Device for detecting scouring resistance of concrete protective coating

Abstract

The utility model discloses equipment for detecting the scouring resistance of a concrete protective coating. The equipment comprises an integrated water tank, a test box, a test piece frame, a water pump, a water conveying pipe, a sand barrel and a silt mixing pipe, a test box is fixed above the integrated water tank, and a plurality of groups of test piece racks are arranged in the test box; a water pump and a water conveying pipe are arranged in the integrated water tank, the water inlet end of the water conveying pipe is communicated with the water pump, and a sediment mixing pipe is connected to the water outlet end of the water conveying pipe and arranged above a sample fixing plate of a test piece frame in the test box; a funnel-shaped sand barrel is fixed above the test box, and the outlet end of the sand barrel is communicated with the side wall of the sediment mixing pipe.

Description

Technical Field:

[0001] The utility model relates to the technical field of concrete protective coating detection, in particular to a device for detecting the erosion resistance performance of a concrete protective coating. Background Art:

[0002] Concrete is an indispensable building material for large and small buildings globally. Freeze-thaw and corrosion cause great harm to the quality and service life of concrete projects. For example, the erosion of saline-alkali in coastal areas on concrete, the spalling of concrete caused by freeze-thaw in northern regions, the erosion of acid-base water quality in polluted areas on concrete, the erosion of acid rain, acid fog, and salt fog that may occur everywhere on concrete, and the carbonation spalling of concrete caused by carbon dioxide entering the concrete; after any concrete is spalled, it will affect the appearance of the concrete, and reduce the thickness of the steel bar protection layer, resulting in steel bar corrosion, the concrete around the steel bar becoming loose, and moisture, acid fog, salt fog, carbon dioxide, especially polluted water quality, being extremely easy to invade, causing more serious damage and forming a vicious cycle, posing a hidden danger to project safety and reducing the project service life; to avoid the surface spalling of concrete, steel bar corrosion, and extend the service life of concrete, a "three-resistance" polymer protective coating for waterfront concrete is applied outside the concrete to form a protective coating. The "three-resistance" polymer protective coating for waterfront concrete uses the anti-corrosion and anti-freeze-thaw coating in the existing patent CN201810079479.0, a maintenance construction method for preventing spalling.

[0003] Before the "three-resistance" polymer protective coating for waterfront concrete is sold, its erosion resistance performance needs to be repeatedly tested, and only those that meet the national regulations can be sold; the traditional building exterior wall coating detects the washability performance through a brush washing test with non-pressure clear water. However, the use environment of the "three-resistance" polymer protective coating for waterfront concrete is parts such as concrete river channels, reservoirs, dams, flood discharge channels, spillway weirs, overflow slopes, and stilling basins, which are often washed by water containing sundries such as sediment, and have higher requirements for erosion resistance performance. The brush washing test is not applicable to the detection of the erosion resistance performance of the "three-resistance" polymer protective coating for waterfront concrete. Currently, there is a lack of equipment on the market that specifically detects the anti-erosion performance of this protective coating. Content of the Utility Model:

[0004] The purpose of the utility model is to provide a device for detecting the erosion resistance performance of a concrete protective coating, which solves the problem that the brush washing test of traditional building exterior wall coatings is not applicable to the detection of the erosion resistance performance of the "three-resistance" polymer protective coating for waterfront concrete.

[0005] The purpose of the utility model is implemented by the following technical solution: A device for detecting the erosion resistance performance of a concrete protective coating, which includes an integrated water tank, a test box, a specimen rack, a water pump, a water delivery pipe, a sand bucket, and a sediment mixing pipe;

[0006] Above the integrated water tank, the test chamber is fixed, and several groups of specimen racks are arranged in the test chamber; in the integrated water tank, the water pump and the water delivery pipe are arranged, the water inlet end of the water delivery pipe is communicated with the water pump, and a sediment mixing pipe is connected to the water outlet end of the water delivery pipe. The sediment mixing pipe is placed above the specimen fixing plate of the specimen rack in the test chamber; above the test chamber, the funnel-shaped sand bucket is fixed, and the outlet end of the sand bucket is communicated with the side wall of the sediment mixing pipe.

[0007] Preferably, the specimen rack includes the specimen fixing plate, the connecting plate, the first caster group and the second caster group; the specimen fixing plate is inclined, the connecting plates are respectively hinged to the bottom of the plate surfaces at both ends of the specimen fixing plate, the first caster group is arranged at the bottom of the connecting plate at the top end, and a first slide way matched with the first caster group is arranged on the inner side wall of the test chamber; the second caster group is arranged at the bottom of the connecting plate at the bottom end, and a second slide way matched with the second caster group is arranged on the bottom wall of the test chamber.

[0008] Preferably, a retaining strip is arranged at the bottom edge of the specimen fixing plate.

