Concrete durability test loading device

Abstract

The invention belongs to the technical field of concrete tests, and discloses a concrete durability test loading device which comprises a freeze-thaw test bin assembly, a load loading arm assembly is arranged at the top of the freeze-thaw test bin assembly, and a plurality of concrete test pieces are subjected to synchronous load loading through the load loading arm assembly. The anti-deflection arm assembly is arranged on one side of the freezing and thawing test bin assembly, and a centering and position correcting structure for a plurality of concrete test pieces is formed between a plurality of first anti-deflection arms and a plurality of second anti-deflection arms, so that a plurality of load loading tables and a plurality of concrete test pieces are centered, and force unbalance loading of the subsequent load loading tables during loading of the concrete test pieces is avoided; the other side of the freezing and thawing test bin assembly is provided with the bin expanding arm assembly, and the bin expanding piston moves outwards in the end auxiliary bin, so that the bin bodies at the two ends of the test bin body form a structure with the volume capable of being increased, and static ice pressure on a concrete test piece when the ice volume in the freezing and thawing test bin assembly is expanded is eliminated.

Description

Technical Field

[0001] This invention belongs to the field of concrete testing technology, and specifically relates to a concrete durability testing loading device. Background Technology

[0002] Concrete, as one of the most widely used materials in construction engineering, directly affects the safety and service life of structures due to its long-term durability. In concrete durability testing, the freeze-thaw cycle test is a crucial method for evaluating the frost resistance of concrete in cold environments. Traditional freeze-thaw testing devices typically employ a single-specimen loading method, which suffers from low testing efficiency and poor data consistency. Furthermore, when multiple specimens are loaded simultaneously, uneven loading forces can easily occur due to specimen position deviations or asymmetry in the loading device, affecting the accuracy of the test results.

[0003] In existing technologies, some testing devices attempt to achieve synchronous loading of multiple specimens through mechanical structures, but they often lack effective centering and correction mechanisms, making it difficult to ensure that each specimen experiences consistent stress. On the other hand, during freeze-thaw tests, the volume expansion of water upon freezing generates static ice pressure on the specimens. This additional stress can interfere with test results and even lead to abnormal specimen failure. Currently common freeze-thaw chamber structures are fixed and cannot adapt to volume changes during freezing, thus making it difficult to eliminate the influence of static ice pressure.

[0004] Therefore, there is an urgent need to develop a concrete durability test loading device that can achieve synchronous and uniform loading of multiple specimens, has a self-correcting position function, and can effectively eliminate static ice pressure during freeze-thaw cycles. Summary of the Invention

[0005] To address the problems mentioned in the background section, this invention provides a concrete durability testing loading device with the characteristic of synchronous and uniform loading.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a concrete durability test loading device, comprising a freeze-thaw test chamber assembly, wherein a load loading arm assembly is provided on the top of the freeze-thaw test chamber assembly, and multiple concrete specimens are synchronously loaded through the load loading arm assembly. By alternating cooling and heating inside the freeze-thaw test chamber assembly, a freeze-thaw cycle test chamber structure is formed inside the freeze-thaw test chamber assembly. An anti-deviation arm assembly is provided on one side of the freeze-thaw test chamber assembly, which corrects the position of multiple concrete specimens to avoid force deviation of the load loading arm assembly during load loading. An expansion arm assembly is provided on the other side of the freeze-thaw test chamber assembly. At low temperatures, the displacement of the expansion arm assembly increases the chamber volume of the freeze-thaw test chamber assembly, thereby eliminating the static ice pressure on the concrete specimens when the ice volume inside the freeze-thaw test chamber assembly expands.

[0007] In a preferred embodiment of a concrete durability testing loading device, the freeze-thaw test chamber assembly includes a test chamber body. A first side slide seat, a temperature probe, and a second side arm are fixedly mounted on one side of the test chamber body. A second motor is mounted at the bottom of the second side arm, and a telescopic hydraulic cylinder is fixedly mounted at the top of the second side arm. A second gear is mounted on the output shaft of the second motor. The first side slide seat and the temperature probe are both located at both ends of the test chamber body. A cooling element, a heating rod, and a chamber base are mounted at the bottom of the test chamber body. End auxiliary chambers and end slides are fixedly mounted at both ends of the test chamber body. A second side slide seat and a first side arm are fixedly mounted on the other side of the test chamber body. A telescopic hydraulic cylinder is fixedly mounted at the top of the first side arm, and a first motor is fixedly mounted at the bottom of the first side arm. A first gear is mounted on the output shaft of the first motor.

