CN116283121A - High-fluidity foam concrete and preparation method thereof - Google Patents
High-fluidity foam concrete and preparation method thereof Download PDFInfo
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- CN116283121A CN116283121A CN202211711732.2A CN202211711732A CN116283121A CN 116283121 A CN116283121 A CN 116283121A CN 202211711732 A CN202211711732 A CN 202211711732A CN 116283121 A CN116283121 A CN 116283121A
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- 239000011381 foam concrete Substances 0.000 title claims abstract description 41
- 238000002360 preparation method Methods 0.000 title abstract description 10
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 58
- 239000000178 monomer Substances 0.000 claims abstract description 31
- 238000003756 stirring Methods 0.000 claims abstract description 27
- 239000004088 foaming agent Substances 0.000 claims abstract description 26
- 239000003638 chemical reducing agent Substances 0.000 claims abstract description 24
- 239000006260 foam Substances 0.000 claims abstract description 24
- 239000000843 powder Substances 0.000 claims abstract description 19
- 239000004568 cement Substances 0.000 claims abstract description 18
- 239000002002 slurry Substances 0.000 claims abstract description 16
- 239000002131 composite material Substances 0.000 claims abstract description 12
- 239000010881 fly ash Substances 0.000 claims abstract description 12
- 239000002893 slag Substances 0.000 claims abstract description 12
- 239000000203 mixture Substances 0.000 claims abstract description 11
- 229910021487 silica fume Inorganic materials 0.000 claims abstract description 10
- 238000005187 foaming Methods 0.000 claims abstract description 9
- 239000003381 stabilizer Substances 0.000 claims abstract description 7
- 239000000463 material Substances 0.000 claims abstract description 5
- 235000019738 Limestone Nutrition 0.000 claims abstract description 4
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 claims abstract description 4
- 239000006028 limestone Substances 0.000 claims abstract description 4
- 239000011574 phosphorus Substances 0.000 claims abstract description 4
- 229910052698 phosphorus Inorganic materials 0.000 claims abstract description 4
- ROOXNKNUYICQNP-UHFFFAOYSA-N ammonium persulfate Chemical group [NH4+].[NH4+].[O-]S(=O)(=O)OOS([O-])(=O)=O ROOXNKNUYICQNP-UHFFFAOYSA-N 0.000 claims description 12
- 239000000243 solution Substances 0.000 claims description 12
- CIWBSHSKHKDKBQ-JLAZNSOCSA-N Ascorbic acid Chemical compound OC[C@H](O)[C@H]1OC(=O)C(O)=C1O CIWBSHSKHKDKBQ-JLAZNSOCSA-N 0.000 claims description 8
- 238000002156 mixing Methods 0.000 claims description 7
- NIXOWILDQLNWCW-UHFFFAOYSA-N 2-Propenoic acid Natural products OC(=O)C=C NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 claims description 6
- 229910001870 ammonium persulfate Inorganic materials 0.000 claims description 6
- 239000003999 initiator Substances 0.000 claims description 6
- 238000004321 preservation Methods 0.000 claims description 6
- SMZOUWXMTYCWNB-UHFFFAOYSA-N 2-(2-methoxy-5-methylphenyl)ethanamine Chemical compound COC1=CC=C(C)C=C1CCN SMZOUWXMTYCWNB-UHFFFAOYSA-N 0.000 claims description 4
- ZZZCUOFIHGPKAK-UHFFFAOYSA-N D-erythro-ascorbic acid Natural products OCC1OC(=O)C(O)=C1O ZZZCUOFIHGPKAK-UHFFFAOYSA-N 0.000 claims description 4
- 229930003268 Vitamin C Natural products 0.000 claims description 4
- XBDQKXXYIPTUBI-UHFFFAOYSA-N dimethylselenoniopropionate Natural products CCC(O)=O XBDQKXXYIPTUBI-UHFFFAOYSA-N 0.000 claims description 4
- 230000002209 hydrophobic effect Effects 0.000 claims description 4
- 238000000034 method Methods 0.000 claims description 4
- 230000037452 priming Effects 0.000 claims description 4
- 235000019154 vitamin C Nutrition 0.000 claims description 4
- 239000011718 vitamin C Substances 0.000 claims description 4
- 108010064851 Plant Proteins Proteins 0.000 claims description 3
- 239000011398 Portland cement Substances 0.000 claims description 3
- 229910004298 SiO 2 Inorganic materials 0.000 claims description 3
- 235000021120 animal protein Nutrition 0.000 claims description 3
- 239000001913 cellulose Substances 0.000 claims description 3
- 229920002678 cellulose Polymers 0.000 claims description 3
