CN202814965U - Crack test device for concrete confined shrinkage rings - Google Patents
Crack test device for concrete confined shrinkage rings Download PDFInfo
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- CN202814965U CN202814965U CN201220457111.1U CN201220457111U CN202814965U CN 202814965 U CN202814965 U CN 202814965U CN 201220457111 U CN201220457111 U CN 201220457111U CN 202814965 U CN202814965 U CN 202814965U
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Abstract
The utility model discloses a crack test device for concrete confined shrinkage rings, and the crack test device comprises a confined shrinkage ring assembly, an automatic maintenance device and an intelligent measurement and control system, wherein the confined shrinkage ring assembly comprises a base plate, a confined shrinkage ring and a ring-shaped outer mold, and the inside surface of the outer mold is symmetrically provided with two sections of reverse arc molds; the automatic maintenance device comprises a maintenance box and an automatic temperature and humidity adjustment system, and the maintenance box is composed of a first box body and a second body which share a wall; and the intelligent measurement and control system comprises a micro strain sensor, a signal conditioning circuit module, a microprocessor module and a computer, the micro strain sensor, the signal conditioning circuit module and the microprocessor module are sequentially connected, the computer is connected with the microprocessor module and the automatic temperature and humidity adjustment system, and the signal conditioning circuit module is composed of an amplifying circuit module, a filter circuit module, signal time-sharing multiplexing module and an A/D (Analogue/Digital) conversion circuit module which are sequentially connected. The crack test device disclosed by the utility model is convenient to use and operate, high in test precision and high in reliability, and can be used for more scientifically evaluating the crack resistance of concrete, so that the crack test device has high popularization and application values.
Description
Technical field
The utility model relates to the crack-resistant performance of concrete technical field of measurement and test, especially relates to a kind of concrete restrained shrinkage annulus crazing-resistance test device.
Background technology
The concrete cracking problem is the key factor that affects concrete durability, on very important impact is arranged in serviceable life of xoncrete structure.The concrete works ubiquity problem of Cracking, traditional test evaluation method can only be by resistance to compression, tensile strength, elastic modulus, limit stretch value, drying shrinkage, creep, the concrete cracking resistance of single factor experiment evaluation of result such as adiabatic temperature rise, the cracking resistance computing formula is various, is difficult to the accurately concrete cracking resistance of evaluation.Thus, research cracking of reinforced concrete evaluation method has realistic meaning.
Nineteen forty-two, the RoyCarlson of Massachusetts Institute Technology (Mit) proposes ring method, is used for the Research on Crack Resistance of cement paste and mortar; 1988, R.W.Carlson used the cracking situation of the lower annulus specimen of ring method research different humidity condition (25%, 50%, 75%).KarlWiegrink and McDonald study concrete cracking with ring method under study for action, annulus size for RoyCarlson is improved, device is comprised of steel loop internal mold and tygon external mold, behind the specimen molding silicone rubber seal is used at the top, curing condition is 20 ℃, RH is 50%, uses custom-designed microscopic after the crack occurs, and can get cracking time of occurrence and fracture width that the limited contraction of concrete causes from this test.The cement annulus shrinkage test result that carries out of united states bureau of reclamation nineteen forty-three has forecast the quality condition of dam, green hill breastwork panel concrete after 53 years.
1999, U.S. civil engineer association (AASHTO) released the interim standard of a ring method, and suggestion descends (20～30 * 10 by being pasted on the strainometer monitoring strain of interior steel loop inboard when sudden change appears in the strain measured value
-6), i.e. cracking time is monitored in addition the cracking model in crack and fracture width and is drawn out free shrink curve without the constraint test specimen, the free shrink value of record cracking time; U.S. material is learned (ASTM) formulated relevant annulus split test in 2002 standard with test.
In addition, China's " durability design and construction guide " and " construction work crack mechanism and guideline of prevention and treatment " have been recommended annulus split test method.
Early stage annulus crazing-resistance test is multiplex in cement paste, has obtained good effect.Two class problems have appearred after changing concrete into, and the one, the diversity problem of concrete cracking, distress in concrete in a plurality of local appearance, the particularly concrete for hydraulic structure low to gel material content, even can occur indehiscent situation not local an appearance.The 2nd, the seizure problem of cracking time, concrete cracking does not reflect at automatic monitor sometimes.In addition, the annulus crazing-resistance test just makes concrete produce volumetric contraction under dry environment, and the restraint stress that is produced by rigidity constraint annulus makes the concrete circular ring opening, and load distribution characteristics and concrete for hydraulic structure are distinguished to some extent.
The utility model content
Technical problem to be solved in the utility model is for above-mentioned deficiency of the prior art, a kind of concrete restrained shrinkage annulus crazing-resistance test device is provided, it is simple in structure, reasonable in design, use simple operation, test accuracy is high, and reliability is high, can estimate concrete splitting resistance, application value is high more scientificly.
