CN107063987B - A kind of concrete test case and its test method considering plateau effects of air pressure - Google Patents
A kind of concrete test case and its test method considering plateau effects of air pressure Download PDFInfo
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- CN107063987B CN107063987B CN201710283878.4A CN201710283878A CN107063987B CN 107063987 B CN107063987 B CN 107063987B CN 201710283878 A CN201710283878 A CN 201710283878A CN 107063987 B CN107063987 B CN 107063987B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N17/00—Investigating resistance of materials to the weather, to corrosion, or to light
- G01N17/002—Test chambers
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
- G05D27/00—Simultaneous control of variables covered by two or more of main groups G05D1/00 - G05D25/00
- G05D27/02—Simultaneous control of variables covered by two or more of main groups G05D1/00 - G05D25/00 characterised by the use of electric means
Abstract
A kind of concrete test case and its test method considering plateau effects of air pressure, the present invention relates to concrete test casees.The present invention is in order to solve the problems, such as that the prior art does not consider that the influence of air pressure leads to shrinkage cracking.The present invention includes: experiment casing, cover board, sealing ring, refrigeration machine, humidifier, dehumidifier, vacuum pump, control panel, refrigerator pipes, heating tube, temperature and humidity and pressure transducer, multiple monitoring cameras and insulation board；The top half setting monitoring camera and refrigerator pipes of experiment casing inner wall, refrigerator pipes pass through the refrigeration machine outside connecting tube connection test cabinet；The lower half portion setting temperature and humidity and pressure transducer and heating tube of experiment casing inner wall；Humidifier, dehumidifier and vacuum pump pass through the lower half portion of connecting tube connection test cabinet respectively；Insulation board is arranged in the outer wall surface of experiment casing, and control panel is arranged on insulation board；Cover board is set in experiment casing, sealing ring is set between cover board and experiment casing.The present invention is used for engineering design field.
Description
Technical field
The present invention relates to concrete test case and its test methods.
Background technique
In concrete works, materials ' durability problem is not still well solved, and most endurance issues
Cause be problem of Cracking, engineering practice shows: 80% concrete structure crack be because concrete material in environmental change
Under the influence of caused by the non-load stress that generates.Currently, construction of the West Region is one of the hot spot of current China's construction, but investigate hair
It is existing, under the typical low pressure in the western major part region in China, low humidity and big temperature difference climatic environment, the cracking phenomena of concrete
It is even more serious.In concrete works, such as the foundation engineering of hydro-structure, large equipment base, skyscraper and large bridge
In, concrete structure can be under the constraint condition of itself by biggish tensile stress, when this stress exceeds the coagulation with age
When native tensile strength, the cracking of concrete will cause, and this destruction mostly occurs on surface layer, if the cracking of concrete is at this moment
It is not protected, it is possible to crosscutting concern is developed into, so that bigger harm, or even meeting can integrally be caused to concrete structure
Cause bigger endurance issues.Comprehensive domestic and international present Research, the environment item coupled for temperature, humidity and air pressure and three
The research of concrete performance and durability under part is less, but concrete works are important portions indispensable in construction of the West Region
Point, so concrete structure or the performance built in plateau climate environment are just particularly important with durability.
However, being directed to the simulation test case of concrete test at present, mostly to control based on temperature and humidity, never considered
Influence of the plateau air pressure conditions to concrete performance and durability has made a test in the present invention as technical background
System carrys out simulated high altitude typical case's climatic environment condition, for performance and durability of the research concrete under plateau climate environmental condition
It lays the foundation.
Summary of the invention
The purpose of the present invention is to solve existing concrete test processes not to account for caused by the influence of air pressure
There is easy shrinkage cracking in concrete, and propose a kind of concrete examination for considering plateau effects of air pressure in practical applications
Tryoff and its test method.
It is a kind of consider plateau effects of air pressure concrete test case include:
Experiment casing, cover board, sealing ring, refrigeration machine, humidifier, dehumidifier, vacuum pump, control panel, refrigerator pipes, heating
Pipe, temperature and humidity and pressure transducer, multiple monitoring cameras and insulation board；
The top half setting monitoring camera and refrigerator pipes of experiment casing inner wall, refrigerator pipes pass through connecting tube connection test
Refrigeration machine outside cabinet；The lower half portion setting temperature and humidity and pressure transducer and heating tube of experiment casing inner wall；
Heating tube and refrigerator pipes are placed in experiment casing inner wall.
