CN107500597A - A kind of non-dispersible underwater concrete additive and preparation method thereof - Google Patents
A kind of non-dispersible underwater concrete additive and preparation method thereof Download PDFInfo
- Publication number
- CN107500597A CN107500597A CN201710882108.1A CN201710882108A CN107500597A CN 107500597 A CN107500597 A CN 107500597A CN 201710882108 A CN201710882108 A CN 201710882108A CN 107500597 A CN107500597 A CN 107500597A
- Authority
- CN
- China
- Prior art keywords
- underwater concrete
- defoamer
- concrete additive
- dispersible underwater
- air entraining
- 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
- 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
- C04B24/00—Use of organic materials as active ingredients for mortars, concrete or artificial stone, e.g. plasticisers
- C04B24/24—Macromolecular compounds
- C04B24/28—Macromolecular compounds obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
- C04B24/287—Polyamides
-
- 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
- C04B28/04—Portland cements
-
- 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
- C04B2111/20—Resistance against chemical, physical or biological attack
- C04B2111/27—Water resistance, i.e. waterproof or water-repellent materials
- C04B2111/275—Making materials water insoluble
-
- 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
- C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
- C04B2201/50—Mortars, concrete or artificial stone characterised by specific physical values for the mechanical strength
Abstract
The present invention proposes a kind of non-dispersible underwater concrete additive and preparation method thereof, and composition includes：Modified flocculant solution, polycarboxylate water-reducer, defoamer and air entraining agent；Respectively composition is by mass percentage：Modified flocculant solution 74~92%, polycarboxylate water-reducer 7~25%, defoamer 0.02~0.6%, air entraining agent 0.01~0.5%, the cohesiveness of underwater concrete can be effectively improved, ensure intensity of the concrete under water in environment, be effectively improved the service behaviour of concrete.
Description
Technical field
The invention belongs to technical field of concrete, and in particular to a kind of non-dispersible underwater concrete additive and its preparation side
Method and application.
Background technology
The research and application of non-dispersible underwater concrete have the history of more than 40 years, are led in water conservancy, bridge, ocean engineering etc.
Domain has played great function, turns into a professional technique to attract people's attention in modern concrete construction technology.Although cement is water
Hard material, if but when concrete mix is placed directly within water environment, due to the flushing action of water, aggregate will be with cement point
From, partly it is taken away by the water, is partly chronically at suspended state, the ability for making cement lose cementing aggregate, so in water directly
Connect the concrete mix poured and slurry aggregate separated typically occurs, and then engine request can not be met.Therefore, tradition is underwater mixed
Native construction requirement is coagulated to be to pour under conditions of environment water segregation, and casting process can not interrupt, to reduce the unfavorable shadow of water
The shortcomings of ringing, but bringing that quantities is big, cost is high and be long in time limit.
Pile foundation concrete is a kind of typical underwater concrete, due to be all in construction by the way of underwater grouting,
The concrete poured generally requires to improve two grades to avoid the intensity caused by concrete occurs disperseing under water
Loss, but long-term practice shows, even if label improves two grades, the quality of underwater pile concrete is still difficult to ensure that, its
Reason is the dispersion effect that normal concrete cohesiveness can not meet underwater environment, and concrete is being easy to out after by flow action
Now wrap up in water, folder mud even broken pile.
Scattering problem under pile foundation concrete water is solved, it is necessary to improve the toughness of concrete mix, enhancing water resistant washes energy
Power.At present on dispersion resistance can additive both at home and abroad have relevant report, this kind of additive mainly have flocculant and
Adjuvant forms, and the main viscosity for improving cement slurry of addition of wherein flocculant, is largely divided into water-soluble cellulose ether class
And water-soluble acrylic polymers, its major function are all the sliminesses for increasing concrete mix；It is either water-soluble
The linear polymer such as cellulose ether or water-soluble propylene acids, polyacrylamide viscosity under high ion concentration reduces substantially,
Easily occurred to mix phenomenon, and it can be dehydrated again in dry conditions and volume contraction occurs, the shortcomings of causing concrete shrinkage big
Also increasingly show；Water consumption, increase intensity when the main function of adjuvant is reduction concrete underwater casting, improvement concrete
Mobility and reduce the volume of flocculant, adjuvant is mainly made up of water reducer, and it needs with flocculant have good phase
Capacitive, but on its system proportioning without research in detail.