For solving the problems of the technologies described above, the technical solution adopted in the utility model is: a kind of concrete restrained shrinkage annulus crazing-resistance test device, it is characterized in that: comprise for the restrained shrinkage annulus assembly of concrete sample moulding with for the automatic maintenance equipment that concrete sample is carried out automatic maintenance, and be used for the intelligent observing and controlling system that the cracking resistance to concrete sample detects and is used for automatic maintenance equipment is monitored, described restrained shrinkage annulus assembly comprises base plate, be placed on restrained shrinkage annulus and the circular external mold that is sleeved on described restrained shrinkage annulus periphery on the base plate, be symmetrically arranged with two sections anti-arc moulds on the medial surface of described external mold, the two ends of every section described anti-arc mould all are fixedly connected with the inwall of described external mold; The humiture varitrol that described automatic maintenance equipment comprises curing box and is used for the humiture in the curing box is automatically adjusted, described curing box consists of by common wall setting and for the first casing of placing concrete sample with for the second casing of placing the humiture varitrol, described the first casing top is connected with case lid, described the first box house is provided with for the first box house spatial separation is become two-layer dividing plate, described the second casing front end is connected with chamber door, and the common wall between described the first casing and the second casing is provided with air inlet and the air outlet that is connected with described humiture varitrol; Described intelligent observing and controlling system comprises and is arranged on the microstrain sensor that described restrained shrinkage annulus ess-strain inboard and that be used for when concrete sample expanded with heat and contract with cold the restrained shrinkage annulus being produced detects, the signal conditioning circuit module of joining with the microstrain sensor and being used for the signal that the microstrain sensor detects is nursed one's health and join with the signal conditioning circuit module and be used for the signal of signal conditioning circuit module output is carried out the microprocessor module of analyzing and processing, and all join with microprocessor module and humiture varitrol and be used for microprocessor module is processed the computing machine that the data that obtain are carried out comprehensive analysis processing and the humiture varitrol is monitored, described signal conditioning circuit module is by the amplifying circuit module of joining successively, filter circuit module, signal time-sharing multiplex circuit module and A/D change-over circuit module composition.
Above-mentioned a kind of concrete restrained shrinkage annulus crazing-resistance test device, it is characterized in that: the external diameter of described restrained shrinkage annulus is 290mm～320mm, the thickness of described restrained shrinkage annulus is 6mm～10mm, and the height of described restrained shrinkage annulus is 80mm～150mm.
Above-mentioned a kind of concrete restrained shrinkage annulus crazing-resistance test device, it is characterized in that: described restrained shrinkage annulus is not more than 1.0 * 10 by temperature expansion coefficient
-6And elastic module is not less than the steel of 100GPa and makes.
Above-mentioned a kind of concrete restrained shrinkage annulus crazing-resistance test device, it is characterized in that: described restrained shrinkage annulus is made by invar.
Above-mentioned a kind of concrete restrained shrinkage annulus crazing-resistance test device, it is characterized in that: described humiture varitrol comprises the main controller module that joins by usb communication circuit module and described computing machine, the input end of described main controller module is connected to parameter input circuit module and signal acquisition circuit module, the humidity sensor that the input end of described signal acquisition circuit module is connected to for the temperature sensor that the temperature in the curing box is detected in real time and is used for the humidity in the curing box is detected in real time, the output terminal of described main controller module is connected to display module, the air circulation pump, electric heater, refrigeration plant, electric moistening device and dehumidification equipment, the entrance of described air circulation pump is connected with described air outlet with the first blower fan on being connected the first pipeline by the first pipeline, described air circulation delivery side of pump is connected with three-way valve by second pipe, an output port of described three-way valve is connected with refrigeration plant by the 3rd pipeline, another output port of described three-way valve is connected with the entrance of dehumidification equipment by the 4th pipeline, the outlet of described dehumidification equipment is connected with the 3rd pipeline by the 5th pipeline and the solenoid valve that is arranged on the 5th pipeline, described refrigeration plant is connected with electric heater by the 6th pipeline, described electric heater is connected with described air inlet with the second blower fan on being connected the 7th pipeline by the 7th pipeline, described the first blower fan, three-way valve, solenoid valve and the second blower fan all join with the output terminal of described main controller module, described temperature sensor, humidity sensor and electric moistening device all are arranged in described the first casing, described main controller module, the signal acquisition circuit module, the air circulation pump, electric heater, refrigeration plant and dehumidification equipment all are arranged in described the second casing, and described parameter input circuit module and display module be outer being exposed on the outside surface of described the second casing all.
Above-mentioned a kind of concrete restrained shrinkage annulus crazing-resistance test device, it is characterized in that: described refrigeration plant comprises the liquid coolant storage tank, the first air compressor, air-cooled coil condenser and fin type evaporator, the first entrance of described fin type evaporator is connected with the liquid coolant storage tank by drawing liquid pump, the entrance of described the first air compressor is connected with an output port of described three-way valve by the 3rd pipeline, the first outlet of described the first air compressor is connected with the second entrance of described fin type evaporator by the first fluid reservoir, the second outlet of described the first air compressor is connected with an end of described air-cooled coil condenser, the other end of described air-cooled coil condenser is connected to the second fluid reservoir successively, device for drying and filtering and expansion valve, two output ports of described expansion valve are connected with the 3rd entrance with the second entrance of described fin type evaporator respectively, the outlet of described fin type evaporator is connected with electric heater by the 6th pipeline, and the top of described air-cooled coil condenser is provided with cooling fan; Described the first air compressor, drawing liquid pump and cooling fan all join with the output terminal of described main controller module.
Above-mentioned a kind of concrete restrained shrinkage annulus crazing-resistance test device, it is characterized in that: described dehumidification equipment is rotary dehumidifier.
Above-mentioned a kind of concrete restrained shrinkage annulus crazing-resistance test device, it is characterized in that: be provided with watch window on the described case lid, described watch window place is equipped with hollow tempering glass window; Be connected with respectively between the both sides of the both sides of described case lid and described the first casing for the first cylinder and the second cylinder that aperture is regulated of opening to case lid, be provided with the second air compressor that is used to the first cylinder and the second cylinder air feed in described the second casing, the air intake opening of described the first cylinder be connected the air intake opening of cylinder respectively with the first outlet of described the second air compressor be connected to export and be connected, the output terminal of described the second air compressor and described main controller module joins.
