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CN-122016482-A - Cement mortar test piece strength testing system and testing method

CN122016482ACN 122016482 ACN122016482 ACN 122016482ACN-122016482-A

Abstract

The invention relates to the technical field of strength test of cement mortar test pieces, in particular to a system and a method for testing the strength of a cement mortar test piece, and aims to solve the problem that a cement test piece in the prior art cannot be subjected to fracture resistance and compression resistance tests rapidly and continuously. The test platform is provided with pressure equipment for providing displacement application load, the loading unit comprises a support seat, a first pressing plate and a second pressing plate, the support seat is arranged below a main loading shaft, the top surfaces of the first pressing plate and the second pressing plate are respectively provided with a bearing shaft, the clamping mechanism comprises a limiting frame and a supporting rod, the limiting frame can slide along the supporting rod, and the pressure equipment can rotate and switch the directions of the main loading shaft and the pressing block so that one of the main loading shaft or the pressing block is located above the loading unit. The loading unit and the clamping mechanism can realize that the bending test and the compression test are carried out under the same equipment, so that eccentric errors caused by secondary carrying of the test piece are avoided, the continuity between the bending test and the compression test is improved, the consistency of the loading direction is ensured, and the data comparability is improved.

Inventors

  • LI YUANZHE
  • Hu Linshou
  • YU WEIXIAO
  • LUO HUIFANG

Assignees

  • 四川省公路规划勘察设计研究院有限公司

Dates

Publication Date
20260512
Application Date
20260409

Claims (10)

  1. 1. The utility model provides a cement mortar test piece intensity test system which characterized in that includes: The test device comprises a test platform (1), wherein a pressure device (11) is arranged on the test platform (1), a main loading shaft and a pressing block are arranged on the pressure device (11), and the main loading shaft and the pressing block are used for providing displacement application load downwards on the same axis; The loading unit comprises a support (2) and a lining plate, wherein the support is positioned below the main loading shaft, the lining plate is positioned on the top surface of the support (2), the lining plate comprises a first pressing plate (31) and a second pressing plate (32), the top surfaces of the first pressing plate (31) and the second pressing plate (32) are respectively provided with a bearing shaft (33), the two bearing shafts (33) are close to the center of the support (2) and are symmetrically distributed, through holes are formed in the first pressing plate (31), the first pressing plate (31) is slidably connected to one end of the support (2) in the length direction, and the second pressing plate (32) is fixedly connected to the other end of the support (2); The clamping mechanism is positioned at one side of the length direction of the loading unit and comprises a limiting frame (6) and a supporting rod (13), the supporting rod (13) is vertically arranged on the top surface of the test platform (1), and the limiting frame (6) can slide along the axial direction of the supporting rod (13); Wherein the pressure device (11) is rotatable and switches the orientation of the main loading shaft and the press block such that one of the main loading shaft or press block is located above the loading unit.
  2. 2. The cement mortar test piece strength testing system according to claim 1, wherein a pushing plate (12) is further arranged on the testing platform (1), the pushing plate (12) is located on one side, away from the second pressing plate (32), of the first pressing plate (31), and the total length of the first pressing plate (31) and the second pressing plate (32) is larger than that of the support (2).
  3. 3. The cement mortar test piece strength testing system according to claim 1, wherein a groove is formed in one side of the first pressing plate (31) facing the second pressing plate (32), and a supporting block used for being clamped with the groove is arranged on one side, close to the first pressing plate (31), of the second pressing plate (32).
  4. 4. The cement mortar test piece strength testing system according to claim 1, wherein the support (2) comprises two first vertical plates and two second vertical plates which are symmetrically arranged, the second vertical plates are positioned below the second pressing plate (32), and a bottom plate (4) is connected between the first vertical plates and the second vertical plates in a sliding mode.
  5. 5. The cement mortar test piece strength testing system according to claim 4, wherein the first vertical plate is provided with an avoidance groove in a penetrating mode along the thickness direction, the bottom surface of the first pressing plate (31) is connected with a positioning block (311), the positioning block (311) is arranged close to the edge of the through hole, and the longitudinal opening size of the avoidance groove is larger than the longitudinal section size of the positioning block (311).
  6. 6. The cement mortar test piece strength test system according to claim 4, wherein the test platform (1) is provided with a plurality of threaded holes, threaded holes are internally connected with screws (5), the top ends of the screws (5) are provided with push blocks (51), the top surfaces of the push blocks (51) are used for abutting against the bottom surface of the bottom plate (4), and the bottom of the push blocks (51) is provided with a rotary sleeve (52) connected with the screws (5).
  7. 7. The cement mortar test piece strength test system according to claim 5, wherein the thickness of the second vertical plate is larger than that of the first vertical plate, through grooves (21) are formed in the second vertical plate along the thickness direction, and cleaning cloth is arranged on the upper side and the lower side of each through groove (21).
  8. 8. The cement mortar test piece strength testing system according to claim 7, wherein the limiting frame (6) comprises a first clamping plate and a second clamping plate, the distance between the second clamping plate and the first clamping plate is adjustable, one side, far away from the second clamping plate (32), of the first clamping plate is rotatably connected with a fixing sleeve (7), the fixing sleeve (7) is slidably connected onto the supporting rod (13), and cleaning cloth is arranged on the mutually facing surfaces of the first clamping plate and the second clamping plate.
  9. 9. A method for testing the strength of a cement mortar test piece, which is characterized in that the strength of the cement mortar test piece is tested based on the testing system according to any one of claims 1 to 8, and a flexural test and a compressive test are respectively carried out by using a loading unit and a clamping mechanism.
  10. 10. The method for testing the strength of the cement mortar test piece according to claim 9, comprising the following steps: s1, preparing before testing, wherein the preparation comprises the manufacturing of a test piece to be tested and the adjustment of a testing system; S2, bending test; S21, adjusting bearing shafts (33) on the first pressing plate (31) and the second pressing plate (32) to be symmetrically distributed along the center of the support (2), and placing a test piece to be tested on the two bearing shafts (33); S22, the main loading shaft of the pressure adjusting device (11) is abutted against the top surface of the test piece to be tested, parameters are adjusted, and pressure is gradually applied to the test piece to be tested; s23, breaking the test piece to be tested to obtain two broken test pieces; S24, recording parameter information; S3, compression test; s31, sending one of the broken test pieces into a limiting frame (6); S32, adjusting the bottom plate (4) to ascend by utilizing the screw rod (5), and simultaneously controlling the limit frame (6) to fall along the support rod (13); s33, controlling the push plate (12) to contact the first pressing plate (31) with the second pressing plate (32), and continuously adjusting the bottom plate (4) to rise until the positioning block (311) is in abutting connection with the bottom plate (4); s34, controlling the broken test piece in the limit frame (6) to pass through the through groove of the second vertical plate and move above the bottom plate until the broken test piece touches the positioning block (311); S35, adjusting a replacement pressure device (11), placing a pressure head on the first pressure plate (31) and pressing the pressure head to the broken test piece through the through hole, and applying pressure; s36, breaking the broken test piece, and ending the test; s37, recording data.

