CN101143771B - Light aggregate concrete pumping agent - Google Patents
Light aggregate concrete pumping agent Download PDFInfo
- Publication number
- CN101143771B CN101143771B CN200710053099A CN200710053099A CN101143771B CN 101143771 B CN101143771 B CN 101143771B CN 200710053099 A CN200710053099 A CN 200710053099A CN 200710053099 A CN200710053099 A CN 200710053099A CN 101143771 B CN101143771 B CN 101143771B
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- CN
- China
- Prior art keywords
- aggregate concrete
- concrete
- pumping
- light aggregate
- light
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
- C04B28/02—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing hydraulic cements other than calcium sulfates
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B40/00—Processes, in general, for influencing or modifying the properties of mortars, concrete or artificial stone compositions, e.g. their setting or hardening ability
- C04B40/0028—Aspects relating to the mixing step of the mortar preparation
- C04B40/0039—Premixtures of ingredients
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/00034—Physico-chemical characteristics of the mixtures
- C04B2111/00146—Sprayable or pumpable mixtures
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/91—Use of waste materials as fillers for mortars or concrete
Abstract
The invention relates to a pumping aid in pumping delivery of lightweight aggregate concrete. A lightweight concrete pumping aid is characterized by having a homogeneous mixture made of cellulose ether, polyethylene oxide, methyl cellulose, sodium dodecyl sulfate and siliceous dust, wherein the formulated rate is arranged by weight as: 8-12 portions of cellulose ether, 1-5 portions of polyethylene oxide, 30-300 portions of methyl cellulose, 5-15 portions of sodium dodecyl sulfate and 100-300 portions of siliceous dust. The pumping aid is used for delivery of lightweight aggregate concrete, which can dramatically improve the homogeneousness of lightweight aggregate concrete, reduce the gradual loss in slump of lightweight aggregate concrete, reduce the performance loss in the process of pumping up lightweight aggregate concrete and improve pumping capacity of lightweight aggregate concrete, thereby having a tremendous market potential in the construction of large-span bridges, high-rise buildings and special structures.
Description
Technical field
The present invention relates to a kind of pumping agent that is applicable to the light aggregate concrete of pumping.
Technical background
Along with the fast development of China's building trade and the acceleration of infrastructure construction, light aggregate concrete is widely used in all kinds of engineerings with functional characteristicss such as its lightweight, high-strength and insulation, sound insulation, antidetonations.The development light aggregate concrete is considered to alleviate dead load, the main path that concrete is developed to lightweight, high-strength direction.
But the density of light-weight aggregate is little than cement stone, proportion design or Construction control improperly under the situation light-weight aggregate be very easy to float to concrete surface layer.And light-weight aggregate can absorb moisture in the pumping process from cement slurry, and then cause concrete mix serviceability to descend.The light-weight aggregate suction makes and is easy to produce the problem of stopping up pump line in the light aggregate concrete pumping construction process under the bad and pressure effect of concrete uniformity, thereby influences construction speed, and causes bigger financial loss.Therefore, the pumping of light aggregate concrete is an engineering difficult problem in the light aggregate concrete construction always.
At present people mainly by the light-weight aggregate of prewetting reducing the water absorbing properties of light-weight aggregate under pump function, and then improve pumpability of concrete.But this method there is no remarkable improvement for improving the concrete uniformity, and is difficult to accurate control for the degree of prewetting of light-weight aggregate, make that the success ratio of light aggregate concrete uninterrupted pumping construction is very low, and the pumping distance is shorter.Mainly at the exploitation of common volume-weight concrete, the effect that is applied to light aggregate concrete is unsatisfactory for existing pumping agent.
A kind of light aggregate concrete pumping agent provided by the invention can be under light-weight aggregate be prewetted the short or situation of not prewetting of time, realization is to the pumping construction of the light aggregate concrete of different densities grade, simplify the production technique of light aggregate concrete, improved production efficiency.
Summary of the invention
The object of the present invention is to provide a kind of light aggregate concrete pumping agent that can improve the pump-conveying property of light aggregate concrete.
To achieve these goals, technical scheme of the present invention is: a kind of light aggregate concrete pumping agent, it is characterized in that it is mixed by ether of cellulose, polyoxyethylene, lignin fibre, sodium laurylsulfonate and silicon ash forms, the shared weight part of each raw material is: ether of cellulose 8-12 part, polyoxyethylene 1-5 part, lignin fibre 30-100 part, sodium laurylsulfonate 5-15 part, silicon ash 100-300 part.
