Single-sided freeze-thaw test device for concrete surface coating

Abstract

The present invention discloses a single-sided freeze-thaw test device for concrete surface coatings, comprising: a freeze-thaw chamber, wherein the freeze-thaw chamber is provided with a water chamber and an antifreeze liquid chamber that are not connected to each other; a water control system, wherein the water control system is connected to the water chamber; a freeze-thaw circulation system, wherein the freeze-thaw circulation system is connected to the antifreeze liquid chamber; a pressure system, wherein the pressure system is pressed against the upper end surface of the freeze-thaw chamber; a base and a spherical seat, wherein the upper end surface of the base is provided with a spherical groove; the lower end of the spherical seat is spherical, and the upper end of the spherical seat is flat, wherein one end of the spherical shape fits into the spherical groove of the base in a fitting manner, and a sample is placed on the flat surface of the upper end of the spherical seat; the lower end surface of the freeze-thaw chamber is provided with a sealing groove, wherein a sealing ring is installed in the sealing groove, and the lower end surface of the freeze-thaw chamber is pressed against the coating on the upper end surface of the sample; the bottom of the water chamber is an open opening, the open opening directly faces the coating, and the sealing ring is located outside the open opening. The freeze-thaw cycle test is carried out by the present invention to detect the frost resistance of concrete coatings, and the effect is significant, and the device is suitable for application and promotion.

Description

Technical Field

[0001] The invention relates to the technical field of concrete surface coating testing, in particular to a single-side freeze-thaw testing device for concrete surface coating. Background Art

[0002] Considering that there is currently no single-sided freeze-thaw test device for concrete coatings, and the current requirements for the anti-freeze performance of physical buildings are becoming increasingly higher, especially in the cold coastal areas of the north, there is currently no good equipment to assist in the anti-freeze performance testing of coatings on physical buildings that are brand new or have been in operation for decades.

[0003] Application No. 201710733142.2, filed on August 24, 2017, discloses a concrete freeze-thaw test device and method, comprising a test chamber comprising an upper chamber and a lower chamber; a third hydraulic cylinder secured to an isolation plate; a U-shaped groove fixed to the telescopic end of the third hydraulic cylinder; a feeding device disposed on the top surface of the upper chamber; an adjustment mechanism secured to the top surface of the test chamber; first and second hydraulic cylinders secured to the side walls of the upper chamber; a first extrusion block secured to the telescopic end of the first hydraulic cylinder; a second extrusion block secured to the telescopic end of the second hydraulic cylinder; pressure measuring devices secured between the first extrusion block and the inner side wall of the chamber, and between the second extrusion block and the inner side wall of the chamber, respectively; a cooling fan secured within the upper chamber; and an electrical box secured to the upper side wall of the test chamber. The invention has the beneficial effects of high intelligence, convenient operation, good test results, and a relatively simple test method.

[0004] Application number: 201310737721.6, application date: 2013-12-28 Disclosed is a concrete rapid freeze-thaw and unilateral freeze-thaw integrated testing machine, comprising a main box; a specimen box, a heating device, a refrigeration device and a water pump are arranged in the main box; a grille and a unilateral freeze-thaw test box are detachably provided in the specimen box; at least two infrared sensors of different heights are arranged in the inner wall of the specimen box; a square-shaped guide pipe is also provided in the specimen box; a plurality of liquid outlets communicating with the guide pipe are opened on the inner wall of the guide pipe; the apertures of the liquid outlets increase in sequence from closer to farther from the liquid inlet; The concrete rapid freeze-thaw and unilateral freeze-thaw integrated testing machine can perform both freeze-thaw tests and unilateral freeze-thaw tests on concrete specimens. One testing machine can perform both tests, greatly reducing testing costs; at the same time, the temperature uniformity in the specimen box is improved, thereby avoiding temperature differences between multiple concrete specimens, making the test data more accurate and reliable.

