CN217992900U - Mould for preparing formed concrete bonding strength test block - Google Patents
Mould for preparing formed concrete bonding strength test block Download PDFInfo
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- CN217992900U CN217992900U CN202222168219.5U CN202222168219U CN217992900U CN 217992900 U CN217992900 U CN 217992900U CN 202222168219 U CN202222168219 U CN 202222168219U CN 217992900 U CN217992900 U CN 217992900U
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Abstract
The utility model discloses a mould for preparing shaping concrete bonding strength test block, include: the groove is defined by four side plates and a bottom plate, and the four side plates are vertically connected with the bottom plate; the inner surfaces of the three side plates are planes, and the inner surface of one side plate is an arc-shaped surface. The utility model provides a mould for shaping concrete bonding strength test block has solved the concrete that intensity level is low when carrying out splitting tensile strength test, and the cube test block is after the splitting, appears the test block easily and smashes and a set of splitting after the uneven scheduling problem of fritter size, when causing the later stage to carry out the bonding strength test, the data fluctuation is great and experimental failure scheduling problem.
Description
Technical Field
The utility model relates to a mould field for preparing shaping concrete bonding strength test block, this mould can be applied to the splitting tensile strength test of survey concrete test block.
Background
In the field of building industry, the physical and mechanical properties of concrete are required to meet certain requirements. When detecting the physical and mechanical properties of concrete, a certain test method is often adopted to detect whether the relevant physical and mechanical property indexes meet the specified requirements. The GB/T50081-2019 concrete physical and mechanical property test method standard specifies a concrete bonding strength test method for evaluating the physical and mechanical properties of concrete. The standard method stipulates that a splitting test needs to be carried out on a cubic test block with the side length of 150mm in the age of 14 days, a small block with the size of about 150mm multiplied by 75mm is obtained, the small block is used and is placed into a mold with the size of 150mm multiplied by 150mm shown in figure 1 again, and new concrete is poured.
However, in the actual operation process, the strength of the concrete test block which is subjected to standard curing for 14 days does not reach a high value. Particularly, when the splitting tensile strength test is performed on concrete with low strength grade, such as C20 to C40 concrete, after a cubic test block with the side length of 150mm is split, problems such as crushing of the test block, uneven size of a group of split small blocks and the like easily occur, and problems such as large data fluctuation, test failure and the like are caused when the bonding strength test is performed in the later period. Therefore, it is urgently needed to develop a mold which can be suitable for concrete with low strength grade, so that the concrete with low strength grade can also be used for testing the physical and mechanical properties by the splitting tensile strength test in GB/T50081-2019 concrete physical and mechanical property test method standard.
SUMMERY OF THE UTILITY MODEL
In order to solve the technical problem, the utility model provides a mould for preparing shaping concrete bonding strength test block has solved the concrete that intensity level is low when carrying out splitting tensile strength test, and the cube test block is after the splitting, and the uneven scheduling problem of fritter size after the test block is smashed and a set of splitting appears easily, when causing the later stage to carry out the bonding strength test, and data fluctuation is great and experimental failure scheduling problem.
In order to solve the technical problem, the utility model provides a mould for preparing shaping concrete bonding strength test block, include:
the groove is defined by four side plates and a bottom plate, and the four side plates are vertically connected with the bottom plate;
the inner surfaces of the three side plates are planes, and the inner surface of one side plate is an arc-shaped surface.
Optionally, the arc surface is wavy, and the arc surface comprises a convex part and a concave part.
Optionally, the protrusion and depression are centrosymmetric.
Optionally, the perpendicular distance between the highest point of the convex part and the lowest point of the concave part is 20mm.
Optionally, one of the convex portions and one of the concave portions are a node, and the arc-shaped surface has 1 to 80 nodes.
Optionally, the bottom plate is 150mm × 75mm in size, and the groove depth is 150mm.
Optionally, the bottom plate is 100mm × 50mm in size, and the groove depth is 100mm.
Optionally, the bottom plate and the side plate can be connected in a detachable mode or a non-detachable mode.
