CN108892412A - Lightweight aggregate concrete special additive and its preparation process - Google Patents
Lightweight aggregate concrete special additive and its preparation process Download PDFInfo
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- CN108892412A CN108892412A CN201810824278.9A CN201810824278A CN108892412A CN 108892412 A CN108892412 A CN 108892412A CN 201810824278 A CN201810824278 A CN 201810824278A CN 108892412 A CN108892412 A CN 108892412A
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- lightweight aggregate
- aggregate concrete
- special additive
- concrete special
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- 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
- C04B40/0046—Premixtures of ingredients characterised by their processing, e.g. sequence of mixing the ingredients when preparing the premixtures
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- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
The invention discloses a kind of lightweight aggregate concrete special additive and its preparation process, which includes the component of following parts by weight：160-190 parts of polycarboxylate water-reducer；100-130 parts of slump retaining agent；20-28 parts of sodium gluconate；0.5-1.5 parts of hydroxypropyl cellulose；8-15 parts of thickener；1-1.9 parts of air entraining agent；10-24 parts of sodium nitrite；589.6-665.2 parts of water.Lightweight aggregate concrete special additive in the present invention can increase lightweight aggregate concrete workability and wrapped, reduction lightweight aggregate floating in lightweight aggregate concrete is added and after mix.
Description
Technical field
The present invention relates to additive technical fields, more specifically, it relates to a kind of lightweight aggregate concrete special additive
And its preparation process.
Background technique
Lightweight aggregate concrete refers to the concrete using lightweight aggregate, and apparent density is not more than 1950kg/m3.Lightweight aggregate is mixed
Solidifying soil has the characteristics that lightweight, with the raising to building energy conservation and building functions requirement, high performance lightweight aggregate concrete
Research and be also developed rapidly, but need the research maturing of high performance lightweight aggregate concrete also further
Effort.Therefore, the research of high performance lightweight aggregate concrete is actively developed, meaning is fairly obvious.
However, the density due to lightweight aggregate is smaller, during stirring lightweight aggregate concrete, easily there is lightweight aggregate coagulation
The phenomenon that lightweight aggregate in soil floats, the workability so as to cause lightweight aggregate concrete entirety is poor, and the slump is smaller.Mesh
Before, additive has large effect for the overall performance of lightweight aggregate concrete, therefore, a kind of to improve lightweight aggregate concrete
The research and development of the lightweight aggregate concrete special additive of workability have a vast market foreground.
Summary of the invention
In view of the deficienciess of the prior art, the purpose of the present invention one be to provide a kind of lightweight aggregate concrete it is dedicated additional
Agent has preferable mobility, and in lightweight aggregate concrete mixture mixed process, have increase lightweight aggregate concrete and easily
Property and it is wrapped, and reduce lightweight aggregate float the advantages of.
To achieve the above object one, the present invention provides following technical solutions：
A kind of lightweight aggregate concrete special additive, which is characterized in that the component including following parts by weight：
160-190 parts of polycarboxylate water-reducer；
100-130 parts of slump retaining agent；
20-28 parts of sodium gluconate；
0.5-1.5 parts of hydroxypropyl cellulose；
8-15 parts of thickener；
1-1.9 parts of air entraining agent；
10-24 parts of sodium nitrite；
589.6-665.2 parts of water.
Through the above technical solutions, polycarboxylate water-reducer can subtract under conditions of maintaining concrete slump to be basically unchanged
Few mixing water amount can also have peptizaiton to cement granules, improve the mobility of concrete mix.Sodium gluconate pair
Concrete has deferred action, and sodium nitrite has early strength function, the early strength of strong aggregate concrete can be improved.Hydroxy propyl cellulose
Element has non-ionic nature, the stability of entire additive system can be improved, and be not easily susceptible to the influence of the pH value of system.
Studied (slump, air content test) discovery, sodium gluconate, hydroxypropyl cellulose, sodium nitrite phase interworking
It closes, the additive of formation helps to improve the additive and fill to lightweight aggregate formation during with lightweight aggregate concrete mix
Subpackage is covered, and the phenomenon that making lightweight aggregate float is not easy, to increase lightweight aggregate concrete workability and wrapped.
