Concrete homogeneity testing device

Abstract

The utility model discloses a concrete homogeneity testing device, which comprises a rotation driving mechanism, which comprises a driving source and a turntable capable of being driven by the driving source to rotate; the sample box assembly is arranged on the rotating disc, is spaced from the rotating shaft of the rotating disc and comprises a sample box with a sample cavity and a screen arranged on the sample box, and the screen is located on the side, away from the rotating shaft of the rotating disc, of the sample cavity. The concrete homogeneity testing device provides a new concrete homogeneity testing thought, and is suitable for homogeneity testing of hard concrete.

Description

Technical Field

[0001] This utility model relates to the field of concrete testing technology, and in particular to a concrete homogeneity testing device. Background Technology

[0002] Concrete homogeneity is an important indicator describing the uniformity of spatial distribution of various raw material components in a concrete mixture. It has a significant impact on the strength, durability, and other properties of hardened concrete and is one of the key factors in evaluating the quality of concrete production.

[0003] The patent with application number 202410583334.X provides a comprehensive test method for the homogeneity of concrete, which can test the thickness of the laitance, the content of its components, the density, and the consistency of the concrete to evaluate the homogeneity of the concrete. However, this method is only applicable to concrete with good fluidity and not to dry-hard concrete, and the test process is relatively complicated. Utility Model Content

[0004] This invention aims to solve at least one of the technical problems existing in the prior art. To this end, this invention proposes a concrete homogeneity testing device, applicable to the homogeneity testing of dry-hard concrete.

[0005] A concrete homogeneity testing device according to some embodiments of the present invention includes: a rotary drive mechanism, including a drive source and a turntable that can be driven to rotate by the drive source; a sample box assembly disposed on the turntable and spaced apart from the rotation axis of the turntable, the sample box assembly including a sample box having a sample cavity and a sieve disposed on the sample box, the sieve being located on the side of the sample cavity away from the rotation axis of the turntable.

[0006] The concrete homogeneity testing device according to the embodiments of this utility model has at least the following beneficial effects:

[0007] When using the concrete homogeneity testing device of this invention to test the homogeneity of concrete:

[0008] First: The coarse aggregate used in the concrete to be tested was subjected to a sieve test according to the sieve test method of crushed stone or gravel in the standard JGJ 52-2006 "Standard for Quality and Test Methods of Sand and Stone for Ordinary Concrete", and A1, A2, and B were calculated. Among them, A1 is the partial sieve residue (unit: %) of the aggregate with the largest nominal diameter (nominal diameter of 63mm), A2 is the partial sieve residue (unit: %) of the aggregate with a nominal diameter of 4.75mm, and B is the ratio of A1 to A2.

[0009] Then, weigh the raw materials according to the mix proportion of the concrete to be tested (cement: fly ash: mineral powder: crushed stone: manufactured sand: water: water-reducing agent = 320:60:110:970:800:150:9.8), mix the raw materials together in a mixer, and then gently pour them into the sample chamber of the sample box. Before pouring into the sample box, a release agent can be applied to the inside of the sample box. The sieve should be selected to be close to the maximum nominal particle size of the coarse aggregate, i.e., 63 mm.

[0010] Next, the sample box assembly is installed on the turntable, and then the rotation drive mechanism is run, so that the sample box assembly moves in a circular motion, causing some concrete to overflow from the screen under the action of centrifugal force.

[0011] Next, collect the concrete overflowing from the screen, rinse with water to retain the aggregate, and dry to constant weight. Then, calculate the partial sieve residue a1 of the aggregate with the largest nominal size and the partial sieve residue a2 of the aggregate with a nominal size of 4.75mm, and calculate the ratio b of a1 to a2.

[0012] Finally, calculate the non-uniformity coefficient α = b / B. If the value of α is between [1, 2], the homogeneity of the concrete is considered to be good; if the value of α is greater than 2, the homogeneity of the concrete is considered to be average.

[0013] It should be noted that the above-mentioned concrete homogeneity testing device provides a new approach to concrete homogeneity testing and is applicable to the homogeneity testing of dry-hard concrete.

