CN104865156B - A kind of cement concrete isolation degree evaluation device and its evaluation method - Google Patents
A kind of cement concrete isolation degree evaluation device and its evaluation method Download PDFInfo
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- CN104865156B CN104865156B CN201510249463.6A CN201510249463A CN104865156B CN 104865156 B CN104865156 B CN 104865156B CN 201510249463 A CN201510249463 A CN 201510249463A CN 104865156 B CN104865156 B CN 104865156B
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Abstract
The invention discloses a kind of cement concrete isolation degree evaluation device and its evaluation method, the device to include support member, test parts and density measure part；The support member includes base, armstand, crossbeam, lowering or hoisting gear, bolt；The test parts include fixed screw, vibrating device, material-containing chamber；The density measure part includes column, Density Measuring Instrument, slide rail, fixing device, guide rail.The present invention can simulate the Vibration Condition of cement concrete in transport and process of vibrating, there is provided more real experimental data.It adds density measuring equipment, is capable of the density of accurate measurement cement concrete in real time.The experimental rig of the present invention is easy to operate, good economy performance, and practical value is high.
Description
Technical field
The invention belongs to civil engineering concrete construction field, be related to a kind of cement concrete isolation degree evaluation device and
Its evaluation method, for evaluating the isolation degree of cement concrete, using the teaching of the invention it is possible to provide reliable experimental data.
Background technology
The isolation of concrete is that the cohesive strength between concrete mix composition material is insufficiently resistant to coarse aggregate sinking, is mixed
Coagulate native mixture composition to be separated from each other, cause the uneven phenomenon of internal the Nomenclature Composition and Structure of Complexes.It is usually expressed as coarse aggregate and mortar
It is separated from each other, such as the big particle of density deposits the bottom of big mixture, or coarse aggregate overall separation from mixture comes out.
The reason for causing isolation is probably to pour, and it is improper to vibrate, and maximum particle diameter of gathering materials is excessive, and coarse aggregate ratio is too high, glue
The content of gel material and fine aggregate is relatively low, more excessive than the density of coarse aggregate with fine aggregate, either mixture overdrying or overly moist etc..
Segregation can be reduced using mineral admixture or air entraining agent.
Cement concrete isolation has very big harm, and the isolation of cement concrete influences the apparent effect of concrete structure
There is phenomena such as sand streak, aggregate exposure, reinforcing steel bars exposed in fruit, concrete surface.Concrete strength is significantly declined, have a strong impact on
Concrete structure bearing capacity, the security performance of structure is destroyed, serious will cause to do over again, and cause huge economic loss.From
The homogeneity of bleed cement concrete is poor, causes the contraction at each position of concrete inconsistent, is also easy to produce concrete shrinkage crack.Especially
It is that, because concrete disintegration thickens the grout layer on top layer, contraction increased dramatically when constructing concrete floor, occurs serious
Crack performance.Significantly reduce the endurance quality of the concrete such as concrete impervious, freeze proof.
Currently without the device for directly evaluating cement concrete isolation degree.Now used is all some indirect evaluations
Method, mainly slump method, slump method are to reflect the education resistance energy of reaction concrete, the slump indirectly by cohesiveness
Method can only evaluate initial concrete disintegration degree and can not reflect final isolation degree.This patent can directly evaluate water
The isolation degree of cement concrete, there is provided accurately and reliably experimental data, there is very strong practicality.
The content of the invention
The shortcomings that it is an object of the invention to overcome above-mentioned prior art, there is provided a kind of cement concrete isolates degree evaluation
Device and its evaluation method.
The purpose of the present invention is achieved through the following technical solutions：
This cement concrete isolates degree evaluation device, including support member, test parts and density measure part；Institute
Stating support member includes base, armstand, crossbeam, lowering or hoisting gear, bolt；The test parts include fixed screw, vibrating device,
Material-containing chamber；The density measure part includes column, Density Measuring Instrument, slide rail, fixing device, guide rail；
One end fixed setting armstand of the base, the horizontal fixed setting guide rail of the other end；Pass through liter in the upper end of armstand
Falling unit sets crossbeam, and agitator is fixed with crossbeam；Material-containing chamber is provided with base, is also set between base and material-containing chamber
It is equipped with vibrating device；
Being provided with the guide rail can be fixed on slide rail along horizontal the vertical of slip of guide rail to slide rail, the column,
Density Measuring Instrument is fixed on slide rail, offers some circular holes successively from top to bottom in the side wall of material-containing chamber.
Further, the bottom of above-mentioned base and vibrating device is fixed by bolt and fixed screw.
Above-mentioned Density Measuring Instrument is fixed on slide rail by fixing device.
