Early crack resistance test device for concrete

Abstract

The utility model belongs to the technical field of concrete performance testing, and particularly relates to a concrete early-stage crack resistance testing device. A concrete early-stage crack resistance test device comprises a main box body, the main box body is of a front-back hollow shell structure, a box body left-right layering plate and a box body upper-lower layering plate which are perpendicular to each other are arranged in the main box body, and the interior of the main box body is averagely divided into a left upper layer area, a right upper layer area, a left lower layer area and a right lower layer area; a plurality of anti-cracking test mold roller pulley blocks are arranged at the bottom of each layer of area, concrete anti-cracking test molds are arranged on the upper portions of the anti-cracking test mold roller pulley blocks, an infrared sensor, a fan fixing rod, a test area fan and a test area fan door are arranged on the side wall of the top of each layer of area, and a control mechanism is arranged on the side wall of the main box body. According to the utility model, layering and partitioning are carried out in the test box, so that a plurality of groups of test pieces can be simultaneously supported for testing, the influence of environmental factors on test results is eliminated, and the anti-cracking test precision is improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of concrete performance testing, in particular to a concrete early anti-cracking test device. Background Art

[0002] Cracking has always been one of the problems faced by concrete engineering. Engineering research shows that about 80% of the cracks in concrete structures are not caused by insufficient bearing capacity, but by non-load stress generated by concrete materials under the influence of changes in environmental temperature and humidity. The technical measures commonly used in modern construction, such as high-strength and early-strength cement, increased cement dosage, and low water-cement ratio, have exacerbated this phenomenon. Cracking will shorten the service life of concrete structures and reduce the durability of concrete structures. In the process of concrete structure construction, evaluating the crack resistance of materials and using it as the basis for design, construction and raw material selection to effectively ensure that the structure meets the specified service life requirements in different service environments has become a hot issue in the current research field of concrete materials and engineering.

[0003] At present, most early crack resistance tests of concrete are conducted by the flat plate method. The existing test methods have some defects: (1) The national standard and industry standard only make requirements for the test mold, and do not specify the specific test instruments, such as the size and height of the test fan, which may cause test errors. (2) The standard requires the test results to be evaluated by the average value of two or more specimens. However, the existing test equipment can only complete the test of one specimen at a time. The early crack resistance test of concrete is highly sensitive to the ambient temperature and humidity and test conditions. The results of early crack resistance tests of concrete conducted at different times are often quite different. (3) At present, most early crack resistance tests of concrete are comparative tests, the purpose of which is to optimize the benchmark concrete mix ratio by using anti-cracking materials such as mineral admixtures, admixtures, and fibers. If the benchmark group and the comparison group cannot be tested at the same time, the slight difference in test conditions will also greatly affect the effect evaluation. Utility Model Content

[0004] In view of the above problems, the purpose of the utility model is to provide a concrete early crack resistance testing device, which can support multiple groups of test pieces for testing at the same time by layering and zoning in the test box, eliminate the influence of environmental factors on the test results, and improve the accuracy of the crack resistance test.

[0005] The technical solution of the utility model is: a concrete early crack resistance test device, comprising a main box body, the main box body is a shell structure with front and rear hollows, the main box body is provided with mutually perpendicular left and right box body layering plates and upper and lower box body layering plates inside, the left and right box body layering plates and the upper and lower box body layering plates evenly divide the inside of the main box body into a left upper layer area, a right upper layer area, a left lower layer area and a right lower layer area, the bottoms of the left upper layer area, the right upper layer area, the left lower layer area and the right lower layer area are respectively provided with a plurality of anti-cracking test mold roller pulley groups, a concrete anti-cracking test mold is arranged on the upper part of the anti-cracking test mold roller pulley group, the top side walls of the left upper layer area, the right upper layer area, the left lower layer area and the right lower layer area are respectively provided with infrared sensors and fan fixing rods, a test area fan is fixedly provided on the fan fixing rod, a test area fan door is provided at the air outlet of the test area fan, a control mechanism is provided on the side walls of the main box body, and the infrared sensor, the test area fan and the test area fan door are respectively connected to the control mechanism through signal lines.

[0006] Test box wheels are arranged around the bottom of the main box body, and the test box wheels are PU universal wheels, and the single wheel load range of the test box wheels is 300kg~500kg.

[0007] The left and right layered plates of the box body are made of polypropylene PP honeycomb core plates, and the upper and lower layered plates of the box body are made of stainless steel plates.

[0008] A test area monitor is also provided at the top middle position of the upper left area, the upper right area, the lower left area and the lower right area. The test area monitor is an integrated monitor that can simultaneously detect the ambient temperature, humidity and wind speed of the test area. The test area monitor is connected to the control mechanism through a signal line.

