CN109278184A - A kind of method that additive reduction concrete slump loss is added in gradation - Google Patents
A kind of method that additive reduction concrete slump loss is added in gradation Download PDFInfo
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- CN109278184A CN109278184A CN201811378386.4A CN201811378386A CN109278184A CN 109278184 A CN109278184 A CN 109278184A CN 201811378386 A CN201811378386 A CN 201811378386A CN 109278184 A CN109278184 A CN 109278184A
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- concrete
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- slump
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28C—PREPARING CLAY; PRODUCING MIXTURES CONTAINING CLAY OR CEMENTITIOUS MATERIAL, e.g. PLASTER
- B28C5/00—Apparatus or methods for producing mixtures of cement with other substances, e.g. slurries, mortars, porous or fibrous compositions
- B28C5/003—Methods for mixing
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- On-Site Construction Work That Accompanies The Preparation And Application Of Concrete (AREA)
Abstract
The invention belongs to building engineering fields, the method that additive reduces concrete slump loss is added more particularly to a kind of gradation, also disclose the car-mounted device that corresponding additive is added by several times, the car-mounted device is made of storage vat, flow type intelligence delivery pump, regulator control system, warning device and transfer pipeline etc., the parameters such as the time and quantity that additive is added provided with each time when factory, this process carries out automatically, the dosage of additive can be manually adjusted, temporarily additionally to adapt to a variety of different requirements.
Description
Technical field
The invention belongs to building engineering fields, and in particular to a kind of gradation addition additive reduction concrete slump loss
Method.
Background technique
In concrete each component, additive is one of essential important component, polycarboxylic acid, naphthalene system, aliphatic etc.
Additive has the constructing operation performance, the physico mechanical characteristic for improving maturing and the durability that improve concrete significant
Effect.The addition of additive can reduce water-cement ratio, improve the early strength of concrete；Summer construction season adds slow setting group
The compound additive divided, can extend concrete can construction operation time；To the requirement of concrete certain properties, can also pass through
Special additive is added to reach.
Clearly stipulate that ready-mixed concrete is discharged into stirring transport from blender in GB/T 14902-2012 " ready-mixed concrete "
The haulage time of vehicle to discharge time are not preferably greater than 90min then should take corresponding effective technology to arrange if you need to extend the shipping time
It applies.Meet this requirement, the application technology of additive is particularly important, and it is even more inclined that concrete mixing plant is usually provided at suburbs
Far, since haul distance is long, in addition being subjected to the various reasons such as traffic congestion, it is non-that the haulage time of concrete delivery truck is greater than 90min
Usually see or even longer, in order to meet the construction requirement in building site, the slump for the concrete mix that dispatches from the factory has to increase very
It is more, the volume of additive certainly will be increased in this way or increases cement and water consumption, and which not only adds costs, and also reduce
Certain characteristics of concrete, this is very unfavorable.
To the addition technique of additive, not yet cause enough attention, concrete mixing plant is all by each ingredient of concrete
It is all added after mixing thoroughly, is sent to construction site with mixer truck, the aquation that cement occurs immediately after preparation for the concrete of factory is anti-
It answers, generates some hydrated products, increase specific surface area, exhausted a part of concrete admixture, be embodied in coagulation
The native slump is reduced, normally referred to as slump-loss, due to some imprevisions, behind mixer truck arrival building site usually
It needs to be detained a period of time, to some concrete columns etc., also commonly uses and manually pour, speed is slow, and concrete slump damages at this time
Mistake is very big, and concrete construction performance is poor, influences concrete pouring quality.Although in this case can be in mixer truck
Additive is added again, increases the slump, but in most cases, building site or the not spare additive of mixer truck, and each vehicle
Concrete property it is not necessarily identical, additive used also tends to difference, and not certain professional knowledge is difficult correctly to grasp,
And directly add water simple and convenient, but this operation seriously affects the quality of concrete works, leading to architectural engineering, there are larger
Hidden danger.