The utility model compared with prior art has the following advantages:
1, the utility model is reasonable in design, and it is convenient to realize.
2, the utility model restrained shrinkage annulus adopts temperature expansion coefficient to be not more than 1.0 * 10
-6And the steel that elastic module is not less than 100GPa prepare the restrained shrinkage annulus, can well retrain at temperature-fall period concrete better.
3, be symmetrically arranged with two sections anti-arc moulds in the utility model on the medial surface of external mold, the design of anti-arc mould has reduced because concrete sample ftractures when inhomogeneous, and the problem that the diverse location testing differentia is large can the guiding crack position, makes test findings more accurate.
4, the utility model can be finished the cracking resistance test of concrete sample automatically by intelligent observing and controlling system and humiture varitrol are set, and intelligent degree is high, uses simple operation.
5, automatic maintenance equipment in the utility model consists of by curing box with for the humiture varitrol that the humiture in the curing box is automatically adjusted, curing box consists of by common wall setting and for the first casing of placing concrete sample with for the second casing of placing the humiture varitrol again, by designing the first casing and the second casing, concrete sample and humiture varitrol are separated setting, and regulate humiture in concrete sample the first casing of living in by being arranged on air inlet on the common wall between the first casing and the second casing and air outlet, than concrete sample and humiture varitrol are positioned in the same space, humiture in the first casing changes more even, the humiture situation of change that the simulation concrete test specimen is actual better when using helps to improve the reliability of test.
6, be provided with watch window on the utility model case lid, described watch window place is equipped with hollow tempering glass window, can in process of the test, observe the cracking situation of the first casing inner concrete test specimen by hollow tempering glass window, so that test more hommization.
7, the utility model refrigeration plant has adopted air-cooled coil condenser and fin type evaporator, two kinds of refrigeration modes of sweat cooling and wind-cooling heat dissipating have been realized, be convenient to realize energy adjustment and temperature control according to environment temperature better, played the effect of efficient energy-saving.
8, the ess-strain that the restrained shrinkage annulus is produced carries out periodicity detection, and by the amplifying circuit module, filter circuit module, signal time-sharing multiplex circuit module and A/D change-over circuit mould amplify the detected signal of each microstrain sensor, filtering and A/D conversion process, by microprocessor module signal is carried out digital filtering and multisensor data fusion processing again, can more accurately detect the stress-strain data of described restrained shrinkage annulus generation with the situation of change of humiture, and then more scientifically estimate concrete splitting resistance, thereby can make the evaluation that meets objective reality to concrete permanance better, to assessing the serviceable life of concrete works structure larger effect be arranged.
9, realization cost of the present utility model is low, and result of use is good, and application value is high.
In sum, the utility model is reasonable in design, uses simple operation, test accuracy is high, and reliability is high, can more scientifically estimate concrete splitting resistance, thereby can make the evaluation that meets objective reality to concrete permanance better, result of use is good, and application value is high.
Below by drawings and Examples, the technical solution of the utility model is described in further detail.
Description of drawings
Fig. 1 is the structural representation of the utility model except the second casing.
The structural representation of Fig. 2 the utility model curing box.
Fig. 3 is the vertical view of the utility model restrained shrinkage annulus assembly.
Fig. 4 is that the A-A of Fig. 3 attempts.
Fig. 5 is the utility model concrete sample and the installation position synoptic diagram of restrained shrinkage annulus assembly in the first casing.
Fig. 6 is the vertical view of Fig. 5.
Fig. 7 is the schematic block circuit diagram of the utility model intelligent observing and controlling system.
Fig. 8 is the schematic block circuit diagram of the utility model humiture varitrol.
Fig. 9 is the utility model temperature time history plot when carrying out the concrete sample crazing-resistance test.
Figure 10 is the stress-strain data time history plot that the utility model restrained shrinkage annulus produces.
Description of reference numerals:
1-base plate; 2-restrained shrinkage annulus; 3-external mold;
The 4-the first casing; The 5-the second casing; 6-case lid;
7-dividing plate; 8-chamber door; 9-microstrain sensor;
10-signal conditioning circuit module; 10-1-amplifying circuit module;
10-2-filter circuit module; 10-3-signal time-sharing multiplex circuit module;
10-4-A/D change-over circuit module; 11-computing machine;
12-main controller module; 13-parameter input circuit module;
14-signal acquisition circuit module; 15-temperature sensor;
16-humidity sensor; 17-display module; 18-air circulation pump;
19-electric heater; 20-1-liquid coolant storage tank;
20-2-first air compressor; 20-3-air-cooled coil condenser;
20-4-fin type evaporator; 20-5-first fluid reservoir; 20-6-second fluid reservoir;
20-7-device for drying and filtering; 20-8-expansion valve; 20-9-cooling fan;
20-10-drawing liquid pump; 21-electric moistening device; 22-dehumidification equipment;
The 23-the first pipeline; The 24-the first blower fan; 25-second pipe;
26-three-way valve; The 27-the three pipeline; The 28-the four pipeline;
The 29-the five pipeline; 30-solenoid valve; The 31-the six pipeline;
The 32-the seven pipeline; The 33-the second blower fan;
34-hollow tempering glass window; The 35-the first cylinder;
36-the second cylinder; 37-the second air compressor; The 38-concrete sample;
39-anti-arc mould; 40-microprocessor module; 41-usb communication circuit module.
