CN202066823U - Measuring device for resistivity change in concrete forming process in high-temperature environment - Google Patents
Measuring device for resistivity change in concrete forming process in high-temperature environment Download PDFInfo
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- CN202066823U CN202066823U CN2011200852770U CN201120085277U CN202066823U CN 202066823 U CN202066823 U CN 202066823U CN 2011200852770 U CN2011200852770 U CN 2011200852770U CN 201120085277 U CN201120085277 U CN 201120085277U CN 202066823 U CN202066823 U CN 202066823U
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Abstract
The utility model discloses a measuring device for resistivity change in a concrete forming process in a high-temperature environment, which comprises a heat supply module, a power module, a resistivity measuring module and a man-machine interface module. The heat supply module consists of a heater, an oil container and a temperature sensor, the power module comprises an oil pumping pipe, an oil delivery pipe and a high-temperature oil pump, the resistivity measuring module is provided with a controller, a voltage sensing ring, a micro-current sensor, a voltage sensor, an oil bath tank and a sample bin, the sample bin is arranged in the oil bath tank, and oil circulation is realized between the oil bath tank and the oil container by the aid of the power module. During application, heat conducting oil with the proper amount is filled into the oil container, the temperature sensor is disposed in the oil bath tank, and oil circulation is started by means of starting the high-temperature oil pump. Heating temperature is preset, the heater is started, when the temperature of the heat conducting oil reaches the preset temperature, newly stirred concrete grout is filled into the sample bin, and then the sample bin is sealed. The resistivity measuring module is started, sampling, recording and analyzing relevant detection values are realized by the aid of the man-machine interface module, and the change curve of resistivity along with time is obtained.
Description
Technical field
The utility model relates to the resistivity measurement technical field, particularly a kind of cement concrete starting material that are mainly used in field of civil engineering such as building, traffic, bridge, water conservancy, underground works are optimized, the match ratio Rational Parameters is selected and the hot environment concrete forming process of concrete Quality Control in the measurement mechanism of change in resistance.
Background technology
Cement concrete is current most important building materials, is widely used in fields such as building, traffic, bridge, water conservancy, underground works.Along with global economy develops rapidly, construction scale is unprecedented, and the cement concrete use amount rises year by year, and is particularly outstanding for the China of rapid economic development.China's cement output in 2010 accounts for 54% of world's cement output up to 18.6 hundred million tons, with the annual production of the concrete of its preparation above 10,000,000,000 tons.Yet because modern concrete component complexity, gel material content is big, and admixture a large amount of industrial residue and additives, easy to crack in early days, cause long-term mechanical strength and permanance to descend.The premature failure of China recent years xoncrete structure happens occasionally, and this has not only caused national wealth to run off in a large number, and has caused the significant wastage of the resource and the energy, has more seriously caused a large amount of casualties.
Like a raging fire in China's fundamental construction at present, investment reaches tens, hundreds of hundred million even the emphasis or the great concrete project construction project of more than one hundred billion Renminbi grow with each passing day, wherein relate to a large amount of prevention of mass concrete engineerings.Hydrated cementitious is emitted a large amount of hydration heat, and concrete is the poor conductor of heat, and a large amount of heats of prevention of mass concrete engineering accumulated inside cause internal temperature higher.The Cement Concrete structure-forming process carries out the speed of speed and the size of degree is directly determining the quantity of hydrated product and the compaction rate of microstructure under hot environment, influence physical and mechanical property, deformational behavior and the long durability energy of cement concrete constructions the most at last, cement concrete constructions forming process under the monitoring hot environment, can be used for monitoring the quality of cement concrete, ensure the long service performance of cement concrete, also can be used to preferred raw material simultaneously, optimize match ratio parameter and scientific guidance construction.It is an effective and feasible method that the method for employing test resistance rate is monitored concrete degree of hydration.Present resistivity method is for passing through Different Water-Cement Ratio, different blending concrete electrical quantitys and response curve Study of variation law, release early-age concrete resistivity and intensity time dependent relation respectively, and correlativity, yet the method only can be studied cement concrete constructions forming process under the room temperature environment, can't realize the structure-forming process research under the hot conditions, therefore, the monitoring device of cement concrete constructions forming process has important project value under the research and development hot environment, for cement concrete quality monitoring provides the experimental apparatus of science, application prospect is very wide.