[0005] Application No. 201210591103.0, Application Date: 2012-12-29 Disclosed is a single-sided freeze-thaw tester for concrete, comprising a specimen box, a heat dissipation system, a control cabinet, and an insulation layer. The insulation layer is provided on the peripheral wall and below the specimen box and is filled with foam. A cooling trough is horizontally provided in the middle of the insulation layer below the specimen box. An input pipe is connected to the bottom of one end of the cooling trough, and an output pipe is connected to the side of the other end. The input and output pipes are connected via a water pump. A solenoid valve group is provided at the bottom of the heat dissipation system, comprising three solenoid valves arranged side by side. A first end of the solenoid valve group is connected to the specimen box, and a second end of the solenoid valve group is connected to the cooling trough. The cooling trough can pre-cool the specimen box to reduce its temperature, and the solenoid valve can replenish cooling water in the cooling trough to balance the deviation between the target temperature and the actual temperature in the specimen box, thereby greatly improving the temperature accuracy in the specimen box.

[0006] Application number: 201920314763.1, filing date: 2019-03-12 Disclosed is a concrete block freeze-thaw tester. The technical solution mainly includes a box, a specimen box, a conductive liquid located outside the specimen box, a heating pipe connected to the inner cavity of the box, a heating pipe connected to a heating and insulation box, a cooling pipe connected to the inner cavity of the box, and a cooling pipe connected to the cooling and insulation box; a three-way joint connecting the heating and cooling pipes, the other end of which is connected to a two-way pump; a heating ventilation pipe connected to the inner cavity of the box, a heating electromagnetic control valve connected to the heating ventilation pipe connected to the heating and insulation box; and a cooling ventilation pipe connected to the inner cavity of the box, a cooling electromagnetic control valve connected to the cooling and insulation box. This solves the problem of high energy consumption caused by the need to heat or cool the same part of the temperature control medium during use of the freeze-thaw tester.

[0007] Application number: 201910391992.8, filing date: May 13, 2019. A concrete durability testing device under freeze-thaw-load synergy includes a testing device, a constant hydraulic source device, and a control circuit. The testing device comprises a freeze-thaw chamber, a specimen chamber, a jack, a movable pressure plate, a limit rod, an electric cooling unit, and an electric heating unit. A concrete specimen is placed in the specimen chamber, with the limit rods limiting the position of the concrete specimen on both sides. The jack is located at the top of the freeze-thaw chamber. Water inlet and outlet pipes are provided on the specimen chamber, and freeze-thaw liquid inlet and outlet pipes are provided on the freeze-thaw chamber. The concrete durability testing method of the present invention includes: a) preparing the specimen; b) placing the specimen; c) connecting the equipment; d) applying a constant load; e) introducing water and freeze-thaw liquid; f) controlling the freeze-thaw cycle; and g) testing and analysis. The concrete durability testing device of the present invention can automatically conduct freeze-thaw-load synergy tests on concrete specimens, achieving significant benefits and being suitable for widespread application.

[0008] The technical solutions, technical problems to be solved and beneficial effects produced by the above-mentioned disclosed technologies are all different from the present invention. Regarding more technical features, technical problems to be solved and beneficial effects of the present invention, the above-mentioned disclosed technical documents do not provide any technical inspiration. Summary of the Invention

[0009] The present invention aims to provide a single-sided freeze-thaw test device for concrete surface coatings. This device allows for on-site coring of the concrete surface coating, retaining the concrete coating, and then conducting freeze-thaw cycle tests to test the frost resistance of the concrete coating. The device demonstrates significant results and is suitable for widespread application. Field samples or molded samples are placed on a spherical seat to ensure the sample coating is positioned horizontally. The freeze-thaw chamber's two-layer sealing ring further ensures the freeze-thaw device's tightness.