Embodiment
Such as Fig. 1～shown in Figure 7, concrete restrained shrinkage annulus crazing-resistance test device described in the utility model, comprise for the restrained shrinkage annulus assembly of concrete sample 38 moulding with for the automatic maintenance equipment that concrete sample 38 is carried out automatic maintenance, and be used for the intelligent observing and controlling system that the cracking resistance to concrete sample 38 detects and is used for automatic maintenance equipment is monitored, described restrained shrinkage annulus assembly comprises base plate 1, be placed on restrained shrinkage annulus 2 and the circular external mold 3 that is sleeved on described restrained shrinkage annulus 2 peripheries on the base plate 1, be symmetrically arranged with two sections anti-arc moulds 39 on the medial surface of described external mold 3, the two ends of every section described anti-arc mould 39 all are fixedly connected with the inwall of described external mold 3; The humiture varitrol that described automatic maintenance equipment comprises curing box and is used for the humiture in the curing box is automatically adjusted, described curing box consists of by common wall setting and for the first casing 4 of placing concrete sample 38 with for the second casing 5 of placing the humiture varitrol, described the first casing 4 tops are connected with case lid 6, described the first casing 4 inside are provided with for the first casing 4 inner spaces are separated into two-layer dividing plate 7, described the second casing 5 front ends are connected with chamber door 8, and the common wall between described the first casing 4 and the second casing 5 is provided with air inlet and the air outlet that is connected with described humiture varitrol; Described intelligent observing and controlling system comprises and is arranged on the microstrain sensor 9 that described restrained shrinkage annulus 2 ess-strain inboard and that be used for when concrete sample 38 expanded with heat and contract with cold restrained shrinkage annulus 2 being produced detects, the signal conditioning circuit module 10 of joining with microstrain sensor 9 and being used for the signal that microstrain sensor 9 detects is nursed one's health and join with signal conditioning circuit module 10 and be used for the signal of signal conditioning circuit module 10 outputs is carried out the microprocessor module 40 of analyzing and processing, and all join with microprocessor module 40 and humiture varitrol and be used for microprocessor module 40 is processed the computing machine 11 that the data that obtain are carried out comprehensive analysis processing and the humiture varitrol is monitored, described signal conditioning circuit module 10 is by the amplifying circuit module 10-1 that joins successively, filter circuit module 10-2, signal time-sharing multiplex circuit module 10-3 and A/D change-over circuit module 10-4 consist of.
In the present embodiment, the external diameter of described restrained shrinkage annulus 2 is 290mm～320mm, and the thickness of described restrained shrinkage annulus 2 is 6mm～10mm, and the height of described restrained shrinkage annulus 2 is 80mm～150mm.Described restrained shrinkage annulus 2 is not more than 1.0 * 10 by temperature expansion coefficient
-6And elastic module is not less than the steel of 100GPa and makes.Particularly, described restrained shrinkage annulus 2 is made by invar.
In conjunction with Fig. 8, in the present embodiment, described humiture varitrol comprises the main controller module 12 that joins by usb communication circuit module 41 and described computing machine 11, the input end of described main controller module 12 is connected to parameter input circuit module 13 and signal acquisition circuit module 14, the humidity sensor 16 that the input end of described signal acquisition circuit module 14 is connected to for the temperature sensor 15 that the temperature in the curing box is detected in real time and is used for the humidity in the curing box is detected in real time, the output terminal of described main controller module 12 is connected to display module 17, air circulation pump 18, electric heater 19, refrigeration plant, electric moistening device 21 and dehumidification equipment 22, the entrance of described air circulation pump 18 is connected with described air outlet with the first blower fan 24 on being connected the first pipeline 23 by the first pipeline 23, the outlet of described air circulation pump 18 is connected with three-way valve 26 by second pipe 25, an output port of described three-way valve 26 is connected with refrigeration plant by the 3rd pipeline 27, another output port of described three-way valve 26 is connected with the entrance of dehumidification equipment 22 by the 4th pipeline 28, the outlet of described dehumidification equipment 22 is connected with the 3rd pipeline 27 by the 5th pipeline 29 and the solenoid valve 30 that is arranged on the 5th pipeline 29, described refrigeration plant is connected with electric heater 19 by the 6th pipeline 31, described electric heater 19 is connected with described air inlet with the second blower fan 33 on being connected the 7th pipeline 32 by the 7th pipeline 32, described the first blower fan 24, three-way valve 26, solenoid valve 30 and the second blower fan 33 all join with the output terminal of described main controller module 12, described temperature sensor 15, humidity sensor 16 and electric moistening device 21 all are arranged in described the first casing 4, described main controller module 12, signal acquisition circuit module 14, air circulation pump 18, electric heater 19, refrigeration plant and dehumidification equipment 22 all are arranged in described the second casing 5, and described parameter input circuit module 13 and display module 17 be outer being exposed on the outside surface of described the second casing 5 all.