[0008] In a preferred embodiment of a concrete durability test loading device, the freeze-thaw test chamber assembly further includes a chamber cover. A hydraulic cylinder and a vertical arm plate are provided at one end of the top of the chamber cover, and a through seat groove is provided in the middle of the top of the chamber cover. The bottom of the hydraulic cylinder is rotatably mounted on the top of the chamber cover, and the hydraulic cylinder is located between two vertical arm plates. The top of the chamber cover is fixedly connected to the output rod arm of the telescopic hydraulic cylinder.

[0009] In a preferred embodiment of a concrete durability test loading device, the test chamber base forms a suspended structure at the bottom of the test chamber, and the cooling element and heating rod are both installed within this suspended structure. The bottom of the test chamber is also equipped with a water inlet pipe and a water outlet pipe with valves.

[0010] In a preferred embodiment of a concrete durability test loading device, the load loading arm assembly includes a drive arm and a central arm platform. A fork arm is fixedly mounted at one end of the central arm platform, and a push arm is fixedly mounted at the other end of the central arm platform. A toggle arm is fixedly mounted at the top of the drive arm, and a support base arm platform is fixedly mounted at the bottom of the drive arm. Multiple rotating shaft grooves are opened at the bottom of the support base arm platform, and a rotating shaft platform is rotatably mounted in the rotating shaft grooves through bearings. A load loading platform is fixedly mounted at the bottom of the rotating shaft platform.

[0011] In a preferred embodiment of a concrete durability test loading device, the anti-deviation arm assembly includes a first toothed arm and a second toothed arm. A first toothed sliding rod is fixedly mounted on the first toothed arm, and a plurality of first anti-deviation arms are fixedly mounted on the first toothed sliding rod. A second toothed sliding rod is fixedly mounted on the second toothed arm, and a plurality of second anti-deviation arms are fixedly mounted on the second toothed sliding rod.

[0012] In a preferred embodiment of a concrete durability test loading device, the expansion arm assembly includes a first expansion toothed arm and a second expansion toothed arm, both of which are fixedly provided with expansion sliding arms, and the distal end of the expansion sliding arm is fixedly provided with an expansion piston.

[0013] In a preferred embodiment of a concrete durability test loading device, the drive arm slides through the top of the silo cover via a through seat groove, the support base arm is located inside the silo cover, the toggle arm and the center arm are both located on the top of the silo cover, the center arm is rotatably mounted on two vertical arm plates via a shaft and bearing, the top of the hydraulic cylinder is rotatably connected to the push arm, and the fork arm is inserted on the toggle arm.

[0014] In a preferred embodiment of a concrete durability test loading device, both the second toothed sliding rod and the first toothed sliding rod slide through the end grooves and slide through both ends of the silo cover. At this time, the rear end rods of the first toothed arm and the second toothed arm are slidably disposed in the second side groove seat. The first toothed arm and the second toothed arm are disposed at the top and bottom of the first gear. At this time, the top of the first gear meshes with the first toothed arm, and the bottom of the first gear meshes with the second toothed arm. The multiple first anti-deviation arms and the multiple second anti-deviation arms form a centering and alignment structure for multiple concrete specimens.

[0015] In a preferred embodiment of a concrete durability test loading device, the expansion sliding arm slides within a first side slide groove seat, and the first expansion toothed arm and the second expansion toothed arm are respectively disposed at the top and bottom of a second gear. At this time, the top of the second gear meshes with the first expansion toothed arm, and the bottom of the second gear meshes with the second expansion toothed arm, and the expansion piston slides within the end auxiliary chamber.

[0016] Compared with the prior art, the beneficial effects of the present invention are: 1. The freeze-thaw test chamber assembly of the present invention is provided with a load loading arm assembly at the top. Multiple concrete specimens are synchronously loaded by the load loading arm assembly. Multiple concrete specimens are placed at the bottom of the test chamber. At this time, the hydraulic cylinder pushes the push arm upward. At this time, the fork arm pushes the drive arm downward by moving the cross arm. At this time, the support frame arm platform drives multiple load loading platforms to abut against multiple concrete specimens, realizing the synchronous and equal force test loading of multiple concrete specimens.