[0014] According to some embodiments of this utility model, the side of the sample box facing away from the rotation axis of the turntable has an open structure.

[0015] According to some embodiments of the present invention, the sieve is disposed inside the sample box, and the internal space of the sample box is divided into the sample cavity and the temporary storage cavity, the temporary storage cavity being located on the side of the sieve away from the rotation axis of the turntable.

[0016] According to some embodiments of the present invention, the sample box is provided with a drain port on the side wall of the temporary storage cavity, and a filter screen is provided at the drain port.

[0017] According to some embodiments of the present invention, the sample box assembly further includes a baffle, which has an installed state and a disassembled state. When the baffle is in the installed state, the baffle is close to the side of the sieve away from the sample cavity, or is disposed on the side of the sieve close to the sample cavity.

[0018] According to some embodiments of the present invention, the sample box is provided with a first slot, and the baffle is detachably inserted into the first slot.

[0019] According to some embodiments of the present invention, the turntable is provided with a groove extending radially along the turntable, the sample box is provided with a slider disposed in the groove, and the sample box is configured to be able to move along the groove to adjust its position.

[0020] According to some embodiments of the present invention, the concrete homogeneity testing device further includes a base, the base having mounting holes for mounting the drive source.

[0021] According to some embodiments of the present invention, the turntable is located above the base, and the base is provided with a support component for supporting the turntable.

[0022] According to some embodiments of the present invention, the turntable includes a bottom plate and a retaining edge connected to the edge of the bottom plate, the retaining edge extending upward from the bottom plate.

[0023] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0024] The present invention will be further described below with reference to the accompanying drawings and embodiments, wherein:

[0025] Figure 1 This is a schematic diagram of the structure of a concrete homogeneity testing device according to an embodiment of the present invention;

[0026] Figure 2 This is a partial structural schematic diagram of a concrete homogeneity testing device according to an embodiment of the present invention;

[0027] Figure 3 for Figure 2 A partial structural schematic diagram of the figure shown;

[0028] Figure 4 This is a schematic diagram of the structure of a sample box assembly according to an embodiment of the present invention;

[0029] Figure 5 for Figure 4 Enlarged view of point A in the middle;

[0030] Figure 6 This is a schematic diagram of the sample box assembly according to another embodiment of the present invention;

[0031] Figure 7 for Figure 6 Another perspective view of the figure shown.

[0032] Icon labels:

[0033] 100. Rotary drive mechanism; 110. Drive source; 120. Turntable; 121. Turntable bottom; 1211. Slide groove; 122. Side guard;

[0034] 200. Sample box assembly; 210. Sample box; 211. Sample chamber; 212. Slider; 213. First slot; 214. Second slot; 215. Temporary storage chamber; 216. Filter screen; 220. Sieve screen; 230. Baffle;

[0035] 300, base; 310, mounting hole; 320, support assembly; 321, support rod; 322, support block. Detailed Implementation

[0036] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model.

[0037] In the description of this utility model, it should be understood that the terms "center," "longitudinal," "transverse," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "axial," "radial," and "circumferential," etc., indicating orientation or positional relationships, are based on the orientation or positional relationships shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description. They do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, features defined with "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, unless otherwise stated, "a plurality of" means two or more.

[0038] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0039] like Figure 1 As shown, a concrete homogeneity testing device provided in one embodiment of the present invention includes a rotary drive mechanism 100 and a sample box assembly 200.

[0040] Combination Figure 2 and Figure 3 The rotary drive mechanism 100 includes a drive source 110 and a turntable 120 that can be driven to rotate by the drive source 110.

[0041] Specifically, the drive source 110 is a motor, and the turntable 120 is connected to the drive shaft of the motor. The drive source 110 can drive the turntable 120 to rotate along the axis of the turntable 120.

[0042] Furthermore, the concrete homogeneity testing device also includes a base 300, which has mounting holes 310 for mounting a drive source 110. The base 300 can provide support for the drive source 110, and the turntable 120 is located above the base 300.

