Testing device for tensile strength of concrete

Abstract

The utility model relates to a device and a method for testing the tensile strength of concrete. The testing device comprises a test piece pouring mold, a base, a pressurizing machine, a pressing-pulling conversion device and a pressurizing control device, the testing method comprises the following steps: firstly, manufacturing a concrete test piece through the test piece pouring mold, then fixing the concrete test piece on the pressing-pulling conversion device, then pressurizing by using the pressurizing machine, and finally, calculating the real tensile strength of concrete by using the pressurizing control device. According to the testing device for the tensile strength of the concrete, the pressure applied by the pressurizing machine is converted into the tensile force borne by the concrete test piece through the pressing-pulling conversion device, and the testing device has the advantages of simple structure, convenience in operation and the like; the pressure control mechanism is used for recording the magnitude of the applied pressure when the concrete test piece is damaged, the real tensile strength of the concrete test piece is automatically calculated, and the method has the advantages of simple process, convenience in data calculation and the like.

Description

Technical field:

[0001] The utility model relates to the technical field of concrete, in particular to a testing device for the tensile strength of concrete. Background technology:

[0002] Concrete has abundant raw materials, low prices, and simple production processes, so its usage is increasing. At the same time, concrete has high compressive strength, good durability, and a wide range of strength grades, which makes its use very wide. It is not only used in various civil engineering projects, but also in shipbuilding, machinery industry, marine development, geothermal engineering, etc. Concrete is also an important material. The tensile strength of concrete refers to the ability of concrete to resist damage under tensile force. Concrete is a brittle material that is prone to cracks under tensile force. Once cracks appear, the strength of the concrete will decrease rapidly. Therefore, the tensile strength test of concrete is one of the important indicators for evaluating the quality of concrete.

[0003] There are two commonly used methods for testing the tensile strength of concrete, one is the tensile test method and the other is the indirect test method. In the tensile test, the concrete specimen is usually cylindrical or conical, and the length of the specimen is generally twice the diameter or height. The two ends of the specimen are fixed on the clamp of the tensile machine, and the tensile machine applies a tensile force until the concrete specimen is destroyed. According to the results of the tensile test, the tensile strength of the concrete can be calculated. The indirect test method indirectly calculates the tensile strength of the concrete by measuring other performance parameters of the concrete, such as compressive strength, elastic modulus, etc. However, the tensile test method tensile machine clamp is prone to torque on the specimen, and the indirect test method is prone to calculation errors. Both methods cannot obtain the true tensile strength of the concrete specimen. Therefore, how to obtain the true tensile strength of the concrete specimen has become a problem to be solved by technicians in this field. Utility model content:

[0004] In order to achieve the above-mentioned purpose of the utility model, the utility model discloses a testing device for the tensile strength of concrete. By installing a compression-tension conversion device, the pressure applied by a pressurizing machine is converted into the tension borne by the concrete specimen. The utility model has the advantages of simple structure and easy operation.

[0005] The technical solution adopted by the utility model is as follows:

[0006] A testing device for tensile strength of concrete, characterized in that it comprises: a specimen casting mold, a base, a pressurizing machine, a pressure-pull conversion device and a pressurizing control device; the lower platform of the base is fixedly connected to one end of the pressure-pull conversion device, the other end of the pressure-pull conversion device is fixedly connected to one end of the pressurizing machine, and the other end of the pressurizing machine is respectively connected to the upper cover of the base and the pressurizing control device; the pressure-pull conversion device comprises a movable bracket and a fixed bracket, the fixed bracket is connected to the lower platform of the base by bolts, the movable bracket is fixedly connected to the pressurizing machine, the pressurizing machine is connected to the upper cover of the base by bolts, and the central axis directions of the fixed bracket, the movable bracket and the pressurizing machine always coincide; the movable bracket comprises an upper movable assembly, a lower movable assembly and four The same rod I, the upper moving component and the lower moving component are respectively fixed at the two ends of the four same rods I; the fixed bracket includes an upper fixed component, a lower fixed component and four same rods II, the upper fixed component and the lower fixed component are respectively fixed at the two ends of the four same rods II; the concrete specimen is assembled between the mobile bracket and the fixed bracket, the upper fixed component of the fixed bracket can be disassembled to be assembled in the upper necking area of ​​the concrete specimen, and the lower moving component of the mobile bracket can be disassembled to be assembled in the lower necking area of ​​the concrete specimen; the fixed bracket is fixed, and the press drives the mobile bracket to move downward, thereby stretching the concrete specimen, and during the stretching process, the central axis directions of the fixed bracket, the mobile bracket and the press always coincide.

