CN111638176A - Concrete competition failure accelerated life test device and method - Google Patents
Concrete competition failure accelerated life test device and method Download PDFInfo
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- 238000012360 testing method Methods 0.000 title claims abstract description 226
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Abstract
The invention discloses a concrete competition failure accelerated life test device and a method, wherein a test box is internally provided with a plurality of electric devices, and is matched with an external water pumping and discharging assembly and a solution storage pool, so that comprehensive simulation of various environmental conditions such as light radiation, temperature and humidity change, rainfall, strong wind and the like can be realized, and a test result is more real and reliable through interaction of various environmental conditions. The method collects real environment climate data according to the actual environment of the concrete structure to be tested, determines the test conditions according to the real environment climate data, and sets the relevant working parameters of the test device, so that the environment state of the concrete test piece can be simulated more truly, the test process is more flexible and convenient, the operability of the method is strong, and the obtained test data is more accurate and reliable.
Description
Technical Field
The invention relates to the technical field of concrete durability testing, in particular to a concrete competition failure accelerated life testing device and method.
Background
At present, cement concrete is one of the most main structural materials in construction engineering and foundation engineering construction, and a concrete structure also becomes the most widely used structural form in various construction engineering. The concrete structure is damaged prematurely due to various factors, so that the concrete structure is corroded and fails, and serious economic loss is caused. Because the western region of China has a wide saline soil region, the saline soil and the harsh environment such as large local wind sand, large dryness, large temperature difference and the like seriously threaten the durability of the concrete structure, so that the durability problem of the concrete structure is more prominent. The research on the durability degradation process of the concrete in the actual service process can lay a theoretical guidance foundation for improving the durability of the concrete and prolonging the service life of a concrete structure.
The existing tests for researching the degradation rule of the durability of the concrete structure in the corrosive environment mainly comprise two types: a field exposure test method and an artificial accelerated life test method. The on-site exposure test method takes the actual on-site environment of the concrete structure as a corrosion environment, can be completed in decades generally, needs a large amount of manpower and material resources, and has unobvious effect in a short time; the manual accelerated life test method is relatively short in time consumption, but the conventional test mode and test environment are single, and generally when the influence of various test environments on the concrete structure is simulated, a concrete test piece needs to be tested in sequence under the corresponding environment, so that the efficiency of the test process is low, the influence of interaction of various test environments on the concrete structure cannot be simulated, and the obtained test result has low reference value due to the large difference between the test conditions and the real environment conditions.
Therefore, how to provide a concrete competition failure accelerated life test scheme with a more real and reliable test process and a relatively simpler and more convenient test process is a problem to be solved urgently by those skilled in the art.
Disclosure of Invention
In view of the above, the invention provides a concrete competition failure accelerated life test device and a method, the device can simulate interaction of various environmental conditions on a concrete test piece, and solves the problems that the existing concrete competition failure accelerated life test mode is low in efficiency, cannot simulate the influence of interaction of various test environments on a concrete structure, and is poor in reliability of test results.
In order to achieve the purpose, the invention adopts the following technical scheme:
in one aspect, the present invention provides a test apparatus for accelerated life of concrete competition failure, comprising:
the test box is used for carrying out the test process of the concrete sample;
the system comprises a solution storage pool, a test box and a control system, wherein a support framework is fixedly installed at the bottom of the solution storage pool, the solution storage pool is erected above one side of the test box through the support framework, and the solution storage pool is used for storing a corrosive salt solution for a test and is communicated with the test box;
one end of the water pumping and discharging assembly is communicated with the inside of the test box, and the other end of the water pumping and discharging assembly is communicated with the solution storage pool;
the radiation lamp tube is erected in the position, close to the top, in the test box;
the electric heater is arranged at the bottom of the inner side of the test box;
the fans are symmetrically arranged on two side walls of the test box;
the concrete test piece frame is arranged in the test box and is arranged below the fan;
the temperature sensor is arranged on one side in the test box;
the time controller is arranged on the outer wall of the solution storage pool, and the water pumping and discharging assembly, the radiation lamp tube, the fan and the electric heater are all electrically connected with the time controller;
the intelligent temperature controller is arranged on a support framework below the solution storage pool, and the electric heater and the temperature sensor are electrically connected with the intelligent temperature controller; and
the power supply control switch is arranged on the outer wall of the solution storage pool, the time controller and the intelligent temperature controller are both electrically connected with the power supply switch, and the power supply switch is electrically connected with an external power supply.