As shown in Figure 1, in the present embodiment, described refrigeration plant comprises liquid coolant storage tank 20-1, the first air compressor 20-2, air-cooled coil condenser 20-3 and fin type evaporator 20-4, the first entrance of described fin type evaporator 20-4 is connected with liquid coolant storage tank 20-1 by drawing liquid pump 20-10, the entrance of described the first air compressor 20-2 is connected with an output port of described three-way valve 26 by the 3rd pipeline 27, the first outlet of described the first air compressor 20-2 is connected with the second entrance of described fin type evaporator 20-4 by the first fluid reservoir 20-5, the second outlet of described the first air compressor 20-2 is connected with the end of described air-cooled coil condenser 20-3, the other end of described air-cooled coil condenser 20-3 is connected to the second fluid reservoir 20-6 successively, device for drying and filtering 20-7 and expansion valve 20-8, two output ports of described expansion valve 20-8 are connected with the 3rd entrance with the second entrance of described fin type evaporator 20-4 respectively, the outlet of described fin type evaporator 20-4 is connected with electric heater 19 by the 6th pipeline 31, and the top of described air-cooled coil condenser 20-3 is provided with cooling fan 20-9; Described the first air compressor 20-2, drawing liquid pump 20-10 and cooling fan 20-9 all join with the output terminal of described main controller module 12.Described dehumidification equipment 22 is rotary dehumidifier.
Such as Fig. 2 and shown in Figure 8, in the present embodiment, be provided with watch window on the described case lid 6, described watch window place is equipped with hollow tempering glass window 34; Be connected with respectively between the both sides of the both sides of described case lid 6 and described the first casing 4 for the first cylinder 35 and the second cylinder 36 that aperture is regulated of opening to case lid 6, be provided with the second air compressor 37 that is used to the first cylinder 35 and the second cylinder 36 air feed in described the second casing 5, the air intake opening of described the first cylinder 35 be connected the air intake opening of cylinder 36 and be connected with the first outlet of described the second air compressor 37 and the outlet of being connected respectively, the output terminal of described the second air compressor 37 and described main controller module 12 joins.
The method that adopts concrete restrained shrinkage annulus crazing-resistance test device described in the utility model to carry out the crazing-resistance test of concrete restrained shrinkage annulus may further comprise the steps:
Situation one, humidity is constant, concrete sample 38 cracking resistances test during temperature variation: the humiture in the curing box is automatically adjusted by the humiture varitrol, at first, so that the humidity in the described curing box remains on 95% always, and so that the temperature in the described curing box keep 14.8 ℃ one hour, then, so that temperature each hour in the described curing box raises 1 ℃, until the temperature in the described curing box is elevated to 22.8 ℃ and kept one hour, then, so that the temperature in the described curing box is elevated to 23.6 ℃ successively, 26 ℃, 29 ℃, 30.5 ℃, 35.8 ℃ and 30 ℃ and each self-sustaining 160 minutes, 440 minutes, 2 hours, 24 hours, 21 hours and 1 hour, at last, so that temperature each hour in the described curing box reduce by 1 ℃, until the temperature in the described curing box is reduced to 5 ℃;
Situation two, concrete sample 38 cracking resistances test when temperature and humidity all changes: the humiture in the curing box is automatically adjusted by the humiture varitrol, at first, so that the humidity in the described curing box remains on 95%, and so that the temperature in the described curing box keep 14.8 ℃ one hour, then, so that temperature each hour in the described curing box raises 1 ℃, until the temperature in the described curing box is elevated to 22.8 ℃ and kept one hour, then, so that the temperature in the described curing box is elevated to 23.6 ℃ successively, 26 ℃, 29 ℃, 30.5 ℃, 35.8 ℃ and 30 ℃ and each self-sustaining 160 minutes, 440 minutes, 2 hours, 24 hours, 21 hours and 1 hour, at last, so that being reduced to 20%～30%, the humidity in the described curing box also keeps constant always, and simultaneously so that temperature each hour in the described curing box reduce by 1 ℃, until the temperature in the described curing box is reduced to 5 ℃;
In the above humiture change procedure, when the time of described concrete sample 38 in the first casing 4 reaches 24h～48h, remove external mold 3 and anti-arc mould 39 that concrete sample 38 peripheries are connected to one, keep the concrete sample 38 and the restrained shrinkage annulus 2 that are solidified as one; Wherein, the time dependent situation of temperature is as shown in table 1:
Table 1 temperature temporal evolution table
| Time (min) | 0 | 60 | 120 | 180 | 240 | 300 | 360 | 420 |
| Temperature (℃) | 14.8 | 15.8 | 16.8 | 17.8 | 18.8 | 19.8 | 20.8 | 21.8 |
| Time (min) | 480 | 540 | 700 | 1140 | 1260 | 2700 | 3960 | 4020 |
| Temperature (℃) | 22.8 | 23.6 | 26 | 29 | 30.5 | 35.8 | 30 | 29 |
| Time (min) | 4080 | 4140 | 4200 | 4260 | 4320 | 4380 | 4440 | 4500 |
| Temperature (℃) | 28 | 27 | 26 | 25 | 24 | 23 | 22 | 21 |
| Time (min) | 4560 | 4620 | 4680 | 4740 | 4800 | 4860 | 4920 | 4980 |
| Temperature (℃) | 20 | 19 | 18 | 17 | 16 | 15 | 14 | 13 |
| Time (min) | 5040 | 5100 | 5160 | 5220 | 5280 | 5340 | 5400 | 5460 |
| Temperature (℃) | 12 | 11 | 10 | 9 | 8 | 7 | 6 | 5 |
Temperature T (℃) curve that changes of t (min) is as shown in Figure 9 in time.