[0043] The base 300 is provided with a support component 320 for supporting the turntable 120. The support component 320 can support the turntable 120, thereby reducing the risk of the turntable 120 overturning. It can also share the pressure from the turntable 120 on the drive source 110, reducing the risk of the drive source 110 being damaged by pressure.

[0044] Furthermore, there are multiple support components 320, which are arranged around the rotation axis (axis) of the turntable 120. The multiple support components 320 jointly support the turntable 120, thereby improving the uniformity of the force on the turntable 120.

[0045] It should be noted that the support component 320 and the turntable 120 are in contact with each other. The support component 320 provides support for the turntable 120, but does not hinder the rotation of the turntable 120 itself.

[0046] like Figure 3 As shown, in some embodiments, the support assembly 320 includes a support rod 321 connected to the base 300 at its bottom end, and a support block 322 connected to the top end of the support rod 321. The support block 322 supports the turntable 120. In other embodiments, the support block 322 is replaced by a ball bearing capable of rotating 360° on its own. The ball bearing supports the turntable 120, and during the rotation of the turntable 120, the turntable 120 can drive the ball bearing to rotate. In this way, the friction between the ball bearing and the turntable 120 is relatively small, which can improve the problem of wear on the turntable 120.

[0047] like Figure 1 As shown, the sample box assembly 200 is disposed on the turntable 120 and spaced apart from the rotation axis of the turntable 120. In other words, when the turntable 120 rotates, the turntable 120 can drive the sample box assembly 200 to perform circular motion around the rotation axis of the turntable 120.

[0048] Furthermore, the turntable 120 includes a bottom 121 and a retaining edge 122 connected to the edge of the bottom 121. The retaining edge 122 extends upward from the bottom 121 and can protect the sample box assembly 200.

[0049] like Figure 4 As shown, the sample box assembly 200 includes a sample box 210 with a sample cavity 211 and a sieve 220 disposed in the sample box 210, combined with Figure 1 and Figure 4 The sieve 220 is located on the side of the sample chamber 211 away from the rotation axis of the turntable 120.

[0050] When using the concrete homogeneity testing device of this invention to test the homogeneity of concrete:

[0051] First: The coarse aggregate used in the concrete to be tested was subjected to a sieve test according to the sieve test method of crushed stone or gravel in the standard JGJ 52-2006 "Standard for Quality and Test Methods of Sand and Stone for Ordinary Concrete", and A1, A2, and B were calculated. Among them, A1 is the partial sieve residue (unit: %) of the aggregate with the largest nominal diameter (nominal diameter of 63mm), A2 is the partial sieve residue (unit: %) of the aggregate with a nominal diameter of 4.75mm, and B is the ratio of A1 to A2.

[0052] Then, weigh the raw materials according to the mix proportion of the concrete to be tested (cement: fly ash: mineral powder: crushed stone: manufactured sand: water: water-reducing agent = 320:60:110:970:800:150:9.8), mix the raw materials in a mixer, and then gently pour them into the sample cavity 211 of the sample box 210. Before pouring into the sample box 210, a release agent can be applied to the inside of the sample box 210. The sieve 220 should be selected to be close to the maximum nominal particle size of the coarse aggregate, i.e., 63 mm.

[0053] Then, the sample box assembly 200 is installed on the turntable 120, and the rotary drive mechanism 100 is run, so that the sample box assembly 200 performs circular motion, causing some concrete to overflow from the screen 220 under the action of centrifugal force.

[0054] Next, collect the concrete overflowing from screen 220, rinse with water to retain the aggregate, and dry to constant weight. Then, calculate the partial sieve residue a1 of the aggregate with the largest nominal size and the partial sieve residue a2 of the aggregate with a nominal size of 4.75mm, and calculate the ratio b of a1 to a2.

[0055] Finally, calculate the non-uniformity coefficient α = b / B. If the value of α is between [1, 2], the homogeneity of the concrete is considered to be good; if the value of α is greater than 2, the homogeneity of the concrete is considered to be average.