[0017] 2. The freeze-thaw test chamber assembly of the present invention is provided with an anti-eccentricity arm assembly on one side. The anti-eccentricity arm assembly corrects the position of multiple concrete specimens and avoids the force imbalance of the load loading arm assembly when the load is applied. The first motor drives the first gear to rotate clockwise. When the first gear rotates clockwise, the first gear will drive the second toothed sliding rod and the first toothed sliding rod to slide synchronously out of the test chamber body through the first toothed moving arm and the second toothed moving arm. In this process, the multiple first anti-eccentricity arms and the multiple second anti-eccentricity arms form a centering and alignment structure for the multiple concrete specimens, so that the multiple load loading platforms and the multiple concrete specimens are aligned, avoiding the force imbalance of the load loading platform when the concrete specimens are loaded.

[0018] 3. This invention creates a freeze-thaw cycle test chamber structure by alternating cooling and heating inside the freeze-thaw test chamber assembly. Specifically, during the test, water is added to the test chamber, immersing the concrete specimen in water. At this time, the heating rod and cooling plate are alternately activated to create a freeze-thaw cycle test chamber environment. The freeze-thaw test chamber assembly of this invention is provided with an expansion arm assembly on the other side. By moving the expansion piston outward in the end auxiliary chamber, the two chambers of the test chamber form a structure that can increase in volume. Through this structure, the volume of the test chamber is increased, thereby eliminating the static ice pressure on the concrete specimen when the ice volume expands inside the freeze-thaw test chamber assembly. Attached Figure Description

[0019] Figure 1 This is a perspective view of the present invention; Figure 2 This is an exploded view of the present invention; Figure 3 This is a perspective view of the freeze-thaw test chamber assembly of the present invention; Figure 4 This is a perspective view of the freeze-thaw test chamber component of the present invention from another angle; Figure 5 This is a perspective view of the load-loading arm assembly of the present invention; Figure 6 This is a perspective view of the anti-deviation arm assembly of the present invention; Figure 7 This is a perspective view of the expansion arm assembly of the present invention.

[0020] In the diagram: 100, Freeze-thaw test chamber assembly; 101, Chamber cover; 102, Hydraulic cylinder; 103, Vertical arm plate; 104, Through-slot; 105, Telescopic hydraulic cylinder; 106, First side arm; 107, First motor; 108, First gear; 109, Test chamber body; 110, Chamber base; 111, Second side slide seat; 112, End slide; 113, End auxiliary chamber; 114, Second side arm; 115, Second motor; 116, Second gear; 117, Heating rod; 118, Cooling element; 119, Temperature probe; 120, First side slide seat; 200, Loading arm assembly. Components; 201, Drive boom; 202, Actuating crossarm; 203, Fork arm; 204, Center boom platform; 205, Pushing arm; 206, Rotating shaft platform; 207, Rotating shaft groove; 208, Load loading platform; 209, Support base frame boom platform; 300, Anti-deviation arm assembly; 301, First toothed boom; 302, First toothed sliding rod; 303, First anti-deviation arm; 304, Second toothed boom; 305, Second toothed sliding rod; 306, Second anti-deviation arm; 400, Expansion arm assembly; 401, First expansion toothed arm; 402, Second expansion toothed arm; 403, Expansion sliding arm; 404, Expansion piston. Detailed Implementation

[0021] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0022] Please see Figures 1-7 As shown, the present invention provides a concrete durability test loading device, including a freeze-thaw test chamber assembly 100. A load loading arm assembly 200 is provided on the top of the freeze-thaw test chamber assembly 100. Multiple concrete specimens are synchronously loaded through the load loading arm assembly 200. By alternating cooling and heating inside the freeze-thaw test chamber assembly 100, a freeze-thaw cycle test chamber structure is formed inside the freeze-thaw test chamber assembly 100. An anti-deviation arm assembly 300 is provided on one side of the freeze-thaw test chamber assembly 100. The anti-deviation arm assembly 300 is used to correct the position of multiple concrete specimens and avoid the load loading arm assembly 200 from being unbalanced during load loading. An expansion arm assembly 400 is provided on the other side of the freeze-thaw test chamber assembly 100. At low temperatures, the displacement of the expansion arm assembly 400 increases the volume of the freeze-thaw test chamber assembly 100, thereby eliminating the static ice pressure on the concrete specimens when the volume of ice inside the freeze-thaw test chamber assembly 100 expands.

