Cement-based material multi-scale tensile creep test system

Abstract

The utility model discloses a cement-based material multi-scale tensile creep test system which comprises a base and a force application top plate, two load driving pieces are fixedly arranged between the base and the force application top plate, and a test part is arranged on the base and is used for carrying out a tensile creep test on a cement-based material. According to the utility model, the macroscopic creep generated by the cement-based material is tested through the test part and the load driving structure, amplified pictures of the surface of the material are periodically shot by using the digital microscope, acquired image data are corrected through the laser displacement sensor and the laser tilt angle sensor, and related data of digital images are adopted; calculating the microscopic strain of the observation area at each moment; according to the system structure, the applied load is accurate and adjustable, the test precision is high, the operation is simple, the macroscopic and microscopic tensile creep characteristics of the cement-based material can be tested at the same time, the test precision is high, and the system can be used for the multi-scale tensile creep test of the cement-based material under the long-time load holding condition.

Description

Technical Field

[0001] The utility model relates to the technical field of civil engineering material testing, in particular to a multi-scale tensile creep test system for cement-based materials. Background Art

[0002] A large number of tests show that whether concrete cracks or not depends not only on shrinkage, but is largely affected by tensile creep. Therefore, the research on tensile creep is of great significance. For the existing tensile creep testing devices, reference can be made to the Chinese patent application with the application number CN201510521901.X, which discloses a tensile load-holding loading frame for concrete members, including a bottom plate. Four threaded rods are evenly distributed at the edge of the bottom plate. At the same height on each threaded rod, a support plate is horizontally fixed. One end of a compression spring is connected to the support plate and passes through the threaded rod. The other end of the compression spring is connected to a loading device, and the loading device is locked on the threaded rod by a nut; a test piece with embedded parts is arranged on the bottom plate. One end of the upper end axis of the test piece is connected to one end of a tensile force sensor, and the other end of the tensile force sensor is connected to the loading device. The tensile load-holding loading frame for concrete members provided by this invention directly compresses the spring with a jack during loading, and then applies tensile force to the concrete according to the elastic force of the spring. The loading process is simple and easy to operate; the magnitude of the applied force is controlled by a pressure sensor, and the monitoring of the stress magnitude is realized according to the tensile force sensor, and timely supplementary loading can be carried out to ensure the accuracy of the magnitude of the held load.

[0003] However, the above scheme can only test the macroscopic tensile creep of cement-based materials under load, and cannot well characterize the microscopic creep of the materials. However, the weak areas and interfaces are the areas that should be focused on during the structural failure. How to test the tensile creep of the weak areas and interfaces of cement-based materials under variable loads is a technical problem to be solved urgently.

[0004] Therefore, it is necessary to invent a multi-scale tensile creep test system for cement-based materials to solve the above problems. Content of the Utility Model

[0005] The technical problem to be solved by the utility model is to provide a multi-scale tensile creep test system for cement-based materials in view of the above-mentioned deficiencies of the prior art. By using a digital microscope to periodically take magnified pictures of the material surface and adopting digital image correlation data, the microscopic strain of the observation area at each moment is calculated, so as to obtain the microscopic tensile creep of the cement-based materials, which can better characterize the microscopic creep of areas such as interfaces and weak areas at a specific age, so as to solve the problems put forward in the background art.

[0006] To solve the above technical problems, the technical solution adopted by the utility model is:

[0007] Cement-based material multi-scale tensile creep test system, including a base and a force-applying top plate. Two load driving components are fixedly installed between the base and the force-applying top plate. A test section is installed on the base for performing tensile creep tests on cement-based materials. A digital microscope is provided at a position on the base opposite to the test section for collecting surface image data during the creep generation process of the cement-based material. The connection end of the digital microscope is electrically connected to a computer terminal module. A load control system is provided on the base, and the load control system is connected to the computer terminal module for controlling the magnitude and loading rate of the load. The load driving component pushes the force-applying top plate to move upward relative to the base;

[0008] Sleeves penetrate through the four corners of the force-applying top plate, and the bottom ends of the sleeves are fixed to the top of the base. A load adjustment structure is provided on the outer side of the sleeve. The load adjustment structure includes a first stabilizing spring and a second stabilizing spring movably sleeved on the sleeve. The first stabilizing spring and the second stabilizing spring are respectively placed on the top of the base and the force-applying top plate. The bottom end of the first stabilizing spring abuts against an adjusting nut, and the top end of the second stabilizing spring abuts against a fixing nut. Both the fixing nut and the adjusting nut are threadedly connected to the sleeve.