[0007] Further, it is characterized in that the base includes: a lower platform, an upper cover, a support frame I, a support frame II and two identical guide rails; the lower platform and the upper cover are respectively fixed at the bottom and the top of the two identical and parallel guide rails, the lower platform is connected to the lower fixed component of the fixed bracket by bolts, and the upper cover is connected to the press by bolts; one end of the support frame I is fixedly connected to the upper fixed component of the fixed bracket by bolts, and the other end is slidably connected to the guide rail, and one end of the support frame II is fixedly connected to the lower movable component of the movable bracket by bolts, and the other end is slidably connected to the guide rail.

[0008] Furthermore, it is characterized in that the specimen casting mold includes: a top cover, a bottom plate, a side plate I and a side plate II, and these four can form a closed mold frame for making the concrete specimen.

[0009] Furthermore, it is characterized in that it also includes a control system, which is placed inside the pressurization control device, and the coordinated operation of the entire device is controlled by the control system, and the true tensile strength of the concrete specimen is automatically calculated.

[0010] Furthermore, the testing method of the testing device for testing the tensile strength of concrete comprises the following steps:

[0011] S01. Making a concrete specimen by casting a specimen mold;

[0012] S02. Fix the concrete specimen on the compression-tension conversion device;

[0013] S03. Pressurizing using a pressurizing machine;

[0014] S04. The pressure control device calculates the true tensile strength of the concrete.

[0015] Furthermore, it is characterized in that said S01 comprises the following steps:

[0016] S011. Mix cement, aggregate, mineral admixture and water in a certain proportion to form a uniform paste material;

[0017] S012. The paste material is poured from the necking area of ​​the specimen casting mold to the entire mold; during the pouring process, the necking area should be filled continuously to avoid gaps or defects;

[0018] S013. Take out the air-dried concrete specimen from the specimen casting mold.

[0019] Furthermore, it is characterized in that said S02 comprises the following steps:

[0020] S021. Assembling the lower movable assembly of the movable support around the lower necking region of the concrete specimen;

[0021] S022. Assembling the upper fixing assembly of the fixed support around the upper necking region of the concrete specimen so that the central axis of the fixed support coincides with the central axis of the movable support;

[0022] S023. Finally, fix the compression-tension conversion device on the lower platform and make it coincide with the central axis direction of the press.

[0023] The beneficial effects of implementing the test device for concrete tensile strength of the utility model are:

[0024] (1) The utility model is a testing device for the tensile strength of concrete. By installing a compression-tension conversion device, the pressure applied by a pressurizing machine is converted into the tensile force borne by the concrete specimen. The utility model has the advantages of simple structure and convenient operation.

[0025] (2) The utility model is a testing device for the tensile strength of concrete. The pressure applied when the concrete specimen is broken is recorded by a pressure control mechanism, and the real tensile strength of the concrete specimen is automatically calculated. The utility model has the advantages of simple process and convenient data calculation. Description of the drawings:

[0026] Figure 1 This is a three-dimensional structural diagram of a testing device for tensile strength of concrete according to the utility model;

[0027] Figure 2 This is a structural diagram of a compression-tension conversion device for testing the tensile strength of concrete in the utility model;

[0028] Figure 3 The utility model is a mobile bracket for a test device for tensile strength of concrete;

[0029] Figure 4 This is a fixing bracket of a testing device for concrete tensile strength of the utility model;

[0030] Figure 5 This is a structural diagram of a specimen casting mold for a test device for concrete tensile strength of the utility model;

[0031] In the figure: 1- compression-pull conversion device, 11- movable bracket, 12- fixed bracket, 13- upper movable assembly, 14- lower movable assembly, 15- rod I, 16- upper fixed assembly, 17- lower fixed assembly, 18- rod II, 21- lower platform, 22- guide rail, 23- upper top cover, 24- support frame I, 25- support frame II, 31- concrete specimen, 32- top cover, 33- bottom plate, 34- side plate I, 35- side plate II, 41- pressurizing machine, 51- pressurizing control device. Specific implementation method:

[0032] The following is a further description of a testing device for concrete tensile strength of the utility model in conjunction with the accompanying drawings:

