CN108623741A - A kind of organic low alkali accelerator of formation inierpeneirating network structure and preparation method thereof - Google Patents
A kind of organic low alkali accelerator of formation inierpeneirating network structure and preparation method thereof Download PDFInfo
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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
- C08F220/00—Copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and only one being terminated by only one carboxyl radical or a salt, anhydride ester, amide, imide or nitrile thereof
- C08F220/02—Monocarboxylic acids having less than ten carbon atoms; Derivatives thereof
- C08F220/52—Amides or imides
- C08F220/54—Amides, e.g. N,N-dimethylacrylamide or N-isopropylacrylamide
- C08F220/56—Acrylamide; Methacrylamide
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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
- C04B24/00—Use of organic materials as active ingredients for mortars, concrete or artificial stone, e.g. plasticisers
- C04B24/24—Macromolecular compounds
- C04B24/26—Macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds
- C04B24/2641—Polyacrylates; Polymethacrylates
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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
- C04B24/00—Use of organic materials as active ingredients for mortars, concrete or artificial stone, e.g. plasticisers
- C04B24/24—Macromolecular compounds
- C04B24/26—Macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds
- C04B24/2652—Nitrogen containing polymers, e.g. polyacrylamides, polyacrylonitriles
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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
- C08F220/00—Copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and only one being terminated by only one carboxyl radical or a salt, anhydride ester, amide, imide or nitrile thereof
- C08F220/02—Monocarboxylic acids having less than ten carbon atoms; Derivatives thereof
- C08F220/04—Acids; Metal salts or ammonium salts thereof
- C08F220/06—Acrylic acid; Methacrylic acid; Metal salts or ammonium salts thereof
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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
- C04B2103/00—Function or property of ingredients for mortars, concrete or artificial stone
- C04B2103/10—Accelerators; Activators
- C04B2103/12—Set accelerators
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- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Organic Chemistry (AREA)
- Materials Engineering (AREA)
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Abstract
The present invention is a kind of low alkali accelerator of formation inierpeneirating network structure liquid, and the hydrated product formed using hydrated cementitious is formed inierpeneirating network structure with high molecular polymer and reaches rapid hardening effect.This accelerator is grouped as by the group of following weight part ratio：5 13 parts of polymer monomer, 0.3 0.8 parts of crosslinking agent, 1 1.7 parts of initiator, 0.5 1.5 parts of catalyst, 80 85 parts of water.Accelerator condensation has many advantages, such as that the time is adjustable, good for environmental change and raw materials variations tolerance, good with different types of cement adaptability, either mixed in a manner of aqueous solution, or stirring is added water after first mixing mix with pulvis, the rapid hardening characteristic that inierpeneirating network structure is quickly formed can be played.This organic-inorganic inierpeneirating network structure is also obviously improved the toughness of cement-based material, is mainly manifested in crack resistance raising, flexural strength increases.Add the initial set of this accelerator cement, final setting time, 28 days compression strength are satisfied by the requirement of national standard, good with water-reducing agent adaptability.
Description
Technical field
The present invention is a kind of low alkali accelerator of gunite concrete liquid, belongs to building material field.
Background technology
Gunite concrete have been widely used in Tunnel Engineering, underground engineering, hydraulic tunnel, bank protection supporting, water conservancy and hydropower,
The fields such as mine tunnel and engineering repairing.Accelerator is essential additive in gunite concrete, and major function is to add
The condensation setting rate of fast gunite concrete, reduces rebound loss, prevents gunite concrete because gravity causes to fall off, and increases primary
Jet thickness and the interval time for shortening injection interlayer.
The development experience of accelerator powdered overbased, the low alkali of powdery, liquid is high-alkali, the low alkali of liquid, alkali-free liquid, organic
The development course of inorganic compounding accelerator, alkali-free liquid setting accelerator are the research and development directions in accelerator product future.
Powdered overbased accelerator is mainly by raw materials such as lime, industrial sodium aluminate, alkali carbonate and silicates through forging
Grinding is burnt to form.China has developed a variety of powdery rapid hardenings such as 1 type of Yangquan, 711 types, 782 types since 1 type accelerator of Red Star
Agent.The late strength of concrete loss up to 30% of this kind of accelerator is mixed, but its rapid hardening effect is good, early strength function is apparent, volume
It is low with production cost, it is widely used in construction of shotcrete at home.To avoid, the high-alkali accelerator corrosivity of powdery is strong, the later stage
The problems such as loss of strength is big, novel alkali-free powder accelerator have gradually developed.It is developed from 20th century the nineties in China
The alkali-frees powder accelerators such as AC types, MJ-2000 types.CN102992685A invention one kind is by aluminum sulfate, sodium aluminate, lithium carbonate, nothing
The powder state accelerator of the calcium aluminium silicate cementitious material of amorphous silicon dioxide, naphthalenesulfonate formaldehyde condensation compound composition, not chloride containing
Object and fluoride are small to the potential corrosion harmfulness of reinforcement in concrete, ensure that the safety of job site personnel.