More than under two kinds of different humiture situations of change, the periodicity of carrying out the ess-strain that a plurality of microstrain sensors 9 produce restrained shrinkage annulus 2 when in real time concrete sample 38 being expanded with heat and contract with cold detects and detected signal is exported to signal conditioning circuit module 10, the signal that signal conditioning circuit module 10 is exported each microstrain sensor 9 amplifies, export to microprocessor module 40 after filtering and the A/D conversion process, at first, described microprocessor module 40 calls the middle position value filtering module and according to the middle position value filtering method of routine, each microstrain sensor 9 detected signals after processing through signal conditioning circuit module 10 is carried out middle position value filtering process; Then, described microprocessor module 40 calls the multisensor data fusion processing module and according to the adaptive weighting data fusion algorithm of routine a plurality of microstrain sensor 9 detected signals after middle position value filtering is processed is carried out multisensor data fusion processing, and the stress-strain data of described restrained shrinkage annulus 2 generations of corresponding acquisition, obtain the stress-strain data that each microstrain sensor 9 detected restrained shrinkage annulus 2 after filtering is processed produce; Then, described microprocessor module 40 stress-strain data that each microstrain sensor 9 detected restrained shrinkage annulus 2 after filtering is processed of its acquisition are produced is exported to computing machine 11 and is shown;
In the present embodiment, under the second humiture situation of change, the stress-strain data that 1# microstrain sensor 9 after filtering is processed and 2# microstrain sensor 9 detected first restrained shrinkage annulus 2 produce, and the stress-strain data of the 3# microstrain sensor 9 after filtering is processed and 9 detected second restrained shrinkage annulus, 2 generations of 4# microstrain sensor is as shown in table 2:
The stress-strain data table of table 21#, 2#, 3# and 4# microstrain sensor 9
| t（min） | 1# | 2# | 3# | 4# |
| 0 | 0 | 0 | 0 | 0 |
| 5 | 0 | 0 | 0 | 0 |
| 10 | 0 | 0 | 2.4 | 1.6 |
| 15 | 0.8×10 -6 | 1.6×10 -6 | 2.4×10 -6 | 1.6×10 -6 |
| 20 | 2.4×10 -6 | 1.6×10 -6 | 2.4×10 -6 | 2.4×10 -6 |
| 25 | 4.8×10 -6 | 2.4×10 -6 | 2.4×10 -6 | 2.4×10 -6 |
| 30 | 5.6×10 -6 | 4.8×10 -6 | 4.8×10 -6 | 4.8×10 -6 |
| 35 | 6.4×10 -6 | 4.8×10 -6 | 5.6×10 -6 | 4.8×10 -6 |
| 40 | 6.4×10 -6 | 6.4×10 -6 | 5.6×10 -6 | 5.6×10 -6 |
| 45 | 8×10 -6 | 6.4×10 -6 | 6.4×10 -6 | 5.6×10 -6 |
| 50 | 8×10 -6 | 7.2×10 -6 | 6.4×10 -6 | 5.6×10 -6 |
| 55 | 8.8×10 -6 | 8×10 -6 | 6.4×10 -6 | 6.4×10 -6 |
| … | … | … | … | … |
| 5415 | -136.9×10 -6 | -150.6×10 -6 | -116.1×10 -6 | -136.9×10 -6 |
| 5420 | -136.9×10 -6 | -151.4×10 -6 | -116.9×10 -6 | -136.9×10 -6 |
| 5425 | -136.9×10 -6 | -150.6×10 -6 | -117.7×10 -6 | -137.7×10 -6 |
| 5430 | -137.7×10 -6 | -150.6×10 -6 | -116.9×10 -6 | -138.5×10 -6 |
| 5435 | -137.7×10 -6 | -151.4×10 -6 | -116.9×10 -6 | -138.5×10 -6 |
| 5440 | -137.7×10 -6 | -151.4×10 -6 | -117.7×10 -6 | -138.5×10 -6 |
| 5445 | -138.5×10 -6 | -152.2×10 -6 | -118.5×10 -6 | -139.3×10 -6 |
| 5450 | -138.5×10 -6 | -153×10 -6 | -118.5×10 -6 | -138.5×10 -6 |
| 5455 | -138.5×10 -6 | -153×10 -6 | -118.5×10 -6 | -138.5×10 -6 |
| 5460 | -139.3×10 -6 | -153×10 -6 | -119.3×10 -6 | -138.5×10 -6 |
At last, described computing machine 11 calling data comprehensive analysis processing modules are carried out comprehensive analysis processing to the stress-strain data that its described restrained shrinkage annulus that receives 2 produces, obtain the time dependent curve of stress-strain data that described restrained shrinkage annulus 2 produces, when the stress-strain data of described restrained shrinkage annulus 2 generations is undergone mutation, illustrate that cracking has occured concrete sample 38, at this moment, record the time of concrete sample 38 crackings.If concrete sample 38 does not ftracture, operating personnel just evaluate crack-resistant performance of concrete with the time dependent curve of stress-strain data that restrained shrinkage annulus 2 produces, if concrete sample 38 has ftractureed, operating personnel just evaluate crack-resistant performance of concrete with the time of concrete sample 38 crackings, and fracture width can adopt the mode of artificial microscope reading to observe.
In the present embodiment, stress-strain data in the described computing machine 11 calling data comprehensive analysis processing module his-and-hers watches 2 carries out comprehensive analysis processing, obtain the time dependent curve of stress-strain data that 1 # microstrain sensor 9 and 2# microstrain sensor 9 detected first restrained shrinkage annulus 2 produce, and the curve of in time t (min) variation of stress-strain data K of 3 # microstrain sensor 9 and 9 detected second restrained shrinkage annulus, 2 generations of 4# microstrain sensor as shown in figure 10.