Described ether of cellulose is any in methyl hydroxyethylcellulose ether or the methylhydroxypropylcellulose ether, and viscosity is 30000-50000mPaS.
Described polyoxyethylene molecular weight is 500000-1000000.
Described lignin fibre is cotton-shaped lignin fibre.
Described sodium laurylsulfonate is commercially available technical pure sodium laurylsulfonate.
The specific surface area of described silicon ash is 10000-25000m
2/ kg.
The preparation method of above-mentioned a kind of light aggregate concrete pumping agent, be all raw material proportionally weighing good after, add together in single horizontal axis forced mixer simultaneously and stir, stirring gets final product, and generally stirs more than 180 seconds.
The pumping agent volume is the 0.2%-1.0% of gelling material gross weight.
Because the light-weight aggregate of light aggregate concrete has vesicular structure, the reason and the normal concrete of the loss of light aggregate concrete serviceability have than big-difference.The slump of normal concrete through time loss mainly since hydrated cementitious cause; Slump pumping loss mainly is that the formation air pocket is discharged and caused because in the pumping process that the micro-bubble that plays " spot contact bearing " effect in the concrete is compressed together.Light aggregate concrete is then different, and the light-weight aggregate with vesicular structure is from continuing suction the slurry on every side, be cause the light aggregate concrete slump through the time loss major cause; The slump pumping loss of light aggregate concrete then is that the water in the slurry is pressed in the light-weight aggregate and causes owing to concrete in the pumping process is subjected to pump pressure.In a word, the vesicular structure of light-weight aggregate is to cause the light aggregate concrete serviceability to be inferior to the main reason of normal concrete.
Characteristics of the present invention are: at the characteristics of light aggregate concrete serviceability loss, choose reasonable ether of cellulose, polyoxyethylene, lignin fibre, sodium laurylsulfonate be as the major function component of pumping agent, and add the proper amount of silicon ash as solid support material.Above-mentioned raw materials is carried out compound with optimal components ratio, obtain a kind of light aggregate concrete pumping agent, apply it in the light aggregate concrete,, improve its pump-conveying property to improve the uniformity of light aggregate concrete.
More than each material the action effect of light aggregate concrete is seen Table 1.
Each component of table 1 is to the effect of light aggregate concrete
(1) tackify component.Ether of cellulose and polyoxyethylene have higher viscosity, can reduce the bleeding and the laminated segregation of light aggregate concrete, improve the workability of light aggregate concrete.Action effect sees Table 2, table 3.
Table 2 ether of cellulose is to the tackify effect of grout
The ether of cellulose volume is the % that accounts for pumping agent weight in the table 2.Water cement ratio is meant the water cement ratio of cement slurry.
Table 3 polyoxyethylene is to the tackify effect of grout
The polyoxyethylene volume is the % that accounts for pumping agent weight in the table 3.Water cement ratio is meant the water cement ratio of cement slurry.
By table 2, table 3 as seen, ether of cellulose and polyoxyethylene all can improve cement slurry viscosity.This extremely helps reducing the come-up of light-weight aggregate.
(2) water storage component.The ether of cellulose water-retaining capacity is strong, speed is fast, can discharge moisture again when being under pressure.Mix and stir in the process at light aggregate concrete, can earlier the part mixing water be stored in the ether of cellulose, light aggregate concrete is subjected to pump pressure during pumping, the moisture that ether of cellulose can absorb when mixing and stirring discharges, in order to the moisture that is absorbed by light-weight aggregate in the compensation pumping process, reduce the pumping loss of light aggregate concrete.Lignin fibre mixes and stirs in the process at light aggregate concrete also can absorb portion of water, mix and stir finish after, along with the suction of light-weight aggregate, lignin fibre can slowly release the moisture that had before absorbed, reduce the light aggregate concrete slump through time loss.After pumping finishes, the pressure that light-weight aggregate is subjected to reduces suddenly, the moisture that absorbs in the pumping process may be discharged, at this moment, the moisture absorption that ether of cellulose, lignin fibre can discharge light-weight aggregate is again avoided releasing water because of light-weight aggregate and is caused concrete water bleeding and segregation.Concrete mix sees Table 4, and ether of cellulose, lignin fibre see Table 5 to the influence of light aggregate concrete serviceability, and the concrete performance variation sees Table 6 before and after the pumping.