[0033] like Figure 1 , 2As shown in Figures 3, 4 and 5, the utility model is a testing device for tensile strength of concrete, characterized in that it comprises: a specimen casting mold, a base, a pressurizing machine 41, a compression-tension conversion device 1 and a pressurizing control device 51; the lower platform 21 of the base is fixedly connected to one end of the compression-tension conversion device 1, the other end of the compression-tension conversion device 1 is fixedly connected to one end of the pressurizing machine 41, and the other end of the pressurizing machine 41 is respectively connected to the upper cover 23 of the base and the pressurizing control device 51; the compression-tension conversion device 1 comprises a movable bracket 11 and a fixed bracket 12, the fixed bracket 12 is connected to the lower platform 21 of the base by bolts, the movable bracket 11 is fixedly connected to the pressurizing machine 41, the pressurizing machine 41 is connected to the upper cover 23 of the base by bolts, and the central axis directions of the fixed bracket 12, the movable bracket 11 and the pressurizing machine 41 always coincide with each other; the movable bracket 11 comprises an upper movable assembly 13, a lower movable assembly 14 and four identical rods I15, the upper moving component 13 and the lower moving component 14 are respectively fixed at the two ends of the four identical rods I15; the fixed bracket 12 includes an upper fixing component 16, a lower fixing component 17 and four identical rods II18, the upper fixing component 16 and the lower fixing component 17 are respectively fixed at the two ends of the four identical rods II18; the concrete specimen 31 is assembled between the moving bracket 11 and the fixed bracket 12, the upper fixing component 16 of the fixed bracket 12 can be disassembled to be assembled in the upper necking area of ​​the concrete specimen 31, and the lower moving component 14 of the moving bracket 11 can be disassembled to be assembled in the lower necking area of ​​the concrete specimen 31; the fixed bracket 12 is fixed, and the press 41 drives the moving bracket 11 to move downward, thereby stretching the concrete specimen 31, and during the stretching process, the central axis directions of the fixed bracket 12, the moving bracket 11 and the press 41 always coincide.

[0034] Furthermore, the base includes: a lower platform 21, an upper cover 23, a support frame I24, a support frame II25 and two identical guide rails 22; the lower platform 21 and the upper cover 23 are respectively fixed below and above the two identical and parallel guide rails 22, the lower platform 21 is connected to the lower fixed component 17 of the fixed bracket 12 by bolts, and the upper cover 23 is connected to the press 41 by bolts; one end of the support frame I24 is fixedly connected to the upper fixed component 16 of the fixed bracket 12 by bolts, and the other end is slidably connected to the guide rail 22, one end of the support frame II25 is fixedly connected to the lower movable component 14 of the movable bracket 11 by bolts, and the other end is slidably connected to the guide rail 22.

[0035] Furthermore, the specimen casting mold includes: a top cover 32, a bottom plate 33, a side plate I34 and a side plate II35, and these four can form a closed mold frame for making the concrete specimen 31.

[0036] Furthermore, it also includes a control system, which is placed inside the pressurization control device 51 , and controls the coordinated operation of the entire device, and automatically calculates the true tensile strength of the concrete specimen 31 .

[0037] like Figure 1 , 2 As shown in , 3, 4, and 5, the working principle of the test device for tensile strength of concrete of the utility model is as follows:

[0038] The upper fixed component 16 of the fixed bracket 12 is disassembled and assembled in the upper necking area of ​​the concrete specimen 31. The lower movable component 14 of the movable bracket 11 is disassembled and assembled in the lower necking area of ​​the concrete specimen 31; the lower fixed component 17 of the fixed bracket 12 is connected to the lower platform 21 of the base by bolts, and the upper movable component 13 of the movable bracket 11 is fixedly connected to one end of the press 41 by bolts. During the connection process, the central axis directions of the fixed bracket 12, the movable bracket 11 and the press 41 are always kept coincident; one end of the support frame I24 is fixedly connected to the upper fixed component 16 of the fixed bracket 12 by bolts, and the other end is slidably connected to the guide rail 22. The support frame II One end of 25 is fixedly connected to the lower moving component 14 of the moving bracket 11 by bolts, and the other end is slidably connected to the guide rail 22 to ensure that during the stretching process, the central axis directions of the fixed bracket 12, the moving bracket 11 and the pressurizing machine 41 always coincide with each other; the test device is started, and the control system controls the coordinated operation of the entire device, the fixed bracket 12 is fixed, and the pressurizing machine 41 drives the moving bracket 11 to move downward, thereby stretching the concrete specimen 31, and during the stretching process, the central axis directions of the fixed bracket 12, the moving bracket 11 and the pressurizing machine 41 always coincide with each other, and when the concrete specimen 31 is tensilely fractured, the pressurizing control device 51 will automatically calculate the true tensile strength of the concrete specimen 31.

