CN109796163A - A kind of anti-shrinkage concrete and its preparation process - Google Patents
A kind of anti-shrinkage concrete and its preparation process Download PDFInfo
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Abstract
The present invention relates to a kind of anti-shrinkage concrete, it is related to the technical field of concrete preparation, it includes following raw material: 200-260 parts of cement, 30-45 parts of miberal powder, 70-110 parts of flyash, 740-840 parts of yellow ground, 1000-1020 parts of rubble, 3-7 parts of water-reducing agent, 1-5 parts of swelling agent, 1-5 parts of defoaming agent and 170-200 parts of water.By adjusting the proportion between each raw material of concrete, and functional additive is added, concrete contraction percentage is reduced, effective concrete structure of reducing or remitting is because early-age shrinkage, drying shrinkage and shrinkage generate harmful cracks, reach good anti-crack and anti-seepage effect, to improve the intensity of concrete.
Description
Technical field
The present invention relates to the technical fields of concrete preparation, more particularly, to a kind of anti-shrinkage concrete and its preparation work
Skill.
Background technique
Concrete is one of the present age most important civil engineering material, is widely used in the every aspect of building field.But
Be, due to concrete, the especially generally existing shrinkage phenomenon such as mass concrete and high-strength concrete, cause concrete cracking,
The reduced performances such as intensity, antiseepage, anticorrosive.
Summary of the invention
The object of the present invention is to provide a kind of anti-shrinkage concrete and its preparation processes, by adjusting each raw material of concrete
Between proportion, and functional additive is added, reduces concrete contraction percentage, effective concrete structure of reducing or remitting is because of early stage
Contraction, drying shrinkage and shrinkage generate harmful cracks, reach good anti-crack and anti-seepage effect, to improve the intensity of concrete.
Foregoing invention purpose of the invention has the technical scheme that
A kind of anti-shrinkage concrete, including following raw material: 200-260 parts of cement, 30-45 parts of miberal powder, flyash
70-110 parts, 740-840 parts of yellow ground, 1000-1020 parts of rubble, 3-7 parts of water-reducing agent, 1-5 parts of swelling agent, 1-5 parts of defoaming agent, with
And 170-200 parts of water.
By using above-mentioned technical proposal, cement: powdery hydraulicity inorganic coagulation material, at slurry, energy after adding water and stirring
Hardening or in water preferably hardening in air, and can the materials such as sand, stone are cemented together securely.
The role in concrete such as flyash, miberal powder is mainly the workability for increasing concrete, increases concrete
Drying shrinkage, crack resistance adjust strength grade of concrete, and mixing in concrete mixing natural or artificial can improve concrete
The powdered ore substance of performance, and it is corrosion-resistant, and early strength is high.
The effect of yellow ground is the gap for filling stone, keeps concrete more closely knit.In addition cement mortar is formed with cement slurry,
Improve the workability and mobility of concrete.
Rubble, which plays the role of reducing, to be shunk, and cement slurry contraction is very big, and rubble plays inhibition and shrinks, and stable volume is made very much
With, meanwhile, reduce Cost of Concrete.
Water-reducing agent can reduce institute's water requirement when concrete mixing, and can increase the intensity of concrete.
Swelling agent has compensating concrete drying shrinkage and air-free concrete, improves concrete permeability resistance effect.In civil engineering
In be mainly used for waterproof and the aspect of cracking resistance two, outer waterproof homework can be cancelled, extend last-cost joint spacing, prevent mass concrete
With the appearance of high-strength concrete temperature difference crack.Defoaming agent is the bubble generated mixing and stirring concrete to eliminate, and increases coagulation
The intensity of soil.By adjusting the proportion between each raw material of concrete, and functional additive is added, reduces concrete shrinkage
Rate, effective concrete structure of reducing or remitting reach good anti-crack and anti-seepage because early-age shrinkage, drying shrinkage and shrinkage generate harmful cracks
Effect, to improve the intensity of concrete.
The present invention is further arranged to: further including following raw material in the concrete: nitrilotriacetic acid 0.1-0.5
Part, 0.2-0.6 parts of gluconic acid, 0.4-0.8 parts of sodium polyphosphate.
By using above-mentioned technical proposal, nitrilotriacetic acid, gluconic acid and sodium polyphosphate are as chelating agent, to inhale
Calcium, magnesium, chloride ion in attached concrete, prevent calcium and magnesium ion excessive, influence the intensity of concrete.Since chloride ion can hydrolyze,
To the reinforcing bar in corrosion concrete, so that the structure of armored concrete is influenced, to reduce the intensity of armored concrete.