[0010] In order to achieve the above object, the present invention adopts the following technical solutions:

[0011] Concrete surface coating single-side freeze-thaw test device, including:

[0012] A freeze-thaw box, wherein the freeze-thaw box is provided with a water chamber and an antifreeze liquid chamber which are not connected to each other;

[0013] a water control system, the water control system being in communication with the water cavity;

[0014] a freeze-thaw circulation system, the freeze-thaw circulation system being in communication with the antifreeze liquid chamber;

[0015] A pressure system, the pressure system pressing on the upper end surface of the freeze-thaw chamber;

[0016] It also includes a base and a spherical seat, wherein the upper end surface of the base is provided with a spherical groove; the lower end of the spherical seat is spherical, and the upper end of the spherical seat is flat, wherein one end of the spherical seat fits into the spherical groove of the base, and the sample is placed on the flat surface of the upper end of the spherical seat;

[0017] A sealing groove is provided on the lower end surface of the freeze-thaw box, a sealing ring is installed in the sealing groove, the lower end surface of the freeze-thaw box is pressed on the coating on the upper end surface of the sample, the bottom of the water cavity is an open opening, the open opening directly faces the coating, and the sealing ring is located on the periphery of the open opening.

[0018] Furthermore, the sealing groove is an annular sealing groove, and at least two sealing grooves are provided.

[0019] Furthermore, the antifreeze liquid cavity is surrounded by the periphery of the water cavity.

[0020] Furthermore, the pressure application system includes:

[0021] A hydraulic cylinder, wherein a power output end of the hydraulic cylinder presses against an upper end surface of the freeze-thaw box;

[0022] A hydraulic control system, wherein the power input end of the hydraulic cylinder is connected to the hydraulic control system.

[0023] Furthermore, the water control system includes:

[0024] A water supply pump, wherein the water supply pump outlet is connected to the water cavity inlet and outlet pipes, and the ends of the water inlet and outlet pipes are sealed and pass through the freeze-thaw box wall to communicate with the water cavity inside the freeze-thaw box;

[0025] A drainage pump, wherein the water inlet of the drainage pump is connected to a drainage pipe, and the drainage pipe is further connected to a radial opening in the middle of the inlet and outlet pipes.

[0026] Furthermore, a valve is installed at the outlet of the water supply pump, and a valve is installed at the inlet of the drainage pump.

[0027] Furthermore, the freeze-thaw cycle system comprises:

[0028] A circulating pump, wherein the liquid outlet of the circulating pump is connected to the starting end of the liquid inlet pipe, the end of the liquid inlet pipe is sealed and passes through the freeze-thaw box wall to communicate with the antifreeze liquid chamber inside the freeze-thaw box, and the liquid inlet of the circulating pump is connected to the liquid outlet of the antifreeze tank;

[0029] An antifreeze liquid tank, wherein the return port of the antifreeze liquid tank is connected to the end of a drain pipe, and the starting end of the drain pipe is sealed through the freeze-thaw tank wall and communicates with the antifreeze liquid chamber inside the freeze-thaw tank;

[0030] An electric heating jacket, which is installed on one side of the outer wall of the antifreeze tank;

[0031] The electric condensing sleeve is arranged on the outer wall of the other side of the antifreeze tank.

[0032] Furthermore, the liquid inlet pipe and the liquid discharge pipe are wrapped with a heat-insulating layer.

[0033] Furthermore, the antifreeze tank is equipped with a temperature sensor facing the electric heating jacket; the antifreeze tank is also equipped with a temperature sensor facing the electric condensing jacket.

[0034] Furthermore, the electric heating jacket, the electric condensing jacket, and the two temperature sensors are all connected to a temperature control system.

[0035] Compared with the prior art, the present invention has the following beneficial effects:

[0036] Place the field sample or molded sample on the spherical seat to ensure that the sample coating is placed horizontally.

[0037] The two-layer sealing ring of the freeze-thaw box can better ensure the sealing of the freeze-thaw device.

[0038] A constant force of 80KN is applied through the hydraulic system to ensure that the freeze-thaw box will not have its sealing performance reduced due to micro-deformation during the freeze-thaw process.

