CN111689713B - Special additive for concrete of prefabricated part and preparation method thereof - Google Patents
Special additive for concrete of prefabricated part and preparation method thereof Download PDFInfo
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- CN111689713B CN111689713B CN202010574279.XA CN202010574279A CN111689713B CN 111689713 B CN111689713 B CN 111689713B CN 202010574279 A CN202010574279 A CN 202010574279A CN 111689713 B CN111689713 B CN 111689713B
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- 239000004567 concrete Substances 0.000 title claims abstract description 88
- 239000000654 additive Substances 0.000 title claims abstract description 21
- 230000000996 additive effect Effects 0.000 title claims abstract description 21
- 238000002360 preparation method Methods 0.000 title abstract description 7
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 36
- 230000014759 maintenance of location Effects 0.000 claims abstract description 32
- 239000006260 foam Substances 0.000 claims abstract description 29
- 230000000087 stabilizing effect Effects 0.000 claims abstract description 29
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 26
- 229920005646 polycarboxylate Polymers 0.000 claims abstract description 22
- 239000008030 superplasticizer Substances 0.000 claims abstract description 19
- 239000000463 material Substances 0.000 claims abstract description 7
- 230000005284 excitation Effects 0.000 claims abstract description 4
- 239000002994 raw material Substances 0.000 claims abstract description 4
- NIXOWILDQLNWCW-UHFFFAOYSA-N acrylic acid group Chemical group C(C=C)(=O)O NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 claims description 54
- 238000003756 stirring Methods 0.000 claims description 40
- 150000003242 quaternary ammonium salts Chemical class 0.000 claims description 11
- 206010016807 Fluid retention Diseases 0.000 claims description 10
- IIPYXGDZVMZOAP-UHFFFAOYSA-N lithium nitrate Chemical group [Li+].[O-][N+]([O-])=O IIPYXGDZVMZOAP-UHFFFAOYSA-N 0.000 claims description 10
- HRPVXLWXLXDGHG-UHFFFAOYSA-N Acrylamide Chemical compound NC(=O)C=C HRPVXLWXLXDGHG-UHFFFAOYSA-N 0.000 claims description 9
- 229920002126 Acrylic acid copolymer Polymers 0.000 claims description 9
- 229920006322 acrylamide copolymer Polymers 0.000 claims description 9
- 239000008367 deionised water Substances 0.000 claims description 9
- 229910021641 deionized water Inorganic materials 0.000 claims description 9
- INHCSSUBVCNVSK-UHFFFAOYSA-L lithium sulfate Inorganic materials [Li+].[Li+].[O-]S([O-])(=O)=O INHCSSUBVCNVSK-UHFFFAOYSA-L 0.000 claims description 6
- RBTVSNLYYIMMKS-UHFFFAOYSA-N tert-butyl 3-aminoazetidine-1-carboxylate;hydrochloride Chemical compound Cl.CC(C)(C)OC(=O)N1CC(N)C1 RBTVSNLYYIMMKS-UHFFFAOYSA-N 0.000 claims description 6
- 229920000536 2-Acrylamido-2-methylpropane sulfonic acid Polymers 0.000 claims description 3
- XHZPRMZZQOIPDS-UHFFFAOYSA-N 2-Methyl-2-[(1-oxo-2-propenyl)amino]-1-propanesulfonic acid Chemical compound OS(=O)(=O)CC(C)(C)NC(=O)C=C XHZPRMZZQOIPDS-UHFFFAOYSA-N 0.000 claims description 3
- 238000000034 method Methods 0.000 claims description 3
- 230000003213 activating effect Effects 0.000 claims description 2
- 238000005303 weighing Methods 0.000 claims description 2
- 230000000740 bleeding effect Effects 0.000 abstract description 5
- WSFSSNUMVMOOMR-NJFSPNSNSA-N methanone Chemical compound O=[14CH2] WSFSSNUMVMOOMR-NJFSPNSNSA-N 0.000 abstract 1
- 230000009972 noncorrosive effect Effects 0.000 abstract 1
- 239000003638 chemical reducing agent Substances 0.000 description 15
- 229920001577 copolymer Polymers 0.000 description 15
- 239000002253 acid Substances 0.000 description 8
- 238000010276 construction Methods 0.000 description 8
- 238000002156 mixing Methods 0.000 description 8
- WSFSSNUMVMOOMR-UHFFFAOYSA-N Formaldehyde Chemical compound O=C WSFSSNUMVMOOMR-UHFFFAOYSA-N 0.000 description 6
- 230000000052 comparative effect Effects 0.000 description 5
- AEQDJSLRWYMAQI-UHFFFAOYSA-N 2,3,9,10-tetramethoxy-6,8,13,13a-tetrahydro-5H-isoquinolino[2,1-b]isoquinoline Chemical compound C1CN2CC(C(=C(OC)C=C3)OC)=C3CC2C2=C1C=C(OC)C(OC)=C2 AEQDJSLRWYMAQI-UHFFFAOYSA-N 0.000 description 4