The invention has the beneficial effects that: the device is through setting up multiple electrical part in the proof box, and the outside drainage subassembly and the solution storage pond of cooperation can realize the comprehensive simulation of multiple environmental condition such as ray radiation, temperature and humidity change, rainfall and strong wind, and it is truer and more reliable to make the test result through multiple environmental condition interact, and the device structural design is simple reasonable, and it is convenient to install, and the controllability is strong, more is fit for popularizing and applying.
Further, the test box includes box, radiation protection casing, sealing washer and case lid in proper order, the box top is equipped with the radiation protection casing, the case lid is detained and is located the box top will through the sealing washer the box is sealed. The radiation protection cover is arranged at the contact position of the box cover and the box body, and the box cover and the box body are sealed through the sealing ring, so that harm to the external environment of the box body caused by an internal radiation light source is avoided, interference to the internal test environment caused by the external environment of the box body is also avoided, and the safety and the reliability of the test process can be improved to a certain extent.
Further, a heat insulation board is further arranged in the box body and fixedly connected with the inner wall of the box body. The heat preservation board is arranged to mainly conduct heat exchange for separating the inner environment and the outer environment of the box body, and reliability of a test process can be improved.
Furthermore, the water pumping and discharging assembly comprises a water pump, a water pumping pipe, a water discharging pipe and a valve, one end of the water pumping pipe is communicated with the solution storage tank, the other end of the water pumping pipe is communicated with a water outlet of the water pump, and a water inlet of the water pump extends into the test box through a pipeline; one end of the water drain pipe is communicated with the solution storage tank, the other end of the water drain pipe extends into the test box, and the valve is arranged on the water drain pipe.
The water pumping and discharging assembly has the main functions of pumping the salt solution which is required to be injected into the test box body for the test into the solution storage pool, and injecting the salt solution into the test box body from the solution storage pool when required, so that the simulation of the dry and wet environment of the concrete test piece is realized.
Furthermore, the concrete competition failure accelerated life test device further comprises a fan, wherein the fan is arranged on the outer side of the test box, and an air port of the fan extends into the test box. The setting of fan is mainly in order to take away the moisture content on concrete sample surface with the speed of rapider with the cooperation of fan.
Furthermore, one side of the test box is provided with a storage platform, the storage platform is fixedly connected with one side of the bottom plate of the test box and is flush with the bottom plate of the test box, and the support framework, the water pumping and discharging assembly and the fan are fixedly arranged on the storage platform.
Furthermore, walking wheels are arranged at the bottoms of the test box and the storage platform.
The supporting framework can be placed on the ground beside the test box, the motor, the fan and other components can be erected on the ground at proper positions, and can also be installed on one side of the test box through the supporting frame.
On the other hand, the invention also provides a concrete competition failure accelerated life test method, which uses the concrete competition failure accelerated life test device and comprises the following steps:
step 1: collecting environmental climate data of an area where a concrete structure to be tested is located;
step 2: determining test conditions of a concrete competition failure accelerated life test according to the collected environmental climate data;
and step 3: setting working parameters of the concrete competition failure accelerated life test device according to the determined test conditions of the concrete competition failure accelerated life test;
and 4, step 4: simulating environmental climate data of the area where the concrete structure to be tested is located by the set concrete competition failure accelerated life test device, and testing the concrete test piece;
and 5: and detecting the tested concrete sample, and collecting the accelerated life data of the tested concrete sample.
