CN108558261A - A kind of additive and preparation method thereof inhibiting assembly concrete bleeding - Google Patents
A kind of additive and preparation method thereof inhibiting assembly concrete bleeding Download PDFInfo
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- CN108558261A CN108558261A CN201810448636.0A CN201810448636A CN108558261A CN 108558261 A CN108558261 A CN 108558261A CN 201810448636 A CN201810448636 A CN 201810448636A CN 108558261 A CN108558261 A CN 108558261A
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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
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08F283/00—Macromolecular compounds obtained by polymerising monomers on to polymers provided for in subclass C08G
- C08F283/06—Macromolecular compounds obtained by polymerising monomers on to polymers provided for in subclass C08G on to polyethers, polyoxymethylenes or polyacetals
- C08F283/065—Macromolecular compounds obtained by polymerising monomers on to polymers provided for in subclass C08G on to polyethers, polyoxymethylenes or polyacetals on to unsaturated polyethers, polyoxymethylenes or polyacetals
-
- 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
- C04B2103/00—Function or property of ingredients for mortars, concrete or artificial stone
- C04B2103/30—Water reducers, plasticisers, air-entrainers, flow improvers
- C04B2103/302—Water reducers
Abstract
The invention discloses a kind of additives and preparation method thereof inhibiting assembly concrete bleeding.The concrete admixture is made of following raw materials：150~250 parts of polycarboxylate component, 5~20 parts of bleeding conditioning agent, water are 730~845 parts.The present invention also provides the preparation methods of the concrete admixture, including processing step：1) bleeding conditioning agent is added to the water, stirs appropriate time, until bleeding conditioning agent dissolves, obtain clear solution；2) it is added polycarboxylate component into the solution, stirring appropriate time is to get to the concrete admixture.Concrete admixture prepared by the method for the present invention can prevent the lag bleeding of fresh concrete, ensure the exterior quality of assembly concrete component；The adaptability of the additive and cement is high simultaneously, and diminishing dispersibility is strong, is with a wide range of applications.
Description
Technical field
The invention belongs to technical field of concrete additives more particularly to it is a kind of inhibit assembly concrete bleeding it is additional
Agent and preparation method thereof.
Background technology
Development assembled architecture has become the state basic policy of Building Trade in China, and State Council has printed and distributed about greatly developing assembled
The notice of the instruction of building (Office of the State Council sends out (2016) No. 71).Opinion requires actively development prefabricated concrete structure.Firmly build
Portion is more distinctly claimed：To the year two thousand twenty, the ratio that national assembled architecture accounts for new building reaches 15% or more, cultivates 50 or more
Assembled architecture Model City, 200 or more assembled architecture industrial bases, 500 or more assembled architecture demonstration projects are built
If 30 or more assembled architecture science and technology innovation bases.In policy level, assembled architecture be thus lifted to one before institute not
Some height.
But the occupation rate of market of assembled architecture is very low at present, less than 1%, this is because assembled architecture is in material
Production, structure design and construction examination etc. are still limited by many technical barriers.
The construction material that assembled architecture uses is designed building block, wherein prefabricated concrete structure is one
The main building block of kind.It is main bearing member through assembly/connection that prefabricated concrete structure, which is using precast concrete,
Made of concrete structure.The quality of precast concrete directly affects the quality of prefabricated concrete structure, one of them
The surfacing of important quality requirements precast concrete is smooth, uniform color and corner angle are clearly demarcated, and this requires concrete
Mixture has good workability.Wherein, concrete mix does not occur the Con trolling index that excreting water phenomenon is most critical, because
Easily concrete disintegration is caused to be layered for bleeding, surface pores is more, water wave is mostly big with aberration, seriously affects the outer of concrete component
Quality is seen, the development of precast concrete is hindered.
When bleeding refers to that heavier solid component settles in concrete component, the water retention property of composition material is poor, causes portion
Water is divided to be flowed out from concrete mortar.The study found that the excreting water phenomenon of concrete can be divided into two kinds：Common bleeding and lag are secreted
Water.Common bleeding typically occurred in the short time (5min) after concrete mix mix；And lag bleeding refer to newly mix it is mixed
The original state for coagulating soil is fine, itself has good mobility, cohesiveness, protects plasticity, but 1~2 hour after pouring construction (or
Long period) in, there is apparent excreting water phenomenon in concrete, and lag bleeding mostly construct under cryogenic conditions in winter by ready-mixed concrete
When occur.
