CN107063758A - The sample detection method and its mould of a kind of concrete - Google Patents
The sample detection method and its mould of a kind of concrete Download PDFInfo
- Publication number
- CN107063758A CN107063758A CN201710546548.XA CN201710546548A CN107063758A CN 107063758 A CN107063758 A CN 107063758A CN 201710546548 A CN201710546548 A CN 201710546548A CN 107063758 A CN107063758 A CN 107063758A
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- Prior art keywords
- concrete
- cone
- slump
- mould
- cylinder
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Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/02—Devices for withdrawing samples
- G01N1/10—Devices for withdrawing samples in the liquid or fluent state
-
- 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 invention belongs to construction engineering technical field, more particularly, to the sample detection method and its mould of a kind of concrete.Test specimen, handle, hollow plug connector, charging buccal funnel, the feed opening of cone；A pair of handles are symmetrically arranged with the outside of described conical test specimen, the inside of conical test specimen is plugged with hollow plug connector, and the top of hollow plug connector is connected with charging buccal funnel, and the lower end of charging buccal funnel is provided with feed opening.Its fresh concrete sampling at different depth, and then precise determination is completed, the unified mass standard of different depth level in works is significantly improved, and will be emptied in the middle of Control Measures for Concrete Slump heap, be better able to detect the anti-slump degree of concrete.
Description
Technical field
The invention belongs to construction engineering technical field, more particularly, to the sample detection method and its mould of a kind of concrete
Tool.
Background technology
Concrete typically will be by the process, matter of the links to entity structure such as producing, transporting, pouring, vibrating, conserving
Amount has different degrees of influence.Concrete once pours into the mold and completion of vibrating, its most of performance just it has been determined that
It can not change, the thus quality control to fresh concrete also just becomes extremely important.
The Main Means that the detection to fresh concrete parameter is guarantee structural concrete quality in work progress are increased,
But the device of fresh concrete can be taken out from entity structure due to lacking, at present only can be to entering the fresh concrete before mould
Parameter testing is carried out, and influence of the process of vibrating to entity structure concrete can not almost be learnt.And then due to owed to shake caused by
Honeycomb and due to the problems such as surface laitance is serious caused by cross to shake, being seen everywhere in entity structure, therefore had a strong impact on entity
The performance of structure.
Vibrate after completion, concrete is still in fluidised form, in the prior art generally with spade to works surface concrete
It is sampled, and can not be almost sampled for the concrete of the even deeper positions of 200mm below top surface.But because top layer coagulation
There were significant differences sometimes for the performance of soil and inner concrete, vibrates and is not good at that this difference will be aggravated, simultaneously because routine side
Method samples' representativeness is poor, easily causes the erroneous judgement to integrality performance of the structure.
The content of the invention
It is reasonable in design, make in view of the defects and deficiencies of the prior art, the present invention intends to provide one kind is simple in construction
With the sample detection method of convenient concrete.
To achieve the above object, the technical solution adopted by the present invention is：Its sampling detecting step：
Step one：Slump cone and other apparatus are moistened, and cylinder is placed on the rigidity horizonal base plate not absorbed water, is then stepped on pin
Firmly the pedal on both sides, makes slump cone be fixed holding position in charging；
Step 2：Three layers of the concrete sample scuppit point obtained on request is uniformly charged in bucket, made after tamping per floor height
Spend for cylinder it is high 1/3rd or so.Every layer is plugged and pounded 25 times with tamper.Plugging and pounding should be carried out along the hand of spiral by export-oriented center, each time
Plugging and pounding should be uniformly distributed on section.When plugging and pounding a tin side concrete, tamper can be slightly inclined；When plugging and pounding bottom, tamper should be passed through
Entire depth is worn, when plugging and pounding the second layer and top layer, tamper should plug and pound the surface of this layer to next layer；
When pouring top layer, concrete should be poured into and be higher by nozzle；During plugging and pounding, such as concrete is heavy drops below nozzle, then should be with
Shi Tianjia；After top layer has been plugged and pounded, unnecessary concrete is scraped off, and it is floating with spatula.
