System and method for testing strength of cement mortar test piece
By conducting flexural and compressive strength tests on the same equipment and utilizing an automatic cleaning device with a rotating loading shaft and clamping mechanism, the problems of specimen transfer error and end face cleaning in cement mortar specimen strength testing were solved, thus achieving accuracy and continuity of test results.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- SICHUAN HIGHWAY PLANNING SURVEY DESIGN AND RESEARCH INSTITUTE LTD
- Filing Date
- 2026-04-09
- Publication Date
- 2026-05-12
- Estimated Expiration
- Not applicable · inactive patent
AI Technical Summary
In existing cement mortar specimen strength testing, there are errors in specimen transfer and repositioning between flexural and compressive strength tests. Improper cleaning of fracture end faces affects the accuracy of test results, and discontinuous operation procedures lead to increased data dispersion.
A cement mortar specimen strength testing system is designed, which uses the same equipment to conduct flexural and compressive strength tests. By switching the rotating loading axis, using a clamping mechanism and an automatic cleaning device, the system ensures that the specimens are continuously loaded on the same axis, reducing human error and keeping the end faces clean.
This improved the consistency and stability of data from flexural and compressive strength tests, reduced specimen transfer errors, and ensured the accuracy and continuity of test results.
Smart Images
Figure CN122016482A_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of cement mortar specimen strength testing technology, and in particular to a cement mortar specimen strength testing system and testing method. Background Technology
[0002] Cement mortar strength is an important indicator for evaluating the performance of cement and related cementitious materials. Current strength testing methods typically use standard-sized specimens for flexural and compressive strength tests to determine the material's flexural and compressive strength, respectively. Taking the conventional standard method as an example, the specimen first undergoes a three-point bending flexural test. After flexural failure, two half-specimens are obtained, and then each half-specimen is subjected to a compressive strength test.
[0003] In existing testing procedures, flexural and compressive tests are typically performed separately on the same testing machine or on different testing equipment. After flexural testing, the operator must remove the fractured half-specimen, clean the loose particles or dust from the fracture surface, and reposition it between the upper and lower pressure plates of the compression device for loading. The compressive test usually employs a uniaxial unconfined compression method, applying axial load only through the upper and lower pressure plates, with the sides of the specimen in a state of free expansion, to determine the maximum load-bearing capacity of the specimen before crushing or instability.
[0004] The aforementioned traditional methods have developed relatively mature operating procedures through long-term application, but several shortcomings still exist in actual testing: First, there is a specimen transfer and repositioning process between the flexural and compressive tests. The fractured half-specimen requires manual handling, flipping, and repositioning, which can easily introduce posture deviations and alignment errors, affecting the consistency between the compressive loading axis and the geometric center of the specimen. This leads to increased dispersion in test results, and time differences may affect the consistency of compressive results. Second, the fracture surface of the specimen after flexural failure usually contains dust, loose particles, and irregular protrusions. If not properly cleaned, this may lead to point contact or uneven contact between the pressure plate and the specimen, causing localized stress concentration and affecting the accurate determination of the compressive ultimate load. Furthermore, cleaning by washing or other methods may alter the surface moisture content of the specimen, interfering with the compressive strength.
[0005] Therefore, it is necessary to propose an improved technical solution that can complete flexural and compressive tests within the same testing system, reduce specimen transfer errors, improve the contact state of fracture ends, and enhance test consistency. Summary of the Invention
[0006] The purpose of this invention is to provide a cement mortar specimen strength testing system and method to solve the above-mentioned problems.
[0007] The first aspect of the present invention is achieved through the following technical solution: A cement mortar specimen strength testing system includes: A test platform is provided, which is equipped with a pressure device. The pressure device is equipped with a main loading shaft and a pressure block. Both the main loading shaft and the pressure block are used to apply load by providing displacement downward along the same axis. The loading unit includes a support and a liner located below the main loading shaft. The liner is located on the top surface of the support and includes a first pressure plate and a second pressure plate. The top surfaces of the first pressure plate and the second pressure plate are each provided with a load-bearing shaft. The two load-bearing shafts are arranged close to the center of the support and are symmetrically distributed. The first pressure plate has a through hole and is slidably connected to one end of the support along its length. The second pressure plate is fixedly connected to the other end of the support. A clamping mechanism is located on one side of the loading unit along its length. The clamping mechanism includes a limiting frame and a support rod. The support rod is vertically arranged on the top surface of the test platform, and the limiting frame can slide along the axial direction of the support rod. The pressure device can rotate and switch the orientation of the main loading shaft and the pressure block, such that one of the main loading shaft or the pressure block is located above the loading unit.
