CN108709979A - A kind of testing equipment and method for evaluating product concrete formability energy - Google Patents
A kind of testing equipment and method for evaluating product concrete formability energy Download PDFInfo
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- CN108709979A CN108709979A CN201810518547.9A CN201810518547A CN108709979A CN 108709979 A CN108709979 A CN 108709979A CN 201810518547 A CN201810518547 A CN 201810518547A CN 108709979 A CN108709979 A CN 108709979A
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- 238000012360 testing method Methods 0.000 title claims abstract description 27
- 238000000034 method Methods 0.000 title claims abstract description 21
- 238000000465 moulding Methods 0.000 claims abstract description 13
- 238000011156 evaluation Methods 0.000 claims abstract description 12
- 230000000740 bleeding effect Effects 0.000 claims abstract description 8
- 238000006243 chemical reaction Methods 0.000 claims description 11
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 6
- 230000015572 biosynthetic process Effects 0.000 claims description 5
- 239000000203 mixture Substances 0.000 claims description 5
- 230000003746 surface roughness Effects 0.000 claims description 2
- 238000007790 scraping Methods 0.000 claims 1
- 239000000725 suspension Substances 0.000 claims 1
- 238000005259 measurement Methods 0.000 abstract description 4
- 241001669679 Eleotris Species 0.000 description 5
- 238000010586 diagram Methods 0.000 description 5
- 230000015271 coagulation Effects 0.000 description 4
- 238000005345 coagulation Methods 0.000 description 4
- 239000002689 soil Substances 0.000 description 4
- 201000001376 Familial Combined Hyperlipidemia Diseases 0.000 description 3
- 238000002474 experimental method Methods 0.000 description 3
- 239000000463 material Substances 0.000 description 3
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- 206010044565 Tremor Diseases 0.000 description 1
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- 239000004568 cement Substances 0.000 description 1
- 238000005056 compaction Methods 0.000 description 1
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- 238000010348 incorporation Methods 0.000 description 1
- 229910052500 inorganic mineral Inorganic materials 0.000 description 1
- 230000001788 irregular Effects 0.000 description 1
- 239000011707 mineral Substances 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 238000011056 performance test Methods 0.000 description 1
- 239000004576 sand Substances 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
- 239000004575 stone Substances 0.000 description 1
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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; Lime; Mortar; Gypsum; Bricks; Ceramics; Glass
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Abstract
The present invention provides a kind of testing equipments and method for evaluating product concrete formability energy, the concrete of the known slump will specifically be stirred, it is fitted into the slump cone being placed in the middle part of special charge cask, then special charge cask is fixed on the vibration table of variant-frequency vibration equipment, lift slump cone, opening vibration control switch makes table top be vibrated under the frequency of setting, observe the deformability and deformation velocity of concrete, record is vibrated since table top up to concrete filling expires special charge cask, and the time of vibration used in concrete surface whole bleeding, use unified physical quantity i.e. using the height of charge cask and diameter ratio be multiplied by vibration frequency again divided by the evaluation of time of vibration as product concrete plastic index, to characterize the formability energy of product concrete；The present invention has the characteristics that applicability is wide, easy to operate, high certainty of measurement, can be used for evaluating the molding of different product concrete and closely knit complexity.
Description
Technical field
The invention belongs to working performance of concrete technical field of measurement and test, and in particular to one kind can for evaluating product concrete
The detection device and test method of processability.
Background technology
Concrete batching system is by materials such as cement, mineral admixture, sand, stone, water and additives through being mixed
Made of gas-liquid-solid heterogeneous material, each component grain thickness is irregular, and the mobile performance of each component is different, for weigh coagulation
The working performance of native mix evaluates its formability energy, other than the widely used slump consistancy test in current countries in the world, people
It also proposed closely knit factorial experiments, remolding test, the vigorous flow test of dimension, increase the test methods such as real factorial experiments, although these sides
Method achieves certain success in terms of quantitative determination, but it can only be determined a certain single characteristic of normal concrete workability
The workability of concrete is only simply contacted with the physical quantity foundation measured, can not effectively be reflected mixed by the measurement of amount
Coagulate the complexity of the formability energy of soil.