Step 3：Remove after the concrete on the bottom plate of cylinder side, vertically smoothly lift slump cone.The lift-off of slump cone
Process should be completed in 5-10 seconds；From starting to be charged to the whole process for carrying slump cone and should carry out incessantly, and should be
Completed in 150 seconds；
Step 4：Lift after slump cone, measure the high difference in height between concrete sample peak after slump of cylinder, as should
The slump value of concrete mix；After slump cone lift-off, such as concrete collapses or while cut up phenomenon, then should be again
Sampling is separately determined.As above-mentioned phenomenon still occurs in second of experiment, then it represents that the concrete workability is bad, should record standby
Look into；
Step 5：The cohesiveness and water-retaining property of concrete sample after observation slump.The inspection method of cohesiveness is existed with tamper
The concrete pyramid side collapsed, which is rapped, to be beaten；Now, if cone is gradually sunk, then it represents that cohesiveness is good.If cone
Collapse, partly burst apart or occur segregation phenomenon, then it represents that cohesiveness is bad；Water-retaining property is separated out with thin pulp in concrete mix
Degree is evaluated, and slump cone is separated out after lifting if any more thin pulp from bottom, and the concrete of conical section is also because losing slurry
Aggregate exposure, then show that this concrete mix water-retaining property is bad；After lifting such as slump cone without thin pulp or only a small amount of thin pulp,
Suctioned out from bottom, then it represents that this concrete mix water-retaining property is good；
Step 6：The concrete mix slump is in units of mm, and results expression is accurate to 5mm.
Preferably, the slump cone in described step one is by the test specimen of cone, handle, hollow plug connector, charging
Buccal funnel, feed opening；A pair of handles are symmetrically arranged with the outside of described conical test specimen, the inside of conical test specimen is inserted
Hollow plug connector is connected to, the top of hollow plug connector is connected with charging buccal funnel, and the lower end of charging buccal funnel is provided with feed opening.
Preferably, the truncated cone-shaped cylinder that the slump cone of described slump cone is made up of sheet metal or other metals, its
Inwall should smooth, no concave-convex position, bottom surface and top surface answer that parallel to each other and with cone axis is vertical, and the inner wall size of cylinder is：
200 ± 2mm of base diameter, 100 ± 2mm of top diameter, 300 ± 2mm of height, wall thickness are not less than 1.5mm.
After said structure, the present invention has the beneficial effect that：A kind of sample detection method of concrete of the present invention
And its mould, its sampling method realizes the sampling of the fresh concrete at works middle-range top surface different depth, and then completes essence
Standard is determined, and significantly improves the unified mass standard of different depth level in works, it is ensured that the overall performance of entity structure, is lifted
Construction quality level.The present invention has simple in construction, and it is reasonable to set, the advantages of low manufacture cost.
Brief description of the drawings
In order to illustrate more clearly about the embodiment of the present invention or technical scheme of the prior art, below will be to embodiment or existing
There is the accompanying drawing used required in technology description to be briefly described, it should be apparent that, drawings in the following description are only this
Some embodiments of invention, for those of ordinary skill in the art, without having to pay creative labor, may be used also
To obtain other accompanying drawings according to these accompanying drawings.
Fig. 1 is the structural representation of the present invention.
Embodiment
Below in conjunction with the accompanying drawings, the present invention is further illustrated.
Referring to as shown in figure 1, present embodiment is adopted the following technical scheme that：Its sampling detecting step：
Step one：Slump cone and other apparatus are moistened, and cylinder is placed on the rigidity horizonal base plate not absorbed water, is then stepped on pin
Firmly the pedal on both sides, makes slump cone be fixed holding position in charging；
Step 2：Three layers of the concrete sample scuppit point obtained on request is uniformly charged in bucket, made after tamping per floor height
Spend for cylinder it is high 1/3rd or so.Every layer is plugged and pounded 25 times with tamper.Plugging and pounding should be carried out along the hand of spiral by export-oriented center, each time
Plugging and pounding should be uniformly distributed on section.When plugging and pounding a tin side concrete, tamper can be slightly inclined；When plugging and pounding bottom, tamper should be passed through
Entire depth is worn, when plugging and pounding the second layer and top layer, tamper should plug and pound the surface of this layer to next layer；
When pouring top layer, concrete should be poured into and be higher by nozzle；During plugging and pounding, such as concrete is heavy drops below nozzle, then should be with
Shi Tianjia；After top layer has been plugged and pounded, unnecessary concrete is scraped off, and it is floating with spatula.