[0039] The utility model discloses a testing method for a testing device for concrete tensile strength, comprising the following steps:

[0040] S01. Making concrete specimens 31 by casting the specimen mold;

[0041] S02. The concrete specimen 31 is fixed on the compression-tension conversion device 1;

[0042] S03. Pressurizing using a pressurizing machine 41;

[0043] S04. The pressurization control device 51 calculates the true tensile strength of the concrete.

[0044] Furthermore, the S01 comprises the following steps:

[0045] S011. Mix cement, aggregate, mineral admixture and water in a certain proportion to form a uniform paste material;

[0046] S012. The paste material is poured from the necking area of ​​the specimen casting mold to the entire mold; during the pouring process, the necking area should be filled continuously to avoid gaps or defects;

[0047] S013. Take out the air-dried concrete specimen 31 from the specimen casting mold.

[0048] Furthermore, the S02 comprises the following steps:

[0049] S021. The lower movable assembly 14 of the movable bracket 11 is assembled around the lower necking region of the concrete specimen 31;

[0050] S022. Assemble the upper fixing assembly 16 of the fixed bracket 12 around the upper necking region of the concrete specimen 31 so that the central axis of the fixed bracket 12 coincides with the central axis of the movable bracket 11;

[0051] S023. Finally, fix the compression-tension conversion device 1 on the lower platform 21 and make it coincide with the central axis direction of the press 41.

[0052] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A testing device for tensile strength of concrete, characterized in that: include: A specimen casting mold, a base, a pressurizing machine (41), a compression-tension conversion device (1) and a pressurizing control device (51); The lower platform (21) of the base is fixedly connected to one end of the compression-pull conversion device (1), the other end of the compression-pull conversion device (1) is fixedly connected to one end of the press (41), and the other end of the press (41) is respectively connected to the upper cover (23) of the base and the pressurizing control device (51); the compression-pull conversion device (1) comprises a movable bracket (11) and a fixed bracket (12), and the fixed bracket (12) is connected to the lower platform (21) of the base by bolts. The movable bracket (11) is fixedly connected to the press (41), and the press (41) is connected to the top cover (23) on the base by bolts. The central axis directions of the fixed bracket (12), the movable bracket (11) and the press (41) always coincide with each other. The movable bracket (11) comprises an upper movable assembly (13), a lower movable assembly (14) and four identical rods I (15). The upper movable assembly (13) and the lower movable assembly (14) are respectively fixed on four identical rods. The fixed bracket (12) comprises an upper fixing assembly (16), a lower fixing assembly (17) and four identical bars II (18), wherein the upper fixing assembly (16) and the lower fixing assembly (17) are respectively fixed at the two ends of the four identical bars II (18); the concrete specimen (31) is assembled between the mobile bracket (11) and the fixed bracket (12), and the upper fixing assembly (16) of the fixed bracket (12) can be disassembled to be assembled in the The upper necking area of ​​the concrete specimen (31) is provided, and the lower movable assembly (14) of the movable bracket (11) can be disassembled so as to be assembled in the lower necking area of ​​the concrete specimen (31); the fixed bracket (12) is fixed, and the press (41) drives the movable bracket (11) to move downward, thereby stretching the concrete specimen (31); and during the stretching process, the central axis directions of the fixed bracket (12), the movable bracket (11) and the press (41) always coincide with each other.

2. A testing device for tensile strength of concrete as claimed in claim 1, characterized in that: The base comprises: a lower platform (21), an upper cover (23), a support frame I (24), a support frame II (25) and two identical guide rails (22); the lower platform (21) and the upper cover (23) are respectively fixed below and above the two identical and parallel guide rails (22); the lower platform (21) is connected to the lower fixed component (17) of the fixed bracket (12) by bolts, and the upper cover (23) is connected to the press (41) by bolts; one end of the support frame I (24) is fixedly connected to the upper fixed component (16) of the fixed bracket (12) by bolts, and the other end is slidably connected to the guide rail (22); one end of the support frame II (25) is fixedly connected to the lower movable component (14) of the movable bracket (11) by bolts, and the other end is slidably connected to the guide rail (22).

3. A testing device for tensile strength of concrete as claimed in claim 1, characterized in that: The specimen casting mold comprises: a top cover (32), a bottom plate (33), a side plate I (34) and a side plate II (35), which can form a closed mold frame for making the concrete specimen (31).

4. A testing device for tensile strength of concrete as claimed in claim 1, characterized in that: It also comprises a control system, which is placed inside the pressurizing control device (51), and controls the coordinated operation of the entire device and automatically calculates the true tensile strength of the concrete specimen (31).

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