- 238000004090 dissolution Methods 0.000 description 4
- 230000009467 reduction Effects 0.000 description 4
- 239000000176 sodium gluconate Substances 0.000 description 4
- 229940005574 sodium gluconate Drugs 0.000 description 4
- 235000012207 sodium gluconate Nutrition 0.000 description 4
- 238000005265 energy consumption Methods 0.000 description 3
- 239000000126 substance Substances 0.000 description 3
- IRLPACMLTUPBCL-KQYNXXCUSA-N 5'-adenylyl sulfate Chemical compound C1=NC=2C(N)=NC=NC=2N1[C@@H]1O[C@H](COP(O)(=O)OS(O)(=O)=O)[C@@H](O)[C@H]1O IRLPACMLTUPBCL-KQYNXXCUSA-N 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 239000004568 cement Substances 0.000 description 2
- 230000006872 improvement Effects 0.000 description 2
- 229910052500 inorganic mineral Inorganic materials 0.000 description 2
- 239000011707 mineral Substances 0.000 description 2
- 235000010755 mineral Nutrition 0.000 description 2
- DGVVJWXRCWCCOD-UHFFFAOYSA-N naphthalene;hydrate Chemical compound O.C1=CC=CC2=CC=CC=C21 DGVVJWXRCWCCOD-UHFFFAOYSA-N 0.000 description 2
- 239000000843 powder Substances 0.000 description 2
- 239000004576 sand Substances 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 150000003751 zinc Chemical class 0.000 description 2
- 101100353526 Neurospora crassa (strain ATCC 24698 / 74-OR23-1A / CBS 708.71 / DSM 1257 / FGSC 987) pca-2 gene Proteins 0.000 description 1
- ZOIORXHNWRGPMV-UHFFFAOYSA-N acetic acid;zinc Chemical compound [Zn].CC(O)=O.CC(O)=O ZOIORXHNWRGPMV-UHFFFAOYSA-N 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 239000004566 building material Substances 0.000 description 1
- 238000009833 condensation Methods 0.000 description 1
- 230000005494 condensation Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 229920002521 macromolecule Polymers 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000011056 performance test Methods 0.000 description 1
- 239000002986 polymer concrete Substances 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 230000003014 reinforcing effect Effects 0.000 description 1
- 230000000979 retarding effect Effects 0.000 description 1
- 239000004575 stone Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 238000003786 synthesis reaction Methods 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
- 239000004246 zinc acetate Substances 0.000 description 1
- NWONKYPBYAMBJT-UHFFFAOYSA-L zinc sulfate Chemical compound [Zn+2].[O-]S([O-])(=O)=O NWONKYPBYAMBJT-UHFFFAOYSA-L 0.000 description 1
- 229960001763 zinc sulfate Drugs 0.000 description 1
- 229910000368 zinc sulfate Inorganic materials 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B40/00—Processes, in general, for influencing or modifying the properties of mortars, concrete or artificial stone compositions, e.g. their setting or hardening ability
- C04B40/0028—Aspects relating to the mixing step of the mortar preparation
- C04B40/0039—Premixtures of ingredients
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
- Compositions Of Macromolecular Compounds (AREA)
- Addition Polymer Or Copolymer, Post-Treatments, Or Chemical Modifications (AREA)
Abstract
The invention discloses a special additive for concrete of an assembled prefabricated part and a preparation method thereof, wherein the additive comprises the following raw materials in percentage by mass: foam stabilizing component 0.02-0.1%; 20-25% of an early-strength viscosity-reduction type polycarboxylate superplasticizer; 0.5 to 2.5 percent of concrete retention agent; 0.5 to 1.5 percent of viscosity-reducing and water-retaining component; 1.5-3% of cementing material excitation component; 0.2 to 0.7 percent of anti-sticking film component; the balance being water. The special additive for the concrete of the prefabricated component does not contain formaldehyde, is non-corrosive, has low air content, good foam stabilizing performance, good working performance of the concrete, moderate viscosity, no bleeding and high early strength, and has smooth surface without bubbles and no corner drop after the component is demoulded.