Step 3：Remove after the concrete on the bottom plate of cylinder side, vertically smoothly lift slump cone.The lift-off of slump cone
Process should be completed in 5-10 seconds；From starting to be charged to the whole process for carrying slump cone and should carry out incessantly, and should be
Completed in 150 seconds；
Step 4：Lift after slump cone, measure the high difference in height between concrete sample peak after slump of cylinder, as should
The slump value of concrete mix；After slump cone lift-off, such as concrete collapses or while cut up phenomenon, then should be again
Sampling is separately determined.As above-mentioned phenomenon still occurs in second of experiment, then it represents that the concrete workability is bad, should record standby
Look into；
Step 5：The cohesiveness and water-retaining property of concrete sample after observation slump.The inspection method of cohesiveness is existed with tamper
The concrete pyramid side collapsed, which is rapped, to be beaten；Now, if cone is gradually sunk, then it represents that cohesiveness is good.If cone
Collapse, partly burst apart or occur segregation phenomenon, then it represents that cohesiveness is bad；Water-retaining property is separated out with thin pulp in concrete mix
Degree is evaluated, and slump cone is separated out after lifting if any more thin pulp from bottom, and the concrete of conical section is also because losing slurry
Aggregate exposure, then show that this concrete mix water-retaining property is bad；After lifting such as slump cone without thin pulp or only a small amount of thin pulp,
Suctioned out from bottom, then it represents that this concrete mix water-retaining property is good；
Step 6：The concrete mix slump is in units of mm, and results expression is accurate to 5mm.
Wherein, the slump cone in described step one is by the test specimen 1 of cone, handle 2, hollow plug connector 3, charging aperture
Funnel 4, feed opening 5；The outside of described conical test specimen 1 is symmetrically arranged with a pair of handles 2, conical test specimen 1 it is interior
Portion is plugged with hollow plug connector 3, and the top of hollow plug connector 3 is connected with charging buccal funnel 4, and the lower end of charging buccal funnel 4 is set
There is feed opening 5；The truncated cone-shaped cylinder that described slump cone is made up of sheet metal or other metals.Its inwall should smooth, no concave-convex
Position.Bottom surface and top surface answer parallel to each other and with cone axis vertical.Pacify two hands at 2/3rds height outside slump cylinder
Leg pedal is answered in lower end.Cylinder inner wall size be：
200 ± 2mm of base diameter
100 ± 2mm of top diameter
Highly 300 ± 2mm
Wall thickness is not less than 1.5mm
Tamper diameter 16mm, long 600mm rod iron, rounding is answered in end.
Wherein, concrete sample should be randomly selected in concreting place, and sampling frequency should be met the following requirements：
(1) 100 disks processed are often mixed but no more than 100m3Same match ratio concrete, sampling number of times must not be less than once.
(2) when the concrete of the same match ratio per shift's mixing is less than 100 disk, it, which samples number of times, must not still be less than one
It is secondary.
(3) to cast-in-place concrete structure, its test specimen indwelling should also conform to following requirements：
1. each cast-in-place floor is with the concrete of match ratio, and sampling must not be less than once.
2. in each items for acceptance of same construction unit with match ratio concrete, sampling must not be less than once.
(4) to mass fly ash concrete per mixing 500m3One group of test specimen is at least molded, during not enough specified quantity, often
Class is at least molded one group.
Should at least one group of standard specimen of indwelling per sub-sampling（Test specimen i.e. under the conditions of standard curing）, as live same bar
Part conserves the indwelling group number of test specimen, can be according to detail design regulation by form removal, application prestressing force and construction period temporary load(ing) etc.
It needs to be determined that.
The test evaluation of concrete strength
Assessment method has three kinds：Statistical method one（That is statistical method known to standard deviation）, statistical method two（Standard deviation is unknown
Statistical method）And non-statistical method.
(1) evaluated with statistical method one
Ready mixed concrete plant, precast concrete factory and the unit in charge of construction using live concentrated compactness concrete, should be by system
Meter method evaluates concrete strength.
When concrete production condition can be consistent in a long time, and the strength variability base of same kind concrete
When this holding is stable, the tension variance of every batch（σ0）It can consider by constant, its numerical value can produce accumulative according to the previous time
Intensity data is determined.