[0008] The above technical solution enables flexural and compressive tests to be performed on the same equipment, avoiding eccentricity errors caused by secondary handling of specimens and improving the continuity between flexural and compressive tests; it also ensures consistency in loading direction and improves data comparability.
[0009] Preferably, the test platform is further provided with a push plate, which is located on the side of the first pressure plate away from the second pressure plate, and the total length of the first pressure plate and the second pressure plate is greater than the length of the support.
[0010] In the above technical solution, the pusher plate realizes the automatic transfer of fractured specimens, reduces manual contact, reduces disturbance, and improves the continuity of the test.
[0011] Preferably, the first pressure plate has a groove on the side facing the second pressure plate, and the second pressure plate has a support block on the side near the first pressure plate for engaging with the groove.
[0012] In the above technical solution, the first pressure plate and the second pressure plate are precisely connected through grooves and support blocks to enhance the overall rigidity of the structure and improve the clamping stability of the compression test.
[0013] Preferably, the support includes two symmetrically arranged first and second upright plates, the second upright plate being located below the second pressure plate, and a base plate being slidably connected between the first and second upright plates.
[0014] In the above technical solution, the first and second upright plates provide a vertical bearing platform for the specimen, ensuring vertical stability during loading and improving the axial alignment accuracy of the compression test.
[0015] Preferably, the first upright plate has a clearance groove extending along its thickness, and a positioning block is connected to the bottom surface of the first pressure plate. The positioning block is located near the edge of the through hole, and the longitudinal dimension of the clearance groove is larger than the longitudinal cross-sectional dimension of the positioning block.
[0016] In the above technical solution, the broken specimen will touch the positioning block as it moves along the base plate. The positioning block is used to locate the position of the broken specimen in the compressive strength test, so as to ensure the accuracy of the experimental data.
[0017] Preferably, the test platform has several threaded holes, and a screw is threaded into each threaded hole. A push block is provided at the top of the screw, the top surface of which is used to abut against the bottom surface of the base plate, and a rotating sleeve connected to the screw is provided at the bottom of the push block.
[0018] In the above technical solution, the screw and threaded hole can achieve fine adjustment of the specimen height, ensuring reliable contact between the pressure plate and the specimen.
[0019] Preferably, the thickness of the second upright plate is greater than the thickness of the first upright plate, and the second upright plate has a through groove along the thickness direction, with cleaning cloths provided on the upper and lower sides of the through groove.
[0020] In the above technical solution, the cleaning cloth can automatically clean the specimen during movement and remove loose particles from the fracture surface.
[0021] Preferably, the limiting frame includes a first clamping plate and a second clamping plate, the distance between the second clamping plate and the first clamping plate is adjustable, a fixing sleeve is rotatably connected to the side of the first clamping plate away from the second pressure plate, the fixing sleeve is slidably connected to the support rod, and a cleaning cloth is also provided on the surfaces of the first clamping plate and the second clamping plate facing each other.
[0022] In the above technical solution, the distance between the second clamping plate and the first clamping plate is adjustable to accommodate specimens with different size errors, and provides lateral restraint to improve compressive centering.
[0023] The first aspect of the present invention is achieved through the following technical solution: A method for testing the strength of cement mortar specimens, based on the testing system described in the first aspect of the present invention, is used to test the strength of cement mortar specimens, and flexural and compressive strength tests are performed using a loading unit and a clamping mechanism, respectively.
[0024] Preferably, it includes the following steps: S1. Pre-test preparation; including the fabrication of the test piece and the adjustment of the test system; S2, flexural strength test; S21. Adjust the load-bearing shafts on the first and second pressure plates to be symmetrically distributed along the center of the support, and place the test piece on the two load-bearing shafts. S22. Adjust the main loading shaft of the pressure device to rest against the top surface of the test piece, adjust the parameters, and gradually apply pressure to the test piece; S23. The test piece is broken, resulting in two broken test pieces; S24. Record parameter information; S3, Compression test; S31. Send one of the broken specimens into the limiting frame; S32. Use the screw to adjust the bottom plate to rise, while controlling the limit frame to fall along the support rod; S33. Control the push plate to contact the first pressure plate with the second pressure plate, and continue to adjust the bottom plate to rise until the positioning block and the bottom plate are in contact and connected. S34. Control the broken specimen in the limit frame to move through the through groove of the second vertical plate along the top of the bottom plate until the broken specimen touches the positioning block; S35. Adjust and replace the pressure device, place the pressure head on the first pressure plate and press it through the through hole onto the broken specimen, and apply pressure; S36. The specimen breaks, and the test ends. S37. Record data.
