Test block pouring mold for testing fracture toughness of concrete

Abstract

The utility model discloses a test block pouring mold for testing fracture toughness of concrete. The test block pouring mold comprises a front baffle, a left baffle, a rear baffle, a right baffle, a bottom plate, a longitudinal connecting rod, a top plate and an L-shaped connecting rod, the front baffle plate, the left baffle plate, the rear baffle plate and the right baffle plate are vertically fixed on the bottom plate in sequence, and the bottom plate is connected with the front baffle plate, the left baffle plate, the rear baffle plate and the right baffle plate through baffle plate connecting components; the lower end of a longitudinal connecting rod is fixed to the bottom plate, the longitudinal connecting rod penetrates through the top plate, the top plate is installed on the longitudinal connecting rod, one end of an L-shaped connecting rod is fixed to the longitudinal connecting rod, and the other end of the L-shaped connecting rod is provided with a copper sheet groove. The die can solve the problems that the position of a prefabricated crack is unstable and inaccurate, and copper sheets are not firmly and accurately pasted before fracture toughness testing.

Description

Technical Field

[0001] The utility model relates to a mould, in particular to a test block casting mould for concrete fracture toughness testing. Background Art

[0002] As the most widely used building material in the world today, concrete has defects such as high brittleness, easy cracking, and poor toughness. Once concrete cracks, the life of the building is greatly shortened and the bearing capacity is reduced, seriously affecting the safety performance. How to improve the fracture toughness of concrete is crucial to improving the durability of concrete structures.

[0003] According to the "Hydraulic Concrete Fracture Test Procedure" (DLT 5332-2005), there are two methods for testing concrete fracture toughness: the wedge splitting method and the three-point bending beam method. The three-point bending beam method is often used to test concrete fracture parameters. The three-point bending beam method requires the use of steel plates to be embedded to generate prefabricated cracks, that is, a release agent is applied to both sides of the steel plate, and the steel plate is pulled out after the concrete has initially set to form a prefabricated crack. However, in the actual process, the pouring and vibration of concrete will affect the position of the steel plate, resulting in inaccurate positions of prefabricated cracks and test deviations.

[0004] At present, the measurement of crack opening displacement in the three-point bending beam test is often done with a clamp-on extensometer. The specific operation is to paste copper sheets or thin steel plates on both sides of the lower end of the prefabricated crack before the test, and embed the extensometer between the pasted copper sheets or steel plates. However, due to the inaccurate pasting position of the copper sheets or thin steel plates and the loose pasting, there will be non-negligible errors in the displacement measurement.

[0005] In summary, the traditional concrete fracture toughness test method has the problems of inaccurate prefabricated crack position and inaccurate bonding of the copper sheet or thin steel plate embedded with the extensometer, which leads to inevitable test errors. Therefore, the utility model provides a concrete fracture toughness test block casting mold that is easy to operate and accurately positions the prefabricated steel plate and copper sheet, which has very important practical significance. Utility Model Content

[0006] The purpose of the utility model is to overcome the shortcomings of the above-mentioned prior art and provide a test block casting mold for concrete fracture toughness test, which solves the problems of unstable and inaccurate prefabricated crack positions and loose and inaccurate pasting of copper sheets before fracture toughness test.

[0007] To achieve the above object, the utility model discloses a test block casting mold for concrete fracture toughness test, comprising a front baffle, a left baffle, a rear baffle, a right baffle, a bottom plate, a longitudinal connecting rod, a top plate and an L-shaped connecting rod;

[0008] The front baffle, the left baffle, the rear baffle and the right baffle are sequentially erected and fixed on the bottom plate, wherein the bottom plate is connected to the front baffle, the left baffle, the rear baffle and the right baffle via baffle connecting components;

[0009] The lower end of the longitudinal connecting rod is fixed on the bottom plate, the longitudinal connecting rod passes through the top plate, the top plate is installed on the longitudinal connecting rod, one end of the L-shaped connecting rod is fixed on the longitudinal connecting rod, and the other end of the L-shaped connecting rod is provided with a copper sheet groove.