[0023] In a preferred embodiment, please refer to Figure 3 and Figure 4 The freeze-thaw test chamber assembly 100 includes a test chamber body 109. A first side slide seat 120, a temperature probe 119, and a second side arm 114 are fixedly mounted on one side of the test chamber body 109. A second motor 115 is mounted at the bottom of the second side arm 114, and a telescopic hydraulic cylinder 105 is fixedly mounted at the top of the second side arm 114. A second gear 116 is mounted on the output shaft of the second motor 115. The first side slide seat 120 and the temperature probe 119 are both located at both ends of the test chamber body 109. A cooling element 118, a heating rod 117, and a chamber base 110 are located at the bottom of the test chamber body 109. End auxiliary chambers 113 and end slides 112 are fixedly mounted at both ends of the test chamber body 109. On the other side, a second side slide seat 111 and a first side arm 106 are fixedly installed. A telescopic hydraulic cylinder 105 is fixedly installed on the top of the first side arm 106, and a first motor 107 is fixedly installed on the bottom of the first side arm 106. A first gear 108 is installed on the output shaft of the first motor 107. The freeze-thaw test chamber assembly 100 also includes a chamber cover 101. A hydraulic cylinder 102 and a vertical arm plate 103 are installed at one end of the top of the chamber cover 101. A through seat groove 104 is opened in the middle of the top of the chamber cover 101. The bottom of the hydraulic cylinder 102 is rotatably installed on the top of the chamber cover 101. The hydraulic cylinder 102 is located between the two vertical arm plates 103. The top of the chamber cover 101 is fixedly connected to the output rod arm of the telescopic hydraulic cylinder 105.

[0024] In this embodiment, the base 110 causes the bottom of the test chamber 109 to form a suspended structure.

[0025] In this embodiment, both the cooling element 118 and the heating rod 117 are disposed within this suspended structure.

[0026] In this embodiment, the bottom of the test chamber 109 is also equipped with a water inlet pipe and a drain pipe with valves.

[0027] In a preferred embodiment, please refer to Figure 5 The load loading arm assembly 200 includes a drive arm 201 and a central arm platform 204. A fork arm 203 is fixedly installed at one end of the central arm platform 204, and a push arm 205 is fixedly installed at the other end of the central arm platform 204. A toggle arm 202 is fixedly installed at the top of the drive arm 201, and a support base arm platform 209 is fixedly installed at the bottom of the drive arm 201. Multiple rotating shaft grooves 207 are opened at the bottom of the support base arm platform 209. A rotating shaft platform 206 is rotatably installed in the rotating shaft grooves 207 through bearings. A load loading platform 208 is fixedly installed at the bottom of the rotating shaft platform 206.

[0028] In this embodiment, the drive arm 201 slides through the through seat groove 104 and through the top of the cover 101.

[0029] In this embodiment, the support frame arm 209 is located inside the bin cover 101.

[0030] In this embodiment, both the toggle arm 202 and the center arm platform 204 are located on top of the compartment cover 101.

[0031] In this embodiment, the central arm platform 204 is rotatably mounted on two vertical arm plates 103 via shafts and bearings.

[0032] In this embodiment, the top of the hydraulic cylinder 102 is rotatably connected to the push arm 205.

[0033] In this embodiment, the fork arm 203 is inserted into the toggle arm 202.

[0034] In a preferred embodiment, please refer to Figure 6 The anti-deviation arm assembly 300 includes a first toothed arm 301 and a second toothed arm 304. A first toothed sliding rod 302 is fixedly mounted on the first toothed arm 301, and a plurality of first anti-deviation arms 303 are fixedly mounted on the first toothed sliding rod 302. A second toothed sliding rod 305 is fixedly mounted on the second toothed arm 304, and a plurality of second anti-deviation arms 306 are fixedly mounted on the second toothed sliding rod 305.

[0035] In this embodiment, both the second toothed sliding rod 305 and the first toothed sliding rod 302 slide through the end grooves 112 and slide through both ends of the cover 101.

[0036] In this embodiment, the rear end rods of the first toothed arm 301 and the second toothed arm 304 are both slidably disposed within the second side slide seat 111.

[0037] In this embodiment, the first toothed arm 301 and the second toothed arm 304 are disposed at the top and bottom of the first gear 108.

[0038] In this embodiment, the top of the first gear 108 meshes with the first toothed arm 301, and the bottom of the first gear 108 meshes with the second toothed arm 304.

[0039] In this embodiment, a centering and alignment structure for multiple concrete specimens is formed between multiple first anti-deviation arms 303 and multiple second anti-deviation arms 306.