Humidifier, dehumidifier and vacuum pump pass through the lower half portion of connecting tube connection test cabinet respectively；
Insulation board is arranged in the outer wall surface of experiment casing, and control panel is arranged on insulation board；Control panel and refrigeration machine add
Wet machine, dehumidifier, vacuum pump, heating tube, temperature and humidity and pressure transducer are connected with monitoring camera signal；
Cover board is set in experiment casing, sealing ring is set between cover board and experiment casing.
A kind of specific steps of the test method for the concrete test case considering plateau effects of air pressure are as follows:
Step 1: need to concrete sample to be tested be put into experiment casing, pad upper seal after, cover sealing ring；
Step 2: target temperature, target humidity and target air pressure are set on the control panel, make the intracorporal temperature of chamber
When degree, humidity and air pressure reach the target temperature, target humidity and target air pressure of setting, start to test；
When target temperature is lower than Current Temperatures, the solenoid valve on refrigeration machine communicating pipe is opened in refrigeration machine work；Remaining electricity
Magnet valve is closed, and humidifier, dehumidifier, heating tube and vacuum pump stop working；
When target temperature is higher than Current Temperatures, heating tube work；All solenoid valves are turned off, humidifier, dehumidifier, system
Cold, refrigerator pipes and vacuum pump stop working；
When target humidity is lower than current humidity, the solenoid valve on dehumidifier communicating pipe is opened in dehumidifier work；Remaining electricity
Magnet valve is closed, and humidifier, heating tube, refrigeration machine, refrigerator pipes and vacuum pump stop working；
When target humidity is higher than current humidity, the solenoid valve on humidifier communicating pipe is opened in humidifier work；Remaining electricity
Magnet valve is closed, and dehumidifier, heating tube, refrigeration machine, refrigerator pipes and vacuum pump stop working；
When target air pressure is higher than current gas pressure, vacuum pump work opens the solenoid valve on vacuum pump communicating pipe；Remaining electricity
Magnet valve is closed, and humidifier, dehumidifier, heating tube, refrigeration machine and refrigerator pipes stop working；
Step 3: when off-test, open vacuum pump communicating pipe on solenoid valve, refrigerator pipes, heating tube, refrigeration machine,
Humidifier and dehumidifier vacuum pump stop working, and when the air pressure of cabinet to be tested is equal with atmospheric pressure, open organic glass envelope
Test test specimen is taken out in capping.
It is a kind of consider plateau effects of air pressure concrete test case include:
First cabinet, the second cabinet, vacuum pump, compressor, instrument stan, heater, dehumidifier, humidifier, the first fan,
Second fan, control panel, vacuum meter, cover board, sealing ring, the first connecting tube, the second connecting tube, third connecting tube, the 4th connect
Adapter tube, the 5th connecting tube and Temperature Humidity Sensor；
The first cabinet is arranged in the side of second cabinet, and vacuum pump and compressor is arranged in the other side；First cabinet passes through first
Connecting tube and the second connecting tube are connected to the second cabinet；Vacuum pump is connected to the second cabinet by third connecting tube, and compressor passes through
4th connecting tube is connected to the second cabinet with the 5th connecting tube；
Instrument stan is arranged in the inside of second cabinet, and instrument stan includes pedestal, the first laminate and the second laminate；On second laminate
Heater is set；The first fan is set close to the side of the first cabinet on first laminate, dehumidifying is set close to the side of vacuum pump
Machine；The second fan is set close to the side of the first cabinet on pedestal, dehumidifier is set close to the side of compressor；Second cabinet
Control panel is arranged in outer wall surface；Control panel and vacuum pump, compressor, heater, dehumidifier, humidifier and temperature and humidity sensing
The connection of device signal；
Vacuum meter is arranged in the outer wall surface of first cabinet, and Temperature Humidity Sensor is arranged on the inner wall of the first cabinet；
It is respectively set on first cabinet and the second cabinet between the first cabinet of cover board, the second cabinet and the cover board being respectively arranged
Sealing ring is respectively set；
It is equipped with out in first connecting tube, the second connecting tube, third connecting tube, the 4th connecting tube and the 5th connecting tube
It closes；
The position of corresponding first connecting tube is arranged in first fan, and corresponding second connecting tube is arranged in the second fan
The position of corresponding third connecting tube is arranged in position, dehumidifier, and the position of corresponding 4th connecting tube is arranged in humidifier.
