CN108107193A - A kind of test device and method of fresh concrete education resistance energy - Google Patents
A kind of test device and method of fresh concrete education resistance energy Download PDFInfo
- Publication number
- CN108107193A CN108107193A CN201711351487.8A CN201711351487A CN108107193A CN 108107193 A CN108107193 A CN 108107193A CN 201711351487 A CN201711351487 A CN 201711351487A CN 108107193 A CN108107193 A CN 108107193A
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- Prior art keywords
- concrete
- electrode plate
- side wall
- fresh concrete
- resistance
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
- G01N33/38—Concrete; ceramics; glass; bricks
- G01N33/383—Concrete, cement
Abstract
The present invention relates to fresh concrete overall stability and uniformity test field, more particularly to the test device and method of a kind of fresh concrete education resistance energy, it is to solve existing fresh concrete stability and homogeneity testing method, concrete structure bearing capacity may be seriously affected, and low precision, test environment conditions are required with the shortcomings that harsh and is proposed, including：Four side walls, a head cover and a bottom plate, are wherein provided at least one electrode plate at the preset height of the inside of the first side wall, and the electrode plate of identical size is provided at the identical height of the second sidewall opposite with the first side wall；One end of conducting wire is connected with electrode plate, non-moving end of the other end as double-pole multithrow switch；The conducting wire that mutually level electrode plate is drawn on side wall corresponds to non-moving end being capable of Partner simultaneous selection；The moved end of double-pole multithrow switch is electrically connected with resistance meter.The present invention, which is suitable for fresh concrete education resistance, to be tested.
Description
Technical field
The present invention relates to fresh concrete overall stability and uniformity test field, and in particular to a kind of fresh concrete
The test device and method of education resistance energy.
Background technology
With the rapid development of modern economy and science and technology, all kinds of construction styles continue to bring out, and high-rise, high-rise building is increasingly
Increase.Concrete is as one of most widely used civil engineering material, to meet each construction ring of various modern architectures
The needs of section must possess better workability in the case where newly mixing state.The workability of fresh concrete generally comprises mobility, glues
Poly- property and water-retaining property.In the construction process often in order to meet the large fluidity of fresh concrete, and ignore its cohesiveness, occur
The phenomenon that concrete disintegration.Concrete disintegration is caused by due to the cohesive strength deficiency between concrete each component, is usually showed
It is separated from each other between two component of coarse aggregate and mortar.The coarse aggregate of greater particle size sinks under dead weight or vibration condition, causes
Upper layer concrete is different from the coarse aggregate volume fraction that lower-layer concrete is included.Isolation can not only influence the homogeneous of concrete
Property, pumping, can also be such that concrete strength significantly declines, seriously affect the bearing capacity of concrete structure, reduce structure
Security performance.At present, unified standard, difference are ground not yet for the test to fresh concrete education resistance energy both at home and abroad and evaluation
The method that the person of studying carefully uses respectively has advantage and disadvantage.Such as：Method is sieved and washed using aggregate Stratified Sampling, experimental work amount is big, test result by
Experimental implementation person influences big and precision is poor；Using gamma-rays method measure coarse aggregate distribution whether uniform method, test process
Cumbersome, laboratory apparatus is more demanding, and test environment conditions requirement is harsh, it is difficult on a large scale applied to Practical Project and laboratory
Quick test.
The content of the invention
It, may be serious the purpose of the present invention is to solve existing fresh concrete stability and homogeneity testing method
It influences concrete structure bearing capacity, and low precision, test environment conditions is required with the shortcomings that harsh, and it is mixed to propose that one kind is newly mixed
The test device and method of solidifying soil education resistance energy.
The present invention provides a kind of test device and method of fresh concrete education resistance energy, including：
Four side walls, a head cover and a bottom plate, are wherein provided at least at the preset height of the inside of the first side wall
One electrode plate is provided with the electrode plate of identical size at the identical height of the second sidewall opposite with the first side wall；Together
Spacing between each electrode plate of one side wall is identical, is isolated between each electrode plate using insulating materials；The first side wall and second
The hole for extraction wire is additionally provided on side wall, one end of conducting wire is connected with electrode plate, and the other end is thrown out more as double-pole
The non-moving end of pass；The first side wall non-moving end corresponding with the conducting wire that mutually level electrode plate is drawn in second sidewall being capable of Partner
Simultaneous selection；The moved end of double-pole multithrow switch is electrically connected with resistance meter.
The present invention also provides a kind of test methods of fresh concrete education resistance energy, and the method is based on foregoing dress
Realization is put, the described method includes：
Step 1: the head cover of device for opening, it will be in fresh concrete sample charging apparatus to be measured.