The present invention is further arranged to: the water-reducing agent includes following weight percent meter raw material: beta-cyclodextrin 6-10%,
Monomethyl polyethylene glycol acrylate ester 10-14%, methylpropene sodium sulfonate 6-10%, asparatate 16-20%, mercaptopropionic acid
0.3-0.7%, tert-butyl hydroperoxide 0.1-0.5%, sodium pyrosulfite 0.1-0.5%, N,N methylene bis acrylamide
0.2-0.6%, dispersing agent 0.1-0.5%, butanediol 1-5%, the first auxiliary agent 1-5%, triethanolamine 6-10%, surplus is water.
By using above-mentioned technical proposal, beta-cyclodextrin can be in tert-butyl hydroperoxide, sodium pyrosulfite, mercaptopropionic acid
And copolymerization is crosslinked with monomethyl polyethylene glycol acrylate ester under the catalysis of N, N- methylene-bisacrylamide, so that poly-
There is beta-cyclodextrin group in the strand of glycol monoethyl ether acrylate.
Due to self character, outside shows as showing as hydrophobicity on the inside of hydrophily beta-cyclodextrin group, so as to
The guarantor of enhancing water-reducing agent is collapsed ability, and the water-retaining property and cohesiveness of concrete are improved.
Asparatate can be in mercaptopropionic acid, tert-butyl hydroperoxide, sodium pyrosulfite and N, N- methylene bisacrylamide
Amide catalysis is lower to react with monomethyl polyethylene glycol acrylate ester, so that on monomethyl polyethylene glycol acrylate ester strand
Introduce carboxyl.
Methylpropene sodium sulfonate can be in mercaptopropionic acid, tert-butyl hydroperoxide, sodium pyrosulfite and N, N- di-2-ethylhexylphosphine oxide
Acrylamide catalysis is lower to react with monomethyl polyethylene glycol acrylate ester, so that monomethyl polyethylene glycol acrylate ester molecule
Sulfonic acid group is introduced on chain.
Since carboxyl and sulfonic acid group are a kind of hydrophilic radicals, it is stretched in aqueous solution, it can be in adsorbed cement
Particle surface is formed with certain thickness hydrophily solid adsorption layer.When cement granules are close to each other, adsorption layer starts to be overlapped,
Steric hindrance effect is generated i.e. between cement granules, overlapping is more, and steric hindrance repulsion is bigger, between cohesion cement granules
Obstruction it is also bigger so that the slump of concrete keeps good.
Water-reducing agent can be grafted some branches, these branches can not only mention during preparation on diminishing agent molecule
For space steric effect, and in the high alkalinity environment of hydrated cementitious, these branches can also be gradually cut off, to discharge
The polycarboxylic acid of peptizaiton is provided, the dispersion effect of cement granules, and control slump loss thus can be improved.
By introducing beta-cyclodextrin group, carboxyl and sulfonic acid group in macromolecular, the branch on macromolecular strand is improved
Chain quantity, to improve the water-reducing effect and slump retaining of water-reducing agent.Simultaneously as the steric hindrance between three kinds of groups is different,
By the effect between three kinds of group steric hindrances, the anti-mud and slump retaining of water-reducing agent are improved.And due between three kinds of groups
Contained current potential and steric hindrance between synergistic effect, can be improved the graft reaction of three kinds of groups, improve in macromolecular effectively
The introduction volume of group.
Tert-butyl hydroperoxide and sodium pyrosulfite can form redox system, to cause alkenes, diene class list
The free radical polymerization of body and copolymerization, it can also be used to which the crosslinking curing and high molecular crosslink of unsaturated polyester (UP) react.
Mercaptopropionic acid is as chain-transferring agent, and N, for N- methylene-bisacrylamide as crosslinking agent, dispersing agent is each to improve
Dispersibility between raw material.Butanediol as solvent, help emulsion and dispersing agent, improve the solubility and dispersibility of each raw material.
PH value of the triethanolamine to adjust water-reducing agent, keeps the pH value of water-reducing agent, prevents change of the water-reducing agent due to pH value
Change and decompose, influences the effectiveness of water-reducing agent.
First auxiliary agent improves the intensity of concrete to fill concrete as filler.
The present invention is further arranged to: first auxiliary agent includes following weight percent meter raw material: sepiolite fibre 16-
20%, bis- chloro- [5,5]-hendecane-hexamethylene diamine copolymer of chloro- tetra- chloro -3,9- hosphospiro -3,9- of 2,4,8,10- two of 3,9-
10-14%, two phosphoryl chloride phosphorus oxychloride 2-6% of pentaerythrite diphosphate ester, dimethyl sulfoxide 20-24%, low density polyethylene (LDPE) 10-14%, horse
Come acid anhydrides 1-5%, titanate coupling agent 0.2-0.6%, surplus is water.
By using above-mentioned technical proposal, sepiolite is a kind of aqueous magnesium silicate of threadiness, since sepiolite agglomerates
A large amount of concrete can be adsorbed in body particle, while the Si-OH group that its surface Si-O-Si chain breaking part generates is with biggish
Chemical activity can generate chemical bonding with concrete, thus there is stronger concrete-particle interface bondings to make in system
With to play reinforcing effect.When concrete shrinkage, the cementation of concrete-particle interface is adsorbed on sea by disaccommodation
Afrodite agglomerates intracorporal concrete and remains to assign the preferable mechanical property of concrete, achievees the purpose that reinforcing concrete.