[0009] The control mechanism includes a power indicator light, a power start / stop button, an emergency stop button, a control panel and a control chip. The control panel includes a display interface and setting buttons.

[0010] The anti-crack test mold roller pulley block includes a pulley connection fixing rod, a pulley bearing, a pulley and a pulley locking piece. The pulley connection fixing rod is connected to the main box body or the left and right layered plates of the box body as a whole. The pulley is installed on the pulley connection fixing rod through the pulley bearing. The top of the pulley is slidably connected to the concrete anti-crack test mold. The pulley locking piece is arranged at the bottom of the pulley. The start and stop of the anti-crack test mold pulley block can be controlled by manual installation or disassembly.

[0011] The concrete anti-cracking test mold comprises a flat plate method concrete early anti-cracking test mold and a test mold sliding plate that meets standard requirements. The test mold sliding plates are welded to both sides of the flat plate method concrete early anti-cracking test mold. During the concrete pouring stage, the concrete anti-cracking test mold can be taken out and placed on a vibration table to complete concrete pouring and surface finishing work. Then, the concrete anti-cracking test mold is transported to the front of the test device by a lifting vehicle, so that the test mold sliding plate contacts the anti-cracking test mold roller pulley set, and then it is manually pushed into the test device.

[0012] The technical effects of the utility model are as follows: 1. The utility model divides the interior of the main box into the upper left area, the upper right area, the lower left area and the lower right area by mutually perpendicular left and right layer plates and upper and lower layer plates of the box, and can support multiple groups of test pieces for testing at the same time, eliminating the influence of environmental factors on the test results. 2. The utility model adopts the main box partition structure and sets the same fan to supply air in each area, which ensures the stability of the wind speed and the consistency of the wind speed value during the test process, and cooperates with the monitoring instrument to detect the test environment, thereby improving the accuracy of the test results of the crack resistance test.

[0013] The following is a further description with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 The utility model is a structural schematic diagram of a concrete early anti-cracking test device.

[0015] Figure 2 The utility model is a side view of a concrete early anti-cracking test device.

[0016] Figure 3 It is a structural schematic diagram of the anti-cracking test die roller pulley block of the utility model.

[0017] Figure markings: 101-main box; 102-left and right layered plates of the box; 103-upper and lower layered plates of the box; 104-roller pulley group of the anti-crack test mold; 105-infrared sensor; 106-fan fixing rod; 107-test box wheel; 108-concrete anti-crack test mold; 201-test area fan; 202-test area fan door; 301-test area monitor; 401-power indicator light, 402-power start and stop button, 403-emergency stop button, 404-control panel; 405-control chip; 1041-pulley connecting fixing rod; 1042-pulley bearing; 1043-pulley; 1044-pulley locking plate; 1081-flat plate method concrete early anti-crack test mold; 1082-test mold sliding plate. DETAILED DESCRIPTION Example 1

[0018] like Figure 1 , Figure 2As shown, a concrete early crack resistance test device includes a main box 101, the main box 101 is a shell structure with front and rear hollows, and the main box 101 is provided with left and right box layering plates 102 and upper and lower box layering plates 103 which are perpendicular to each other. The left and right box layering plates 102 and the upper and lower box layering plates 103 divide the interior of the main box 101 into an upper left area, an upper right area, a lower left area and a lower right area, and the bottoms of the upper left area, the upper right area, the lower left area and the lower right area are respectively provided with a plurality of anti-cracking test mold roller pulley blocks 1 04. A concrete anti-crack test mold is provided on the upper part of the anti-crack test mold roller pulley group 104. The top side walls of the upper left area, the upper right area, the lower left area and the lower right area are respectively provided with infrared sensors 105 and fan fixing rods 106. A test area fan 201 is fixed on the fan fixing rod 106. A test area fan door 202 is provided at the air outlet of the test area fan 201. A control mechanism is provided on the side wall of the main box body 101. The test area fan 201 and the test area fan door 202 are respectively connected to the control mechanism through signal lines.

[0019] The utility model divides the interior of the main box into upper left area, upper right area, lower left area and lower right area by mutually perpendicular left and right layer plates and upper and lower layer plates of the box, and can support multiple groups of test pieces for testing at the same time, eliminating the influence of environmental factors on the test results. The present invention adopts the main box partition structure and sets the same fan to supply air in each area, which ensures the stability of wind speed and consistency of wind speed value during the test process, and improves the accuracy of the test results of crack resistance test. Example 2

[0020] On the basis of Example 1, in this embodiment, preferably, test box wheels 107 are provided around the bottom of the main box body 101, and the test box wheels 107 are PU universal wheels, and the single wheel load range of the test box wheels 107 is 300kg~500kg.