Description
Technical Field
The invention relates to the technical field of building materials, in particular to a concrete special additive for an assembly type prefabricated part and a preparation method thereof.
Background
In recent years, the country actively pushes and develops the prefabricated concrete structure, the development of the prefabricated buildings is the national policy of the building industry of China, the requirement of the Ministry of housing and construction reaches more than 15% of the proportion of the national prefabricated buildings in newly-built buildings by 2020, more than 50 prefabricated building demonstration cities, more than 200 prefabricated building industry bases and more than 500 prefabricated building demonstration projects are cultivated. Compared with cast-in-place concrete, the construction mode of the prefabricated member has the advantages of high construction speed, labor saving, avoidance of cast-in-place construction accidents, improvement of field construction environment, high quality and precision of the member and the like, so that the prefabricated member is more and more concerned by the construction industry. The prefabricated member concrete for the prefabricated building has the advantages of high required strength, flat and smooth surface and uniform color, and on the basis, the prefabricated member concrete for the prefabricated building has the advantages of high early strength, short condensation, high workability and high operation rate of a template. In order to achieve the indexes of prefabricated components, component enterprises almost improve the consumption of the cementing materials, add early strength agents, steam-cure autoclaving and the like, and the profits of the enterprises are further compressed.
In Chinese patents CN 102786248A, CN 107056120A and CN 107602781A, AMPS is introduced to improve the early strength of the polycarboxylate water reducer, and the introduction of AMPS not only reduces the early strength but also reduces the water reducing rate of the polycarboxylate water reducer, but also only improves the wrapping performance; in the chinese patent CN 103965416 a, the method of increasing the length of the side chain is adopted to improve the early strength of the concrete, and the increase of the length of the side chain increases the viscosity of the concrete, which affects the workability. Chinese patent CN 108558261A discloses that zinc salt such as zinc sulfate and zinc acetate is used for resisting concrete bleeding, but the zinc salt belongs to retarder and is unfavorable for early strength. The Chinese patent CN 109485323A introduces quaternary ammonium salt in the side chain to improve the early strength of the concrete and reduce the viscosity, but the synthesis process is complex and the energy consumption is high.
Therefore, the preparation of the special additive which is favorable for the early strength, the working performance (viscosity and workability), the apparent state, the energy consumption and the durability of the prefabricated member concrete plays an important role in the popularization and the application of the additive in the prefabricated member concrete industry.
Disclosure of Invention
Aiming at the problems in the prior art, the invention provides the special additive for the concrete of the prefabricated part and the preparation method thereof, so that the concrete has low air content, good foam stabilizing performance, good working performance of the concrete, moderate viscosity, no bleeding, high early strength, smooth surface without bubbles after the part is demoulded, no sticking to a mould and no corner falling.
In order to achieve the above purpose, the invention is realized by the following technical scheme:
the special additive for the concrete of the prefabricated part consists of the following raw materials in percentage by mass:
compared with the prior art, the additive adopting the technical scheme has the beneficial effects that:
1) the admixture prepared by the invention can ensure that the precast member concrete has low air content, good foam stabilizing performance, good working performance, moderate viscosity, no bleeding and high early strength, the surface of the member is smooth and has no bubbles after being demoulded, the member does not stick a mould and does not drop corners, the breakage rate of the precast member is reduced, the energy consumption is reduced, and the use efficiency of the mould is improved.
2) The additive prepared by the invention adopts a pollution-free polycarboxylic acid water reducing agent to replace a second-generation water reducing agent represented by a naphthalene water reducing agent containing formaldehyde and other harmful substances, has no corrosivity, reduces environmental pollution, is beneficial to further popularization and application of the polycarboxylic acid water reducing agent in the assembled prefabricated part industry, and gradually eliminates the naphthalene water reducing agent containing formaldehyde and other harmful substances.
Further, the foam stabilizing component is a Gemini Gemini quaternary ammonium salt type foam stabilizing component, and the molecular structural general formula is as follows:
wherein m is 12 or 14, and A is-CH 2-CH 2-or-CH 2-CH (OH) -CH 2-.
