CN110950586A - Concrete aerated block and preparation method thereof - Google Patents
Concrete aerated block and preparation method thereof Download PDFInfo
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- CN110950586A CN110950586A CN201911026273.2A CN201911026273A CN110950586A CN 110950586 A CN110950586 A CN 110950586A CN 201911026273 A CN201911026273 A CN 201911026273A CN 110950586 A CN110950586 A CN 110950586A
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- 239000004567 concrete Substances 0.000 title claims abstract description 72
- 238000002360 preparation method Methods 0.000 title abstract description 8
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 32
- 239000002002 slurry Substances 0.000 claims abstract description 25
- 239000000835 fiber Substances 0.000 claims abstract description 23
- 239000002994 raw material Substances 0.000 claims abstract description 21
- 239000004568 cement Substances 0.000 claims abstract description 20
- 229910000519 Ferrosilicon Inorganic materials 0.000 claims abstract description 17
- 239000000843 powder Substances 0.000 claims abstract description 17
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims abstract description 16
- 235000008733 Citrus aurantifolia Nutrition 0.000 claims abstract description 14
- 235000011941 Tilia x europaea Nutrition 0.000 claims abstract description 14
- 239000004571 lime Substances 0.000 claims abstract description 14
- 239000003638 chemical reducing agent Substances 0.000 claims abstract description 13
- 239000002253 acid Substances 0.000 claims abstract description 11
- QQONPFPTGQHPMA-UHFFFAOYSA-N propylene Natural products CC=C QQONPFPTGQHPMA-UHFFFAOYSA-N 0.000 claims abstract description 8
- 125000004805 propylene group Chemical group [H]C([H])([H])C([H])([*:1])C([H])([H])[*:2] 0.000 claims abstract description 8
- 239000010702 perfluoropolyether Substances 0.000 claims description 28
- 238000002156 mixing Methods 0.000 claims description 25
- 241001122767 Theaceae Species 0.000 claims description 19
- 239000001397 quillaja saponaria molina bark Substances 0.000 claims description 19
- 229930182490 saponin Natural products 0.000 claims description 19
- 150000007949 saponins Chemical class 0.000 claims description 19
- 238000005187 foaming Methods 0.000 claims description 14
- 239000010440 gypsum Substances 0.000 claims description 13
- 229910052602 gypsum Inorganic materials 0.000 claims description 13
- 239000004576 sand Substances 0.000 claims description 12
- 238000000034 method Methods 0.000 claims description 11
- 238000000465 moulding Methods 0.000 claims description 10
- 238000003756 stirring Methods 0.000 claims description 10
- HDETVIAMQNTONT-UHFFFAOYSA-N C[SiH2]O.[Na] Chemical compound C[SiH2]O.[Na] HDETVIAMQNTONT-UHFFFAOYSA-N 0.000 claims description 6
- 238000005520 cutting process Methods 0.000 claims description 5
- GBPOWOIWSYUZMH-UHFFFAOYSA-N sodium;trihydroxy(methyl)silane Chemical compound [Na+].C[Si](O)(O)O GBPOWOIWSYUZMH-UHFFFAOYSA-N 0.000 claims description 5
- 238000006116 polymerization reaction Methods 0.000 claims description 2
- -1 polypropylene Polymers 0.000 abstract description 17
- 239000004743 Polypropylene Substances 0.000 abstract description 12
- 229920001155 polypropylene Polymers 0.000 abstract description 12
- 239000011148 porous material Substances 0.000 abstract description 9
- 238000005336 cracking Methods 0.000 abstract description 8
- 230000000694 effects Effects 0.000 abstract description 7
- 238000001179 sorption measurement Methods 0.000 abstract description 7
- 229920005646 polycarboxylate Polymers 0.000 abstract description 5
- 230000007547 defect Effects 0.000 abstract description 4
- 238000001035 drying Methods 0.000 abstract description 4
- 230000002411 adverse Effects 0.000 abstract description 3
- 239000004566 building material Substances 0.000 abstract description 3
- 230000035699 permeability Effects 0.000 abstract description 3