[0039] Water control system: The present invention realizes the freeze-thaw test of the concrete surface coating through the freezing and thawing of water. Water is injected into the freeze-thaw device through the inlet and outlet pipes. The position of water is maintained at 2 / 3 of the water space. Considering that the density of water changes from approximately 1g / cm3 to approximately 0.9 g / cm3 when it freezes, the volume increases by 1 / 9. If it is filled with water, the ice will cause stress damage to the coating when it freezes, and it will be impossible to determine whether the damage to the coating is freeze-thaw damage or stress damage. In order to prevent such situations, or considering the injection of other liquids into the water space in the future, a conservative choice of 2 / 3 can achieve the purpose of meeting the conditions. At the end of the test, the internal water is discharged. Considering that there will be a certain pressure when pumping water, the drain outlet is designed to be kept above the coating to prevent the coating from being affected by the pumping pressure.

[0040] Freeze-thaw cycle system: This invention uses the antifreeze's low-temperature, non-freezing property as a conductor for water temperature transmission. The freeze-thaw cycle system sets the freeze-thaw frequency and time, and the antifreeze circulates to maintain the test temperature of the freeze-thaw device. Insulation cotton is wrapped around the freeze-thaw cycle's inlet and outlet pipes to prevent temperature loss during the cycle.

[0041] The present invention can obtain concrete with a surface coating by on-site coring, and perform freeze-thaw cycle tests to detect the frost resistance of the concrete coating. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] Figure 1 It is a structural schematic diagram of the single-sided freeze-thaw test device for concrete surface coating of the present invention.

[0043] In the figure: base 1; spherical groove 2; spherical seat 3; sample 4; coating 5; freeze-thaw box 6; water chamber 7; antifreeze chamber 8; sealing ring 9; hydraulic cylinder 10; hydraulic control system 11; water supply pump 12; water supply pump inlet 13; water chamber inlet and outlet pipes 14; drainage pump 15; drainage pump outlet 16; drainage pipe 17; circulating pump 18; liquid inlet pipe 19; liquid discharge pipe 20; insulation layer 21; antifreeze tank 22; electric heating jacket 23; temperature sensor 24; temperature control system 25; electric refrigeration jacket 26; temperature sensor 27. DETAILED DESCRIPTION

[0044] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0045] See also Figure 1 , the present invention provides a technical solution:

[0046] Concrete surface coating single-side freeze-thaw test device, including:

[0047] A freeze-thaw box 6, wherein the freeze-thaw box is provided with a water chamber 7 and an antifreeze liquid chamber 8 which are not connected to each other;

[0048] a water control system, the water control system being in communication with the water cavity;

[0049] a freeze-thaw circulation system, the freeze-thaw circulation system being in communication with the antifreeze liquid chamber;

[0050] A pressure system, the pressure system pressing on the upper end surface of the freeze-thaw chamber;

[0051] The apparatus further comprises a base 1 and a spherical seat 3, wherein a spherical groove 2 is provided on the upper end surface of the base; the lower end of the spherical seat is spherical, and the upper end of the spherical seat is flat, wherein one end of the spherical seat fits into the spherical groove of the base, and a sample 4 is placed on the flat surface of the upper end of the spherical seat;

[0052] A sealing groove is provided on the lower end face of the freeze-thaw box, and a sealing ring 9 is installed in the sealing groove. The lower end face of the freeze-thaw box is pressed on the coating on the upper end face of the sample. The bottom of the water chamber is an open opening, and the open opening directly faces the coating 5. The sealing ring is located on the periphery of the open opening.

[0053] Furthermore, the sealing groove is an annular sealing groove, and at least two sealing grooves are provided.

[0054] Furthermore, the antifreeze liquid cavity is surrounded by the periphery of the water cavity.

[0055] Furthermore, the pressure application system includes:

[0056] A hydraulic cylinder 10, wherein the power output end of the hydraulic cylinder presses against the upper end surface of the freeze-thaw box;

[0057] The hydraulic control system 11, the power input end of the hydraulic cylinder is connected to the hydraulic control system. The hydraulic control system belongs to the existing technology or well-known technology in this technical field and can be directly applied without further explanation.