[0025] Compared with the prior art, the present invention has the following advantages and beneficial effects: The testing system of this invention can continuously perform flexural and compressive tests on the same equipment, ensuring that the two tests share the same loading axis and improving data consistency. During the movement of the fractured specimen, the specimen can be cleaned and the distance between the base plate and the first pressure plate can be adjusted to firmly clamp the fractured specimen, thereby conducting the compressive test and improving the stability of the compressive test. Attached Figure Description
[0026] The accompanying drawings, which are included to provide a further understanding of embodiments of the invention and form part of this application, do not constitute a limitation thereof. In the drawings: Figure 1 This is a schematic diagram of the test system of the present invention during a flexural strength test; Figure 2 This is a schematic diagram of the test system of the present invention during a compression test; Figure 3 This is a schematic diagram of the structure of the base plate and screw in this invention.
[0027] The reference numerals in the attached figures represent: 1. Test platform; 11. Pressure equipment; 12. Push plate; 13. Support rod; 2. Support; 21. Through groove; 31. First pressure plate; 311. Positioning block; 32. Second pressure plate; 33. Load-bearing shaft; 4. Base plate; 5. Screw; 51. Push block; 52. Rotating sleeve; 6. Limiting frame; 7. Fixing sleeve. Detailed Implementation
[0028] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to embodiments and accompanying drawings. The illustrative embodiments and descriptions of this invention are for illustrative purposes only and are not intended to limit the invention. It should be noted that this invention is already in the actual research and development stage.
[0029] Example 1: like Figure 1 and Figure 2 As shown, this embodiment provides a cement mortar specimen strength testing system, including: Test platform 1, on which pressure device 11 is provided, and pressure device 11 is provided with main loading shaft and pressure block, both of which are used to apply load by providing displacement downward on the same axis; The loading unit includes a support 2 located below the main loading shaft and a liner plate. The liner plate is located on the top surface of the support 2. The liner plate includes a first pressure plate 31 and a second pressure plate 32. The top surfaces of the first pressure plate 31 and the second pressure plate 32 are provided with load-bearing shafts 33. The two load-bearing shafts 33 are arranged close to the center of the support 2 and are symmetrically distributed. The first pressure plate 31 has a through hole and is slidably connected to one end of the support 2 in the length direction. The second pressure plate 32 is fixedly connected to the other end of the support 2. The clamping mechanism is located on one side of the loading unit along its length. The clamping mechanism includes a limiting frame 6 and a support rod 13. The support rod 13 is vertically set on the top surface of the test platform 1, and the limiting frame 6 can slide along the axial direction of the support rod 13. The pressure device 11 can rotate and switch the orientation of the main loading shaft and the pressure block, so that one of the main loading shaft or the pressure block is located above the loading unit.
[0030] like Figures 1 to 3 As shown, the support 2 includes two symmetrically arranged first and second upright plates. The second upright plate is located below the second pressure plate 32, and a base plate 4 is slidably connected between the first and second upright plates.
[0031] Specifically, the support 2 is fixed on the top surface of the test platform 1. The support 2 includes two symmetrically arranged first and second upright plates. The first pressure plate 31 can be slidably connected along the first upright plate. A corresponding groove can be opened on the first upright plate for the first pressure plate 31 to slide, ensuring smooth sliding and the centering of the first pressure plate 31. The second pressure plate 32 is fixedly connected to the second upright plate.
[0032] When performing strength tests on cement mortar specimens: adjust the positions of the first pressure plate 31 and the second pressure plate 32, keeping the load-bearing shafts 33 at their top ends symmetrically distributed along the center of the support 2. Then place the specimen to be tested on the two load-bearing shafts 33, keeping them aligned with the center of the support 2. After placement, adjust the pressure device 11, placing the main loading shaft of the pressure device 11 on the top surface of the specimen to be tested. Then start the pressure device 11, applying pressure to the specimen along the main loading shaft until the specimen breaks.
[0033] Preferably, the pressure device 11 is equipped with a rotary table, and the main loading shaft and the pressure block are located on the rotary table. By rotating the rotary table, the orientation of the main loading shaft and the pressure block can be changed. According to different tests, the main loading shaft and the pressure block are respectively oriented towards the support 2.