- 239000004033 plastic Substances 0.000 abstract description 3
- 230000009467 reduction Effects 0.000 abstract description 3
- 230000003014 reinforcing effect Effects 0.000 abstract description 3
- 239000008030 superplasticizer Substances 0.000 abstract description 3
- 239000007789 gas Substances 0.000 description 15
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 14
- 230000008569 process Effects 0.000 description 9
- 238000006703 hydration reaction Methods 0.000 description 5
- 230000009286 beneficial effect Effects 0.000 description 4
- 239000006185 dispersion Substances 0.000 description 4
- 230000002209 hydrophobic effect Effects 0.000 description 4
- 239000000463 material Substances 0.000 description 4
- 239000002245 particle Substances 0.000 description 4
- 229920001296 polysiloxane Polymers 0.000 description 4
- SCPYDCQAZCOKTP-UHFFFAOYSA-N silanol Chemical compound [SiH3]O SCPYDCQAZCOKTP-UHFFFAOYSA-N 0.000 description 4
- 239000000126 substance Substances 0.000 description 4
- 238000012360 testing method Methods 0.000 description 4
- JQQMGDZAJQTYQC-UHFFFAOYSA-N [Na+].C[SiH2][O-] Chemical compound [Na+].C[SiH2][O-] JQQMGDZAJQTYQC-UHFFFAOYSA-N 0.000 description 3
- 238000010521 absorption reaction Methods 0.000 description 3
- AXCZMVOFGPJBDE-UHFFFAOYSA-L calcium dihydroxide Chemical compound [OH-].[OH-].[Ca+2] AXCZMVOFGPJBDE-UHFFFAOYSA-L 0.000 description 3
- 239000000920 calcium hydroxide Substances 0.000 description 3
- 229910001861 calcium hydroxide Inorganic materials 0.000 description 3
- 238000006243 chemical reaction Methods 0.000 description 3
- 239000002131 composite material Substances 0.000 description 3
- 238000001514 detection method Methods 0.000 description 3
- 239000006260 foam Substances 0.000 description 3
- 239000000203 mixture Substances 0.000 description 3
- MKTRXTLKNXLULX-UHFFFAOYSA-P pentacalcium;dioxido(oxo)silane;hydron;tetrahydrate Chemical compound [H+].[H+].O.O.O.O.[Ca+2].[Ca+2].[Ca+2].[Ca+2].[Ca+2].[O-][Si]([O-])=O.[O-][Si]([O-])=O.[O-][Si]([O-])=O.[O-][Si]([O-])=O.[O-][Si]([O-])=O.[O-][Si]([O-])=O MKTRXTLKNXLULX-UHFFFAOYSA-P 0.000 description 3
- 230000000087 stabilizing effect Effects 0.000 description 3
- RTZKZFJDLAIYFH-UHFFFAOYSA-N Diethyl ether Chemical compound CCOCC RTZKZFJDLAIYFH-UHFFFAOYSA-N 0.000 description 2
- 239000000654 additive Substances 0.000 description 2
- 230000000996 additive effect Effects 0.000 description 2
- 238000005189 flocculation Methods 0.000 description 2
- 230000016615 flocculation Effects 0.000 description 2
- 230000036571 hydration Effects 0.000 description 2
- 125000002887 hydroxy group Chemical group [H]O* 0.000 description 2
- 238000009413 insulation Methods 0.000 description 2
- 230000001050 lubricating effect Effects 0.000 description 2
- 239000002736 nonionic surfactant Substances 0.000 description 2
- 238000004321 preservation Methods 0.000 description 2
- 230000001737 promoting effect Effects 0.000 description 2
- 238000010998 test method Methods 0.000 description 2
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 description 1
- DGAQECJNVWCQMB-PUAWFVPOSA-M Ilexoside XXIX Chemical compound C[C@@H]1CC[C@@]2(CC[C@@]3(C(=CC[C@H]4[C@]3(CC[C@@H]5[C@@]4(CC[C@@H](C5(C)C)OS(=O)(=O)[O-])C)C)[C@@H]2[C@]1(C)O)C)C(=O)O[C@H]6[C@@H]([C@H]([C@@H]([C@H](O6)CO)O)O)O.[Na+] DGAQECJNVWCQMB-PUAWFVPOSA-M 0.000 description 1
- BPQQTUXANYXVAA-UHFFFAOYSA-N Orthosilicate Chemical compound [O-][Si]([O-])([O-])[O-] BPQQTUXANYXVAA-UHFFFAOYSA-N 0.000 description 1
- 239000006004 Quartz sand Substances 0.000 description 1
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 1
- DBMJMQXJHONAFJ-UHFFFAOYSA-M Sodium laurylsulphate Chemical compound [Na+].CCCCCCCCCCCCOS([O-])(=O)=O DBMJMQXJHONAFJ-UHFFFAOYSA-M 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 1
- 238000013475 authorization Methods 0.000 description 1
- 239000011575 calcium Substances 0.000 description 1
- 229910052791 calcium Inorganic materials 0.000 description 1