Further, the viscosity-average molecular weight of the early-strength viscosity-reduction type polycarboxylate superplasticizer is 30000-50000, the mass concentration is 50%, and the molecular structure general formula is as follows:
wherein a, b, c is 4-6:0.5-1: 1;
in the formula R1Is H or CH3，R2is-CH2CH2-or-OCH2CH2CH2CH2-，R3Is composed of
Or
n＝40-65；
Wherein M is K+Or
Further, the concrete retention agent is an acrylic acid/acrylamide copolymer, the viscosity-average molecular weight is 6000-12000, the mass concentration is 30%, and the general formula of the molecular structure is as follows:
wherein e is 4-6: 1.
Further, the viscosity-reducing and water-retaining component is an acrylic acid/acrylamide/2-acrylamido-2-methylpropanesulfonic acid copolymer, the viscosity average molecular weight is 80000-110000, the mass concentration is 20%, and the molecular structure general formula is:
wherein g: h: j ═ 2-3:1: 1-2.
Further, the activating component of the cementing material is lithium nitrate or lithium sulfate.
Further, the anti-sticking film component is acrylic acid/2-acrylamide-2-methylpropanesulfonic acid copolymer, the viscosity average molecular weight is 200000-:
wherein r: s is 2-4: 1.
The preparation method of the special additive for the concrete of the prefabricated part comprises the following steps:
weighing the components according to a ratio;
step two, adding deionized water into the stirring kettle, adding the cementing material excitation component, and stirring for dissolving;
step three, adding the early-strength viscosity-reduction type polycarboxylate superplasticizer, a concrete retaining agent, a viscosity-reduction water-retention component and an anti-adhesion film component into the solution prepared in the step two, and stirring for dissolving;
and step three, adding the foam stabilizing component into the solution prepared in the step three, and stirring until the foam stabilizing component is fully mixed to obtain the special concrete admixture for the prefabricated part.
Detailed Description
In order that those skilled in the art will better understand the present invention, the following detailed description will be given for clear and complete description of the technical solution of the present invention.
Example 1
Adding 77.28 parts of deionized water into a stirring kettle, adding 1.5 parts of lithium nitrate, stirring for dissolving, adding 20 parts of early-strength viscosity-reduction type polycarboxylate superplasticizer, 0.5 part of concrete retention agent, 0.5 part of viscosity-reduction water-retention component and 0.2 part of anti-sticking film component, stirring for dissolving, finally adding 0.02 part of foam stabilizing component, stirring for 5 minutes, and fully mixing to obtain the additive product LYGP-1 special for the prefabricated member concrete.
Wherein, the foam stabilizing component is a Gemini Gemini quaternary ammonium salt type, and the molecular structure general formula is as follows:
wherein m is 12, and A is-CH 2-CH 2-.
The viscosity average molecular weight of the early-strength viscosity-reduction type polycarboxylate superplasticizer is 30222, the mass concentration is 50%, and the molecular structural general formula is as follows:
wherein a, b, c and c are 4:0.5:1, R1 is H, R2 is-CH 2CH2-, and R3 is
n is 40 and M is K +.
The concrete retention agent is an acrylic acid/acrylamide copolymer, the viscosity-average molecular weight of the concrete retention agent is 6023, the mass concentration of the concrete retention agent is 30 percent, and the general formula of the molecular structure is as follows:
wherein e: f is 4: 1.
The viscosity-reducing and water-retaining component is an acrylic acid/acrylamide/2-acrylamide-2-methylpropanesulfonic acid copolymer, the viscosity-average molecular weight is 80123, the mass concentration is 20%, and the molecular structural general formula is as follows:
wherein g: h: j ═ 2:1: 1.
The anti-sticking film component is acrylic acid/2-acrylamide-2-methyl propanesulfonic acid copolymer, the viscosity average molecular weight is 200154, the mass concentration is 10%, and the molecular structural general formula is as follows:
wherein r: s is 2: 1.
Example 2
Adding 67.2 parts of deionized water into a stirring kettle, adding 3 parts of lithium sulfate, stirring and dissolving, then adding 25 parts of early-strength viscosity-reduction type polycarboxylate superplasticizer, 2.5 parts of concrete retention agent, 1.5 parts of viscosity-reduction water-retention component and 0.7 part of anti-sticking film component, stirring and dissolving, finally adding 0.1 part of foam stabilizing component, stirring for 5 minutes, and fully mixing to obtain the prefabricated member concrete special additive product LYGP-2 for the assembly type building.
