CN-121977938-A - Concrete durability test device under load and freeze thawing cycle coupling

CN121977938ACN 121977938 ACN121977938 ACN 121977938ACN-121977938-A

Abstract

The invention discloses a concrete durability test device under load and freeze thawing cycle coupling, which comprises a machine body bearing frame, wherein an axial loading structure is arranged in the machine body bearing frame, a lateral loading structure is arranged in the axial loading structure, lateral loading structures are arranged at the upper end and the lower end of the axial loading structure, the machine body bearing frame comprises a bottom plate arranged at the bottom end of equipment, and a longitudinal bearing frame is fixedly arranged at the upper end of the bottom plate. According to the concrete durability test device under the coupling of the load and the freeze thawing cycle, the lateral loading structure is arranged, the high-concentration sodium chloride solution is used as a medium when the concrete is axially loaded, and the solution is driven to enter the pressurizing cavity through the movement of the piston ring, so that the elastic diaphragm is expanded and uniform pressure is applied to the side surface of the concrete test block, the omnidirectional load simulation of the concrete test block is realized, and the service environment of the concrete in the actual engineering structure for bearing the multidirectional stress is more truly reproduced.

Inventors

WU LIMING
GAO FENG
LING LING
LIU GUANGNA
WANG YUE
Huang Huxintong
WU JIANPING
ZHANG KAIJUN
NIE HUAN

Assignees

重庆开放大学重庆工商职业学院

Dates

Publication Date: 20260505
Application Date: 20260109

Claims (9)

1. The concrete durability test device under the coupling of the load and the freeze thawing cycle is characterized by comprising a machine body bearing frame (1), wherein an axial loading structure (2) is arranged in the machine body bearing frame (1), a lateral loading structure (3) is arranged in the axial loading structure (2), and a circulating soaking structure (4) is arranged at the upper end and the lower end of the axial loading structure (2); the machine body bearing frame (1) comprises a bottom plate (5) arranged at the bottom end of the machine, a longitudinal bearing frame (6) is fixedly arranged at the upper end of the bottom plate (5), an electric telescopic pump (7) is fixedly arranged at the upper end of the longitudinal bearing frame (6), and a telescopic rod (8) is arranged at the output end of the electric telescopic pump (7) in a transmission manner.
2. The device for testing the durability of the concrete under the coupling of the load and the freeze thawing cycle according to claim 1, wherein the lateral loading structure (3) comprises a connecting frame (9) which is arranged on the surface of a longitudinal bearing frame (6) in a sliding manner, an external protective cover (10) is fixedly connected to the inside of the connecting frame (9), and a load chamber (11) is fixedly connected to the inside of the external protective cover (10).
3. The device for testing the durability of concrete under the coupling of load and freeze thawing cycle according to claim 2, wherein the load chamber (11) and the middle part of the external shield (10) form a storage chamber, and the inside of the chamber is stored with a high-concentration sodium chloride solution.
4. The device for testing the durability of the concrete under the coupling of the load and the freeze thawing cycle according to claim 3, wherein the surface of the load chamber (11) is provided with through holes (12) in an annular array, the through holes (12) are formed in the storage chamber, an elastic diaphragm (16) is fixedly connected in the load chamber (11), a pressurizing chamber is formed between the load chamber (11) and the elastic diaphragm (16), and the storage chamber and the pressurizing chamber are communicated through the through holes (12).
5. The device for testing the durability of the concrete under the coupling of the load and the freeze thawing cycle according to claim 4, wherein a piston ring (13) is slidably arranged in the storage chamber, a fixing rod (14) is fixedly connected to the top surface of the bottom plate (5), one end of the fixing rod (14), which is far away from the bottom plate (5), is fixedly connected to the bottom surface of the piston ring (13), the outer protection cover (10) is slidably arranged on the surface of the fixing rod (14), a first spring (15) is sleeved on the surface of the fixing rod (14), and two ends of the first spring (15) are fixedly connected with the bottom plate (5) and the outer protection cover (10) respectively.
6. The device for testing the durability of the concrete under the coupling of the load and the freeze thawing cycle according to claim 5, wherein a positioning seat (17) is fixedly connected to the inside of the load chamber (11), a cement block (18) is arranged in the positioning seat (17), and an axial loading structure (2) is arranged at the upper end of the cement block (18).
7. The device for testing the durability of the concrete under the coupling of the load and the freeze thawing cycle according to claim 6, wherein the axial loading structure (2) comprises a top cover (28) fixedly arranged at the bottom end of the telescopic rod (8), the top end of the load chamber (11) is fixedly connected with a closed loop (27), and the top cover (28) is clamped inside the closed loop (27).
8. The device for testing the durability of the concrete under the coupling of the load and the freeze thawing cycle according to claim 7, wherein a guide rod (19) is slidably arranged in the top cover (28), a top limiting block (20) is fixedly connected to the top end of the guide rod (19), a pressing plate (21) is fixedly connected to one end, far away from the top limiting block (20), of the guide rod (19), the pressing plate (21) is arranged at the top end of the cement block (18), a second spring (22) is sleeved on the surface of the guide rod (19), and two ends of the axial loading structure (2) are fixedly connected with the pressing plate (21) and the top cover (28).
9. The device for testing the durability of the concrete under the coupling of the load and the freeze thawing cycle according to claim 8, wherein the top surface of the top cover (28) is fixedly connected with a weak water inlet pipe (23), the surface of the weak water inlet pipe (23) is fixedly connected with a first electromagnetic valve (24), the bottom end of the load chamber (11) is fixedly connected with a drain pipe (25), and the surface of the drain pipe (25) is fixedly connected with a second electromagnetic valve (26).