[0009] Preferably, the water outlet end of the water delivery pipe is placed in the sediment mixing pipe, and a spray head is installed on the water outlet end of the water delivery pipe.

[0010] Preferably, a flow retardation platform is fixed in the integrated water tank, the top surface of the flow retardation platform is a slope, and a filter screen is fixedly arranged between the slope of the flow retardation platform and the top wall of the integrated water tank; the filter screen divides the integrated water tank into a sedimentation tank and a clean water tank, the high end of the flow retardation platform is placed in the clean water tank, and the water pump and the water delivery pipe are both arranged in the clean water tank.

[0011] Preferably, the sediment outlet of the test chamber is communicated with the inside of the sedimentation tank through a sediment mixture conveying pipeline; a flow stabilizing and wave stabilizing net is laid in the sedimentation tank, and the edge of the flow stabilizing and wave stabilizing net extends and fits the inner side wall of the sedimentation tank.

[0012] Preferably, a box door is hinged on the side wall of the test chamber opposite to the first slide way.

[0013] Advantages of the present utility model: A test chamber is provided on the integrated water tank of the present utility model. A sedimentation tank and a purification tank are provided inside the integrated water tank. A specimen rack is installed inside the test chamber, and a specimen is placed on the specimen rack. A sediment mixture pipe is provided above the specimen rack. The sediment mixture pipe is communicated with the purification tank through a water delivery pipe, and the sediment mixture pipe is communicated with a sand bucket through a sand pipe. The sediment mixture is output through the sediment mixture pipe to scour the specimen. The sediment mixture entering the bottom of the test chamber enters the sedimentation tank through the sediment mixture delivery pipeline. The sand is deposited at the bottom of the sedimentation tank, and the upper clear liquid enters the purification tank and is transported to the sediment mixture pipe again through a water pump and a water delivery pipe for reuse, realizing continuous scouring. After the scouring is completed, check the protective coating on the surface of the concrete slab. If there is no damage, it can be regarded as qualified. Brief description of the drawings:

[0014] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present utility model. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0015] Figure 1 It is a schematic structural diagram of Embodiment 1.

[0016] Figure 2 It is Figure 1 A-A cross-sectional view of

[0017] Figure 3 It is Figure 2 A partial enlarged view of B in

[0018] The marks of each component in the drawings are as follows: integrated water tank 1, sedimentation tank 1.1, purification tank 1.2, slow flow platform 1.3, test chamber 2, first slideway 2.1, second slideway 2.2, chamber door 2.3, specimen rack 3, specimen fixing plate 3.1, connecting plate 3.2, first caster group 3.3, second caster group 3.4, retaining bar 3.5, water pump 4, water delivery pipe 5, sand bucket 6, sediment mixture pipe 7, filter screen 8, flow stabilization and wave stabilization net 9, sediment discharge pipeline 10, water volume control valve 11, flow meter 12, pressure gauge 13, pressure regulating valve 14, sand pipe 15, sand volume control valve 16, sediment mixture delivery pipeline 17, corrugated pipe 18. Detailed implementation manners:

[0019] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without making creative efforts shall fall within the protection scope of the present invention.

[0020] Embodiment 1: As Figures 1-3 shown, a detection device for the erosion resistance of a concrete protective coating includes an integrated water tank 1, a test tank 2, a specimen rack 3, a water delivery pipe 5, a sand bucket 6, and a sediment mixing pipe 7; the integrated water tank 1 can separate sand and water. A flow retardation platform 1.3 is fixed in the integrated water tank 1. The two sides of the flow retardation platform 1.3 extend and fit against the inner walls on both sides of the integrated water tank 1. The top surface of the flow retardation platform 1.3 is a slope. The setting of the flow retardation platform 1.3 plays an overflow role on the one hand, enabling the supernatant liquid in the sedimentation tank 1.1 to overflow into the clean water tank 1.2, and on the other hand, it can slow down the water flow rate, so that the un-deposited sand flows back to the sedimentation tank 1.1 along the flow retardation platform 1.3 for sedimentation. A filter screen 8 is fixedly arranged between the slope of the flow retardation platform 1.3 and the top wall of the integrated water tank 1. The setting of the filter screen 8 can intercept sand and prevent sand from entering the clean water tank 1.2; the filter screen 8 divides the integrated water tank 1 into a sedimentation tank and a clean water tank 1.2. The sedimentation tank 1.1 can deposit the sand in the sediment mixture at the bottom of the sedimentation tank 1.1. The high end of the flow retardation platform 1.3 is placed in the clean water tank 1.2; a flow stabilizing and wave suppressing net 9 is laid in the sedimentation tank 1.1. The edge of the flow stabilizing and wave suppressing net 9 extends and fits against the inner side wall of the sedimentation tank 1.1. The setting of the flow stabilizing and wave suppressing net 9 can prevent the sediment mixture from directly impacting the liquid surface of the sedimentation tank 1.1 when entering the sedimentation tank 1.1, causing the static sand in the sedimentation tank 1.1 to fluctuate and be suspended again. A sediment discharge pipeline 10 is communicated with the bottom of the sedimentation tank 1.1, and a sediment discharge valve is arranged on the sediment discharge pipeline 10;