Further preferably：The lightweight aggregate concrete special additive includes the component of following parts by weight：
160-180 parts of polycarboxylate water-reducer；
100-120 parts of slump retaining agent；
20-25 parts of sodium gluconate；
0.5-1 parts of hydroxypropyl cellulose；
8-13 parts of thickener；
1-1.5 parts of air entraining agent；
10-20 parts of sodium nitrite；
651-665.2 parts of water.
Further preferably：The lightweight aggregate concrete special additive further includes the molasses that parts by weight are 5-10 parts.
Further preferably：The molasses include at least one of cane molasses, corn molasses, beet molasses.
Further preferably：It further include the Tween-80 that parts by weight are 8-15 parts.
Through the above technical solutions, cane molasses, corn molasses, beet molasses have biggish yield and toughness,
Cooperation between retarding effect, stability and the adhesive, with hydroxypropyl cellulose that can increase system in the system of additive
It makes good use of, there is package action to lightweight aggregate, reduce a possibility that lightweight aggregate floats.Polysorbate -80 is soluble easily in water, and has
Excellent stability and diffusivity, it is preferable with the fiting effect of hydroxypropyl cellulose, help to improve entire additive system
Stability.And after mixing with the various components of lightweight aggregate concrete, uniform connection effect can be formed with lightweight aggregate concrete.
Further preferably：The slump retaining agent is polycarboxylic-acid slump retaining agent.
Further preferably：The thickener includes polyacrylamide, polyvinyl alcohol, at least one in sodium polyacrylate
Kind.
Further preferably：The air entraining agent includes alkyl sulfonates air entraining agent, saponin class composite air entraining agent, modified pine
At least one of fragrant hot polymerization species air entraining agent.
Through the above technical solutions, the cohesiveness of concrete mix can be improved in polycarboxylic-acid slump retaining agent, concrete is improved
The anti-isolation of mixture, anti-bleeding performance, and concrete mix is made to obtain the preferable slump.Polycarboxylic-acid slump retaining agent and poly-
Carboxylic acid water reducer mating reaction together guarantees the mobility and operable time of lightweight aggregate concrete.Polyacrylamide, polyethylene
Alcohol, sodium polyacrylate can make the additive to be formed have certain sticky sense, make the more stable of concrete mix, overcome
" grabbing bottom ", " hardened " that concrete mix occurs.Alkyl sulfonates air entraining agent, saponin class composite air entraining agent, modified rosin
Hot polymerization species air entraining agent introduces the function of micro-bubble, improves the package effect to lightweight aggregate, is not easy that lightweight aggregate is made to float, from
And improve the workability of lightweight aggregate concrete.
The purpose of the present invention two is to provide a kind of preparation process of lightweight aggregate concrete special additive.
To achieve the above object two, the present invention provides following technical solutions：
A kind of preparation process of lightweight aggregate concrete special additive, includes the following steps：
The hydroxypropyl cellulose of corresponding parts by weight, thickener are uniformly mixed by S1 with sodium gluconate, form the first mixing
Object；
S2, the first mixture that step S1 is obtained is added into the water of corresponding parts by weight, fills the first mixture by stirring
Dissolution is divided to obtain the second mixture；
S3 sequentially adds air entraining agent, sodium nitrite, polycarboxylate water-reducer, slump retaining agent in the second mixture obtained in S2, often
Time interval 3min~4min is added between kind component, stirring 10min~15min is further continued for after slump retaining agent addition, that is, obtains gently
Aggregate concrete special additive.
Further preferably：In the step S2, the molasses and polysorbate -80 of corresponding parts by weight are added, with water,
One mixture is uniformly mixed.
Through the above technical solutions, increasing the sliminess and adhesive property of the first mixture, shape to a certain extent
At the second mixture, thickener is eventually adding, so that the viscosity of entire liquid-phase system further increases.It so arranges to be added
Component sequence, facilitate the lightweight aggregate concrete special additive for making to be formed with uniform and stable state, and step S1
With the required less energy intensive mixed in S2, energy consumption needed for reducing production on the whole.
