Forming device of prismoid test piece, forming device of impervious test piece and use method

Abstract

The invention relates to a forming device of a prismoid test piece, a forming device of an anti-permeability test piece and a using method. The method is suitable for the technical field of concrete durability detection. The technical problem to be solved by the invention is to provide a prismoid test piece forming device, an impervious test piece forming device and a use method. According to the technical scheme, the prismoid test piece forming device comprises a first test mold which is of a cubic structure, an opening is formed in the top of the first test mold, and a cavity communicated with the opening is formed in the first test mold; the bottom of the saddle weight is of a square structure, the saddle weight corresponds to the cavity of the first test mold, and the saddle weight can be embedded into the cavity of the first test mold in a sliding mode so as to be matched with the first test mold to enable roller compacted concrete poured into the cavity to form a test piece main body; one of the two groups of right-angle prisms is symmetrically arranged at the inner bottom of the cavity of the first test mold, the other group of right-angle prisms is symmetrically arranged at the bottom of the saddle weight, and the two groups of right-angle prisms correspond to each other in the vertical direction, so that the test piece main body is of a prismatic structure, and the prismatic test piece is obtained.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of concrete durability detection, and in particular to a prismatic test piece forming device, an impermeable test piece forming device and a use method. BACKGROUND

[0002] The impermeability of concrete refers to the ability of concrete material to resist the penetration of pressure water, which is the most basic factor determining the durability of concrete. Water can penetrate into the interior of concrete, which is a prerequisite for the deterioration of concrete quality caused by reasons such as corrosion of steel bars, freeze-thaw cycle, sulfate attack and alkali aggregate reaction, that is, water can directly cause swelling and cracking, or act as a carrier for the diffusion of erosion medium into the interior of concrete. Therefore, the impermeability of concrete is of great significance to the durability of concrete. Due to the construction method and material characteristics of roller compacted concrete, when layer-by-layer rolling construction is performed, the probability of weak links appearing at the layer surface is greater than that of normal concrete, and these weak links will have a greater impact on the impermeability of the dam concrete, and even pose a greater hidden danger to the safety and durability of the dam.

[0003] In order to evaluate the impermeability of the layer-to-layer combination of roller compacted concrete, the industry standard "Hydraulic Roller Compacted Concrete Test Procedures" DL / T 5433-2024 currently uses the permeability coefficient test, which requires that the test piece be a cube, the layer-to-layer combination be a horizontal surface to simulate the actual rolling surface, the permeability coefficients of the roller compacted concrete body and the layer-to-layer combination be determined, the pressure water flow be allowed to penetrate into the test piece under the action of pressure, the amount of seepage water passing through the test piece be collected and measured, and the concrete permeability coefficient be calculated. However, the industry has been accustomed to evaluating the impermeability of dam concrete in terms of impermeability grade for a long time, which requires that the test piece be a circular truncated cone, and the water pressure be applied vertically to the layer-to-layer combination surface.

[0004] The correlation between the permeability coefficient and the impermeability grade needs to be determined through further tests based on reference to relevant domestic and foreign data, the two indicators are fragmented, the existing test piece cannot meet the geometric structure requirements of both tests, the two types of tests require independent preparation of test pieces, leading to non-homogeneous data and the inability to establish a direct correspondence between the impermeability grade and the permeability coefficient. Therefore, the lack of homogeneous test pieces capable of simultaneously obtaining the permeability coefficient and the impermeability grade hinders the better evaluation of the impermeability of the layer-to-layer combination of roller compacted concrete and the discovery of the corresponding relationship between the two. SUMMARY

[0005] The technical problem to be solved by the present application is to provide a prismatic test piece forming device, an impermeable test piece forming device and a use method in view of the above-mentioned problems.

[0006] The technical solution adopted by the present application is: a prismatic test piece forming device, comprising: The first test mold is in a cubic structure, has an opening at the top, and has a cavity communicating with the opening inside; The weight block has a square structure at the bottom, corresponds to the cavity of the first test mold, can be slidably embedded into the cavity of the first test mold, and cooperates with the first test mold to form a test piece main body of the roller compacted concrete poured into the cavity; The two groups of right triangular prisms are symmetrically arranged at the inner bottom of the cavity of the first test mold and at the bottom of the weight block, and correspond to each other in the vertical direction, so that the test piece main body is in a prism structure, and a prism test piece is obtained.