CN102964076A has invented a kind of chlorine-free alkali-free accelerator formed with gypsum, aluminum sulfate, sulphoaluminate cement clinker, can be with
While promoting hydrated cementitious, early stage or the later strength of concrete are not reduced.But novel alkali-free powder accelerator and organic
Although inorganic compounding class accelerator has the advantages that later strength loss is small, and dust is small in production and construction, but they will reach
The suitable volume for being satisfied with rapid hardening effect is generally bigger than traditional accelerator.
As wet spraying technology develops and applies, the direction of accelerator research and development also turns to liquid accelerator, China therewith
From the low-alkali liquid quick-setting agent that begins one's study at the end of the 20th century.The liquid accelerator main component of beginning is alkali metal aluminate and organic
Reinforced phase, such as HL-801 types, GK type liquid accelerators.The research direction of liquid accelerator is to reduce alkali content, improve and mix later
Solidifying soil later strength, raw materials used kind also begin to diversification.Using water glass type and aluminic acid sodium form as the high-alkali liquid of representative
Accelerator has certain adverse effect, rebound of shotcrete rate high late strength of concrete；While alkaline liquid accelerating agent
Deteriorate construction environment, corrosion field type facility using that can bring, influence constructor's health and generate alkali, reduces durable
The negative effects such as property.There is small 28d losss of strength, alkali-free chlorine-free, safety by nothing (low) alkali accelerator of representative of sulfuric acid aluminium profiles
The advantages that environmental protection and high-durability；But it is big, unstable with cement and other additives and working environment adaptability that there is also volumes
The fixed, problems to be solved such as accelerated clotting time is unstable.In addition alkali-free liquid accelerator can be deposited in the form of dispersion or solution
To reach the content for first having to ensure dispersion high active substance for promoting to gaze fixedly at, the stability of secondary guarantee solution makes
The accelerator ingredient that must be dissolved does not precipitate, crystallizes or is formed gel.
US8075688132 invents a kind of liquid making stabilizer with aluminium oxide, sulfuric acid, fluoride, magnesium silicate or kaolin
Accelerator can preferably disperse in mixed mud, promote condensation.A kind of liquid accelerator of EP0946451B1 inventions, with hydrogen-oxygen
Changing aluminium, aluminium salt and organic carboxyl acid liquid accelerator as main component can more easily be mixed into concrete, but this kind of speed
Solidifying agent is unstable in the solution.Diethanol amine is added in AU2010227009A1 on this basis, Ludox each serves as promotion stream
Effect that is dynamic and stablizing.US9242904B2 has invented a kind of diversified forms (liquid, solid-state or powder) polymer vinyl acetate
Ester or its copolymer-modified aluminium salt, aluminate, alkali silicate accelerator, to reach multiple polymers and accelerator ingredient
Simultaneous Stabilization exists in the solution.EP0812812B1 discloses the alkali-free accelerator dispersant with high active substance content, makes
With aluminum sulfate and at least one alkanolamine and inorganic stabilizers magnesium silicate, avoids addition acid or alkanes are easy exudation contaminant water
The material of body, but early strength still needs to improve.US20160023950A1 has invented a kind of aluminum sulfate, diethanol amine, hydroxide
Aluminium, carboxylic acid, magnesium silicate stabilizer accelerator as main component can also reach preferable rapid hardening effect.It is thin in gunite concrete
The ratio of aggregate is big, causes the probability of alkali-aggregate reaction very high, has the risk for generating crack after hardening, mixed to compromise
The durability for coagulating soil, using will not lead to alkali polymerisation or be very difficult to avoid completely this using the aggregate of low alkali formula cement and ask
Topic.US7662230B2 invented a kind of aluminum sulfate and hydrofluoric acid, aluminium hydroxide and one or more lithium salts (hydroxide of lithium,
Lithium carbonate and lithium sulfate) composition liquid accelerator, setting time meets the requirements outer with influence to intensity, has low temperature storage
Hide stability and the inhibiting effect to alkali-aggregate reaction.