- 239000000378 calcium silicate Substances 0.000 description 1
- 229910052918 calcium silicate Inorganic materials 0.000 description 1
- OYACROKNLOSFPA-UHFFFAOYSA-N calcium;dioxido(oxo)silane Chemical compound [Ca+2].[O-][Si]([O-])=O OYACROKNLOSFPA-UHFFFAOYSA-N 0.000 description 1
- XFWJKVMFIVXPKK-UHFFFAOYSA-N calcium;oxido(oxo)alumane Chemical compound [Ca+2].[O-][Al]=O.[O-][Al]=O XFWJKVMFIVXPKK-UHFFFAOYSA-N 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 239000000460 chlorine Substances 0.000 description 1
- 229910052801 chlorine Inorganic materials 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 238000010790 dilution Methods 0.000 description 1
- 239000012895 dilution Substances 0.000 description 1
- KPUWHANPEXNPJT-UHFFFAOYSA-N disiloxane Chemical class [SiH3]O[SiH3] KPUWHANPEXNPJT-UHFFFAOYSA-N 0.000 description 1
- 230000002708 enhancing effect Effects 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 229910000213 hydrogarnet Inorganic materials 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 125000004435 hydrogen atom Chemical class [H]* 0.000 description 1
- 238000001027 hydrothermal synthesis Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 description 1
- 239000012188 paraffin wax Substances 0.000 description 1
- 238000011056 performance test Methods 0.000 description 1
- 239000003208 petroleum Substances 0.000 description 1
- 230000036632 reaction speed Effects 0.000 description 1
- 230000035939 shock Effects 0.000 description 1
- 239000010703 silicon Substances 0.000 description 1
- 229910052710 silicon Inorganic materials 0.000 description 1
- 239000000377 silicon dioxide Substances 0.000 description 1
- 235000012239 silicon dioxide Nutrition 0.000 description 1
- 239000011734 sodium Substances 0.000 description 1
- 229910052708 sodium Inorganic materials 0.000 description 1
- 230000008719 thickening Effects 0.000 description 1
- 230000007306 turnover Effects 0.000 description 1
- 238000005303 weighing Methods 0.000 description 1
Images
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
- C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
- C04B28/02—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing hydraulic cements other than calcium sulfates
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
- C04B2201/50—Mortars, concrete or artificial stone characterised by specific physical values for the mechanical strength
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Inorganic Chemistry (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
- Porous Artificial Stone Or Porous Ceramic Products (AREA)
Abstract
The invention discloses a concrete aerated block and a preparation method thereof, relating to the technical field of building materials, wherein the concrete aerated block comprises the following raw materials, by weight, 2080-2100 parts of slurry; 230 portions and 260 portions of cement; 200 portions and 220 portions of lime; 1.0-1.5 parts of aluminum powder; 4-6 parts of ferrosilicon powder; 2-3 parts of propylene fiber; 10-15 parts of a polycarboxylic acid water reducing agent. The polypropylene fiber can be used as an anti-cracking fiber or a secondary reinforcing rib in concrete to overcome the defect of high brittleness of the concrete, and the polypropylene fiber can reduce the plastic shrinkage, drying shrinkage, permeability and early cracks of the concrete, but can also cause the reduction of the fluidity and the flow retentivity of the concrete. The polycarboxylate superplasticizer has an interface adsorption behavior on the surface of polypropylene fibers, and can effectively eliminate adverse effects on the fluidity and the flow retentivity of concrete. In addition, the polycarboxylic acid water reducing agent and the polypropylene fiber can obviously improve the pore structure of the concrete aerated block and reduce the cracking property of the concrete aerated block when being used together.