Specifically, the environmental climate data includes information such as air temperature, relative humidity, solar radiation intensity, rainfall, wind speed, soil temperature, and soil humidity.
Further, the test conditions of the concrete competition failure accelerated life test include a temperature range, a radiation intensity, a time period, a humidity range, a breeze speed and a salt solution ratio.
Specifically, for the temperature variation condition of a specific region, the monthly average maximum temperature and the monthly average minimum temperature of each month in the last two years of the region are obtained in advance and are made into a graph, and the temperature range of the rapid test is determined according to the graph data.
For the solar radiation conditions of a specific area, data such as annual average sunshine time, total annual radiation exposure and the like of the area are calculated in advance through meteorological data collected on site, and the irradiation duration is determined according to the data.
For the soil corrosion conditions of specific areas, a proper amount of soil samples with a certain depth from the earth surface are selected in advance for soil texture analysis, and corrosive salt solutions are prepared according to the water content in the soil measured in different seasons on site. By preparing different corrosive salt solutions (chloride salt, sulfate salt, composite salt, salt lake brine and the like) and changing the concentration of the solutions, the influence of corrosive ions on the durability of a concrete structure under the corrosion condition of single salt and composite salt is researched.
Furthermore, in order to ensure that the test effect is better, the inner container and the outer shell of the test box for accommodating the test piece are made of corrosion-resistant stainless steel materials, and a water pump, a valve, a pipeline and the like need corrosion-resistant treatment, so that corrosion is effectively prevented; if the concrete sample is a concrete sample with the steel bar needing to be exposed out of the surface of the sample, necessary coating protection, such as an epoxy resin coating, needs to be carried out on the exposed section of the steel bar.
According to the method provided by the invention, the real environment climate data is collected according to the actual environment of the concrete structure to be tested, the test conditions are determined according to the real environment climate data, and the relevant working parameters of the test device are set, so that the environment state of the concrete test piece can be simulated more truly, the test process is more flexible and convenient, the operability of the method is strong, and the obtained test data is more accurate and reliable.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.
FIG. 1 is a schematic structural diagram of a concrete competition failure accelerated life test device provided by the invention;
FIG. 2 is a schematic structural diagram of the accelerated life test apparatus for concrete competitive failure in the embodiment of the present invention at another viewing angle;
FIG. 3 is a schematic flow chart of a concrete competitive failure accelerated life test method according to the present invention;
FIG. 4 is a graph illustrating temperature variation in a certain area according to an embodiment of the present invention;
FIG. 5 is a schematic diagram showing the change rule of the durability evaluation index of the concrete sample with time in the embodiment of the invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
On one hand, referring to fig. 1 and fig. 2, an embodiment of the present invention discloses a concrete competition failure accelerated life test apparatus, including:
the test box 1 is a cubic stainless steel box in the embodiment;
the device comprises a solution storage tank 2, wherein a supporting framework 3 is fixedly installed at the bottom of the solution storage tank, the solution storage tank 2 is erected above one side of a test box 1 through the supporting framework 3, and the solution storage tank 2 is used for storing a corrosive salt solution for a test and is communicated with the test box 1;
one end of the water pumping and discharging component 4 is communicated with the inside of the test box 1, and the other end of the water pumping and discharging component 4 is communicated with the solution storage pool 2;
the radiation lamp tube 5 is erected in the position, close to the top, in the test box 1;
the electric heater 6 is arranged at the bottom of the inner side of the test box 1;
the fans 7 are symmetrically arranged on two side walls of the test box 1;
the concrete test piece rack 8 is erected in the test box 1, and the concrete test piece rack 8 is arranged below the fan 7;
the temperature sensor 9 is arranged on one side in the test box 1;
the time controller 10 is arranged on the outer wall of the solution storage pool 2, and the water pumping and discharging assembly 4, the radiation lamp tube 5, the fan 7 and the electric heater 6 are all electrically connected with the time controller 10;
the intelligent temperature controller 11 is arranged on the supporting framework 3, and the electric heater 6 and the temperature sensor 9 are electrically connected with the intelligent temperature controller 3; and
Specifically, the test chamber 1 sequentially includes a chamber body 101, a radiation shield 102, a sealing ring 103, and a chamber cover 104, the radiation shield 102 is disposed on the top of the chamber body 101, and the chamber cover 104 is fastened to the top of the chamber body 101 and seals the chamber body 101 through the sealing ring 103.