When evaluating concrete strength with the method, an examination batch should be made up of continuous three groups of test specimens, its intensity level is same
When meet following requirements：
mfcu≥fCu, k+ 0.7 σ 0
fCu, min≥fCu, k- 0.7 σ 0
When strength grade of concrete is not higher than C20, the minimum value of intensity should still meet following formula requirement：
fCu, min≥0.85fCu, k
When strength grade of concrete is higher than C20, the minimum value of intensity should still meet following formula requirement：
fCu, min≥0.90fCu, k
M in formulafcu--- the same average value for checking and accepting batch compressive strength of concrete（N/mm2）
fcu,k--- characteristic value of cubic concrete compressive strength（N/mm2）
σ 0 --- check and accept the standard deviation of batch compressive strength of concrete（N/mm2）
fCu, min--- --- same minimum value for checking and accepting batch compressive strength of concrete（N/mm2）
Note：Above-mentioned probative term is not to be exceeded three months, and is no less than 15 batches in total lot number of this period intensity data.
(2) evaluated with statistical method two
When the working condition of concrete can not be consistent in a long time, and concrete strength variability can not keep stable
Property when, or same kind concrete in previous probative term do not have enough data to check and accept batch concrete cube to determine
During the standard deviation of body compression strength, an examination batch should be made up of the test specimen no less than 10 groups, its intensity meets following public affairs simultaneously
The requirement of formula：
mfuc- λ 1Sfcu≥0.9fcu,k
fcu,min≥λ2fcu,k
S in formulafcu--- the same standard deviation for checking and accepting batch compressive strength of concrete（N/mm2）；
Work as SfcuCalculated value be less than 0.06 fcu,k, take Sfcu=0.06fcu,k。
λ 1 λ 2 --- take by acceptance coefficient, according to the form below.
The acceptance coefficient of concrete strength
(3) evaluated with non-statistical method
The concrete little to the concrete of prefabricated components or the batch of Site that sporadicly produce, is commented by non-statistical method
It is fixed.
When evaluating concrete strength by non-statistical method, its intensity should meet following requirements simultaneously：
mfcu≥1.15fCu, k
fCu, min≥0.95fCu, k
The sample detection method and its mould of a kind of concrete described in present embodiment, its sampling method realize works
The sampling of fresh concrete at middle-range top surface different depth, and then precise determination is completed, significantly improve different deep in works
Spend the unified mass standard of level, it is ensured that the overall performance of entity structure, lift construction quality level；The present invention has structure letter
It is single, set reasonable, the advantages of low manufacture cost.
It is described above, it is merely illustrative of the technical solution of the present invention and unrestricted, those of ordinary skill in the art are to this hair
Other modifications or equivalent substitution that bright technical scheme is made, without departing from the spirit and scope of technical solution of the present invention,
It all should cover among scope of the presently claimed invention.
Claims (3)
1. the sample detection method and its mould of a kind of concrete, it is characterised in that：Its sampling detecting step：
Step one：Slump cone and other apparatus are moistened, and cylinder is placed on the rigidity horizonal base plate not absorbed water, is then stepped on pin
Firmly the pedal on both sides, makes slump cone be fixed holding position in charging；
Step 2：Three layers of the concrete sample scuppit point obtained on request is uniformly charged in bucket, made after tamping per floor height
Spend for cylinder it is high 1/3rd or so；
Every layer is plugged and pounded 25 times with tamper；Plugging and pounding should be carried out along the hand of spiral by export-oriented center, and plugging and pounding for each time should be uniform on section
Distribution；When plugging and pounding a tin side concrete, tamper can be slightly inclined；When plugging and pounding bottom, tamper should run through entire depth, plug and pound second
When layer and top layer, tamper should plug and pound the surface of this layer to next layer；
When pouring top layer, concrete should be poured into and be higher by nozzle；During plugging and pounding, such as concrete is heavy drops below nozzle, then should be with
Shi Tianjia；After top layer has been plugged and pounded, unnecessary concrete is scraped off, and it is floating with spatula；
Step 3：Remove after the concrete on the bottom plate of cylinder side, vertically smoothly lift slump cone；The lift-off process of slump cone
It should be completed in 5-10 seconds；From starting to be charged to the whole process for carrying slump cone and should carry out incessantly, and should be at 150 seconds
It is interior to complete；
Step 4：Lift after slump cone, measure the high difference in height between concrete sample peak after slump of cylinder, as should
The slump value of concrete mix；After slump cone lift-off, such as concrete collapses or while cut up phenomenon, then should be again
Sampling is separately determined；
As above-mentioned phenomenon still occurs in second of experiment, then it represents that the concrete workability is bad, should record for future reference；
Step 5：The cohesiveness and water-retaining property of concrete sample after observation slump；The inspection method of cohesiveness is existed with tamper
The concrete pyramid side collapsed, which is rapped, to be beaten；Now, if cone is gradually sunk, then it represents that cohesiveness is good；If cone
Collapse, partly burst apart or occur segregation phenomenon, then it represents that cohesiveness is bad；Water-retaining property is separated out with thin pulp in concrete mix
Degree is evaluated, and slump cone is separated out after lifting if any more thin pulp from bottom, and the concrete of conical section is also because losing slurry
Aggregate exposure, then show that this concrete mix water-retaining property is bad；After lifting such as slump cone without thin pulp or only a small amount of thin pulp,
Suctioned out from bottom, then it represents that this concrete mix water-retaining property is good；
Step 6：The concrete mix slump is in units of mm, and results expression is accurate to 5mm.