[0058] Furthermore, the water control system includes:

[0059] A water supply pump 12, the water outlet of which is connected to the water cavity inlet and outlet pipes 14, the ends of which are sealed and pass through the freeze-thaw box wall to communicate with the water cavity inside the freeze-thaw box;

[0060] A drainage pump 15, wherein the water inlet of the drainage pump is connected to a drainage pipe 17, and the drainage pipe is further connected to the inlet and outlet pipes with radial openings in the middle.

[0061] Furthermore, a valve is installed at the outlet of the water supply pump, and a valve is installed at the inlet of the drainage pump.

[0062] Furthermore, the freeze-thaw cycle system comprises:

[0063] A circulating pump 18, the liquid outlet of the circulating pump is connected to the beginning of a liquid inlet pipe 19, the end of the liquid inlet pipe is sealed through the freeze-thaw tank wall and communicates with the antifreeze liquid chamber inside the freeze-thaw tank, and the liquid inlet of the circulating pump is communicated with the liquid outlet of the antifreeze tank;

[0064] An antifreeze liquid tank 22, the liquid return port of which is connected to the end of the drain pipe 20, and the starting end of the drain pipe is sealed through the freeze-thaw tank wall and communicates with the antifreeze liquid chamber inside the freeze-thaw tank;

[0065] An electric heating jacket 23, which is installed on one side of the outer wall of the antifreeze tank;

[0066] The electric condenser sleeve 26 is installed on the other outer wall of the antifreeze tank.

[0067] Furthermore, the liquid inlet pipe and the liquid discharge pipe are wrapped with a heat-insulating layer 21 on the outside.

[0068] Furthermore, the antifreeze tank is equipped with a temperature sensor 27 facing the electric heating jacket; the antifreeze tank is also equipped with a temperature sensor 24 facing the electric condensing jacket. The antifreeze tank has an opening, and the temperature sensor is sealed and installed in the opening of the antifreeze tank to sense the temperature of the antifreeze liquid in the tank in real time. The technology of installing temperature sensors on a tank body is also well known and will not be described in detail.

[0069] Furthermore, the electric heating jacket, the electric condensing jacket, and the two temperature sensors are all connected to a temperature control system 25. The temperature control system belongs to the existing technology or well-known technology in this technical field and can be directly applied without further explanation.

[0070] Water control system: The present invention realizes the freeze-thaw test of the concrete surface coating through the freezing and thawing of water. Water is injected into the freeze-thaw device through the inlet and outlet pipes. The position of water is maintained at 2 / 3 of the water space. Considering that the density of water changes from approximately 1g / cm3 to approximately 0.9 g / cm3 when it freezes, the volume increases by 1 / 9. If it is filled with water, the ice will cause stress damage to the coating when it freezes, and it will be impossible to determine whether the damage to the coating is freeze-thaw damage or stress damage. In order to prevent such situations, or considering the injection of other liquids into the water space in the future, a conservative choice of 2 / 3 can achieve the purpose of meeting the conditions. At the end of the test, the internal water is discharged. Considering that there will be a certain pressure when pumping water, the drain outlet is designed to be kept above the coating to prevent the coating from being affected by the pumping pressure.

[0071] Freeze-thaw cycle system: This invention uses the antifreeze's low-temperature, non-freezing property as a conductor for water temperature transmission. The freeze-thaw cycle system sets the freeze-thaw frequency and time, and the antifreeze circulates to maintain the test temperature of the freeze-thaw device. Insulation cotton is wrapped around the freeze-thaw cycle's inlet and outlet pipes to prevent temperature loss during the cycle.

[0072] All components themselves that are not discussed in detail in this application and the connection methods of the components in this application are well-known technologies in this technical field and will not be described in detail.

[0073] In the present invention, the term "plurality" refers to two or more, unless otherwise specified. Terms such as "installed," "connected," "connected," and "fixed" should be interpreted broadly. For example, "connected" can mean fixed, removable, or integral; and "connected" can mean directly or indirectly through an intermediary. Those skilled in the art will understand the specific meanings of these terms in the present invention based on specific circumstances.

[0074] In the description of the present invention, it should be understood that the directions or positional relationships indicated by terms such as "up", "down", "left", "right", "front" and "back" are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or unit referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, they should not be understood as limiting the present invention.