In conclusion the invention has the advantages that：
1. sodium gluconate, hydroxypropyl cellulose, sodium nitrite cooperate, make the additive to be formed that there is the shape of stable and uniform
State has sufficient package action to lightweight aggregate after lightweight aggregate concrete mixing, to make that lightweight aggregate is asked easily to be mixed
It is even, to increase the workability of lightweight aggregate concrete, improve the slump；
2. molasses, polysorbate -80, sodium gluconate, hydroxypropyl cellulose, sodium nitrite form complex role, to increase
The adhesive property of additive and flowing new capability, after lightweight aggregate concrete mixing, can by the bubble in lightweight aggregate concrete into
Row is racked or is discharged, and helps to reduce the air content in lightweight aggregate concrete.
Specific embodiment
Below with reference to embodiment, the present invention will be described in detail.
Embodiment 1：Lightweight aggregate concrete special additive, included component and its corresponding parts by weight such as 1 institute of table
Show, and acquisition is made by the steps：
Hydroxypropyl cellulose, thickener are uniformly mixed by S1 with sodium gluconate, form mixture；Form the first mixture；
S2, the first mixture that step S1 is obtained is added into water, so that the first mixture is sufficiently dissolved acquisition second by stirring
Mixture；
S3 sequentially adds air entraining agent, sodium nitrite, polycarboxylate water-reducer, slump retaining agent in the second mixture obtained in S2, often
Time interval 3min~4min is added between kind component, stirring 10min~15min is further continued for after slump retaining agent addition, that is, obtains gently
Aggregate concrete special additive.
Wherein, thickener be parts by weight be 1: 1: 1 polyacrylamide, polyvinyl alcohol, Sodium Polyacrylate mixture；
Air entraining agent is alkyl sulfonates air entraining agent.
Embodiment 2-5：Lightweight aggregate concrete special additive, the difference from embodiment 1 is that, included component and its
Corresponding parts by weight are as shown in table 1.
The component and its corresponding parts by weight that 1 embodiment 1-5 of table includes
Embodiment 6：Lightweight aggregate concrete special additive, the difference from embodiment 1 is that, molasses are cane molasses, jade
The mixture of rice molasses, beet molasses, the ratio of three are 1: 1.5: 1.
Embodiment 7：Lightweight aggregate concrete special additive, the difference from embodiment 1 is that, molasses are cane molasses, jade
The mixture of rice molasses, the ratio of the two are 2.5: 1.
Embodiment 8：Lightweight aggregate concrete special additive, the difference from embodiment 1 is that, it does not include molasses, poly- sorb
Alcohol -80.
Embodiment 9：Lightweight aggregate concrete special additive, the difference from embodiment 1 is that, it does not include molasses.
Embodiment 10：Lightweight aggregate concrete special additive, the difference from embodiment 1 is that, it does not include polysorbate-
80。
Embodiment 11：Lightweight aggregate concrete special additive, the difference from embodiment 1 is that, thickener is parts by weight
For 1: 2 polyacrylamide, hydrophobically modified acrylate copolymer mixture；Air entraining agent is the alkane that weight fraction ratio is 1: 1
Base Sulfonates air entraining agent, saponin class composite air entraining agent.
Comparative example 1：Lightweight aggregate concrete special additive, the difference from embodiment 1 is that, it is not contained in raw material composition
Sodium gluconate, hydroxypropyl cellulose, sodium nitrite, molasses, polysorbate -80, air entraining agent.
Comparative example 2：Lightweight aggregate concrete special additive, the difference from embodiment 1 is that, it is not contained in raw material composition
Sodium gluconate, hydroxypropyl cellulose, sodium nitrite.
Comparative example 3：Lightweight aggregate concrete special additive, the difference from embodiment 1 is that, during the preparation process, it will gather
Carboxylic acid water reducer, slump retaining agent, sodium gluconate, hydroxypropyl cellulose, thickener, air entraining agent, sodium nitrite, water, molasses, poly- mountain
Pears alcohol -80 mixes 20min together.