- 238000013329 compounding Methods 0.000 claims description 3
- 238000007865 diluting Methods 0.000 claims description 3
- SYELZBGXAIXKHU-UHFFFAOYSA-N dodecyldimethylamine N-oxide Chemical compound CCCCCCCCCCCC[N+](C)(C)[O-] SYELZBGXAIXKHU-UHFFFAOYSA-N 0.000 claims description 3
- 238000007580 dry-mixing Methods 0.000 claims description 3
- 235000021118 plant-derived protein Nutrition 0.000 claims description 3
- 229920002401 polyacrylamide Polymers 0.000 claims description 3
- 239000002861 polymer material Substances 0.000 claims description 3
- 239000002202 Polyethylene glycol Substances 0.000 claims description 2
- 239000007864 aqueous solution Substances 0.000 claims description 2
- 238000006243 chemical reaction Methods 0.000 claims description 2
- -1 isopentenyl Chemical group 0.000 claims description 2
- 230000007935 neutral effect Effects 0.000 claims description 2
- 229920001223 polyethylene glycol Polymers 0.000 claims description 2
- 229940051841 polyoxyethylene ether Drugs 0.000 claims description 2
- 229920000056 polyoxyethylene ether Polymers 0.000 claims description 2
- 235000019260 propionic acid Nutrition 0.000 claims description 2
- IUVKMZGDUIUOCP-BTNSXGMBSA-N quinbolone Chemical compound O([C@H]1CC[C@H]2[C@H]3[C@@H]([C@]4(C=CC(=O)C=C4CC3)C)CC[C@@]21C)C1=CCCC1 IUVKMZGDUIUOCP-BTNSXGMBSA-N 0.000 claims description 2
- 239000007787 solid Substances 0.000 claims description 2
- 230000000694 effects Effects 0.000 abstract description 7
- 238000011049 filling Methods 0.000 abstract description 2
- 238000009775 high-speed stirring Methods 0.000 abstract 1
- 230000000052 comparative effect Effects 0.000 description 9
- 238000012360 testing method Methods 0.000 description 6
- 238000005189 flocculation Methods 0.000 description 4
- 230000016615 flocculation Effects 0.000 description 4
- 101100327917 Caenorhabditis elegans chup-1 gene Proteins 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 150000001875 compounds Chemical class 0.000 description 2
- 238000010276 construction Methods 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 238000010998 test method Methods 0.000 description 2
- 229920002430 Fibre-reinforced plastic Polymers 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 230000000740 bleeding effect Effects 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 239000000084 colloidal system Substances 0.000 description 1
- 238000005056 compaction Methods 0.000 description 1
- 239000004567 concrete Substances 0.000 description 1
- 239000000470 constituent Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 230000003311 flocculating effect Effects 0.000 description 1
- 238000000227 grinding Methods 0.000 description 1
- 239000012510 hollow fiber Substances 0.000 description 1
- 230000000977 initiatory effect Effects 0.000 description 1
- 229910052500 inorganic mineral Inorganic materials 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 239000011325 microbead Substances 0.000 description 1
- 239000011707 mineral Substances 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 238000011056 performance test Methods 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 229920003023 plastic Polymers 0.000 description 1
- 238000005381 potential energy Methods 0.000 description 1
- 238000005086 pumping Methods 0.000 description 1
- 238000010526 radical polymerization reaction Methods 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 238000010079 rubber tapping Methods 0.000 description 1
- 238000007790 scraping Methods 0.000 description 1
- 230000000087 stabilizing effect Effects 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
- 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
- C04B28/04—Portland cements
-
- 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
- C04B38/00—Porous mortars, concrete, artificial stone or ceramic ware; Preparation thereof
- C04B38/10—Porous mortars, concrete, artificial stone or ceramic ware; Preparation thereof by using foaming agents or by using mechanical means, e.g. adding preformed foam
- C04B38/106—Porous mortars, concrete, artificial stone or ceramic ware; Preparation thereof by using foaming agents or by using mechanical means, e.g. adding preformed foam by adding preformed foams
-
- 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