The content of the invention
The present invention proposes a kind of non-dispersible underwater concrete additive and preparation method thereof regarding to the issue above, can be effective
The cohesiveness of underwater concrete is improved, ensures intensity of the concrete under water in environment, is effectively improved the service behaviour of concrete.
Specific technical scheme is as follows：
A kind of non-dispersible underwater concrete additive, composition include：Modified flocculant solution, polycarboxylate water-reducer,
Defoamer and air entraining agent；Respectively composition is by mass percentage：Modified flocculant solution 74~92%, polycarboxylate water-reducer 7~
25%th, defoamer 0.02~0.6%, air entraining agent 0.01~0.5%.
Further, the preparation method of the modified flocculant solution：Modified flocculant is soluble in water, in inert gas
Protection is lower to add initiator initiated polymerization, and reaction terminates to obtain modified flocculant solution；Modified flocculant is acryloyl
The three-dimensional netted stereochemical structure that amine is polymerized with internal crosslinker；The weight average molecular weight of the modified flocculant is 10,000,000~8000
Ten thousand.
Further, the mol ratio of the acrylamide and internal crosslinker is 1：(0.001~0.5).
Further, the initiator amount is the 0.1~5% of acrylamide quality；The initiator is redox
Type initiator, wherein, the mol ratio of oxidant constituents and reducing agent component>1:1；The oxidant constituents are ammonium persulfate, mistake
One or more in potassium sulfate, sodium peroxydisulfate and hydrogen peroxide etc.；Reducing agent component is ferrous sulfate, bisulfites, sulfurous
One or more in hydrochlorate, ascorbic acid etc..
Further, both solid content is 0.5~1.5%, preferably 1% to the mass fraction of the modified flocculant solution；Should
Mass fraction dilutes to obtain by adding deionized water.
Further, the reaction temperature of the polymerisation is 20~60 DEG C, and the reaction time is 3~6h.
Further, the defoamer is in polyether antifoam agent, silicone emulsion and polyether modified siloxane class defoamer etc.
One or more；Preferred, polyethers defoamer of the present invention.
Further, the air entraining agent is that polyethers air entraining agent, alkyl benzene sulfonate air entraining agent and modified triterpenoid saponin draw
One or more in gas agent etc., preferred, polyethers air entraining agent of the present invention.
The preparation method of non-dispersible underwater concrete additive of the present invention：Modified flocculant solution, polycarboxylic acids are subtracted
Aqua, defoamer and air entraining agent are mixed evenly in proportion, you can obtain non-dispersible underwater concrete additive.
Non-dispersible underwater concrete additive of the present invention is after flocculant, water reducer and other auxiliary agents are blended
Product is compounded, may be directly applied in existing conventional underwater cast-in-place pile concrete, volume scope is binder materials quality
1.5%~3%.
Modified flocculant used in the present invention is raw material by acrylamide, internal crosslinker, polymerize under initiator effect and
Into, three-dimensional netted stereochemical structure can be formed between gelling material particles, can effectively solve traditional fibre element ether or water solubility third
The linear flocculants such as diluted acid class, polyacrylamide viscosity under high ion concentration reduces, and easily occurs mixing phenomenon so as to cause
Concrete shows the problems such as " flocculence "；Meanwhile existing polycarboxylate water-reducer and initiator, defoamer are combined to underwater
The adjustment effect of concrete capable of not dispersing performance, non-dispersible underwater concrete additive compatibility is good made from guarantee, and concrete glues
Poly- property is good, can effectively avoid the loss of strength caused by concrete occurs disperseing under water, and plays flocculant water resistant point
Advantage is dissipated, the mobility poor triggered due to flocculant is avoided while strengthening concrete cohesiveness.
Compared with prior art, the beneficial effects of the invention are as follows：
(1) non-dispersible underwater concrete additive of the present invention uses cross-linking type flocculation system, can effectively solve to pass
The linear flocculants such as cellulose ether or water-soluble propylene acids, polyacrylamide of uniting viscosity under high ion concentration reduces, easily
Occurred mixing phenomenon so as to cause concrete to show " flocculence ", the problems such as influenceing mechanical execution, coagulation can be effectively improved
The service behaviour of soil.
(2) non-dispersible underwater concrete additive of the present invention can effectively improve the cohesiveness of underwater concrete, resist and divide
Dissipate excellent performance, it is ensured that the concrete intensity in environment under water, mitigate mixing plant to make up underwater concrete loss of strength
And increasing cost pressure caused by cement consumption, cement number of dropouts is less than 3%, and 7 days land and water intensity ratios are more than 75%, 28 sky and water
Lu Qiangdu ratios are more than 85%.