Preferably, the box body 101 is also internally provided with a heat insulation plate, and the heat insulation plate is fixedly connected with the inner wall of the box body 101. In order to achieve the heat preservation effect, the heat preservation rock wool board is selected for the heat preservation board.
In the embodiment, the radiation lamp tube 5 is a water-cooled xenon lamp tube capable of simulating the most important short-wave ultraviolet light in sunlight, and can simulate the change of a test piece under the exposure of the sunlight for a long time. The fan is arranged on the symmetrical plane of the box body, the xenon lamp tube is arranged on the upper portion of the box body, the fan and the xenon lamp tube are connected to the programmable time controller, intermittent blowing and ultraviolet radiation can be achieved, the electric heater 6 is a stainless steel electric heating tube, and the stainless steel electric heating tube is connected to the intelligent temperature controller (the detection end of the intelligent temperature controller is a temperature sensor, and the control end can be achieved through a microprocessor, such as a single chip microcomputer). In order to ensure the working safety of the electric device, the overcurrent protector 15 is arranged outside the solution storage tank in the embodiment, and the overcurrent protector 15 is connected to a power supply, so that the power supply can be cut off even when the current is too high, and the electric device is prevented from being burnt due to the too high current. Can adopt commercial power supply in this embodiment, also can install the battery additional, supply power for the device through the battery, specifically can rationally set up as required.
Preferably, in order to ensure the test precision, the concrete sample holder 8 should keep a certain distance from the radiation lamp 5, and the distance is relatively safer and more reliable at 300-380 mm.
Specifically, the water pumping and draining assembly 4 comprises a water pump 401, a water pumping pipe 402, a water draining pipe 403 and a valve (not shown), wherein one end of the water pumping pipe 402 is communicated with the solution storage tank 2, the other end of the water pumping pipe 402 is communicated with a water outlet of the water pump 401, and a water inlet of the water pump 401 extends into the test box 1 through a pipeline; one end of the water drain pipe 403 is communicated with the solution storage tank 2, the other end thereof extends into the test chamber 1, and the valve is arranged on the water drain pipe 403.
Preferably, the concrete competition failure accelerated life test device further comprises a fan 13, wherein the fan 13 is arranged on the outer side of the test box 1, and an air port of the fan 13 extends into the test box 1.
When the test is carried out by using the climatic environment simulation test device, firstly, a concrete test piece is placed on a test piece frame, and after the test piece is placed, a corrosive salt solution is injected, and half soaking or full soaking can be selected; when drying operation is carried out, the solution in the test box is pumped into a solution storage pool through a water pump (at the moment, a valve is closed), a fan is firstly opened for operation for a certain time, after the surface of a test piece is dried, the stainless steel electric heating pipe is used for heating according to preset temperature, meanwhile, the intelligent temperature controller is matched with a temperature sensor to realize monitoring and control of the temperature, when the dry-wet alternation time is reached, the valve is opened, then the saline solution is injected into the test box, and the dry-wet circulation is repeatedly realized; the simulation of solar radiation can be carried out simultaneously with the alternation of dry and wet, and the radiation time is controlled by a time controller. In order to achieve the purpose of quick drying, a fan can be additionally arranged to assist in blowing. Of course, considering that the test box is relatively airtight, in order to adjust the air pressure in the box body, a fan with an air draft function can be arranged, and the air in the test box is timely drawn out.
Preferably, one side of proof box 1 is equipped with platform 14, platform 14 and proof box 1's bottom plate one side fixed connection and with proof box 1's bottom plate parallel and level, support chassis 3 and the equal fixed mounting of drainage subassembly 4 on platform 14.