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/40—Porous or lightweight materials
-
- 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
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/91—Use of waste materials as fillers for mortars or concrete
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Inorganic Chemistry (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
The application belongs to the field of foam concrete, and particularly discloses high-fluidity foam concrete and a preparation method thereof. The high fluidity foam concrete comprises cement, fly ash, slag, ground powder, silica fume, a water reducing agent, a foam stabilizer, a foaming agent and water; the water reducer is a composite water reducer of phosphorus-containing monomers, and has the effects of reducing viscosity and improving strength; the ground fine powder is limestone powder, and can be used for filling cement gaps together with other powdery admixtures, so that the fluidity is improved; the preparation method comprises the following steps: stirring powdery materials such as cement, fly ash and the like to obtain a dry mixture, adding a water reducing agent and water, continuously stirring to obtain a primary mixture, adding foam accounting for 20-30% of the total volume fraction formed by a foaming machine into the primary mixture, stirring at a low speed for a period of time, adding the rest foam into a high-speed stirring, and finally injecting into a mould to obtain the foam concrete with high fluidity. The foam concrete prepared by the invention has the advantages of full slurry, high fluidity and high strength.
Description
Technical Field
The invention belongs to the technical field of foam concrete, and particularly relates to foam concrete with high fluidity and a preparation method thereof.
Background
The foam concrete is light porous concrete which is formed by fully foaming a foaming agent in a mechanical way through a foaming machine, uniformly mixing the foam and cement slurry, and then carrying out cast-in-place construction or mould forming through a pumping system and carrying out reasonable maintenance. The self-leveling self-compacting hollow fiber reinforced plastic composite material has the advantages of small apparent density, self-leveling property, self-compaction, convenient construction, heat preservation and the like, and is widely applied to a plurality of fields of building heat preservation, load-shedding backfill, cavity filling and the like. But the problems of low strength, poor fluidity, large water absorption, poor pumpability and the like appear in practical engineering application.
Therefore, development of foam concrete with higher fluidity is needed, which plays a positive role in the development and function increase of the foam concrete. The high flow properties of the slurry are conditions under which the foam concrete achieves self-leveling, but increasing the fluidity largely necessitates ensuring a sufficient amount of water, which results in a failure to achieve very high strength, and a high water-cement ratio may lead to a reduction in the stability of the slurry, so that improving the fluidity of the slurry should be initiated from the optimization of the composition of the material.
Disclosure of Invention
In order to overcome the defects in the prior art, the invention aims to provide high-fluidity foam concrete with certain strength capable of realizing self-leveling and a preparation method thereof.
In order to achieve the above purpose, the present invention adopts the following technical scheme:
the high-fluidity foam concrete comprises the following components in parts by weight: 130-155 parts of cement, 20-40 parts of fly ash, 10-20 parts of slag, 20-40 parts of fine powder, 3-5 parts of silica fume, 0.3-0.6 part of composite water reducer, 0.04-0.08 part of foam stabilizer, 0.9-0.11 part of foaming agent and 80-100 parts of water. By adding powdery admixture such as fly ash, ground powder, slag and the like, the cement gap can be filled, the space which is originally filled with water in the flocculation structure is occupied, the water in the flocculation structure is released, the fluidity is improved, and the strength is not influenced.