Two phosphoryl chloride phosphorus oxychloride of pentaerythrite diphosphate ester is abbreviated as SPDPC, graft copolymerization can occur with sepiolite fibre, generate
Twin-screw is grafted sepiolite fibre.
Bis- two chloro- [5,5]-hendecane-hexamethylene diamines of chloro- tetra- chloro -3,9- hosphospiro -3,9- of 2,4,8,10- of 3,9- are total
Polymers is abbreviated as PSPHD, and sepiolite fibre can be grafted with twin-screw and occurs to carry out graft copolymerization, is had to sepiolite fibre
Machine is modified, to improve the flame retardant property of sepiolite fibre, has reached enhancing and the fire-retardant effect of synergistic.
Maleic anhydride provides sepiolite fibre and the graft copolymerization condition of SPDPC to be acidified sepiolite fibre.Together
When, with beta-cyclodextrin esterification can also occur for maleic anhydride, generate maleic acid-beta-cyclodextrin, then can be in tert-butyl
Hydrogen peroxide, sodium pyrosulfite, mercaptopropionic acid and N,N methylene bis acrylamide catalysis under with poly glycol monomethyl ether third
Olefin(e) acid ester and methylpropene sodium sulfonate are copolymerized, and generate a kind of water-reducing agent containing beta-cyclodextrin group, improve beta-cyclodextrin
Grafting rate in macromolecular collapses ability so as to improve the guarantor of water-reducing agent, improves the water-retaining property and cohesiveness of concrete.
Dimethyl sulfoxide and low density polyethylene (LDPE) are as solvent, respectively to dissolve SPDPC and PSPHD.
Titanate coupling agent improving the interface between sepiolite fibre and organic matter, improve sepiolite fibre with it is organic
Contact between object improves the anti-flammability and intensity of concrete to improve the modification of sepiolite fibre.
The present invention is further arranged to: the swelling agent includes the raw material of following weight percentage: steel slag 15-25%, phosphorus
Gypsum 15-25%, high calcium sulphur aluminium clinker 15-25%, lime stone 10-20%, polypropylene fibre 1-10%, steel fibre 1-5%,
Two auxiliary agent 15-19%.
By using above-mentioned technical proposal, steel slag is one of steelmaking process byproduct, it by the pig iron silicon, manganese,
The salt that the impurity such as phosphorus, sulphur various oxides and these oxides made of aoxidizing in fusion process and solvent reaction generate
It is formed.Steel slag is containing there are many useful components: metallic iron 2%-8%, calcium oxide 40%-60%, magnesia 3%-10%, oxidation
Manganese 1%-8%, therefore can be used as the use of Ferrous Metallurgy raw material, it also can be used as manufacture road-making material, construction material or agricultural fertilizer
Raw material.
The specific surface agent for the steel slag being used in the present invention is 500-800m2/ kg, and 5.5h is impregnated in extract liquor, extract
Taking the weight ratio of liquid and steel slag is 1:8.Extract liquor includes acetone 15%, glycerol 25%, barium nitrate 5%, butyl acetate 5%, with
And 50% water.To prevent the presence of calcium oxide and magnesia from leading to later period coagulation for steel slag calcium oxide and magnesia elimination
The expansion of soil is uncontrollable, is destroyed so as to cause the structure of concrete.
The ardealite being used in the present invention at 45 DEG C freeze-day with constant temperature to free water content less than 1%, after grinding cross 80
Mesh square hole screen.
By the way that steel slag and ardealite is added, the new of a solid waste utilization of resources is opened for industrial residue and phosphorus ore industry
Approach reduces industrial residue to the pollution of environment and the production cost of enterprise.
After high calcium sulphur aluminium clinker, lime stone, steel slag and ardealite mix in proportion, swelling agent can be made.
Swelling agent will appear anhydrous slufuric acid reactive aluminum early stage mixing in concrete, can generate alunite in mid-term,
Swelling agent, which gradually rises up into concrete and mixes water, can generate more expansion joint crystalline compounds later, so as to cause coagulation
There is certain expansion in soil, and cancels out each other with the free shrinkage in concrete.
The crushing resistance and fold resistance of polypropylene fibre and steel fibre to increase concrete.And when polypropylene fibre enters
When in concrete, in polypropylene will form a kind of three-dimensional confusion system of complexity, to hinder the loss of moisture, thus
Reduce the shrinking percentage of concrete.
By the way that swelling agent and poly- third fiber to be used in compounding, the expansion effect to concrete is improved, and facilitate worker's control
The degrees of expansion of later concrete, to reduce concrete contraction percentage, effective concrete structure of reducing or remitting is because of early-age shrinkage, dry
Contracting and shrinkage generate harmful cracks, reach good anti-crack and anti-seepage effect, to improve the intensity of concrete.