Summary of the invention
The purpose of this utility model provides the measurement mechanism of change in resistance in a kind of hot environment concrete forming process, and the quick and accurately test of the early stage structure-forming process of cement concrete under the realization hot environment is with the quality behind the assurance concrete formation.
For achieving the above object, the technical scheme that the utility model is taked is: the measurement mechanism of change in resistance in a kind of hot environment concrete forming process, comprise: the heat supply module, it comprises well heater, oil vessel and the temperature sensor of predeterminable temperature, well heater receives the detected temperatures of temperature sensor feedback, and according to preset temperature the oil in the oil vessel is heated;
Power plant module, it comprises petroleum pipeline, oil pick-up tube and high temperature oil pump; Petroleum pipeline one end is communicated with oil vessel, and the other end is communicated with oil bath; Oil pick-up tube connects oil bath, high temperature oil pump, oil vessel successively, by high temperature oil pump the oil in the oil bath is transported in the oil vessel;
The resistivity measurement module, the annular sample bin that it comprises controller, voltage induced ring, low current sensor, voltage sensor, annular oil bath and is arranged in oil bath, sample bin is provided with inlet; The annular distance of voltage induced ring and sample bin interlocks; Low current sensor and voltage sensor be induction current and the induced voltage in the test sample storehouse and deliver in the controller voltage in the controller control voltage induced ring respectively;
Human-machine interface module, it comprises data sampling analysis part and display part, the data sampling analysis part is sampled to the detected value of controller by certain frequency and is analyzed, the analysis result of display part video data sampling analysis part.
As a kind of improvement, the controller of the module of resistivity measurement described in the utility model, its relevant control circuit can utilize existing ripe circuit engineering to realize, the voltage of control voltage induced ring when mainly being included in work, measure the current value of reception low current sensor and the magnitude of voltage and the analytical calculation of voltage sensor and obtain resistivity, and data transfer to human-machine interface module part as computing machine etc. are stored and realize the drafting of resistivity and time-varying relationship curve through correlation analysis software by ripe interface circuit technology of the prior art, correlation analysis software can be by having ripe software engineering realization now.Wherein preferred human-machine interface module is initiatively sampling to the detected value of controller, and sample frequency can will be set by software on-demand.Also can partly be finished by human-machine interface module the calculating of resistivity in addition, promptly sample objects is the detected voltage and current value of controller.
As a kind of improvement, the module of heat supply described in the utility model is the electromagnetic agitation well heater, it places the stirrer of oil vessel when also comprising work, the electromagnetic agitation well heater can adopt matured product of the prior art, it comprises the temperature set-up function, can heat according to design temperature, and whether continue to heat according to the real-time detected value decision of temperature sensor.In addition, well heater also can utilize existing ripe circuit engineering to realize temperature setting, temperature acquisition, contrast.
As a kind of improvement, the power plant module described in the utility model also comprises frequency converter, makes the rotating speed of high temperature oil pump adjustable, regulates rotating speed in testing process as required, to guarantee the oil temperature in the oil bath.
As a kind of improvement, sample bin described in the utility model is that silica gel material is made, and its good insulation preformance is high temperature resistant, has ensured the accuracy of measurement data.
As a kind of improvement, described low current sensor is an annular, the annular distance of itself and sample bin interlocks, concrete, sample bin is a ring tube, and low current sensor is around the pipe periphery of sample bin, and voltage sensor is 1 open traverse, the annular distance that it passes voltage induced ring and low current sensor is parallel to the planar annular setting of sample bin.Because the resistivity measurement module in the utility model is to avoid DC-method to measure the polarization problem of concrete resistivity, adopted the induction mode of electrodeless contact to measure, because there is not electrode, just need utilize the form of transformer to produce an induced voltage with electromagnetic induction, simulated a transformer in the utility model, it is elementary that wherein the voltage induced ring is equivalent to the former limit of transformer, it is secondary that sample bin is equivalent to the secondary of transformer, when the former limit of transformer adds an alternating voltage (frequency that adopts in the utility model is the 1KHz sinusoidal signal), inferior limit will induce a loop voltag V, and this voltage makes sample bin produce a ring current I.The utility model passes through the same path but inc lead with one with sample, promptly be parallel to each other with the sample bin planar annular, and the same voltage sensor of walking around the voltage induced ring with sample bin, measure the voltage (V) that induces on the sample, test circular current (I) by sample with a low current sensor.Inorganic coagulation material (as cement concrete, geopolymer etc.) generally shows the feature of inductance in the voltage effect that exchanges, and promptly induces to have a phase differential between voltage and the electric current
, therefore can equivalence become a resistance in parallel with an inductance.Can calculate the resistance of sample according to Ohm law.