As the important guarantee of concrete quality, concrete admixture can significantly improve the excreting water phenomenon of concrete.Outside
The production and researcher for adding agent have carried out numerous studies, to solve the problems, such as the bleeding of concrete.Such as patent CN107383274A
In disclose a kind of concrete water-retaining agent, mainly by acrylamide, methacrylic acid and hydrophobic monomer (isobutyl
Ester or dimethylaminoethyl methacrylate) it is prepared by Raolical polymerizable, it is found from its open file, the water conservation
Agent mainly solves the common excreting water phenomenon of concrete.
Compared with common bleeding, the adverse effect bigger that lag bleeding generates is applied because the phenomenon that lag bleeding is happened at
1h or in the longer time after work, it is difficult to it finds in time, and the generation for lagging bleeding can make concrete surface layer laitance occur,
Quicksand and water wave are formed in component side simultaneously, seriously undermines the presentation quality of surface of concrete structure.
A kind of method of solution concrete lag bleeding is disclosed in patent CN103992057B, the research is by poly- carboxylic
Water-keeping material (polyvinyl alcohol, carboxymethyl cellulose, one kind in methylcellulose) and sodium sulphate are compounded in sour water-reducing agent, with suppression
The lag bleeding of concrete processed mainly stresses the lag after solution concrete mix 1h from discovery this method in its open file
Excreting water phenomenon does not make a search to the bleeding situation after the concrete mix long period, and fresh concrete is (general before initial set
8-9h after mix) any time there is excreting water phenomenon, will all influence the exterior quality after concrete form removal.
To solve the problems, such as the bleeding of concrete, excreting water phenomenon is especially lagged, ensures the appearance product of precast concrete
Matter researches and develops a kind of additive inhibiting assembly concrete bleeding, it appears particularly important.
Invention content
The purpose of the present invention is to provide a kind of additives inhibiting assembly concrete bleeding, to prevent concrete lag
The appearance of excreting water phenomenon ensures the presentation quality of assembly concrete component.
It is a further object of the present invention to provide a kind of preparation methods of the additive of above-mentioned inhibition assembly concrete bleeding.
Based on this Research Thinking, technical scheme is as follows：
A kind of additive inhibiting assembly concrete bleeding, is made of the raw material of following mass fractions (parts by weight)
's：
150~250 parts of polycarboxylate component, 5~20 parts of bleeding conditioning agent, water are 730~845 parts；
The polycarboxylate component is by allyl polyethenoxy ether, acrylic acid, N- (3- dimethylamino-propyls) methacryl
The monomers such as amine are made through free radicals copolymerization reaction；Wherein, allyl polyethenoxy ether, acrylic acid, N- (3- dimethylamino-propyls)
Mass fraction ratio between Methacrylamide, initiator, chain-transferring agent, water each component is 100：(3~10)：(1~3)：
(0.1~0.5)：(0.5~0.25)：(120~180).Temperature when reaction is 40~65 DEG C, more preferably 45~60 DEG C.
Furthermore, the mass concentration of polycarboxylate component is preferably 35%~50%, and more preferably 35%~45%；It is poly-
The mass fraction of carboxyl acid component is preferably 150~250, and more preferably 150~200.
The bleeding conditioning agent is a kind of or above times in two water zinc acetates, zinc nitrate hexahydrate, white vitriol
Meaning ratio combines.
Furthermore, the bleeding conditioning agent is preferably two water zinc acetates, zinc nitrate hexahydrate, white vitriol, more excellent
It is selected as zinc nitrate hexahydrate and white vitriol；The mass fraction of the bleeding conditioning agent is preferably 5~20 parts, more preferably 5~
10 parts；The mass fraction of water is preferably 730~845, and more preferably 800~845.
