CN216791977U

CN216791977U - Marine engineering concrete strong wind and high salt fog concentration coupling environment simulator

Info

Publication number: CN216791977U
Application number: CN202123396360.2U
Authority: CN
Inventors: 吕欢; 关青锋; 孟广成; 夏京亮; 曾峰; 贺阳; 冯云龙; 熊冲; 王晶; 周永祥
Original assignee: Cabr Building Materials Co ltd; China Academy of Building Research CABR; China Road and Bridge Corp
Current assignee: Cabr Building Materials Co ltd; China Academy of Building Research CABR; China Road and Bridge Corp
Priority date: 2021-12-30
Filing date: 2021-12-30
Publication date: 2022-06-21
Anticipated expiration: 2031-12-30

Abstract

The utility model discloses a marine concrete strong wind and high salt spray concentration coupling environment simulator, which comprises a plate box body, a sample table, a fan, a constant temperature system and a spraying system, wherein the sample table is arranged on the plate box body; the spraying system is positioned at the top of the plate box body and is connected with the seawater storage device through a water inlet pipe, the position of the spraying system is over against the sample table at the bottom of the plate box body and is used for humidifying the sample, and the spraying system is provided with an atomizer capable of adjusting the mist output; the constant temperature system is positioned at the corner of the top of the plate box body; the fan is positioned on the side wall of the plate box body and used for controlling the air speed at the position of the concrete sample tank; the sample stage is provided with a sensor for monitoring the wind speed, the salt spray sedimentation amount and the temperature change condition; the sample platform is provided with a plurality of concrete sample grooves, and the concrete sample grooves and the sensors are arranged alternately. The simulated strong wind and salt fog environment parameter has a large variation range, can realize the regulation and control of the environmental wind speed, the relative humidity and the salt fog particle size, and simulates a real strong wind and salt fog coupling corrosion environment.

Description

Marine engineering concrete strong wind and high salt fog concentration coupling environment simulator

Technical Field

The utility model relates to the technical field of environment simulators, in particular to a marine concrete strong wind and high salt spray concentration coupling environment simulator.

Background

At present, domestic researches on the durability of concrete under the conditions of strong wind and strong wind are basically concentrated on the gobi and plateau areas with northwest drought, strong wind and sand and large temperature difference, while the research data on the durability of concrete under the coupling environment of strong wind and rich salt in coastal areas are less, and no marine atmospheric environment simulation and acceleration special for concrete are availableAnd (4) testing standard. The closer test Method is the Salt Fog box test Method, the Salt Fog test box has wide application in the aspects of chemical industry, materials and military industry, the industry Standard is a lot, the current international Standard is ASTM B117-73(1979) Standard Method of Salt Spray (Fog) Testing, the Salt Spray test Method is used for testability test, and the test parameters are fixed. The concentration of the adopted saline water is 5 percent, the continuous spraying is carried out, and the settling amount of the salt fog is measured by the mist collecting amount and is 1-2 ml/(80 cm)²H); the temperature is about 35 ℃, and the humidity is above 90%.

The method for analyzing the acceleration of concrete chloride ion erosion in a salt spray environment by the cliff and the like considers that the salt spray content and the salt spray sedimentation amount in a marine atmospheric environment are important environmental parameters of the salt spray environment, influence the erosion of chloride ions in concrete and are influenced by the distance from a sea shore, the wind speed and the humidity. The existing salt spray tests are carried out according to the specifications of the electronic and metal industries, the variation range of environmental parameters is small, and the salt spray tests can only be used as material verification type tests. In addition, due to the limitation of the existing test technology, the salt spray box is difficult to realize the regulation and control of relative humidity and the requirement of the particle size of salt spray, and the real salt spray environment cannot be simulated.

The Xue Hui Jun et al designed the concrete sand blast erosion test device to simulate the impact of sand blast on the concrete in the northwest area under the sand storm environment. According to the wind sand strength meteorological data of inner Mongolia, the research result of wind sand erosion on concrete is referred to, the erosion rate is an important index for measuring the surface spalling of the concrete under the influence of wind sand erosion, the larger the kinetic energy of sand grains is when the wind speed is increased, the larger the concrete erosion rate is, the lower the erosion rate is caused by the mutual collision energy consumption of the sand grains when the sand carrying amount is too large, and the erosion rate and the erosion degree are the largest at an attack angle of 90 degrees. Therefore, representative sand erosion parameters are selected, meanwhile, in order to increase the test effect, the sand erosion parameters are artificially expanded, the sand erosion parameters are selected as 31m/s (11-level storm wind), 30g/min of sand entrainment and 90-degree attack angle, and the sand erosion test is carried out on the fixed non-molding surface of the concrete.