The present invention also proposes that the test cement concrete based on above-mentioned cement concrete isolation degree evaluation device isolates journey
Assay method is spent, is comprised the following steps：
Material-containing chamber and vibrating device are removed, then equably poured into the cement concrete mixed in material-containing chamber, gently
Knock~under, make concrete compaction, reduce experimental error, then material-containing chamber and vibrating device are fixed on base；
Start lowering or hoisting gear to transfer to agitator in material-containing chamber, start agitator and cement concrete is stirred, together
When Vibration on Start-up device, simulate realistic situation under construction and transportation in cement concrete state, stirring after stop；
Density Measuring Instrument is adjusted, the density of cement concrete is measured by the circular hole on material-containing chamber top, is designated as ρ1, pass through material-containing chamber
The density of the circular hole measurement bottom cement concrete of bottom, is designated as ρ2；
4 calculate concrete disintegration degree L=| ρ1—ρ2|/ρ, isolation degree is bigger, and concrete disintegration is more obvious.
The invention has the advantages that：
1st, device of the invention can simulate the Vibration Condition of cement concrete in transport and process of vibrating, there is provided trueer
Real experimental data.
2nd, device of the invention adds density measuring equipment, is capable of the density of accurate measurement cement concrete in real time.
3rd, test parts are placed on base by device of the invention, more stable.
4th, device of the invention adds actual state of the agitator simulation concrete in transport and cargo handling process, tests number
According to relatively reliable.
5th, evaluation method of the invention proposes a kind of index isolation degree of new evaluation concrete disintegration degree.
6th, experimental rig of the invention is easy to operate, good economy performance, and practical value is high.
Brief description of the drawings
Fig. 1 is the structural representation of the present invention.
Wherein：1 is base；2 be armstand；3 be crossbeam；4 be lowering or hoisting gear；5 be bolt；6 be agitator；7 be column；8
For Density Measuring Instrument；9 be slide rail；10 be fixing device；11 be fixed screw；12 be vibrating device；13 be circular hole；14 be material-containing chamber；
15 be guide rail.
Embodiment
The present invention is described in further detail below in conjunction with the accompanying drawings：
Reference picture 1, the device of evaluation cement concrete of the invention isolation degree include：Support member, test parts and
Density measurement part.The support member includes：
Base 1, make superstructure stable, play a supportive role；
Armstand 2, its effect is that crossbeam is fixed on base, to place experimental part vacating space；
Crossbeam 3, its effect is that agitating device is fixed on above experimental part, convenient to carry out experiment；
Lowering or hoisting gear 4, it is agitating device is entered or depart from 14 material-containing chamber that it, which is acted on,；
Bolt 5, its effect is that test parts are fixed on base；
The test parts include：
Fixed screw 11, its effect is to be combined test parts being fixed on base with fixing bolt 5；
Vibrating device 12, the power that its effect is to provide vibration vibrate 14 material-containing chamber, imitate job site and cement is mixed
Solidifying soil carries out mechanical pudding；
Circular hole 13, it is the density for enabling the direct measurement cement concrete of Density Measuring Instrument 8 that it, which is acted on,；
Material-containing chamber 14, its effect is to hold cement concrete；
The density measurement device includes：
Column 7, its effect is to play a supportive role；
Density Measuring Instrument 8, it is the density for measuring cement concrete that it, which is acted on,；
Slide rail 9, its effect is that Density Measuring Instrument 8 can be slided along vertical direction；
Fixing device 10, its effect is that Density Measuring Instrument 8 is fixed on slide rail 9；
Guide rail 15, it is to make column 7 remote or close to experimental part that it, which is acted on, is convenient for measuring cement concrete density.
The annexation of above all parts is：
One end fixed setting armstand 2 of base 1, the horizontal fixed setting guide rail 15 of the other end；Pass through liter in the upper end of armstand 2
Falling unit 4 sets crossbeam 3, and agitator 6 is fixed with crossbeam 3；Material-containing chamber 14 is provided with base 1, in base 1 and material-containing chamber
Vibrating device 12 is additionally provided between 14；Be provided with the guide rail 15 can along guide rail 15 it is horizontal slide it is vertical to slide rail 9,
The column 7 is fixed on slide rail 9, and Density Measuring Instrument 8 is fixed on slide rail 9, is opened successively from top to bottom in the side wall of material-containing chamber 14
Provided with some circular holes 13.Further：The bottom of base 1 and vibrating device 12 is fixed by bolt 5 and fixed screw 11.Density
Instrument 8 is fixed on slide rail 9 by fixing device 10.
Degree evaluation device, present invention test cement concrete isolation level determinations side are isolated using above cement concrete
Method, comprise the following steps：
(1) material-containing chamber 14 and vibrating device 12 are removed, the cement concrete mixed is equably then poured into charge
In room 14, under gently knocking 4~5, make concrete compaction, reduce experimental error, be then fixed on base 1.
(2) start lowering or hoisting gear 4 to transfer to agitator in material-containing chamber, start agitator 6 and cement concrete is stirred
Mix, while Vibration on Start-up device 12, simulate the state of cement concrete in construction and transportation under realistic situation, stirring vibration
Stop after 10 minutes.
(3) Density Measuring Instrument 8 is adjusted, the density of cement concrete is measured by top circular hole 13, is designated as ρ1, pass through bottom circular hole
The density of 13 measurement bottom cement concretes, is designated as ρ2。
(4) concrete disintegration degree L=is calculated | ρ1—ρ2|/ρ, isolation degree is bigger, and concrete disintegration is more obvious.Wherein ρ is ginseng
Examine the density of concrete.