Preferably, the compound water reducer is prepared by adopting a monomer A, a monomer B and a monomer C as main raw materials through free radical polymerization under the initiation of a normal-temperature redox system, and comprises the following components in parts by weight: 35-45 parts of monomer A, 5-10 parts of monomer B,10-20 parts of monomer C, 0.5-0.15 part of initiator and 50-65 parts of water; wherein, the monomer A is one of methyl allyl polyoxyethylene ether or isopentenyl polyethylene glycol; the monomer B is a phosphorus-containing monomer; monomer C is acrylic acid or acrylic acid salt; the initiator is ammonium persulfate, and the vitamin C is hydrophobic propionic acid according to the mass ratio of 2:1: 1.
The composite water reducing agent is prepared according to the following method:
s1, dissolving ammonium persulfate in an initiator in 15 parts of water, and uniformly stirring to prepare an ammonium persulfate aqueous solution;
s2, dissolving one third of the mass of the monomer A, the monomer B and the monomer C in 25 parts of water, adding the water solution prepared in the step S1 in advance, and uniformly mixing to serve as priming solution for later use;
and S3, dissolving the rest two thirds of the mass of the monomer A, the monomer B, the monomer C, the vitamin C and the hydrophobic acrylic acid in 40 parts of water, uniformly mixing, slowly and uniformly adding the priming solution prepared in the step S2, after 2-3 hours of addition, carrying out heat preservation reaction for 3 hours after the addition, and adding water to dilute to 35% of solid content after the heat preservation is finished.
The composite water reducer formed by adopting the method can reduce the viscosity and ensure the strength. The water reducer is adsorbed on the surface of cement particles to generate electrostatic repulsive force, has the functions of deagglomeration and dispersion, and releases the free water wrapped in the flocculating constituent, thereby remarkably increasing the fluidity of the slurry.
Preferably, the ground powder in the high fluidity foam concrete is limestone powder, and the specific surface area is 1200-1600m 2 /kg。
Preferably, the foaming agent is a physical foaming agent, namely a foaming agent formed by compounding animal and plant proteins and a high polymer material, and has neutral pH value and good affinity with water.
Preferably, the cement in the high fluidity foam concrete is Portland cement P.O42.5, and the fineness is 6.2%.
Preferably, the foam stabilizer in the high-fluidity foam concrete is one selected from polyacrylamide, dodecyl dimethyl amine oxide and cellulose.
Preferably, the silica fume density in the foam concrete with high fluidity is 2.18g/cm 3 Specific surface area 19000m 2 /kg，SiO 2 The content was 87%.
The preparation method of the high-fluidity foam concrete comprises the following steps:
s1, pouring cement, fly ash, slag, ground powder and silica fume into a stirrer for dry mixing according to parts by weight, and pouring water and a water reducing agent into the stirrer for continuous stirring;
s2, diluting the foaming agent according to the weight parts of 1:25-1:45, uniformly stirring, adding the mixture into a foaming machine, introducing air into the foaming agent solution by the foaming machine, and changing the foaming agent solution into foam;
and S3, adding foam accounting for 30-40% of the total foam addition amount into the slurry under low-speed stirring according to the volume, stirring for a period of time to uniformly disperse the materials, adding the rest foam, stirring at a high speed, and finally injecting the mixture into a mold.
In the step S1, the stirring rotating speed is 60r/min, and the total stirring time is 4-6min;
in the step S3, the low-speed rotating speed is 40r/min, the high-speed rotating speed is 55r/min, and the total stirring time is 3-5min.