Wide in variety, covering scope is wide due to being related to for product concrete, including dry, half dry, inductile, plasticity,
The concrete of the different operatings such as fluidised form, big fluidised form is often borrowed to enable product concrete batching system to flow to be full of die cavity
Help vibratory compaction moulding process to overcome the shear stress of concrete batching system so that solid particle is constantly made by impact force
With and cause to tremble, allow the part or all of liquidization and flow of product concrete batching system, to realize concrete batching system it is closely knit at
Type.Currently, the evaluation method for product working performance of concrete falls behind relatively, there are no unified methods by different systems so far
Product working performance of concrete is characterized with a scientific and reasonable magnitude.It is vigorous using generally use dimension for dry concrete
Flow test increases real factorial experiments to characterize the working performance of concrete, due to test operation is cumbersome, to operating personnel require compared with
It is high, hence it is evident that restrict field popularization application；And slump consistancy test is also used for non-dry coagulation is most of, pass through concrete
It collapses naturally under static state and highly characterizes the working performance of concrete, cannot really reflect comprehensively under vibration condition and mix
Coagulate soil working characteristics and formability energy, therefore, how incorporation engineering actual conditions, establish scientific and reasonable test method,
The formability energy of effective evaluation difference product concrete, is current urgent problem to be solved.
Invention content
Present invention is generally directed to insufficient existing for existing product concrete formability energy detection technique, invention is a kind of to be applicable in
Property it is wide, easily to operate, high certainty of measurement, can be used for evaluating product concrete formability can testing equipment and method.
The present invention realizes above-mentioned purpose by using following technical scheme：
A kind of testing equipment and method for evaluating product concrete formability energy, which is characterized in that it includes following step
Suddenly：（1）Slump cone and special charge cask are moistened, and ensures slump cone inner wall and special charge cask inner wall without bright water,
Slump cone is placed on special charge cask medium position, the concrete specification that the known slump is stirred then is layered dress
Enter in slump cone；（2）The slump cone for having installed concrete and special charge cask are placed on shaking for variant-frequency vibration equipment
On dynamic table top, and special charge cask and the vibration table of variant-frequency vibration equipment are fixed together；（3）Lift slump cone, waits for
Concrete in Natural collapses after extension, sets the vibration frequency f of variant-frequency vibration equipment, opens the vibration control of frequency-conversion control cabinet
System switch, observes the deformability and deformation velocity of concrete, and record is vibrated since vibration table up to concrete filling is full
Special charge cask, and the time of vibration T used in concrete surface whole bleeding；（4）By the height H of special charge cask and directly
The ratio of diameter D is multiplied by vibration frequency f again divided by time of vibration T, the evaluation obtained lead to as the plastic index of concrete
The size of plastic index is crossed come the molding for judging concrete and closely knit complexity.
The present invention combines the practical filling situation in different product concrete scene during vibration moulding, according to concrete
Working performance selects the special charge cask of different size, and the present invention provides further technical solutions：The concrete
Special charge cask is the drum structure of the upper bottom opening of different model specification, in use, being selected according to workability of concrete size
Suitable special charge cask is selected, when concrete slump is less than or equal to 50mm, selects I type container, diameter 240mm, height
Spend 150mm；When concrete slump is more than 50mm and is less than or equal to 120mm, II type container, diameter 320mm, height are selected
75mm；When concrete slump is more than 120mm and is less than or equal to 180mm, III type container, diameter 450mm, height are selected
45mm；When concrete slump is more than 180mm and is less than or equal to 240mm, IV type container, diameter 600mm, height are selected
25mm。
Further, the variant-frequency vibration equipment is hung by vibrator, vibration table, frequency-conversion control cabinet, moving component
And guider, supporting arrangement, slump cone and special charge cask composition；The vibration frequency of variant-frequency vibration equipment is 5Hz
~ 200Hz, precision are more than or equal to 0.1Hz, and amplitude is less than or equal to 20mm, precision is more than or equal to 0.01mm.
Further, the variant-frequency vibration equipment, vibration frequency f when work according to the slump size of concrete into
Row selection, when the slump is less than or equal to 50mm, vibration frequency 100Hz；When concrete slump is more than 50mm and is less than
When equal to 120mm, vibration frequency 75Hz；When concrete slump is more than 120mm and is less than or equal to 180mm, vibration frequency
For 50Hz；When concrete slump is more than 180mm and is less than or equal to 240mm, vibration frequency 25Hz.
Further, the time of vibration is to lift slump cone, waits for that Concrete in Natural collapses to extend and finishes, if
After having set the vibration frequency f of variant-frequency vibration equipment, from the vibration control switch for opening frequency-conversion control cabinet, vibration table starts to shake
It is dynamic to be denoted as vibration initial time, until concrete filling expires special charge cask, and shaking used in concrete surface whole bleeding
Dynamic time T, time of vibration are accurate to 0.1 second.