Preferably, the bottom of the test box 1 and the placement platform 14 is provided with a walking wheel 15. The device can be conveniently moved to a proper position for testing through the travelling wheels.
In addition, after the test is finished, a water outlet is further arranged on one side of the test chamber for facilitating the discharge of the salt solution in the test chamber, and the water outlet is closed during the test and is opened when the solution needs to be discharged.
On the other hand, referring to fig. 3, the embodiment of the present invention further discloses a concrete competition failure accelerated life test method, which uses the above concrete competition failure accelerated life test apparatus, and the method includes the following steps:
s1: collecting environmental climate data of an area where a concrete structure to be tested is located;
s2: determining test conditions of a concrete competition failure accelerated life test according to the collected environmental climate data;
s3: setting working parameters of the concrete competition failure accelerated life test device according to the determined test conditions of the concrete competition failure accelerated life test;
s4: simulating environmental climate data of the area where the concrete structure to be tested is located by the set concrete competition failure accelerated life test device, and testing the concrete test piece; if the freeze-thaw test is needed, the tested test piece is put into a freeze-thaw cycle tester for further test;
s5: and detecting the tested concrete sample, and collecting the accelerated life data of the tested concrete sample.
In the test method, firstly, the environmental climate conditions of a specific area where the concrete structure is located, including air temperature, relative humidity, solar radiation, rainfall, wind speed, soil temperature, soil humidity and the like, are accurately collected through a multifunctional automatic weather station equipped in an on-site exposure station, and information is transmitted to a microcomputer in a laboratory in a wireless transmission mode, so that the temperature range, the radiation intensity and the time period of the concrete accelerated life test, humidity control, breeze wind speed and the proportion of salt solution meeting the test requirements are determined;
then, the configuration of the accelerated test equipment is carried out by utilizing the obtained specific environmental climate conditions. The test device is combined with actual conditions and the operability of test equipment, and comprises a temperature control system (an intelligent temperature controller), a dry-wet circulating system (heating and ventilation) and an ultraviolet radiation system, namely the test device, and finally a freeze-thaw circulating system (a freeze-thaw circulating tester meeting the national standard of GBT 50082 + 2009 test method for long-term performance and durability of ordinary concrete) is configured.
And then, determining an accelerated life test system, wherein the accelerated life test system comprises the simulation of the influence of the environment of a specific area in spring, summer, autumn and winter on the durability of the concrete sample.
And finally, carrying out an accelerated life test and collecting accelerated life data. The durability failure of the (steel bar) concrete test piece falls within the scope of competitive failure, i.e. the concrete durability failure is caused by only one of the K failure modes. The failure mode has the indexes of mass loss rate, relative dynamic elastic modulus, compressive strength attenuation, erosion depth, unsteady state chloride ion migration coefficient, porosity, reinforcing steel bar weight loss rate, concrete resistivity, reinforcing steel bar polarization resistance and the like reaching a certain threshold value.
Preferably, for the actual conditions of abundant solar energy resources and strong solar radiation in western regions, relevant documents about the influence of solar radiation on the performance of the concrete test piece are few, and a durability test combining the solar radiation with factors such as dry-wet freeze-thaw salt corrosion is lack of corresponding research. On the basis of corresponding specifications, the method combines the characteristics of natural areas in specific areas, finally considers the operability of tests and the practical conditions of laboratories, can select the quality loss and the dynamic elastic modulus as the evaluation indexes of the test durability for concrete, and can increase the evaluation indexes of polarization resistance, corrosion rate and the like for reinforced concrete.
The above method provided by the present invention is described in detail by a specific example below:
step 1: the environmental climate conditions of a particular area in which a concrete structure is located are collected in detail in the field.
This example takes as an example a concrete accelerated life test performed by simulating the natural environment in a certain western region. When the accelerated life test is carried out, the damage failure mechanism of the concrete test piece under the indoor accelerated test condition is ensured to be the same as that under the field service environment condition. The purpose of carrying out the indoor manual accelerated test is to carry out the service life test under the severer condition in order to save time, so that the service life of the concrete test piece under the field service environment can be extrapolated.