In addition, the preparation method of above-mentioned inhibition assembly concrete bleeding additive includes the following steps：
1) suitable bleeding conditioning agent is added to the water, stirs appropriate time, until bleeding conditioning agent dissolves, obtained transparent
Solution；Mixing time is preferably 0.5~3h；More preferably 0.5~1h.
2) suitable polycarboxylate component is added into the solution again, stirring appropriate time is to get additional to the concrete
Agent；Mixing time is preferably 0.5~3h, more preferably 0.5~1h.
Furthermore, the preparation method of the polycarboxylic acids diminishing component includes the following steps：
1) allyl polyethenoxy ether is soluble in water, wiring solution-forming A, mass concentration is preferably 45~75%, more excellent
It is selected as 55~70%；The molecular weight of the allyl polyethenoxy ether is preferably 3000~5000, and more preferably 3500~4500；
2) acrylic acid and N- (3- dimethylamino-propyls) Methacrylamide is soluble in water, wiring solution-forming B, quality is dense
Degree preferably 55~75%, more preferably 60~70%；
3) reduction components in chain-transferring agent and initiator are soluble in water, wiring solution-forming C, mass concentration is preferably
1.0~4.0%, more preferably 1.5~2.5%；The chain-transferring agent is preferably thioacetic acid and mercaptopropionic acid；The initiator
For redox initiation system, preferably L-AA/hydrogen peroxide and sodium hydrogensulfite/ammonium persulfate system, reduction
Ingredient is preferably L-AA and bisulfite.
4) solution A is warming up to setting reaction temperature, the oxidation component in initiation system is added in A, oxidation component
Then solution B and C are added drop-wise in different time in A by preferably hydrogen peroxide and ammonium persulfate, wait for all being added dropwise
Afterwards, it is further continued for reaction a period of time, reacting liquid temperature is then down to room temperature, pH value is adjusted with lye, is diluted with water, is fitted
Suitable mass concentration, mass concentration are preferably 35%~50%, and more preferably 35%~45% to get to used herein
Polycarboxylate component.
Furthermore, in step 2), the time for adding of solution B is preferably 2~4h, more preferably 3~4h；
Furthermore, in step 3), the time for adding of solution C is preferably 2.5~5.5h, more preferably 3~4.5h；Drop
It is preferably 0.5~2.0h to add the continuation reaction time after finishing, more preferably 0.5~1.5h.
Furthermore, in step 4), lye is preferably sodium hydroxide solution, and mass concentration is preferably 10~45%,
More preferably 25~35%；PH value is preferably 4~7, and more preferably 5.5~6.5.
Compared with prior art, the invention has the advantages that：
1) concrete admixture prepared by the method for the present invention can inhibit the bleeding of fresh concrete, especially environment temperature
Lag bleeding when relatively low, and can prevent to lag bleeding before fresh concrete initial set, ensure assembly concrete component
Exterior quality.
2) adaptability of concrete admixture and cement of the present invention is smaller by the qualitative effects of cement, can prevent
The lag bleeding of different cement mixing concrete.
3) concrete admixture prepared by the method for the present invention not only has higher cement dispersibility, more can be to avoid new
The lag bleeding of mixed concrete, its volume is low when use, and adaptability is high, is with a wide range of applications.
Specific implementation mode
The present invention inhibits the additive of assembly concrete bleeding, to prevent the appearance that concrete lags excreting water phenomenon, protects
Demonstrate,prove the presentation quality of assembly concrete component.
A large number of experiments is studies have shown that the hydration rate of cement is influenced by environment temperature, when the temperature of the surroundings is low, cement
Hydration rate reduce, setting time extend.Under normal conditions, the polycarboxylic acids molecule being added in fresh concrete can be by cement water
Change product package and gradually uses up.But when the temperature of the surroundings is low, hydrated cementitious is slack-off in fresh concrete, hydrated product compared with
Few, polycarboxylic acids molecule retention time can extend in mixture.Since polycarboxylic acids molecule persistently plays its dispersion energy to cement
Power, the Free water in mixture are gradually precipitated, and form lag bleeding.