Description

Cement mortar test piece strength testing system and testing method Technical Field The invention relates to the technical field of cement mortar test piece strength test, in particular to a cement mortar test piece strength test system and a test method. Background Cement mortar strength is an important index for evaluating cement and related cementitious material properties. The current strength test method generally adopts a standard-sized test piece to carry out a flexural test and a compressive test so as to respectively determine the flexural strength and the compressive strength of the material. Taking a conventional standard method as an example, performing a three-point bending fracture test on a test piece, obtaining two half test pieces after fracture resistance, and performing compression tests on the half test pieces respectively. In the existing test flow, the bending test and the compression test are generally finished step by step on the same testing machine or different testing equipment. After the fracture resistance is finished, an operator needs to take out the broken half test piece, clean loose particles or dust on the fracture surface, and load the broken half test piece between an upper pressing plate and a lower pressing plate of the compression resistance device. The compression test generally adopts a uniaxial unconfined compression mode, axial load is applied only through an upper pressing plate and a lower pressing plate, and the side surface of the test piece is in a free expansion state so as to determine the maximum bearing capacity of the test piece before crushing or unstability. The conventional method has established a mature operation standard in long-term application, but has a plurality of defects in the actual detection process, namely, firstly, a test piece transferring and repositioning process exists between a bending test and a compression test. The broken half test piece needs to be manually carried, turned over and put again, attitude deviation and centering error are easy to introduce, consistency of the compression loading axis and the geometric center of the test piece is affected, so that test result discreteness is increased, and consistency of the compression results is possibly affected by time difference. Secondly, dust, loose particles and irregular protrusions are usually present on the broken end face of the test piece after fracture resistance and damage. If the test piece is not cleaned properly, point contact or uneven contact can be formed between the pressing plate and the test piece, so that local stress concentration is caused, and accurate measurement of compression limiting load is affected. Therefore, it is necessary to propose an improved technical solution capable of completing the fracture and compression test in the same test system, reducing the test piece transfer error, improving the contact state of the broken end face and improving the test consistency. Disclosure of Invention The invention aims to provide a cement mortar test piece strength test system and a test method, which are used for solving the problems. The first aspect of the invention is realized by the following technical scheme: A cement mortar test piece strength testing system, comprising: The test platform is provided with a pressure device, the pressure device is provided with a main loading shaft and a pressing block, and the main loading shaft and the pressing block are used for providing displacement application load downwards on the same axis; The loading unit comprises a support and a lining plate, wherein the support and the lining plate are positioned below the main loading shaft, the lining plate is positioned on the top surface of the support, the lining plate comprises a first pressing plate and a second pressing plate, the top surfaces of the first pressing plate and the second pressing plate are respectively provided with a bearing shaft, the two bearing shafts are close to the center of the support and are symmetrically distributed, the first pressing plate is provided with a through hole, the first pressing plate is slidably connected with one end of the support in the length direction, and the second pressing plate is fixedly connected with the other end of the support; The clamping mechanism is positioned at one side of the length direction of the loading unit and comprises a limiting frame and a supporting rod, the supporting rod is vertically arranged on the top surface of the test platform, and the limiting frame can slide along the axial direction of the supporting rod; Wherein the pressure device is rotatable and switches the orientation of the main loading shaft and the press block such that one of the main loading shaft or the press block is located above the loading unit. According to the technical scheme, the bending test and the compression test are performed under the same equipment, eccentric errors caused by secondary carrying of the tes