Optionally, the detachable manner is bolt connection, and the non-detachable manner is welding.
Optionally, the side plate of which the inner surface is an arc-shaped surface is of an integrated structure or a composite structure.
The embodiment of the utility model provides a mould for preparing shaping concrete bonding strength test block, compared with the prior art, have following advantage:
the utility model provides a mould for preparing shaping concrete bond strength test block includes the recess, the recess is enclosed by four curb plates and a bottom plate, four curb plates with the bottom plate is perpendicular to be connected, wherein, and is three the internal surface of curb plate is the plane, one the internal surface of curb plate is the arcwall face. When the physical and mechanical properties of the concrete with low strength grade are tested by a splitting tensile strength test in GB/T50081-2019 concrete physical and mechanical property test method standard, the small blocks with concave-convex joint surfaces can be formed by the mould firstly, and when the small blocks are used for continuously pouring the concrete test blocks with the sizes of 150mm multiplied by 150mm, the test data fluctuation of each group can be small, and the test result is more convincing.
Further, the wave type is personally submitted to the arc, the arc includes bellying and depressed part, bellying and depressed part central symmetry can avoid fashioned area unsmooth interface's fritter size inhomogeneous, avoid the data fluctuation who brings from this.
Furthermore, one protruding face and one sunken face is a node, the arcwall face has 1 to 80 nodes, has improved the adhesive strength of later stage concreting and original substrate.
Further, the size of the bottom plate of the groove is 150mm multiplied by 75mm, and the depth of the groove is 150mm; or the size of the bottom plate of the groove is 100mm multiplied by 50mm, the depth of the groove is 100mm, the moulds of different sizes can be conveniently arranged and selected according to different types of concrete, the fluctuation of the test data of each group can be ensured to be small, and the test result is more convincing.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are drawings in some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
Fig. 1 is a schematic structural diagram of a mold for preparing a molded concrete bonding strength test block in the prior art.
Fig. 2 is a schematic perspective view of a mold for preparing a molded concrete bonding strength test block according to an embodiment of the present invention.
Fig. 3 is a schematic top view of a mold for preparing a test block for bonding strength of formed concrete according to an embodiment of the present invention.
Fig. 4 is a schematic structural diagram of an arc surface in an embodiment of the present invention.
Reference numerals are as follows:
1-a mould;
10-a mould for preparing a formed concrete bonding strength test block;
100-grooves;
101,102,103, 104-side plates; 105-a backplane; 106-arc-shaped surface; 106 a-a boss; 106 b-recess.
Detailed Description
In order to make the technical field better understand the solution of the present invention, the following detailed description of the present invention is provided with reference to the accompanying drawings and the detailed description. It is to be understood that the embodiments described are only some embodiments of the invention, and not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
As described in the prior art, in the field of construction industry, the concrete bonding strength test method specified in GB/T50081-2019 test method Standard for physical and mechanical Properties of concrete is often adopted to evaluate the physical and mechanical properties of concrete. However, in the actual operation process, the strength of the concrete test block which is subjected to standard curing for 14 days does not reach a high value. Particularly, when the splitting tensile strength test is performed on concrete with low strength grade, such as C20 to C40 concrete, after a cubic test block with the side length of 150mm is split, problems such as crushing of the test block, uneven size of a group of split small blocks and the like easily occur, and problems such as large data fluctuation, test failure and the like are caused when the bonding strength test is performed in the later period.
The strength of the C20-C40 concrete is determined according to GB50010-2020 concrete structure design Specification, for example, the strength is determined in GB50010-2020 concrete structure design SpecificationC20 represents the strength grade of the concrete as C20, and f is more than or equal to 20MPa cu (concrete Standard cube compressive Strength)<25MPa; c25 represents the strength grade of the concrete as C25, and f is more than or equal to 25MPa cu <30MPa; c30 represents the strength grade of the concrete as C30, and f is more than or equal to 30MPa cu <35MPa; c35 represents the strength grade of the concrete as C35, and f is more than or equal to 35MPa cu <40MPa; … …; c40 represents the strength grade of the concrete as C40, and f is more than or equal to 40MPa cu <45MPa。
In order to solve the technical problem, the utility model provides a mould for shaping concrete bonding strength test block includes the recess, the recess is enclosed by four curb plates and a bottom plate, four curb plates with the bottom plate is connected perpendicularly, and wherein, three the internal surface of curb plate is the plane, one the internal surface of curb plate is the arcwall face.
