A split fixture for rapid chloride ion migration coefficient test

Abstract

The utility model relates to chloride ion migration coefficient test technical field especially relates to a kind of splitting fixture for fast chloride ion migration coefficient test, including parallelly arranged upper frame plate and lower frame plate, support assembly and limiting component are set on lower frame plate, and lower pressure component is set on upper frame plate corresponding support assembly. Lower pressure component includes bearing plate, guide column and fixed plate, bearing plate and fixed plate are respectively set in guide column length both ends;Guide column vertically penetrates upper frame plate and is slidably connected with it, and fixed plate is set in guide column one end close to support assembly, and there is ram on fixed plate. Concrete test piece penetration surface faces down, back surface is towards ram, and its projection center and ram coincide, so that concrete test piece is bent back splitting under the action of ram, isolated test surface and stress area in operating process, avoid to destroy test surface, and static fracturing concrete test piece, can reduce microcrack propagation, ensure test accuracy.

Description

Technical Field

[0001] This utility model relates to the field of chloride ion migration coefficient testing technology, and in particular to a splitting fixture for rapid chloride ion migration coefficient testing. Background Technology

[0002] Chloride ions are a major contributing factor to the corrosion and accelerated rust expansion of steel reinforcement in reinforced concrete structures. In reinforced concrete structures, concrete not only works in conjunction with steel reinforcement to provide structural performance, but its crucial role is to protect the steel reinforcement and delay the intrusion of chloride ions from the external environment, thus inhibiting corrosion. Therefore, improving the chloride ion penetration resistance of concrete is of great significance from the perspective of enhancing the durability of reinforced concrete structures.

[0003] The Rapid Chloride Ion Migration Coefficient (RCM) method accelerates the penetration of chloride ions into concrete through electromigration, measures the penetration depth, and calculates the chloride ion migration coefficient to evaluate the concrete's resistance to chloride ion penetration. Therefore, the accuracy of the chloride ion penetration depth test directly affects the migration coefficient test results. According to the test standard, after the electromigration test, the specimen must be axially split into two semi-cylinders on a pressure testing machine, with the split surface used as the test surface, and AgNO3 solution colorimetric indicator immediately sprayed on it.

[0004] Since the RCM test uses a cylindrical specimen with a diameter of (100±1) mm and a height of (50±2) mm, the current test generally adopts the contact splitting method, that is, using a sharp steel blade to split the specimen, with the blade in direct contact with the specimen. The advantage of this method is that the splitting position is controllable, the stress concentration is in the directly stressed area, and after exceeding a certain strength, the concrete cracks, and the location is basically near the point of action of the splitting blade.

[0005] However, this method, where the blade directly presses against the concrete specimen, can cause localized damage to the contact area, and for concrete with lower strength, it may even lead to significant deformation. This damage provides additional penetration channels for the AgNO3 solution used for subsequent color development (as well as the chloride-containing salt solution in the experiment), adversely affecting the acquisition of accurate chloride ion penetration depth and migration coefficient results. Utility Model Content

[0006] The purpose of this invention is to provide a specimen splitting fixture that does not damage the test surface, addressing the shortcomings of existing technologies.

[0007] To achieve the above objectives, the technical solution adopted by this utility model is as follows: A splitting fixture for rapid chloride ion migration coefficient testing includes a mounting bracket and a pressing component, a supporting component, and a limiting component disposed thereon; The mounting bracket includes an upper frame plate and a lower frame plate arranged in parallel, and the upper frame plate and the lower frame plate are fixedly connected by frame columns arranged around them. The support component and the limiting component are disposed on the lower frame plate, and the pressing component is disposed on the upper frame plate corresponding to the support component.

[0008] Furthermore, the pressing assembly includes a pressure plate, a guide post, and a fixing plate, wherein the pressure plate and the fixing plate are respectively disposed at both ends of the guide post; The guide post vertically penetrates the upper frame plate and is slidably connected to it. The fixing plate is located at one end of the guide post near the support assembly, and a pressure head is provided on the fixing plate.

[0009] Furthermore, the fixing plate is connected to the upper frame plate via a return spring.

[0010] Furthermore, the support assembly includes two support rollers arranged parallel to each other on the lower frame plate. The support rollers are arranged parallel to the length direction of the pressure head, and the two support rollers are symmetrically arranged on both sides of the pressure head.

[0011] Furthermore, the spacing between the two support rollers is set to be between 50mm and 86mm.

[0012] Furthermore, both the pressure head and the support roller are configured as steel cylinders.

[0013] Furthermore, the diameter of the pressure head and the support roller is set to (10.0±0.1) mm.

[0014] Furthermore, the limiting component includes two limiting posts disposed on the lower frame plate.

[0015] The beneficial effects of this utility model are as follows: In this application, the concrete specimen is placed with the permeable surface facing down and the back side facing the pressure head, causing the concrete specimen to split in a back-bending manner under the action of the pressure head. During the operation, the test surface is isolated from the stress zone to avoid damaging the test surface. At the same time, this application controls the distance between the two support rollers, which can ensure that the location of the fracture surface of the specimen under bending is basically located near the center of the specimen, which is close to the existing methods and will not have an adverse effect on subsequent tests. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is a schematic diagram of the splitting fixture used for rapid chloride ion migration coefficient testing in this utility model; Figure 2 This is a top view of the concrete specimen placed on the splitting fixture in this utility model.

[0018] 1. Mounting bracket; 11. Upper frame plate; 12. Lower frame plate; 13. Frame column; 2. Lower pressing assembly; 21. Bearing plate; 22. Guide column; 23. Fixing plate; 24. Press head; 25. Return spring; 3. Support assembly; 31. Support roller; 4. Limiting assembly; 41. Limiting column. Detailed Implementation

[0019] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0020] It should be noted that when an element is referred to as being "fixed to" another element, it can be directly attached to the other element or there may be an intervening element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or there may be an intervening element. The terms "vertical," "horizontal," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only possible implementation.