[0010] A slot is provided on the lower surface of the top plate, and the upper end of the prefabricated steel plate is embedded in the slot.

[0011] A screw rod is arranged on the top of the prefabricated steel plate, a through hole is arranged on the bottom of the slot, and a first nut is sleeved on the screw rod after passing through the through hole.

[0012] Two second nuts are sleeved on the longitudinal connecting rod, and the top plate is located between the two second nuts.

[0013] The transverse connecting rod passes through the front baffle plate and the rear baffle plate, and the transverse connecting rod is connected to the front baffle plate and the rear baffle plate via a third nut.

[0014] The longitudinal connecting rod is provided with a mounting through hole for the L-shaped connecting rod to pass through, and the L-shaped connecting rod is sleeved with a fourth nut after passing through the mounting through hole.

[0015] The baffle connecting component includes an L-shaped iron sheet and a bolt.

[0016] The upper surface of the bottom plate is provided with a groove, and the lower ends of the front baffle, the rear baffle, the left baffle 3 and the right baffle are all embedded in the groove.

[0017] The longitudinal connecting rod is graduated.

[0018] The number of the longitudinal connecting rods is four;

[0019] The number of the L-shaped connecting rods is two, and the copper sheet grooves on the two L-shaped connecting rods are buckled.

[0020] The utility model has the following beneficial effects:

[0021] During specific operation, the test block casting mold for concrete fracture toughness test described in the utility model is as follows: the bottom plate, the front baffle plate, the rear baffle plate, the left baffle plate and the right baffle plate are spliced ​​together to form an integral casting cavity for the test block; the top plate and the longitudinal connecting rod are fixed on the top of the casting cavity, and the prefabricated steel plate is connected to the top plate to have the function of adjusting the height; the copper sheet or thin steel plate embedded with the extensometer is placed in the copper sheet groove to achieve the purpose of firmly sticking the copper sheet or thin steel plate, thereby solving the problems of unstable and inaccurate prefabricated crack positions made by the traditional method and the problem of loose and inaccurate sticking of the copper sheet before the fracture toughness test. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a structural diagram of the utility model;

[0023] Figure 2 It is the front view of the utility model;

[0024] Figure 3 It is a side view of the utility model;

[0025] Figure 4 It is a top view of the utility model.

[0026] Among them, 1 is the bottom plate, 2 is the front baffle, 3 is the left baffle, 4 is the longitudinal connecting rod, 5 is the top plate, 6 is the prefabricated steel plate, 7 is the first nut, 8 is the second nut, 9 is the rear baffle, 10 is the right baffle, 11 is the transverse connecting rod, 12 is the third nut, 13 is the baffle connecting component, 14 is the copper sheet groove, 15 is the fourth nut, and 16 is the L-shaped connecting rod. DETAILED DESCRIPTION

[0027] In order to enable those skilled in the art to better understand the solution of the utility model, the technical solution in the embodiment of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiment of the utility model. Obviously, the described embodiment is only an embodiment of a part of the utility model, not all embodiments, and is not intended to limit the scope of the disclosure of the utility model. In addition, in the following description, the description of known structures and technologies is omitted to avoid unnecessary confusion of the concepts disclosed in the utility model. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without making creative work should fall within the scope of protection of the utility model.

[0028] The accompanying drawings show schematic diagrams of structures according to the disclosed embodiments of the utility model. These figures are not drawn to scale, and some details are magnified and some details may be omitted for the purpose of clear expression. The shapes of various regions and layers shown in the figures and the relative sizes and positional relationships therebetween are only exemplary, and may deviate in practice due to manufacturing tolerances or technical limitations, and those skilled in the art may design regions / layers with different shapes, sizes, and relative positions according to actual needs.