Claims (2)
1. a kind of cement concrete isolates degree evaluation device, it is characterised in that including：Support member, test parts and density
Measuring part；The support member includes base (1), armstand (2), crossbeam (3), lowering or hoisting gear (4), bolt (5)；The experiment
Part includes fixed screw (11), vibrating device (12), material-containing chamber (14)；The density measure part includes column (7), density
Instrument (8), slide rail (9), fixing device (10), guide rail (15)；
One end fixed setting armstand (2) of the base (1), the horizontal fixed setting guide rail (15) of the other end；In the upper of armstand (2)
End sets crossbeam (3) by lowering or hoisting gear (4), and agitator (6) is fixed with crossbeam (3)；Material-containing chamber is provided with base (1)
(14) vibrating device (12), is additionally provided between base (1) and material-containing chamber (14)；
Being provided with the guide rail (15) can be along the vertical fixed to slide rail (9), the column (7) of the horizontal slip of guide rail (15)
On slide rail (9), Density Measuring Instrument (8) is fixed on slide rail (9), in material-containing chamber (14) if side wall on offer successively from top to bottom
Dry circular hole (13)；The base (1) and the bottom of vibrating device (12) are fixed by bolt (5) and fixed screw (11)；It is described
Density Measuring Instrument (8) is fixed on slide rail (9) by fixing device (10).
A kind of 2. test cement concrete isolation degree of the isolation of cement concrete according to claim 1 degree evaluation device
Assay method, it is characterised in that comprise the following steps：
(1) material-containing chamber (14) and vibrating device (12) are removed, the cement concrete mixed is equably then poured into charge
In room (14), under gently knocking 4~5, make concrete compaction, experimental error is reduced, then by material-containing chamber (14) and vibrating device (12)
Fixed on base (1)；
(2) start lowering or hoisting gear (4) to transfer to agitator (6) in material-containing chamber (14), start agitator (6) to cement concrete
It is stirred, while Vibration on Start-up device (12), simulates the state of cement concrete in construction and transportation under realistic situation,
Stop after stirring；
(3) Density Measuring Instrument (8) is adjusted, the density of cement concrete is measured by the circular hole (13) on material-containing chamber (14) top, is designated as ρ1,
The density of bottom cement concrete is measured by the circular hole (13) of material-containing chamber (14) bottom, is designated as ρ2；
(4) concrete disintegration degree L=is calculated | ρ1—ρ2|/ρ, wherein ρ are the density with reference to concrete；The bigger concrete of isolation degree
Isolation is more obvious.
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| CN105606791B (en) * | 2015-12-28 | 2017-05-24 | 河海大学 | Device and method for testing segregation degree of cement stabilized macadam |
| CN105784543B (en) * | 2016-05-25 | 2018-03-23 | 王壹帆 | A kind of waste rubber tyre powder rubber asphalt isolation test and assessment method |
| CN105973751A (en) * | 2016-06-30 | 2016-09-28 | 长安大学 | Device and method for acquiring segregation degrees of cement concrete under horizontal centrifugal effects |
| CN106706754B (en) * | 2016-12-30 | 2023-05-26 | 中国石油天然气集团公司 | Experiment system and experiment method for mechanical vibration cement paste |
| CN107202747B (en) * | 2017-06-16 | 2018-11-02 | 中国矿业大学 | Mineral grain coagulation Tachistoscope instrument and its method |
| CN107480463B (en) * | 2017-09-07 | 2020-02-04 | 中国建筑土木建设有限公司 | Method for calculating segregation degree of bubbles in cement concrete structure |
| CN108107193A (en) * | 2017-12-15 | 2018-06-01 | 哈尔滨工业大学 | A kind of test device and method of fresh concrete education resistance energy |
| CN108646005A (en) * | 2018-05-04 | 2018-10-12 | 武汉理工大学 | A kind of portable chutable concrete segregability test bar |
| CN108931626A (en) * | 2018-05-04 | 2018-12-04 | 武汉理工大学 | A kind of chutable concrete isolation rate test barrel |
| CN109459353B (en) * | 2018-12-24 | 2024-04-09 | 长安大学 | Detection device and detection method for evaluating segregation degree of granular materials |
| CN109884285A (en) * | 2019-03-06 | 2019-06-14 | 山东省交通科学研究院 | A kind of test method for Under Concrete isolation degree of vibrating |
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| JP3565588B2 (en) * | 1994-11-07 | 2004-09-15 | エンドレス ウント ハウザー フローテック アクチエンゲゼルシャフト | Vibration type measuring instrument |
| CN101692083B (en) * | 2009-10-12 | 2013-01-23 | 北京科技大学 | Quick measuring device for concrete slump and usage method |
| CN202649075U (en) * | 2012-07-03 | 2013-01-02 | 长安大学 | Simple segregation intensity evaluation equipment for fresh mixed concrete |
| CN102749439B (en) * | 2012-07-03 | 2015-04-22 | 长安大学 | Test and evaluation device for segregation of fresh concrete |
| CN204613058U (en) * | 2015-05-15 | 2015-09-02 | 长安大学 | A kind of cement concrete segregation degree evaluation device |
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