[0040] In a preferred embodiment, please refer to Figure 7 The expansion arm assembly 400 includes a first expansion gear arm 401 and a second expansion gear arm 402. An expansion sliding arm 403 is fixedly provided on both the first expansion gear arm 401 and the second expansion gear arm 402. An expansion piston 404 is fixedly provided at the far end of the expansion sliding arm 403.

[0041] In this embodiment, the expansion sliding arm 403 slides within the first side slide seat 120.

[0042] In this embodiment, the first expansion gear arm 401 and the second expansion gear arm 402 are respectively disposed at the top and bottom of the second gear 116.

[0043] In this embodiment, the top of the second gear 116 meshes with the first expansion gear arm 401, and the bottom of the second gear 116 meshes with the second expansion gear arm 402.

[0044] In this embodiment, the expansion piston 404 slides within the end auxiliary chamber 113.

[0045] The working principle of this invention is as follows: Existing concrete durability testing loading devices mostly perform individual loading tests on single concrete specimens, which significantly reduces testing efficiency due to the inability to test multiple specimens simultaneously. Furthermore, when loading multiple concrete specimens, it cannot be ensured that the loading force is the same for each specimen, leading to deviations in the test data. To overcome these problems, the freeze-thaw test chamber assembly 100 of this invention is equipped with a load loading arm assembly 200 at its top. The load loading arm assembly 200 performs synchronous load loading on multiple concrete specimens. Specifically, the load loading arm assembly 200 includes a drive arm 201 and a central arm platform 204. A fork arm 203 is fixedly mounted at one end of the central arm platform 204, and a push arm 205 is fixedly mounted at the other end. A toggle arm 202 is fixedly mounted at the top of the drive arm 201, and a support frame arm platform 209 is fixedly mounted at the bottom of the drive arm 201. Multiple rotating shaft grooves 207 are formed at the bottom of the support frame arm platform 209. A rotating shaft platform 206 is rotatably mounted within the rotating shaft groove 207 via bearings. A load loading platform 208 is fixedly mounted at the bottom of the rotating shaft platform 206. The drive arm 201 slides through the through seat groove 104 and the top of the bin cover 101. The supporting frame arm platform 209 is located inside the bin cover 101. The paving arm 202 and the center arm platform 204 are both located on the top of the bin cover 101. At this time, the center arm platform 204 is rotatably mounted on the two vertical arm plates 103 via shafts and bearings. The top of the hydraulic cylinder 102 is connected to the push arm. 205 is rotatably connected, and the fork arm 203 is inserted into the lever arm 202. In actual use, multiple concrete specimens are placed at the bottom of the test chamber 109. At this time, the hydraulic cylinder 102 pushes the push arm 205 upward, and the fork arm 203 pushes the drive arm 201 downward through the lever arm 202. At this time, the support frame arm platform 209 drives multiple load loading platforms 208 to abut against multiple concrete specimens. In this way, the test loading of multiple concrete specimens with the same force is achieved.

[0046] Based on the above, to avoid force imbalance when the load loading arm assembly 200 applies the same force to multiple concrete specimens simultaneously, an anti-eccentricity arm assembly 300 is provided on one side of the freeze-thaw test chamber assembly 100 of the present invention. The anti-eccentricity arm assembly 300 corrects the position of multiple concrete specimens, preventing force imbalance during load loading. Specifically, the second toothed sliding rod 305 and the first toothed sliding rod 302 both slide through the end grooves 112 to both ends of the chamber cover 101. At this time, the rear ends of the first toothed sliding arm 301 and the second toothed sliding arm 304 are slidably disposed within the second side groove seat 111. The first toothed sliding arm 301 and the second toothed sliding arm 304 are disposed at the top and bottom of the first gear 108, respectively. The top of the first gear 108 meshes with the first toothed sliding arm 301, and the bottom of the first gear 108 meshes with the second toothed sliding arm 304. A centering and alignment structure for multiple concrete specimens is formed between the first anti-deviation arm 303 and multiple second anti-deviation arms 306. In actual use, the first motor 107 drives the first gear 108 to rotate clockwise. When the first gear 108 rotates clockwise, it drives the second toothed sliding rod 305 and the first toothed sliding rod 302 to slide synchronously outward from the test chamber 109 through the first toothed moving arm 301 and the second toothed moving arm 304. During this process, the multiple first anti-deviation arms 303 and multiple second anti-deviation arms 306 form a centering and alignment structure for multiple concrete specimens. Through this structure, multiple concrete specimens are centered and positioned below multiple load loading platforms 208. In this way, the multiple load loading platforms 208 and multiple concrete specimens are aligned, avoiding force deviation of the load loading platforms 208 when loading the concrete specimens.