In the formula, the resistance of R-sample, the loop voltag of V-induction, the circular current of I-induction,
-loop voltag ring and current and phase difference.
Because the a-c cycle that uses is lower, only 1KHz can ignore the influence of sample inductance fully.Simultaneously, when adding electric field on the sample, connect on polar molecule in the sample and the atom head and the tail, cancel each other, so polarization field is extremely faint.Theoretically, for this electrodeless ring sample, just no longer there is the electric charge accumulation owing to the electric charge accumulation produces in polarized electric field.Although not talkative polarization field exists anything but, in measurement, can ignore fully.And the experiment also proved this point, promptly the phase place of voltage V and electric current I is just the same.If there is polarization field to exist, be relevant capacity effect with reacting, certainly exist phase differential between voltage and the electric current.
Based on above-mentioned analysis as can be known, loop voltag ring and current and phase difference can be approximated to be 0, and (1) formula can turn to so:
Promptly obtain concrete resistivity of corresponding time under the respective environment, the later stage can obtain the relation curve of resistivity and time variation easily by software analysis.
Device of the present utility model its measuring method when measuring may further comprise the steps:
1) height that filling heat-conductive oil in oil vessel, conduction oil are arranged in oil vessel is higher than the junction height of oil vessel and petroleum pipeline; Temperature sensor is inserted in the oil bath, start high temperature oil pump, make between oil vessel and the oil bath and form the oil circulation by petroleum pipeline and oil pick-up tube;
2) default heter temperature value starts well heater the conduction oil in the oil vessel is heated, and temperature sensor is monitored the conduction oil temperature in the oil bath in real time and detected value fed back to well heater;
3) when the conduction oil temperature is heated to preset temperature; Inject fresh concrete from inlet to sample bin, after injection finishes inlet is sealed;
4) starting resistance rate measurement module, the voltage of control voltage induced ring, and to the detected value of low current sensor and voltage sensor; Starting human-machine interface module simultaneously samples to the detected value of controller by certain frequency and analyzes display part display analysis result.
As a kind of improvement, the rotor speed of high temperature oil pump is regulated in 0-1500 rev/min of scope in the step 1), makes the circulation of oil more steady when guaranteeing the transmission speed of temperature in oil vessel and the oil bath, the minimizing thermal loss.
As preferred embodiment a kind of, the preset temperature of well heater described in the step 3) is regulated in 20-350 ℃ of scope.Both having satisfied the detected temperatures requirement can the too high influence that causes sample bin to resistivity of Yin Wendu yet.
The beneficial effects of the utility model are: integrated use electromagnetic induction technology, employing high temperature oil pump are by realizing real in the metastable oil bath heating of testing sample to carrying out the round-robin mode after the conduction oil external heating, in whole observation process, detecting instrument and sample need not to move the resistance parameter that gets final product in continuous acquisition and the automatic record cement concrete paste structure forming process, later stage very easily obtains change curve by the related software analysis, realized cement concrete self-watering under the hot environment begin to structure form in the overall process continuously, automatically, in-situ monitoring; In addition, the hot environment structure that comprises oil bath and sample bin of the utility model simulation makes it applicable to all temps change in resistance rule detection down on a large scale.
Description of drawings
Figure 1 shows that device synoptic diagram of the present utility model, wherein: 1-well heater, 11-oil vessel, the 12-temperature sensor, 2-resistivity detection module, 21-voltage induced ring, the 22-oil bath, 23-sample bin, 231-inlet, the 24-voltage sensor, 25-low current sensor, 3-high temperature oil pump, the 31-frequency converter, the 32-oil pick-up tube, 33-petroleum pipeline, 4-computing machine;
Figure 2 shows that resistivity measurement modular structure synoptic diagram in the utility model;
Figure 3 shows that the testing result curve of the application examples 1 that adopts the utility model device;
Figure 4 shows that the testing result curve of the application examples 2 that adopts the utility model device;
Figure 5 shows that the testing result curve of the application examples 3 that adopts the utility model device.