Table 4 light aggregate concrete proportioning
Table 5 light aggregate concrete pumping agent is to the influence of light aggregate concrete serviceability
| Time of repose (min) | The slump (mm) | Divergence (mm) | The normal pressure bleeding rate compares % | The pressure bleeding rate compares % |
| 0 | 225 | 580 | 79 | 84 |
| 30 | 210 | 565 | 81 | 84 |
| 60 | 210 | 540 | 82 | 85 |
| 90 | 190 | 520 | 82 | 86 |
| 120 | 180 | 505 | 84 | 87 |
Concrete performance changes before and after table 6 pumping
| The slump (mm) | Divergence (mm) | |
| Before the pumping | 225 | 580 |
| After the pumping | 210 | 530 |
Annotate: concrete pump is a 37m car pump.
(3) bleed component.Sodium laurylsulfonate is a concrete air entrapment agent commonly used, can introduce a large amount of small bubbles in concrete, can reduce concrete density, and improve concrete flowability.Concrete proportioning sees Table 7, and the pumping agent volume is 1% of a gelling material (concrete and coal ash), and performance sees Table 8.
Table 7 light aggregate concrete proportioning
Table 8 bleed component is to the influence of concrete performance
| The sodium laurylsulfonate volume | The slump (mm) | Do apparent density (kg/m 3) |
| 0 | 190 | 1380 |
| 0.005％ | 190 | 1360 |
| 0.010％ | 200 | 1350 |
| 0.015％ | 215 | 1340 |
| 0.020％ | 220 | 1330 |
| 0.025％ | 230 | 1330 |
| 0.030％ | 230 | 1320 |
The sodium laurylsulfonate volume is the % that accounts for pumping agent weight in the table 8.
In addition, lignin fibre also can disperse, be overlapped to form fibre network in light aggregate concrete, suppresses the light-weight aggregate come-up, further improves the concrete uniformity.Polyoxyethylene has good dissemination as dispersion agent commonly used in the paper industry to lignin fibre, and it is disperseed rapidly in concrete, reduces the concrete churning time, raises labour productivity.
A kind of light aggregate concrete pumping agent provided by the invention is to design at the characteristics of newly mixing water migration in the light aggregate concrete, there is not compound slow setting component, substantially do not influence cement hydration process, avoided because of problem such as slow setting component and the bad concrete coagulating time that causes of cement adaptability be undesired, the cement of each manufacturer production has all been had adaptability preferably.This pumping agent can improve the uniformity of light aggregate concrete significantly, reduce light aggregate concrete the slump through time loss, reduce the light aggregate concrete workability loss in the pumping process, improve the pump-conveying property of light aggregate concrete; In Longspan Bridge, Highrise buildings and unique construction, have broad application prospects.
Embodiment
In order to understand the present invention better, further illustrate content of the present invention below in conjunction with embodiment, but content of the present invention not only is confined to the following examples.
Embodiment 1:
A kind of light aggregate concrete pumping agent, by ether of cellulose 0.8kg, polyoxyethylene 0.1kg, sodium laurylsulfonate 1kg, lignin fibre 5kg, silicon ash 13kg, stirring was prepared from 240 seconds in the input stirrer.Described ether of cellulose is a methyl hydroxyethylcellulose ether, and viscosity is 30000-50000mPaS; Described polyoxyethylene molecular weight is 500000-1000000, and described lignin fibre is cotton-shaped lignin fibre, and described sodium laurylsulfonate is commercially available technical pure sodium laurylsulfonate, and the specific surface area of described silicon ash is 10000-25000m
2/ kg.
During use, take by weighing this pumping agent 1.12kg earlier, earlier all raw materials (table 9) are dropped into stirrer in any order during stirring, restir promptly obtained light aggregate concrete more than 3 minutes, and concrete mix and performance see Table 9 respectively, table 10.Table 11 is as the correlated light aggregate concrete of not mixing pumping agent.Cement and flyash constitute gelling material of the present invention.
Table 9 light aggregate concrete proportioning
| Water | Cement | Flyash | Haydites of book structure | River sand | Water reducer | Pumping agent |
| 168 | 450 | 110 | 586 | 619 | 4.48 | 1.12 |
Annotate: light-weight aggregate is not prewetted before mixing the system concrete.