[0047] Based on the above, in order to enhance the testing of concrete specimens under freeze-thaw conditions, this invention creates a freeze-thaw cycle test chamber structure inside the freeze-thaw test chamber assembly 100 by alternating cooling and heating inside the chamber. Specifically, during the test, water is added to the test chamber 109, immersing the concrete specimen in the water. The heating rod 117 and cooling element 118 are alternately activated to create a freeze-thaw cycle test chamber environment inside the chamber 109. To avoid static ice pressure on the concrete specimen due to the increased volume of the frozen liquid during freezing tests, an expansion arm assembly 400 is provided on the other side of the freeze-thaw test chamber assembly 100. At low temperatures, the displacement of the expansion arm assembly 400 increases the volume of the freeze-thaw test chamber assembly 100, thereby eliminating the static ice pressure on the concrete specimen caused by the expansion of the frozen volume inside the freeze-thaw test chamber assembly 100. Specifically, the expansion sliding arm 403 is located on the first side sliding groove seat 1. The first expansion gear 401 and the second expansion gear 402 are respectively located at the top and bottom of the second gear 116. At this time, the top of the second gear 116 meshes with the first expansion gear 401, and the bottom of the second gear 116 meshes with the second expansion gear 402. The expansion piston 404 slides in the end auxiliary chamber 113. In actual use, during the freezing test, the second motor 115 drives the second gear 116 to rotate. At this time, the second gear 116 meshes with the first expansion gear 401 and the second expansion gear 402, causing the expansion piston 404 to move outward in the end auxiliary chamber 113. At this time, the outward movement of the expansion piston 404 in the end auxiliary chamber 113 makes the two chambers of the test chamber 109 form a structure that can increase in volume. Through this structure, the volume of the test chamber 109 is increased. In this way, the static ice pressure on the concrete specimen when the volume of ice in the freeze-thaw test chamber assembly 100 expands is eliminated.

[0048] It should be noted that, in order to ensure the vertical movement of the load loading arm assembly 200 on the freeze-thaw test chamber assembly 100, both the through seat groove 104 and the drive arm rod 201 of the present invention are designed as square structures.

[0049] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A concrete durability test loading device comprising a freeze-thaw test chamber assembly (100), characterized by: The freeze-thaw test bin assembly (100) is provided with a load loading arm assembly (200) at the top, which synchronously loads multiple concrete test pieces, and forms a freeze-thaw cycle test bin structure inside the freeze-thaw test bin assembly (100) by alternating refrigeration and heating inside the freeze-thaw test bin assembly (100). The freeze-thaw test bin assembly (100) is provided with a deviation prevention arm assembly (300) on one side, which corrects the position of multiple concrete test pieces to avoid the deviation of the load loading arm assembly (200) when loading. The freeze-thaw test bin assembly (100) is provided with an expansion bin arm assembly (400) on the other side, which expands the volume of the freeze-thaw test bin assembly (100) by displacement at low temperature, thereby eliminating the static ice pressure on the concrete test piece when the ice volume in the freeze-thaw test bin assembly (100) expands.

2. The concrete durability test loading device according to claim 1, characterized in that: The freeze-thaw test bin assembly (100) comprises a test bin body (109), a first side chute seat (120), a temperature probe (119) and a second side arm (114) are fixedly arranged on one side of the test bin body (109), a second motor (115) is arranged at the bottom of the second side arm (114), and a telescopic hydraulic cylinder (105) is fixedly arranged at the top of the second side arm (114). A second gear (116) is arranged on the output shaft of the second motor (115). The first side chute seat (120) and the temperature probe (119) are arranged at both ends of the test bin body (109). A refrigeration fin (118), a heating rod (117) and a bin base (110) are arranged at the bottom of the test bin body (109). End auxiliary bins (113) and end chutes (112) are fixedly arranged at both ends of the test bin body (109). A second side chute seat (111) and a first side arm (106) are fixedly arranged on the other side of the test bin body (109). The first side arm (106) is fixedly provided with a telescopic hydraulic cylinder (105) at the top and a first motor (107) at the bottom. A first gear (108) is arranged on the output shaft of the first motor (107).