[0021] Above the integrated water tank 1, a test chamber 2 is fixed. The test chamber 2 is used to provide a test space. Inside the test chamber 2, several groups of specimen racks 3 are provided. The specimen racks 3 are used to place specimens. In this embodiment, three specimen racks 3 with adjustable inclination are arranged at intervals inside the test chamber 2. The specimen rack 3 includes a specimen fixing plate 3.1, a connecting plate 3.2, a first caster group 3.3 and a second caster group 3.4. The specimen fixing plate 3.1 is inclined. The specimen fixing plate 3.1 is used to place specimen pieces. A retaining strip 3.5 is provided at the bottom edge of the specimen fixing plate 3.1. The retaining strip 3.5 abuts against the bottom end of the specimen piece to prevent the specimen piece from being separated from the specimen fixing plate 3.1 due to the impact force of the sediment mixture. Connecting plates 3.2 are respectively hinged to the bottom of the plate surfaces at both ends of the specimen fixing plate 3.1 through hinges. A first caster group 3.3 is provided at the bottom of the plate surface of the upper connecting plate 3.2. On the inner side wall of the test chamber 2, a first slideway 2.1 matching the first caster group 3.3 is provided. In this embodiment, two parallel first slideways 2.1 are provided on the inner side wall of the test chamber 2, and two first casters are provided in each first slideway 2.1. A second caster group 3.4 is provided at the bottom of the plate surface of the lower connecting plate 3.2. On the bottom wall of the test chamber 2, a second slideway 2.2 matching the second caster group 3.4 is provided. In this embodiment, two parallel second slideways 2.2 are provided on the inner side wall of the test chamber 2, and two second casters are provided in each second slideway 2.2. Both the first caster and the second caster are flat-top brake polyurethane casters. Manufacturer: Zhejiang Yidel Power Caster Co., Ltd. Both the first caster and the second caster can move along their respective corresponding slideways and have a self-locking function. By moving the first caster and the second caster, the inclination of the specimen fixing plate 3.1 can be adjusted. A chamber door 2.3 is hinged to the side wall of the test chamber 2 opposite to the first slideway 2.1. A handle is fixed on the chamber door 2.3. Open the chamber door 2.3 through the handle and place the specimen on the specimen fixing plate 3.1;

[0022] A water pump 4 and a water pipe 5 are provided in the clean water pool 1.2. The water inlet end of the water pipe 5 is connected to the water pump 4. Water is transported to the sediment mixing pipe 7 through the water pipe 5. A water volume control valve 11, a flow meter 12, a pressure gauge 13 and a pressure regulating valve 14 are provided on the water pipe 5. The water volume control valve 11 controls the water flow, the water pressure is controlled by the pressure regulating valve 14, and the water flow is recorded by the flow meter 12. The water outlet end of the water pipe 5 is connected to the sediment mixing pipe 7. The water outlet end of the water pipe 5 is placed in the sediment mixing pipe 7, and a nozzle is connected to the water outlet end of the water pipe 5 through a bellows 18. The sediment mixing pipe 7 is placed above the sample fixing plate 3.1 in the test box 2. A funnel-shaped sand bucket 6 is fixed above the test box 2. The outlet end of the sand bucket 6 is connected to the side wall of the sediment mixing pipe 7 through a sand pipe 15. The sand is mixed with the sample by mixing the sample with the sample through the sand pipe 15. The sand is transported to the sediment mixing pipe 7 to be mixed with water. The angle of the nozzle can be adjusted through the bellows 18 so that the nozzle is aimed at the sand discharge port of the sand pipe 15, which is conducive to uniform mixing of water and sand. A sand volume control valve 16 is provided on the sand pipe 15. The sand volume control valve 16 controls the flow of sand. The nozzle sprays water to make the sediment mixture spray out from the sediment mixing pipe 7 to flush the sample. The inclination of the sample fixing plate 3.1 is adjusted by moving the first caster and the second caster along their respective corresponding slideways, so that a target flushing angle is formed between the sample fixing plate 3.1 and the nozzle; a sediment outlet is opened on the side wall of the test box 2, and the sediment outlet of the test box 2 is connected to the inside of the sedimentation tank 1.1 through the sediment mixture conveying pipeline 17. The sediment mixture after flushing the sample enters the sedimentation tank 1.1 through the sediment mixture conveying pipeline 17.

