concrete;

[0024] The separator rod is vertically fixed at the center of the fixed plate; and

[0025] The guide strips are arranged in multiple groups evenly distributed around the circumference and positioned above the fixed plate.

[0026] Furthermore, as a preferred embodiment, the guide strips are arranged vertically with a narrower top and a wider bottom. Each guide strip is 5mm wide at the top, 50mm wide at the bottom, and 40mm high. All guide strips are fixedly connected to each other at one end and attached to the separator rod, while the other end is attached to the inner wall of the mold shell.

[0027] Furthermore, preferably, the fixing component includes:

[0028] A mounting slot is provided on the fixed plate;

[0029] The locking strip is fixed to the inner wall of the mold shell corresponding to the mounting groove; and

[0030] The extrusion plate is connected to the locking strip at one end and exposed at the other end.

[0031] Furthermore, preferably, the measuring component includes:

[0032] The main rod is fixedly connected at one end to the auxiliary component;

[0033] The connector is fixed to the other end of the main rod, and a cable is connected between it and the control center. A drive component is placed inside the connector.

[0034] The head is rotated and mounted on the lower end of the connector;

[0035] The receiver is fixed to the side of the rotating head; and

[0036] A marker is fixed to the lower end face of the rotating head, and a main laser component and a secondary laser component are slidably disposed on the lower end face of the marker.

[0037] Furthermore, as a preferred embodiment, a drive component is provided inside the marker to control the sliding of the main laser element and the auxiliary laser element. Starting from the rotating head, a separation boundary is set on the marker with a scale of 100mm. The irradiation range of the main laser element is a strip area with a length of 100mm and a width of 1mm, and the irradiation range of the auxiliary laser element is a spot area with a diameter of 1mm.

[0038] Compared with the prior art, the present invention provides a device for testing the crack resistance of concrete in production, which has the following beneficial effects:

[0039] 1. In this invention, multiple guide strips are arranged circumferentially to cover multiple directions of the concrete, which avoids the uneven distribution of aggregate in the concrete and thus the experimental results are less representative. At the same time, multiple sets of cracks are provided to make the experimental data more abundant.

[0040] 2. In this invention, the main laser element and the auxiliary laser element work together to scan along a circular trajectory with the separator rod as the center. With the corresponding process, the distance measurement principle is used to detect the crack appearance time, crack length, and crack width, which effectively reduces the difficulty of determining the crack width location and measuring the crack width. At the same time, the detection process can be adjusted for different materials to effectively improve the accuracy of the data. Attached Figure Description

[0041] Other features, objects, and advantages of the present invention will become more apparent from the following detailed description of non-limiting embodiments with reference to the accompanying drawings:

[0042] Figure 1 A schematic diagram of the overall structure of a crack resistance testing device for concrete production.

[0043] Figure 2 A schematic diagram of a mold assembly structure for a crack resistance testing device in concrete production;

[0044] Figure 3 A schematic diagram of the induction component structure of a crack resistance testing device in concrete production;

[0045] Figure 4 This is a schematic diagram of the measuring component structure of a crack resistance testing device for concrete production.

[0046] Figure 5 This is a schematic diagram of the working process of a crack resistance testing device in concrete production.

[0047] In the diagram: 1. Frame; 2. Chassis; 3. Shell; 4. Mold assembly; 41. Vibration rod; 42. Fastening shell; 43. Mold shell; 44. Induction assembly; 441. Fixing plate; 442. Curved groove; 443. Separator rod; 444. Induction strip; 45. Measuring component; 46. Fixing assembly; 461. Placement groove; 462. Locking strip; 463. Extrusion plate; 5. Control center; 6. Auxiliary components; 7. Measuring assembly; 71. Main rod; 72. Connector; 73. Cable; 74. Rotary head; 75. Receiver; 76. Marker; 77. Main laser component; 78. Secondary laser component. Detailed Implementation

[0048] Please see Figure 1-5 In this embodiment of the invention, a device for testing the crack resistance of concrete during production includes:

[0049] Frame 1;

[0050] The chassis 2 is fixed to the bottom of the frame 2;

[0051] The outer shell 3 is arranged in four groups, which are fixed perpendicularly to each other on the upper surface of the chassis 2 and are attached to the frame 1;

[0052] Mold assembly 4 is installed inside the outer casing 3;

[0053] The control center 5 is fixed to the side of the frame 1 and the outer shell 3, and contains a power supply, circuit board, and motor for data processing and controlling other components.