[0009] Preferably, the base includes an installation table. Six support rods are installed at the bottom of the installation table. A telescopic spiral foot pad is installed at the bottom end of each support rod. A first shock isolation pad is provided between the spiral foot pad and the support rod.

[0010] Preferably, a spirit level bubble is provided on the installation table. By adjusting the telescopic spiral foot pads and cooperating with the spirit level bubble, the device is adjusted to a horizontal state.

[0011] Preferably, the test section includes a first clamping member and a second clamping member. The first clamping member and the second clamping member are respectively fixed on the force-applying top plate and the base. A clamping groove for clamping the specimen is provided between the first clamping member and the second clamping member. Displacement sensors are installed at both outer ends of the specimen for testing the macroscopic creep generated by the cement-based material. The connection end of the displacement sensor is wire-connected to a displacement collector. The connection end of the displacement collector is provided with a wireless communication module for transmitting displacement signals to the computer terminal module.

[0012] Preferably, a first universal joint is provided between the first clamping member and the force-applying top plate, and a second universal joint is provided between the second clamping member and the base to ensure that the specimen is in an axially tensile state.

[0013] Preferably, the load driving component includes a hydraulic jack and a spoke-type load sensor located on the hydraulic jack. The load driving component pushes the force-applying top plate upward to provide a stable tensile force for the specimen.

[0014] Preferably, the digital microscope includes a lens barrel and a microscope control module at its end. A magnification adjustment knob is provided on the lens barrel for adjusting the magnification of the lens barrel. An adjustable light source is provided at the end of the lens barrel, and both its light source type and brightness are adjusted through the microscope control module. The microscope control module is connected to a computer terminal module. A laser displacement sensor is provided between the adjustable light source and the outer wall of the lens barrel for measuring the distance from a reference point to the surface of the specimen. A laser inclination sensor is provided between the adjustable light source and the outer wall of the lens barrel for measuring the inclination angle between the axis of the lens barrel and the surface of the specimen.

[0015] Preferably, the digital microscope further includes a fixing plate and a lateral adjustment plate. Two lateral adjustment guide rails are provided on the fixing plate. A lateral adjustment knob penetrates through and is rotatably connected to the lateral adjustment plate. The bottom end of the lateral adjustment knob is driven by a gear-rack meshing structure with the lateral adjustment guide rail, causing the lateral adjustment plate to move horizontally relative to the fixing plate. A microscope frame is fixedly connected to the lateral adjustment plate. A front-back adjustment knob penetrates through and is rotatably connected to the microscope frame. A front-back adjustment guide rail is movably arranged on the microscope frame. The end of the front-back adjustment knob is driven by a gear-rack meshing structure with the front-back adjustment guide rail, causing the front-back adjustment guide rail to move back and forth relative to the microscope frame. A height adjustment knob penetrates through and is rotatably connected to the front-back adjustment guide rail. The end of the height adjustment knob is driven by a gear-rack meshing structure with the height adjustment guide rail, causing the height adjustment guide rail to move up and down relative to the front-back adjustment guide rail.

[0016] Preferably, a second shock isolation pad is provided between the lateral adjustment plate and the microscope frame.

[0017] Preferably, the load control system includes a switch, a manual rate adjustment key, a load information input module, a load display terminal, and a control main board. The switch, the manual rate adjustment key, the load information input module, and the load display terminal are all electrically connected to the control main board. A spoke-type load sensor is connected to the control main board by wires to control the tensile force applied to the specimen in real time.

[0018] The utility model has the following beneficial effects:

[0019] The macroscopic creep of cement-based materials is tested through the test part and the load driving structure. The digital microscope periodically takes magnified pictures of the material surface, and the collected image data is corrected by the laser displacement sensor and the laser inclination sensor. Digital image correlation data is used to calculate the microscopic strain in the observation area at each moment. The load applied in the system structure is accurately adjustable, the test accuracy is high, the operation is simple, and it can simultaneously test the macroscopic and microscopical tensile creep characteristics of cement-based materials, with high test accuracy, and can be used for multi-scale tensile creep testing of cement-based materials under long-term load conditions. Description of the Drawings