Test one：The slump, air content test
Test method：By PO42.5R cement 0.472t, fine sand 0.53m3, the haydite 0.59m of < 20mm3, water 0.220t, sufficiently
It is stirred, forms lightweight aggregate concrete mixture, test its slump, the slump after initial slump 225mm, 60min
Degree be 215mm, based on record；Prepare 14 groups of lightweight aggregate concrete mixture, respectively to 15 groups of lightweight aggregate concrete mixs
The additive in lightweight aggregate concrete special additive and comparative example 1-3 in 7.5kg embodiment 1-11 is added in object, sufficiently mixes
It closes, is referred to as test specimen 1-11 and control sample 1-3, then collapse to test specimen 1-11 and control sample 1-3
The detection for degree of falling records data and analyzes；According to GBT14902-2012, gassiness is carried out to every group of lightweight aggregate concrete mixture
The detection of amount, and respectively as test specimen 1-11 and control sample 1-3, it records and analyzes.
Test result：Test specimen 1-11, the slump of control sample 1-3, air content, appearance are as shown in table 2.
2 test specimen 1-11 of table, the slump of control sample 1-3, air content, appearance
As shown in Table 2, lightweight aggregate concrete mixture of the initial slump of test specimen 1-11 than being not added with additive
The slump it is high, and test specimen 1-11, after 120min, the variation of the slump is smaller, and is not added with the light bone of additive
Concrete mix is expected after 60min, and slump reduction degree is obvious.However, in control sample 1-3, after 120min
Half of slump when being almost reduced to initial.And test specimen 1-11 and control sample 1-3 is observed from the appearance, discovery
Test specimen 1-11 does not isolate not bleeding, and lightweight aggregate is wrapped up, and no lightweight aggregate hydro-planing occurs, and control sample 1-3 then has
Different degrees of lightweight aggregate hydro-planing occurs.Above-mentioned difference shows：Sodium gluconate, hydroxypropyl cellulose, sodium nitrite are total
Same-action increases the consistency of slurry in lightweight aggregate concrete, makes slurry more stable and uniform, has preferably package to lightweight aggregate
Effect.
In addition, also knowing from table 2, the air content in control sample 1-2 is significantly lower than the air content of test specimen 1-11,
Wherein, the air content of control sample 1 is minimum.Above-mentioned difference shows：Molasses, polysorbate -80, sodium gluconate, hydroxypropyl are fine
Element, sodium nitrite, air entraining agent collective effect are tieed up, air content and stability in lightweight aggregate concrete mixture slurry are increased, from
And make after asking lightweight aggregate concrete to pour, lightweight aggregate more uniform can be distributed in concrete structure, improve lightweight aggregate concrete
Construct the stability of amount of substance.
The above is only a preferred embodiment of the present invention, protection scope of the present invention is not limited merely to above-mentioned implementation
Example, all technical solutions belonged under thinking of the present invention all belong to the scope of protection of the present invention.It should be pointed out that for the art
Those of ordinary skill for, several improvements and modifications without departing from the principles of the present invention, these improvements and modifications
It should be regarded as protection scope of the present invention.
Claims (10)
1. a kind of lightweight aggregate concrete special additive, which is characterized in that the component including following parts by weight：
160-190 parts of polycarboxylate water-reducer；
100-130 parts of slump retaining agent；
20-28 parts of sodium gluconate；
0.5-1.5 parts of hydroxypropyl cellulose；
8-15 parts of thickener；
1-1.9 parts of air entraining agent；
10-24 parts of sodium nitrite；
589.6-665.2 parts of water.
2. lightweight aggregate concrete special additive according to claim 1, which is characterized in that the lightweight aggregate concrete is special
It include the component of following parts by weight with additive：
160-180 parts of polycarboxylate water-reducer；
100-120 parts of slump retaining agent；
20-25 parts of sodium gluconate；
0.5-1 parts of hydroxypropyl cellulose；
8-13 parts of thickener；
1-1.5 parts of air entraining agent；
10-20 parts of sodium nitrite；
651-665.2 parts of water.
3. lightweight aggregate concrete special additive according to claim 1 or 2, which is characterized in that the lightweight aggregate coagulation
Native special additive further includes the molasses that parts by weight are 5-10 parts.