(3) additive of the present invention is the joint product of modified flocculant and adjuvant, utilizes collapse protective poly-carboxylic acid
The slowly releasing effect of water reducer, the rate of adsorption of the regulation and control diminishing agent molecule on cement and its hydrated product, so for preparing is mixed
Solidifying soil has good scattered and slump-retaining, the concrete of preparation is had preferably from close using bubble optimization auxiliary agent
Reality.
Embodiment
It to make technical scheme become apparent from clearly, and can be practiced according to the content of specification, and be
The above and other objects, features and advantages of the present invention can be become apparent, below in conjunction with preferred embodiment, specifically
Bright as follows, any scheme drawn to the technical characteristic progress equivalencing of technical solution of the present invention and conventional reasoning each falls within this
Invention protection domain.
Embodiment one
A kind of non-dispersible underwater concrete additive, its composition include：Mass fraction is 1% modified flocculant solution
XN-1, polycarboxylate water-reducer, polyethers defoamer prevol 544x and air entraining agent AE- II, each composition is by mass percentage
It is calculated as：Modified flocculant solution 87%, polycarboxylate water-reducer 8%, polycarboxylate water-reducer 4%, defoamer 0.6%, air entraining agent
0.4%；Said components are gradually added in reactor by proportioning, stirred, produce non-dispersible underwater concrete additive W-
1。
Wherein, the modified flocculant solution XN-1 is equipped with Dropping feeder, agitator, condenser pipe, thermometer, nitrogen
In the four round flask of gatherer, 100g deionized water, 15g acrylamide monomer, 0.65g N, N'- Asia are added
Bisacrylamide, stir until monomer all dissolvings, and be passed through nitrogen, replace the air in flask；It is then heated to 40
DEG C, 0.1g ammonium persulfate is added, for 0.05g sodium sulfites into flask, it is 40 DEG C to continuously stir and keep flask interior temperature,
Constant temperature polymerisation 4 hours, is down to after being stored at room temperature 12h, adds deionized water dilution, and it is about for 1% to obtain mass fraction
Modified flocculant solution XN-1.
Embodiment two
A kind of non-dispersible underwater concrete additive, its composition include：Mass fraction is 1% modified flocculant solution
XN-2, polycarboxylate water-reducer, each composition described in polyethers defoamer prevol 544x and air entraining agent AE- II is by mass percentage
It is calculated as：Modified flocculant solution 84.2%, polycarboxylate water-reducer A 10%, polycarboxylate water-reducer B 5%, defoamer 0.3%, draw
Gas agent 0.5%；Said components are gradually added in reactor by proportioning, stirred, obtain non-dispersible underwater concrete additive
W-2。
Wherein, the modified flocculant solution XN-2 is equipped with Dropping feeder, agitator, condenser pipe, thermometer, nitrogen
In the four round flask of gatherer, 100g deionized water, 15g acrylamide monomer, 0.3g N, N'- methylenes are added
Base bisacrylamide, stir until monomer all dissolves；Nitrogen is passed through, replaces the air in flask；40 DEG C are heated to, then will
0.1g ammonium persulfate, 0.05g sodium sulfites are added in flask, are continuously stirred and are kept flask interior temperature as 40 DEG C of beginnings
Polymerization, isothermal reaction 4 hours is added, is down to and is stored at room temperature 12h；Then add deionized water and dilute to obtain mass fraction for 1%
Modified flocculant XN-2.
Embodiment three
A kind of non-dispersible underwater concrete additive, its composition include：The modified flocculant solution XN- of mass fraction 1%
3, polycarboxylate water-reducer, polyethers defoamer prevol 544x and air entraining agent AE- II, each composition is by mass percentage
For：Modified flocculant solution 85%, polycarboxylate water-reducer A9%, polycarboxylate water-reducer B 5%, defoamer 0.4%, air entraining agent
0.6%；Said components are gradually added in reactor, stir to obtain non-dispersible underwater concrete additive W-3.
Wherein, the modified flocculant solution XN-3 is equipped with Dropping feeder, agitator, condenser pipe, thermometer, nitrogen
In the four round flask of gatherer, 100g deionized water, 15g acrylamide monomer, 0.25g two acryloyls are added
Piperazine, stir until monomer all dissolves；Nitrogen is passed through, replaces the air in flask；40 DEG C are heated to, then by 0.12g's
Ammonium persulfate, 0.08g ascorbic acid are added in flask, are continuously stirred and are kept flask interior temperature to start to polymerize for 40 DEG C,
Isothermal reaction 4 hours is added, is down to and is stored at room temperature 12h；Then deionized water is added to dilute to obtain the modification that mass fraction is 1%
Flocculant XN-3.