Wherein the foam stabilizing component is a Gemini Gemini quaternary ammonium salt type, and the molecular structure general formula is as follows:
wherein m is 12 and A is-CH 2-CH (OH) -CH 2-.
The viscosity-average molecular weight of the early-strength viscosity-reduction polycarboxylate superplasticizer is 50150, the mass concentration is 50%, and the molecular structure general formula is as follows:
wherein a, b, c, is 6:1:1, R1 is CH3, R2 is-OCH 2CH2CH2CH2-, and R3 is
n is 65 and M is
The concrete retention agent is an acrylic acid/acrylamide copolymer, the viscosity-average molecular weight of the concrete retention agent is 12032, the mass concentration of the concrete retention agent is 30%, and the general formula of the molecular structure is as follows:
wherein e is 6: 1.
The viscosity-reducing and water-retaining component is acrylic acid/acrylamide/2-acrylamide-2-methyl propanesulfonic acid copolymer, the viscosity average molecular weight is 110077, the mass concentration is 20%, and the molecular structural general formula is as follows:
wherein g: h: j ═ 3:1: 2.
The anti-sticking film component is acrylic acid/2-acrylamide-2-methyl propanesulfonic acid copolymer, the viscosity average molecular weight is 300129, the mass concentration is 10%, and the molecular structural general formula is as follows:
wherein r: s is 4: 1.
Example 3
Adding 72.95 parts of deionized water into a stirring kettle, adding 2 parts of lithium sulfate, stirring and dissolving, then adding 22 parts of early-strength viscosity-reduction type polycarboxylate superplasticizer, 1.5 parts of concrete retention agent, 1 part of viscosity-reduction water-retention component and 0.5 part of anti-sticking film component, stirring and dissolving, finally adding 0.05 part of foam stabilizing component, stirring for 5 minutes, and fully mixing to obtain the prefabricated member concrete special additive product LYGP-3 for the assembly type building.
Wherein the foam stabilizing component is a Gemini Gemini quaternary ammonium salt type, and the molecular structure general formula is as follows:
wherein m is 14 and A is-CH 2-CH 2-.
The viscosity-average molecular weight of the early-strength viscosity-reduction polycarboxylate superplasticizer is 45433, the mass concentration is 50%, and the molecular structural general formula is as follows:
wherein a, b, c is 5:1:1, R1 is CH3, R2 is-CH 2CH2-, and R3 is
n is 50 and M is
The concrete retention agent is an acrylic acid/acrylamide copolymer, the viscosity-average molecular weight of the concrete retention agent is 9322, the mass concentration of the concrete retention agent is 30%, and the structural general formula is as follows:
wherein e: f is 5: 1.
The viscosity-reducing and water-retaining component is acrylic acid/acrylamide/2-acrylamide-2-methyl propanesulfonic acid copolymer, the viscosity average molecular weight is 90040, the mass concentration is 20%, and the molecular structural general formula is as follows:
wherein g: h: j ═ 2.5:1: 1.5.
The anti-sticking film component is acrylic acid/2-acrylamide-2-methyl propanesulfonic acid copolymer, the viscosity average molecular weight is 250005, the mass concentration is 10%, and the molecular structural general formula is as follows:
wherein r: s is 3: 1.
Example 4
Adding 72.05 parts of deionized water into a stirring kettle, adding 2.5 parts of lithium nitrate, stirring for dissolving, adding 22 parts of early-strength viscosity-reduction type polycarboxylate superplasticizer, 2 parts of concrete retention agent, 1 part of viscosity-reduction water-retention component and 0.4 part of anti-sticking film component, stirring for dissolving, finally adding 0.05 part of foam stabilizing component, stirring for 5 minutes, and fully mixing to obtain the prefabricated member concrete special additive product LYGP-4 for the assembly type building.
Wherein the foam stabilizing component is a Gemini Gemini quaternary ammonium salt type, and the molecular structure general formula is as follows:
wherein m is 14 and A is-CH 2-CH (OH) -CH 2-.