Applicants have found that by the polyether group of higher molecular weight and the synergistic effect of amine groups, can utilize
Polycarboxylic acids molecule accelerates hydration rate of the cement when temperature is relatively low.Polyether monomer and amine-containing monomers are advanced optimized, it can be with
Adjust the generating rate of hydrolysis product of cement, it is ensured that polycarboxylic acids molecule is gradually wrapped up by hydrated product and loses diminishing and disperse energy
Power, and then inhibit the precipitation of Free water, prevent lag excreting water phenomenon.
Easily fresh concrete is caused to lag applicants have found that the adaptability of polycarboxylic acids molecule and cement is poor
Excreting water phenomenon.Each kind Cement Quality difference is larger, such as the mineral Phase Proportion of clinker in cement, in cement the kind of admixture and
Quality discrepancy etc., this increases difficulty to the adaptability of polycarboxylic acids molecule and cement with specific structure.It is secreted to prevent lag
Water weakens the influence of polycarboxylic acids molecule and cement adaptability, and the present invention has developed bleeding conditioning agent, and bleeding conditioning agent has water
Stronger complexing power can adsorb the Free water discharged by polycarboxylic acids molecular dispersion.
Based on this Research Thinking, technical scheme is as follows：
A kind of additive inhibiting assembly concrete bleeding, its technical solution is that it is by following mass fractions (weight
Measure number) raw material made of：150~250 parts of polycarboxylate component, 5~20 parts of bleeding conditioning agent, water are 730~845 parts；It is poly-
Carboxyl acid component is by allyl polyethenoxy ether, and acrylic acid, the monomers such as N- (3- dimethylamino-propyls) Methacrylamide are through freedom
Base copolyreaction be made, wherein allyl polyethenoxy ether, acrylic acid, N- (3- dimethylamino-propyls) Methacrylamide, draw
It is 100 to send out the mass fraction ratio between agent, chain-transferring agent, water each component：(3~10)：(1~3)：(0.1~0.5)：(0.5~
0.25)：(120~180)；Bleeding conditioning agent is one or any in two water zinc acetates, zinc nitrate hexahydrate, white vitriol
Ratio combines.
For the sake of becoming apparent from, the present invention is made below by preferred embodiment combination effete test embodiment in detail below further
It is described in detail, but the present invention is not limited in embodiment below.
Embodiment 1
A kind of preparation method of polycarboxylic acids diminishing component includes the following steps：
1) the allyl polyethenoxy ether 160g that molecular weight is 3500 is dissolved in 100g water, wiring solution-forming A；
2) acrylic acid 13g and N- (3- dimethylamino-propyls) Methacrylamide 3.3g is dissolved in 8g water, wiring solution-forming
B；
3) mercaptopropionic acid 0.6g and L-AA 0.3g are dissolved in 45g water, wiring solution-forming C；
4) solution A is warming up to 50 DEG C, hydrogen peroxidase 10 .45g is added in A, be then added drop-wise to solution B and C simultaneously
In A, the time for adding of solution B is 3.0h, and the time for adding of solution C is 3.5h；
After being all added dropwise, it is further continued for reaction 1h, reacting liquid temperature is then down to room temperature, uses sodium hydroxide solution
The pH value that (30wt%) 20g adjusts reaction solution is 6.0, then adds water 109g, obtains the polycarboxylate component that mass concentration is 40%.
The additive for including the inhibition assembly concrete bleeding of above-mentioned polycarboxylic acids diminishing component, is by following mass parts
Several raw materials are made：200 parts of polycarboxylate component, 5 parts of bleeding conditioning agent zinc nitrate hexahydrate, water are 795 parts；
Zinc nitrate hexahydrate 5.0g is added in 795g water, 0.5h is stirred, obtains clear solution；System is added into the solution again
Standby polycarboxylate component 200g, stirring 0.5h is to get to the concrete admixture.