Non-dispersible underwater concrete additive described in the embodiment of the present invention is subjected to dependent Concrete test.C35 is underwater
Concrete capable of not dispersing specific raw material proportioning according to table 1 is made.Testing concrete performance is tested according to DL-T 5117-
2000《Non-dispersible underwater concrete testing regulations》Relevant regulations perform, and testing concrete performance the results are shown in Table 2.
Table 1 is C35 non-dispersible underwater concretes experiment proportioning
Note：The implication of admixture dosage is that additive accounts for binder materials (i.e. cement, miberal powder, flyash gross weight by weight
Amount) percentage；Wherein, cement is the Portland cements of P.O 42.5 of Zhenjiang Tai Ni cement plants production；Miberal powder is military new
Mineral powder plant produces；Flyash is that sun patrols II grade of ash；Grain fineness number modulus is 2.8；Rubble is that particle diameter is the broken of 5-20mm continuous gradings
Stone.
Table 2 is concrete performance
As known from Table 2：Using additive of the present invention, testing concrete performance result is satisfied by DL-T 5117-2000
《Non-dispersible underwater concrete testing regulations》It is required that and additive of the present invention is mixed to working performance of concrete and power
It is little to learn performance inconsistency.And additive prepared by traditional linear polyacrylamide flocculant is mixed, the mobile performance of concrete
There is small elevation, but from the point of view of cement number of dropouts and suspended things content, its anti-dispersibility has a certain degree of weakening, and then
Concrete strength is caused to decrease, this may be different from flocculating agent molecule structure, to the anchoring ability of gelling material particles
Caused by difference.Flocculant its molecular structure in additive of the present invention is three-dimensional netted stereochemical structure, to
Grain absorption affinity is stronger, and under high ion concentration, netted stereochemical structure is more stable, efficiently solves conventional linear polypropylene
The problem of amide-type flocculant causes viscosity to decline because ion concentration is too high, and anti-dispersibility weakens.
Claims (10)
1. a kind of non-dispersible underwater concrete additive, it is characterised in that composition includes：Modified flocculant solution, poly- carboxylic
Sour water reducer, defoamer and air entraining agent；Respectively composition is by mass percentage：Modified flocculant solution 74~92%, polycarboxylic acids
Water reducer 7~25%, defoamer 0.02~0.6%, air entraining agent 0.01~0.5%.
2. a kind of non-dispersible underwater concrete additive as claimed in claim 1, it is characterised in that the modified flocculant is molten
The preparation method of liquid：Modified flocculant is soluble in water, initiator initiated polymerization, reaction are added under inert gas shielding
Terminate to obtain modified flocculant solution；Modified flocculant is the three-dimensional netted solid that acrylamide is polymerized with internal crosslinker
Structure；The weight average molecular weight of the modified flocculant is 10,000,000~80,000,000.
A kind of 3. non-dispersible underwater concrete additive as claimed in claim 2, it is characterised in that the acrylamide with it is interior
The mol ratio of crosslinking agent is 1：(0.001~0.5).
4. a kind of non-dispersible underwater concrete additive as claimed in claim 2, it is characterised in that the initiator amount is
The 0.1~5% of acrylamide quality；The initiator is redox type initiator, wherein, oxidant constituents and reducing agent group
The mol ratio divided>1:1；The oxidant constituents be one kind in ammonium persulfate, potassium peroxydisulfate, sodium peroxydisulfate and hydrogen peroxide etc. or
It is several；Reducing agent component is the one or more in ferrous sulfate, bisulfites, sulphite, ascorbic acid etc..
5. a kind of non-dispersible underwater concrete additive as claimed in claim 2, it is characterised in that the modified flocculant is molten
Both solid content is 0.5~1.5%, preferably 1% to the mass fraction of liquid；The mass fraction dilutes to obtain by adding deionized water.
A kind of 6. non-dispersible underwater concrete additive as claimed in claim 2, it is characterised in that the polymerisation it is anti-
It is 20~60 DEG C to answer temperature, and the reaction time is 3~6h.