It should be noted that the utility model discloses the mould range of application is wider, does not have special requirement to the intensity of concrete, and the concrete that intensity grade is low or the concrete that intensity grade is high all can be suitable for. When the physical and mechanical properties of the concrete are tested by a splitting tensile strength test in GB/T50081-2019 concrete physical and mechanical property test method standard, the mould can be used for forming a small block with a concave-convex joint surface firstly, and when the small block is used for continuously pouring the concrete sample with the thickness of 150mm multiplied by 150mm at the later stage, the test data of each group can be enabled to have small fluctuation, and the test result is more convincing.
In order to make the above objects, features and advantages of the present invention more comprehensible, the present invention is described in detail with reference to the accompanying drawings and the detailed description thereof.
As follows, the utility model provides a mould for preparing shaping concrete bonding strength test block.
Fig. 2 is a schematic perspective view of a mold for preparing a molded concrete bonding strength test block according to an embodiment of the present invention; fig. 3 is a schematic top view of a mold for preparing a molded concrete bond strength test block according to an embodiment of the present invention; fig. 4 is a schematic structural diagram of an arc surface in an embodiment of the present invention.
Referring to fig. 2, the present invention provides a mold 10 for preparing a formed concrete bonding strength test block, comprising: a recess 100, said recess 100 being defined by four side panels 101,102,103,104 and a bottom panel 105, said four side panels 101,102,103,104 being connected perpendicularly to said bottom panel 105; the inner surfaces of the three side plates 101,102 and 103 are flat surfaces, and the inner surface of one side plate 104 is an arc-shaped surface.
In particular, in use, the groove 100 can be used for accommodating concrete and preparing a small formed concrete block, and the small block can be used for continuously pouring a concrete test block of 150mm × 150mm × 150mm at a later stage. Because the inner surfaces of the three side plates 101,102 and 103 in the groove 100 are planes and one inner surface of the side plate 104 is an arc surface 106, the utility model discloses the formed concrete nub prepared by the mould has concave-convex joint surfaces, when the formed concrete nub is used for pouring the concrete test block of 150mm x 150mm to carry out physical and mechanical properties, the test data fluctuation of each group can be small, and the test result has more convincing power.
In addition, it should be noted that the bottom plate 105 and the side plates 101,102,103,104 of the present invention can be connected in a detachable manner or a non-detachable manner, the detachable connection manner can be a bolt fastening connection, and the non-detachable connection manner can be a welding fastening connection.
Further, the side plate 104 having the arc-shaped inner surface may be a unitary structure or a composite structure. The composite structure can be formed by combining a plate with an arc-shaped inner surface and a plate with a plane inner surface, and the plate can be combined in a splicing mode through a die.
Further, the utility model discloses the material of mould can be timber, steel, aluminum product, copper product and silica gel mould etc. when the curb plate that the internal surface is the arcwall face is composite construction, the utility model discloses the material of mould also can be the assembly of several kinds of materials, for example the combination of steel mould and the silica gel mould that has unsmooth arcwall face, or the combination of wood mould and the silica gel mould that has unsmooth arcwall face etc..
Referring to fig. 3, in some embodiments, the arc surface 106 is wavy, and the arc surface 106 includes a convex portion 106a and a concave portion 106b, so as to facilitate the formation of a good bond between each small block and the newly poured concrete.
In some embodiments, the convex portion 106a and the concave portion 106b are symmetric with respect to the center, so as to avoid non-uniform sizes of the small pieces with concave-convex interfaces, thereby avoiding data fluctuation.