[0007] Through the above technical means, the right triangular prisms are used to make the internal test piece have an inclined surface, the test mold and the weight block are cooperated to facilitate pouring to form a prism test piece with an inclined surface, the weight block is used to simulate the pressure of the rolling machine, the compaction degree between layers is ensured to meet the actual working condition, and the layered pouring is cooperated to form a layer bonding surface perpendicular to the test piece axis, so that the water pressure is parallel to the layers, the transverse seepage is simulated, and the permeability coefficient test can be performed.

[0008] In some embodiments, the material for manufacturing the test mold includes steel or cast iron.

[0009] Another technical solution adopted by the present application is a forming device for an impermeable test piece, comprising: A forming device for a prism test piece is used to manufacture a prism test piece. The second test mold has a cavity capable of storing the prism test piece, and a filling layer is arranged between the inner wall of the second test mold and the outer wall of the prism test piece to obtain an impermeable test piece in a circular truncated cone structure.

[0010] Through the above technical means, the prism test piece is wrapped by the filling layer, which is convenient for conversion into a circular truncated cone structure, so that the water pressure is perpendicular to the layers, and the impermeability grade test can be performed.

[0011] In some embodiments, the second test mold adopts a cylindrical structure, so that the prism test piece is in the same axis as the second test mold after being placed into the second test mold.

[0012] In some embodiments, the filling layer includes cement mortar, cement slurry, polymer cement mortar, or self-leveling concrete.

[0013] Another technical solution adopted by the present application is a use method of a forming device for an impermeable test piece, comprising the following steps: S1, adding roller compacted concrete into the first test mold, and completing the molding of the lower layer of roller compacted concrete according to the test requirements; S2, pouring the upper layer of roller compacted concrete within a preset layer interval, and completing the molding of the prism test piece according to the test requirements by using the weight block; S3, the prism test piece auxiliary forming device is placed in the preset environment condition for a preset time, and then demolding is carried out, so that the prism test piece is obtained; S4, the prism test piece after demolding is placed into a standard curing chamber for a preset time, and then taken out, a layer of cement paste is wrapped on the surface of the prism test piece, then the prism test piece is centrally placed into a second test mold, the periphery of the prism test piece is filled, after the filling material is hardened, demolding and curing are carried out to the test age, so that the impermeable test piece is obtained.

[0014] In some embodiments, in step S1 or step S2, the lower layer roller compacted concrete or the upper layer roller compacted concrete added in the first test mold adopts two-grade roller compacted concrete or three-grade roller compacted concrete after 40mm screening.

[0015] In some embodiments, in step S1, the molding of the lower layer roller compacted concrete is completed according to the test requirements, and the corresponding compaction thickness of the lower layer roller compacted concrete is set based on whether the prism test piece needs to be treated on the layer surface.

[0016] In some embodiments, the prism test piece obtained by step S3 is sealed on the peripheral surface by using asphalt to define the interlayer permeation area, and the permeability coefficient test is carried out according to the test requirements.

[0017] In some embodiments, the impermeable test piece obtained by step S4 is subjected to the impermeability test or the relative permeability test according to the test requirements.

[0018] The beneficial effects of the present application are: 1, first, the prism test piece is constructed by the prism test piece forming device, the prism test piece obtained has horizontal interlayer inside, which can simulate the actual rolling layer surface and meet the permeability coefficient test requirements, then the prism test piece is subjected to the slurry wrapping treatment, the impermeable test piece with the circular table structure is obtained, the vertical interlayer bonding surface is formed inside, which can ensure that the water pressure acts vertically on the interlayer bonding surface, and meet the requirements of the impermeability test or the relative permeability test. The impermeable test piece constructed by the device can realize the double-mode test of the homologous test piece in sequence, so as to obtain the permeability coefficient and the impermeability grade, thereby the permeability coefficient and the impermeability grade can be used to evaluate the interlayer bonding impermeability performance of the roller compacted concrete, and the interlayer bonding impermeability performance of the roller compacted concrete can be better evaluated. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1 It is the structure schematic diagram of the first test mold in the present application.