Embodiment 2
A kind of preparation method of polycarboxylic acids diminishing component includes the following steps：
1) the allyl polyethenoxy ether 182g that molecular weight is 4000 is dissolved in 120g water, wiring solution-forming A；
2) acrylic acid 13g and N- (3- dimethylamino-propyls) Methacrylamide 3.3g is dissolved in 8g water, wiring solution-forming
B；
3) mercaptopropionic acid 0.6g and L-AA 0.3g are dissolved in 45g water, wiring solution-forming C；
4) solution A is warming up to 50 DEG C, hydrogen peroxidase 10 .45g is added in A, be then added drop-wise to solution B and C simultaneously
In A, the time for adding of solution B is 3.0h, and the time for adding of solution C is 3.5h；
After being all added dropwise, it is further continued for reaction 1h, reacting liquid temperature is then down to room temperature, uses sodium hydroxide solution
The pH value that (30wt%) 20g adjusts reaction solution is 6.0, then adds water 122g, obtains the polycarboxylate component that mass concentration is 40%.
The additive for including the inhibition assembly concrete bleeding of above-mentioned polycarboxylic acids diminishing component, is by following mass parts
Several raw materials are made：200 parts of polycarboxylate component, 10 parts of bleeding conditioning agent white vitriol, water are 790 parts；
White vitriol 10g is added in 790g water, 0.5h is stirred, obtains clear solution；System is added into the solution again
Standby polycarboxylate component 200g, stirring 0.5h is to get to the concrete admixture.
Embodiment 3
A kind of preparation method of polycarboxylic acids diminishing component includes the following steps：
1) the allyl polyethenoxy ether 182g that molecular weight is 4000 is dissolved in 120g water, wiring solution-forming A；
2) acrylic acid 13g and N- (3- dimethylamino-propyls) Methacrylamide 5.0g is dissolved in 10g water, wiring solution-forming
B；
3) mercaptopropionic acid 0.6g and L-AA 0.3g are dissolved in 45g water, wiring solution-forming C；
4) solution A is warming up to 50 DEG C, hydrogen peroxidase 10 .45g is added in A, be then added drop-wise to solution B and C simultaneously
In A, the time for adding of solution B is 3.0h, and the time for adding of solution C is 3.5h；
After being all added dropwise, it is further continued for reaction 1h, reacting liquid temperature is then down to room temperature, uses sodium hydroxide solution
The pH value that (30wt%) 20g adjusts reaction solution is 6.0, then adds water 122g, obtains the polycarboxylate component that mass concentration is 40%.
The additive for including the inhibition assembly concrete bleeding of above-mentioned polycarboxylic acids diminishing component, is by following mass parts
Several raw materials are made：200 parts of polycarboxylate component, 10 parts of bleeding conditioning agent white vitriol, water are 790 parts；
White vitriol 10g is added in 790g water, 0.5h is stirred, obtains clear solution；System is added into the solution again
Standby polycarboxylate component 200g, stirring 0.5h is to get to the concrete admixture.
Embodiment 4
A kind of preparation method of polycarboxylic acids diminishing component includes the following steps：
1) the allyl polyethenoxy ether 182g that molecular weight is 4000 is dissolved in 120g water, wiring solution-forming A；
2) acrylic acid 13g and N- (3- dimethylamino-propyls) Methacrylamide 3.3g is dissolved in 8g water, wiring solution-forming
B；
3) mercaptopropionic acid 0.6g and L-AA 0.3g are dissolved in 45g water, wiring solution-forming C；
4) solution A is warming up to 50 DEG C, hydrogen peroxidase 10 .45g is added in A, be then added drop-wise to solution B and C simultaneously
In A, the time for adding of solution B is 3.0h, and the time for adding of solution C is 3.5h；
After being all added dropwise, it is further continued for reaction 1h, reacting liquid temperature is then down to room temperature, uses sodium hydroxide solution
The pH value that (30wt%) 20g adjusts reaction solution is 6.0, then adds water 122g, obtains the polycarboxylate component that mass concentration is 40%.
The additive for including the inhibition assembly concrete bleeding of above-mentioned polycarboxylic acids diminishing component, is by following mass parts
Several raw materials are made：200 parts of polycarboxylate component, 15 parts of bleeding conditioning agent white vitriol, water are 785 parts；
White vitriol (15g) is added in 785g water, 0.5h is stirred, obtains clear solution；It is added again into the solution
The polycarboxylate component 200g of preparation, stirring 0.5h is to get to the concrete admixture.