The regional climate resources mainly comprise: heat, light, water, etc. The main characteristics of the climate resource distribution are:
the region belongs to the semiarid climate of the continental plateau, the temperature difference is large, and the temperature difference of the day is more than 20 ℃. The reason is that the geographical position is in the northwest of China, the altitude of the urban area is 2260m, and the reason is that the terrain is high, the solar radiation is strong, and the ground temperature is high in the daytime. The cooling speed is fast when the user goes to night, so the temperature at night is low. The annual temperature difference is about 50 ℃, the average temperature is about 8 ℃, the highest temperature reaches about 30 ℃, and the lowest temperature is about minus 20 ℃. The average temperature in summer is 17-19 ℃, the average temperature in winter is about-10 ℃, and a temperature curve chart from 1 month in 2014 to 12 months in 2015 is shown in fig. 4;
the annual average sunshine duration in the area is longer, about 2500 h. The total radiation annual exposure is 5180-6337MJ/m2, and the solar radiation resource is rich. The total radiation change of the month in the region is large, the difference between the maximum month and the minimum month is more than 372.1MJ/m2, the change curve is in a unimodal shape, wherein the total radiation is strongest in 5-8 months in summer, the total radiation is more than 600MJ/m2, and the total radiation all the places of the maximum month in one year appears in May.
The frost-free freezing period of the area begins from late 4 months and ends in about 10 months, and is more than 150 days;
the wind direction in the area is mainly breeze. The annual average precipitation was about 380mm and the evaporation was 1363.6 mm. The rainfall periods are also uneven distribution. The rainwater is more in summer and less in winter. Most of the areas are rainy from the last 5 months to the last 10 months;
the soil texture analysis report of the test site in this area is shown in table 1. Wherein n and m are the amount and mass of the substance of the measured item per kilogram of soil mass, respectively.
TABLE 1 test site soil texture analysis report
Based on the current situation of the actual climatic environment of the area, the concrete of the basic engineering of the area is easily influenced by composite salt erosion, dry-wet alternation and freeze-thaw cycle. According to the analysis report, the corrosivity of the soil was set to an accelerated stress level, and the amounts of various salts and the concentrations of the solutions in the prepared composite salt solutions were as shown in table 2.
TABLE 2 salt dosage and solution concentration in salt solutions
Step 2: speeding up the configuration of the test instrument.
And combining the analysis, a climate environment simulation test device and a freeze-thaw test machine are required to be configured for simulating the influence of the natural environment in the area to perform the concrete accelerated life test.
And step 3: and determining an accelerated life test system.
The deterioration process of the concrete test piece in the area should be the result of the simultaneous action of several factors in the complex salt attack, solar radiation, alternation between dry and wet and freeze-thaw cycles. And (4) simulating the deterioration process of the test piece in spring, summer and autumn and winter in the area by combining all factors.
Specifically, the method includes simulating the action of breeze and high-intensity solar radiation in spring, simulating the breeze in spring for one week, fully soaking a test piece with the standard maintenance size of 100mm × 100mm × 400mm in a prepared solution for 4d before testing, simulating the breeze by a fan, blowing the breeze twice every day and radiating ultraviolet rays once, blowing the breeze for 1h every time, soaking the test piece for 3h at intervals, utilizing a xenon lamp to radiate the test piece for 8h every time, soaking the test piece for the rest of time after the completion, opening a valve during soaking, injecting the solution into a storage tank by a solution pump, pumping the solution into the storage tank by a water pump during breeze simulation, controlling the time by a controller, and testing the mass W, the ultrasonic sound velocity V and the dynamic elastic modulus E of the test piece after each spring simulationdCorrespondingly calculating a relative quality evaluation parameter omega1And relative dynamic elastic modulus evaluation parameter omega2；
Specifically, the relative quality evaluation parameter ω1The calculation formula of (2) is as follows:
ω1＝(Wr-0.95)/0.05
wherein Wr is the relative mass.