It should also be noted that the factory concrete residence time is too long, the slump is too small, although additive usage can be added,
It is further added by additive usage, additive bucket is promoted to vehicle discharge port, pours into car, other than troublesome in poeration, dosage is also difficult
In strict control, especially in summer Lee's high temperature season, compound additive is generallyd use, i.e., slow setting component is added in additive, such as
Fruit is excessive, is easy to cause concrete coagulating time too long or even overlength and influences construction quality.
The present invention is to adjust the slump of concrete, in time under conditions of not increasing additive total amount to adapt to coagulation
The needs of soil construction.
The slump is too small when concreting, and concrete is not easy vibration compacting, in order to which concrete construction is convenient, water is added to adjust
The violation operations such as the slump, it is necessary to strictly forbid, it is therefore desirable to have the reasonably effective measures of regulation concrete slump.
Summary of the invention
It is this presently, there are aiming at the problem that, the present invention, which provides a kind of gradation additive is added, reduces concrete slump damage
The method of mistake, it is therefore an objective to by changing the adding manner of additive, under conditions of not increasing additive total amount, reduce concrete
Slump-loss, obtain concrete it is longer it is suitable pour the time, avoid some accidents to the shadow for extending the construction time
It rings, improves construction quality.
The method that additive reduces concrete slump loss is added in gradation of the invention, follows the steps below:
(1) according to the additive total amount of concrete proportioning, component is added several times, wherein outer add is added for the first time in mixing plant
The amount of agent is the 70~85% of total weight；
(2) the rear adding apparatus of additive is added on concrete mixing and transporting car, comprising: additive storage tank, flow
Type intelligence delivery pump, regulator control system, transfer pipeline and warning device, wherein the transfer pipeline insertion of flow quantity intelligent type delivery pump is mixed
The material mouth of mixer lorry tail portion；
(3) after concrete reaches building site, the slump target value of the concrete according to needed for building site, concrete slump with
The loss rule of time change and the weight of concrete determine the addition number of the additive of remaining weight 15~30% and every
Secondary additional amount.
Wherein, the flow quantity intelligent type delivery pump has following two kinds of settings:
(1) each secondary feed time and feeding quantity is set as needed when dispatching from the factory；(2) manual operation setting, interim setting are outer
Add the dosage of agent；
Oneself being arranged when flow quantity intelligent type delivery pump dispatches from the factory wherein is closed when concrete mixing and transporting car starts discharging
Dynamic addition programs, will be adjusted residual concrete in concrete mixing and transporting car such as in discharge process, according to interior concrete
The dosage of additive is temporarily arranged in surplus, is arranged using manual operation.
The estimation of residual concrete surplus is in the following ways in the concrete mixing and transporting car:
When mass concrete pumps the positions such as floorboard or bottom plate, according to the flow of delivery pump and time of delivery and combine
The factors estimations such as interior residual quantity range estimation；When pouring column, collar tie beam, concrete consumption is easy to metering, can also estimate
Calculate the quantity of interior residual concrete.
The warning device reminds driver, and the rotating cylinder revolving speed of concrete mixer truck is increased when adding additive, is made
The additive of addition is uniformly mixed.
The rule changed over time according to concrete slump determines that time and quantity are added in additive, concrete is made to collapse
It falls degree value and meets constructing operation requirement in construction period, that is, keep concrete slump variation more steady.
Compared with prior art, the features of the present invention and beneficial effect are:
Inventor in experiments it is found that, it is more obvious that additive is added influence of the opportunity to concrete flowability, additive
When being just added, the curve of slump reduction is slower, but with when the time passage, the loss of the slump accelerates.Additive
A part is first added when using secondary or multiple addition technique, that is, Concrete, then adds a part by several times in the later period, it is right
Concrete slump influence is more obvious, as shown in Figure 1.