Can analyze from the data of table 2 and Figure 10 and to draw: tab does not occur in the stress-strain data that 1 # microstrain sensor 9 and 2# microstrain sensor 9 detected first restrained shrinkage annulus 2 produce, tab does not occur in the stress-strain data that 3 # microstrain sensor 9 and 4# microstrain sensor 9 detected second restrained shrinkage annulus 2 produce yet, and illustrates with the first concrete sample 38 of first restrained shrinkage annulus 2 with the equal cracking not of the second concrete sample 38 of second restrained shrinkage annulus 2.Operating personnel can evaluate the concrete cracking resistance that consists of the first concrete sample 38 and the second concrete sample 38 with the curve among Figure 10.
Two kinds of different humiture situations of change that adopt in the utility model step 4 are temperature rise processes of having simulated mass concrete reality, more meet concrete actual loading situation, and are very representative, help to improve the accuracy and reliability of test.
The above; it only is preferred embodiment of the present utility model; be not that the utility model is imposed any restrictions; every any simple modification, change and equivalent structure of above embodiment being done according to the utility model technical spirit changes, and all still belongs in the protection domain of technical solutions of the utility model.
Claims (8)
1. concrete restrained shrinkage annulus crazing-resistance test device, it is characterized in that: comprise for the restrained shrinkage annulus assembly of concrete sample (38) moulding with for the automatic maintenance equipment that concrete sample (38) is carried out automatic maintenance, and be used for the intelligent observing and controlling system that the cracking resistance to concrete sample (38) detects and is used for automatic maintenance equipment is monitored, described restrained shrinkage annulus assembly comprises base plate (1), be placed on the restrained shrinkage annulus (2) on the base plate (1) and be sleeved on the peripheral circular external mold (3) of described restrained shrinkage annulus (2), be symmetrically arranged with two sections anti-arc moulds (39) on the medial surface of described external mold (3), the two ends of every section described anti-arc mould (39) all are fixedly connected with the inwall of described external mold (3); The humiture varitrol that described automatic maintenance equipment comprises curing box and is used for the humiture in the curing box is automatically adjusted, described curing box consists of by common wall setting and for the first casing (4) of placing concrete sample (38) with for the second casing (5) of placing the humiture varitrol, described the first casing (4) top is connected with case lid (6), described the first casing (4) inside is provided with for the first casing (4) inner space is separated into two-layer dividing plate (7), described the second casing (5) front end is connected with chamber door (8), is positioned on the common wall between described the first casing (4) and the second casing (5) to be provided with air inlet and the air outlet that is connected with described humiture varitrol; Described intelligent observing and controlling system comprises the microstrain sensor (9) that is arranged on described restrained shrinkage annulus (2) inboard and is used for concrete sample (38) makes restrained shrinkage annulus (2) produce when expanding with heat and contract with cold ess-strain is detected, the signal conditioning circuit module (10) of joining with microstrain sensor (9) and being used for the signal that microstrain sensor (9) detects is nursed one's health and join with signal conditioning circuit module (10) and be used for the signal of signal conditioning circuit module (10) output is carried out the microprocessor module (40) of analyzing and processing, and with microprocessor module (40) with the humiture varitrol is all joined and be used for microprocessor module (40) is processed the computing machine (11) that the data that obtain are carried out comprehensive analysis processing and the humiture varitrol is monitored, described signal conditioning circuit module (10) is by the amplifying circuit module (10-1) of joining successively, filter circuit module (10-2), signal time-sharing multiplex circuit module (10-3) and A/D change-over circuit module (10-4) consist of.
2. according to a kind of concrete restrained shrinkage annulus crazing-resistance test device claimed in claim 1, it is characterized in that: the external diameter of described restrained shrinkage annulus (2) is 290mm～320mm, the thickness of described restrained shrinkage annulus (2) is 6mm～10mm, and the height of described restrained shrinkage annulus (2) is 80mm～150mm.
3. according to a kind of concrete restrained shrinkage annulus crazing-resistance test device claimed in claim 1, it is characterized in that: described restrained shrinkage annulus (2) is not more than 1.0 * 10 by temperature expansion coefficient
-6And elastic module is not less than the steel of 100GPa and makes.
4. according to a kind of concrete restrained shrinkage annulus crazing-resistance test device claimed in claim 3, it is characterized in that: described restrained shrinkage annulus (2) is made by invar.
5. according to a kind of concrete restrained shrinkage annulus crazing-resistance test device claimed in claim 1, it is characterized in that: described humiture varitrol comprises the main controller module (12) that joins by usb communication circuit module (41) and described computing machine (11), the input end of described main controller module (12) is connected to parameter input circuit module (13) and signal acquisition circuit module (14), the humidity sensor (16) that the input end of described signal acquisition circuit module (14) is connected to for the temperature sensor that the temperature in the curing box is detected in real time (15) and is used for the humidity in the curing box is detected in real time, the output terminal of described main controller module (12) is connected to display module (17), air circulation pump (18), electric heater (19), refrigeration plant, electric moistening device (21) and dehumidification equipment (22), the entrance of described air circulation pump (18) is connected with described air outlet with the first blower fan (24) on being connected the first pipeline (23) by the first pipeline (23), the outlet of described air circulation pump (18) is connected with three-way valve (26) by second pipe (25), an output port of described three-way valve (26) is connected with refrigeration plant by the 3rd pipeline (27), another output port of described three-way valve (26) is connected with the entrance of dehumidification equipment (22) by the 4th pipeline (28), the outlet of described dehumidification equipment (22) is connected with the 3rd pipeline (27) by the 5th pipeline (29) and the solenoid valve (30) that is arranged on the 5th pipeline (29), described refrigeration plant is connected with electric heater (19) by the 6th pipeline (31), described electric heater (19) is connected with described air inlet with the second blower fan (33) on being connected the 7th pipeline (32) by the 7th pipeline (32), described the first blower fan (24), three-way valve (26), solenoid valve (30) and the second blower fan (33) all join with the output terminal of described main controller module (12), described temperature sensor (15), humidity sensor (16) and electric moistening device (21) all are arranged in described the first casing (4), described main controller module (12), signal acquisition circuit module (14), air circulation pump (18), electric heater (19), refrigeration plant and dehumidification equipment (22) all are arranged in described the second casing (5), and described parameter input circuit module (13) and display module (17) be outer being exposed on the outside surface of described the second casing (5) all.