Relative dynamic elastic modulus evaluation parameter omega2The calculation formula of (2) is as follows:
ω2＝(Er-0.60)/0.40
wherein E isrIs the relative dynamic elastic modulus.
Dynamic modulus of elasticity EdThe calculation formula of (2) is as follows:
in the formula, a is the side length of the cross section of the test piece, and the unit is mm; l is the length of the test piece and is in mm; w is the mass of the test piece in kg; f is the transverse fundamental frequency of the test piece, and the unit is Hz; and K is the size correction coefficient of the test piece.
Simulating the action of high temperature and solar radiation in summer, simulating the action of high temperature and solar radiation in summer for one week,and then carrying out 14 times of dry-wet alternation tests (two times of dry-wet alternation cycle every day, one time of drying for 2.5 hours and cooling for 2.5 hours, the heating temperature of an electric heating pipe is 70 +/-2 ℃, and the cooling is natural air cooling) by using an environmental climate simulation test device, and injecting a saline solution until the test piece is soaked for 14 hours. The test piece needs to be irradiated for 8 hours every day, and the irradiation can be carried out simultaneously with the dry-wet cycle. After one week, testing the mass m, the ultrasonic sound velocity V and the dynamic elastic modulus E of the test piecedCorrespondingly calculating a relative quality evaluation parameter omega1Relative dynamic elastic modulus evaluation parameter ω2；
Simulating the action of freeze-thaw cycles in autumn and winter, simulating the test piece in autumn and winter once for one week, performing freeze-thaw cycles in a rapid freeze-thaw machine for 6 times every day (the freeze-thaw cycles are freezing at minus 15 +/-2 ℃ for 2 hours, and melting at 6 +/-2 ℃ for 2 hours), and similarly testing the mass m, the ultrasonic sound velocity V and the dynamic elastic modulus E of the test piece after each simulation in autumn and winterdCorrespondingly calculating a relative quality evaluation parameter omega1And relative dynamic elastic modulus evaluation parameter omega2。
Three weeks as one large cycle, i.e., 21 days, were completed, and the test was stopped when one of the relative mass evaluation parameter or the relative dynamic elastic modulus evaluation parameter was zero.
And 4, step 4: and carrying out an accelerated life test and collecting accelerated life data.
The change law of the durability evaluation index of the concrete sample prepared according to the collected accelerated life data with time for the concrete sample with a certain mixing ratio is shown in fig. 5. Relative quality evaluation parameter ω1And relative dynamic elastic modulus evaluation parameter omega2The concrete durability degradation factor evaluation index and the concrete durability degradation factor evaluation index have a mutual competition failure relationship, and according to a curve graph of each concrete durability degradation factor evaluation index changing along with time, a related durability degradation process can be analyzed, and meanwhile, further service life prediction research can be carried out according to related life data.
The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other. The device disclosed by the embodiment corresponds to the method disclosed by the embodiment, so that the description is simple, and the relevant points can be referred to the method part for description.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (10)
1. The utility model provides a concrete competition failure accelerated life test device which characterized in that includes:
a test chamber (1);
the device comprises a solution storage pool (2), wherein a supporting framework (3) is fixedly installed at the bottom of the solution storage pool (2), the solution storage pool (2) is erected above one side of a test box (1) through the supporting framework (3), and the solution storage pool (2) is used for storing a corrosive salt solution for a test and is communicated with the test box (1);
one end of the water pumping and discharging assembly (4) is communicated with the inside of the test box (1), and the other end of the water pumping and discharging assembly (4) is communicated with the solution storage tank (2);
the radiation lamp tube (5), the said radiation lamp tube (5) is erected in the position close to top in the said test box (1);
the electric heater (6), the said electric heater (6) locates the inboard bottom of the said test box (1);
the fans (7), the fans (7) are symmetrically arranged on two side walls of the test box (1);
the concrete test piece rack (8) is erected in the test box (1), and the concrete test piece rack (8) is arranged below the fan (7);
the temperature sensor (9), the said temperature sensor (9) is set up in one side of the said test chamber (1);
the time controller (10), the time controller (10) is installed on the outer wall of the solution storage pool (2), and the water pumping and discharging assembly (4), the radiation lamp tube (5), the fan (7) and the electric heater (6) are all electrically connected with the time controller (10);
the intelligent temperature controller (11), the intelligent temperature controller (11) is arranged on the supporting framework (3), and the electric heater (6) and the temperature sensor (9) are electrically connected with the intelligent temperature controller (3); and
the power supply control switch (12), the power supply control switch (12) is arranged on the outer wall of the solution storage pool (2), the time controller (10) and the intelligent temperature controller (11) are both electrically connected with the power supply control switch (12), and the power supply control switch (12) is also electrically connected with an external power supply.