The invention has the benefit that
1. this patent designs plateau climate environmental chamber, realize to the temperature of case vivo environment, humidity and air pressure
It automatically controls, compensates for the existing blank for not considering air pressure and influencing on concrete performance, to be mixed under the conditions of research plateau climate
Solidifying soil nature can lay the foundation.
2. obtaining air pressure and humidity to concrete shrinkage by the shrinkage test carried out in plateau climate environmental chamber
Affecting laws, for research concrete cracking provide basic theory support.
3. the influence rule by research plateau climate condition to performance indexess such as mechanical performance of concrete, endurance qualities
Rule, proposes the Life Prediction Model of concrete.
It is temperature (0 DEG C -60 DEG C), air pressure (0.5atm-1atm), relative humidity the invention proposes a kind of controlled condition
The plateau climate environmental chamber of (20%-100%), purpose are the performance of concrete under research simulation plateau climate environmental condition
With the performance indexess such as durability.
Detailed description of the invention
Fig. 1 is 1 figure of structure of chamber of the present invention；
Fig. 2 is that concrete shrinkage changes with time rule；
Fig. 3 is 2 figure of structure of chamber of the present invention.
Specific embodiment
Specific embodiment 1: a kind of concrete test case for considering plateau effects of air pressure, the consideration are high as shown in Figure 1
The concrete test case of former effects of air pressure includes:
Experiment casing 1, cover board 2, sealing ring 3, refrigeration machine 4, humidifier 5, dehumidifier 6, vacuum pump 7, control panel 8, system
Cold pipe 9, heating tube 10, temperature and humidity and pressure transducer 11, multiple monitoring cameras 12 and insulation board 13；
The top half setting monitoring camera 12 and refrigerator pipes 9 of 1 inner wall of experiment casing, refrigerator pipes 9 are connected by connecting tube
Refrigeration machine 4 outside logical experiment casing 1；The lower half portion of 1 inner wall of experiment casing is arranged temperature and humidity and pressure transducer 11 and adds
Heat pipe 10；
Humidifier 5, dehumidifier 6 and vacuum pump 7 pass through the lower half portion of connecting tube connection test cabinet 1 respectively；
Insulation board 13 is arranged in the outer wall surface of experiment casing 1, and control panel 8 is arranged on insulation board 13；Control panel 8 and system
Cold 4, humidifier 5, dehumidifier 6, vacuum pump 7, heating tube 10, temperature and humidity and pressure transducer 11 and 12 signal of monitoring camera
Connection；
Cover board 2 is set in experiment casing 1, sealing ring 3 is set between cover board 2 and experiment casing 1.
Specific embodiment 2: the present embodiment is different from the first embodiment in that: the refrigeration machine 4 passes through two
Connecting tube is connected to refrigerator pipes 9, and humidifier 5 passes through the lower half portion of two connecting tube connection test cabinets 1, and dehumidifier 6 passes through two
The lower half portion of a connecting tube connection test cabinet 1, vacuum pump 7 pass through the lower half portion of 1 connecting tube connection test cabinet 1.
Wherein, humidifier and dehumidifier are needed through two connecting tubes and experiment casing necklace, and it acts as make dry air and wet sky
Gas fast exchange improves the working efficiency of humidification and dehumidifying.
Other steps and parameter are same as the specific embodiment one.
Specific embodiment 3: the present embodiment is different from the first and the second embodiment in that: in the connecting tube
Equipped with solenoid valve.
Other steps and parameter are the same as one or two specific embodiments.
Specific embodiment 4: unlike one of present embodiment and specific embodiment one to three: the cover board 4
Material is glass, dome-shaped, and bottom surface circular diameter is 1m, a height of 15cm, with a thickness of 3mm.
Other steps and parameter are identical as one of specific embodiment one to three.