The present invention is further arranged to: second auxiliary agent includes the raw material of following weight percentage: modified zeolite 36-
40%, tara gum 6-10%, silane coupling agent 1-5%, dipropyl ethyl alcohol 1-5%, calcium hydroxide 2-6%, chitosan 1-
5%, surplus is water.
By using above-mentioned technical proposal, the preparation process of modified zeolite is used zeolite and trimethyl bromination
Ammonium mixing, and be passed through high-temperature vapor and zeolite is heated, obtain modified zeolite；Zeolite and dodecyl trimethyl ammonium bromide
Weight ratio be 1:1.5.
After tara gum can be mixed with water, a kind of colloid with certain viscosity is formed, it is each so as to coat very well
Raw material improves the conjugation between raw material.
With modified zeolite coupling reaction can occur for chitosan under silane coupling agent effect, resist so that swelling agent has
The effect of bacterium.
Silane coupling agent is also used as dispersing agent, improves the dispersion effect between each raw material.
Dipropyl ethyl alcohol improves the solubility between each raw material as solvent.
And the early strength and impermeability of concrete can be improved in lime stone, and can be with sulphur in ardealite in concrete
Middle formation calcium sulfate, volume expansion can effectively fill up the contraction of own vol and the heat of hydration in course of hardening
Caused shrinkage capillary gap, to improve the consistency of concrete.
Dipropyl ethyl alcohol can play booster action to lime stone, can reduce the surface tension of pore water, reduce capillary
The shrinkage stress generated when the dehydration of hole increases the viscosity of concrete pore water, improves the shrinkage value of concrete.
PH of the calcium hydroxide to adjust swelling agent.
A kind of preparation method of anti-shrinkage concrete, including following preparation step:
1) water-reducing agent is prepared in proportion:
A. the first auxiliary agent is prepared in proportion；
B. beta-cyclodextrin, monomethyl polyethylene glycol acrylate ester, methylpropene sodium sulfonate, butanediol and water are mixed in proportion
After closing uniformly, mixture first is made；
C. tert-butyl hydroperoxide and dispersing agent is added in mixture first in proportion, mixture second is made；
D. asparatate, N,N methylene bis acrylamide, sodium pyrosulfite and mercaptopropionic acid are mixed in proportion and is added
Enter into mixture second, mixture third is made；
E. the first auxiliary agent is added in mixture third, mixture fourth is made；
F. triethanolamine is added in mixture fourth in proportion, water-reducing agent is made；
2) swelling agent is prepared in proportion:
A. the second auxiliary agent is prepared in proportion；
B. the first mixture is made after in proportion mixing steel slag, ardealite, high calcium sulphur aluminium clinker and lime stone；
C. by the first mixture powder grinds, and during the first mixture powder grinds, the second auxiliary agent is atomized
It is sprayed on the outer surface of the first mixture afterwards, after being thoroughly mixed, the second mixture is made；
D. polypropylene fibre and steel fibre are added in the second mixture in proportion, are thoroughly mixed, expansion is made
Agent；
3) in proportion by rubble, yellow ground, cement, miberal powder, flyash, water-reducing agent, swelling agent, defoaming agent, nitrilotriacetic acid,
Gluconic acid, sodium polyphosphate after mixing, are added water and stir evenly, concrete is made.
By using above-mentioned technical proposal, in step 1, first by beta-cyclodextrin, monomethyl polyethylene glycol acrylate ester, methyl
Sodium allylsulfonate, butanediol and water after mixing, add tert-butyl hydroperoxide and dispersing agent, asparagine are then added
Acid, N, N- methylene-bisacrylamide, sodium pyrosulfite and mercaptopropionic acid allow beta-cyclodextrin sufficiently graft copolymerization poly-
On glycol monoethyl ether acrylate, prevent the presence of sulfonic acid group and carboxyl from influencing the graft copolymerization of beta-cyclodextrin, to drop
The content of low beta-cyclodextrin group.
After first steel slag, ardealite, high calcium sulphur aluminium clinker and lime stone being mixed in step 2, be made the first mixture, then
It will be sprayed on the outer surface of the first mixture after the atomization of second auxiliary agent, to improve connecing between the second auxiliary agent and the first mixture
Contacting surface product and the extent of reaction.It is eventually adding polypropylene fibre and steel fibre is added to the second mixture, since the second auxiliary agent has
Certain viscosity can make polypropylene fibre and steel fibre be adsorbed on the first mixture, improve polypropylene fibre and steel is fine
The conjugation of dimension and swelling agent.