2. The concrete competition failure accelerated life test device according to claim 1, wherein the test box (1) sequentially comprises a box body (101), a radiation protection cover (102), a sealing ring (103) and a box cover (104), the radiation protection cover (102) is arranged on the top of the box body (101), and the box cover (104) is buckled on the top of the box body (101) and seals the box body (101) through the sealing ring (103).
3. The concrete competition failure accelerated life test device according to claim 1, wherein an insulation board is further arranged in the box body (101), and the insulation board is fixedly connected with the inner wall of the box body (101).
4. The concrete competition failure accelerated life test device according to claim 1, wherein the water pumping and discharging assembly (4) comprises a water pump (401), a water pumping pipe (402), a water discharging pipe (403) and a valve, one end of the water pumping pipe (402) is communicated with the solution storage tank (2), the other end of the water pumping pipe is communicated with a water outlet of the water pump (401), and a water inlet of the water pump (401) extends into the test box (1) through a pipeline; one end of the water discharge pipe (403) is communicated with the solution storage tank (2), the other end of the water discharge pipe extends into the test box (1), and the valve is arranged on the water discharge pipe (403).
5. The concrete competition failure accelerated life test device according to claim 1, further comprising a fan (13), wherein the fan (13) is arranged on the outer side of the test box (1), and an air port of the fan (13) extends into the test box (1).
6. The concrete competition failure accelerated life test device according to claim 1, wherein a storage platform (14) is arranged on one side of the test box (1), the storage platform (14) is fixedly connected with one side of a bottom plate of the test box (1) and is flush with the bottom plate of the test box (1), and the support framework (3) and the drainage component (4) are fixedly arranged on the storage platform (14).
7. The concrete competition failure accelerated life test device according to claim 6, wherein walking wheels (15) are arranged at the bottoms of the test box (1) and the placement platform (14).
8. A concrete competitive failure accelerated life test method using the concrete competitive failure accelerated life test apparatus according to any one of claims 1 to 7, comprising:
step 1: collecting environmental climate data of an area where a concrete structure to be tested is located;
step 2: determining test conditions of a concrete competition failure accelerated life test according to the collected environmental climate data;
and step 3: setting working parameters of the concrete competition failure accelerated life test device according to the determined test conditions of the concrete competition failure accelerated life test;
and 4, step 4: simulating environmental climate data of the area where the concrete structure to be tested is located by the set concrete competition failure accelerated life test device, and testing the concrete test piece;
and 5: and detecting the tested concrete sample, and collecting the accelerated life data of the tested concrete sample.
9. The method as claimed in claim 8, wherein the environmental climate data includes air temperature, relative humidity, solar radiation intensity, rainfall, wind speed, soil temperature and soil humidity.
10. The method as claimed in claim 8, wherein the test conditions of the concrete competitive failure accelerated life test include temperature range, radiation intensity and time period, humidity range, breeze speed and salt solution ratio.
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| CN112945839A (en) * | 2021-03-29 | 2021-06-11 | 民航建设(天津)科技有限公司 | Concrete pavement durability test method |
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