Through adopting above-mentioned technical scheme, S1 stirs in above-mentioned rotational speed and time range, can make the ground paste intensive mixing even, is favorable to improving the fluidity. S3, stirring is carried out within the rotating speed and time range, so that the foam and other components are fully mixed and uniformly dispersed in the whole system, the effect of moistening and mixing is achieved, and the fluidity is improved.
Compared with the prior art, the invention has the following beneficial effects:
1. the foam concrete has the advantages of full slurry, low viscosity of the mixture, high flow speed and good foam stabilizing effect.
2. The composite water reducer added with the phosphorus-containing monomer reduces the relative ultimate shear stress and the relative viscosity of the slurry, greatly improves the fluidity of the slurry, enables the slurry to realize self-leveling, reduces the water consumption and improves the strength of the slurry.
3. The powdery admixture has a microbead effect and a microaggregate effect, and can fully exert the respective effect of improving the flow property of slurry after being added, and generate a superposition effect; the powdery admixture is added, so that good inclusion and homogeneity of the foam concrete under the condition of high fluidity are improved, and the foam concrete is superior to the traditional proportion.
4. The composite foaming agent is adopted, so that more beneficial small bubbles are ensured to exist under the condition of larger water content, the surface potential energy is reduced, the stability of the bubbles is improved, and bleeding phenomenon is not easy to occur; meanwhile, the foam concrete has smooth effect among colloid particles, provides closed air holes, and has higher foam concrete strength.
Detailed Description
The high-fluidity foam concrete comprises the following components in parts by weight: 130-155 parts of cement, 20-40 parts of fly ash, 10-20 parts of slag, 20-40 parts of fine powder, 3-5 parts of silica fume, 0.3-0.6 part of composite water reducer, 0.04-0.08 part of foam stabilizer, 0.9-0.11 part of foaming agent and 80-100 parts of water. By adding powdery admixture such as fly ash, ground powder, slag and the like, the cement gap can be filled, the space which is originally filled with water in the flocculation structure is occupied, the water in the flocculation structure is released, the fluidity is improved, and the strength is not influenced.
The preparation method of the high-fluidity foam concrete comprises the following steps:
s1, pouring cement, fly ash, slag, ground powder and silica fume into a stirrer for dry mixing for 2-3 minutes, and pouring water and a compound water reducer into the stirrer for continuous stirring for 2-3 minutes at the rotating speed of 60r/min.
S2, diluting the foaming agent according to the weight parts of 1:25-1:45, uniformly stirring, adding the mixture into a foaming machine, introducing air into the foaming agent solution by the foaming machine, and changing the foaming agent solution into foam;
s3, adding foam accounting for 30-40% of the total foam addition amount into the slurry under low-speed stirring for 2-3 minutes at a rotating speed of 40r/min; after the materials are uniformly dispersed, adding the residual foam, stirring at a high speed for 1-2 minutes at a rotating speed of 55r/min, and finally injecting the mixture into a die.
Wherein, the water reducer is a composite water reducer; the fine powder is limestone powder; the foaming agent is a physical foaming agent, namely a foaming agent formed by compounding animal and plant proteins and a high polymer material; the cement is ordinary Portland cement P.O42.5 with fineness of 6.2%; the foam stabilizer is one of polyacrylamide, dodecyl dimethyl amine oxide and cellulose; the density of the silica fume is 2.18g/cm 3 ，SiO 2 The content was 87%.
Specific examples are shown in table 1:
TABLE 1
| Example 1 | Example 2 | Example 3 | Example 4 | |
| Cement and its preparation method | 6156 | 6930 | 6093 | 7056 |
| Fly ash | 900 | 600 | 300 | 1350 |
| Slag (slag) | 900 | 450 | 900 | 450 |
| Grinding fine powder | 900 | 750 | 600 | 900 |
| Water reducing agent | 18 | 13.5 | 27 | 18 |
| Foam stabilizer | 2.7 | 3.6 | 1.8 | 2.7 |
| Foaming agent | 4.59 | 4.68 | 4.86 | 4.77 |
| Water and its preparation method | 3600 | 3600 | 2700 | 2700 |
Examples 1-4 were tested as follows:
(1) Fluidity test
Test object: examples 1 to 4, comparative examples 1 to 4 were each mixed in the respective proportions to prepare foam concrete.