The present invention is further arranged to: first auxiliary agent includes following preparation process:
A. after in proportion mixing maleic anhydride and water, A mixture is made；
B. after in proportion mixing sepiolite fibre and A mixture, B mixture is made；
C. it after in proportion mixing two phosphoryl chloride phosphorus oxychloride of pentaerythrite diphosphate ester and dimethyl sulfoxide, is added in B mixture, makes
Obtain C mixture；
D. in proportion by the chloro- tetra- chloro -3,9- hosphospiro -3,9- two chloro- [5,5]-ten one of 2,4,8,10- of 3,9- bis-
Alkane-hexamethylene diamine copolymer, low density polyethylene (LDPE) and titanate coupling agent are added in C mixture, and the first auxiliary agent is made.
By using above-mentioned technical proposal, maleic anhydride is first added, adds sepiolite fibre, to prepare acid Hai Pao
Mineral wool, Activated Sepiolite fiber provide reaction environment for next reaction, improve reaction efficiency.Then SPDPC is added,
Preparing intermediate product -- twin-screw is grafted sepiolite fibre.It is eventually adding PSPHD, sepiolite fibre hair can be grafted with twin-screw
It is raw to carry out graft copolymerization, it is organically-modified to sepiolite fibre progress, to improve the flame retardant property of sepiolite fibre, have reached increasing
Strong and fire-retardant synergistic effect.
The present invention is further arranged to: second auxiliary agent includes following preparation process:
A. after in proportion mixing tara gum and dipropyl ethyl alcohol, then it is proportionally added into water, after mixing, is made the
One mixed liquor；
B. calcium hydroxide is added in the first mixed liquor in proportion, the second mixed liquor is made；
C. chitosan, silane coupling agent and modified zeolite are added in the second mixed liquor in proportion, after mixing, system
Obtain the second auxiliary agent.
By using above-mentioned technical proposal, first tara gum and dipropyl ethyl alcohol are mixed, improve tara gum in water
Dispersibility and solubility, accelerate the solution rate of tara gum.Calcium hydroxide is added, so that tara gum solution can be with shape
The pH value of tara gum solution is adjusted to stablize tara gum solution at the gel with certain viscosity.It is poly- to be eventually adding shell
Sugar, silane coupling agent and modified zeolite, so that chitosan, silane coupling agent and modified zeolite can be very good to be combined together,
The contact area between each raw material is improved, so as to improve the coupling reaction of chitosan and modified zeolite, so that expansion
Agent has the effect of antibacterial.
In conclusion advantageous effects of the invention are as follows:
1. by adjusting the proportion between each raw material of concrete, and functional additive is added, reduces concrete and receive
It is anti-to reach good cracking resistance because early-age shrinkage, drying shrinkage and shrinkage generate harmful cracks for shrinkage, effective concrete structure of reducing or remitting
Effect is seeped, to improve the intensity of concrete；
2. being improved on macromolecular strand by introducing beta-cyclodextrin group, carboxyl and sulfonic acid group in macromolecular
Branch quantity, so that the water-reducing effect and slump retaining of water-reducing agent are improved, simultaneously as the steric hindrance between three kinds of groups is not
Together, the anti-mud and slump retaining of water-reducing agent are improved by the effect between three kinds of group steric hindrances, and due to three kinds of groups it
Between contained current potential and steric hindrance between synergistic effect, can be improved the graft reaction of three kinds of groups, improving has in macromolecular
Imitate the introduction volume of group；
3. being improved by the way that steel slag, ardealite, high calcium sulphur aluminium clinker and limestone mix to be used in compounding with poly- third fiber
To the expansion effect of concrete, and the degrees of expansion for facilitating worker to control later concrete has to reduce concrete contraction percentage
The deduction and exemption concrete structure of effect reaches good anti-crack and anti-seepage effect because early-age shrinkage, drying shrinkage and shrinkage generate harmful cracks,
To improve the intensity of concrete.
Specific embodiment
A kind of preparation method of anti-shrinkage concrete, including following preparation step are disclosed for the present invention:
1) water-reducing agent is prepared in proportion:
A. the first auxiliary agent is prepared in proportion；
A. after the water of 3% maleic anhydride and 28.6% being mixed, A mixture is made；
B. after mixing 18% sepiolite fibre and A mixture, B mixture is made；
C. it after the dimethyl sulfoxide of 4% SPDPC and 22% being mixed, is added in B mixture, C mixture is made；
D. 12% PSPHD, 12% low density polyethylene (LDPE) and 0.4% titanate coupling agent are added to C mixture
In, the first auxiliary agent is made；The model TCA-AA75's that titanate coupling agent is sold using Nanjing Neng De Chemical Co., Ltd.