SUMMERY OF THE UTILITY MODEL

The utility model aims to provide a marine concrete strong wind and high salt spray concentration coupling environment simulator, which solves the defects that the salt spray box in the prior art has small variation range of environmental parameters, is difficult to realize the regulation and control of wind speed and relative humidity and the requirements on the particle size of salt spray, and cannot simulate a real salt spray environment.

In order to achieve the purpose, the utility model is realized by adopting the following technical scheme:

a marine concrete strong wind and high salt fog concentration coupling environment simulator comprises a plate box body, a sample table, a fan, a constant temperature system and a spraying system; the sample table is positioned at the bottom of the plate box body; the spraying system is positioned at the top of the plate box body and is provided with an atomizer capable of adjusting the mist output; the constant temperature system is positioned at the corner of the top of the plate box body; the fan is positioned on the side wall of the plate box body and used for controlling the air speed at the concrete sample tank; the spraying system is connected with the seawater storage device through a water inlet pipe and used for guiding seawater into the plate box body.

Preferably, in the marine concrete strong wind and high salt spray concentration coupling environment simulator, the position of the spraying system is opposite to the sample stage and is used for humidifying the sample.

Preferably, in the marine concrete gale and high salt spray concentration coupling environment simulator, the number of the atomizers is at least three.

Preferably, the marine concrete strong wind and high salt spray concentration coupling environment simulator is characterized in that the sample stage is provided with a sensor, and the sensor is used for monitoring wind speed, salt spray settlement and temperature change conditions.

Preferably, the marine concrete strong wind and high salt spray concentration coupling environment simulator is characterized in that the sample stage is provided with a plurality of concrete sample grooves, the concrete sample grooves are used for placing concrete samples to be tested, and the concrete sample grooves and the sensors are arranged alternately.

Preferably, the marine concrete strong wind and high salt spray concentration coupling environment simulator is characterized in that an air outlet is formed in the side wall of the plate box body.

Preferably, the marine concrete strong wind and high salt spray concentration coupling environment simulator has at least two air outlets.

Preferably, in the marine concrete strong wind and high salt spray concentration coupling environment simulator, the fan is located on one side of the sample stage and faces the air outlet, and is used for applying a strong wind environment to the sample.

Preferably, in the marine concrete strong wind and high salt spray concentration coupling environment simulator, a water outlet is formed at a corner of the bottom of the plate box body and used for discharging redundant seawater.

According to the technical scheme, the utility model has the following beneficial effects: the simulated strong wind and salt fog environment parameter has a large variation range, can realize the regulation and control of the environmental wind speed, the relative humidity and the salt fog particle size, and simulates a real strong wind and salt fog coupling corrosion environment.

Drawings

FIG. 1 is a schematic view of the overall structure of the present invention;

the meaning of the reference numerals: 1. a sample stage; 2. a water outlet; 3. a fan; 4. a constant temperature system; 5. a seawater reservoir; 6. a water inlet pipe; 7. a spray system; 8. a sensor; 9. a concrete sample tank; 10. an air outlet; 11. the board case body.

Detailed Description

The utility model is further described below with reference to the accompanying drawings. The following examples are only for illustrating the technical solutions of the present invention more clearly, and the protection scope of the present invention is not limited thereby.

In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on those shown in the drawings, and are used only for convenience in describing the present invention and for simplicity in description, and do not indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and thus, are not to be construed as limiting the present invention. Furthermore, the terms "first", "second", etc. are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first," "second," etc. may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless otherwise specified.

In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art through specific situations.

As shown in figure 1, the utility model discloses a marine concrete strong wind and high salt spray concentration coupling environment simulator, which comprises a plate box body 11, a sample table 1, a fan 3, a constant temperature system 4 and a spraying system 7; sample platform 1 is located 11 bottoms of board case body, and sample platform 1 is equipped with a plurality of concrete sample groove 9, and concrete sample groove 9 is used for placing the concrete sample of treating the experiment, and sample platform 1 still is equipped with sensor 8, and sensor 8 is multifunctional sensor, can monitor wind speed, salt spray settlement volume and the temperature variation condition, and concrete sample groove 9 sets up with sensor 8 is alternate. The spraying system 7 is located the top of the plate box body 11, the spraying system 7 is provided with atomizers capable of adjusting the fog output, the atomizers can atomize simulated seawater, and the number of the atomizers is at least three. The corner at the top of the plate box body 11 is provided with a constant temperature system 4 for adjusting the temperature in the plate box body 11 and keeping the temperature required by the test. The lateral wall of the plate box body 11 is provided with a fan 3 which can simulate the wind action of different wind speeds and control the wind speed at the concrete sample groove 9. The spraying system 7 is connected with a seawater reservoir 5 through a water inlet pipe 6 and is used for introducing seawater into the plate box body 11. The spraying system 7 is positioned opposite to the sample table 1 and is used for humidifying the sample. The lateral wall of the plate box body 11 is provided with air outlets 10, and the number of the air outlets 10 is at least two. The fan 3 is arranged on one side of the sample table 1 and is opposite to the air outlet 10 and used for applying a strong wind environment to the sample. The corners of the bottom of the plate box body 11 are provided with water outlets 2, the water outlets 2 are used for discharging redundant seawater, and the number of the water outlets 2 is at least two.