[0020] Figure 1 It is a schematic diagram of the overall structure of the multi-scale tensile creep test system for cement-based materials provided by the present utility model;

[0021] Figure 2 It is an application schematic diagram of the multi-scale tensile creep test system for cement-based materials provided by the present utility model;

[0022] Figure 3 It is a schematic diagram of the load driving module of the multi-scale tensile creep test system for cement-based materials provided by the present utility model;

[0023] Figure 4 It is a schematic diagram of the installation of the displacement sensor of the multi-scale tensile creep test system for cement-based materials provided by the present utility model;

[0024] Figure 5 For the present utility model Figure 4 Schematic diagram of the structure of the first clamping member and the second clamping member;

[0025] Figure 6 It is a schematic diagram of the structure of the digital microscope of the multi-scale tensile creep test system for cement-based materials provided by the present utility model;

[0026] Figure 7 It is a schematic diagram of the structure of the lens barrel of the multi-scale tensile creep test system for cement-based materials provided by the present utility model;

[0027] Figure 8 It is a schematic diagram of the structure of the load control system of the multi-scale tensile creep test system for cement-based materials provided by the present utility model.

[0028] Among them are:

[0029] Base - 1; Load driving member - 2; Force application top plate - 3; Sleeve - 4; Load adjustment structure - 5; Test section - 6; Digital microscope - 7; Computer terminal module - 8; Load control system - 9;

[0030] Installation table - 11; Support rod - 12; Screw foot pad - 13; First shock isolation pad - 14; Level bubble - 15;

[0031] Hydraulic jack - 21; Spoke type load sensor - 22;

[0032] First stabilizing spring - 51; Second stabilizing spring - 52; Fixed nut - 53; Adjusting nut - 54;

[0033] First clamping member - 61; Second clamping member - 62; Specimen - 63; Displacement sensor - 64; Displacement collector - 65; Wireless communication module - 66; First universal joint - 67; Second universal joint - 68;

[0034] Fixed plate - 71; Lateral adjustment plate - 72; Lateral adjustment knob - 73; Microscope frame - 74; Front - and - rear adjustment knob - 75; Height adjustment knob - 76; Microscope tube - 77; Microscope control module - 78;

[0035] Switch - 91; Manual rate adjustment key - 92; Load information input module - 93; Load display terminal - 94;

[0036] Lateral adjustment guide rail - 711; Front - and - rear adjustment guide rail - 751; Magnification adjustment knob - 771; Adjustable light source - 772; Laser displacement sensor - 773; Laser inclination sensor - 774; Second shock isolation pad - 741; Height adjustment guide rail - 761. Specific implementation mode

[0037] The present utility model will be further described in detail below in conjunction with the drawings and specific preferred embodiments.

[0038] In the description of the present utility model, it should be understood that the orientation or positional relationships indicated by terms such as "left side", "right side", "upper part", "lower part", etc. are based on the orientation or positional relationships shown in the drawings. These are only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. "First", "second", etc. do not represent the importance of the components, so they should not be construed as limiting the present utility model. The specific dimensions adopted in this embodiment are only for illustrating the technical solution and do not limit the protection scope of the present utility model.

[0039] As Figure 1-8 shown, a multi - scale tensile creep test system for cement - based materials includes a base 1 and a force - applying top plate 3. Two load driving members 2 are fixedly installed between the base 1 and the force - applying top plate 3. A test section 6 is installed on the base 1 for conducting tensile creep tests on cement - based materials. A digital microscope 7 is provided at a position on the base 1 opposite to the test section 6 for collecting surface image data during the creep generation process of the cement - based materials. The digital microscope 7 periodically takes magnified pictures of the material surface, and corrects the collected image data through a laser displacement sensor and a laser inclination sensor. Digital image - related data is used to calculate the microscopic strain of the observation area at each moment. The connection end of the digital microscope 7 is electrically connected to a computer terminal module 8. A load control system 9 is provided on the base 1, and the load control system 9 is connected to the computer terminal module 8 for controlling the magnitude and loading rate of the load. The load driving member 2 pushes the force - applying top plate 3 to move upward relative to the base 1;

[0040] The four corners of the force - applying top plate 3 are all penetrated by sleeves 4, and the bottom ends of the sleeves 4 are fixed to the top of the base 1. A load - adjusting structure 5 is arranged outside the sleeves 4. The load - adjusting structure 5 includes a first stabilizing spring 51 and a second stabilizing spring 52 movably sleeved on the sleeves 4. The first stabilizing spring 51 and the second stabilizing spring 52 are respectively placed on the top of the base 1 and the force - applying top plate 3. A regulating nut 54 abuts against the bottom end of the first stabilizing spring 51, and a fixing nut 53 abuts against the top end of the second stabilizing spring 52. Both the fixing nut 53 and the regulating nut 54 are threadedly connected to the sleeves 4. The fixing nut 53 and the regulating nut 54 are respectively used to adjust the tightness of the second stabilizing spring 52 and the first stabilizing spring 51, reducing the eccentric loading of the load driving member 2.