Step 2: closing head cover, DC current source switch is opened.
Step 3: double-pole multithrow switch is connected any one in all non-moving ends, resistance test set test is pressed
Button records resistance value R in display screeni, and press stop button.
Step 4: repeating step 3, the resistance value on resistance test set display screen when connecting each non-moving end is obtained.
Step 5: calculate the resistivity of different height region concreteS is that the concrete that electric current passes through is cut
Face area；L is the distance between parallel electrode plate.
Step 6: resistivity contrasts degree SI is calculated according to equation below：
Wherein ρ1Represent the resistivity of topmost region concrete to be measured；ρnRepresent the electricity of lowest part region concrete to be measured
Resistance rate；Represent the arithmetic mean of instantaneous value of the resistivity of all region concrete to be measured；Resistivity contrasts degree SI for characterize resist from
Analysis degree, the value of SI is bigger, shows that the isolation degree of concrete is bigger, education resistance can be poorer；The value of SI is smaller, shows
For the isolation degree of concrete with regard to smaller, education resistance can be better.
Beneficial effects of the present invention are：Test device and side using the present invention for fresh concrete education resistance energy
Method, can it is convenient and accurately measure different mixture ratio fresh concrete under static condition coarse aggregate infall process and resist from
Analyse performance.In the test process mensuration region of concrete to be measured can arbitrarily set, the sensitivity tested can be according to known
The resistance value of measuring resistance is adjusted, and is tested available for experimental study and Practical Project.The test device operation principle is simple,
Simple operation, measuring accuracy are high, applied widely, can reduce the operating time at least 10%, can improve measuring accuracy at least
5%.
Description of the drawings
Fig. 1 is the structure chart of the test device of the fresh concrete education resistance energy of the present invention.In figure：1st, DC current
Source；2nd, resistance test set；3rd, double-pole multithrow switch K；4th, container；5th, head cover；6th, electrode plate；7th, circular hole；8th, conducting wire；9th, bottom
Plate；10th, stripper；11st, stripper handle；12nd, fixing bracket.
Specific embodiment
Specific embodiment one：
Present embodiment provides a kind of test device of fresh concrete education resistance energy, as shown in Figure 1, including：
Four side walls, a head cover 5 and a bottom plate 9 and its cavity volume surrounded, for containing to be measured new mix in container 4
Concrete sample.At least one electrode plate 6 is wherein provided at the preset height of the inside of the first side wall, with the first side wall
The electrode plate 6 of identical size is provided at the identical height of opposite second sidewall；Between between each electrode plate 6 of same side wall
Away from identical, isolated between each electrode plate 6 using insulating materials；It is additionally provided on the first side wall and second sidewall and is led for drawing
The hole 7 of line 8, one end of conducting wire are connected with electrode plate 6, non-moving end of the other end as double-pole multithrow switch 3；Conducting wire can 8
Side wall is arranged outside.The first side wall can with the 8 corresponding non-moving end of conducting wire that mutually level electrode plate 6 is drawn in second sidewall
Partner simultaneous selection；The moved end of double-pole multithrow switch 3 is connected with resistance test set 2.
Discharge is provided on bottom plate 9, can be drawing and pulling type stripper 10, for being loaded into the cavity volume that side wall and bottom plate surround
Interior substance removes.Bottom plate lower part is connected with metal mounting bracket 12.Test device is further included as the straight of resistance meter power supply
Flow current source 1.DC current source 1 containing way circuit switch, output voltage excursion be 0~30V, output current excursion
For 0~5A；Resistance test set 2 contains display screen and test/stop button, and the concrete ohmic resistance at different height can be by electricity
Resistance test instrumentation 2 is directly read.
From figure 1 it appears that the inside for having one group of opposite side wall in four side walls is provided with electrode plate 6, and set
It is corresponding one group to put in different lateral, mutually level electrode plate, this group is used for testing the electricity of this region concrete
Resistance rate.The decisions such as total amount, the height of side wall that how many groups of electrode plates can be according to concrete are specifically set, as long as can fully measure
All concrete in cavity volume.
Specific embodiment two,
Present embodiment includes a kind of test method of fresh concrete education resistance energy, and this method is based on Fig. 1 institutes
What the test device of the fresh concrete education resistance energy shown was realized, method specifically includes：
Step 1: the head cover of device for opening, it will be in fresh concrete sample charging apparatus to be measured；In concrete vibrating stand
Or fresh concrete sample is ensured under the effect of vibration of vibrating spear each area filling is closely knit in a reservoir, and upper surface is smooth.
Step 2: closing head cover, DC current source switch is opened.