[0056] It should be noted that the above-mentioned concrete homogeneity testing device provides a new approach to concrete homogeneity testing and is applicable to the homogeneity testing of dry-hard concrete.

[0057] Combination Figure 1 and Figure 4 In some embodiments, the side of the sample box 210 facing away from the rotation axis of the turntable 120 is open. In other words, the side of the sieve 220 away from the sample chamber 211 is open, so that the material screened by the sieve 220 will pass through the sieve 220 and be collected by the tester. It is understood that the retaining edge 122 of the turntable 120 can block concrete overflowing from the sieve 220, so that the overflowing concrete can be concentrated on the turntable 120 for easy collection by the tester.

[0058] Combination Figure 1 and Figure 6 In another embodiment, the sieve 220 is disposed within the sample box 210, dividing the internal space of the sample box 210 into a sample chamber 211 and a temporary storage chamber 215. It is understood that the sample chamber 211 is located on the side of the sieve 220 closer to the rotation axis of the turntable 120, while the temporary storage chamber 215 is located on the side of the sieve 220 away from the rotation axis of the turntable 120. Thus, the material sieved by the sieve 220 will pass through the sieve 220 into the temporary storage chamber 215 for collection by the testing personnel.

[0059] Combination Figure 6 and Figure 7 Furthermore, the sample box 210 has a drain port on the side wall of the temporary storage cavity 215, and a filter screen 216 is provided at the drain port.

[0060] Understandably, after the rotary drive mechanism 100 stops running, the sample box 210 can be taken out, and then water can be directly flushed into the temporary storage chamber 215 to clean the material in the temporary storage chamber 215. After that, the material in the temporary storage chamber 215 can be taken out.

[0061] It should be noted that the filter screen 216 is designed to allow wastewater to pass through while preventing the screened material from passing through.

[0062] Combination Figure 4 and Figure 5 In some embodiments, the sample box assembly 200 further includes a baffle 230, which has an installed state and a disassembled state. When the baffle 230 is in the installed state, the baffle 230 is close to the side of the sieve 220 away from the sample chamber 211, or is disposed on the side of the sieve 220 close to the sample chamber 211. When the baffle 230 is in the disassembled state, the baffle 230 is detached from the sample box 210.

[0063] It is understandable that when using the concrete homogeneity testing device of this utility model to conduct homogeneity testing on concrete:

[0064] First: The coarse aggregate used in the concrete to be tested was subjected to a sieve test according to the sieve test method of crushed stone or gravel in the standard JGJ 52-2006 "Standard for Quality and Test Methods of Sand and Stone for Ordinary Concrete", and A1, A2, and B were calculated. Among them, A1 is the partial sieve residue (unit: %) of the aggregate with the largest nominal diameter (nominal diameter of 63mm), A2 is the partial sieve residue (unit: %) of the aggregate with a nominal diameter of 4.75mm, and B is the ratio of A1 to A2.

[0065] Then, weigh the raw materials according to the mix proportion of the concrete to be tested (cement: fly ash: mineral powder: crushed stone: manufactured sand: water: water-reducing agent = 320:60:110:970:800:150:9.8), mix all the raw materials evenly in a mixer, and then gently pour them into the sample cavity 211 of the sample box 210. Before pouring into the sample box 210, a release agent can be applied to the inside of the sample box 210. The sieve 220 should be selected to be close to the maximum nominal particle size of the coarse aggregate, i.e., 63 mm.

[0066] Next, the sample box assembly 200 is installed on the turntable 120, and then the rotary drive mechanism 100 is activated, causing the sample box assembly 200 to rotate in a circular motion. For the first 10 minutes, the baffle 230 is in the installed state. Afterward, the baffle 230 is removed, allowing some concrete to overflow from the screen 220 under centrifugal force. (It should be noted that for concrete with good homogeneity, the relative positions of its components are relatively stable. Even in circular motion, the displacement between components under centrifugal force will be relatively small. However, for concrete with poor homogeneity, the stability of each component is poor. During circular motion, the material with greater mass moves further away from the rotation axis of the turntable 120. Therefore, using the baffle 230 to prevent concrete from overflowing from the screen 220 during the first 10 minutes of operation of the rotary drive mechanism 100 helps improve the reliability of the test results.)