Embodiment 5
A kind of preparation method of polycarboxylic acids diminishing component includes the following steps：
1) the allyl polyethenoxy ether 182g that molecular weight is 4000 is dissolved in 120g water, wiring solution-forming A；
2) acrylic acid 13g and N- (3- dimethylamino-propyls) Methacrylamide 3.3g is dissolved in 8g water, wiring solution-forming
B；
3) mercaptopropionic acid 0.6g and L-AA 0.3g are dissolved in 45g water, wiring solution-forming C；
4) solution A is warming up to 50 DEG C, hydrogen peroxidase 10 .45g is added in A, be then added drop-wise to solution B and C simultaneously
In A, the time for adding of solution B is 3.0h, and the time for adding of solution C is 3.5h；
After being all added dropwise, it is further continued for reaction 1h, reacting liquid temperature is then down to room temperature, uses sodium hydroxide solution
The pH value that (30wt%) 20g adjusts reaction solution is 6.0, then adds water 122g, obtains the polycarboxylate component that mass concentration is 40%.
The additive for including the inhibition assembly concrete bleeding of above-mentioned polycarboxylic acids diminishing component, is by following mass parts
Several raw materials are made：200 parts of polycarboxylate component, 20 parts of bleeding conditioning agent zinc nitrate hexahydrate, water are 780 parts；
Zinc nitrate hexahydrate 20g is added in 780g water, 0.5h is stirred, obtains clear solution；System is added into the solution again
Standby polycarboxylate component 200g, stirring 0.5h is to get to the concrete admixture.
Comparative example 1
The allyl polyethenoxy ether (109g) that molecular weight is 2400 is dissolved in 72g water, wiring solution-forming (A)；
Acrylic acid (13g) is dissolved in 10g water, wiring solution-forming (B)；By mercaptopropionic acid (0.6g) and L-AA
(0.3g) is dissolved in 45g water, wiring solution-forming (C)；
Solution (A) is warming up to 50 DEG C, hydrogen peroxide (0.45g) is added in (A), it is then that solution (B) and (C) is same
When be added drop-wise in (A), the time for adding of solution (B) is 3.0h, and the time for adding of solution (C) is 3.5h；
After being all added dropwise, it is further continued for reaction 1h, reacting liquid temperature is then down to room temperature, uses sodium hydroxide solution
The pH value that (30wt%) 20g adjusts reaction solution is 6.0, then adds water 53g, obtains the polycarboxylate component that mass concentration is 40%.
The polycarboxylate component (200g) of preparation is added in 800g water, 0.5h is stirred, obtains clear solution as a comparison case.
Comparative example 2
The allyl polyethenoxy ether (109g) that molecular weight is 2400 is dissolved in 72g water, wiring solution-forming (A)；
Acrylic acid (13g) is dissolved in 10g water, wiring solution-forming (B)；By mercaptopropionic acid (0.6g) and L-AA
(0.3g) is dissolved in 45g water, wiring solution-forming (C)；Solution (A) is warming up to 50 DEG C, hydrogen peroxide (0.45g) is added to (A)
In, it then by solution (B) and (C) while being added drop-wise in (A), the time for adding of solution (B) is 3.0h, when the dropwise addition of solution (C)
Between be 3.5h；
After being all added dropwise, it is further continued for reaction 1h, reacting liquid temperature is then down to room temperature, uses sodium hydroxide solution
The pH value that (30wt%) 20g adjusts reaction solution is 6.0, then adds water 53g, obtains the polycarboxylate component that mass concentration is 40%.
White vitriol (15g) is added in 785g water, 0.5h is stirred, obtains clear solution；It is added again into the solution
The polycarboxylate component (200g) of preparation, stirring 0.5h is to get to the concrete admixture.
It is effete test embodiment content below.
Effete test embodiment
Foundation《Concrete admixture》In (GB 8076-2008) bleeding rate than assay method, measure using embodiment and
The bleeding gross mass for fresh concrete different time before concrete initial set that concrete admixture is prepared in comparative example.