Specific embodiment 5: unlike one of present embodiment and specific embodiment one to four: the cabinet tries
Tryoff body 1 is stainless steel material, and shape is cylinder, diameter 1m, a height of 150cm, wall thickness 2mm.
Other steps and parameter are identical as one of specific embodiment one to four.
Specific embodiment 6: unlike one of present embodiment and specific embodiment one to five: the sealing ring 3
Material be silica gel, the internal diameter of gasket 3 is 0.95m, outer diameter 1.05m, with a thickness of 0.5cm.
Other steps and parameter are identical as one of specific embodiment one to five.
Specific embodiment 7: unlike one of present embodiment and specific embodiment one to six: the multiple prison
Controlling camera 12 is 6.
Other steps and parameter are identical as one of specific embodiment one to six.
Specific embodiment 8: a kind of test method based on concrete plateau climate environmental chamber includes following step
It is rapid:
Step 1: need to concrete sample to be tested be put into experiment casing 1, pad upper seal 14 after, cover sealing
Circle 3；
Step 2: target temperature, target humidity and target air pressure are set on the control panel, make the temperature in experiment casing 1
When degree, humidity and air pressure reach the target temperature, target humidity and target air pressure of setting, start to test；
When target temperature is lower than Current Temperatures, refrigeration machine 4 works, and opens the solenoid valve on 4 communicating pipe of refrigeration machine；Remaining
Solenoid valve is closed, and humidifier 5, dehumidifier 6, heating tube 10 and vacuum pump 7 stop working；It is worked by refrigeration machine 4 and refrigerator pipes 9
Temperature within the barrel is reduced to reach target temperature.
When target temperature is higher than Current Temperatures, heating tube 10 works；All solenoid valves are turned off, humidifier 5, dehumidifier
6, refrigeration machine 4, refrigerator pipes 9 and vacuum pump 7 stop working；It is worked by heating tube 10 and improves temperature within the barrel to reach target temperature
Degree.
When target humidity is lower than current humidity, dehumidifier 6 works, and opens the solenoid valve on 6 communicating pipe of dehumidifier；Remaining
Solenoid valve is closed, and humidifier 5, heating tube 10, refrigeration machine 4, refrigerator pipes 9 and vacuum pump 7 stop working；It is worked by dehumidifier 6
Humidity is in reduction bucket to reach target humidity.
When target humidity is higher than current humidity, humidifier 5 works, and opens the solenoid valve on 5 communicating pipe of humidifier；Remaining
Solenoid valve is closed, and dehumidifier 6, heating tube 10, refrigeration machine 4, refrigerator pipes 9 and vacuum pump 7 stop working；It is worked by humidifier 5
Humidity is in raising bucket to reach target humidity.
When target air pressure is higher than current gas pressure, vacuum pump 7 works, and opens the solenoid valve on 7 communicating pipe of vacuum pump；Remaining
Solenoid valve is closed, and humidifier 5, dehumidifier 6, heating tube 10, refrigeration machine 4 and refrigerator pipes 9 stop working；It is worked by vacuum pump 7
Humidity is in raising bucket to reach target humidity.
In the above manner, constituting a temperature controllable, humidity, the environmental control system of air pressure.
The instrument of above all of control temperature, humidity and air pressure, is controlled by panel operation system, solenoid valve is by face
The control of plate operating system, and after control environment reaches balance, temperature, humidity and air pressure can be carried out automatically by solenoid valve
Independent control.
Step 3: when off-test, the solenoid valve on 7 communicating pipe of vacuum pump, refrigerator pipes 9, heating tube 10, refrigeration are opened
Machine 4, humidifier 5 and 6 vacuum pump 7 of dehumidifier stop working, and when the air pressure of cabinet 1 to be tested is equal with atmospheric pressure, opening has
The envelope capping of machine glass, takes out test test specimen.