[0041] As an implementation manner of the base 1 in the present utility model:

[0042] The base 1 includes a mounting table 11. Six support rods 12 are installed at the bottom of the mounting table 11. A telescopic spiral foot pad 13 is installed at the bottom end of each support rod 12. A first shock - isolation pad 14 is arranged between the spiral foot pad 13 and the support rod 12, which is used to reduce the interference of external vibrations.

[0043] Specifically, a spirit level bubble 15 is arranged on the mounting table 11. By adjusting the telescopic spiral foot pads 13 and cooperating with the spirit level bubble 15, the device is adjusted to a horizontal state.

[0044] As an implementation manner of the test part 6 in the present utility model:

[0045] The test part 6 includes a first clamping member 61 and a second clamping member 62. The first clamping member 61 and the second clamping member 62 are respectively fixed on the force - applying top plate 3 and the base 1. A clamping groove for clamping the test piece 63 is arranged between the first clamping member 61 and the second clamping member 62. Displacement sensors 64 are installed at both outer ends of the test piece 63, which are used to test the macroscopic creep generated by the cement - based material. The wire at the connecting end of the displacement sensor 64 is connected to a displacement collector 65. A wireless communication module 66 is arranged at the connecting end of the displacement collector 65, which is used to transmit displacement signals to the computer terminal module 8. The computer terminal module 8 collects the image information and data transmitted from the displacement sensor 64 and the digital microscope 7.

[0046] Specifically, a first universal joint 67 is arranged between the first clamping member 61 and the force - applying top plate 3, and a second universal joint 68 is arranged between the second clamping member 62 and the base 1, which is used to ensure that the test piece 63 is in the state of axial tension.

[0047] As an implementation manner of the load driving member 2 in the present utility model:

[0048] The load driving component 2 includes a hydraulic jack 21 and a spoke-type load sensor 22 located on the hydraulic jack 21 . The load driving component 2 pushes the force applying top plate 3 upward to provide a stable pulling force for the test piece 63 .

[0049] Specifically, the digital microscope 7 includes a lens barrel 77 and a microscope control module 78 at its end. The lens barrel 77 is provided with a magnification adjustment knob 771 for adjusting the magnification of the lens barrel 77. The end of the lens barrel 77 is provided with an adjustable light source 772, the type and brightness of which are adjusted by the microscope control module 78. The microscope control module 78 is connected to the computer terminal module 8, which receives the image and digital information transmitted by the microscope control module 78 and controls the sampling frequency and image size of the digital microscope 7. The microscope control module 78 is provided with a switch, a light source type adjustment key, a light brightness adjustment key, and a light source type adjustment key. Adjustment keys and a display module, wherein the display module is used to display the light source type, light brightness, and the distance between the digital microscope 7 and the surface of the test piece 63, and the inclination angle between the axis of the test tube 77 and the surface of the test piece 63. A laser displacement sensor 773 is provided between the adjustable light source 772 and the outer wall of the test tube 77 for measuring the distance from the reference point to the surface of the test piece 63 and calculating the length expressed in units of pixels based on the relationship between the distance and the magnification. A laser inclination sensor 774 is provided between the adjustable light source 772 and the outer wall of the test tube 77 for measuring the inclination angle between the axis of the test tube 77 and the surface of the test piece 63, thereby correcting the image in the later stage.