For example, the slump cannot be below 120mm when former design requirement concreting, Fig. 1 middle polyline A is concrete stirring
It stands currently used preparation method, i.e., additive is disposably all added, although the starting slump is up to 210mm, energy
Meet only 2 hours concrete working life of construction requirement.B broken line in i.e. Fig. 1 is added in additive by inventor several times, is being matched
The 80% of additive total amount is only added when concrete processed, when undergoing 1.5h, concrete slump is down to 135mm, adds immediately
The 5% of additive total amount reaches the 85% of additive total amount, concrete slump rises to 160mm at this time, until 2h, concrete
The slump is down to 145mm, and adding 6% i.e. additive total amount of additive total amount immediately, up to 91%, concrete slump is gone back up to
165mm, until 2.5h, concrete slump drops to 140mm again, adds additive 9% immediately, and additive is added total at this time
Amount is 100%, and concrete slump rises to 165mm again, until 3 hours, concrete slump is just down to 120mm.It can be seen that outer
Agent is added to be added by several times, working life can extend to 3 hours from 2 hours.Although there are many additive kind, it is substantially all and meets
This rule.Inventor utilizes this feature, changes the Adding Way of additive, and it is longer suitable when pouring to obtain concrete
Between, avoid influence of some accidents to the construction time is extended.
Concrete slump can certainly be made to be always held at more stable state by the way of being at the uniform velocity added dropwise,
But need the rotating cylinder of concrete delivery truck to be always maintained at fair speed rotation at this time, so that the additive being added dropwise is uniformly mixed, this
Sample energy consumption is higher, and practical value is low, therefore the present invention recommends to use intermittent additive process, although work is added in this intermittent gradation
Skill, concrete slump are fluctuated, but concrete is still constantly in good applicable state.
The present invention can not only make concrete in state is preferably poured, and extend and use the time, and in most cases
The dosage of additive can be saved down.
Detailed description of the invention
Fig. 1 is that technique is added to concrete slump loss influence curve in additive of the invention.
Specific embodiment
Preferable examples of the present invention will be described below, it should be understood that preferred embodiment described herein is only used for
The interpretation present invention, is not intended to limit the present invention.
Embodiment 1
Certain comprehensive building underplate concrete engineering, is designed as C40P8 pump concrete, binder total amount 430Kg/
m3, with the common polycarboxylic admixture NJ-3 of certain factory, volume 8.6Kg/m3, water-cement ratio 0.36, slump target value is 170mm,
Farther out due to conveying distance, 2h is needed from factory to building site, in addition some road congestions and building site waiting blanking time etc. can not be pre-
See factor, the concrete of factory must keep preferable flow regime in 2~3h, and it is minimum to pour the period inner concrete slump
140mm can not be lower than.
Temperature was between 25~28 DEG C at that time, and the slump of the concrete of factory is 240mm, but the 1h 45min after factory
130mm is had dropped to, has been lower than desired 140mm, has needed manually to add additive to increase the slump, but scene lacks profession
Technical staff regulates and controls, and difficulty is larger, even directly adds water sometimes, seriously affects casting concrete quality.
In the present embodiment, the present invention is used, has adjusted the addition technique of additive, carries out gradation addition, factory proportion
Admixture dosage is kept to 6.88Kg/m3, 1h45min and 2h15min is separately added into additive 0.82Kg/m after factory3With
0.90Kg/m3, concrete can be made still to can be at good pumpable state in 3h in this way.
Embodiment 2
Certain grange building, has subscribed C30 concrete, and for pouring column and collar tie beam, concrete is mentioned with simple pulley
It rises, manually pours, it is contemplated that the constructing operation phase is long, and mixing plant is supplied with C30 pump concrete, gel material content 340Kg/
m3, compound naphthalene system water reducing admixture 8.0Kg/m3, concrete factory slump 180mm, a vehicle 6m3Concrete is used after transporting to building site
2.5h has just been poured.