[0021] The bottom of the main box body 101 of the utility model is provided with test box wheels 107 around it. The test box wheels 107 are PU universal wheels, which are convenient for moving the main box body 101 and meet the use under different conditions. Example 3

[0022] On the basis of Example 1 or Example 2, in this embodiment, preferably, the left and right layered plates 102 of the box body are polypropylene PP honeycomb core plates, and the upper and lower layered plates 103 of the box body are stainless steel plates.

[0023] The left and right layered plates 102 of the box body of the utility model are made of polypropylene PP honeycomb core plates, which have good sealing performance and light weight. The upper and lower layered plates 103 of the box body are made of stainless steel plates, which have strong load-bearing capacity. Example 4

[0024] On the basis of Example 1 or Example 3, in this embodiment, preferably, a test area monitor 301 is also provided in the top middle position of the upper left area, the upper right area, the lower left area and the lower right area. The test area monitor 301 is an integrated monitor that can simultaneously detect the ambient temperature, humidity and wind speed of the test area. The test area monitor 301 is connected to the control mechanism through a signal line.

[0025] The test area monitor 301 described in the present invention is an integrated monitor that can simultaneously detect the ambient temperature, humidity and wind speed of the test area, thereby ensuring that the test environment in the test area is the same and improving the accuracy of the anti-cracking performance test results. Example 5

[0026] Based on Example 1 or Example 4, in this embodiment, preferably, the control mechanism includes a power indicator light 401, a power start / stop button 402, an emergency stop button 403, a control panel 404 and a control chip 405, and the control panel 404 includes a display interface and setting buttons.

[0027] The control mechanism described in the utility model includes a power indicator light 401, a power start / stop button 402, an emergency stop button 403, a control panel 404 and a control chip 405. The control panel 404 includes a display interface and setting buttons. The power of the test area fan 201 is observed and adjusted through the control panel 404 of the control mechanism, and the opening and closing time of the test area fan 201 and the test area fan door 202 are controlled, and the parameters of the test area monitor 301 are displayed. Example 6

[0028] On the basis of Example 1 or Example 5, Figure 3 As shown, in this embodiment, preferably, the anti-crack test mold roller pulley group 104 includes a pulley connecting and fixing rod 1041, a pulley bearing 1042, a pulley 1043 and a pulley locking piece 1044, the pulley connecting and fixing rod 1041 is connected as a whole with the main box body 101 or the left and right layered plates 102 of the box body, the pulley 1043 is installed on the pulley connecting and fixing rod 1041 through the pulley bearing 1042, the top of the pulley 1043 is slidably connected to the concrete anti-crack test mold 108, the pulley locking piece 1044 is arranged at the bottom of the pulley 1043, and the start and stop of the anti-crack test mold pulley group can be controlled by manual installation or disassembly.

[0029] The top of the pulley 1043 of the utility model is slidably connected to the concrete anti-crack test mold 108. During actual use, the concrete anti-crack test mold 108 is in point contact with the top of the pulley 1043, and the sliding of the concrete anti-crack test mold 108 is achieved through rolling friction. A pulley locking piece 1044 is provided at the bottom of the pulley 1043, which can facilitate the starting and stopping of the anti-crack test mold pulley group. Example 7

[0030] On the basis of Example 1 or Example 6, in this embodiment, preferably, the concrete anti-crack test mold 108 includes a flat plate method concrete early anti-crack test mold 1081 and a test mold sliding plate 1082 that meet the standard requirements, and the test mold sliding plate 1082 is welded to both sides of the flat plate method concrete early anti-crack test mold 1081. During the concrete pouring stage, the concrete anti-crack test mold 108 can be taken out and placed on a vibration table to complete the concrete pouring and finishing work, and then the concrete anti-crack test mold 108 is transported to the front of the test device by a lifting vehicle, so that the test mold sliding plate 1082 is in contact with the anti-crack test mold roller pulley set 104, and then it is manually pushed into the test device.

[0031] The utility model pushes the concrete anti-cracking test mold 108 into the test device by the test mold sliding plate 1082 contacting the anti-cracking test mold roller pulley set 104 and the anti-cracking test mold roller pulley set 104 rolling, which is simple and convenient to operate.