2. the sample detection method and its mould of a kind of concrete according to claim 1, it is characterised in that：Described takes
Sample detects mould by the test specimen (1) of cone, handle (2), hollow plug connector (3), charging buccal funnel (4), feed opening (5)；Institute
A pair of handles (2) are symmetrically arranged with the outside of the conical test specimen (1) stated, during the inside of conical test specimen (1) is plugged with
Empty plug connector (3), the top of hollow plug connector (3) is connected with charging buccal funnel (4), and the lower end of charging buccal funnel (4) is provided with
Feed opening (5).
3. the sample detection method and its mould of a kind of concrete according to claim 2, it is characterised in that：Described takes
Sample detects the truncated cone-shaped cylinder that mould is made up of sheet metal or other metals, and its inwall should smooth, no concave-convex position, bottom surface and top surface
Answer that parallel to each other and with cone axis is vertical, the inner wall size of cylinder is：200 ± 2mm of base diameter, top diameter 100 ±
2mm, 300 ± 2mm of height, wall thickness are not less than 1.5mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710546548.XA CN107063758A (en) | 2017-07-06 | 2017-07-06 | The sample detection method and its mould of a kind of concrete |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710546548.XA CN107063758A (en) | 2017-07-06 | 2017-07-06 | The sample detection method and its mould of a kind of concrete |
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| Publication Number | Publication Date |
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| CN107063758A true CN107063758A (en) | 2017-08-18 |
Family
ID=59613534
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| CN201710546548.XA Pending CN107063758A (en) | 2017-07-06 | 2017-07-06 | The sample detection method and its mould of a kind of concrete |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109030792A (en) * | 2018-04-27 | 2018-12-18 | 浙江工业大学 | The charging process and charging spader of concrete mix slump consistancy test |
| CN113149552A (en) * | 2021-04-15 | 2021-07-23 | 王逵 | Polypropylene fiber concrete and production process thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5240225A (en) * | 1991-10-15 | 1993-08-31 | Deslauriers, Inc. | Plastic slump cone |
| CN101806698A (en) * | 2010-04-01 | 2010-08-18 | 无锡建仪仪器机械有限公司 | Novel V-B consistometer |
| CN105806745A (en) * | 2016-03-18 | 2016-07-27 | 中国建筑股份有限公司 | Device and method for detecting working performance of pervious concrete |
-
2017
- 2017-07-06 CN CN201710546548.XA patent/CN107063758A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5240225A (en) * | 1991-10-15 | 1993-08-31 | Deslauriers, Inc. | Plastic slump cone |
| CN101806698A (en) * | 2010-04-01 | 2010-08-18 | 无锡建仪仪器机械有限公司 | Novel V-B consistometer |
| CN105806745A (en) * | 2016-03-18 | 2016-07-27 | 中国建筑股份有限公司 | Device and method for detecting working performance of pervious concrete |
Non-Patent Citations (4)
| Title |
|---|
| 中华人民共和国住房和城乡建设部: "《GB/T 50080-2016 普通混凝土拌合物性能检验方法标准》", 18 August 2016 * |
| 中华人民共和国住房和城乡建设部: "《JG/T 248-2009 混凝土坍落度仪》", 1 December 2009 * |
| 张丽等: "《土木工程材料》", 31 January 2015, 中国电力出版社 * |
| 薛力梨等: "《土木工程材料实验教程》", 30 June 2016, 中国电力出版社 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109030792A (en) * | 2018-04-27 | 2018-12-18 | 浙江工业大学 | The charging process and charging spader of concrete mix slump consistancy test |
| CN113149552A (en) * | 2021-04-15 | 2021-07-23 | 王逵 | Polypropylene fiber concrete and production process thereof |
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Application publication date: 20170818 |
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