[0029] refer to Figure 1 , Figure 2 , Figure 3 and Figure 4 The concrete fracture toughness test block casting mold of the utility model comprises a bottom plate 1, a front baffle 2, a left baffle 3, a longitudinal connecting rod 4, a top plate 5, a prefabricated steel plate 6, a first nut 7, a second nut 8, a rear baffle 9, a right baffle 10, a transverse connecting rod 11, a third nut 12, a baffle connecting component 13, a copper sheet groove 14, a fourth nut 15 and an L-shaped connecting rod 16;

[0030] The front baffle 2 , the left baffle 3 , the rear baffle 9 and the right baffle 10 are vertically fixed on the bottom plate 1 in sequence, wherein the bottom plate 1 is connected to the front baffle 2 , the left baffle 3 , the rear baffle 9 and the right baffle 10 via a baffle connecting component 13 .

[0031] The transverse connecting rod 11 passes through the front baffle 2 and the rear baffle 9 , and the transverse connecting rod 11 is connected to the front baffle 2 and the rear baffle 9 via a third nut 12 .

[0032] The lower end of the longitudinal connecting rod 4 is fixed on the bottom plate 1, the longitudinal connecting rod 4 passes through the top plate 5, and two second nuts 8 are sleeved on the longitudinal connecting rod 4, the top plate 5 is located between the two second nuts 8, the upper end of the prefabricated steel plate 6 is fixed on the top plate 5, one end of the L-shaped connecting rod 16 is fixed to the longitudinal connecting rod 4 through a fourth nut 15, and the other end of the L-shaped connecting rod 16 is provided with a copper sheet groove 14.

[0033] In this embodiment, a screw is provided on the top of the prefabricated steel plate 6, a slot is provided on the lower surface of the top plate 5, a through hole is provided at the bottom of the slot, the upper end of the prefabricated steel plate 6 is embedded in the slot, and the screw is passed through the through hole and then sleeved with a first nut 7.

[0034] In this embodiment, a groove is provided on the upper surface of the bottom plate 1 , and the lower ends of the front baffle 2 , the rear baffle 9 , the left baffle 3 , and the right baffle 10 are all embedded in the groove.

[0035] In this embodiment, the baffle connecting component 13 includes an L-shaped iron sheet and bolts.

[0036] In this embodiment, the longitudinal connecting rod 4 is provided with a mounting through hole for the L-shaped connecting rod 16 to pass through, and the L-shaped connecting rod 16 is sleeved with a fourth nut 15 after passing through the mounting through hole.

[0037] In this embodiment, the size of the prefabricated steel plate 6 is 100 mm×100 mm×2 mm.

[0038] In this embodiment, the size of the inner wall of the casting cavity formed by the bottom plate 1, the front baffle plate 2, the rear baffle plate 9, the left baffle plate 3 and the right baffle plate 10 is 400 mm×100 mm×100 mm.

[0039] In this embodiment, in actual operation, the height of the prefabricated steel plate 6 is adjusted by adjusting the position of the first nut 7 .

[0040] In this embodiment, the longitudinal connecting rod 4 is provided with scales.

[0041] The specific application process of the utility model is:

[0042] The front baffle 2, the rear baffle 9, the left baffle 3, and the right baffle 10 are respectively inserted into the corresponding grooves of the bottom plate 1, and are respectively connected by the baffle connecting parts 13. The transverse connecting rod 11 is inserted into the through holes on the front baffle 22 and the rear baffle 9, and the third nut 12 is tightened.

[0043] Insert the prefabricated steel plate 6 into the slot of the top plate 5 and tighten the first nut 7 to fix the prefabricated steel plate 6, insert the longitudinal connecting rod 4 into the through hole on the top plate 5, and adjust the height according to the observation scale to adjust the top plate 5 to the required prefabricated crack length, and tighten the second nut 8.

[0044] Pour the concrete, vibrate it on a vibrating table to make it dense, put the copper sheet into the copper sheet groove 14 and insert it into the slurry, and then put it into a standard curing box.