7. a kind of non-dispersible underwater concrete additive as claimed in claim 1, it is characterised in that the defoamer is polyethers
One or more in defoamer, silicone emulsion and polyether modified siloxane class defoamer etc.；Preferred, polyethers defoamer of the present invention.
8. a kind of non-dispersible underwater concrete additive as claimed in claim 1, it is characterised in that the air entraining agent is polyethers
One or more in air entraining agent, alkyl benzene sulfonate air entraining agent and modified triterpenoid saponin air entraining agent etc., the present invention are preferably poly-
Ether air entraining agent.
9. a kind of preparation method of non-dispersible underwater concrete additive, it is characterised in that its step is：Modified flocculant is molten
Liquid, polycarboxylate water-reducer, defoamer and air entraining agent are mixed evenly in proportion, you can it is additional to obtain non-dispersible underwater concrete
Agent.
10. a kind of non-dispersible underwater concrete additive, it is characterised in that may be directly applied to existing conventional underwater cast-in-place pile
In concrete, volume scope is the 1.5%~3% of binder materials quality.
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| CN201710882108.1A CN107500597A (en) | 2017-09-26 | 2017-09-26 | A kind of non-dispersible underwater concrete additive and preparation method thereof |
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| CN201710882108.1A CN107500597A (en) | 2017-09-26 | 2017-09-26 | A kind of non-dispersible underwater concrete additive and preparation method thereof |
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Family
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108178578A (en) * | 2018-01-17 | 2018-06-19 | 湖北恒利建材科技有限公司 | A kind of non-dispersible underwater concrete |
| CN114988756A (en) * | 2022-05-18 | 2022-09-02 | 江苏申御特种建材有限公司 | Underwater anti-dispersion expanding agent and preparation method thereof |
| CN115677262A (en) * | 2022-11-11 | 2023-02-03 | 科之杰新材料集团河南有限公司 | Adjuvant for underwater non-diffusion concrete and preparation method thereof |
| CN115677260A (en) * | 2022-10-18 | 2023-02-03 | 中建西部建设(广东)有限公司 | Additive for slow-setting type underwater undispersed concrete and preparation method thereof |
| CN116535127A (en) * | 2023-05-15 | 2023-08-04 | 北京建工新型建材有限责任公司 | Deflocculant concrete additive, preparation method and application thereof |
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| CN101519288A (en) * | 2009-04-03 | 2009-09-02 | 南京瑞迪高新技术公司 | Special additive for underwater undispersed shrinking-free grouting material |
| CN106946492A (en) * | 2017-03-01 | 2017-07-14 | 中建商品混凝土有限公司 | A kind of non-dispersible underwater concrete additive and preparation method thereof, application |
| CN107010892A (en) * | 2017-04-07 | 2017-08-04 | 俞家欢 | It is a kind of not disperse fast hard cement-base composite material of rapid hardening and its preparation method and application under water |
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| CN101519288A (en) * | 2009-04-03 | 2009-09-02 | 南京瑞迪高新技术公司 | Special additive for underwater undispersed shrinking-free grouting material |
| CN106946492A (en) * | 2017-03-01 | 2017-07-14 | 中建商品混凝土有限公司 | A kind of non-dispersible underwater concrete additive and preparation method thereof, application |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108178578A (en) * | 2018-01-17 | 2018-06-19 | 湖北恒利建材科技有限公司 | A kind of non-dispersible underwater concrete |
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| CN114988756A (en) * | 2022-05-18 | 2022-09-02 | 江苏申御特种建材有限公司 | Underwater anti-dispersion expanding agent and preparation method thereof |
| CN114988756B (en) * | 2022-05-18 | 2023-02-03 | 江苏申御特种建材有限公司 | Underwater anti-dispersion expanding agent and preparation method thereof |
| CN115677260A (en) * | 2022-10-18 | 2023-02-03 | 中建西部建设(广东)有限公司 | Additive for slow-setting type underwater undispersed concrete and preparation method thereof |
| CN115677262A (en) * | 2022-11-11 | 2023-02-03 | 科之杰新材料集团河南有限公司 | Adjuvant for underwater non-diffusion concrete and preparation method thereof |
| CN115677262B (en) * | 2022-11-11 | 2023-10-27 | 科之杰新材料集团河南有限公司 | Auxiliary agent for underwater non-diffusion concrete and preparation method thereof |
| CN116535127A (en) * | 2023-05-15 | 2023-08-04 | 北京建工新型建材有限责任公司 | Deflocculant concrete additive, preparation method and application thereof |
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Application publication date: 20171222 |
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