Description
Technical Field
The invention relates to the technical field of building materials, in particular to a concrete aerated block and a preparation method thereof.
Background
The concrete aerated block is also called aerated concrete block, and is a novel building material with light weight, porosity, heat preservation, heat insulation, good fireproof performance and certain shock resistance. It can be divided into non-bearing block, heat-insulating block, wall plate and roof plate according to their application.
A Chinese patent with an authorization publication number of CN102701659B discloses a B02-grade lightweight sand aerated concrete fireproof insulation board, which comprises the following raw material components in percentage by weight: 45-55% of quartz sand, 12-16% of lime, 24-37% of cement, 5% of gypsum, 0.25-0.35% of aluminum powder and 0.2-0.6% of composite additive; the composite additive comprises the following raw material components in percentage by weight: 25-30% of sodium rosinate, 22-26% of chlorinated paraffin, 24-28% of petroleum ether and 20-25% of organic siloxane.
The porosity of the aerated concrete is up to more than 70%, a plurality of air holes are distributed in the aerated concrete, the air holes are open and closed, fine cracks often exist among the air holes, meanwhile, capillary tubes are filled on the wall of the air holes, particularly on the wall of a big air hole, the aerated concrete can cause larger compression strain of materials due to the tension of the capillary tubes, and therefore cracks are easy to generate and need to be improved.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide a concrete aerated block which is not easy to crack.
In order to achieve the purpose, the invention provides the following technical scheme:
a concrete aerated block comprises the following raw materials, by weight, 2080-2100 parts of slurry; 230 portions and 260 portions of cement; 200 portions and 220 portions of lime; 1.0-1.5 parts of aluminum powder; 4-6 parts of ferrosilicon powder; 2-3 parts of propylene fiber; 10-15 parts of a polycarboxylic acid water reducing agent.
By adopting the technical scheme, the lime generates calcium hydroxide after hydration reaction, and the calcium hydroxide reacts with silicon dioxide and aluminum oxide in the siliceous material under the heating condition to generate calcium silicate hydrate and calcium aluminate hydrate, so that the aerated concrete product obtains strength. The lime has the other function of promoting the aluminum powder to generate gas, the aluminum powder gas generation needs alkaline conditions, the lime is digested in water to generate calcium hydroxide, the alkalinity of slurry is improved, and the alkaline conditions suitable for the aluminum powder gas generation are created. Lime can emit a large amount of heat when meeting water, the temperature can be raised by 60-70 ℃, the cement of the blank weight can be promoted to be rapidly hydrated, the blank body is promoted to be condensed and hardened, and the required standing time of the blank body is shortened. Therefore, the turnover period of the die can be shortened, the workshop area is reduced, the using amount of the die is reduced, and the cost is reduced.
Under the alkaline environment in the slurry, the aluminum powder is subjected to chemical reaction and releases hydrogen, and the slurry has certain strength due to thickening, so that the gas is prevented from overflowing, the gas forms uniform and fine bubbles in the aerated concrete slurry, and the aerated concrete has a porous structure after the slurry is hardened and condensed, thereby achieving the purpose of light weight. Due to the existence of a large number of closed air holes with gas performance, the heat conductivity coefficient of the aerated concrete is greatly reduced, so that the aerated concrete has a good heat preservation effect.
The reaction speed of the ferrosilicon powder and alkaline components in the slurry is slower than that of aluminum, in the process of composite gas generation, the gas generation of the ferrosilicon powder and aluminum powder is asynchronous, the ferrosilicon powder is similar to the action of a secondary gas generation agent, the shape of a gas hole generated by the gas generation of the ferrosilicon powder is accurate in positive orbit, the wall surface is more compact, and the inner surface of the ferrosilicon powder is not provided with inevitable lens-shaped cracks of the hole wall of the aluminum powder gas generation concrete. The addition of the ferrosilicon powder changes the pore structure of the aerated concrete and the crystal tissue liquid of the pore wall. The dispersed ferrosilicon powder can greatly increase the number of air holes of 0.1-1 mm. And the addition of the ferrosilicon powder changes the hole pattern of the aerated concrete, and more micropores are similar to a sphere, so that the micro-hole structure is more reasonable. In addition, after the ferrosilicon powder reacts, the generated free silicon creates conditions for forming Tobemolai low hydrated silicate, thereby effectively improving the strength of the aerated concrete.