Specific embodiment 9: as shown in figure 3, a kind of concrete test case for considering plateau effects of air pressure, the consideration
The concrete test case of plateau effects of air pressure includes:
First cabinet A1, the second cabinet A2, vacuum pump A3, compressor A4, instrument stan A5, heater A6, dehumidifier A7, add
Wet machine A8, the first fan A9, the second fan A10, control panel A11, vacuum meter A12, cover board A13, sealing ring A14, first connect
Adapter tube A15, the second connecting tube A16, third connecting tube A17, the 4th connecting tube A18, the 5th connecting tube A19 and Temperature Humidity Sensor
A20；
The first cabinet A1 is arranged in the side of second cabinet A2, and vacuum pump A3 and compressor A4 is arranged in the other side；First cabinet
A1 is connected to by the first connecting tube A15 and the second connecting tube A16 with the second cabinet A2；Vacuum pump A3 passes through third connecting tube A17
It is connected to the second cabinet A2, compressor A4 is connected to the second cabinet A2 by the 4th connecting tube A18 and the 5th connecting tube A19；
Instrument stan A5 is arranged in the inside of second cabinet A2, and instrument stan A5 includes pedestal A5-1, the first laminate A5-2 and second
Laminate A5-3；Heater A6 is set on the second laminate A5-3；Close to the side of the first cabinet A1 setting the on first laminate A5-2
Dehumidifier A7 is arranged close to the side of vacuum pump A3 in one fan A9；Close to the side of the first cabinet A1 setting the on pedestal A5-1
Dehumidifier A7 is arranged close to the side of compressor A4 in two fan A10；Control panel A11 is arranged in the outer wall surface of second cabinet A2；
Control panel A11 and vacuum pump A3, compressor A4, heater A6, dehumidifier A7, humidifier A8 and Temperature Humidity Sensor A20 believe
Number connection；
Vacuum meter A12 is arranged in the outer wall surface of first cabinet A1, and Temperature Humidity Sensor is arranged on the inner wall of the first cabinet A1
A20；
The first cabinet of cover board A13 A1, the second cabinet A2 are respectively set on first cabinet A1 and the second cabinet A2 and respectively sets
Sealing ring A14 is respectively set between the cover board A13 set；
The first connecting tube A15, the second connecting tube A16, third connecting tube A17, the connection of the 4th connecting tube A18 and the 5th
Switch is equipped on pipe A19；
The position of corresponding first connecting tube A15 is arranged in the first fan A9, and the second fan A10 setting is corresponding second
The position of corresponding third connecting tube A17 is arranged in the position of connecting tube A16, dehumidifier A7, and humidifier A8 setting is the corresponding 4th
The position of connecting tube A18.
The material of the cover board A13 is glass, dome-shaped, and bottom surface circular diameter is 1m, a height of 25cm, with a thickness of 10mm.
The first cabinet A1 and the second cabinet A2 is stainless steel material, and shape is cylinder, and diameter 1m is a height of
1.5cm, wall thickness 10mm.
The material of the sealing ring A14 is silica gel, the internal diameter of gasket A14 is 0.95m, outer diameter 1.05m, with a thickness of
0.5cm。
Test method are as follows:
Step 1: need to concrete sample to be tested be put into the first cabinet A1, pad upper seal 14 after, cover cover board
After 13, the second cabinet A2 pad upper seal 14, cover board 13 is covered；
Step 2: closing the switch on third connecting tube A17, open other switches, and temperature, wet is arranged on the control panel
Degree and air pressure；
When temperature is arranged lower than Current Temperatures, two connecting tube A16, the 4th connecting tube A18 and the 5th connecting tube A19 are opened
Online switch, compressor 4 work, the second fan A10 work；
When temperature is arranged higher than Current Temperatures, the switch on the first connecting tube A15 is opened, heater A6 works, and first
Fan A9 work；
When humidity is arranged lower than current humidity, the switch on the first connecting tube A15 is opened, dehumidifier A7 works, and first
Fan A9 work；When humidity is arranged higher than current humidity, the switch on the second connecting tube A16 is opened, humidifier A8 works, the
Two fan A10 work；
The air pressure of setting is lower than current gas pressure, open the first connecting tube A15, the second connecting tube A16 and third connecting tube
Switch on A17, vacuum pump A3 work, the first fan A9 and the second fan A10 work.
Step 3: when off-test, opening all switches, to the first cabinet A1, the air pressure of the second cabinet A2 and atmospheric pressure
When power is equal, the cover board A13 of the first cabinet A1 is opened, takes out test test specimen.