[0020] Figure 2 It is the structure schematic diagram of the first test mold in the present application.

[0021] Figure 3 It is the structure schematic diagram of the first test mold in the present application.

[0022] Figure 4 is a structural schematic diagram of a prism specimen in the present application.

[0023] Figure 5 is a structural schematic diagram of an anti-permeability specimen made in the present application.

[0024] BRIEF DESCRIPTION OF DRAWINGS 1. first mold; 2. weight block; 3. right-angle prism; 4. second mold; 5. prism specimen; 6. layer joint; 7. lower layer of roller compacted concrete; 8. upper layer of roller compacted concrete.

[0025] This specification includes reference to“one embodiment” or“the embodiment.” Occurrences of the phrases“in one embodiment” or“in an embodiment” do not necessarily all refer to the same embodiment. Particular features, structures, or characteristics can be combined in any suitable way in one or more embodiments.

[0026] “comprises”, this term is open-ended. As used in the appended claims, this term does not exclude additional structures or steps. Thus, any structure or step not recited in the claims can be combined with the subject matter of the claims.

[0027] “first”,“second”, etc. As used herein, these terms are used as labels for nouns that they directly follow, and do not imply any type of ordering (e.g., spatial, temporal, logical, etc.).

[0028] “based on”, as used herein, this term is used to describe one or more factors that affect a determination. This term does not foreclose additional factors that can affect a determination. That is, a determination can be solely based on those factors or based, at least in part, on those factors. Consider the phrase“determine A based on B”. While in this case, B is a factor that affects the determination of A, such a phrase does not foreclose the determination of A from also being based on C. In other instances, a determination can be made based solely on B. DETAILED DESCRIPTION

[0029] In order to make the technical personnel in the technical field better understand the technical scheme of the present application, the technical scheme of the present application will be further illustrated below in combination with specific examples.

[0030] Example one: In combination with Figures 1 to 4As shown, the embodiment is a prism specimen forming device, which comprises a first test mold 1, a weight block 2 and two groups of right-angle triangular prisms 3. The first test mold 1 is in a cubic structure, the top of the first test mold 1 is provided with an opening, the inside of the first test mold 1 is provided with a cavity communicating with the opening, and the inner bottom of the cavity of the first test mold 1 is provided with a group of symmetrically arranged right-angle triangular prisms 3. The bottom of the weight block 2 is in a square structure, the weight block 2 corresponds to the cavity of the first test mold 1, the weight block 2 can be slidably embedded into the cavity of the first test mold 1, the bottom of the weight block 2 is provided with a group of symmetrically arranged right-angle triangular prisms 3, the right-angle triangular prisms 3 on the first test mold 1 correspond to the right-angle triangular prisms 3 on the weight block 2 in the vertical direction, the weight block 2 cooperates with the first test mold 1, and can make the roller compacted concrete poured into the cavity form a prism specimen 5 in a prism structure.

[0031] In some embodiments, the overall material of the first test mold 1 is steel or cast iron or other materials that do not absorb water and are not prone to deformation.

[0032] Further, in the embodiment, the size specification of the first test mold 1 is 150mm*150mm*150mm cubic, the size specification of the right-angle triangular prism 3 is 62mm in the length of the hypotenuse and 150mm in the horizontal length. The size of the weight block 2 is slightly smaller than the internal size of the first test mold 1, so as to facilitate the embedding of the weight block 2 into the cavity of the first test mold 1. Specifically, in the embodiment, the weight block 2 is in a square shape of 149mm*149mm in plan view, the length of the two right-angle triangular prisms 3 at the bottom of the weight block 2 is 149mm, and the remaining dimensions are consistent with the right-angle triangular prisms 3 at the bottom of the first test mold 1. The total weight of the weight block 2 and the connected right-angle triangular prisms 3 is 11.25kg.

[0033] The right-angle triangular prisms are mainly arranged to form the side surface of the prism specimen, and can also act as part of the upper weight. According to the specification, when the roller compacted concrete is formed, the surface of the concrete needs to maintain a pressure of 4.9kPa, which is generally realized by using a weight block.