Step 3: double-pole multithrow switch is connected any one in all non-moving ends, resistance test set test is pressed
Button records resistance value R in display screeni, and press stop button；Subscript i can be understood as i-th of non-moving end being to turn on survey
The numerical value obtained or the corresponding numerical value of i-th group of height.The meaning of i-th group of height can be shown in Fig. 1, and same height is total in Fig. 1
There are two and for opposite electrode plates, the two electrode plate nominals are one group, because the two electrode plates are clipped in for measuring
The numerical value of this part concrete between two electrode plates.
Step 4: repeating step 3, the resistance value on resistance test set display screen when connecting each non-moving end is obtained.
Step 5: calculate the resistivity of different height region concreteρiUnit be Ω m；S is electricity
Flow through concrete section area, unit m2；L is the distance between for parallel electrode plate, unit m.
Step 6: the education resistance of concrete can be commented using the resistivity contrasts degree SI at concrete different height position
Valency.Resistivity contrasts degree SI is calculated according to equation below：
Wherein ρ1Represent the resistivity of topmost region concrete to be measured；ρnRepresent the electricity of lowest part region concrete to be measured
Resistance rate；Represent the arithmetic mean of instantaneous value of the resistivity of all region concrete to be measured.Resistivity contrasts degree SI for characterize resist from
Analysis degree, the value of SI is bigger, shows that the isolation degree of concrete is bigger, education resistance can be poorer；The value of SI is smaller, shows
For the isolation degree of concrete with regard to smaller, education resistance can be better.
Present embodiment can also include the judgment step of coarse aggregate sedimentation degree, be specially：
Step 7: the static predetermined time, repeats step 6, judges coarse aggregate according to the resistivity contrasts degree measured
Sedimentation degree.
The present invention can also have other various embodiments, without deviating from the spirit and substance of the present invention, this field
Technical staff makes various corresponding changes and deformation in accordance with the present invention, but these corresponding changes and deformation should all belong to
The protection domain of appended claims of the invention.
Claims (5)
1. a kind of test device of fresh concrete education resistance energy, which is characterized in that including：
Four side walls, a head cover and a bottom plate are wherein provided at least one at the preset height of the inside of the first side wall
Electrode plate is provided with the electrode plate of identical size at the identical height of the second sidewall opposite with the first side wall；It is same
Spacing between each electrode plate of side wall is identical, is isolated between each electrode plate using insulating materials；The first side wall and second sidewall
On be additionally provided with hole for extraction wire, one end of conducting wire is connected with electrode plate, and the other end is as double-pole multithrow switch
Non-moving end；The first side wall non-moving end corresponding with the conducting wire that mutually level electrode plate in second sidewall is drawn can Partner simultaneously
Selection；The moved end of double-pole multithrow switch is connected with resistance test set.
2. the test device of fresh concrete education resistance energy according to claim 1, which is characterized in that on the bottom plate
Discharge is provided with, the substance for being loaded into the cavity volume that side wall and bottom plate surround removes.
3. the test device of fresh concrete education resistance energy according to claim 1, which is characterized in that further include as electricity
Hinder the DC current source of tester power supply.
4. a kind of test method of fresh concrete education resistance energy, the method is based on as any one in claims 1 to 3
What the device of item was realized, the described method includes：
Step 1: the head cover of device for opening, it will be in fresh concrete sample charging apparatus to be measured；
Step 2: closing head cover, DC current source switch is opened；
Step 3: double-pole multithrow switch is connected any one in all non-moving ends, resistance test set testing button is pressed,
Record resistance value R in display screeni, and press stop button；
Step 4: repeating step 3, the resistance value on resistance test set display screen when connecting each non-moving end is obtained；
Step 5: calculate the electricalresistivityρ of different height region concretei：S is the concrete section face that electric current passes through
Product；L is the distance between parallel electrode plate；
Step 6: resistivity contrasts degree SI is calculated according to equation below：
<mrow>
<mi>S</mi>
<mi>I</mi>
<mo>=</mo>
<mfrac>
<mrow>
<msub>
<mi>&rho;</mi>
<mi>n</mi>
</msub>
<mo>-</mo>
<msub>
<mi>&rho;</mi>
<mn>1</mn>
</msub>
</mrow>
<mover>
<mi>&rho;</mi>
<mo>&OverBar;</mo>
</mover>
</mfrac>
<mo>&times;</mo>
<mn>100</mn>
<mi>%</mi>
</mrow>
Wherein ρ1Represent the resistivity of topmost region concrete to be measured；ρnRepresent the resistivity of lowest part region concrete to be measured；Represent the arithmetic mean of instantaneous value of the resistivity of all region concrete to be measured；
For resistivity contrasts degree SI for characterizing anti-isolation degree, the value of SI is bigger, shows that the isolation degree of concrete is bigger,
Education resistance can be poorer；The value of SI is smaller, shows the isolation degree of concrete with regard to smaller, education resistance can be better.