[0050] The digital microscope 7 also includes a fixed plate 71 and a lateral adjustment plate 72. Two lateral adjustment guide rails 711 are provided on the fixed plate 71. A lateral adjustment knob 73 passes through and is rotatably connected to the lateral adjustment plate 72. The bottom end of the lateral adjustment knob 73 and the lateral adjustment guide rail 711 are driven by a gear rack meshing structure to make the lateral adjustment plate 72 and the fixed plate 71 move laterally. A microscope frame 74 is fixedly connected to the lateral adjustment plate 72, and a front and rear adjustment knob 75 passes through and is rotatably connected to the microscope frame 74. A front and rear adjustment guide rail 751 is movably provided on the microscope frame 74, and the end of the front and rear adjustment knob 75 and the front and rear adjustment guide rail 751 are driven by a gear rack meshing structure to make the front and rear adjustment guide rail 751 and the microscope frame 74 move forward and backward. A height adjustment knob 76 passes through and is rotatably connected to the front and rear adjustment guide rail 751, and the end of the height adjustment knob 76 and the height adjustment guide rail 761 are driven by a gear rack meshing structure to make the height adjustment guide rail 761 and the front and rear adjustment guide rail 751 move up and down.

[0051] Specifically, a second vibration isolation pad 741 is provided between the transverse adjustment plate 72 and the microscope frame 74 to reduce the influence of instrument vibration on the microscope image capturing effect.

[0052] As an implementation of the load control system 9 of the present utility model:

[0053] The load control system 9 includes a switch 91, a manual rate adjustment key 92, a load information input module 93, a load display terminal 94, and a control main board. The switch 91, the manual rate adjustment key 92, the load information input module 93, and the load display terminal 94 are all electrically connected to the control main board. The spoke-type load sensor 22 is connected to the control main board by wires to control the tensile force applied to the test piece 63 in real time.

[0054] When the present utility model is in use, a test piece 63 made of a cement-based material is inserted into the card slot between the first clamping member 61 and the second clamping member 62. The load control system 9 cooperates with the computer terminal module 8 to control the magnitude and loading rate of the load. The load driving member 2 pushes the force-applying top plate 3 to move upward relative to the base 1 to stretch the cement-based material and conduct a creep test, so that the test piece 63 is in an axially tensile state. The digital microscope 7 collects the surface image data during the creep generation process of the cement-based material, periodically takes magnified pictures of the material surface by using the digital microscope 7, and corrects the collected image data by using a laser displacement sensor and a laser inclination sensor, and adopts digital image correlation data to calculate the microscopic strain of the observation area at each moment.

[0055] The above has described the embodiments of the present utility model in detail with reference to the accompanying drawings, but the present utility model is not limited to the described embodiments. For those skilled in the art, without departing from the principle and spirit of the present utility model, various changes, modifications, substitutions, and variations made to these embodiments still fall within the protection scope of the present utility model.

Claims

1. Multi-scale tensile creep test system for cement-based materials, characterized in that: It includes a base (1) and a force - applying top plate (3). Between the base (1) and the force - applying top plate (3), two load - driving members (2) are fixedly installed. On the base (1), a test section (6) is installed for the tensile creep test of cement - based materials. And at the relative position of the test section (6) on the base (1), a digital microscope (7) is provided for collecting surface image data during the creep generation process of the cement - based materials. The connection end of the digital microscope (7) is electrically connected to a computer terminal module (8). On the base (1), a load control system (9) is provided, and the load control system (9) is connected to the computer terminal module (8) for controlling the magnitude and loading rate of the load. The load - driving member (2) pushes the force - applying top plate (3) to move upward relative to the base (1). At the four corners of the force - applying top plate (3), sleeves (4) penetrate through. The bottom ends of the sleeves (4) are fixed to the top of the base (1). On the outer side of the sleeves (4), a load - adjusting structure (5) is provided. The load - adjusting structure (5) includes a first stabilizing spring (51) and a second stabilizing spring (52) movably sleeved on the sleeves (4). The first stabilizing spring (51) and the second stabilizing spring (52) are respectively placed on the top of the base (1) and the force - applying top plate (3). The bottom end of the first stabilizing spring (51) abuts against an adjusting nut (54). The top end of the second stabilizing spring (52) abuts against a fixing nut (53). And both the fixing nut (53) and the adjusting nut (54) are threadedly connected to the sleeves (4).

2. The multi-scale tensile creep test system for cement-based materials according to claim 1, characterized in that: The base (1) includes a mounting table (11). At the bottom of the mounting table (11), six support rods (12) are installed. At the bottom end of each support rod (12), a telescopic screw foot pad (13) is installed. Between the screw foot pad (13) and the support rod (12), a first shock - isolation pad (14) is provided.