[0034] Further, the top of the weight block 2 in the embodiment is also provided with a vertical holding rod. According to the specification, when the roller compacted concrete is formed, the weight block needs to be manually righted or guided by a guide rod. The provision of the holding rod facilitates the use and also provides a guiding effect.

[0035] The implementation principle of the prism specimen forming device of the embodiment is as follows: After pouring the roller compacted concrete, the weight block is pressed to form a prism specimen with a vertical interlayer bonding surface, so as to ensure that the interlayer direction is perpendicular to the axis of the prism specimen. The periphery of the prism specimen is sealed by using asphalt and other sealing materials, so that the water pressure is parallel to the interlayer direction, and the permeability coefficient test of the interlayer bonding surface parallel to the water pressure can be performed.

[0036] Embodiment two: In combinationFigures 3 to 5 As shown, the embodiment is a forming device for an impermeable test piece, which comprises the forming device for the prismatic test piece 5 and the second test mold 4 described in Embodiment One, and the forming device for the prismatic test piece 5 described in Embodiment Two. Figure 3 As shown, the forming device for the prismatic test piece 5 can obtain the prismatic test piece 5. Figure 4 As shown, the forming device for the prismatic test piece 5 can obtain the prismatic test piece 5. Figure 5 As shown, the second test mold 4 is internally provided with a cavity capable of storing the prismatic test piece 5, and a filling layer is arranged between the inner wall of the second test mold 4 and the outer wall of the prismatic test piece 5, so as to obtain an impermeable test piece in a circular truncated cone structure.

[0037] In some embodiments, the second test mold 4 adopts a cylindrical structure, so that after the prismatic test piece 5 is placed into the second test mold 4, the prismatic test piece 5 and the second test mold 4 are in the same axis.

[0038] In some embodiments, the filling layer comprises cement mortar, cement paste, polymer cement mortar, or self-leveling concrete.

[0039] The implementation principle of the forming device for the impermeable test piece in Embodiment One is as follows: For the circular truncated cone impermeable test piece with vertical joint surfaces, the impermeability test and the relative permeability test can be performed to obtain the impermeability grade and the relative permeability coefficient.

[0040] Embodiment Three: The embodiment is a use method of a forming device for an impermeable test piece, which is applied to the forming device for the impermeable test piece in Embodiment Two, and comprises the following steps: S1, adding roller compacted concrete into the first test mold 1, and completing the molding of the lower layer of roller compacted concrete 7 according to the test requirements; S1.1, adding an appropriate amount of secondary roller compacted concrete or tertiary roller compacted concrete after 40mm screening into the first test mold 1, and completing the molding of the lower layer of roller compacted concrete 7 according to the test requirements; specifically, the test requirements in this embodiment are the molding method in the “Hydraulic Roller Compacted Concrete Test Procedure” DL / T 5433-2024; S1.2, completing the molding of the lower layer of roller compacted concrete 7 according to the test requirements, and setting the corresponding compacted thickness of the lower layer of roller compacted concrete 7 based on whether the test piece needs to be treated on the layer surface; specifically, for the test piece treated on the layer surface in this embodiment, the compacted thickness of the lower layer of roller compacted concrete 7 is 70mm, and for the test piece not treated on the layer surface, the compacted thickness of the lower layer of roller compacted concrete 7 is 75mm; S2, pouring the upper layer of roller compacted concrete 8 within the preset interval between layers, and completing the molding of the prismatic test piece 5 by using the weight block 2 according to the test requirements; S2.1, for the test piece subjected to layer treatment, first treat according to the layer treatment requirements, then add an appropriate amount of secondary graded roller compacted concrete or 40mm sieved tertiary graded roller compacted concrete, for the test piece not subjected to layer treatment, directly add an appropriate amount of secondary graded roller compacted concrete or 40mm sieved tertiary graded roller compacted concrete, form a layer joint between the lower roller compacted concrete 7 and the upper roller compacted concrete 8 6, then use the weight block 2, refer to the molding method in the Hydraulic Roller Compacted Concrete Test Procedure DL / T5433-2024 to complete the molding of the prism test piece 5; S3, demold the prism test piece 5 auxiliary molding device after placing it in the preset environmental conditions for a preset time to obtain the prism test piece 5; S3.1, in this embodiment, the preset test piece is 1-3 days, demold the prism test piece 5 auxiliary molding device after placing it in the prescribed environmental conditions for 1-3 days to complete the preparation of the roller compacted concrete interlayer bonding prism test piece 5; S4, place the demolded prism test piece 5 into the standard curing room for a preset time, then take it out, wrap a layer of cement paste on the surface of the prism test piece 5, then place it into the second test mold 4, fill the periphery of the impermeable test piece, demold and cure until the test age, then obtain the impermeable test piece, test the impermeability and permeability coefficient of the impermeable test piece according to the test requirements to obtain the corresponding impermeability grade and permeability coefficient.