The viscosity average molecular weight of the early-strength viscosity-reduction type polycarboxylate superplasticizer is 36788, the mass concentration is 50%, and the molecular structural general formula is as follows:
wherein a, b, c and c are 5:0.5:1, R1 is CH3, R2 is-OCH 2CH2CH2CH2-, and R3 is
n is 60, and M is K +;
the concrete retention agent is an acrylic acid/acrylamide copolymer, the viscosity-average molecular weight of the concrete retention agent is 11000, the mass concentration of the concrete retention agent is 30%, and the structural general formula is as follows:
wherein e is 6: 1.
The viscosity-reducing and water-retaining component is acrylic acid/acrylamide/2-acrylamide-2-methyl propanesulfonic acid copolymer, the viscosity average molecular weight is 101352, the mass concentration is 20%, and the molecular structural general formula is as follows:
wherein g: h: j ═ 3:1:1.
The anti-sticking film component is acrylic acid/2-acrylamide-2-methyl propanesulfonic acid copolymer, the viscosity average molecular weight is 279870, the mass concentration is 10%, and the molecular structural general formula is as follows:
wherein r: s is 3: 1.
Example 5
Adding 71.5 parts of deionized water into a stirring kettle, adding 1.5 parts of lithium nitrate, stirring for dissolving, adding 23 parts of early-strength viscosity-reduction type polycarboxylate superplasticizer, 2 parts of concrete retention agent, 1.5 parts of viscosity-reduction water-retention component and 0.4 part of anti-sticking film component, stirring for dissolving, finally adding 0.1 part of foam stabilizing component, stirring for 5 minutes, and fully mixing to obtain the prefabricated member concrete special additive product LYGP-5 for the assembly type building.
Wherein the foam stabilizing component is a Gemini Gemini quaternary ammonium salt type, and the molecular structure general formula is as follows:
wherein m is 12 and A is-CH 2-CH (OH) -CH 2-.
The viscosity average molecular weight of the early-strength viscosity-reduction type polycarboxylate superplasticizer is 43554, the mass concentration is 50 percent, and the molecular structural general formula is as follows:
wherein a, b, c and c are 5.5:0.5:1, R1 is H, R2 is-CH 2CH 2-R3 is
n is 55 and M is
The concrete retention agent is an acrylic acid/acrylamide copolymer, the viscosity-average molecular weight of the concrete retention agent is 8040, the mass concentration of the concrete retention agent is 30%, and the general formula of the molecular structure is as follows:
wherein e is 6: 1.
The viscosity-reducing and water-retaining component is acrylic acid/acrylamide/2-acrylamide-2-methyl propanesulfonic acid copolymer, the viscosity average molecular weight is 96080, the mass concentration is 20%, and the molecular structural general formula is as follows:
wherein g: h: j ═ 3:1: 1.5.
The anti-sticking film component is acrylic acid/2-acrylamide-2-methyl propanesulfonic acid copolymer, the viscosity average molecular weight is 290443, the mass concentration is 10%, and the molecular structural general formula is as follows:
wherein r: s is 2: 1.
Example 6
71.13 parts of deionized water is added into a stirring kettle, 3 parts of lithium sulfate is added, after stirring and dissolution, 23 parts of early strength viscosity reduction type polycarboxylate superplasticizer, 1.5 parts of concrete retention agent, 1 part of viscosity reduction water retention component and 0.3 part of anti-sticking film component are added, stirring and dissolution are carried out, finally 0.07 part of foam stabilizing component is added, stirring is carried out for 5 minutes, and full mixing is carried out, thus obtaining the admixture product LYGP-6 special for prefabricated member concrete for assembly type buildings.
Wherein the foam stabilizing component is a Gemini Gemini quaternary ammonium salt type, and the molecular structure general formula is as follows:
wherein m is 14 and A is-CH 2-CH 2-.
The viscosity-average molecular weight of the early-strength viscosity-reduction type polycarboxylate superplasticizer is 40332, the mass concentration is 50%, and the molecular structural general formula is as follows:
wherein a, b, c and c are 6, 0.5, 1, R1 is CH3, R2 is-OCH 2CH2CH2CH2-, and R3 is
n is 60 and M is K +.
The concrete retention agent is an acrylic acid/acrylamide copolymer, the viscosity average molecular weight of the concrete retention agent is 9833, the mass concentration of the concrete retention agent is 30%, and the molecular structural general formula is as follows:
wherein e: f is 5: 1.
