CN103063515B - Tensile creep test device for cement-based materials - Google Patents
Tensile creep test device for cement-based materials Download PDFInfo
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- CN103063515B CN103063515B CN201210559002.5A CN201210559002A CN103063515B CN 103063515 B CN103063515 B CN 103063515B CN 201210559002 A CN201210559002 A CN 201210559002A CN 103063515 B CN103063515 B CN 103063515B
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Abstract
The invention discloses a tensile creep test device for cement-based materials. The tensile creep test device for the cement-based materials comprises a gate-type machine pillar, a gate-type loading host machine, an environmental box, a device for casting concrete samples and a linear variable differential transformer (LVDT) rectilinear sensor, wherein the gate-type machine pillar is connected with the gate-type loading host machine, the environmental box and the gate-type loading host machine are centered, a temperature and humidity control system is arranged inside the environmental box, the device for casting the concrete samples is drawn longitudinally by the gate-type loading host machine, and the LVDT rectilinear sensor is hanged on the device for casting the concrete samples.
Description
Technical field
The invention belongs to technical field of measurement and test, be specifically related to a kind of cement-based material tensile creep test device of Temperature and Humidity Control.
Background technology
Humiture environment develops the intensity of cement-based material and modulus, volume change etc. has very important impact.Study creeping of concrete creeping, particularly early-age concrete, be necessary the epidemic disaster of Control experiment environment.Conventional Creep Apparatus only can control load.Thus, experimental enviroment is limited to indoor temperature and humidity.
The Material Testing Machine of universal Material Testing Machine both domestic and external and some band compact temperature environmental cabinets can simulate high temperature, as US5015825 (Furnace for Tensile/ Fatigue), and low temperature, as US5105626A (Apparatus for Measuring Tensile andCompressive Properties of Solid Materials at Cryogenic Temperatures).But this kind equipment can not be permanently effective controlled humidity meet the creep test reaching several weeks.And large-scale environment room, fog room cost and the maintenance expense placing creep test equipment is high.
Combining environmental case and loading equipemtn are in the difficulty of one: (1) can the controllable temperature wet environment casing of long-term work long-pending comparatively large, loading equipemtn size Selection leeway is less; (2) local details such as this two system of matching needs the Frame Design of system, punches, piece fixture to environmental cabinet, web member require higher.The connection of multispecimen and centering (co-axially aligned) require higher for workholder.Some inventions in recent years, as the environmental cabinet that CN201149588Y (pavement concrete environmental simulation and performance testing device) and CN202083409U (a kind of protective housing of test bench in environmental test chamber) has function stronger, but all need loading equipemtn to be placed in environmental cabinet, take valuable interior case space, when using it for cement-based material creep test, cause the volume of loading equipemtn larger.
Loading about tensile creep instrument can be divided into static loading and dynamic load.Static loading equipment is often referred to by carry counterweight then by lever amplification (as shown in Figure 1).Voltage stabilizing ability is incomparable, and cost is lower.But this equipment cannot realize small dynamic load unloading and displacement model loads, and purposes is very limited.For mixed earth creep test, this means that this type of frame of creeping cannot record the material property (as tensile strength, elastic modulus etc.) for simulating the necessity of creeping.Dynamic load equipment by mobility aid, servomechanism controller, data feedback system, and computer composition.Mobility aid has hydraulic piston also to have pneumatic piston form and motor-type, and the movement of piston regulates (as shown in Figure 2) by servo-valve.Computer (passing through control panel) and servo-valve are linked up, sensor collection dynamic data feedback to the computer, the closed loop of a formation synchronous observing and controlling.Such loading equipemtn is applicable to multiple test.The ability of voltage stabilizing that let it be to the greatest extent, maintenance load loads not as static (counterweight), but along with process technology progress, dynamic load equipment will be more universal.
Have both at home and abroad yet and consider the environmental simulation equipment of advanced person and external closed circuit loading equipemtn to combine, but they not be Analysis of Concrete Tensile creep test and designing.As being suitable for the smoky environment device of CN201589746U(mono-kind for experiment on fatigue properties of metal material), its environmental cabinet is a closed box being fixed on experiment on fatigue properties machine, and loading equipemtn is placed in outside environmental cabinet.And for example be applicable to the US20090314107A1(environmental mechanical test apparatus of petroleum industry machinery component materials test), this device existing hydraulic closed circuit servo load control system, has again the environmental chamber of controllable temperature and pressure.