[0041] S4.1, in this embodiment, the preset time is 60d, place the demolded roller compacted concrete interlayer bonding prism test piece 5 into the standard curing room for 60d, then take it out, wrap a layer of cement paste on the side surface of the prism test piece 5, then place it into the second test mold 4, fill the periphery with cement mortar, cement paste, polymer cement mortar or self-leveling concrete, demold and cure until the test age, then start the impermeability test according to the Hydraulic Roller Compacted Concrete Test Procedure DL / T 5433-2024.

[0042] In some embodiments, the prism test piece (5) obtained from step S3 is sealed on the peripheral surface with sealing materials such as asphalt to define the interlayer permeation area and conduct the permeability coefficient test according to the test requirements.

[0043] Since the permeability coefficient test needs to simulate the directional horizontal penetration of water along the interlayer weak surface, i.e. parallel to the interlayer direction, it is necessary to avoid water flow from the side of the test piece or non-interlayer area, and eliminate lateral seepage interference. Therefore, when the prism test piece is subjected to interlayer permeability coefficient test, sealing materials such as asphalt are used to strictly limit the permeation path of water flow, ensuring that the test results accurately reflect the interlayer impermeability performance.

[0044] In some embodiments, the anti-permeation test piece obtained from step S4 is subjected to an anti-permeation test or a relative permeability test according to test requirements.

[0045] The implementation principle of the method for using the forming device of the anti-permeation test piece is as follows: Currently, there are two kinds of normal concrete anti-permeation tests, namely, the anti-permeation test (anti-permeation grade) and the relative permeability test (relative permeability coefficient), both of which are aimed at the concrete body. There are two kinds of roller compacted concrete anti-permeation tests, namely, the anti-permeation test (anti-permeation grade) and the permeability coefficient test (permeability coefficient). The former is aimed at the concrete body, and the latter can measure the permeability coefficient of the concrete body and the interlayer. Except for the permeability coefficient test which can use a 150*150*150mm cube test piece, the remaining test pieces are all circular truncated cone bodies with a size of 175*185*150mm.

[0046] In traditional tests, the permeability coefficient test requires the interior of the cube test piece to be a horizontal interlayer, and the anti-permeation grade test requires the interior of the circular truncated cone test piece to be a vertical interlayer, which are mutually exclusive. Therefore, it is necessary to independently prepare the cube and circular truncated cone test pieces. Due to the difference in interlayer structure, the anti-permeation grade and the permeability coefficient cannot be correlated.

[0047] In the present application, the prismatic test piece is obtained through the forming device of the prismatic test piece, and the anti-permeation test piece is obtained through the forming device of the anti-permeation test piece. The original interlayer of the prismatic test piece is in the vertical direction, which not only meets the permeability coefficient test, that is, directly using the prismatic body, the water pressure is parallel to the interlayer in the horizontal direction, but also meets the anti-permeation grade test, that is, after the same prismatic test piece is wrapped and transformed, the water pressure is vertical to the interlayer in the axial direction. By sequentially performing the two types of tests on the same prismatic test piece, the corresponding relationship can be established due to the complete consistency of the interlayer microstructure.

[0048] Although the permeability coefficient and the anti-permeation grade use different test piece shapes, due to the same concrete interlayer structure and the non-destructive transformation process, the data homogeneity can still be ensured. Specifically, the same concrete interlayer structure includes the interlayer in the prismatic test piece and the interlayer in the transformed circular truncated cone test piece, which are the same physical entity, and the wrapped cement slurry only increases the external sealing layer without changing the internal interlayer microstructure, such as porosity and crack distribution. Specifically, the non-destructive transformation process includes that the permeability coefficient test is performed in the state that the sealing material is applied to the side surface of the prismatic test piece; the anti-permeation grade test is performed after the wrapped cement slurry is hardened, and the wrapped layer is only used to adapt to the circular truncated cone mold without affecting the measured interlayer permeability. Therefore, the two tests are aimed at the same group of concrete materials, the same forming process, and the same interlayer interface, only the test methods are different.