Description

Concrete durability test device under load and freeze thawing cycle coupling Technical Field The invention relates to the technical field of concrete performance test, in particular to a concrete durability test device under load and freeze thawing cycle coupling. Background The durability test of the concrete under the coupling of the load and the freeze thawing cycle is an acceleration test method for simulating the actual service conditions of the concrete structure in severe environments such as severe cold, salty, and the like. The test is carried out by applying freeze-thawing cycle to concrete specimen under continuous or alternating mechanical load by special device to couple double damage effects of mechanics and freeze-thawing damage. The device comprises a concrete load freeze-thawing cycle coupling device, a concrete strain testing system and a freeze-thawing testing machine, wherein the concrete load freeze-thawing cycle coupling device is placed in the freeze-thawing testing machine for freeze-thawing cycle coupling test, sample strain data are recorded in real time through the concrete strain testing system, and the durability of the concrete is evaluated through parameters such as strain change rate, mass change rate and the like after a test sample is subjected to load and freeze-thawing cycle coupling action for a certain number of times. The method can rapidly test and evaluate the durability of the load-holding concrete (member) in the severe cold region, accurately simulate the coupling effect of the load and the freeze thawing cycle in actual service, and is simple in operation, scientific and effective. Provides technical support for durability design and material selection of large-scale engineering structures under severe cold and other complex service conditions. In summary, the prior art has the technical problems that the device can simulate the durability of circulating freeze thawing when concrete is loaded by longitudinally applying pressure to the concrete and then performing a freeze thawing cycle experiment on the concrete, and the device can only axially apply pressure to a concrete test block but cannot apply pressure to the side surface of the test block, so that the device cannot simulate the complex working condition of coupling omnidirectional load and freeze thawing cycle, which can possibly be born by the concrete in an actual service environment, and therefore, the device for testing the durability of the concrete under coupling of the load and the freeze thawing cycle needs to be provided, so as to solve the technical problems mentioned in the patent. Disclosure of Invention Based on the above, it is necessary to provide a concrete durability test device under the coupling of load and freeze thawing cycle, aiming at the problems in the background art. In order to solve the technical problems, the invention adopts the following technical scheme: And a concrete durability test device under the coupling of load and freeze thawing cycle. The concrete durability test device under the coupling of the load and the freeze thawing cycle specifically comprises a machine body bearing frame, wherein an axial loading structure is arranged in the machine body bearing frame, a lateral loading structure is arranged in the axial loading structure, and a circulating soaking structure is arranged at the upper end and the lower end of the axial loading structure; The machine body bearing frame comprises a bottom plate arranged at the bottom end of the equipment, a longitudinal bearing frame is fixedly arranged at the upper end of the bottom plate, an electric telescopic pump is fixedly arranged at the upper end of the longitudinal bearing frame, and a telescopic rod is arranged at the output end of the electric telescopic pump in a transmission manner. As the preferred implementation mode of the concrete durability test device under the coupling of the load and the freeze thawing cycle, the lateral loading structure comprises a connecting frame which is arranged on the surface of a longitudinal bearing frame in a sliding manner, an external protective cover is fixedly connected to the inside of the connecting frame, and a load chamber is fixedly connected to the inside of the external protective cover. As a preferred embodiment of the concrete durability test device under the coupling of the load and the freeze thawing cycle, the load chamber and the middle part of the external protective cover form a storage chamber, and the inside of the storage chamber is stored with a high-concentration sodium chloride solution. As the preferred implementation mode of the concrete durability test device under the coupling of the load and the freeze thawing cycle, the surface of the load chamber is provided with the through holes in an annular array, the through holes are arranged in the storage chamber, the elastic diaphragm is fixedly connected in the load chamber, a pressurizing chamber is form