Beneficial effects of the present invention are verified using following embodiment:
Embodiment one:
Preparation grade of compressive strength is C30 concrete sample, having a size of 100mm × 100mm × 400mm, concrete matched
Composition and division in a proportion is as shown in table 1.Wherein cement is PO42.5 ordinary portland cement；Flyash is assessed as I grade；Stone is 5mm-20mm
Continuous grading rubble；Sand is river sand, fineness modulus 2.9；Additive is polycarboxylic acids dehydragent；Water is drinking water.
1 concrete match ratio of table when 28 days intensity
It casts after concrete sample curing in the mold 1 day, is put into altitude environment simulation box together together with shrinking instrument after demoulding
In, shrinkage test is carried out in 6 kinds of different altitude environments of simulation box control, environmental parameter is as shown in table 2, duration of test runs
It is 1 year, test result is as shown in Figure 2.
The environmental parameter of 2 shrinkage test of table
As seen from Figure 2, for the concrete of same match ratio, air pressure and humidity to the affecting laws of concrete shrinkage
Obviously, air pressure is lower, humidity is lower, and the contraction of concrete is bigger.
The present invention can also have other various embodiments, without deviating from the spirit and substance of the present invention, this field
Technical staff makes various corresponding changes and modifications in accordance with the present invention, but these corresponding changes and modifications all should belong to
The protection scope of the appended claims of the present invention.
Claims (1)
1. a kind of concrete test case for considering plateau effects of air pressure, it is characterised in that: described to consider the mixed of plateau effects of air pressure
Solidifying soil chamber includes: the first cabinet (A1), the second cabinet (A2), vacuum pump (A3), compressor (A4), instrument stan (A5), adds
Hot device (A6), dehumidifier (A7), humidifier (A8), the first fan (A9), the second fan (A10), control panel (A11), vacuum
Table (A12), cover board (A13), sealing ring (A14), the first connecting tube (A15), the second connecting tube (A16), third connecting tube
(A17), the 4th connecting tube (A18), the 5th connecting tube (A19) and Temperature Humidity Sensor (A20)；
The first cabinet (A1) is arranged in the side of second cabinet (A2), and vacuum pump (A3) and compressor (A4) is arranged in the other side；First
Cabinet (A1) is connected to by the first connecting tube (A15) and the second connecting tube (A16) with the second cabinet (A2)；Vacuum pump (A3) passes through
Third connecting tube (A17) is connected to the second cabinet (A2), and compressor (A4) passes through the 4th connecting tube (A18) and the 5th connecting tube
(A19) it is connected to the second cabinet (A2)；
Instrument stan (A5) is arranged in the inside of second cabinet (A2), and instrument stan (A5) includes pedestal (A5-1), the first laminate (A5-2)
With the second laminate (A5-3)；Heater (A6) is set on second laminate (A5-3)；Close to the first cabinet on first laminate (A5-2)
(A1) the first fan (A9) is arranged in side, and dehumidifier (A7) is arranged close to the side of vacuum pump (A3)；It is leaned on pedestal (A5-1)
The second fan (A10) is arranged in the side of nearly first cabinet (A1), and dehumidifier (A7) is arranged close to the side of compressor (A4)；Second
Control panel (A11) is arranged in the outer wall surface of cabinet (A2)；Control panel (A11) and vacuum pump (A3), compressor (A4), heating
Device (A6), dehumidifier (A7), humidifier (A8) are connected with Temperature Humidity Sensor (A20) signal；
Vacuum meter (A12) is arranged in the outer wall surface of first cabinet (A1), and temperature and humidity sensing is arranged on the inner wall of the first cabinet (A1)
Device (A20)；
Be respectively set on first cabinet (A1) and the second cabinet (A2) the first cabinet of cover board (A13) (A1), the second cabinet (A2) with
Sealing ring (A14) is respectively set between the cover board (A13) being respectively arranged；
First connecting tube (A15), the second connecting tube (A16), third connecting tube (A17), the 4th connecting tube (A18) and the 5th
Switch is equipped in connecting tube (A19)；
First fan (A9) setting is in the position of corresponding first connecting tube (A15), and the second fan (A10) setting is corresponding the
The position of two connecting tubes (A16), dehumidifier (A7) setting is in the position of corresponding third connecting tube (A17), humidifier (A8) setting
In the position of corresponding 4th connecting tube (A18).
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