According to the requirement of assembled ready-mixed concrete structure, the concrete includes the component of following parts by weight：
9.0 parts of 360 parts of cement, 80 parts of flyash, 720 parts of sand, 1060 parts of stone, 140 parts of water and concrete admixture.Institute
It is conch (pure and fresh) Cement Co., Ltd, China Resources (envelope that the cement stated, which uses Portland cement (PO 425R), manufacturer,
Open) Cement Co., Ltd, platform mud (Germany and Britain) Co., Ltd, Guangdong Hong Feng Cement Co., Ltds and the limited public affairs of Guangzhou Zhujiang River cement
Department；The flyash is the II grade flyash of Guangzhou Wang Long power plant production.
The bleeding gross mass of 1 embodiment of table, 1 concrete batching
The bleeding gross mass of 2 embodiment of table, 2 concrete batching
The bleeding gross mass of 3 embodiment of table, 3 concrete batching
The bleeding gross mass of 4 embodiment of table, 4 concrete batching
The bleeding gross mass of 5 embodiment of table, 5 concrete batching
The bleeding gross mass of 6 comparative example of table, 1 concrete batching
The bleeding gross mass of 7 comparative example of table, 2 concrete batching
Note：The volume of concrete is about 5.0L in experiment, and the presetting period is about 9.0h.
By with the bleeding quantity data after fresh concrete mixing different time in upper table 1-5 it can be found that with comparative example 1-2
It compares, the concrete that embodiment 1-5 prepares concrete admixture preparation is greatly reduced in the bleeding quantity of different time.
By taking the cement of China Resources as an example, when comparative example 1, the bleeding gross mass of fresh concrete is 21.6g, and is mixed in concrete
Still there is excreting water phenomenon in 3h after system；And use concrete admixture concrete batching bleeding quantity prepared by the method for the present invention substantially
Degree is reduced, and when such as embodiment 4, the bleeding gross mass of fresh concrete is only 1.5g, without secreting after concrete mixing 2h
Water, fresh concrete keep good workability.
These statistics indicate that, concrete admixture prepared by the method for the present invention can inhibit the bleeding of concrete, especially
Lag excreting water phenomenon after mixing 2h.
When using different cement, the excreting water phenomenon difference of fresh concrete is larger, compared with other cement, great abundance of water mud
Excreting water phenomenon it is the most serious, when such as comparative example 1, the bleeding gross mass of fresh concrete reaches 99.2g, and after mixing 4h
Still there is excreting water phenomenon；When embodiment 5, bleeding quantity is reduced to 8.6g, does not have bleeding, fresh concrete to protect after mixing 2h
Hold good plasticity.This shows when the quality of cement fluctuates, and concrete admixture prepared by the method for the present invention still can be with
Inhibit the bleeding of concrete, the lag excreting water phenomenon after especially mixing 2h.
When using great abundance of water mud, compared with comparative example 1, when comparative example 2, the bleeding gross mass of fresh concrete reaches
60.2g, bleeding quantity substantially reduce, and are also significantly reduced in bleeding quantity in different time periods.This further demonstrates that bleeding is adjusted
Agent can improve the adaptability of concrete admixture and cement, and enhancing fresh concrete inhibits the ability of bleeding.
The above described is only a preferred embodiment of the present invention, be not intended to limit the present invention in any form, therefore
It is every without departing from technical solution of the present invention content, simply repaiied to any made by above example according to the technical essence of the invention
Change, equivalent variations and modification, in the range of still falling within technical solution of the present invention.
Claims (7)
1. a kind of additive inhibiting assembly concrete bleeding, which is characterized in that the additive is by following mass fractions
Made of raw material：
150~250 parts of polycarboxylate component, 5~20 parts of bleeding conditioning agent, water are 730~845 parts；
Preparation method comprises the technical steps that：
1) bleeding conditioning agent is added to the water, stirs appropriate time, until bleeding conditioning agent dissolves, obtain clear solution；
2) it is added polycarboxylate component into the solution, stirring appropriate time is to get to the concrete admixture.