[0021] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0022] like Figure 1 and Figure 2 A splitting fixture for rapid chloride ion migration coefficient testing is shown, comprising a mounting bracket 1 and a pressing component 2, a support component 3, and a limiting component 4 disposed thereon; the mounting bracket 1 includes an upper frame plate 11 and a lower frame plate 12 arranged in parallel, the upper frame plate 11 and the lower frame plate 12 being fixedly connected by frame columns 13 disposed around it; the support component 3 and the limiting component 4 are disposed on the lower frame plate 12, and the pressing component 2 is disposed on the upper frame plate 11 corresponding to the support component 3.

[0023] The pressing component 2 includes a pressure plate 21, a guide post 22, and a fixing plate 23. The pressure plate 21 and the fixing plate 23 are respectively disposed at both ends of the guide post 22. The guide post 22 vertically penetrates the upper frame plate 11 and is slidably connected to it. The fixing plate 23 is disposed at one end of the guide post 22 near the support component 3, and a pressure head 24 is disposed on the fixing plate 23. The limiting component 4 includes two limiting posts 41 disposed on the lower frame plate 12.

[0024] In the specific implementation process, the end face of the concrete specimen that has been permeated with chloride ions is placed face down on the support component 3. The concrete specimen is tangent to the two limiting columns 41. Under the action of the limiting columns 41, the center of the projection circle of the concrete specimen coincides with the pressure head 24 to ensure the splitting symmetry. The driving press acts on the bearing plate 21 and is transmitted to the pressure head 24 of the fixed plate 23 through the guide column 22, and finally acts on the back of the concrete specimen.

[0025] like Figure 2 As shown, the concrete specimen is tangent to the two limiting posts 105, with L1 being (50.0±0.5)mm. The two support rollers 104 are set in parallel and parallel to the outer edge of the lower frame plate. The distance L2 from the support rollers 104 to the center O of the concrete specimen is 25mm~43mm.

[0026] Furthermore, the support assembly 3 includes two support rollers 31 arranged parallel to each other on the lower frame plate 12. The support rollers 31 are arranged parallel to the length direction of the pressure head 24, and the two support rollers 31 are symmetrically arranged on both sides of the pressure head 24.

[0027] The concrete specimen is placed with the permeable surface facing down and the back side facing the pressure head 24, causing the concrete specimen to split in a back-bending manner under the action of the pressure head 24. During the operation, the test surface is isolated from the stress zone to avoid damaging the test surface. Furthermore, the spacing between the two support rollers 31 is controlled to ensure that the location of the cracked section under bending is basically located near the center of the specimen, which is similar to existing methods and will not have an adverse effect on subsequent tests.

[0028] In this embodiment, the fixing plate 23 is connected to the upper frame plate 11 via a return spring 25. After the pressing component 2 completes the splitting operation driven by the pressure gauge, it can automatically return to its original position under the action of the spring.

[0029] In this embodiment, both the pressure head 24 and the support roller 31 are made of steel cylinders, and the diameter of the pressure head 24 and the support roller 31 is set to (10.0±0.1) mm. The distance between the two support rollers 31 is set to 50 mm to 86 mm.

[0030] Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed utility model. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. A splitting fixture for rapid chloride ion migration coefficient testing, characterized in that, It includes a mounting bracket (1) and a pressing component (2), a support component (3), and a limiting component (4) mounted thereon; The mounting bracket (1) includes an upper frame plate (11) and a lower frame plate (12) arranged in parallel, and the upper frame plate (11) and the lower frame plate (12) are fixedly connected by frame columns (13) arranged around them. The support component (3) and the limiting component (4) are disposed on the lower frame plate (12), and the pressing component (2) is disposed on the upper frame plate (11) corresponding to the support component (3).

2. The splitting fixture for rapid chloride ion migration coefficient testing according to claim 1, characterized in that, The pressing assembly (2) includes a pressure plate (21), a guide post (22) and a fixing plate (23), wherein the pressure plate (21) and the fixing plate (23) are respectively disposed at both ends of the length of the guide post (22); The guide post (22) vertically penetrates the upper frame plate (11) and is slidably connected to it. The fixing plate (23) is located at one end of the guide post (22) near the support assembly (3). A pressure head (24) is provided on the fixing plate (23).

3. The splitting fixture for rapid chloride ion migration coefficient testing according to claim 2, characterized in that, The fixing plate (23) is connected to the upper frame plate (11) by a return spring (25).

4. The splitting fixture for rapid chloride ion migration coefficient testing according to claim 2, characterized in that, The support assembly (3) includes two support rollers (31) arranged parallel to each other on the lower frame plate (12). The support rollers (31) are arranged parallel to the length direction of the pressure head (24), and the two support rollers (31) are symmetrically arranged on both sides of the pressure head (24).

5. The splitting fixture for rapid chloride ion migration coefficient testing according to claim 4, characterized in that, The spacing between the two support rollers (31) is set to 50mm~86mm.

6. The splitting fixture for rapid chloride ion migration coefficient testing according to claim 4, characterized in that, Both the pressure head (24) and the support roller (31) are made of steel cylinders.

7. The splitting fixture for rapid chloride ion migration coefficient testing according to claim 6, characterized in that, The diameter of the pressure head (24) and the support roller (31) is set to (10.0±0.1) mm.

8. The splitting fixture for rapid chloride ion migration coefficient testing according to claim 2, characterized in that, The limiting component (4) includes two limiting posts (41) disposed on the lower frame plate (12).

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