Further, the fixation between the special charge cask and variant-frequency vibration vibration equipment table top specifically will
Three bolts hole for having both positioning and fixed function that the outer edge of special charge cask bottom is evenly distributed with 120 degree, and shake
Corresponding threaded hole position alignment, is bolted, special charge cask is made to be fixed with variant-frequency vibration equipment table top on dynamic table top
Together.
Further, the concrete slump cylinder, structure size, surface roughness, the depth of parallelism and concentricity symbol
Close JG/T 248《Slumping instrument》Relevant regulations.
Further, the described concrete specification layering being stirred is fitted into slump cone, will be specifically stirred
Concrete points three layers be uniformly packed into slump cones, a layer concrete is often filled, using tamper by edge to center by spiral shape
At uniformly plugging and pounding 25 times, every layer concrete height is about the high one third of cylinder after tamping；When plugging and pounding bottom, tamper should run through whole
A depth, when plugging and pounding the second layer and top layer, tamper should be inserted through the surface of this layer to next layer；When top layer concrete feeds, coagulation
Soil should be higher by nozzle.Nozzle is dropped below as concrete is heavy during plugging and pounding, then should be added at any time.After top layer has plugged and pounded, scrape off
Extra concrete, is used in combination spatula to smooth out.
Further, the plastic index of the concrete is equal to the ratio of the height H and diameter D of special charge cask
It is multiplied by vibration frequency f again divided by the evaluation of time of vibration T, the working performance of concrete is unified into an identical physics
Amount, by the size of plastic index come the molding for judging concrete and closely knit complexity, is embodied in plastic index
It is bigger, during concrete formation needed for the energy that provides it is smaller, the easier molding of concrete and closely knit；Plastic index is got over
It is small, during concrete formation needed for the energy that provides it is bigger, concrete is more difficult to molding and closely knit.
Description of the drawings
Fig. 1 is the variant-frequency vibration equipment schematic diagram of typical evaluation product concrete formability energy provided by the present invention；
Fig. 2 is that the typical plastic performance test fashion material of product concrete provided by the present invention finishes schematic diagram；
Fig. 3 is provided by the present invention typical to lift the extension that collapses of slump cone product Concrete in Natural and finish schematic diagram；
Fig. 4 is filled for typical product concrete provided by the present invention and is finished special container schematic diagram under vibrating conditions；
Fig. 5 is the special charge cask schematic diagram of typical evaluation product concrete formability energy provided by the present invention.
Specific implementation mode
The realization of the present invention is introduced below by way of specific embodiment and possessed advantageous effect, these embodiments are only limitted to
The present invention is illustrated, without limiting the scope of the present invention.Based on the embodiments of the present invention, those of ordinary skill in the art exist
The every other embodiment obtained under the premise of creative work is not made, shall fall within the protection scope of the present invention.
Embodiment 1
An embodiment of the present invention provides a kind of testing equipment and method for evaluating prefabricated sleeper concrete formability energy, tools
Body includes the following contents：
1. variant-frequency vibration equipment described in is as shown in Figure 1, by vibrator（7）, vibration table（4）, frequency-conversion control cabinet（8）, movement
Member hangs and guider（5）, supporting arrangement（6）, slump cone（1）And special charge cask（2）Composition；Become frequency vibration
The vibration frequency of dynamic equipment is 5Hz ~ 200Hz, precision is more than or equal to 0.1Hz, and amplitude is less than or equal to 20mm, precision is more than or equal to
0.01mm；
2. the concrete slump values that Slumping instrument test is newly stirred is used to select diameter for 35mm（D1）For
240mm, height（H1）For the I type charge cask of 150mm（2a）, special charge cask（2）Specification is as shown in figure 5, moistening collapses
Spend cylinder（1）With I type charge cask（2a）, and ensure slump cone（1）Inner wall and I type charge cask（2a）Inner wall is without bright water；
3. by slump cone（1）It is placed on I type charge cask（2a）Medium position, then the concrete being stirred（9）Divide three
Layer is uniformly packed into slump cone（1）It is interior, often fill a layer concrete（9）, uniform by spiralization by edge to center using tamper