4. lightweight aggregate concrete special additive according to claim 3, which is characterized in that the molasses include cane suger
At least one of honey, corn molasses, beet molasses.
5. lightweight aggregate concrete special additive according to claim 4, which is characterized in that further include parts by weight be 8-
15 parts of Tween-80.
6. lightweight aggregate concrete special additive according to claim 1 or 2, which is characterized in that the slump retaining agent is poly-
Carboxylic serials slump retaining agent.
7. lightweight aggregate concrete special additive according to claim 1 or 2, which is characterized in that the thickener includes
At least one of polyacrylamide, polyvinyl alcohol, sodium polyacrylate.
8. lightweight aggregate concrete special additive according to claim 1 or 2, which is characterized in that the air entraining agent includes
At least one of alkyl sulfonates air entraining agent, saponin class composite air entraining agent, modified rosin hot polymerization species air entraining agent.
9. a kind of preparation process of lightweight aggregate concrete special additive as described in any one of claim 1-2, special
Sign is, includes the following steps：
The hydroxypropyl cellulose of corresponding parts by weight, thickener are uniformly mixed by S1 with sodium gluconate, form the first mixing
Object；
S2, the first mixture that step S1 is obtained is added into the water of corresponding parts by weight, fills the first mixture by stirring
Dissolution is divided to obtain the second mixture；
S3 sequentially adds air entraining agent, sodium nitrite, polycarboxylate water-reducer, slump retaining agent in the second mixture obtained in S2, often
Time interval 3min ~ 4min is added between kind component, stirring 10min ~ 15min is further continued for after slump retaining agent addition, that is, obtains light bone
Expect concrete special additive.
10. a kind of preparation process of lightweight aggregate concrete special additive according to claim 9, which is characterized in that institute
It states in step S2, the molasses and polysorbate -80 of corresponding parts by weight is added, are uniformly mixed with water, the first mixture.
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| CN201810824278.9A CN108892412B (en) | 2018-07-24 | 2018-07-24 | Admixture special for lightweight aggregate concrete and preparation process thereof |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810824278.9A CN108892412B (en) | 2018-07-24 | 2018-07-24 | Admixture special for lightweight aggregate concrete and preparation process thereof |
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| Publication Number | Publication Date |
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| CN108892412A true CN108892412A (en) | 2018-11-27 |
| CN108892412B CN108892412B (en) | 2021-02-02 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113735486A (en) * | 2021-09-12 | 2021-12-03 | 中建西部建设贵州有限公司 | Additive for light high-strength concrete and preparation method thereof |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101891414A (en) * | 2010-07-07 | 2010-11-24 | 广东省长大公路工程有限公司 | Polycarboxylic acid type special additive for lightweight aggregate concrete |
| CN102531447A (en) * | 2011-12-12 | 2012-07-04 | 山西潞安矿业(集团)有限责任公司 | Special additive for lytag concrete |
| CN105174875A (en) * | 2015-10-15 | 2015-12-23 | 重庆富皇混凝土有限公司 | High-fluidity pumping ceramsite concrete and preparation method thereof |
-
2018
- 2018-07-24 CN CN201810824278.9A patent/CN108892412B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101891414A (en) * | 2010-07-07 | 2010-11-24 | 广东省长大公路工程有限公司 | Polycarboxylic acid type special additive for lightweight aggregate concrete |
| CN102531447A (en) * | 2011-12-12 | 2012-07-04 | 山西潞安矿业(集团)有限责任公司 | Special additive for lytag concrete |
| CN105174875A (en) * | 2015-10-15 | 2015-12-23 | 重庆富皇混凝土有限公司 | High-fluidity pumping ceramsite concrete and preparation method thereof |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113735486A (en) * | 2021-09-12 | 2021-12-03 | 中建西部建设贵州有限公司 | Additive for light high-strength concrete and preparation method thereof |
| CN113735486B (en) * | 2021-09-12 | 2022-06-21 | 中建西部建设贵州有限公司 | Additive for light high-strength concrete and preparation method thereof |
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