Table 10 is mixed with the performance of the light aggregate concrete of pumping agent
Table 11 is not mixed the performance of the light aggregate concrete of pumping agent
Embodiment 2: a kind of light aggregate concrete pumping agent, and by ether of cellulose 1kg, polyoxyethylene 0.2kg, lignin fibre 10kg, sodium laurylsulfonate 1.5kg, silicon ash 14kg drops into to stir in single horizontal axis forced mixer and was prepared from 240 seconds.Described ether of cellulose is a methylhydroxypropylcellulose ether, and viscosity is 30000-50000mPaS; Described polyoxyethylene molecular weight is 500000-1000000, and described lignin fibre is cotton-shaped lignin fibre, and described sodium laurylsulfonate is commercially available technical pure sodium laurylsulfonate, and the specific surface area of described silicon ash is 10000-25000m
2/ kg.
During use, take by weighing this pumping agent 2kg earlier, earlier all raw materials (table 12) are dropped into stirrer in any order during stirring, restir promptly obtained light aggregate concrete more than 3 minutes, and concrete mix and performance see Table 12 respectively, table 13.Table 14 is as the correlated light aggregate concrete of not mixing pumping agent.
Table 12 light aggregate concrete proportioning
| Water | Cement | Flyash | Haydites of book structure | River sand | Water reducer | Pumping agent |
| 160 | 412 | 88 | 396 | 613 | 4 | 2 |
Annotate: light-weight aggregate is not prewetted before mixing the system concrete.
Table 13 is mixed with the performance of the light aggregate concrete of pumping agent
Table 14 is not mixed the performance of the light aggregate concrete of pumping agent
Embodiment 3: a kind of light aggregate concrete pumping agent, by ether of cellulose 1.1kg, polyoxyethylene 0.4kg, lignin fibre 3kg, sodium laurylsulfonate 0.5kg, silicon ash 15kg drops into to stir in single horizontal axis forced mixer and was prepared from 240 seconds.Described ether of cellulose is a methyl hydroxyethylcellulose ether, and viscosity is 30000-50000mPaS; Described polyoxyethylene molecular weight is 500000-1000000, and described lignin fibre is cotton-shaped lignin fibre, and described sodium laurylsulfonate is commercially available technical pure sodium laurylsulfonate, and the specific surface area of described silicon ash is 10000-25000m
2/ kg.
During use, take by weighing this pumping agent 2kg earlier, earlier all raw materials (table 15) are dropped into stirrer in any order during stirring, restir promptly obtained light aggregate concrete more than 3 minutes, and concrete mix and performance see Table 15 respectively, table 16.Table 17 is as the correlated light aggregate concrete of not mixing pumping agent.
Table 15 light aggregate concrete proportioning
| Water | Cement | Flyash | Haydites of book structure | Shale pottery sand | Water reducer | Pumping agent |
| 150 | 397 | 77 | 463 | 368 | 3.79 | 2.84 |
Annotate: light-weight aggregate is not prewetted before mixing the system concrete.
Table 16 is mixed with the performance of the light aggregate concrete of pumping agent
Table 17 is not mixed the performance of the light aggregate concrete of pumping agent
Embodiment 4: a kind of light aggregate concrete pumping agent, by ether of cellulose 1.2kg, polyoxyethylene 0.5kg, lignin fibre 10kg, sodium laurylsulfonate 1kg, silicon ash 25kg drops into to stir in single horizontal axis forced mixer and was prepared from 240 seconds.Described ether of cellulose is a methylhydroxypropylcellulose ether, and viscosity is 30000-50000mPaS; Described polyoxyethylene molecular weight is 500000-1000000, and described lignin fibre is cotton-shaped lignin fibre, and described sodium laurylsulfonate is commercially available technical pure sodium laurylsulfonate, and the specific surface area of described silicon ash is 10000-25000m
2/ kg.
During use, take by weighing this pumping agent 3.49kg earlier, earlier all raw materials (table 18) are dropped into stirrer in any order during stirring, restir promptly obtained light aggregate concrete more than 3 minutes, and concrete mix and performance see Table 18 respectively, table 19.Table 20 is as the correlated light aggregate concrete of not mixing pumping agent.