The above accelerator is all to reach rapid hardening effect by changing cement hydration process, and the present invention is by interpenetrating networks original
Reason, organic polymer monomer are incorporated inside cement slurry, are excited under the action of initiator, and autohemagglutination generates backbone；By
In the presence of crosslinking agent, macromolecular chain is crosslinked with chain, forms the network structure of build, and forming polymer mesh structure makes
Jelling time shortens；Later stage cement continues aquation and solidifies to form inierpeneirating network structure and achieve the effect that enhancing.In organic matter
Active group and hydrated product chemical bond and effect occurs, improve the combination between hydrated product interface, improve anti-folding
Intensity；The macromolecular chain of generation has thickening and reducing dust and decreasing resilience and other effects simultaneously；Such accelerator is suitable with a variety of high efficiency water reducing agents
Answering property is good.
Invention content
The present invention is a kind of high-efficiency environment friendly, good with various cement adaptabilities, is formed mutually by polymerisation and cement
Network structure is worn to improve the organic polymer accelerator of gunite concrete toughness.
The present invention adopts the following technical scheme that in order to achieve the above objectives：
A kind of low alkali accelerator of new liquid, in terms of parts by weight, the raw material for preparing of the accelerator includes：
The polymer monomer is acrylamide or n-isopropyl acrylamide, Methacrylamide, acrylic acid；It is described
Crosslinking agent be N,N methylene bis acrylamide, N hydroxymethyl acrylamide, Methacrylamide.The redox is compound
The initiator and catalyst compatibility of initiation system are hydrogen peroxide-ferrous iron salt, persulfate-ferrous iron salt, persulfate-Asia
Sulfates, reducing agent are sulphite, rongalite, thiosulfate, N, N, N ', N '-tetramethylethylenediamines, VC.
The acrylamide is molecular formula C3H5NO, molecular weight 71.08.The n-isopropyl acrylamide molecular formula
C6H11NO, molecular weight 113.16.Methacrylamide molecular formula is C4H7NO, molecular weight 85.1.Acrylic molecules formula is
C3H4O2, molecular weight 72.06.N,N methylene bis acrylamide molecular formula is C7H10N2O2, molecular weight 154.17.N- methylols
Acrylamide structural formula CH2=CHCONHCH2OH, molecular formula C4H7NO2, molecular weight 101.10.
The persulfate includes potassium peroxydisulfate (molecular formula K2S2O8, molecular weight 270.32) or ammonium persulfate (molecular formula
(NH4)2S2O8, molecular weight 228.201), sulphite includes sodium sulfite (molecular formula Na2SO3, molecular weight 126.04) or sulfurous
Sour hydrogen sodium (molecular formula NaHSO3, molecular weight 104.06), ferrous salt is ferrous sulfate (molecular formula Fe2SO47H2O, molecular weight
278.02), sodium thiosulfate (molecular formula Na2S2O3·5H2O), the N, N, N ', N '-tetramethylethylenediamine (chemical formulas
(CH3)2NCH2CH2N(CH3)2, molecular weight 116.21), VC (molecular formula C6H8O6, molecular weight 176.12).
The low alkali accelerator preparation method of new liquid of the present invention includes following step：
1. claiming water 160ml, be divided into 100ml, 40ml, 20ml three parts are placed in beaker；
2. weighing polymer monomer, crosslinking agent, initiator, catalyst, and monomer and crosslinking agent are dissolved in 100 milliliters of burnings
In cup, initiator is dissolved in 40 milliliters of beakers, and catalyst is dissolved in 20 milliliters of beakers, for use；
With reference to glue sand, concrete strength test national standard, cement is weighed according to the ratio of mud of standard, pours into net slurry stirring
In the agitated kettle of machine, monomer and cross-linking agent solution, initiator solution, catalyst solution have then been poured into successively, has been stirred 20-
40 seconds, slurry is poured into mold rapidly and carries out later stage test.