[0054] Auxiliary component 6, fixed to the upper end face of the frame 1, and equipped with a fan inside, is used to assist in drying the concrete during the experiment; and

[0055] The measuring component 7 is fixed at one end to the auxiliary component 6, and the other end is located above the mold component 4.

[0056] In this embodiment, as Figure 2 The mold assembly 4 includes:

[0057] Vibration rods 41 are arranged in multiple groups corresponding to the outer shell 3 and fixed on the outer shell 3, and one group is connected to the control center 5 to control the vibration.

[0058] The fastening shell 42 is arc-shaped and is arranged in multiple parts, corresponding to the end of the vibration rod 41;

[0059] The mold shell 43 is coaxially sleeved in the fastening shell 42;

[0060] The induction component 44 is disposed inside the mold shell 43;

[0061] Measuring component 45, one end fixed inside the mold shell 43, the other end connected to the control center 5, contains a temperature measuring component; and

[0062] The fixing components 46 are arranged in multiple groups and are evenly distributed around the circumference of the inner wall of the mold shell 43 near the bottom.

[0063] In a preferred embodiment, the mold shell 43 has an internal radius of 800 mm, a height of 100 mm, and a wall thickness of 3 mm.

[0064] It should be explained that the entire experiment requires the preparation of the specimen first. Specifically, the mixed concrete is poured into the mold shell 43, and then the vibration rod 41 is driven by the control center 5 to vibrate. The vibration is transmitted through the mold shell 43 to make the concrete filling more uniform and sufficient. During this process, care must be taken to control the vibration of the specimen to avoid over-vibration and under-vibration. After that, the upper surface of the concrete is flattened to complete the specimen preparation. Then the experiment begins. After the concrete is left to stand for 30 minutes, the auxiliary component 6 is controlled by the control center 5 to blow air parallel to the surface of the specimen, with the wind speed controlled at (5±0.5) m / s. At the same time, the ambient temperature needs to be controlled at (20±2)℃ and the relative humidity at (60±5)%. During this process, the temperature of the specimen is checked by the measuring component 45, and the cracks are tested by the measuring component 7.

[0065] In this embodiment, as Figure 3 The induction component 44 includes:

[0066] The fixed plate 441 is fixed to the upper end face of the base plate 1, and its upper end face is connected to the lower end face of the mold shell 43;

[0067] Curved groove 442 is formed inside the upper end face of the fixed plate 441 to assist in fixing the concrete;

[0068] The separator 443 is vertically fixed at the center of the fixed plate 441; and

[0069] The guide strips 444 are arranged in multiple groups evenly distributed around the circumference and are positioned above the fixed plate 441.

[0070] It should be explained that the fixed plate 441 and the mold shell 43 together form a cavity for placing concrete. When the concrete solidifies, it interlocks with the curved groove 442 to increase the degree of adhesion.

[0071] In a preferred embodiment, the guide strips 444 are arranged vertically with a narrower top and a wider bottom. Each guide strip 444 has a width of 5mm at the top, a width of 50mm at the bottom, and a height of 40mm. All guide strips 444 are fixedly connected to each other at one end and adhere to the separator rod 443, while the other end adheres to the inner wall of the mold shell 43.

[0072] It needs to be explained that, based on the time required for concrete to solidify during the concrete crack resistance testing process, the entire experiment takes a relatively long time. Furthermore, the experimental requirements necessitate multiple sets of data to avoid the randomness of the results. The existing ICBO method uses a single built-in stress induction generator to promote concrete cracking while controlling the cracking direction, improving the cracking sensitivity and effectiveness of concrete materials, providing scientific crack evaluation indicators, and quantitatively comparing the cracking performance of concrete materials. However, using only a single-groove scissor-induced crack only characterizes the crack resistance of the concrete at the scissor-edge. Considering the uneven distribution of aggregate in concrete, the cracks induced by a single-groove scissor-induced crack are influenced by many factors, resulting in less representative experimental results and fewer experimental data. This device uses multiple circumferentially arranged induction strips to cover multiple directions of the concrete, reducing the deviation caused by concrete unevenness. It can also promote concrete cracking and control the cracking direction, while providing multiple sets of cracks to enrich the experimental data.