It plugs and pounds 25 times, per layer concrete after tamping（9）Height is about the high one third of cylinder；When plugging and pounding bottom, tamper should run through entire
Depth, when plugging and pounding the second layer and top layer, tamper should be inserted through the surface of this layer to next layer；Top layer concrete（9）When charging, coagulation
Soil should be higher by nozzle.Such as concrete during plugging and pounding（9）It is heavy to drop below nozzle, then it should add at any time.After top layer has plugged and pounded, scrape
Remove extra concrete（9）, it is used in combination spatula to smooth out, concrete（9）Charging finishes as shown in Figure 2；
4. concrete will have been installed（9）Slump cone（1）With I type charge cask（2a）It is placed on the vibration of variant-frequency vibration equipment
Table top（4）On, make I type charge cask（2a）The bolt hole that the outer edge of bottom is evenly distributed with 120 degree（10a）With vibration table
（4）Upper corresponding threaded hole position alignment, passes through bolt（3）It connects I type charge cask（2a）With the vibration of variant-frequency vibration equipment
Table top（4）It is fixed together；
5. lifting slump cone（1）, wait for concrete（9）Naturally it collapses after extending, as shown in figure 3, by variant-frequency vibration equipment
Vibration frequency f1 adjust to 100Hz, from open frequency-conversion control cabinet（8）Vibration control switch, vibration table（4）Start to vibrate
It is denoted as vibration initial time, until concrete（9）It is filled with I type charge cask（2a）, as shown in figure 4, and concrete（9）Surface
Time of vibration T1 used in whole bleeding is 25.3 seconds；
6. the prefabricated plastic index of sleeper concrete is equal to I type container（2a）Height（H1）With diameter（D1）Ratio be multiplied by
Vibration frequency f1 is again divided by time of vibration T1, the evaluation obtained are 2.5, and the plastic index of prefabricated sleeper concrete is very
It is small, when molding it is required energy it is larger, concrete formation and closely knit relative difficulty.
Embodiment 2
An embodiment of the present invention provides it is a kind of for evaluate pre-track board concrete formability can testing equipment and method,
Specifically include the following contents：
1. the concrete slump values that Slumping instrument test is newly stirred is used to select diameter for 110mm（D2）For
320mm, height（H2）For the II type charge cask of 75mm（2b）, moisten slump cone（1）With II type charge cask（2b）, and really
Protect slump cone（1）Inner wall and II type charge cask（2b）Inner wall is without bright water；
2. slump cone is placed on II type charge cask（2b）Medium position, then the concrete being stirred（9）Divide three layers
It is uniformly packed into slump cone, often fills a layer concrete（9）, using tamper 25 are uniformly plugged and pounded by spiralization by edge to center
It is secondary, per layer concrete after tamping（9）Height is about the high one third of cylinder；When plugging and pounding bottom, tamper should run through entire depth, insert
When smashing the second layer and top layer, tamper should be inserted through the surface of this layer to next layer；Top layer concrete（9）When charging, concrete（9）It answers
It is higher by nozzle.Such as concrete during plugging and pounding（9）It is heavy to drop below nozzle, then it should add at any time.After top layer has plugged and pounded, scrape off more
Remaining concrete（9）, it is used in combination spatula to smooth out, concrete（9）Charging finishes as shown in Figure 2；
3. concrete will have been installed（9）Slump cone（1）With II type charge cask（2b）It is placed on shaking for variant-frequency vibration equipment
Dynamic table top（4）On, variant-frequency vibration equipment is as shown in Figure 1, make the outer edge of II type charge cask bottom be evenly distributed with 120 degree
Bolt hole（10b）Threaded hole corresponding on vibration table position is aligned, and passes through bolt（3）It connects special charge cask and frequency conversion
The vibration table of vibratory equipment（4）It is fixed together；
4. lifting slump cone（1）, wait for concrete（9）Naturally the extension that collapses finishes, as shown in figure 3, variant-frequency vibration equipment is shaken
Dynamic frequency f2 is adjusted to 75Hz, from unlatching frequency-conversion control cabinet（8）Vibration control switch, vibration table（4）Start vibration to be denoted as
Initial time is vibrated, until concrete（9）It is filled with II type charge cask（2b）, as shown in figure 4, and concrete（9）Surface is complete
Time of vibration T2 used in portion's bleeding is 18.6 seconds；
5. the prefabricated plastic index of sleeper concrete is equal to the height of I type container（H2）With diameter（D2）Ratio be multiplied by and shake
Dynamic frequency f2 is again divided by time of vibration T2, the evaluation obtained are 17.2, and the plastic index of sleeper concrete is general, at
Required energy is little when type, concrete formation and closely knit not difficult.