The polycarboxylate water reducing agent can be adsorbed on the surface of cement particles to destroy the flocculation structure of the cement particles, so that the cement paste can keep good dispersion effect, and further improve the fluidity and the flow retentivity of the cement paste.
The polypropylene fiber can be used as an anti-cracking fiber or a secondary reinforcing rib in concrete to overcome the defect of high brittleness of the concrete, and the polypropylene fiber can reduce the plastic shrinkage, drying shrinkage, permeability and early cracks of the concrete, but can also cause the reduction of the fluidity and the flow retentivity of the concrete.
The polycarboxylate superplasticizer has an interface adsorption behavior on the surface of polypropylene fibers, and can effectively eliminate adverse effects on the fluidity and the flow retentivity of concrete. In addition, the polycarboxylic acid water reducing agent and the polypropylene fiber can obviously improve the pore structure of the concrete aerated block and reduce the cracking property of the concrete aerated block when being used together.
Further, the raw materials comprise 50-55 parts by weight of gypsum.
By adopting the technical scheme, gypsum is added into the aerated concrete and mainly used as a regulator, and the gypsum participates in cement hydration reaction, regulates the cement setting time, inhibits the slaking speed of lime and is beneficial to improving the stability of slurry pouring; the strength of the green body and the aerated concrete product is improved, and the shrinkage is reduced. The gypsum participates in hydration reaction in the process of standing and gas evolution to generate hydrated calcium sulphoaluminate and C-S-H gel, thereby improving the strength of the blank. In the autoclave curing process, gypsum plays a role in promoting the hydrothermal reaction, so that the tendency of C-S-H (B) to be converted into tobermorite is enhanced. Meanwhile, the gypsum can inhibit the reaction for generating hydrogarnet, promote free chlorine ions to be doped into C-S-H (B), and meanwhile, the alumina can promote the reaction for converting the C-S-H (B) into tobermorite and can prevent the tobermorite from being converted, so that the shrinkage value is reduced and the strength is improved.
Further, the raw material comprises 0.2-0.4 parts of sodium methyl silanol by weight.
By adopting the technical scheme, the sodium methyl silanol is doped into the slurry, and along with the hydration and hardening of the gel material, the slurry contains a large amount of alkaline substances to excite the sodium methyl silanol to be polycondensed into the polycondensed silanol, and the polycondensed silanol reacts with hydroxyl in the aerated concrete in a physical adsorption mode and a chemical adsorption mode to form polysiloxane, so that a net-shaped hydrophobic film is formed in the holes, and the existence of the polysiloxane on the walls of the aerated concrete holes enables the contact angle between water and the walls of the holes to be larger than 90 degrees, so that the water absorption rate of the aerated concrete is reduced.
Further, the raw materials comprise 2.5-3 parts by weight of perfluoropolyether, and the polymerization degree of the perfluoropolyether is less than 100.
By adopting the technical scheme, the perfluoropolyether has a good lubricating effect, can effectively improve the fluidity of a system, has good volatility, and can continuously volatilize in the foaming forming process, so that the concrete aerated block is more compact in a part without a hole structure and has stronger hardness and crack resistance.
In addition, the perfluoropolyether, the sodium methylsilanolate and the formed polysilicol have good compatibility, so that more perfluoropolyether is gathered on a reticular hydrophobic film formed in a hole, and capillaries on the wall of the hole are effectively reduced in the foaming forming process, so that the anti-cracking performance is further improved.
Furthermore, the raw material comprises 0.5 to 0.6 portion of tea saponin according to the weight portion.
By adopting the technical scheme, the tea saponin is a nonionic surfactant, so that the surface tension of an interface can be obviously reduced, a good foam stabilizing effect is achieved in the system gas forming process, and the combination and overflow of bubbles are effectively prevented; but also can improve the pore structure and increase the uniformity of pores, thereby being beneficial to improving the compressive strength of aerated concrete products.
The tea saponin can also improve the compatibility of the perfluoropolyether and a system, improve the dispersibility of the perfluoropolyether in the system, and ensure that the concrete aerated block is uniform and compact after being molded. Meanwhile, after the tea saponin improves the dispersion uniformity of the perfluoropolyether, the volatilization speed of the perfluoropolyether can be improved, and the compactness and uniformity of the forming of the concrete aerated block are further ensured.