[0073] In this embodiment, as Figure 3 The fixing component 46 includes:

[0074] A mounting slot 461 is provided on the fixing plate 441;

[0075] Locking strip 462 is fixed to the inner wall of mold shell 43 corresponding to the mounting groove 461; and

[0076] The extrusion plate 463 is connected to the locking strip 462 at one end and exposed at the other end.

[0077] It should be explained that during the specimen preparation process, before filling with concrete, a polyethylene film needs to be placed inside the mold shell 43 as an isolation layer. At the corresponding placement groove 461, the extrusion plate 463 provides a locking force through the locking strip 462 to fix the polyethylene film and prevent the polyethylene film from shifting and affecting the concrete filling.

[0078] In this embodiment, as Figure 4 The measuring component 7 includes:

[0079] The main rod 71 is fixedly connected at one end to the auxiliary component 6;

[0080] The connector 72 is fixed to the other end of the main rod 71, and a cable 73 is connected between it and the control center 5. A drive component is placed inside the connector 72.

[0081] Rotary head 74 is rotatably mounted on the lower end of the connector 72;

[0082] Receiver 75 is fixed to the side of the rotating head 74; and

[0083] A marker 76 is fixed to the lower end face of the rotating head 74, and a main laser component 77 and a secondary laser component 78 are slidably disposed on the lower end face of the marker 76.

[0084] In a preferred embodiment, a drive component is provided inside the pointer 76 to control the sliding of the main laser element 77 and the auxiliary laser element 78. The pointer 76 is divided into 100mm increments starting from the rotating head 74. The main laser element 77 has an irradiation range of 100mm long and 1mm wide strip area, and the auxiliary laser element 78 has an irradiation range of 1mm diameter spot area.

[0085] It needs to be explained that during crack testing, measuring crack width presents challenges. Firstly, it's difficult to pinpoint the location of the maximum crack width. Secondly, width measurement requires a 40x microscope to collect data for each crack, making the entire process complex, time-consuming, and difficult to guarantee accuracy. Figure 5Taking C50 concrete as an example, this device starts timing from the moment water is added during concrete mixing. Because cracks do not occur during the initial setting process of concrete, and cracks first appear near the separator rod 443 where the inducing strips 444 converge, the main laser element 77 and the auxiliary laser element 78 are controlled to slide within the 0mm-100mm range on the marker rod 76. After 20 minutes, the rotating head 74 is controlled to rotate in 3-minute cycles. During this process, the main laser element 77 performs a full scan around the separator rod 443 along a circular trajectory. The receiver 75 receives signals to determine if cracks have appeared. This process continues until the appearance time of each crack is recorded; this is stage one. Afterward, the main laser element 77 and the auxiliary laser element 78 are controlled to slide progressively within the 100mm-800mm range on the marker rod 76. At each scale level, the main laser element 78 performs a full scan along a circular trajectory to determine the location of crack extension and to determine and record the final position of the crack. Set the corresponding scale area, then adjust the scanning cycle to 10 minutes, and repeat the above process starting from the lowest scale position determined last time, re-recording the crack position until the crack is completely through. This process is stage two. After that, up to 24 hours, the main laser component 77 performs three scans to determine the scale range corresponding to the maximum width of each crack. Then, within this range, the secondary laser component 78 measures the width of the crack step by step in 10mm increments, and records the maximum value. This process is stage three. In the case of crack interruption, control the main laser component 77 and the secondary laser component 78 to slide step by step on the marker 76 within a range of 100mm-800mm, and record the crack length value. This process is stage four. Finally, summarize and process the measurement information to complete the detection. The whole process completes the automatic detection of crack length and width, effectively reducing the difficulty of determining the crack width position and measuring the width. At the same time, adjusting the detection process for different materials effectively improves the accuracy of the data.