The following is an example of a reinforced concrete deterioration test using the present invention to simulate typical environmental effects in tropical coastal areas:

(1) subject to test mix

According to the research situation, the typical strength grade C30 common concrete mixing ratio is selected as the test standard mixing ratio, and the details are shown in the following table.

Strength grade

Water to glue ratio

Total amount of cementitious Material/kg

Rate of FA substitution

Design density

Sand rate

Grade II FA/kg

Cement/kg

Sand/kg

Pebbles/kg

Water/kg

C30

0.46

380

30％

2377

40％

114

266

729

1093

175

(2) Test items

The test piece is a large-size concrete 300 × 100mm plate-shaped test piece, and the concentration of chloride ions on the surface layer of the concrete test piece under different simulated environmental conditions is tested to compare the permeation condition of the chloride ions to the surface layer of the concrete under different environmental conditions, such as a strong wind condition and a dry-wet alternate condition.

(3) Simulation of environmental conditions

Wind power: according to the research result, the average wind speed of a certain tropical zone along the sea in the last 50 years is 4.9m/s (three levels), and the average wind speed measured at different positions is larger. Therefore, under the condition of comprehensively considering the actual working condition and improving the test grade, the test is carried out by using four-grade wind, and the wind power action is simulated by using the fan 3.

Sea water: according to the water quality analysis result of the taken seawater, a NaCl solution with the chloride ion concentration of 22000mg/L is adopted for simulation.

③ salt fog: because the main component composition in the salt spray is similar to that of seawater, the salt spray effect is usually simulated by atomizing seawater in the current research, so that the seawater is simulated by atomizing the seawater by using an atomizer, and the fog output of the atomizer is 1500 ml/h. Through the salt spray sedimentation amount test, the salt spray sedimentation amount of the simulated environment reaches 140mg/m²D, depending on the investigation, the sedimentation is slightly higher than in coastal areasThe maximum sedimentation amount of the salt spray simulation device can be biased to strictly simulate the salt spray condition of tropical coastal areas.

(3) Test protocol

In order to compare the effect influence of chloride ion erosion under different simulated environmental conditions, three simulated environmental forms are mainly considered in the test:

soaking in simulated seawater for a long time to simulate the underwater environment;

secondly, the salt fog simulator is under the simulated salt fog effect of simulated wind power for a long time, so as to simulate the environment of an atmospheric region, wherein the simulated wind power effect of 6 hours is provided in each 1d of salt fog effect;

and thirdly, under the alternate action of simulating seawater immersion and simulating strong wind and salt fog, simulating the environments of a splash zone and a water level change zone, and after the simulated seawater is immersed for 1d, alternately simulating the strong wind and salt fog action for 1d, thereby repeatedly and alternately acting.

During testing, a test piece is placed in the concrete sample tank 9, a NaCl solution with the chloride ion concentration of 22000mg/L is added into the seawater storage 5, the operation of the fan 3 and the atomizer is controlled according to the three test schemes, the constant temperature system 4 is started to adjust the temperature in the plate box body 11 and keep the temperature required by the test, and the sensor 8 is started to monitor the wind speed, the salt spray sedimentation amount and the temperature change condition, so that the normal operation of the test is ensured.

Sampling is carried out at the age of 90d, the concentration of chloride ions on the surface layer of the concrete sample is tested, and the concentration of the chloride ions on the surface layer of the concrete sample is calculated, wherein the sampling depths are 0-3mm, 3-6mm and 6-9mm respectively. According to the test scheme, the surface layer of the concrete sample is shown in the figure under the chloride ion concentration of 0-3mm, 3-6mm and 6-9mm in depth under different tested simulated environments.