Referring to fig. 4, in some embodiments, the vertical distance between the highest point of the protrusion 106a and the lowest point of the recess 106b is 20mm.
It can be understood that, under the circumstances of the raised portion 106a and the depressed portion 106b central symmetry, when the perpendicular distance of the highest point of the raised portion 106a and the lowest point of the depressed portion 106b is 20mm, the distance between the raised portion 106a and the depressed portion 106b and the central line is 10mm, which ensures the uniform size of the small blocks with the concave-convex interface of the molding prepared by the mold of the utility model, and avoids the fluctuation of the data brought thereby.
In some embodiments, one of the protrusions 106a and one of the recesses 106b are a node, and the arcuate surface 106 has 1 to 80 nodes.
In some embodiments, the floor 105 is 150mm by 75mm in size, and the groove 100 is 150mm deep; in other embodiments, the floor 105 is 100mm by 50mm in size and the groove 100 is 100mm deep. The moulds of different sizes are convenient to set and can be selected according to different types of concrete, fluctuation of test data of each group can be guaranteed to be small, and test results are more convincing. It should be noted that, if a small block is prepared by using a mold having a bottom plate size of 100mm × 50mm and a groove depth of 100mm, the overall size of the test block to be tested is 100mm × 100mm × 100mm, and the concrete bonding strength obtained by the test needs to be calculated by referring to the calculation method in the concrete bonding strength test specified in "GB/T50081-2019 concrete physical and mechanical property test method standard", and then multiplied by a size conversion coefficient of 0.85 to obtain a test result.
The advantages of the present invention will be further illustrated by the following specific practical operation method.
1. Concrete and its production method
The concrete to be tested is C40 concrete, the strength grade of the C40 concrete is C40, and f is more than or equal to 40MPa cu (concrete Standard cube compressive Strength)<45MPa。
The post-cast concrete is C50 concrete, the strength grade of the C50 concrete is C50, and f is more than or equal to 50MPa cu (concrete Standard cube compressive Strength)<55MPa。
2. Die set
The utility model discloses the mould is enclosed by four curb plates and a bottom plate, and four curb plates are connected with the bottom plate is perpendicular, and the mould bottom plate is 150mm 75mm, and the depth of groove is 150mm, and bellying and depressed part central symmetry, the maximum of bellying and the perpendicular distance of the minimum of depressed part are 20mm, and the arcwall face has 3 nodes.
The prior art mould is a cube mould with the side length of 150mm.
3. Test method
The test method refers to the splitting tensile strength test in GB/T50081-2019 concrete physical and mechanical property test method Standard, and is not described herein again. Wherein, the standard group is for using prior art mould preparation test block to test the bonding strength of concrete, the utility model discloses group is for using the utility model discloses mould preparation test block to test the bonding strength of concrete, the standard group with the utility model discloses organize 1 groups of each parallel arrangement.
Preparing a test block by using a mold in the prior art:
(1) C40 concrete with the thickness of 150mm is poured in a mould in the prior art;
(2) Demoulding, standard curing for 14 days, and molding to obtain 150mm cubic test blocks (3 blocks/group);
(3) Splitting the sample by using splitting equipment to form 6 small blocks of 75mm multiplied by 150mm;
(4) Removing impurities, and wetting the surfaces of the small blocks with water;
(5) Placing the 6 small blocks into 6 cube molds with the side length of 150mm respectively, and pouring C50 concrete;
(6) Demoulding after 1 day, and curing for 28 days to obtain the test block.
Use the utility model discloses mould preparation test block:
(1) Concrete with the thickness of 150mm is poured in the mould;
(2) Demoulding, standard curing for 14 days, and molding to obtain small blocks (with arc shape) of 75 × 150mm (6 blocks/group);
(3) Removing impurities, and wetting the surfaces of the small blocks with water;
(4) Placing the small blocks into a cube mold with the side length of 150mm, and pouring C50 concrete;
(5) Demoulding after 1 day, and curing for 28 days to obtain the formed concrete bonding strength test block.