Organic polymer monomer incorporates inside cement slurry, is excited under the action of initiator, is provided with monomer reactivity,
Autohemagglutination is generated backbone and is crosslinked between macromolecular chain and chain due to the presence of crosslinking agent, and the network knot of build is formd
Structure, forming polymer mesh structure makes jelling time shorten, and later stage cement continues aquation and solidifies to form inierpeneirating network structure；
The presence of active group-COO- in organic matter, can be with the Ca in hydrolysis product of cement2+, Mg2+, Al3+Occur chemical bond and
Effect, the chemical bonding between organic matter and polyvalent cation intert mutually with the crosslinked network of organic matter itself, improve boundary
Combination between face, improves flexural strength；Strand in the polyacrylamide of generation is very long, its amide groups can with very
More substances are affine, absorption, form hydrogen bond, the polyacrylamide of generation is made to have bridging action to cement granules；This of formation has
The inorganic inierpeneirating network structure of machine-is also obviously improved the toughness of cement-based material, is mainly manifested in crack resistance raising, flexural strength
Increase.Add the initial set of this accelerator cement, final setting time, 28 days compression strength are satisfied by the requirement of national standard, with diminishing
Agent adaptability is good.
Specific implementation mode
The professional standard (JC477-2005) using liquid accelerator is used for reference in this experiment, in this, as injection coagulation
The evaluation criterion of the low alkali accelerator of soil liquid.Specific requirement such as following table：
The preparation and maintenance of concrete sample are pressed《Gunite concrete mixing proportion design method》Carry out mix-design, resistance to compression
Sample is made by GBJ82-85.
Cement mortar strength experiment is carried out by test method JC477-2005.Measure the flexural strength of mortar specimen each age.
Embodiment 1：Weigh cement 400g, water 160ml (W/C=0.4), by moisture at the three of 100ml, 40ml, 20ml
Part is placed in three beakers, weighs acrylamide 14g, N, N- methylene-bisacrylamide 0.4g, ammonium persulfate 1.4g, N, N,
N ', N '-tetramethylethylenediamine 1g；By acrylamide and N, N- methylene-bisacrylamides are dissolved in the beaker for having 100ml water, mistake
Ammonium sulfate is dissolved in the beaker for having 40ml water, N, N, N ', N '-tetramethylethylenediamines are dissolved in the beaker for having 20ml water.By cement
It pours into the agitated kettle of net slurry blender, has sequentially added acrylamide and N, N- methylene-bisacrylamides solution, persulfuric acid
Ammonium salt solution, N, N, N ', N '-tetramethylethylenediamine solution is stirred 30 seconds, removes agitated kettle, carry out follow-up setting time,
Flexural strength, compressive strength test.It is 0.5 that cement mortar strength pilot country standard, which requires the ratio of mud, is by changing cement mixing content
320g is realized.
Embodiment 2：Weigh cement 400g, water 160ml (W/C=0.4), by moisture at the three of 100ml, 40ml, 20ml
It part is placed in three beakers, weighs Methacrylamide 6g, N- hydroxymethylacrylate 0.5g, potassium peroxydisulfate 1.6g, bisulfite
Sodium 1.2g；Methacrylamide and N- hydroxymethylacrylates are dissolved in the beaker for having 100ml water, potassium peroxydisulfate, which is dissolved in, to be had
In the beaker of 40ml water, sodium hydrogensulfite is dissolved in the beaker for having 20ml water.Cement is poured into the agitated kettle of net slurry blender,
Methacrylamide and N- hydroxymethylacrylates solution, potassium persulfate solution, solution of sodium bisulfite are sequentially added, stirring is mixed
It closes 30 seconds, removes agitated kettle, carry out follow-up setting time, flexural strength, compressive strength test.Cement mortar strength pilot country standard
It is required that the ratio of mud is 0.5, realized for 320g by changing cement mixing content.
Embodiment 3：Weigh cement 400g, water 160ml (W/C=0.4), by moisture at the three of 100ml, 40ml, 20ml
Part is placed in three beakers, weighs n-isopropyl acrylamide 14g, Methacrylamide 0.8g, potassium peroxydisulfate 1.6g,
VC1.6g；N-isopropyl acrylamide and Methacrylamide are dissolved in the beaker for having 100ml water, potassium peroxydisulfate, which is dissolved in, to be had
In the beaker of 40ml water, VC is dissolved in the beaker for having 20ml water.Cement is poured into the agitated kettle of net slurry blender, is sequentially added
There are n-isopropyl acrylamide and methacryl amine aqueous solution, potassium persulfate solution, VC solution, is stirred 20 seconds, removes and stir
Pot is mixed, follow-up setting time, flexural strength, compressive strength test are carried out.Cement mortar strength pilot country standard requires the ratio of mud to be
0.5, it is realized for 320g by changing cement mixing content.