The test method comprises the following steps: marking a measuring cup 1 and a measuring cup 2 on the outer side of the measuring cup body by using a water color pen respectively, and cleaning wiping instruments and equipment; the hollow cylinder is vertically erected in the middle of the smooth hard plastic plate; taking a sample by using the measuring cup 1, and pouring the sample into the measuring cup 2; pouring the sample in the measuring cup 2 into the hollow cylinder slowly, and tapping the outer side of the hollow cylinder by using a flat-mouth knife to fill the whole hollow cylinder with the sample; slowly scraping the sample along the port plane of the hollow cylinder by using a flat-mouth knife; the hollow cylinder should be slowly lifted vertically upwards and the sample should be allowed to collapse naturally, the diameters in both directions measured with a ruler and the average taken as the fluidity.
(2) Compressive Strength test
Test object: examples 1 to 4, comparative examples 1 to 4 were each stirred in the respective proportions to prepare foam concrete slurries, which were then poured into a mold to prepare 100 mm. Times.100 mm cube standard test pieces.
The test method comprises the following steps: the test was carried out according to foam concrete (JG/T266-2011) to determine the compressive strength of 7d and 28 d.
The results of the high fluidity foam concrete performance test provided in the above examples and comparative examples 1 to 4 are shown in table 2:
the comparative example differs from the example only in that:
the water reducer is a common polycarboxylic acid high-efficiency water reducer.
TABLE 2
| Examples | Fluidity/mm | 7d compressive Strength/MPa | 28d compressive Strength/MPa |
| Example 1 | 192 | 6.78 | 9.74 |
| Example 2 | 203 | 7.23 | 9.48 |
| Example 3 | 179 | 8.13 | 10.67 |
| Example 4 | 183 | 7.84 | 9.12 |
| Comparative example 1 | 144 | 5.87 | 9.25 |
| Comparative example 2 | 165 | 6.92 | 8.75 |
| Comparative example 3 | 161 | 8.23 | 8.99 |
| Comparative example 4 | 153 | 6.45 | 8.25 |
As can be seen from the comparison of the data of the examples and the comparative examples in Table 2, the fluidity of the prepared sample is obviously improved and the strength is improved to a certain extent by adding the composite water reducing agent. As can be seen from the comparison of the data of examples 1-4, the difference in the amounts of mineral admixture will result in a change in fluidity and compressive strength when the fly ash: slag: the proportion of the ground powder is 1.3: and when the ratio of the sample to the water is 1:1.6, the fluidity of the sample is higher, the strength meets the requirement, and the engineering requirement can be met.
Claims (10)
1. The high-fluidity foam concrete is characterized by comprising the following components in parts by weight:
130-155 parts of cement, 20-40 parts of fly ash, 10-20 parts of slag, 20-40 parts of fine powder, 3-5 parts of silica fume, 0.3-0.6 part of water reducer, 0.04-0.08 part of foam stabilizer, 0.9-0.11 part of foaming agent and 80-100 parts of water.
2. The high-fluidity foam concrete according to claim 1, wherein the water reducer is a composite water reducer, and comprises the following components in parts by weight: 35-45 parts of monomer A, 5-10 parts of monomer B,10-20 parts of monomer C, 0.5-1.5 parts of initiator and 50-65 parts of water; wherein, the monomer A is one of methyl allyl polyoxyethylene ether or isopentenyl polyethylene glycol; the monomer B is a phosphorus-containing monomer; monomer C is acrylic acid or acrylic acid salt; the initiator is ammonium persulfate, vitamin C and hydrophobic propionic acid according to the mass ratio of 2:1: 1.