[0034] Example 2: like Figure 1 and Figure 2 As shown, a push plate 12 is also provided on the test platform 1. The push plate 12 is located on the side of the first pressure plate 31 away from the second pressure plate 32. The total length of the first pressure plate 31 and the second pressure plate 32 is greater than the length of the support 2.
[0035] like Figure 1 and Figure 2 As shown, the first pressure plate 31 has a groove on the side facing the second pressure plate 32, and the second pressure plate 32 has a support block on the side near the first pressure plate 31 for engaging with the groove.
[0036] like Figures 1 to 3 As shown, the first vertical plate has a relief groove extending along its thickness, and the bottom surface of the first pressure plate 31 is connected to a positioning block 311. The positioning block 311 is located near the edge of the through hole, and the longitudinal opening dimension of the relief groove is larger than the longitudinal cross-sectional dimension of the positioning block 311.
[0037] like Figures 1 to 3 As shown, the test platform 1 has several threaded holes, and a screw 5 is threadedly connected to the threaded hole. A push block 51 is provided at the top of the screw 5. The top surface of the push block 51 is used to abut against the bottom surface of the base plate 4. A rotating sleeve 52 connected to the screw 5 is provided at the bottom of the push block 51.
[0038] like Figures 1 to 3 As shown, the thickness of the second vertical plate is greater than that of the first vertical plate, and the second vertical plate has a through groove 21 along the thickness direction.
[0039] Specifically, the first and second upright plates are fixedly connected to the top surface of the test platform 1. The test platform 1 is also provided with a sliding groove, and the push plate 12 is slidably connected in the sliding groove. The push plate 12 is fixedly connected to the first pressure plate 31. The first pressure plate 31 and the second pressure plate 32 abut against each other through the snap-fit of the groove and the support block. Since the push plate 12 and the first pressure plate 31 are fixedly connected, and the bottom surface of the first pressure plate 31 is supported by the first upright plate, the first pressure plate 31 can provide stable support in the breakage test in Embodiment 1 and will not tilt due to the force applied by the pressure device 11.
[0040] After the fracture test was completed in Example 1, the test piece was broken into two fractured test pieces. Since the second pressure plate 32 is connected to the support block, it provides certain support for the fractured test pieces. Therefore, the two fractured test pieces will not easily fall into the bracket. Then, the push plate 12 is pushed, and the push plate 12 pushes the first pressure plate 31 to move towards the second pressure plate 32 until the support block is stuck in the groove. At this time, the first pressure plate 31 and the second pressure plate 32 together cover the bottom plate 4.
[0041] During the movement of the first pressure plate 31, the two broken specimens and the positioning block 311 will also move. Preferably, the top of the push plate 12 is rotatably connected to a push rod for pushing the broken specimens. During the compression test, the push rod rotates out and does not affect the test operation. The broken specimen near the first pressure plate 31 is pushed into the limiting frame 6. The limiting frame 6 clamps the broken specimen and slides down along the support rod 13. Then, the broken specimen in the limiting frame 6 is placed on the base plate 4 through the through slot 21 on the second upright plate. The positioning block 311 will also pass through the clearance slot of the first upright plate during the movement until the first pressure plate 31 and the second pressure plate 32 are engaged.
[0042] A rotating sleeve 52 and a push block 51 are fixedly connected to the screw 5. By rotating the rotating sleeve 52, the screw 5 rises along the threaded hole on the test platform 1, and pushes the push base to rise until the top surface of the base and the bottom surface of the first pressure plate 31 clamp the broken specimen together. Preferably, there are two threaded holes and two screws 5, which are arranged along the axial direction of the load-bearing shaft 33. A connecting plate is fixedly connected between the two push blocks 51. The top surface of the connecting plate and the top surface of the push block 51 are in the same plane and parallel to the horizontal plane. This setting allows the rotating sleeves 52 on both sides to be operated at the same time, so that the screws 5 rise synchronously. Even if the rising speed of one screw 5 is faster than that of the other screw 5, the setting of the connecting plate can keep the two push blocks 51 in the same plane, thereby controlling the base plate 4 to remain parallel and avoiding tilting that would affect the test results. Finally, the pressure device 11 is adjusted, and the pressure head is placed on the top surface of the first pressure plate 31 to start the compressive strength test.
[0043] Regarding the compression test: After the positions of the first pressure plate 31 and the base plate 4 are adjusted as described above, the broken specimen in the limiting frame 6 is sent onto the base plate 4. The broken specimen is moved until it touches the positioning block 311, which means that the broken specimen has been moved to the designated position. The positioning block 311 is set near the through hole of the first pressure plate 31. With the positioning block 311, the pressure head can pass through the through hole and directly press on the surface of the broken specimen to carry out the compression test. The positioning block 311 is fixed to the first pressure plate 31 and will not exert a restraining force on the broken specimen, so it is not easy to affect the test results.