Embodiment
The utility model is described in further detail below in conjunction with the drawings and specific embodiments:
In conjunction with Fig. 1 to Figure 2 shows that hot environment cement concrete forming process change in resistance measurement mechanism of the present utility model, wherein, the heat supply module adopts the electromagnetic agitation well heater of prior art, it places stirrer, temperature sensor and the temperature setting module of oil vessel when comprising oil vessel, work, to well heater, well heater heats the oil in the oil vessel according to design temperature temperature sensor with detected Temperature Feedback; Petroleum pipeline one end is communicated with oil vessel, and the other end is communicated with oil bath; Oil pick-up tube connects oil bath, high temperature oil pump, oil vessel successively, by high temperature oil pump the oil in the oil bath is transported in the oil vessel, and high temperature oil pump comprises that also frequency converter makes its rotating speed adjustable; The resistivity measurement module comprises controller, voltage induced ring, low current sensor, voltage sensor, annular oil bath and annular sample bin, and sample bin places oil bath, which is provided with inlet; The voltage induced ring is a Q-RING, and the annular distance of itself and oil bath and sample bin interlocks; Voltage sensor is an open traverse, and it is parallel to the setting of sample bin planar annular, and passes the annular distance of voltage induced ring and little current inductor; Sample bin is annular tube shaped, and low current sensor is the pipe periphery that square ring-type is trapped among sample bin, the voltage in the controller control voltage induced ring, and low current sensor and voltage sensor are sent into detected value in the controller; Human-machine interface module, it comprises data sampling analysis part and display part, the data sampling analysis part is sampled, is write down and analyze the detected value of controller by certain frequency, the analysis result of display part video data sampling analysis part.
The controller of resistivity measurement module, its relevant control circuit can utilize existing ripe circuit engineering to realize, it can be realized by ripe interface circuit technology of the prior art with being connected of human-machine interface module, initiatively controller is sampled and recording storage according to certain frequency by the human-machine interface module part, sample frequency can be passed through software setting, and related software can utilize the ripe software engineering of prior art to realize.
Be respectively the resistivity testing result of the concrete application examples of utilizing three different proportionings that apparatus and method of the present utility model carry out in conjunction with Fig. 3 to Fig. 5, wherein:
Adopt P.II52.5 portland cement, the high-efficiency water-reducing agent of poly-carboxylic acid of solid content 30%, tap water in the application examples 1.Proportioning is: 1300g cement, 215g water, 32.5g additive.
Adopt P.II52.5 portland cement, the high-efficiency water-reducing agent of poly-carboxylic acid of solid content 30%, tap water in the application examples 2.Proportioning is: 1300g cement, 208g water, 32.5g additive.
Adopt P.II52.5 portland cement, the high-efficiency water-reducing agent of poly-carboxylic acid of solid content 30%, tap water in the application examples 3.Proportioning is: 1300g cement, 208g water, 36g additive.
Carry out according to following steps respectively:
1) height that filling heat-conductive oil in oil vessel, conduction oil are arranged in oil vessel is higher than the junction height of oil vessel and petroleum pipeline; Temperature sensor is inserted in the oil bath, start high temperature oil pump, make between oil vessel and the oil bath and form the oil circulation by petroleum pipeline and oil pick-up tube;
2) default heter temperature value starts well heater the conduction oil in the oil vessel is heated, and temperature sensor is monitored the conduction oil temperature in the oil bath in real time and detected value fed back to well heater;
3) when the conduction oil temperature is heated to preset temperature; Inject fresh concrete from inlet to sample bin, after injection finishes inlet is sealed;
4) starting resistance rate measurement module, the voltage of control voltage induced ring, and to the detected value of low current sensor and voltage sensor; Starting human-machine interface module simultaneously samples to the detected value of controller by certain frequency and analyzes display part display analysis result.