5. it according to the method described in claim 4, it is characterized in that, further includes：
Step 7: the static predetermined time, repeats step 6, the sedimentation of coarse aggregate is judged according to the resistivity contrasts degree measured
Degree.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711351487.8A CN108107193A (en) | 2017-12-15 | 2017-12-15 | A kind of test device and method of fresh concrete education resistance energy |
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|---|---|---|---|
| CN201711351487.8A CN108107193A (en) | 2017-12-15 | 2017-12-15 | A kind of test device and method of fresh concrete education resistance energy |
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| Publication Number | Publication Date |
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| CN108107193A true CN108107193A (en) | 2018-06-01 |
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ID=62217443
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| CN201711351487.8A Pending CN108107193A (en) | 2017-12-15 | 2017-12-15 | A kind of test device and method of fresh concrete education resistance energy |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111537566A (en) * | 2020-04-17 | 2020-08-14 | 中天华南建设投资集团有限公司 | Concrete forming construction method based on concrete segregation degree testing device |
| CN114199723A (en) * | 2021-12-21 | 2022-03-18 | 哈尔滨工业大学 | Rheological property testing device under vibration action of fresh concrete and using method thereof |
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| JPS63165756A (en) * | 1986-12-26 | 1988-07-09 | Kokudo Kaihatsu Gijutsu Kenkyu Center | Method and apparatus for measuring vc value of concrete |
| CA2322931A1 (en) * | 2000-10-11 | 2002-04-11 | Pavate V. Trimbak | Multi-probe conductivity method for monitoring time-dependent processes in fresh cementitious and other dense slurry systems |
| CN1566544A (en) * | 2003-06-16 | 2005-01-19 | 陈彦平 | Method for monitoring pile foundation construction quality and reinforcing pile foundation by electric exploring method |
| CN1837515A (en) * | 2005-03-21 | 2006-09-27 | 陈彦平 | Technologic method for detecting construction quality of pile foundation by electricity detection method |
| CN1837802A (en) * | 2005-03-21 | 2006-09-27 | 陈彦平 | Electrical resistivity survey method for monitoring construction quality of reinforce concrete and prestressed concrete |
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| CN104865156A (en) * | 2015-05-15 | 2015-08-26 | 长安大学 | Device and method for evaluating segregation degree of cement concrete |
| CN206638621U (en) * | 2017-03-20 | 2017-11-14 | 三峡大学 | A kind of experimental rig for real-time testing concrete resistivity |
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Patent Citations (9)
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|---|---|---|---|---|
| JPS63165756A (en) * | 1986-12-26 | 1988-07-09 | Kokudo Kaihatsu Gijutsu Kenkyu Center | Method and apparatus for measuring vc value of concrete |
| CA2322931A1 (en) * | 2000-10-11 | 2002-04-11 | Pavate V. Trimbak | Multi-probe conductivity method for monitoring time-dependent processes in fresh cementitious and other dense slurry systems |
| CN1566544A (en) * | 2003-06-16 | 2005-01-19 | 陈彦平 | Method for monitoring pile foundation construction quality and reinforcing pile foundation by electric exploring method |
| CN1837515A (en) * | 2005-03-21 | 2006-09-27 | 陈彦平 | Technologic method for detecting construction quality of pile foundation by electricity detection method |
| CN1837802A (en) * | 2005-03-21 | 2006-09-27 | 陈彦平 | Electrical resistivity survey method for monitoring construction quality of reinforce concrete and prestressed concrete |
| CN102269725A (en) * | 2011-05-10 | 2011-12-07 | 交通运输部公路科学研究所 | Device and method for testing concrete pouring uniformity and compactness |
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| CN104865156A (en) * | 2015-05-15 | 2015-08-26 | 长安大学 | Device and method for evaluating segregation degree of cement concrete |
| CN206638621U (en) * | 2017-03-20 | 2017-11-14 | 三峡大学 | A kind of experimental rig for real-time testing concrete resistivity |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111537566A (en) * | 2020-04-17 | 2020-08-14 | 中天华南建设投资集团有限公司 | Concrete forming construction method based on concrete segregation degree testing device |
| CN114199723A (en) * | 2021-12-21 | 2022-03-18 | 哈尔滨工业大学 | Rheological property testing device under vibration action of fresh concrete and using method thereof |
| CN114199723B (en) * | 2021-12-21 | 2023-11-17 | 哈尔滨工业大学 | Rheological property testing device under vibration action of fresh concrete and application method thereof |
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Application publication date: 20180601 |
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