The test result shows that the surface chloride ion concentration of the concrete sample under the action of simulated salt spray simulating wind power for a long time is obviously higher than that of the concrete sample soaked in simulated seawater for a long time and under the alternate action of simulated seawater soaking and simulated strong wind salt spray. Taking the chloride ion concentration of 0-3mm depth nearest to the surface as an example, the former is 90.9% and 59.6% higher than the latter two respectively. It can be seen that the simulated atmospheric region environment becomes the most severe environment of deterioration by chloride ion attack, which is different from the deterioration level of the conventional atmospheric region environment specified in the relevant durability design standard. It is generally considered that the level of chloride ion corrosion in the splash zone and the water level fluctuation environment zone with the alternation of dry and wet is higher than that in the atmosphere zone and the underwater zone without alternation of dry and wet. The main reason for this result should be the high concentration of salt spray in tropical coastal areas and the high wind action of high wind speed. The strong wind environment can cause the speed of the water convection on the surface of the concrete to be accelerated, the surface of the water diffusion to be increased, and the water evaporation to be aggravated, namely, the even more frequent alternation of dry and wet can also happen on the microscopic level under the salt fog environment of the atmospheric region, thereby causing the obvious acceleration of the corrosion rate of the chloride ions to the concrete. On the contrary, the macroscopic frequency of alternation between dry and wet in the splash zone is relatively low, and the alternation between dry and wet under the action of strong wind is avoided in the water immersion process, so that the degradation grade of the salt spray environment in the atmospheric zone is lower than that under the action of strong wind. The method is also an important difference between the high-concentration salt fog in tropical coastal areas and the common chlorine salt environment in the common areas under the action of strong wind with high wind speed.

The embodiment of the utility model has the following beneficial effects: the simulated strong wind and salt fog environment parameter has a large variation range, can realize the regulation and control of the environmental wind speed, the relative humidity and the salt fog particle size, and simulates a real strong wind and salt fog coupling corrosion environment. It will be appreciated by those skilled in the art that the utility model may be embodied in other specific forms without departing from the spirit or essential characteristics thereof. The embodiments disclosed above are therefore to be considered in all respects as illustrative and not restrictive. All changes which come within the scope of or equivalence to the utility model are intended to be embraced therein.

Claims

1. A marine concrete strong wind and high salt spray concentration coupling environment simulator comprises a plate box body (11), and is characterized by further comprising a sample table (1), a fan (3), a constant temperature system (4) and a spraying system (7); the sample table (1) is positioned at the bottom of the plate box body (11); the spraying system (7) is positioned at the top of the plate box body (11), and the spraying system (7) is provided with an atomizer capable of adjusting the mist output; the constant temperature system (4) is positioned at the corner of the top of the plate box body (11); the fan (3) is positioned on the side wall of the plate box body (11), and the fan (3) is used for controlling the air speed at the concrete sample groove (9); the spraying system (7) is connected with the seawater storage device (5) through a water inlet pipe (6) and used for introducing seawater into the plate box body (11).

2. The marine concrete strong wind and high salt spray concentration coupled environment simulator of claim 1, wherein the position of the spraying system (7) is opposite to the sample stage (1) for humidifying the sample.

3. The marine concrete strong wind and high salt spray concentration coupled environment simulator of claim 1, wherein the number of the atomizers is at least three.

4. The marine concrete strong wind and high salt spray concentration coupled environment simulator according to claim 1, wherein the sample stage (1) is provided with a sensor (8), and the sensor (8) is used for monitoring wind speed, salt spray settlement and temperature change.

5. The marine concrete strong wind and high salt spray concentration coupling environment simulator according to claim 4, wherein the sample table (1) is provided with a plurality of concrete sample grooves (9), the concrete sample grooves (9) are used for placing concrete samples to be tested, and the concrete sample grooves (9) and the sensors (8) are arranged at intervals.

6. The marine concrete strong wind and high salt spray concentration coupling environment simulator of claim 1, wherein the side wall of the plate box body (11) is provided with an air outlet (10).

7. The marine concrete strong wind and high salt spray concentration coupling environment simulator of claim 6, wherein the number of the air outlets (10) is at least two.

8. The marine concrete strong wind and high salt spray concentration coupled environment simulator according to claim 6, wherein the fan (3) is located at one side of the sample stage (1), and the fan (3) faces the air outlet (10) for applying a strong wind environment to the sample.

9. The marine concrete strong wind and high salt spray concentration coupling environment simulator according to claim 1, wherein a water outlet (2) is arranged at a corner of the bottom of the crate body (11), and the water outlet (2) is used for discharging redundant seawater.