Embodiment 3
An embodiment of the present invention provides a kind of testing equipment and method for evaluating prefabricated case beam concrete formability energy, tools
Body includes the following contents：
1. the concrete slump values that Slumping instrument test is newly stirred is used to select diameter for 200mm（D4）For
600mm, height（H4）For the IV type charge cask of 25mm（2d）, moisten slump cone（1）Familial combined hyperlipidemia charge cask（2d）, and really
Protect slump cone inner wall（1）Familial combined hyperlipidemia charge cask（2d）Inner wall is without bright water；
2. by slump cone（1）It is placed on IV type container（2d）Medium position, then the concrete being stirred（9）Divide three layers
Uniformly it is packed into slump cone（1）It is interior, a layer concrete is often filled, 25 are uniformly plugged and pounded by spiralization by edge to center using tamper
It is secondary, per layer concrete after tamping（9）Height is about the high one third of cylinder；When plugging and pounding bottom, tamper should run through entire depth, insert
When smashing the second layer and top layer, tamper should be inserted through the surface of this layer to next layer；Top layer concrete（9）When charging, concrete（9）It answers
It is higher by nozzle.Such as concrete during plugging and pounding（9）It is heavy to drop below nozzle, then it should add at any time.After top layer has plugged and pounded, scrape off more
Remaining concrete（9）, it is used in combination spatula to smooth out, concrete（9）Charging finishes as shown in Figure 2；
3. concrete will have been installed（9）Slump cone（1）Familial combined hyperlipidemia container（2d）It is placed on the vibration of variant-frequency vibration equipment
Table top（4）On, variant-frequency vibration equipment is as shown in Figure 1, make IV type container（2d）What the outer edge of bottom was evenly distributed with 120 degree
Bolt hole（10d）With vibration table（4）Upper corresponding threaded hole position alignment, passes through bolt（3）It connects IV type container（2d）
With the vibration table of variant-frequency vibration equipment（4）It is fixed together；
4. lifting slump cone（1）, wait for that Concrete in Natural collapses to extend and finish, as shown in figure 3, the vibration frequency of variant-frequency vibration equipment
Rate f3 is adjusted to 25Hz, from unlatching frequency-conversion control cabinet（8）Vibration control switch, vibration table（4）Start vibration and is denoted as vibration
Initial time, until concrete（9）It is filled with IV type container（2d）, as shown in figure 4, and concrete（9）Surface whole bleeding
Time of vibration T3 used is 12.5 seconds；
5. the plastic index of prefabricated case beam concrete is equal to IV type container（2d）Height（H4）With diameter（D4）Ratio multiply
Again divided by time of vibration T3 with vibration frequency f3, the evaluation obtained is 48, pays the plastic index of box beam concrete in advance
Greatly, energy very little required when molding is easy to in-place forming and closely knit.
Claims (11)
1. a kind of testing equipment and method for evaluating product concrete formability energy, which is characterized in that it includes following
Step：（1）Slump cone and special charge cask are moistened, and ensures slump cone inner wall and special charge cask inner wall without bright
Slump cone is placed on special charge cask medium position by water, then the concrete specification point that the known slump is stirred
In layer loading slump cone；（2）The slump cone for having installed concrete and special charge cask are placed on variant-frequency vibration equipment
Vibration table on, and the vibration table of special charge cask and variant-frequency vibration equipment is fixed together；（3）Lift the slump
Cylinder sets the vibration frequency of variant-frequency vibration equipment, opens shaking for frequency-conversion control cabinet after waiting for Concrete in Natural slump extension
Dynamic control switch, record are vibrated since vibration table, until concrete filling expires special charge cask, and concrete surface is complete
Time of vibration T used in portion's bleeding；（4）The ratio of the height H of special charge cask and diameter D is multiplied by vibration frequency f to remove again
With time of vibration T, the plastic index of the evaluation that is obtained as concrete is judged by the size of plastic index
The molding of concrete and closely knit complexity.
2. the testing equipment and method according to claim 1 for evaluating product concrete formability energy, feature
It is：The special charge cask of the concrete is the drum structure of the upper bottom opening of different model specification, in use, according to
Workability of concrete size selects the special charge cask of appropriate size, when concrete slump is less than or equal to 50mm, selects I
Type container, diameter 240mm, height 150mm；When concrete slump is more than 50mm and is less than or equal to 120mm, II type is selected
Container, diameter 320mm, height 75mm；When concrete slump is more than 120mm and is less than or equal to 180mm, III type is selected to contain
Glassware, diameter 450mm, height 45mm；When concrete slump is more than 180mm and is less than or equal to 240mm, IV type charge is selected
Device, diameter 600mm, height 25mm.