The viscosity-reducing and water-retaining component is acrylic acid/acrylamide/2-acrylamide-2-methyl propanesulfonic acid copolymer, the viscosity average molecular weight is 87564, the mass concentration is 20%, and the molecular structural general formula is as follows:
wherein g: h: j ═ 3:1: 2.
The anti-sticking film component is acrylic acid/2-acrylamide-2-methyl propanesulfonic acid copolymer, the viscosity average molecular weight is 232098, the mass concentration is 10%, and the molecular structural general formula is as follows:
wherein r: s is 4: 1.
Example 7
73.26 parts of deionized water is added into a stirring kettle, 2 parts of lithium sulfate is added, after stirring and dissolution, 21 parts of early strength viscosity reduction type polycarboxylate superplasticizer, 2 parts of concrete retention agent, 1 part of viscosity reduction water retention component and 0.7 part of anti-sticking film component are added, stirring and dissolution are carried out, finally 0.04 part of foam stabilizing component is added, stirring is carried out for 5 minutes, and full mixing is carried out, thus obtaining the admixture product LYGP-7 special for prefabricated member concrete for assembly type buildings.
Wherein the foam stabilizing component is a Gemini Gemini quaternary ammonium salt type, and the molecular structure general formula is as follows:
wherein m is 14 and A is-CH 2-CH 2-.
The viscosity average molecular weight of the early-strength viscosity-reduction type polycarboxylate superplasticizer is 43453, the mass concentration is 50%, and the molecular structure general formula is as follows:
wherein a, b, c, is 6:1:1, R1 is CH3, R2 is-CH 2CH2-, and R3 is
n is 45 and M is
The concrete retention agent is an acrylic acid/acrylamide copolymer, the viscosity-average molecular weight of the concrete retention agent is 7688, the mass concentration of the concrete retention agent is 30%, and the general formula of the molecular structure is as follows:
wherein e: f is 5: 1.
The viscosity-reducing and water-retaining component is acrylic acid/acrylamide/2-acrylamide-2-methyl propanesulfonic acid copolymer, the viscosity average molecular weight is 90879, the mass concentration is 20%, and the molecular structural general formula is as follows:
wherein g: h: j ═ 2:1: 2.
The anti-sticking film component is acrylic acid/2-acrylamide-2-methyl propanesulfonic acid copolymer, the viscosity average molecular weight is 276856, the mass concentration is 10%, and the molecular structural general formula is as follows:
wherein r: s is 4: 1.
Comparative example 1
And adding 22 parts of common polycarboxylic acid water reducing agent and 1 part of sodium gluconate into the stirring kettle, and stirring for 15min to obtain the common concrete admixture product PCA-1.
Wherein the viscosity average molecular weight of the common polycarboxylic acid water reducing agent is 56700, and the mass concentration is 50%. The molecular structural formula is as follows:
x:y＝5:1。
comparative example 2
And adding 25 parts of common polycarboxylic acid water reducing agent and 2 parts of sodium gluconate into the stirring kettle, and stirring for 15min to obtain the common concrete admixture product PCA-2.
Wherein the viscosity average molecular weight of the common polycarboxylic acid water reducing agent is 56800, and the mass concentration is 50%. The molecular structural formula is as follows:
x:y＝5:1。
the implementation effect is as follows:
the admixture in each of the above examples and comparative examples is applied to the concrete of a C30 prefabricated wallboard component and a comparative experiment is carried out, wherein the mixing ratio of the concrete of the C30 prefabricated wallboard component is cement: mineral powder: sand: stone: water 340: 20: 850: 1045: 145. wherein the cement is Jidong P.O 42.5.5, the mineral powder is S95 grade, the fineness modulus of the sand is 2.2, and the pebble is 5-20mm in continuous reading grade. The admixture content was 0.2%, and concrete using the admixtures of examples and comparative examples was tested for workability, air content, compressive strength values at room temperature for curing for 12 hours, 24 hours and 72 hours, and post-demolded state of the members, and the specific test results are shown in Table 1.