Will use the test block of prior art mould preparation respectively with the utility model discloses the test block of mould preparation is arranged in and is tested and calculate under the compression testing machine, obtains concrete bond strength test result.
4. Test results
Table 1 test block prepared by prior art mold and the utility model discloses the test result of the adhesive strength of the test block prepared by mold
For the concrete with lower intensity grade, like this example to await measuring concrete-C40 concrete, when preparing the test block with current mould, the cube test block that the length of side is 150mm after the splitting, the condition that part test block is smashed and the little size after the splitting is inhomogeneous has appeared, and use the utility model discloses the test block of mould preparation then does not take place above-mentioned condition.
As can be seen from the results of the test block for the bonding strength, 4 data exist when the deviation of the 6 groups of data in the standard group and the mean value is higher than 15%, 2 data exist when the deviation is higher than 30%, and the reliability of the whole data is not high; and the utility model discloses the deviation of 6 data of group and mean value all does not exceed 15%, and data credibility is high. From the volatility comparison, the standard deviation for the obvious standard group was 0.74, which is greater than the standard deviation of the inventive group of 0.27. The aforesaid shows, use the utility model discloses the mould is used for preparing shaping concrete bond strength test block, makes the concrete that the intensity level is low, when testing its physical mechanical properties with the splitting tensile strength test in GB/T50081-2019 concrete physical mechanical properties test method standard, can make the test data fluctuation of every group little, and the test result more has convincing power.
Although the present invention is disclosed above, the present invention is not limited thereto. Various changes and modifications may be effected by one skilled in the art without departing from the spirit and scope of the invention, as defined in the appended claims.
Claims (10)
1. A mould for preparing shaping concrete bond strength test block which characterized in that includes:
the groove is defined by four side plates and a bottom plate, and the four side plates are vertically connected with the bottom plate;
the inner surfaces of the three side plates are planes, and the inner surface of one side plate is an arc-shaped surface.
2. The mold for preparing a shaped concrete bond strength test block according to claim 1, wherein the arc-shaped surface is wavy, and the arc-shaped surface comprises a convex portion and a concave portion.
3. The mold for manufacturing a molded concrete bond strength test block according to claim 2, wherein the convex portion and the concave portion are centrosymmetric.
4. The mold for producing a molded concrete bond strength test block according to claim 2 or 3, wherein the vertical distance between the highest point of the convex portion and the lowest point of the concave portion is 20mm.
5. The mold for manufacturing a molded concrete bond strength test block according to claim 2, wherein one of the convex portions and one of the concave portions are one node, and the arc-shaped face has 1 to 80 nodes.
6. The mold for manufacturing a molded concrete bond strength test block according to claim 1, wherein the size of the bottom plate is 150mm x 75mm, and the depth of the groove is 150mm.
7. The mold for manufacturing a molded concrete bond strength test block according to claim 1, wherein the size of the bottom plate is 100mm x 50mm, and the depth of the groove is 100mm.
8. The mold for preparing a shaped concrete bond strength test block according to claim 1, wherein the bottom plate and the side plate are detachably or non-detachably connected.
9. The mold for manufacturing a test block for bonding strength of molded concrete according to claim 8, wherein the detachable manner is bolt connection and the non-detachable manner is welding.
10. The mold for manufacturing a test block for bonding strength of molded concrete according to claim 1, wherein the side plate having the inner surface of the arc-shaped face is of an integrated structure or a composite structure.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222168219.5U CN217992900U (en) | 2022-08-17 | 2022-08-17 | Mould for preparing formed concrete bonding strength test block |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222168219.5U CN217992900U (en) | 2022-08-17 | 2022-08-17 | Mould for preparing formed concrete bonding strength test block |
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| CN217992900U true CN217992900U (en) | 2022-12-09 |
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| CN202222168219.5U Active CN217992900U (en) | 2022-08-17 | 2022-08-17 | Mould for preparing formed concrete bonding strength test block |
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