2. the additive according to claim 1 for inhibiting assembly concrete bleeding, it is characterised in that：The polycarboxylic acids group
Point it is by the polycarboxylate component by allyl polyethenoxy ether, acrylic acid, N- (3- dimethylamino-propyls) Methacrylamide
Equal monomers are made through free radicals copolymerization reaction；Wherein, allyl polyethenoxy ether, acrylic acid, N- (3- dimethylamino-propyls) first
Base acrylamide, initiator, chain-transferring agent and water press 100：(3~10)：(1~3)：(0.1~0.5)：(0.5~0.25)：
The quality parts ratio of (120~180) is made；Reaction temperature is 40~65 DEG C, preferably 45~60 DEG C.
3. the additive according to claim 1 for inhibiting assembly concrete bleeding, it is characterised in that：The polycarboxylic acids subtracts
The preparation method of water component includes the following steps：
1) allyl polyethenoxy ether is soluble in water, wiring solution-forming A, mass concentration be 45~75%, preferably 55~
70%；
2) acrylic acid and N- (3- dimethylamino-propyls) Methacrylamide is soluble in water, wiring solution-forming B, mass concentration is
55~75%, preferably 60~70%；
3) reduction components in chain-transferring agent and initiator are soluble in water, wiring solution-forming C, mass concentration be 1.0~
4.0%, preferably 1.5~2.5%；
4) solution A is warming up to setting reaction temperature, the oxidation component in initiation system is added in A, oxidation component is preferred
For hydrogen peroxide and ammonium persulfate, then solution B and C are added drop-wise in different time in A, after being all added dropwise, then
The reaction was continued a period of time, and reacting liquid temperature is then down to room temperature, adjusts pH value with lye, is diluted with water, it is suitable to obtain
Mass concentration is to get to polycarboxylate component used in the present invention.
4. the preparation method of the additive of inhibition assembly concrete bleeding according to claim 3, it is characterised in that：
In step 1), the molecular weight of the allyl polyethenoxy ether is 3000~5000, preferably 3500~4500；
In step 3), the chain-transferring agent is preferably thioacetic acid and mercaptopropionic acid；The initiator is Redox Initiator body
System, is L-AA/hydrogen peroxide and sodium hydrogensulfite/ammonium persulfate system, reducing component are respectively L-AA
And bisulfite；
In step 4), the time for adding of solution B is 2~4h, preferably 3~4h；The time for adding of solution C is 2.5~5.5h, excellent
It is selected as 3~4.5h；It is 0.5~2.0h, preferably 0.5~1.5h to continue the reaction time after being added dropwise；Lye is preferably hydrogen-oxygen
Change sodium solution, mass concentration is 10~45%, preferably 25~35%；PH value is 4~7, preferably 5.5~6.5.
5. the additive according to claim 1 for inhibiting assembly concrete bleeding, it is characterised in that：The polycarboxylic acids group
The mass concentration divided is 35%~50%, preferably 35%~45%.
6. the additive according to claim 1 for inhibiting assembly concrete bleeding, it is characterised in that：The bleeding is adjusted
Agent is a kind of or above arbitrary proportion combination in two water zinc acetates, zinc nitrate hexahydrate, white vitriol.
7. the additive according to claim 1 for inhibiting assembly concrete bleeding, it is characterised in that：
In step 1), the mixing time is 0.5~3h, preferably 0.5~1h；
In step 2), the mixing time is 0.5~3h, preferably 0.5~1h.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112694277A (en) * | 2020-12-24 | 2021-04-23 | 广州市建筑科学研究院有限公司 | High-adaptability polycarboxylate superplasticizer and preparation method thereof |
| CN113321456A (en) * | 2021-06-28 | 2021-08-31 | 深圳市东大洋水泥制品有限公司 | Anti-crack concrete and preparation method thereof |
| CN116535131A (en) * | 2023-04-23 | 2023-08-04 | 惠州森洛克材料科技有限公司 | Additive auxiliary agent for producing low-carbon commodity concrete |
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| CN113321456A (en) * | 2021-06-28 | 2021-08-31 | 深圳市东大洋水泥制品有限公司 | Anti-crack concrete and preparation method thereof |
| CN116535131A (en) * | 2023-04-23 | 2023-08-04 | 惠州森洛克材料科技有限公司 | Additive auxiliary agent for producing low-carbon commodity concrete |
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| CN108558261B (en) | 2020-12-25 |
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