Further, the ratio of the perfluoropolyether to the tea saponin is 5: 1.
by adopting the technical scheme, the ratio of the perfluoropolyether to the tea saponin is 5: 1, the tea saponin can have the best matching effect with the perfluoropolyether while fully playing the foam stabilizing effect.
The invention also aims to provide a preparation method of the concrete aerated block, which comprises the following steps:
s1, preliminary mixing: mixing sand and water to obtain slurry, adding cement, lime, gypsum, tea saponin, propylene fiber, polycarboxylic acid water reducing agent, perfluoropolyether and sodium methyl siliconate, uniformly mixing, and stirring for 3-4 min;
s2, complete mixing: adding aluminum powder and ferrosilicon powder, mixing well, stirring for 1-2 min;
s3, foaming and molding: pouring into a mold, foaming and molding at 75-80 deg.C, and cutting;
s4, steam pressure curing: autoclaved curing is carried out for 5-6h under the pressure of 1-1.2MPa, and the temperature is 180-.
In conclusion, the invention has the following beneficial effects:
1. the polycarboxylate water reducing agent can be adsorbed on the surface of cement particles to destroy the flocculation structure of the cement particles, so that the cement paste can keep good dispersion effect, and further improve the fluidity and the flow retentivity of the cement paste.
2. The polypropylene fiber can be used as an anti-cracking fiber or a secondary reinforcing rib in concrete to overcome the defect of high brittleness of the concrete, and the polypropylene fiber can reduce the plastic shrinkage, drying shrinkage, permeability and early cracks of the concrete, but can also cause the reduction of the fluidity and the flow retentivity of the concrete.
3. The polycarboxylate superplasticizer has an interface adsorption behavior on the surface of polypropylene fibers, and can effectively eliminate adverse effects on the fluidity and the flow retentivity of concrete. In addition, the polycarboxylic acid water reducing agent and the polypropylene fiber can obviously improve the pore structure of the concrete aerated block and reduce the cracking property of the concrete aerated block when being used together.
4. The sodium methyl silanol is doped into the slurry, and along with the hydration and hardening of the gel material, as a large amount of alkaline substances exist in the slurry, the sodium methyl silanol is excited to be polycondensed into the polycondensed silanol, and the polycondensed silanol reacts with hydroxyl groups in the aerated concrete in a physical adsorption mode and a chemical adsorption mode to form polysiloxane, so that a net-shaped hydrophobic film is formed in holes, and as the polysiloxane exists on the walls of the aerated concrete holes, the contact angle between water and the walls of the holes is larger than 90 degrees, so that the water absorption rate of the aerated concrete is reduced.
5. The perfluoropolyether has good lubricating effect, can effectively improve the fluidity of a system, has good volatility, and can continuously volatilize in the foaming forming process, so that the concrete aerated block is more compact in a part without a hole structure and has stronger hardness and crack resistance. In addition, the perfluoropolyether, the sodium methylsilanolate and the formed polysilicol have good compatibility, so that more perfluoropolyether is gathered on a reticular hydrophobic film formed in a hole, and capillaries on the wall of the hole are effectively reduced in the foaming forming process, so that the anti-cracking performance is further improved.
6. The tea saponin is a nonionic surfactant, can obviously reduce the surface tension of an interface, has good foam stabilizing effect in the system gas forming process, and effectively prevents the combination and overflow of bubbles; but also can improve the pore structure and increase the uniformity of pores, thereby being beneficial to improving the compressive strength of aerated concrete products. The tea saponin can also improve the compatibility of the perfluoropolyether and a system, improve the dispersibility of the perfluoropolyether in the system, and ensure that the concrete aerated block is uniform and compact after being molded. Meanwhile, after the tea saponin improves the dispersion uniformity of the perfluoropolyether, the volatilization speed of the perfluoropolyether can be improved, and the compactness and uniformity of the forming of the concrete aerated block are further ensured.
Drawings
FIG. 1 is a flow chart of a method provided by the present invention.
Detailed Description
The present invention will be described in further detail with reference to the following drawings and examples.