[0044] Example 3: Cleaning cloths are provided on the upper and lower sides of the through groove 21.
[0045] like Figure 1 and Figure 2 As shown, the limiting frame 6 includes a first clamping plate and a second clamping plate. The distance between the second clamping plate and the first clamping plate is adjustable. A fixing sleeve 7 is rotatably connected to the side of the first clamping plate away from the second pressure plate 32. The fixing sleeve 7 is slidably connected to the support rod 13. A cleaning cloth is also provided on the surfaces of the first clamping plate and the second clamping plate facing each other.
[0046] Specifically, a compression test must be performed immediately after the flexural test. After the flexural test, the test specimen will break into two broken specimens. After the breakage, there will be burrs, particles or dust on the surface. During the compression test, the surface of the broken specimen must be kept clean. In Example 2, when one of the broken specimens is sent into the limiting frame 6, the cleaning cloth on the first and second clamps of the limiting frame 6 will wipe the surface of the upper and lower sides of the broken specimen.
[0047] Preferably, the distance between the second clamping plate and the first clamping plate is adjustable. The second clamping plate and the first clamping plate can be hinged, slidably connected, or connected by a screw drive, such as the connection method of an adjustable wrench. The side of the first clamping plate near the support rod 13 is rotatably connected to the fixing sleeve 7 via a rotating shaft. The fixing sleeve 7 is slidably connected to the support rod 13. After the broken specimen enters the limiting frame 6, the limiting frame 6 is rotated 90° to make the original left and right sides of the broken specimen parallel to each other in the horizontal direction. Then, the fixing sleeve 7 is slid to send the broken specimen into the bottom plate 4 through the through groove 21. When passing through the through groove 21, it will pass through a cleaning cloth to further clean the original left and right sides of the broken specimen.
[0048] Example 4: A method for testing the strength of cement mortar specimens, based on the testing system of Examples 1-3, is used to test the strength of cement mortar specimens, and flexural and compressive strength tests are performed using a loading unit and a clamping mechanism, respectively.
[0049] Includes the following steps: S1. Pre-test preparation; including the fabrication of the test piece and the adjustment of the test system; S2, flexural strength test; S21. Adjust the load-bearing shafts 33 on the first pressure plate 31 and the second pressure plate 32 to be symmetrically distributed along the center of the support 2, and place the test piece on the two load-bearing shafts 33. S22. Adjust the main loading shaft of the pressure device 11 to press against the top surface of the test piece, adjust the parameters, and gradually apply pressure to the test piece; S23. The test piece is broken, resulting in two broken test pieces; S24. Record parameter information; S3, Compression test; S31. Send one of the broken specimens into the limiting frame 6; S32. Use screw 5 to adjust the bottom plate 4 to rise, and at the same time control the limit frame 6 to fall along the support rod 13; S33, control the push plate 12 to contact the first pressure plate 31 with the second pressure plate 32, and continue to adjust the bottom plate 4 to rise until the positioning block 311 and the bottom plate 4 are in contact and connected. S34. The broken specimen in the control limit frame 6 moves along the top of the bottom plate through the through groove of the second vertical plate until the broken specimen touches the positioning block 311. S35. Adjust and replace the pressure device 11, place the pressure head on the first pressure plate 31, pass it through the through hole, press it against the broken specimen, and apply pressure; S36. The specimen breaks, and the test ends. S37. Record data.
[0050] The specific embodiments described above further illustrate the purpose, technical solution, and beneficial effects of the present invention. It should be understood that the above description is only a specific embodiment of the present invention and is not intended to limit the scope of protection of the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.
Claims
1. A cement mortar specimen strength testing system, characterized in that, include: Test platform (1), on which a pressure device (11) is provided, and on which a main loading shaft and a pressure block are provided, the main loading shaft and the pressure block are both used to apply load by providing displacement downward on the same axis; The loading unit includes a support (2) and a liner located below the main loading shaft. The liner is located on the top surface of the support (2). The liner includes a first pressure plate (31) and a second pressure plate (32). The top surfaces of the first pressure plate (31) and the second pressure plate (32) are provided with load-bearing shafts (33). The two load-bearing shafts (33) are arranged close to the center of the support (2) and are symmetrically distributed. The first pressure plate (31) has a through hole. The first pressure plate (31) is slidably connected to one end of the support (2) in the length direction. The second pressure plate (32) is fixedly connected to the other end of the support (2). The clamping mechanism is located on one side of the loading unit along its length. The clamping mechanism includes a limiting frame (6) and a support rod (13). The support rod (13) is vertically arranged on the top surface of the test platform (1). The limiting frame (6) can slide along the axial direction of the support rod (13). The pressure device (11) can rotate and switch the orientation of the main loading shaft and the pressure block, such that one of the main loading shaft or the pressure block is located above the loading unit.