It is detected, the concrete strength fluctuation poured is larger, and some reaches 40MPa, and part does not reach C30, analyzes its original
Cause pours the concrete in column in advance, and since fluidity is excessive, coarse aggregate sinks, and homogeneity is just poor, leads to different parts
Strength difference is excessive.The collar tie beam position concrete that later period pours, especially most latter stage pour, due to violation plus water,
Concrete strength only has C25 or so, below standard.
Technical solution of the present invention is used when pouring for the second time, factory concrete reduces the dosage of additive, additional
Agent is 7.6Kg/m3, slump 120mm, transport to behind building site pour in advance smoothly, because of slump-loss material retrogradation after 1.5h, but
Spend concrete 3m3, still have concrete 3m in mixer truck3, equipment is added with additive of the invention immediately, using artificial setting
Additive 1.2Kg is added in charging, and concrete retrogradation again after 40min, there are about concrete 0.6m in mixer truck at this time3, add again immediately
Enter additive 0.3Kg, finished until pouring, through inspection quality qualification.Using the present invention, additive saves 0.90Kg altogether,
The phenomenon that more importantly can at will adding water to avoid construction site, it is ensured that construction quality.
Embodiment 3
Certain engineering has subscribed C30 pump concrete, it is desirable that slump target value is 160mm when concreting, when factory
Concrete slump is 230mm, reaches building site after 1 hour, because of concrete pump fault repair, after vehicle concrete factory
2.5h just begins to use, and concrete slump is only 80mm at this time, has been unable to satisfy pumping requirements, enables configure on vehicle at this time
Present device.
According to former test result, the additive of specified rate correctly joined, the slump of concrete is adjusted to 165mm,
35min is finished, and the final slump is 150mm, can be added with the present invention with accurate measurement, the positive value hot weather construction of this engineering, outside
Add in agent containing slow setting component, it in this way can be to avoid additive is excessively added and lead to that setting time is too long and influences coagulation soil nature
It can be with the project progress of next stage.
Embodiment 4
The target value of certain engineering C40 pump concrete, the slump is 160mm, and construction period, minimum cannot be below
130mm, the concrete slump that dispatches from the factory in the original plan is 240mm, and rear using the present invention, the aliphatic additive that original is added is reduced
1Kg/m3, the factory slump is 180mm, and through experimental tests, the 1.5h slump is down to 150mm, and 2h is reduced to 135mm.
Therefore, aliphatic additive 0.3Kg/m has been added in 2h3, the slump increases to 150mm, and the 2h30min slump is again
It is down to 130mm, 0.3Kg/m is added in 2h30min3, then in 3h 0.4Kg/m is added3, until when 3h20min, concrete slump
Still there is 135mm, it is indicated above that additive is added by several times, the working life of concrete greatly extends using the present invention.
Embodiment 5
Certain engineering Reinforced Concrete bottom plate, pumping, total amount 1200M3Left and right, road farther out, have selected certain factory
UC-2 polycarboxylic acid additive.Using square concrete batching of the invention, the concrete that dispatches from the factory joined the 80% of additive total amount,
It is provided with timing when factory and adds additive again, secondary in four batches to add, 2 small inch after factory, the 4% of addition additive total amount；2
Half an hour adds 5%；3rd hour, add 5%；3rd half small inch, addition 6%, after such concrete factory in 4 hours
It can be used normally, but due to many reasons, each vehicle concrete is different using the time, and most of vehicle is in or so the 2nd hour
Start discharging to pour, be finished before 2 and a half hours, close additive automatic feeding system when blanking pours, does not add outer
Add agent, decreases the dosage of additive.
Finally, it should be noted that the foregoing is only a preferred embodiment of the present invention, it is not intended to restrict the invention,
Although the present invention is described in detail referring to the foregoing embodiments, for those skilled in the art, still may be used
To modify the technical solutions described in the foregoing embodiments or equivalent replacement of some of the technical features.