[0023] Embodiment 2: A detection method using a concrete protective coating scour resistance detection device of Embodiment 1, comprising the following steps:

[0024] (1) The test surface of a concrete slab with a length, width and thickness of 600*300*25mm is evenly coated with the water-proof concrete "three-resistance" polymer protective coating twice, and cured at room temperature for 15 days to obtain a sample;

[0025] (2) Place the sample on the sample fixing plate 3.1 of the sample rack 3, with the bottom end of the sample abutting against the blocking bar 3.5, move the first caster set 3.3 and the second caster set 3.4, and adjust the inclination of the sample rack 3 so that the flushing angle α between the sample fixing plate 3.1 and the nozzle is 45-60 degrees;

[0026] (3) Start the water pump 4, open the water flow control valve 11 and the sand flow control valve 16, so that water and sand enter the sediment mixing pipe 7, control the water-sand mass ratio to be 10:(1 - 5), open the pressure regulating valve 14, and control the pressure to be stable between 0.5 - 0.55 Mpa. The sediment mixture in the sediment mixing pipe 7 scours the specimen; after scouring, the sediment mixture at the bottom of the test box 2 enters the sedimentation tank 1.1 of the integrated water tank 1 through the sediment mixture conveying pipeline 17. The sand deposits at the bottom of the sedimentation tank 1.1, and the sand deposited at the bottom of the sedimentation tank 1.1 is discharged through the sediment discharge pipeline 10. The upper clear liquid overflows through the slow flow platform 1.3 and is purified by the filter screen 8 and enters the water purification tank 1.2; the water in the water purification tank 1.2 is conveyed to the sediment mixing pipe 7 again through the water pump 4 and the water delivery pipe 5 for reuse, realizing long-term continuous scouring;

[0027] (4) During the scouring process, record the water flow through the flow meter 12. After continuous testing for 20 hours, if the surface coating of the specimen is not damaged, it can be regarded as qualified.

[0028] The above are only the preferred embodiments of the present utility model and are not intended to limit the present utility model. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present utility model shall be included in the protection scope of the present utility model.

Claims

1. A concrete protective coating erosion resistance testing device, characterized in that: It includes an integrated water tank, a test chamber, a test piece rack, a water pump, a water pipe, a sand bucket and a sediment mixing pipe; The test box is fixed above the integrated water tank, and several groups of the specimen racks are arranged in the test box; the water pump and the water pipe are arranged in the integrated water tank, the water inlet end of the water pipe is connected to the water pump, the water outlet end of the water pipe is connected to the sediment mixing pipe, and the sediment mixing pipe is placed above the sample fixing plate of the specimen rack in the test box; the funnel-shaped sand bucket is fixed above the test box, and the outlet end of the sand bucket is connected to the side wall of the sediment mixing pipe.

2. The scour resistance testing equipment for concrete protective coating according to claim 1 is characterized in that: The specimen rack includes the specimen fixing plate, a connecting plate, a first caster group and a second caster group; the specimen fixing plate is arranged at an angle, and the connecting plates are hinged at the bottom of the plate surface at both ends of the specimen fixing plate, respectively; the first caster group is arranged at the bottom of the connecting plate at the top, and a first slideway matched with the first caster group is arranged on the inner side wall of the test box; the second caster group is arranged at the bottom of the connecting plate at the bottom end, and a second slideway matched with the second caster group is arranged on the bottom wall of the test box.

3. The scour resistance testing equipment for concrete protective coating according to claim 2 is characterized in that: The bottom edge of the sample fixing plate is provided with a blocking strip.

4. The scour resistance testing equipment for concrete protective coating according to claim 2 is characterized in that: The water outlet end of the water delivery pipe is placed in the mud and sand mixing pipe, and a nozzle is installed on the water outlet end of the water delivery pipe.

5. The scour resistance testing equipment for concrete protective coating according to claim 1 is characterized in that: A slow flow platform is fixed in the integrated water tank, the top surface of the slow flow platform is a slope, and a filter net is fixed between the slope of the slow flow platform and the top wall of the integrated water tank; the filter net separates the integrated water tank into a sedimentation tank and a clean water tank, the high end of the slow flow platform is placed in the clean water tank, and the water pump and the water pipe are both arranged in the clean water tank.

6. The scour resistance testing equipment for concrete protective coating according to claim 5 is characterized in that: The sediment outlet of the test box is connected to the interior of the sedimentation tank through a sediment mixture delivery pipeline; a flow and wave stabilizing net is laid in the sedimentation tank, and the edge of the flow and wave stabilizing net extends to fit the inner wall of the sedimentation tank.

7. The scour resistance testing equipment for concrete protective coating according to claim 2 is characterized in that: A box door is hinged on the side wall of the test box opposite to the first slideway.

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