In sum, existing Analysis of Concrete Tensile creep test equipment is also undesirable.So be necessary to invent a kind of concrete creep equipment that can meet following requirements: can manipulate epidemic disaster, dynamic, static loading unload, thus realize environmental simulation, a tractor serves several purposes, multiple test specimen synchronism detection.
Summary of the invention
The present invention overcomes the deficiencies in the prior art, and provide a kind of structure simple, experimental enviroment is stablized, and data are accurate, and automaticity is high, for the proving installation of cement-based material tensile creep.
The present invention's adopted technical scheme that solves the problem is: a kind of cement-based material tensile creep test device, and this device comprises: gate-type machine pillar, gate-type load main frame, environmental cabinet, the equipment of casting concrete test specimen and LVDT rectilinear transducer; Described gate-type machine pillar loads main frame with gate-type and is connected, described environmental cabinet and gate-type load main machine centering, warm and humid control system is had in described environmental cabinet, described gate-type loading main frame carries out longitudinal stretching for the equipment of casting concrete test specimen, and LVDT rectilinear transducer carry is on the equipment of casting concrete test specimen.Have leading screw and driver part in described gate-type machine pillar, described gate-type loads in main frame to be had image data and the PC of control system, controls mainboard, servomotor and displacement transducer.All there is perforate top and the bottom of described environmental cabinet, and sidewall has line falling hole for the sensor cabling in case.In described environmental cabinet, temperature range is 0
oc ~ 70
oc, RH range is 40% ~ 90%.Described environmental cabinet is placed on support, support has pulley and track, so that environmental cabinet moves into or shift out gate-type load main frame.The inwall of described environmental cabinet has heat-insulation layer and humiture control system, and this system comprises compression motor, humidifier, heating tube, condenser pipe, fan, Temperature Humidity Sensor and air conditioner motor.Described environmental cabinet is placed between upper grip in framework and lower chuck, all the having perforate up and down and align with chuck of environmental cabinet, and chuck applies axial tension by this perforate to test specimen.The equipment of described casting concrete test specimen is the cylindrical die of upper and lower tandem stack, has web member between two moulds.In the equipment of above-mentioned casting concrete test specimen, test specimen two ends have connecting link to reach outside environmental cabinet from the perforate of environmental cabinet, and the chuck clamping being loaded main frame by gate-type stretches.
Specifically, the cement-based material tensile creep test device of a kind of temperature controllable, humidity comprises environmental cabinet, sliding panel, test stand, charger, rectilinear transducer, servomotor, data acquistion and control system.Combine environmental cabinet and the closed circuit controlled loading system of electro-hydraulic servo.Environmental cabinet is also furnished with slideway and conveniently enters or withdraw master trip machine.Epidemic disaster regulating device is had in environmental cabinet.Environmental cabinet is placed between upper grip in framework and lower chuck.All the having perforate up and down and align with chuck of environmental cabinet.Chuck applies axial tension by this perforate to test specimen.Be embedded with coupling arrangement in test specimen to be connected with chuck.In whole process of the test, test specimen and LVDT(linear displacement transducer) being in one can the epidemic disaster environment of independent operation.The test specimen in parallel that 2 400 mm are long can be put in environmental cabinet.
Environmental cabinet in this device is the curing box of controlled epidemic disaster, and temperature range is 0
oc ~ 70
oc, RH range is within 40% ~ 90%(deviation 3%).All have perforate at the bottom of the top of case, sidewall also has line falling hole for the sensor cabling in case.Gate-type loads main frame and adopts closed-loop control servo loading motor, and peak load 50kN, can hold lotus two weeks.Accessory has: the mould of casting concrete test specimen, test specimen centering, web member.
Accompanying drawing explanation
Fig. 1 is the frame figure that typically creeps in prior art.
Fig. 2 is typical closed-loop control servo loading equipment drawing in prior art.
Fig. 3 is the sketch of apparatus of the present invention.
Fig. 4 is the operating diagram that gate-type of the present invention loads machine host.
Embodiment
Below in conjunction with accompanying drawing, the present invention is described in more detail.