All within the spirits and principles of the present invention, any modification, equivalent replacement, improvement and so on should be included in of the invention
Within protection scope.
Claims (3)
1. the method that additive reduces concrete slump loss is added in a kind of gradation, it is characterised in that according to the following steps into
Row:
(1) according to the rule of concrete slump loss, the additive usage in concrete mix is added several times, wherein
Additional amount is the 70~85% of total weight to mixing plant for the first time；
(2) the rear adding apparatus of additive is added on concrete mixing and transporting car, comprising: additive storage tank, flow type intelligence
It can delivery pump, regulator control system, transfer pipeline and warning device.
(3) the loss rule of concrete slump target value, concrete slump according to needed for construction site and the weight of concrete
Amount, determines addition number, time and the dosage of the additive of remaining weight 15~30%, makes the rheological behavior of concrete always
The state required in suitable constructing operation.
2. the method that additive reduces concrete slump loss, feature is added in a kind of gradation according to claim 1
It is that the flow quantity intelligent type delivery pump there are following two kinds of settings:
(1) each secondary feed time and feeding quantity is set as needed when dispatching from the factory；(2) manual operation setting, under special circumstances may be used
The dosage of additive is set at any time；
When wherein closing the factory of flow quantity intelligent type delivery pump when concrete mixing and transporting car starts discharging be arranged automatic plus
Expect program, residual concrete in concrete mixing and transporting car is adjusted such as in discharge process, according to interior concrete surplus
The dosage of interim setting additive, is added using manual operation setting.
3. the method that additive reduces concrete slump loss, feature is added in a kind of gradation according to claim 2
Be: the estimation of residual concrete surplus is in the following ways in the concrete mixing and transporting car: mass concrete pump
When sending the positions such as floorboard or bottom plate, according to the flow of delivery pump and time of delivery and the factors such as interior residual quantity range estimation is combined to estimate
It calculates；When carrying out pouring column, collar tie beam, concrete consumption is easier to calculate, and can also estimate interior residual concrete number
It measures.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201811378386.4A CN109278184A (en) | 2018-11-19 | 2018-11-19 | A kind of method that additive reduction concrete slump loss is added in gradation |
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| CN201811378386.4A CN109278184A (en) | 2018-11-19 | 2018-11-19 | A kind of method that additive reduction concrete slump loss is added in gradation |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110981256A (en) * | 2019-12-18 | 2020-04-10 | 竹鹏翔 | Preparation method of admixture for high-performance concrete in severe cold plateau area |
| CN115056356A (en) * | 2022-06-29 | 2022-09-16 | 厦门豪主意智造科技有限公司 | A system and method for remote monitoring and adjustment of vehicle-mounted concrete mixture |
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| CN206455824U (en) * | 2017-02-17 | 2017-09-01 | 南宁市嘉旺水泥制品有限公司 | A kind of concrete admixture add-on system |
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| CN103223696A (en) * | 2013-05-14 | 2013-07-31 | 十九冶成都建设有限公司 | Method for adding concrete secondary fluidizing agent |
| CN203401598U (en) * | 2013-07-19 | 2014-01-22 | 中联重科股份有限公司 | Additive adding system of concrete and concrete mixer truck |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110981256A (en) * | 2019-12-18 | 2020-04-10 | 竹鹏翔 | Preparation method of admixture for high-performance concrete in severe cold plateau area |
| CN115056356A (en) * | 2022-06-29 | 2022-09-16 | 厦门豪主意智造科技有限公司 | A system and method for remote monitoring and adjustment of vehicle-mounted concrete mixture |
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Address after: 211123 Qinglong community, Chunhua street, Jiangning District, Jiangsu, Nanjing Applicant after: Nanjing Youxi Technology Group Co.,Ltd. Address before: 211123 Qinglong community, Chunhua street, Jiangning District, Jiangsu, Nanjing Applicant before: NANJING YOUXI SCIENCE AND TECHNOLOGY LLC |
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Application publication date: 20190129 |