3. The multi-scale tensile creep test system for cement-based materials according to claim 2, characterized in that: On the mounting table (11), a spirit level bubble (15) is provided. By adjusting the telescopic screw foot pads (13) and cooperating with the spirit level bubble (15), the device is adjusted to a horizontal state.

4. The multi-scale tensile creep test system for cement-based materials according to claim 1, wherein: The test section (6) includes a first clamping member (61) and a second clamping member (62). The first clamping member (61) and the second clamping member (62) are respectively fixed on the force - applying top plate (3) and the base (1). Between the first clamping member (61) and the second clamping member (62), a clamping groove for clamping a specimen (63) is provided. And at both outer ends of the specimen (63), displacement sensors (64) are installed for testing the macroscopic creep generated by the cement - based materials. The connection end of the displacement sensor (64) is wire - connected to a displacement collector (65). The connection end of the displacement collector (65) is provided with a wireless communication module (66) for transmitting displacement signals to the computer terminal module (8).

5. The multi-scale tensile creep test system for cement-based materials according to claim 4, characterized in that: Between the first clamping member (61) and the force - applying top plate (3), a first universal joint (67) is provided. Between the second clamping member (62) and the base (1), a second universal joint (68) is provided for ensuring that the specimen (63) is in an axially - tensioned state.

6. The multi-scale tensile creep test system for cement-based materials according to claim 4, characterized in that: The load driving member (2) includes a hydraulic jack (21) and a spoke-type load sensor (22) located on the hydraulic jack (21). The load driving member (2) pushes the force-applying top plate (3) upward to provide a stable pulling force for the test piece (63).

7. The multi-scale tensile creep test system for cement-based materials according to claim 1, characterized in that: The digital microscope (7) comprises a lens barrel (77) and a microscope control module (78) at its end. The lens barrel (77) is provided with a magnification adjustment knob (771) for adjusting the magnification of the lens barrel (77). An adjustable light source (772) is provided at the end of the lens barrel (77), and the type and brightness of the light source are adjusted by the microscope control module (78). The microscope control module (78) is connected to a computer terminal module (8). A laser displacement sensor (773) is provided between the adjustable light source (772) and the outer wall of the lens barrel (77) for measuring the distance from a reference point to the surface of a test piece (63). A laser inclination sensor (774) is provided between the adjustable light source (772) and the outer wall of the lens barrel (77) for measuring the inclination angle between the axis of the lens barrel (77) and the surface of the test piece (63).

8. The multi-scale tensile creep test system for cement-based materials according to claim 7, characterized in that: The digital microscope (7) further comprises a fixed plate (71) and a transverse adjustment plate (72), wherein the fixed plate (71) is provided with two transverse adjustment guide rails (711), the transverse adjustment plate (72) is penetrated and rotatably connected with a transverse adjustment knob (73), the bottom end of the transverse adjustment knob (73) and the transverse adjustment guide rail (711) are driven by a gear rack meshing structure, so that the transverse adjustment plate (72) and the fixed plate (71) move transversely, the transverse adjustment plate (72) is fixedly connected with a microscope frame (74), and the microscope frame (74) is penetrated and rotatably connected with a front and rear adjustment knob (73). A front-rear adjustment guide rail (751) is movably provided on the microscope frame (74), and the end of the front-rear adjustment knob (75) and the front-rear adjustment guide rail (751) are driven by a gear rack meshing structure, so that the front-rear adjustment guide rail (751) and the microscope frame (74) move forward and backward, and a height adjustment knob (76) is passed through and rotatably connected to the front-rear adjustment guide rail (751), and the end of the height adjustment knob (76) and the height adjustment guide rail (761) are driven by a gear rack meshing structure, so that the height adjustment guide rail (761) and the front-rear adjustment guide rail (751) move up and down.

9. The multi-scale tensile creep test system for cement-based materials according to claim 8, characterized in that: A second vibration isolation pad (741) is provided between the transverse adjustment plate (72) and the microscope frame (74).

10. The multi-scale tensile creep test system for cement-based materials according to claim 1, wherein: The load control system (9) comprises a switch (91), a manual speed adjustment key (92), a load information input module (93), a load display terminal (94) and a control main board. The switch (91), the manual speed adjustment key (92), the load information input module (93) and the load display terminal (94) are all electrically connected to the control main board. The spoke-type load sensor (22) is connected to the control main board wire to control the tension applied to the test piece (63) in real time.

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