[0067] Next, collect the concrete overflowing from screen 220, rinse with water to retain the aggregate, and dry to constant weight. Then, screen and calculate the partial sieve residue a1 of the aggregate with the largest nominal size and the partial sieve residue a2 of the aggregate with a nominal size of 4.75mm, and calculate the ratio b of a1 to a2.

[0068] Finally, calculate the non-uniformity coefficient α = b / B. If the value of α is between [1, 2], the homogeneity of the concrete is considered to be good; if the value of α is greater than 2, the homogeneity of the concrete is considered to be average.

[0069] Combination Figure 3 and Figure 4In some embodiments, the sample box 210 is provided with a first slot 213, and the baffle 230 is detachably inserted into the first slot 213. This facilitates the installation and removal of the baffle 230.

[0070] In some embodiments, the sample box 210 is provided with a second slot 214, and the sieve 220 is detachably inserted into the first slot 213. This facilitates the replacement and disassembly of the sieve 220.

[0071] It is understandable that there are various types of screens 220, and different types of screens 220 have different mesh sizes. In this way, different types of screens 220 can be selected according to the particle size of the raw materials, thereby improving the applicability of the device.

[0072] like Figure 1 As shown, in some embodiments, the turntable 120 is provided with a groove 1211 extending radially along the turntable 120, and the sample box 210 is provided with a slider 212 disposed in the groove 1211. The sample box 210 is configured to be able to move along the groove 1211 to adjust its position, thereby adjusting the centrifugal force on the concrete in the sample box 210.

[0073] It should be noted that after the position of the sample box 210 is adjusted, the position of the sample box 210 can be fixed with the help of magnets, buckles or other fasteners.

[0074] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0075] Although embodiments of the present invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A concrete homogeneity testing device, characterized by, The application relates to a sample box assembly and a rotary drive mechanism. The sample box assembly is arranged on the rotary disc and is spaced from the rotation axis of the rotary disc, and comprises a sample box with a sample cavity and a screen arranged in the sample box and located on the side of the sample cavity away from the rotation axis of the rotary disc. The side of the sample box away from the rotation axis of the rotary disc is in an open structure.

2. The concrete uniformity testing device of claim 1, wherein, The screen is arranged in the sample box and divides the internal space of the sample box into the sample cavity and a temporary storage cavity located on the side of the screen away from the rotation axis of the rotary disc.

3. The concrete uniformity testing apparatus of claim 1, wherein, The sample box is provided with a dirt discharging port on the side wall of the temporary storage cavity, and the dirt discharging port is provided with a filter screen.

4. The concrete uniformity testing apparatus of claim 3, wherein, The sample box assembly further comprises a baffle, and the baffle has an installed state and a split state; when the baffle is in the installed state, the baffle is close to the side of the screen away from the sample cavity or is arranged on the side of the screen close to the sample cavity.

5. The concrete uniformity testing apparatus of claim 1, wherein, The sample box is provided with a first insertion slot, and the baffle is detachably inserted into the first insertion slot.

6. The concrete uniformity testing apparatus of claim 5, wherein, The rotary disc is provided with a sliding groove extending along the radial direction of the rotary disc, and the sample box is provided with a sliding block arranged in the sliding groove, and the sample box is configured to be movable along the sliding groove to adjust the position thereof.

7. The concrete uniformity testing apparatus of claim 1, wherein, The application further relates to a base, and the base is provided with a mounting hole for mounting the driving source.

8. The concrete uniformity testing apparatus of claim 1, wherein, The rotary disc is located above the base, and the base is provided with a supporting assembly for supporting the rotary disc.

9. The concrete uniformity testing apparatus of claim 8, wherein, The rotary disc comprises a disc bottom and a retaining edge connected to the edge of the disc bottom, and the retaining edge extends upward from the disc bottom.

10. The concrete uniformity testing apparatus of claim 1, wherein, ​

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