3. The concrete durability test loading device of claim 2, wherein: The freeze-thaw test bin assembly (100) further comprises a bin cover (101), one end of the top of the bin cover (101) is provided with a hydraulic cylinder (102) and a vertical arm plate (103), and a through seat groove (104) is formed in the middle of the top of the bin cover (101). The bottom of the hydraulic cylinder (102) is rotatably arranged on the top of the bin cover (101), and the hydraulic cylinder (102) is located between the two vertical arm plates (103). The top of the bin cover (101) is fixedly connected with the output rod arm of the telescopic hydraulic cylinder (105).

4. The concrete durability test loading device of claim 3, wherein: The bin base (110) forms a suspended structure at the bottom of the test bin body (109), and the refrigeration fin (118) and the heating rod (117) are arranged in the suspended structure. The test bin body (109) is further provided with a water inlet pipe and a drain pipe with a valve.

5. The concrete durability test loading device of claim 4, wherein: The load loading arm assembly (200) comprises a driving arm rod (201) and a center arm table (204), one end of the center arm table (204) is fixedly provided with a fork arm (203), and the other end of the center arm table (204) is fixedly provided with a pushing arm (205), the top of the driving arm rod (201) is fixedly provided with a dialing cross arm (202), the bottom of the driving arm rod (201) is fixedly provided with a supporting chassis arm table (209), a plurality of rotating shaft grooves (207) are formed in the bottom end of the supporting chassis arm table (209), rotating shaft tables (206) are rotatably arranged in the rotating shaft grooves (207) through bearings, and load loading tables (208) are fixedly arranged at the bottom of the rotating shaft tables (206).

6. The concrete durability test loading device of claim 5, wherein: The anti-deviation arm assembly (300) comprises a first toothed arm (301) and a second toothed arm (304), the first toothed arm (301) is fixedly provided with a first toothed sliding rod (302), a plurality of first anti-deviation arms (303) are fixedly arranged on the first toothed sliding rod (302), the second toothed arm (304) is fixedly provided with a second toothed sliding rod (305), and a plurality of second anti-deviation arms (306) are fixedly arranged on the second toothed sliding rod (305).

7. The concrete durability test loading device of claim 6, wherein: The expansion arm assembly (400) comprises a first expansion toothed arm (401) and a second expansion toothed arm (402), the first expansion toothed arm (401) and the second expansion toothed arm (402) are both fixedly provided with expansion sliding arms (403), and expansion pistons (404) are fixedly arranged at the distal ends of the expansion sliding arms (403).

8. The concrete durability test loading device of claim 7, wherein: The driving arm rod (201) penetrates and slides through the top of the cover (101) through the penetrating seat groove (104), the supporting chassis arm table (209) is located inside the cover (101), the dialing cross arm (202) and the center arm table (204) are both located on the top of the cover (101), at this time, the center arm table (204) is rotatably arranged on the two vertical arm plates (103) through a shaft rod and a bearing, the hydraulic cylinder (102) is rotatably connected with the pushing arm (205) at the top, and the fork arm (203) is inserted on the dialing cross arm (202).

9. The concrete durability test loading device of claim 8, wherein: The second toothed sliding rod (305) and the first toothed sliding rod (302) both penetrate and slide through the two ends of the cover (101) through end sliding grooves (112), at this time, the rear rod bodies of the first toothed arm (301) and the second toothed arm (304) are both slidably arranged in the second side sliding groove seat (111), the first toothed arm (301) and the second toothed arm (304) are arranged on the top and the bottom of the first gear (108), at this time, the first gear (108) is meshed with the first toothed arm (301) at the top, and the first gear (108) is meshed with the second toothed arm (304) at the bottom, and the centering alignment structure of the plurality of concrete test pieces is formed between the plurality of first anti-deviation arms (303) and the plurality of second anti-deviation arms (306).

10. The concrete durability test loading device of claim 9, wherein: The expansion sliding arm (403) slides in the first side sliding groove seat (120), the first expansion tooth arm (401) and the second expansion tooth arm (402) are arranged at the top and the bottom of the second gear (116) respectively, at this time, the top of the second gear (116) is engaged with the first expansion tooth arm (401), and the bottom of the second gear (116) is engaged with the second expansion tooth arm (402), and the expansion piston (404) slides in the end auxiliary bin (113).

Images