3. the testing equipment and method according to claim 1 for evaluating product concrete formability energy, feature
It is：The variant-frequency vibration equipment, by vibrator, vibration table, frequency-conversion control cabinet, moving component suspension and guider,
Supporting arrangement, slump cone and special charge cask composition；The vibration frequency of variant-frequency vibration equipment is 5Hz ~ 200Hz, precision
More than or equal to 0.1Hz, amplitude is less than or equal to 20mm, precision is more than or equal to 0.01mm.
4. the testing equipment and method according to claim 1 for evaluating product concrete formability energy, feature
It is：The variant-frequency vibration equipment, in use, carry out selecting suitable vibration frequency according to the slump size of concrete,
When the slump is less than or equal to 50mm, vibration frequency 100Hz；When concrete slump is more than 50mm and is less than or equal to
When 120mm, vibration frequency 75Hz；When concrete slump is more than 120mm and is less than or equal to 180mm, vibration frequency is
50Hz；When concrete slump is more than 180mm and is less than or equal to 240mm, vibration frequency 25Hz.
5. the testing equipment and method according to claim 1 for evaluating product concrete formability energy, feature
It is：The time of vibration is to lift slump cone, waits for that Concrete in Natural collapses to extend and finishes, sets variant-frequency vibration
After the vibration frequency f of equipment, from the vibration control switch for opening frequency-conversion control cabinet, vibration table starts to vibrate to be denoted as to vibrate
Begin the time, until concrete filling expires special charge cask, and the time of vibration T used in concrete surface whole bleeding, vibrates
Time is accurate to 0.1 second.
6. the testing equipment and method according to claim 1 for evaluating product concrete formability energy, feature
It is：Fixation between the special charge cask and the vibration table of variant-frequency vibration equipment, specifically holds special charge
Three bolts hole for having both positioning and fixed function that the outer edge of device bottom is evenly distributed with 120 degree, and it is right on vibration table
The threaded hole position alignment answered, is bolted, special charge cask is made to be fixed together with variant-frequency vibration equipment table top.
7. the testing equipment and method according to claim 1 for evaluating product concrete formability energy, feature
It is：The concrete slump cylinder, structure size, surface roughness, the depth of parallelism and concentricity meet JG/T 248
《Slumping instrument》Relevant regulations.
8. the testing equipment and method according to claim 1 for evaluating product concrete formability energy, feature
It is：Described is fitted into the concrete specification layering being stirred in slump cone, specifically by the concrete being stirred point three
Layer is uniformly packed into slump cone, often fills a layer concrete, 25 are uniformly plugged and pounded by spiralization by edge to center using tamper
Secondary, every layer concrete height is about the high one third of cylinder after tamping；When plugging and pounding bottom, tamper should run through entire depth, plug and pound
When the second layer and top layer, tamper should be inserted through the surface of this layer to next layer；When top layer concrete feeds, concrete should be higher by cylinder
Mouthful.
9. dropping below nozzle as concrete is heavy during plugging and pounding, then should add at any time.
10. after top layer has plugged and pounded, scraping off extra concrete, spatula being used in combination to smooth out.
11. the testing equipment and method according to claim 1 for evaluating product concrete formability energy, feature
It is：The plastic index of the concrete, the ratio equal to the height H and diameter D of special charge cask are multiplied by vibration frequency f
Again divided by the evaluation of time of vibration T, the working performance of concrete is unified into an identical physical quantity, by plastic
For the size of index come the molding for judging concrete and closely knit complexity, it is bigger to be embodied in plastic index, concrete at
Energy is smaller needed for type process, concrete it is easier molding and it is closely knit；Plastic index is smaller, during concrete formation
Required energy is bigger, concrete be more difficult to molding and it is closely knit.
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109541187A (en) * | 2018-11-30 | 2019-03-29 | 佛山科学技术学院 | A kind of slump consistancy test instrument |
| CN109633135A (en) * | 2019-01-02 | 2019-04-16 | 上海诚云建设工程质量检测有限公司 | A kind of concrete slump detection device and detection method |
| CN110595947A (en) * | 2019-08-14 | 2019-12-20 | 中国铁道科学研究院集团有限公司铁道建筑研究所 | Method for testing vibration rheological property of cement mortar |
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