6. according to a kind of concrete restrained shrinkage annulus crazing-resistance test device claimed in claim 5, it is characterized in that: described refrigeration plant comprises liquid coolant storage tank (20-1), the first air compressor (20-2), air-cooled coil condenser (20-3) and fin type evaporator (20-4), the first entrance of described fin type evaporator (20-4) is connected with liquid coolant storage tank (20-1) by drawing liquid pump (20-10), the entrance of described the first air compressor (20-2) is connected with an output port of described three-way valve (26) by the 3rd pipeline (27), the first outlet of described the first air compressor (20-2) is connected with the second entrance of described fin type evaporator (20-4) by the first fluid reservoir (20-5), the second outlet of described the first air compressor (20-2) is connected with an end of described air-cooled coil condenser (20-3), the other end of described air-cooled coil condenser (20-3) is connected to the second fluid reservoir (20-6) successively, device for drying and filtering (20-7) and expansion valve (20-8), two output ports of described expansion valve (20-8) are connected with the 3rd entrance with the second entrance of described fin type evaporator (20-4) respectively, the outlet of described fin type evaporator (20-4) is connected with electric heater (19) by the 6th pipeline (31), and the top of described air-cooled coil condenser (20-3) is provided with cooling fan (20-9); Described the first air compressor (20-2), drawing liquid pump (20-10) and cooling fan (20-9) all join with the output terminal of described main controller module (12).
7. according to a kind of concrete restrained shrinkage annulus crazing-resistance test device claimed in claim 5, it is characterized in that: described dehumidification equipment (22) is rotary dehumidifier.
8. according to a kind of concrete restrained shrinkage annulus crazing-resistance test device claimed in claim 1, it is characterized in that: described case lid is provided with watch window on (6), and described watch window place is equipped with hollow tempering glass window (34); Be connected with respectively between the both sides of the both sides of described case lid (6) and described the first casing (4) for the first cylinder (35) and the second cylinder (36) that aperture is regulated of opening to case lid (6), be provided with the second air compressor (37) that is used to the first cylinder (35) and the second cylinder (36) air feed in described the second casing (5), the air intake opening of described the first cylinder (35) be connected the air intake opening of cylinder (36) and be connected with the first outlet of described the second air compressor (37) and the outlet of being connected respectively, the output terminal of described the second air compressor (37) and described main controller module (12) joins.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201220457111.1U CN202814965U (en) | 2012-09-09 | 2012-09-09 | Crack test device for concrete confined shrinkage rings |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201220457111.1U CN202814965U (en) | 2012-09-09 | 2012-09-09 | Crack test device for concrete confined shrinkage rings |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102798707A (en) * | 2012-09-09 | 2012-11-28 | 中国水利水电第三工程局有限公司 | Concrete restrained contraction ring crack resistance test device and test method |
| CN108535459A (en) * | 2018-05-03 | 2018-09-14 | 华南理工大学 | A kind of crack resistance |
| CN109061118A (en) * | 2018-07-24 | 2018-12-21 | 华南理工大学 | A kind of test device of quick measurement concrete early-stage crack resistance |
| CN109975346A (en) * | 2019-04-24 | 2019-07-05 | 中国水利水电第三工程局有限公司 | Concrete sample temperature crazing-resistance test device and test method |
| CN113532691A (en) * | 2021-07-15 | 2021-10-22 | 威海建设集团股份有限公司 | Bulky concrete temperature automatic acquisition and cooling processing system thereof |
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2012
- 2012-09-09 CN CN201220457111.1U patent/CN202814965U/en not_active Expired - Lifetime
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102798707A (en) * | 2012-09-09 | 2012-11-28 | 中国水利水电第三工程局有限公司 | Concrete restrained contraction ring crack resistance test device and test method |
| CN102798707B (en) * | 2012-09-09 | 2014-08-13 | 中国水利水电第三工程局有限公司 | Concrete restrained contraction ring crack resistance test device and test method |
| CN108535459A (en) * | 2018-05-03 | 2018-09-14 | 华南理工大学 | A kind of crack resistance |
| CN109061118A (en) * | 2018-07-24 | 2018-12-21 | 华南理工大学 | A kind of test device of quick measurement concrete early-stage crack resistance |
| CN109975346A (en) * | 2019-04-24 | 2019-07-05 | 中国水利水电第三工程局有限公司 | Concrete sample temperature crazing-resistance test device and test method |
| CN113532691A (en) * | 2021-07-15 | 2021-10-22 | 威海建设集团股份有限公司 | Bulky concrete temperature automatic acquisition and cooling processing system thereof |
| CN113532691B (en) * | 2021-07-15 | 2024-05-28 | 威海建设集团股份有限公司 | Automatic temperature collection and cooling treatment system for mass concrete |
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