[0086] In specific implementation, a polyethylene film is placed inside the mold shell 43. Then, at the corresponding placement groove 461, the extrusion plate 463 provides a locking force through the locking strip 462 to fix the polyethylene film. The mixed concrete is poured into the mold shell 43. The vibration rod 41 is driven to vibrate through the control center 5. The vibration is transmitted through the mold shell 43 to make the concrete filling more uniform and sufficient. Then, the upper surface of the concrete is flattened to complete the specimen preparation. Then, the experimental process begins. After the concrete is left to stand for 30 minutes, the auxiliary component 6 is controlled by the control center 5 to blow air parallel to the surface of the specimen. The measurement component 7 measures the crack appearance time, crack length, and crack width.

[0087] The above description is merely a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A device for testing the crack resistance of concrete during production, characterized in that: include: Frame (1); The chassis (2) is fixed to the bottom of the frame (1); The outer shell (3) is arranged in four groups, which are fixed perpendicularly to each other on the upper surface of the chassis (2) and are attached to the frame (1); Mold assembly (4) is installed inside the housing (3); The control center (5) is fixed to the side of the frame (1) and the outer shell (3), and contains a power supply, circuit board, and motor for data processing and control of other components. The auxiliary component (6) is fixed to the upper end face of the frame (1) and has a fan fixed inside it, which is used to help dry the concrete during the experiment. as well as The measuring component (7) is fixed at one end to the auxiliary component (6) and at the other end above the mold assembly (4); The mold assembly (4) includes: The vibration rods (41) are arranged in multiple groups corresponding to the outer shell (3), and are fixed on the outer shell (3), and one group is connected to the control center (5) to control the vibration; The fastening shell (42) is arc-shaped and is arranged in multiple parts, corresponding to the end of the vibrating rod (41); The mold shell (43) is coaxially sleeved in the fastening shell (42); The induction component (44) is disposed inside the mold shell (43); The measuring component (45) has one end fixed inside the mold shell (43) and the other end connected to the control center (5), and its interior contains a temperature measuring component; and The fixing components (46) are arranged in multiple groups and are evenly distributed around the circumference of the inner wall of the mold shell (43) near the bottom end; The induction component (44) includes: A fixed plate (441) is fixed to the upper end face of the base plate (2), and its upper end face is connected to the lower end face of the mold shell (43); A curved groove (442) is formed inside the upper end face of the fixed plate (441) to assist in fixing the concrete; The separator rod (443) is vertically fixed at the center of the fixed plate (441); The guide strips (444) are evenly distributed in multiple groups around the circumference and are set above the fixed plate (441).

2. The device for testing the crack resistance of concrete in production according to claim 1, characterized in that: The mold shell (43) has an internal radius of 800 mm, a height of 100 mm, and a wall thickness of 3 mm.

3. The device for testing the crack resistance of concrete in production according to claim 1, characterized in that: The guide strips (444) are arranged vertically with a narrow top and a wide bottom. Each guide strip (444) is 5mm wide at the top, 50mm wide at the bottom, and 40mm high. All the guide strips (444) are fixedly connected to each other at one end and attached to the separator rod (443), and the other end is attached to the inner wall of the mold shell (43).

4. The device for testing the crack resistance of concrete in production according to claim 1, characterized in that: The fixing component (46) includes: A mounting slot (461) is provided on the fixed plate (441); The locking strip (462) is fixed to the inner wall of the mold shell (43) corresponding to the mounting groove (461); The extrusion plate (463) is connected at one end to the locking strip (462) and exposed at the other end.

5. The device for testing the crack resistance of concrete in production according to claim 1, characterized in that: The measurement component (7) includes: The main rod (71) is fixedly connected at one end to the auxiliary component (6); The connector (72) is fixed to the other end of the main rod (71), and a cable (73) is connected between it and the control center (5), and a drive unit is placed inside it; Rotary head (74) is rotatably mounted on the lower end of the connector (72); Receiver (75), fixed to the side of the rotating head (74); and A marker (76) is fixed to the lower end face of the rotating head (74), and a main laser element (77) and a secondary laser element (78) are slidably disposed on the lower end face of the marker (76).

6. The device for testing the crack resistance of concrete in production according to claim 5, characterized in that: The pointer (76) is equipped with a drive component to control the sliding of the main laser element (77) and the auxiliary laser element (78). The pointer (76) is set with a scale of 100mm starting from the rotating head (74). The main laser element (77) has an irradiation range of 100mm long and 1mm wide strip area, and the auxiliary laser element (78) has an irradiation range of 1mm diameter spot area.

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