2. The cement mortar specimen strength testing system according to claim 1, characterized in that: The test platform (1) is also provided with a push plate (12), which is located on the side of the first pressure plate (31) away from the second pressure plate (32). The total length of the first pressure plate (31) and the second pressure plate (32) is greater than the length of the support (2).
3. The cement mortar specimen strength testing system according to claim 1, characterized in that: The first pressure plate (31) has a groove on the side facing the second pressure plate (32), and the second pressure plate (32) has a support block on the side near the first pressure plate (31) for engaging with the groove.
4. The cement mortar specimen strength testing system according to claim 1, characterized in that: The support (2) includes two symmetrically arranged first and second upright plates, the second upright plate being located below the second pressure plate (32), and a base plate (4) being slidably connected between the first and second upright plates.
5. The cement mortar specimen strength testing system according to claim 4, characterized in that: The first upright plate has a clearance groove extending along its thickness. The bottom surface of the first pressure plate (31) is connected to a positioning block (311). The positioning block (311) is located near the edge of the through hole. The longitudinal opening dimension of the clearance groove is larger than the longitudinal cross-sectional dimension of the positioning block (311).
6. The cement mortar specimen strength testing system according to claim 4, characterized in that: The test platform (1) has several threaded holes, and a screw (5) is threadedly connected to the threaded hole. A push block (51) is provided at the top of the screw (5). The top surface of the push block (51) is used to abut against the bottom surface of the base plate (4). A rotating sleeve (52) connected to the screw (5) is provided at the bottom of the push block (51).
7. The cement mortar specimen strength testing system according to claim 5, characterized in that: The thickness of the second upright plate is greater than that of the first upright plate, and the second upright plate has a through groove (21) along the thickness direction, with cleaning cloths provided on the upper and lower sides of the through groove (21).
8. The cement mortar specimen strength testing system according to claim 7, characterized in that: The limiting frame (6) includes a first clamping plate and a second clamping plate. The distance between the second clamping plate and the first clamping plate is adjustable. A fixing sleeve (7) is rotatably connected to the side of the first clamping plate away from the second pressure plate (32). The fixing sleeve (7) is slidably connected to the support rod (13). A cleaning cloth is also provided on the surfaces of the first clamping plate and the second clamping plate facing each other.
9. A method for testing the strength of cement mortar specimens, characterized in that, The strength of cement mortar specimens is tested using the testing system described in any one of claims 1-8, and flexural and compressive strength tests are performed using the loading unit and clamping mechanism, respectively.
10. The method for testing the strength of cement mortar specimens according to claim 9, characterized in that, Includes the following steps: S1. Pre-test preparation; including the fabrication of the test piece and the adjustment of the test system; S2, flexural strength test; S21. Adjust the load-bearing shafts (33) on the first pressure plate (31) and the second pressure plate (32) to be symmetrically distributed along the center of the support (2), and place the test piece on the two load-bearing shafts (33); S22. Adjust the main loading shaft of the pressure device (11) to press against the top surface of the test piece, adjust the parameters, and gradually apply pressure to the test piece; S23. The test piece is broken, resulting in two broken test pieces; S24. Record parameter information; S3, Compression test; S31. Send one of the broken specimens into the limiting frame (6); S32. Use screw (5) to adjust the bottom plate (4) to rise, while controlling the limit frame (6) to fall along the support rod (13); S33, control the push plate (12) to contact the first pressure plate (31) with the second pressure plate (32), and continue to adjust the bottom plate (4) to rise until the positioning block (311) and the bottom plate (4) are in contact and connected; S34. The broken specimen in the control limit frame (6) moves along the top of the bottom plate through the through groove of the second vertical plate until the broken specimen touches the positioning block (311); S35. Adjust and replace the pressure device (11), place the pressure head on the first pressure plate (31) and press it through the through hole onto the broken specimen to apply pressure; S36. The specimen breaks, and the test ends. S37. Record data.