Examples
Example 1
The concrete aerated block comprises the raw material components in parts by weight shown in Table 1.
The slurry is a mixture of sand and water, and the proportion of the sand in the slurry is 60%.
As shown in fig. 1, the preparation method comprises the following steps:
s1, preliminary mixing: mixing sand and water to obtain slurry, adding cement, lime, gypsum, tea saponin, propylene fiber, polycarboxylic acid water reducing agent, perfluoropolyether and sodium methyl siliconate, uniformly mixing, and stirring for 3 min;
s2, complete mixing: adding aluminum powder and ferrosilicon powder, mixing well, stirring for 2 min;
s3, foaming and molding: pouring into a mold, foaming and molding at 75 ℃, and cutting;
s4, steam pressure curing: autoclaved curing is carried out for 5 hours under the pressure of 1MPa, and the temperature is 180 ℃.
Example 2
The concrete aerated block comprises the raw material components in parts by weight shown in Table 1.
The slurry is a mixture of sand and water, and the proportion of the sand in the slurry is 60%.
The preparation method comprises the following steps:
s1, preliminary mixing: mixing sand and water to obtain slurry, adding cement, lime, gypsum, tea saponin, propylene fiber, polycarboxylic acid water reducing agent, perfluoropolyether and sodium methyl siliconate, uniformly mixing, and stirring for 3 min;
s2, complete mixing: adding aluminum powder and ferrosilicon powder, mixing well, stirring for 2 min;
s3, foaming and molding: pouring into a mold, foaming and molding at 80 ℃, and cutting;
s4, steam pressure curing: autoclaved curing is carried out for 5 hours under the pressure of 1.1MPa, and the temperature is 190 ℃.
Example 3
The concrete aerated block comprises the raw material components in parts by weight shown in Table 1.
The slurry is a mixture of sand and water, and the proportion of the sand in the slurry is 60%.
The preparation method comprises the following steps:
s1, preliminary mixing: mixing sand and water to obtain slurry, adding cement, lime, gypsum, tea saponin, propylene fiber, polycarboxylic acid water reducing agent, perfluoropolyether and sodium methyl siliconate, uniformly mixing, and stirring for 4 min;
s2, complete mixing: adding aluminum powder and ferrosilicon powder, mixing well, stirring for 1 min;
s3, foaming and molding: pouring into a mold, foaming and molding at 80 ℃, and cutting;
s4, steam pressure curing: autoclaved curing is carried out for 6 hours under the pressure of 1.2MPa, and the temperature is 200 ℃.
Example 4
The difference from example 2 is that the raw material components are shown in table 1 in parts by weight.
Example 5
The difference from example 2 is that the raw material components are shown in table 1 in parts by weight.
Example 6
The difference from example 2 is that the raw material components are shown in table 1 in parts by weight.
Example 7
The difference from example 2 is that the raw material components are shown in table 1 in parts by weight.
Example 8
The difference from example 2 is that the raw material components are shown in table 1 in parts by weight.
Wherein, the tea saponin is replaced by sodium dodecyl sulfate.
Performance test
B05-grade aerated concrete sample with the volume density of 500kg/m is prepared3Left and right.
And (3) detecting the compressive strength: according to the regulation in GB/T11971-1997 aeroconcrete mechanical property test method, the test samples are subjected to compressive strength detection, and the detection results are shown in Table 2;
and (3) detecting a dry-wet cycle coefficient: the samples were subjected to dry-wet cycle dilution testing in accordance with the regulations in GB/T11970-1997 test methods for aerated concrete bulk density, water content and water absorption, and the test results are shown in Table 2.
And (3) freeze-thaw cycle coefficient detection: putting the sample into a blast drying oven to be dried to constant weight, cooling and weighing the sample, and then putting the sample into a constant-temperature water tank to be soaked for 48 hours; the sample was taken out and wiped to dry the surface moisture, and then put into a low temperature cabinet cooled to-15 ℃ in advance, frozen at-20 + -2 ℃ for 6 hours, and put into a constant temperature water tank with a water temperature of (20 + -5) ℃ to melt for 5 hours, and as a freeze-thaw cycle, the freeze-thaw cycle was continued for 15 times, and the mass loss rate of the sample before and after the test was calculated and obtained, and the results are shown in table 2.