Titanate coupling agent；
B. by 8% beta-cyclodextrin, 12% monomethyl polyethylene glycol acrylate ester, 8% methylpropene sodium sulfonate,
3% butanediol and 38.2% water after mixing, be made mixture first；
C. 0.3% tert-butyl hydroperoxide and 0.3% dispersing agent are added in mixture first, mixture second is made；
The concrete dispersing agent that ten thousand surfactants are sold in dispersing agent use；
D. by 18% asparatate, 0.4% N,N methylene bis acrylamide, 0.3% sodium pyrosulfite and
0.5% mercaptopropionic acid is mixed to join in mixture second, and mixture third is made；
E. the first auxiliary agent is added in mixture third, mixture fourth is made；
F. 8% triethanolamine is added in mixture fourth, water-reducing agent is made；
2) swelling agent is prepared in proportion:
A. the second auxiliary agent is prepared in proportion:
A. after the dipropyl ethyl alcohol of 8% tara gum and 3% being mixed, 41% water is added, after mixing, system
Obtain the first mixed liquor；
B. 4% calcium hydroxide is added in the first mixed liquor, the second mixed liquor is made；
C. 3% chitosan, 3% silane coupling agent and 38% modified zeolite are added in the second mixed liquor, are mixed
After closing stirring, the second auxiliary agent is made；
B. by 20% steel slag, 20% ardealite, 20% high calcium sulphur aluminium clinker and 15% lime stone mix after make
Obtain the first mixture；
C. by the first mixture powder grinds, and during the first mixture powder grinds, the second auxiliary agent is atomized
It is sprayed on the outer surface of the first mixture afterwards, after being thoroughly mixed, the second mixture is made；
D. the steel fibre of 5% polypropylene fibre and 3% is added in the second mixture, is thoroughly mixed, is made
Swelling agent；
3) by 1010 parts of rubble, 790 parts of yellow ground, 230 parts of cement, 38 parts of miberal powder, 90 parts of flyash, 5 parts
Water-reducing agent, 3 parts of swelling agent, 3 parts of defoaming agent, 0.3 part of nitrilotriacetic acid, 0.4 part of gluconic acid, 0.6 part more
Polyphosphate sodium after mixing, is added water and stirs evenly, concrete is made；The concrete defoaming that defoaming agent is sold using Guangdong ten thousand
Agent.
Embodiment 2-5 the difference from embodiment 1 is that, the anti-shrinkage concrete includes following raw material:
Embodiment 6-9 the difference from embodiment 1 is that, the water-reducing agent includes the raw material of following weight percent meter:
Embodiment 10-13 the difference from embodiment 1 is that, first auxiliary agent includes the original of following weight percent meter
Material:
Embodiment 14-17 the difference from embodiment 1 is that, the swelling agent includes the raw material of following weight percent meter:
Embodiment 18-21 the difference from embodiment 1 is that, second auxiliary agent includes the original of following weight percent meter
Material:
Comparative example
Comparative example 1 is with the difference of embodiment 1, does not include water-reducing agent in the anti-shrinkage concrete material；
Comparative example 2 is with the difference of embodiment 1, does not include swelling agent in the anti-shrinkage concrete material；
Comparative example 3 is with the difference of embodiment 1, does not include beta-cyclodextrin in the water-reducing agent；
Comparative example 4 is with the difference of embodiment 1, does not include methylpropene sodium sulfonate in the water-reducing agent；
Comparative example 5 is with the difference of embodiment 1, does not include asparatate in the water-reducing agent；
Comparative example 6 is with the difference of embodiment 1, does not include the first auxiliary agent in the water-reducing agent；
Comparative example 7 is with the difference of embodiment 1, does not include polypropylene fibre in the swelling agent；
The difference of comparative example 8 and embodiment 1 is, do not include in the swelling agent steel slag, ardealite, high calcium sulphur aluminium clinker and
The mixture of lime stone；
Comparative example 9 is with the difference of embodiment 1, does not include the second auxiliary agent in the swelling agent.
Embodiment 1-3 and comparative example 1-9 is subjected to GB/T50081-2002 " normal concrete mechanical test method mark
It is quasi- " test:
As seen from the above table, comparative example 1- is all better than using concrete prepared by present invention process, intensity and slump
9, illustrate that the intensity for having water-reducing agent and swelling agent that concrete can be improved is added.And its crushing resistance and anti-drawing property of splitting all are better than comparative example
1-9 illustrates that addition has water-reducing agent and swelling agent that its crushing resistance can be improved and resist and splits drawing.Meanwhile with fashioned iron adhesion strength
Better than comparative example 1-9, illustrating to be added has water-reducing agent and swelling agent that can reinforce concrete and fashioned iron adhesion strength, to improve reinforcing bar
The intensity of concrete structure.
Embodiment 1-3 and comparative example 3-6 is subjected to slump test:
1) wet slump cylinder first is smeared with wet cloth, spade mixes and stirs the apparatus such as plate.Slump cylinder is back cut diameter 100mm, lower port diameter
200mm, high 300mm, in horn-like.
2) concrete is prepared by match ratio.