Embodiment 4：Weigh cement 400g, water 160ml (W/C=0.4), by moisture at the three of 100ml, 40ml, 20ml
It part is placed in three beakers, weighs acrylic acid 14g, N, N- methylene-bisacrylamide 0.8g, hydrogen peroxide 1.6g, ferrous sulfate
1.6g；By acrylic acid and N, N- methylene-bisacrylamides are dissolved in the beaker for having 100ml water, and hydrogen peroxide, which is dissolved in, 40ml
In the beaker of water, ferrous sulfate is dissolved in the beaker for having 20ml water.Cement is poured into the agitated kettle of net slurry blender, is added successively
Entering has acrylic acid and N, and N- methylene-bisacrylamides solution, hydrogenperoxide steam generator, ferrous sulfate solution are stirred 25 seconds,
Agitated kettle is removed, follow-up setting time, flexural strength, compressive strength test are carried out.Cement mortar strength pilot country standard requires water
Gray scale is 0.5, is realized for 320g by changing cement mixing content.
Embodiment 5：Weigh cement 400g, water 160ml (W/C=0.4), by moisture at the three of 100ml, 40ml, 20ml
It part is placed in three beakers, weighs acrylamide 14g, N, N- methylene-bisacrylamide 0.5g, potassium peroxydisulfate 1.2g, thio sulphur
Sour sodium 1.4g；By acrylamide and N, N- methylene-bisacrylamides are dissolved in the beaker for having 100ml water, and potassium peroxydisulfate is dissolved in
In the beaker for having 40ml water, sodium thiosulfate is dissolved in the beaker for having 20ml water.Cement is poured into the agitated kettle of net slurry blender
In, sequentially add acrylamide and N, N- methylene-bisacrylamides solution, potassium persulfate solution, hypo solution,
It is stirred 35 seconds, removes agitated kettle, carry out follow-up setting time, flexural strength, compressive strength test.Cement mortar strength pilot country
It is 0.5 that family's standard, which requires the ratio of mud, is realized for 320g by changing cement mixing content.
Embodiment 6：Weigh cement 400g, water 160ml (W/C=0.4), by moisture at the three of 100ml, 40ml, 20ml
Part is placed in three beakers, weighs acrylamide 12g, N- hydroxymethylacrylate 0.7g, ammonium persulfate 1.4g, rongalite 1.3g；
Acrylamide and N- hydroxymethylacrylates are dissolved in the beaker for having 100ml water, ammonium persulfate is dissolved in the beaker for having 40ml water,
Rongalite is dissolved in the beaker for having 20ml water.Cement is poured into the agitated kettle of net slurry blender, has sequentially added acrylamide
It with N- hydroxymethylacrylates solution, ammonium persulfate solution, rongalite solution, is stirred 30 seconds, removes agitated kettle, carry out follow-up
Setting time, flexural strength, compressive strength test.It is 0.5 that cement mortar strength pilot country standard, which requires the ratio of mud, by changing water
Mud volume is realized for 320g.
Embodiment 7：Weigh cement 400g, water 160ml (W/C=0.4), by moisture at the three of 100ml, 40ml, 20ml
Part is placed in three beakers, weighs acrylamide 8g, N, N- methylene-bisacrylamide 0.4g, potassium peroxydisulfate 1.2g, N, N, N ',
N '-tetramethylethylenediamines 1.6g；By acrylamide and N, N- methylene-bisacrylamides are dissolved in the beaker for having 100ml water, mistake
Potassium sulfate is dissolved in the beaker for having 40ml water, N, N, N ', N '-tetramethylethylenediamines are dissolved in the beaker for having 20ml water.By cement
It pours into the agitated kettle of net slurry blender, has sequentially added acrylamide and N, N- methylene-bisacrylamides solution, persulfuric acid
Potassium solution, N, N, N ', N '-tetramethylethylenediamine solution is stirred 40 seconds, removes agitated kettle, carry out follow-up setting time,
Flexural strength, compressive strength test.It is 0.5 that cement mortar strength pilot country standard, which requires the ratio of mud, and change cement mixing content is 320g
It realizes.
Accelerator in embodiment (F1-F7) is added, the results are shown in Table 1 with final setting time for cement initial set, forms interpenetrating
The accelerator of network structure can largely shorten the presetting period of cement-based material, at the beginning of the cement for adding F2 accelerators
The solidifying time only has 10 seconds, adds such accelerator cement final setting time and basically reaches JC447-2005 certified products requirements.