[0049] The test equipment for simultaneously carrying out the impermeability test and the relative permeability test is a concrete impermeability tester, and all detection units are equipped with the concrete impermeability tester. However, there is a lack of mature products on the market for a concrete permeability coefficient tester for carrying out the permeability coefficient test. At present, the possession rate of the tester by detection units is extremely low. The molding device in the application can test the impermeability of the interlayer bonding surface of roller compacted concrete at a low cost.

[0050] The above are preferred embodiments of the application, and are not intended to limit the protection scope of the application. Any equivalent changes made according to the structure, shape and principle of the application should be covered within the protection scope of the application.

Claims

1. A forming device for a prismatic test piece, characterized by comprising: The utility model relates to a prism test piece forming device and a prism test piece, and belongs to the field of road engineering. The utility model discloses a prism test piece forming device and a prism test piece, and belongs to the field of road engineering. The utility model relates to a prism test piece forming device and a prism test piece, and belongs to the field of road engineering. The utility model discloses a prism test piece forming device and a prism test piece, and belongs to the field of road engineering.

2. The apparatus of claim 1, wherein: The utility model relates to a prism test piece forming device and a prism test piece, and belongs to the field of road engineering.

3. An apparatus for forming a permeability test piece, characterized by comprising: The utility model relates to a prism test piece forming device and a prism test piece, and belongs to the field of road engineering. The utility model relates to a prism test piece forming device and a prism test piece, and belongs to the field of road engineering. The utility model relates to a prism test piece forming device and a prism test piece, and belongs to the field of road engineering.

4. An apparatus for forming a permeameter test piece according to claim 3, wherein: The utility model relates to a prism test piece forming device and a prism test piece, and belongs to the field of road engineering.

5. An apparatus for forming a permeameter test piece according to claim 3, wherein: The utility model relates to a prism test piece forming device and a prism test piece, and belongs to the field of road engineering.

6. A method of using a device for forming a permeability test piece according to any one of claims 3 to 5, characterized in that, The utility model relates to a prism test piece forming device and a prism test piece, and belongs to the field of road engineering. The utility model relates to a prism test piece forming device and a prism test piece, and belongs to the field of road engineering. The utility model relates to a prism test piece forming device and a prism test piece, and belongs to the field of road engineering. The utility model relates to a prism test piece forming device and a prism test piece, and belongs to the field of road engineering. The utility model relates to a prism test piece forming device and a prism test piece, and belongs to the field of road engineering.

7. The method of using a roller compacted concrete interlayer bond impermeability test specimen assisted forming device according to claim 6, wherein: The utility model relates to a prism test piece forming device and a prism test piece, and belongs to the field of road engineering.

8. The method of using a roller compacted concrete interlayer bond impermeability test specimen assisted forming device of claim 6, wherein: The utility model relates to a prism test piece forming device and a prism test piece, and belongs to the field of road engineering.

9. The method of using a roller compacted concrete interlayer bond impermeability test specimen assisted forming device of claim 6, wherein: The utility model relates to a prism test piece forming device and a prism test piece, and belongs to the field of road engineering.

10. The method of using a roller compacted concrete interlayer bond impermeability test specimen assisted forming device of claim 6, wherein: The utility model relates to a prism test piece forming device and a prism test piece, and belongs to the field of road engineering. The utility model relates to a prism test piece forming device and a prism test piece, and belongs to the field of road engineering. The utility model relates to a prism test piece forming device and a prism test piece, and belongs to the field of road engineering. The utility model relates to a prism test piece forming device and a prism test piece, and belongs to the field of road engineering. The utility model relates to a prism test piece forming device and a prism test piece, and belongs to the field of road engineering. The utility model relates to a prism test piece forming device and a prism test piece, and belongs to the field of road engineering. 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