TABLE 1 concrete Performance test results
It can be seen from the relevant data in table 1 that, compared with the admixture prepared from the common polycarboxylic acid water reducing agent and sodium gluconate, the admixture special for the prefabricated member concrete prepared from the foam stabilizing component, the early-strength viscosity-reduction polycarboxylic acid water reducing agent, the concrete retaining agent, the viscosity-reduction water-retention component, the cementing material excitation component and the anti-sticking film component has the advantages of good reinforcing performance, obvious improvement of the compressive strength of the concrete under the room-temperature curing condition for 16h, 24h and 72h, low air content of the prepared prefabricated member concrete, good foam stabilizing performance, good concrete workability, moderate viscosity, no bleeding, smooth surface, no bubbles and no corner drop of the anti-sticking film after the member is demoulded. The main reasons are as follows: 1. the water reducing agent adopted by the invention is an early-strength viscosity-reduction type polycarboxylate water reducing agent, so that the early strength of the concrete is improved; 2. the invention adopts the high-performance Gemini Gemini quaternary ammonium salt type foam stabilizing component, can introduce small bubbles and effectively stabilize harmless bubbles in a concrete system, can reduce the viscosity of concrete and improve the working performance, and can ensure that the surface of a concrete prefabricated part is smooth, bright and free of bubbles after being demoulded; 3. the invention introduces the macromolecule anti-sticking film component, so that the component is not stuck to the mold, the damage rate of the component is greatly reduced, the mold test is not polluted and damaged, the cost is further reduced, and the construction waste discharge is reduced; 4. compared with a micromolecule retarding substance (sodium gluconate), the polymer concrete retention agent has linearly controllable setting time and fluidity and acting force on the concrete, and effectively reduces the possibility of larger fluctuation of component strength and working performance of the concrete caused by larger fluctuation of raw materials.
In conclusion, the special additive has the advantages of obviously improving the early strength and the construction performance of the prefabricated member concrete for the fabricated building and the appearance performance of the member after hardening, and is suitable for great popularization and application.
Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art within the scope of the present invention.
Claims (6)
1. The special additive for the concrete of the prefabricated part is characterized by comprising the following raw materials in percentage by mass:
the balance of water;
the foam stabilizing component is a Gemini Gemini quaternary ammonium salt type foam stabilizing component, and the molecular structural general formula is as follows:
wherein m is 12 or 14, a is-CH 2-CH 2-or-CH 2-CH (oh) -CH 2-;
the viscosity average molecular weight of the early-strength viscosity-reduction type polycarboxylate superplasticizer is 30000-50000, the mass concentration is 50%, and the molecular structure general formula is as follows:
wherein a, b, c is 4-6:0.5-1: 1;
in the formula R1Is H or CH3，R2is-CH2CH2-or-OCH2CH2CH2CH2-，R3Is composed of
n＝40-65；
Wherein M is K+Or
2. The admixture special for the prefabricated concrete member of claim 1, wherein the concrete retention agent is an acrylic acid/acrylamide copolymer, the viscosity-average molecular weight is 6000-12000, the mass concentration is 30%, and the molecular structural formula is:
wherein e is 4-6: 1.
3. The admixture special for the prefabricated member concrete as claimed in claim 1, wherein the viscosity-reducing and water-retaining component is an acrylic acid/acrylamide/2-acrylamido-2-methylpropanesulfonic acid copolymer, the viscosity-average molecular weight is 80000-110000, the mass concentration is 20%, and the molecular structural formula is:
wherein g: h: j ═ 2-3:1: 1-2.
4. The admixture special for prefabricated concrete members according to claim 1, wherein the cementitious material activating component is lithium nitrate or lithium sulfate.
5. The admixture special for the assembly type precast member concrete according to claim 1, wherein the anti-sticking film component is acrylic acid/2-acrylamido-2-methylpropanesulfonic acid copolymer having a viscosity average molecular weight of 200000-300000 and a mass concentration of 10%, and has a molecular structural formula:
wherein r: s is 2-4: 1.
6. A method for preparing the concrete special additive for the prefabricated parts according to any one of claims 1 to 5, which is characterized by comprising the following steps:
weighing the components according to a ratio;
step two, adding deionized water into the stirring kettle, adding the cementing material excitation component, and stirring for dissolving;
step three, adding the early-strength viscosity-reduction type polycarboxylate superplasticizer, a concrete retaining agent, a viscosity-reduction water-retention component and an anti-adhesion film component into the solution prepared in the step two, and stirring for dissolving;
and step three, adding the foam stabilizing component into the solution prepared in the step three, and stirring until the foam stabilizing component is fully mixed to obtain the special concrete admixture for the prefabricated part.
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