Adding accelerator in embodiment, the results are shown in Table 2 on the influence of the setting time of different cement, uses coloured glaze
PO42.5 the and PO32.5 cement of river board, Lafarge board, northern black or white board for writing temporary accounts or records on, addition example 1 (F1), the accelerator of example 2 (F2) formula,
Accelerator volume is in 4.2%-6%, the results show that can meet JC447-2005 certified products requirements.
Addition embodiment (F1-F7) accelerator shows with water-reducing agent adaptability result such as table 3, can be seen by the data of gained
Go out, water-reducing agent participates in so that the initial set of cement and final setting time increase, using the reduction ratio of mud or improve accelerator volume
Method can be such that setting time meets the requirements.
The concrete crushing strength test result for adding embodiment (F1-F7) accelerator is as shown in table 4, such accelerator
Use result in the generally reduction of 28 days intensity, 28 days compression strength retention of F1 type accelerators are 80.8%, and F7 types
28 days compression strength retention reached 83%, all formula (F1-F7) accelerator days compression strength retention is above day
The 78.4% of Tianjin board accelerator, complies with the national standard requirements.
The results are shown in Table 5 for the glue sand flexural strength of addition embodiment (F1-F7) accelerator, using coloured glaze river board
The accelerator of each example (F1-F7) formula is added, it can be seen from glue sand flexural strength experimental result not in PO42.5 cement
Cement early stage and 28 days flexural strengths can be significantly improved with formula accelerator.
Table 1：Embodiment formula and cement setting time
(A：Polymer monomer；M：Crosslinking agent；P：Initiator；T：Catalyst)
2 accelerator of table influences different cement setting times
The adaptability (time) of table 3- accelerators and water-reducing agent
Table 4- adds accelerator concrete crushing strength test result
The glue sand flexural strength of table 5- coloured glazes river PO42.5 cement tests table
Claims (5)
1. a kind of preparation method forming the low alkali accelerator of inierpeneirating network structure liquid, it is characterised in that using polymer monomer as
Organic components are added in cement, monomer in-situ polymerization and the hardening of cement continuous hydration under initiator and catalyst action
To form inierpeneirating network structure；
Raw material is the component of following weight part ratio：
Polymer monomer is acrylamide, n-isopropyl acrylamide, Methacrylamide or acrylic acid.
2. preparation method according to claim 1, it is characterised in that：Crosslinking agent is N,N methylene bis acrylamide, N-
Hydroxymethyl acrylamide or Methacrylamide.
3. preparation method according to claim 1, it is characterised in that：It the initiator of redox composite initiation system and urges
Agent compatibility is hydrogen peroxide-ferrous iron salt, persulfate-ferrous iron salt or persulfate-sulfites, and reducing agent is sub-
Sulfate, rongalite, thiosulfate, N, N, N ', N '-tetramethylethylenediamines or VC.
4. the low alkali accelerator of liquid prepared by application preparation method as described in claim 1-3 any one.
5. the low alkali accelerator of liquid and cement mixing technique, which is characterized in that include the following steps：
1. cement is poured into the agitated kettle of net slurry blender；
2. sequentially adding polymer monomer and cross-linking agent solution, initiator solution, catalyst solution, it is stirred 20-40 seconds.
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| CN110510906A (en) * | 2019-09-30 | 2019-11-29 | 山东中岩建材科技有限公司 | A kind of alkali-free liquid accelerator and preparation method thereof |
| CN111363077A (en) * | 2020-04-09 | 2020-07-03 | 澳门大学 | Polymer cement-based material and preparation method and application thereof |
| CN111517703A (en) * | 2020-04-29 | 2020-08-11 | 澳门大学 | High-fracture-resistance cement-based material and preparation method thereof |
| CN111635497A (en) * | 2020-05-26 | 2020-09-08 | 北京建筑材料科学研究总院有限公司 | Underwater concrete anti-dispersant and preparation method thereof |
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| CN114538819A (en) * | 2022-03-11 | 2022-05-27 | 北京工业大学 | Preparation method of trapezoidal-structure-component liquid alkali-free setting accelerator |
| CN114605102A (en) * | 2022-02-23 | 2022-06-10 | 青岛市地铁四号线有限公司 | Quick-setting micro-expansion cement-based grouting material with anti-dispersion property and preparation method thereof |
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| CN116102324A (en) * | 2023-04-13 | 2023-05-12 | 河北工业大学 | Multistage interpenetrating network modified cement-based composite material and preparation method thereof |
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