[0032] When the utility model conducts the early anti-cracking test of concrete, the specific steps are as follows:

[0033] Step 1: Place the concrete early crack resistance test device of the utility model into a test room that meets the test environment requirements, start the device, open the test area fans 201 and the test area fan doors 202 of the upper left area, the upper right area, the lower left area and the lower right area for no-load operation, observe and adjust the power of the test area fans 201 through the control panel 404 of the control mechanism, so that the wind speed of the test area of ​​the upper left area, the upper right area, the lower left area and the lower right area meets the test requirements, and close the test device;

[0034] Step 2: Form concrete early crack resistance test specimens according to the specification requirements, and install the concrete crack resistance test mold 108 containing the concrete specimen to be tested into each test area through the crack resistance test mold roller pulley set 104. The infrared sensor 105 can monitor and prompt whether the concrete crack resistance test mold is placed in place;

[0035] Step 3: according to the concrete sample forming time of each test area, the opening and closing time of the test area fan 201 and the opening and closing time of the fan door 202 of each test area are set through the control panel 404, and the test is started;

[0036] Step 4: After the test is finished, the test area fan 201 stops working, the test area fan door 202 is closed, and the concrete sample is taken out through the anti-cracking test mold roller pulley group 104.

[0037] Step 5: Measure and calculate the concrete specimens according to the specifications and obtain the test results.

[0038] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily thought of by any technician familiar with the technical field within the technical scope disclosed in the present invention should be included in the protection scope of the present invention.

Claims

1. A concrete early crack resistance test device, characterized in that: The invention comprises a main box body (101), wherein the main box body (101) is a shell structure with front and rear hollow sections, wherein the main box body (101) is provided with mutually perpendicular left and right box body layering plates (102) and upper and lower box body layering plates (103), wherein the left and right box body layering plates (102) and upper and lower box body layering plates (103) evenly divide the interior of the main box body (101) into a left upper layer area, a right upper layer area, a left lower layer area and a right lower layer area, wherein the bottoms of the left upper layer area, the right upper layer area, the left lower layer area and the right lower layer area are respectively provided with a plurality of anti-crack test mold roller pulley assemblies (104), wherein the anti-crack test mold roller pulley assemblies (104) are ... 4) A concrete anti-cracking test mold (108) is provided at the upper part, and the top side walls of the upper left area, the upper right area, the lower left area, and the lower right area are respectively provided with infrared sensors (105) and fan fixing rods (106), a test area fan (201) is fixedly provided on the fan fixing rod (106), and a test area fan door (202) is provided at the air outlet of the test area fan (201), and a control mechanism is provided on the side wall of the main box body (101), and the infrared sensor (105), the test area fan (201), and the test area fan door (202) are respectively connected to the control mechanism through signal lines.

2. A concrete early cracking test device according to claim 1, characterized in that: Test box wheels (107) are arranged around the bottom of the main box body (101); the test box wheels (107) are PU universal wheels; and the single wheel load range of the test box wheels (107) is 300 kg to 500 kg.

3. A concrete early crack resistance test device according to claim 1, characterized in that: The left and right layered plates (102) of the box body are made of polypropylene PP honeycomb core plates, and the upper and lower layered plates (103) of the box body are made of stainless steel plates.

4. The early-stage crack resistance test device for concrete according to claim 1, characterized in that: A test area monitor (301) is also provided at the top middle position of the upper left area, the upper right area, the lower left area and the lower right area. The test area monitor (301) is an integrated monitor that can simultaneously detect the ambient temperature, humidity and wind speed of the test area. The test area monitor (301) is connected to the control mechanism via a signal line.

5. The early-stage crack resistance test device for concrete according to claim 1, characterized in that: The control mechanism comprises a power indicator light (401), a power start / stop button (402), an emergency stop button (403), a control panel (404) and a control chip (405); the control panel (404) comprises a display interface and setting buttons.

6. The early-stage crack resistance test device for concrete according to claim 1, characterized in that: The anti-crack test mold roller pulley block (104) comprises a pulley connection fixing rod (1041), a pulley bearing (1042), a pulley (1043) and a pulley locking piece (1044); the pulley connection fixing rod (1041) is connected to the main box body (101) or the left and right layered plates (102) of the box body as a whole; the pulley (1043) is installed on the pulley connection fixing rod (1041) through the pulley bearing (1042); the top of the pulley (1043) is slidably connected to the concrete anti-crack test mold (108); the pulley locking piece (1044) is arranged at the bottom of the pulley (1043); and the start and stop of the anti-crack test mold pulley block can be controlled by manual installation or removal.

7. The early-stage crack resistance test device for concrete according to claim 1, characterized in that: The concrete anti-cracking test mold (108) comprises a flat plate method concrete early anti-cracking test mold (1081) that meets standard requirements and a test mold sliding plate (1082), wherein the test mold sliding plate (1082) is welded to both sides of the flat plate method concrete early anti-cracking test mold (1081).

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