Watch 1 (recipe watch)
TABLE 2 (Performance parameters)
From the experimental results, the addition of sodium methylsilanolate can generate a remarkable enhancing effect on the compressive strength and the crack resistance of the system. And the proportion of the perfluoropolyether to the tea saponin is 5: 1, the same obviously enhances the compressive strength and the crack resistance of the system.
The present embodiment is only for explaining the present invention, and it is not limited to the present invention, and those skilled in the art can make modifications of the present embodiment without inventive contribution as needed after reading the present specification, but all of them are protected by patent law within the scope of the claims of the present invention.
Claims (7)
1. A concrete air-entraining block is characterized in that: the raw materials comprise the following components in parts by weight,
slurry 2080-2100 parts;
230 portions and 260 portions of cement;
200 portions and 220 portions of lime;
1.0-1.5 parts of aluminum powder;
4-6 parts of ferrosilicon powder;
2-3 parts of propylene fiber;
10-15 parts of a polycarboxylic acid water reducing agent.
2. The concrete aerated block of claim 1, wherein: the raw materials comprise 50-55 parts of gypsum by weight.
3. The concrete aerated block of claim 1, wherein: the raw material comprises 0.2-0.4 part of sodium methyl silanol by weight.
4. A concrete aerated block according to claim 3 wherein: the raw material comprises 2.5-3 parts of perfluoropolyether by weight, and the polymerization degree of the perfluoropolyether is less than 100.
5. The concrete aerated block of claim 4, wherein: the raw material comprises 0.5-0.6 part of tea saponin according to the parts by weight.
6. The concrete aerated block of claim 5, wherein: the ratio of the perfluoropolyether to the tea saponin is 5: 1.
7. the method for preparing a concrete aerated block according to any one of claims 1 to 6, wherein: comprises the following steps of (a) carrying out,
s1, preliminary mixing: mixing sand and water to obtain slurry, adding cement, lime, gypsum, tea saponin, propylene fiber, polycarboxylic acid water reducing agent, perfluoropolyether and sodium methyl siliconate, uniformly mixing, and stirring for 3-4 min;
s2, complete mixing: adding aluminum powder and ferrosilicon powder, mixing well, stirring for 1-2 min;
s3, foaming and molding: pouring into a mold, foaming and molding at 75-80 deg.C, and cutting;
s4, steam pressure curing: autoclaved curing is carried out for 5-6h under the pressure of 1-1.2MPa, and the temperature is 180-.
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113387640A (en) * | 2021-06-02 | 2021-09-14 | 南昌航空大学 | Integral super-hydrophobic portland cement foam concrete product and preparation method thereof |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108947431A (en) * | 2018-09-10 | 2018-12-07 | 山东和悦生态新材料科技有限责任公司 | A kind of steam pressure porcelain powder air entrained concrete heat insulation building block |
| CN109553380A (en) * | 2019-01-16 | 2019-04-02 | 温州嘉豪建设有限公司 | A kind of bridge construction concrete formulation and preparation method thereof |
| CN109809783A (en) * | 2019-03-23 | 2019-05-28 | 中山市建宏新型建材有限公司 | A kind of autoclave aerated concrete building block |
-
2019
- 2019-10-25 CN CN201911026273.2A patent/CN110950586A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108947431A (en) * | 2018-09-10 | 2018-12-07 | 山东和悦生态新材料科技有限责任公司 | A kind of steam pressure porcelain powder air entrained concrete heat insulation building block |
| CN109553380A (en) * | 2019-01-16 | 2019-04-02 | 温州嘉豪建设有限公司 | A kind of bridge construction concrete formulation and preparation method thereof |
| CN109809783A (en) * | 2019-03-23 | 2019-05-28 | 中山市建宏新型建材有限公司 | A kind of autoclave aerated concrete building block |
Non-Patent Citations (2)
| Title |
|---|
| 夏寿荣 编著: "《最新混凝土外加剂生产配方精选400例》", 31 January 2014, 中国建材工业出版社 * |
| 袁锐文主编: "《地下防水施工便携手册》", 31 January 2006, 中国计划出版社 * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113387640A (en) * | 2021-06-02 | 2021-09-14 | 南昌航空大学 | Integral super-hydrophobic portland cement foam concrete product and preparation method thereof |
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