3) slump cylinder is put in the stiffener plate not absorbed water, funnel is placed on slump cylinder, foot pedal, concrete point three
Layer is packed into cylinder, and the height of every layer of filling accounts for about the high one third of cylinder.Every layer is inserted along helix by edge to center with tamper
It smashes 25 times, must not impact.It plugs and pounds and should be uniformly distributed on interface for each time.When plugging and pounding a tin side concrete, tamper can be slightly inclined.
When plugging and pounding bottom, tamper should run through entire depth, when plugging and pounding other two layers, should be inserted through this layer and be inserted into lower layer about 20mm-30mm.
4) after loading, extra concrete is scraped off with trowel, and smooth out nozzle, remove the concrete around cylinder bottom.
Lift slump cylinder immediately immediately, mention cylinder and completed in 5-10s, and makes concrete not by transverse direction and twisting force.From starting to charge
It should be completed in 150s to proposition slump cone whole process.
5) slump cylinder is placed on cone concrete sample on one side, cylinder top lays flat the ruler towards concrete, uses steel ruler
Ruler bottom surface is measured to the vertical range of sample highest point, the as slump of the concrete batching system, exact value 1mm, as a result
The revision of the convention is to immediate 5mm.When the side of concrete sample is collapsed or one side failure by shear, then should resample another survey.
If above situation still occurs for the second time, then it represents that the concrete workability is bad, Ying Jilu.
6) after 1h, ruler bottom surface is measured to the vertical range of sample highest point with steel ruler again, the as concrete mixes and stirs
The 1h slump of object.
| Test sample | Volume/% | Initial slump (mm) | The 1h slump (mm) |
| Embodiment 1 | 1.65 | 250 | 185 |
| Embodiment 2 | 1.72 | 255 | 180 |
| Embodiment 3 | 1.68 | 250 | 180 |
| Comparative example 3 | 1.95 | 255 | 175 |
| Comparative example 4 | 1.97 | 260 | 180 |
| Comparative example 5 | 1.96 | 255 | 175 |
| Comparative example 6 | 1.86 | 250 | 165 |
As seen from the above table, using the water-reducing agent prepared in the embodiment of the present invention, 1 hour slump and divergence it is all small
In comparative example 3-6, illustrate that its function of slump protection is excellent.
Using the water-reducing agent prepared in the embodiment of the present invention, it can reach identical initial character when compared with low-dosage, say
Its bright water-reducing rate with higher.
Embodiment 1 illustrates compared with comparative example 3-5 by introducing beta-cyclodextrin group, carboxyl and sulfonic acid in macromolecular
Group improves the branch quantity on macromolecular strand, to improve the water-reducing effect and slump retaining of water-reducing agent.Simultaneously as
Steric hindrance between three kinds of groups is different, by the effect between three kinds of group steric hindrances, improves the anti-mud of water-reducing agent
And slump retaining.And due to the contained current potential between three kinds of groups and the synergistic effect between steric hindrance, three kinds of groups can be improved
Graft reaction, improve macromolecular on effectively group introduction volume
Embodiment 1 is compared with comparative example 6 it is found that explanation is collapsed by the way that the guarantor for having the first auxiliary agent that concrete can be improved is added
Property.
By embodiment 1-3 and comparative example 7-9 according to the requirement of building material industry standard JC476-2001, test of the invention
Limited expansion rate.
Using the swelling agent prepared in the embodiment of the present invention, it can reach identical initial character when compared with low-dosage, say
Its bright expansion rate with higher.And the limited expansion rate difference of its 90d and 180d is little, illustrates there is long-term volume stability
Performance.
The embodiment of present embodiment is presently preferred embodiments of the present invention, not limits protection of the invention according to this
Range, therefore: the equivalence changes that all structures under this invention, shape, principle are done, should all be covered by protection scope of the present invention it
It is interior.
Claims (9)
1. a kind of anti-shrinkage concrete, it is characterised in that: including following raw material: 200-260 parts of cement, miberal powder 30-45
Part, 70-110 parts of flyash, 740-840 parts of yellow ground, 1000-1020 parts of rubble, 3-7 parts of water-reducing agent, 1-5 parts of swelling agent, defoaming
1-5 parts of agent and 170-200 parts of water.
2. anti-shrinkage concrete according to claim 1, it is characterised in that: further include following parts by weight in the concrete
Raw material: 0.1-0.5 parts of nitrilotriacetic acid, 0.2-0.6 parts of gluconic acid, 0.4-0.8 parts of sodium polyphosphate.
3. anti-shrinkage concrete according to claim 1, it is characterised in that: the water-reducing agent includes following weight percent
Count raw material: beta-cyclodextrin 6-10%, monomethyl polyethylene glycol acrylate ester 10-14%, methylpropene sodium sulfonate 6-10%, lucid asparagus
Propylhomoserin 16-20%, mercaptopropionic acid 0.3-0.7%, tert-butyl hydroperoxide 0.1-0.5%, sodium pyrosulfite 0.1-0.5%, N, the Asia N-
Bisacrylamide 0.2-0.6%, dispersing agent 0.1-0.5%, butanediol 1-5%, the first auxiliary agent 1-5%, triethanolamine 6-10%,
Surplus is water.