Table 18 light aggregate concrete proportioning
| Water | Cement | Flyash | Haydites of book structure | Shale pottery sand | Water reducer | Pumping agent |
| 143 | 363 | 74 | 393 | 296 | 3.49 | 3.49 |
Annotate: light-weight aggregate is not prewetted before mixing the system concrete.
Table 19 is mixed with the performance of the light aggregate concrete of pumping agent
Table 20 is the performance of the light aggregate concrete of pumping agent not
By embodiment 1-4 as seen, for the sand of different densities, strength grade gently, aggregate concrete gently entirely, a kind of light aggregate concrete pumping agent provided by the invention all has and helps pumping action significantly, obviously improve its serviceability, reduce the concrete dry apparent density, and ultimate compression strength is not had influence substantially.
The bound value and the interval value of ether of cellulose of the present invention, polyoxyethylene, lignin fibre, sodium laurylsulfonate and silicon ash raw material can both be realized the present invention, just do not enumerate embodiment one by one at this.
Claims (3)
1. light aggregate concrete pumping agent, it is characterized in that it is mixed by ether of cellulose, polyoxyethylene, lignin fibre, sodium laurylsulfonate and silicon ash forms, the shared weight part of each raw material is: ether of cellulose 8-12 part, polyoxyethylene 1-5 part, lignin fibre 30-100 part, sodium laurylsulfonate 5-15 part, silicon ash 100-300 part;
Described ether of cellulose is any in methyl hydroxyethylcellulose ether or the methylhydroxypropylcellulose ether, and viscosity is 30000-50000mPaS.
2. a kind of light aggregate concrete pumping agent according to claim 1 is characterized in that: described polyoxyethylene molecular weight is 500000-1000000.
3. a kind of light aggregate concrete pumping agent according to claim 1 is characterized in that: the specific surface area of described silicon ash is 10000-25000m
2/ kg.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200710053099A CN101143771B (en) | 2007-08-31 | 2007-08-31 | Light aggregate concrete pumping agent |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200710053099A CN101143771B (en) | 2007-08-31 | 2007-08-31 | Light aggregate concrete pumping agent |
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| Publication Number | Publication Date |
|---|---|
| CN101143771A CN101143771A (en) | 2008-03-19 |
| CN101143771B true CN101143771B (en) | 2010-05-19 |
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| CN200710053099A Expired - Fee Related CN101143771B (en) | 2007-08-31 | 2007-08-31 | Light aggregate concrete pumping agent |
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Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102101761A (en) * | 2010-12-17 | 2011-06-22 | 上海华联建筑外加剂厂有限公司 | High-water-reduction, low-bleeding, micro-contraction and high-strength pumping aid |
| CN104560350B (en) * | 2014-12-30 | 2017-06-13 | 江苏中铁奥莱特新材料股份有限公司 | A kind of concrete pumping pipe lubricant and preparation method thereof |
| CN105036597B (en) * | 2015-07-24 | 2017-03-01 | 济南四建（集团）有限责任公司 | Friction reducer and the method for reducing the haydite floating degree in pumping haydite concrete are floated in a kind of haydite suppression |
| CN108264299B (en) * | 2018-04-04 | 2020-12-08 | 重庆建工建材物流有限公司 | High-stability pumping structure ceramsite concrete and preparation method thereof |
| CN108751850A (en) * | 2018-06-28 | 2018-11-06 | 吉林建筑大学 | A kind of light porous sound-absorbing wallboard of scoria and preparation method |
| CN109279807A (en) * | 2018-09-20 | 2019-01-29 | 贵州凯襄新材料有限公司 | A kind of pumping admixture suitable for light aggregate concrete |
| CN110304876A (en) * | 2019-06-17 | 2019-10-08 | 三峡大学 | A kind of complete gently haydite concrete and preparation method thereof |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1548395A (en) * | 2003-05-21 | 2004-11-24 | 上海恒福科技发展有限公司 | Concrete pumping aid |
| CN1844020A (en) * | 2006-04-24 | 2006-10-11 | 蒋德双 | Concrete pump and preparation method thereof |
-
2007
- 2007-08-31 CN CN200710053099A patent/CN101143771B/en not_active Expired - Fee Related
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1548395A (en) * | 2003-05-21 | 2004-11-24 | 上海恒福科技发展有限公司 | Concrete pumping aid |
| CN1844020A (en) * | 2006-04-24 | 2006-10-11 | 蒋德双 | Concrete pump and preparation method thereof |
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