By ripe interfacing of the prior art the real-time detected resistivity of controller is transferred to computing machine, and analyze the time dependent curve of resistivity by related software, application examples 1 to 3 obtains the respective detection result of Fig. 3 to Fig. 5 respectively.
Above application examples is by being provided with the little differential testing result that obtains significant difference of single factors, contrast the resulting result of method of the prior art, fact proved it when having pinpoint accuracy, also have very high sensitivity, be adapted at wideling popularize in the association area.
Concrete case study on implementation only is a preferable case study on implementation of the present utility model described in the utility model, is not to be used for limiting practical range of the present utility model.Be that all equivalences of doing according to the content of the utility model claim change and modification, all should be as technology category of the present utility model.
Claims (6)
1. the measurement mechanism of change in resistance in the hot environment concrete forming process is characterized in that, comprising:
The heat supply module, it comprises well heater, oil vessel and the temperature sensor of predeterminable temperature, well heater receives the detected temperatures of temperature sensor feedback, and according to preset temperature the oil in the oil vessel is heated;
Power plant module, it comprises petroleum pipeline, oil pick-up tube and high temperature oil pump; Petroleum pipeline one end is communicated with oil vessel, and the other end is communicated with oil bath; Oil pick-up tube connects oil bath, high temperature oil pump, oil vessel successively, by high temperature oil pump the oil in the oil bath is transported in the oil vessel;
The resistivity measurement module, the annular sample bin that it comprises controller, voltage induced ring, low current sensor, voltage sensor, annular oil bath and is arranged in oil bath, sample bin is provided with inlet; The annular distance of voltage induced ring and sample bin interlocks; Low current sensor and voltage sensor be induction current and the induced voltage in the test sample storehouse and deliver in the controller voltage in the controller control voltage induced ring respectively;
Human-machine interface module, it comprises data sampling analysis part and display part, the data sampling analysis part is sampled to the detected value of controller by certain frequency and is analyzed, the analysis result of display part video data sampling analysis part.
2. the measurement mechanism of change in resistance is characterized in that in the hot environment concrete forming process according to claim 1, and described heat supply module is the electromagnetic agitation well heater, and it places the stirrer of oil vessel when also comprising work.
3. the measurement mechanism of change in resistance is characterized in that described power plant module also comprises frequency converter in the hot environment concrete forming process according to claim 1, regulates the rotating speed that frequency converter can change high temperature oil pump.
4. according to the measurement mechanism of change in resistance in claim 1 or the 2 or 3 described hot environment concrete forming processes, it is characterized in that described sample bin is that silica gel material is made.
5. according to the measurement mechanism of change in resistance in claim 1 or the 2 or 3 described hot environment concrete forming processes, it is characterized in that described low current sensor is an annular, the annular distance of its annular distance and sample bin interlocks.
6. the measurement mechanism of change in resistance is characterized in that in the hot environment concrete forming process according to claim 5, and described voltage sensor is 1 open traverse, and it passes the annular distance of voltage induced ring and little current inductor.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2011200852770U CN202066823U (en) | 2011-03-28 | 2011-03-28 | Measuring device for resistivity change in concrete forming process in high-temperature environment |
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| CN2011200852770U CN202066823U (en) | 2011-03-28 | 2011-03-28 | Measuring device for resistivity change in concrete forming process in high-temperature environment |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102226824A (en) * | 2011-03-28 | 2011-10-26 | 东南大学 | Apparatus and method for measuring resistivity changes during concrete forming process in high temperature environment |
| CN104749350A (en) * | 2015-03-20 | 2015-07-01 | 中国矿业大学(北京) | Testing machine for monitoring heat-electricity-flow-force coupling behavior in cement-based material solidification process |
-
2011
- 2011-03-28 CN CN2011200852770U patent/CN202066823U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102226824A (en) * | 2011-03-28 | 2011-10-26 | 东南大学 | Apparatus and method for measuring resistivity changes during concrete forming process in high temperature environment |
| CN104749350A (en) * | 2015-03-20 | 2015-07-01 | 中国矿业大学(北京) | Testing machine for monitoring heat-electricity-flow-force coupling behavior in cement-based material solidification process |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
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| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20111207 Termination date: 20130328 |