Fig. 3 is the sketch of apparatus of the present invention.Number in the figure is: 1, connecting link; 2, LVDT rectilinear transducer; 3, web member; 4, chuck; 5, environmental cabinet; 6, environmental cabinet track; 7, gate-type machine pillar (inside having leading screw and driver part); 8, gate-type loads main frame (including control mainboard, servomotor); 9, support; 10, gate-type loads the underarm of main frame; 11, the warm and humid control system of environmental cabinet (including compression motor, heating tube, condenser pipe, fan, Temperature Humidity Sensor).Wherein LVDT(Linear Variable Differential Transformer) be the abbreviation of linear variable difference transformer, belong to linear displacement transducer.Principle of work is briefly the movable transformer of iron core.The parts such as it is by a primary coil, two secondary coils, iron core, coil rack, shell form.In the LVDT course of work, motion unshakable in one's determination can not exceed the range of linearity of coil, otherwise will produce non-linear value, and therefore all LVDT all have a range of linearity.
Fig. 4 is that gate-type of the present invention loads the operating diagram of machine host, and the control mainboard that wherein PC machine and gate-type load main frame is communicated with; PC sends instruction (as loaded, unloading, keeps load), controls to be translated into control signal after mainboard receives computer instruction and issues servomotor.Servomotor accurately can control the driver part (Fig. 3, label 7) of leading screw, and leading screw drives gate-type to load rectangular move up (namely in the vertical direction move) of the underarm (Fig. 3, label 10) at leading screw of main frame.The displacement transducer that gate-type loads in main frame records the displacement of underarm and the stress of vertical direction, and by information feed back to control mainboard.Control mainboard process and displacement enlargement and stress information, then feed back to PC.PC sends new instruction, adjustment stress and strain.The control of whole system and information feed back form a closed loop.Gate-type loads main frame can regulable control pattern, displacement control mode and the loading of time course pattern.
Environmental cabinet is placed on support, tries to load main machine centering (Fig. 3) with door.Environmental cabinet support has pulley and track, so that can move in and out gate-type load main frame.Environment tank wall has heat-insulation layer; Regulating temperature and humidity system has compression motor, humidifier, heating tube, condenser pipe, fan, Temperature Humidity Sensor and air conditioner motor.The equipment of casting concrete test specimen is in environmental cabinet, and cylindrical concrete test specimen and external environment separate, and only has the connecting link at test specimen two ends to lead to outside environmental cabinet from the duck eye of environmental cabinet.The chuck that gate-type loads main frame captures connecting link, stretches to test specimen.The custom-designed mould of cylindrical concrete test specimen is built.Connection between test specimen is a rosette (Fig. 3, label 3), and there are perforate and screw thread in centre.Epoxy resin coated by disk, is then screwed to and wants, between bonding two test specimens, to make it to combine as a whole.LVDT rectilinear transducer carry, at the middle part of test specimen, measures the strain of stress distribution homogeneous area.
Claims (7)
1. a cement-based material tensile creep test device, is characterized in that, this device comprises: the equipment of gate-type machine pillar, gate-type loading main frame, environmental cabinet, casting concrete test specimen and LVDT rectilinear transducer; Described gate-type machine pillar loads main frame with gate-type and is connected, described environmental cabinet and gate-type load main machine centering, described environmental cabinet is placed on support, support there are pulley and track, so that environmental cabinet moves into or shifts out gate-type and loads main frame, warm and humid control system is had in described environmental cabinet, in described environmental cabinet, RH range is 40% ~ 90%, described gate-type loading main frame carries out longitudinal stretching for the equipment of casting concrete test specimen, LVDT rectilinear transducer carry, at the middle part of test specimen, measures the strain of stress distribution homogeneous area; Have leading screw and driver part in described gate-type machine pillar, described gate-type loads in main frame to be had image data and the PC of control system, controls mainboard, servomotor and displacement transducer.
2. cement-based material tensile creep test device according to claim 1, it is characterized in that, all there is perforate top and the bottom of described environmental cabinet, and sidewall has line falling hole for the sensor cabling in case.
3. cement-based material tensile creep test device according to claim 1, it is characterized in that, in described environmental cabinet, temperature range is 0 DEG C ~ 70 DEG C.