[0045] After curing for 12 hours, the prefabricated crack forming part is removed, that is, the second nut 8 is loosened first, and the top plate 5 together with the prefabricated steel plate 6 is moved upward.

[0046] After curing for 24 hours, the integrally formed part of the test block is removed, that is, the third nut 12 is loosened first, and the two transverse connecting rods 11 are pulled out from the through holes; the baffle connecting component 13 is removed, and the front baffle 2, the rear baffle 9, the left baffle 3 and the right baffle 10 are taken out from the groove on the bottom plate 1, and finally the test block is taken out and the curing is continued until the age of 28 days.

[0047] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the utility model rather than to limit it. Although the utility model is described in detail with reference to the above embodiments, ordinary technicians in the relevant field should understand that the specific implementation methods of the utility model can still be modified or replaced by equivalents, and any modification or equivalent replacement that does not depart from the spirit and scope of the utility model should be included in the scope of protection of the claims of the utility model.

Claims

1. A test block casting mold for concrete fracture toughness testing, characterized in that: It comprises a front baffle (2), a left baffle (3), a rear baffle (9), a right baffle (10), a bottom plate (1), a longitudinal connecting rod (4), a top plate (5) and an L-shaped connecting rod (16); The front baffle (2), the left baffle (3), the rear baffle (9) and the right baffle (10) are vertically fixed on the bottom plate (1) in sequence, wherein the bottom plate (1) is connected to the front baffle (2), the left baffle (3), the rear baffle (9) and the right baffle (10) via a baffle connecting component (13); The lower end of the longitudinal connecting rod (4) is fixed on the bottom plate (1), the longitudinal connecting rod (4) passes through the top plate (5), the top plate (5) is installed on the longitudinal connecting rod (4), one end of the L-shaped connecting rod (16) is fixed on the longitudinal connecting rod (4), and the other end of the L-shaped connecting rod (16) is provided with a copper sheet groove (14).

2. The concrete fracture toughness test block casting mold according to claim 1, characterized in that: The lower surface of the top plate (5) is provided with a slot, and the upper end of the prefabricated steel plate (6) is embedded in the slot.

3. The concrete fracture toughness test block casting mold according to claim 2, characterized in that: A screw rod is arranged at the top of the prefabricated steel plate (6), a through hole is arranged at the bottom of the slot, and a first nut (7) is sleeved on the screw rod after passing through the through hole.

4. The concrete fracture toughness test block casting mold according to claim 3, characterized in that: Two second nuts (8) are sleeved on the longitudinal connecting rod (4), and the top plate (5) is located between the two second nuts (8).

5. The concrete fracture toughness test block casting mold according to claim 4, characterized in that: It also comprises a transverse connecting rod (11), which passes through the front baffle (2) and the rear baffle (9), and the transverse connecting rod (11) is connected to the front baffle (2) and the rear baffle (9) via a third nut (12).

6. The concrete fracture toughness test block casting mold according to claim 5, characterized in that: The longitudinal connecting rod (4) is provided with a mounting through hole for the L-shaped connecting rod (16) to pass through, and the L-shaped connecting rod (16) is sleeved with a fourth nut (15) after passing through the mounting through hole.

7. The concrete fracture toughness test block casting mold according to claim 1, characterized in that: The baffle connecting component (13) comprises an L-shaped iron sheet and a bolt.

8. The test block casting mold for concrete fracture toughness test according to claim 1, characterized in that: The upper surface of the bottom plate (1) is provided with a groove, and the lower ends of the front baffle (2), the rear baffle (9), the left baffle (3) and the right baffle (10) are all embedded in the groove.

9. The concrete fracture toughness test block casting mold according to claim 1, characterized in that: The longitudinal connecting rod (4) is provided with scales.

10. The test block casting mold for concrete fracture toughness test according to claim 1, characterized in that: The number of the longitudinal connecting rods (4) is four; The number of the L-shaped connecting rods (16) is two, and the copper sheet grooves (14) on the two L-shaped connecting rods (16) are buckled.

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