3. The high fluidity foam concrete according to claim 2, wherein the composite water reducing agent is prepared as follows:
s1, dissolving ammonium persulfate in an initiator in 15 parts of water, and uniformly stirring to prepare an ammonium persulfate aqueous solution;
s2, dissolving one third of the mass of the monomer A, the monomer B and the monomer C in 25 parts of water, adding the water solution prepared in the step S1 in advance, and uniformly mixing to serve as priming solution for later use;
and S3, dissolving the rest two thirds of the mass of the monomer A, the monomer B, the monomer C, the vitamin C and the hydrophobic acrylic acid in 40 parts of water, uniformly mixing, slowly and uniformly adding the priming solution prepared in the step S2, after 2-3 hours of addition, carrying out heat preservation reaction for 3 hours after the addition, and adding water to dilute to 35% of solid content after the heat preservation is finished.
4. The high fluidity foam concrete according to claim 1, wherein the ground powder is limestone powder having a specific surface area of 1200-1600m 2 /kg。
5. The high fluidity foam concrete according to claim 1, wherein the foaming agent is a physical foaming agent, namely a foaming agent formed by compounding animal and plant proteins and a high polymer material, has a neutral ph value and has good affinity with water.
6. The high fluidity foam concrete according to claim 1, wherein the cement is Portland cement P.O42.5, fineness 6.2%.
7. The high fluidity foam concrete according to claim 1, wherein the foaming agent is one selected from the group consisting of polyacrylamide, dodecyldimethylamine oxide, and cellulose.
8. The high fluidity foam concrete according to claim 1, wherein the silica fume density is 2.18g/cm 3 Specific surface area 19000m 2 /kg，SiO 2 The content was 87%.
9. The method for preparing high fluidity foam concrete according to any one of claims 1 to 8, characterized by comprising the steps of:
s1, pouring cement, fly ash, slag, ground powder and silica fume into a stirrer for dry mixing according to parts by weight, and pouring water and a water reducing agent into the stirrer for continuous stirring;
s2, diluting the foaming agent according to the weight parts of 1:25-1:45, uniformly stirring, adding the mixture into a foaming machine, introducing air into the foaming agent solution by the foaming machine, and changing the foaming agent solution into foam;
and S3, adding foam accounting for 30-40% of the total foam addition amount into the slurry under low-speed stirring according to the volume, stirring for a period of time to uniformly disperse the materials, adding the rest foam, stirring at a high speed, and finally injecting the mixture into a mold.
10. The method for preparing high fluidity foam concrete according to claim 9, wherein: in the step S1, the stirring rotating speed is 60r/min, and the total stirring time is 4-6 minutes; in the step S3, the low-speed rotating speed is 40r/min, the high-speed rotating speed is 55r/min, and the total stirring time is 3-5 minutes.
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| CN117430385A (en) * | 2023-10-20 | 2024-01-23 | 山东省大通建设集团有限公司 | Foam concrete and preparation method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104108912A (en) * | 2014-06-19 | 2014-10-22 | 广东省建筑科学研究院 | Lightweight high-performance foam concrete and preparation method thereof |
| CN109627397A (en) * | 2018-12-24 | 2019-04-16 | 科之杰新材料集团有限公司 | A kind of polycarboxylate water-reducer and preparation method thereof improving cement slurry rheological behavior |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104108912A (en) * | 2014-06-19 | 2014-10-22 | 广东省建筑科学研究院 | Lightweight high-performance foam concrete and preparation method thereof |
| CN109627397A (en) * | 2018-12-24 | 2019-04-16 | 科之杰新材料集团有限公司 | A kind of polycarboxylate water-reducer and preparation method thereof improving cement slurry rheological behavior |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117430385A (en) * | 2023-10-20 | 2024-01-23 | 山东省大通建设集团有限公司 | Foam concrete and preparation method thereof |
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