4. cement-based material tensile creep test device according to claim 1, it is characterized in that, the inwall of described environmental cabinet has heat-insulation layer and humiture control system, and this system comprises compression motor, humidifier, heating tube, condenser pipe, fan, Temperature Humidity Sensor and air conditioner motor.
5. cement-based material tensile creep test device according to claim 1, it is characterized in that, described environmental cabinet is placed between upper grip in framework and lower chuck, all the having perforate up and down and align with chuck of environmental cabinet, and chuck applies axial tension by this perforate to test specimen.
6. cement-based material tensile creep test device according to claim 1, it is characterized in that, the equipment of described casting concrete test specimen is the cylindrical die of upper and lower tandem stack, has web member between two moulds.
7. cement-based material tensile creep test device according to claim 2, it is characterized in that, in the equipment of described casting concrete test specimen, test specimen two ends have connecting link to reach outside environmental cabinet from the perforate of environmental cabinet, and the chuck clamping being loaded main frame by gate-type stretches.
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| CN201210559002.5A CN103063515B (en) | 2012-12-20 | 2012-12-20 | Tensile creep test device for cement-based materials |
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| CN103712855B (en) * | 2013-09-26 | 2016-08-17 | 燕山大学 | A kind of method of testing of concrete creep |
| CN104266923A (en) * | 2014-09-16 | 2015-01-07 | 中国科学院力学研究所 | Gas jet-type erosive-wear testing machine |
| CN105784491A (en) * | 2016-03-10 | 2016-07-20 | 清华大学 | Cement-based material compression creep testing device |
| CN106501497A (en) * | 2016-12-20 | 2017-03-15 | 河海大学 | A kind of experimental rig of axial Complete Bind stress and method |
| CN107748108A (en) * | 2017-10-16 | 2018-03-02 | 河海大学 | It is a kind of to determine experimental rig and the method for testing that Analysis of Concrete Tensile is crept |
| CN109060555B (en) * | 2018-09-03 | 2020-07-21 | 清华大学 | Concrete creep testing device and analysis method based on four-point bending loading |
| CN111707541B (en) * | 2020-06-24 | 2023-06-02 | 扬州大学 | Single-shaft tension loading and testing device for concrete and application method thereof |
| CN112697575A (en) * | 2020-12-24 | 2021-04-23 | 山东三越仪器有限公司 | Support tension-compression creep multifunctional testing machine |
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| WO2010094925A1 (en) * | 2009-02-20 | 2010-08-26 | Halliburton Energy Services, Inc. | In situ testing of mechanical properties of cementitious material |
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| KR20010103232A (en) * | 2000-05-08 | 2001-11-23 | 윤덕용 | Measurement Apparatus for Thermal Stresses of Concrete Structures and Method Thereof |
| US7621186B2 (en) * | 2007-01-31 | 2009-11-24 | Halliburton Energy Services, Inc. | Testing mechanical properties |
| CN201464294U (en) * | 2009-07-20 | 2010-05-12 | 北京工业大学 | Device for measuring axial tensile strength of cement-based materials |
| CN101650283B (en) * | 2009-09-11 | 2011-07-20 | 北京工业大学 | Mould for forming axial tensile-strength test piece of cement-based material and test method |
| CN201852742U (en) * | 2010-06-02 | 2011-06-01 | 江苏大学 | Positioning and loading material testing machine |
| CN102183412B (en) * | 2011-02-18 | 2012-12-12 | 浙江大学 | Tension-shear coupling characteristic tester of asphalt concrete material |
| CN202471524U (en) * | 2012-01-11 | 2012-10-03 | 泰安市路达公路仪器制造有限公司 | Bending creep test device for asphalt mixture |
| CN202522479U (en) * | 2012-03-05 | 2012-11-07 | 山东科技大学 | Novel rock shearing seepage coupling true triaxial test system |
| CN102607966B (en) * | 2012-03-30 | 2014-01-22 | 温州大学 | Large contact surface characteristic direct shear apparatus with cycle loading function |
| CN102798573B (en) * | 2012-08-16 | 2014-10-29 | 浙江大学 | Cryogenic environment material mechanical performance detection test device |
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| WO2010094925A1 (en) * | 2009-02-20 | 2010-08-26 | Halliburton Energy Services, Inc. | In situ testing of mechanical properties of cementitious material |
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