4. anti-shrinkage concrete according to claim 3, it is characterised in that: first auxiliary agent includes following weight percent
Than counting raw material: tetra- chloro -3,9- hosphospiro -3,9- of the chloro- 2,4,8,10- of sepiolite fibre 16-20%, 3,9- bis- it is two chloro- [5,
5]-hendecane-hexamethylene diamine copolymer 10-14%, two phosphoryl chloride phosphorus oxychloride 2-6% of pentaerythrite diphosphate ester, dimethyl sulfoxide 20-24%, low close
Polyethylene 10-14%, maleic anhydride 1-5%, titanate coupling agent 0.2-0.6% are spent, surplus is water.
5. anti-shrinkage concrete according to claim 1, it is characterised in that: the swelling agent includes following weight percentage
Raw material: steel slag 15-25%, ardealite 15-25%, high calcium sulphur aluminium clinker 15-25%, lime stone 10-20%, polypropylene fibre 1-
10%, steel fibre 1-5%, the second auxiliary agent 15-19%.
6. anti-shrinkage concrete according to claim 5, it is characterised in that: second auxiliary agent includes following weight percent
The raw material of meter: modified zeolite 36-40%, tara gum 6-10%, silane coupling agent 1-5%, dipropyl ethyl alcohol 1-5%, calcium hydroxide
2-6%, chitosan 1-5%, surplus are water.
7. a kind of preparation method of anti-shrinkage concrete, it is characterised in that: including following preparation step:
1) water-reducing agent is prepared in proportion:
A. the first auxiliary agent is prepared in proportion；
B. beta-cyclodextrin, monomethyl polyethylene glycol acrylate ester, methylpropene sodium sulfonate, butanediol and water are mixed in proportion equal
After even, mixture first is made；
C. tert-butyl hydroperoxide and dispersing agent is added in mixture first in proportion, mixture second is made；
D. asparatate, N,N methylene bis acrylamide, sodium pyrosulfite and mercaptopropionic acid are mixed to join in proportion
In mixture second, mixture third is made；
E. the first auxiliary agent is added in mixture third, mixture fourth is made；
F. triethanolamine is added in mixture fourth in proportion, water-reducing agent is made；
2) swelling agent is prepared in proportion:
A. the second auxiliary agent is prepared in proportion；
B. the first mixture is made after in proportion mixing steel slag, ardealite, high calcium sulphur aluminium clinker and lime stone；
C. it by the first mixture powder grinds, and during the first mixture powder grinds, will be sprayed after the atomization of the second auxiliary agent
On the outer surface of the first mixture, after being thoroughly mixed, the second mixture is made；
D. polypropylene fibre and steel fibre are added in the second mixture in proportion, are thoroughly mixed, swelling agent is made；
3) in proportion by rubble, yellow ground, cement, miberal powder, flyash, water-reducing agent, swelling agent, defoaming agent, nitrilotriacetic acid, grape
Saccharic acid, sodium polyphosphate after mixing, are added water and stir evenly, concrete is made.
8. the preparation method of anti-shrinkage concrete according to claim 7, it is characterised in that: first auxiliary agent include with
Lower preparation process:
A. after in proportion mixing maleic anhydride and water, A mixture is made；
B. after in proportion mixing sepiolite fibre and A mixture, B mixture is made；
C. it after in proportion mixing two phosphoryl chloride phosphorus oxychloride of pentaerythrite diphosphate ester and dimethyl sulfoxide, is added in B mixture, C is made
Mixture；
D. in proportion by bis- chloro- [the 5,5]-hendecane-of chloro- tetra- chloro -3,9- hosphospiro -3,9- of 2,4,8,10- two of 3,9- oneself
Diamine copolymer, low density polyethylene (LDPE) and titanate coupling agent are added in C mixture, and the first auxiliary agent is made.
9. the preparation method of anti-shrinkage concrete according to claim 7, it is characterised in that: second auxiliary agent include with
Lower preparation process:
A. after in proportion mixing tara gum and dipropyl ethyl alcohol, then it is proportionally added into water, after mixing, it is mixed is made first
Close liquid;
B. calcium hydroxide is added in the first mixed liquor in proportion, the second mixed liquor is made;
C. chitosan, silane coupling agent and modified zeolite are added in the second mixed liquor in proportion, after mixing, are made the
Two auxiliary agents.
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| CN113968695A (en) * | 2021-09-24 | 2022-01-25 | 梁世峰 | Method for manufacturing viscosity-reducing dispersive concrete |
| CN116514471A (en) * | 2023-03-21 | 2023-08-01 | 上海隧港建筑材料有限公司 | Antifreezing and anti-cracking concrete |
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