[0075] Throughout this specification, terms such as "one embodiment," "some embodiments," and "specific embodiments" mean that the specific features, structures, materials, or characteristics described in conjunction with that embodiment or example are included in at least one embodiment or example of the present invention. In this specification, schematic representations of these 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 any one or more embodiments or examples.

[0076] The foregoing description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Those skilled in the art will readily appreciate that various modifications and variations of the present invention are possible. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention are intended to be within the scope of protection of the present invention.

Claims

1. Single-sided freeze-thaw test device for concrete surface coating, including: A freeze-thaw box, wherein the freeze-thaw box is provided with a water chamber and an antifreeze liquid chamber which are not connected to each other; a water control system, the water control system being in communication with the water cavity; a freeze-thaw circulation system, the freeze-thaw circulation system being in communication with the antifreeze liquid chamber; A pressure system, the pressure system pressing on the upper end surface of the freeze-thaw chamber; The invention is characterized in that it further comprises a base and a spherical seat, wherein a spherical groove is provided on the upper end surface of the base; the lower end of the spherical seat is spherical, and the upper end of the spherical seat is flat, wherein one end of the spherical seat is fitted into the spherical groove of the base, and a sample is placed on the flat surface of the upper end of the spherical seat; The lower end surface of the freeze-thaw box is provided with a sealing groove, and a sealing ring is installed in the sealing groove. The lower end surface of the freeze-thaw box is pressed against the coating on the upper end surface of the sample. The bottom of the water cavity is an open opening, and the open opening directly faces the coating. The sealing ring is located outside the open opening. The sealing groove is an annular sealing groove and has at least two sealing grooves. The antifreeze liquid cavity surrounds the periphery of the water cavity. The pressure system includes a hydraulic cylinder and a hydraulic control system. The power output end of the hydraulic cylinder presses on the upper end surface of the freeze-thaw box; the power input end of the hydraulic cylinder is connected to the hydraulic control system. The water control system includes a water supply pump and a drainage pump. The water outlet of the water supply pump is connected to the water inlet and outlet pipes of the water cavity. The ends of the water inlet and outlet pipes are sealed and pass through the wall of the freeze-thaw box to communicate with the water cavity inside the freeze-thaw box. The water inlet of the drainage pump is connected to the drainage pipe, and the drainage pipe is further connected to the radial opening in the middle of the water inlet and outlet pipes. A valve is installed at the outlet of the water supply pump, and a valve is installed at the inlet of the drainage pump. The freeze-thaw circulation system includes a circulation pump, an antifreeze tank, an electric heating jacket, and an electric condensing jacket. The liquid outlet of the circulation pump is connected to the starting end of the liquid inlet pipe, and the end of the liquid inlet pipe is sealed and communicated with the antifreeze liquid cavity inside the freeze-thaw tank through the freeze-thaw tank wall. The liquid inlet of the circulation pump is communicated with the liquid outlet of the antifreeze tank; the return liquid port of the antifreeze tank is connected to the end of the drain pipe, and the starting end of the drain pipe is sealed and communicated with the antifreeze liquid cavity inside the freeze-thaw tank through the freeze-thaw tank wall; the electric heating jacket is laid on one side outer wall of the antifreeze tank; and the electric condensing jacket is laid on the other side outer wall of the antifreeze tank.

2. The single-sided freeze-thaw test device for concrete surface coating according to claim 1, characterized in that: The outside of the liquid inlet pipe and the liquid discharge pipe is wrapped with a heat-insulating layer.

3. The single-sided freeze-thaw test device for concrete surface coating according to claim 2, characterized in that: The antifreeze tank is provided with a temperature sensor facing the electric heating jacket; the antifreeze tank is also provided with a temperature sensor facing the electric condensing jacket.

4. The single-sided freeze-thaw test device for concrete surface coating according to claim 3, characterized in that: The electric heating jacket, the electric condensing jacket and the two temperature sensors are all connected to a temperature control system.

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