CN115872700A - Concrete and hollow steel pipe concrete rectangular beam - Google Patents
Concrete and hollow steel pipe concrete rectangular beam Download PDFInfo
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- CN115872700A CN115872700A CN202211511691.2A CN202211511691A CN115872700A CN 115872700 A CN115872700 A CN 115872700A CN 202211511691 A CN202211511691 A CN 202211511691A CN 115872700 A CN115872700 A CN 115872700A
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- 239000004567 concrete Substances 0.000 title claims abstract description 59
- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 28
- 239000010959 steel Substances 0.000 title claims abstract description 28
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- 239000002994 raw material Substances 0.000 claims abstract description 8
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims description 45
- 239000000243 solution Substances 0.000 claims description 40
- 238000002156 mixing Methods 0.000 claims description 18
- 238000002360 preparation method Methods 0.000 claims description 16
- XEKOWRVHYACXOJ-UHFFFAOYSA-N Ethyl acetate Chemical compound CCOC(C)=O XEKOWRVHYACXOJ-UHFFFAOYSA-N 0.000 claims description 15
- 235000019353 potassium silicate Nutrition 0.000 claims description 15
- NTHWMYGWWRZVTN-UHFFFAOYSA-N sodium silicate Chemical compound [Na+].[Na+].[O-][Si]([O-])=O NTHWMYGWWRZVTN-UHFFFAOYSA-N 0.000 claims description 15
- 238000003756 stirring Methods 0.000 claims description 15
- 238000000034 method Methods 0.000 claims description 14
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- -1 graphene oxide-modified aluminosilicate Chemical class 0.000 claims description 13
- KWYUFKZDYYNOTN-UHFFFAOYSA-M Potassium hydroxide Chemical compound [OH-].[K+] KWYUFKZDYYNOTN-UHFFFAOYSA-M 0.000 claims description 12
- VLKZOEOYAKHREP-UHFFFAOYSA-N n-Hexane Chemical compound CCCCCC VLKZOEOYAKHREP-UHFFFAOYSA-N 0.000 claims description 12
- 229940072033 potash Drugs 0.000 claims description 12
- BWHMMNNQKKPAPP-UHFFFAOYSA-L potassium carbonate Substances [K+].[K+].[O-]C([O-])=O BWHMMNNQKKPAPP-UHFFFAOYSA-L 0.000 claims description 12
- 235000015320 potassium carbonate Nutrition 0.000 claims description 12
- 239000002904 solvent Substances 0.000 claims description 9
- 239000006185 dispersion Substances 0.000 claims description 8
- 239000007788 liquid Substances 0.000 claims description 8
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims description 7
- 229920002678 cellulose Polymers 0.000 claims description 7
- 239000001913 cellulose Substances 0.000 claims description 7
- 238000000465 moulding Methods 0.000 claims description 7
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 6
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 claims description 6
- 229910004298 SiO 2 Inorganic materials 0.000 claims description 6
- 238000000498 ball milling Methods 0.000 claims description 6
- IJOOHPMOJXWVHK-UHFFFAOYSA-N chlorotrimethylsilane Chemical compound C[Si](C)(C)Cl IJOOHPMOJXWVHK-UHFFFAOYSA-N 0.000 claims description 6
- 239000002245 particle Substances 0.000 claims description 6
- 239000002002 slurry Substances 0.000 claims description 6
- HPTYUNKZVDYXLP-UHFFFAOYSA-N aluminum;trihydroxy(trihydroxysilyloxy)silane;hydrate Chemical compound O.[Al].[Al].O[Si](O)(O)O[Si](O)(O)O HPTYUNKZVDYXLP-UHFFFAOYSA-N 0.000 claims description 5
- 238000001035 drying Methods 0.000 claims description 5
- 229910052621 halloysite Inorganic materials 0.000 claims description 5
- 238000001291 vacuum drying Methods 0.000 claims description 4
- VHUUQVKOLVNVRT-UHFFFAOYSA-N Ammonium hydroxide Chemical compound [NH4+].[OH-] VHUUQVKOLVNVRT-UHFFFAOYSA-N 0.000 claims description 3
- 229920001046 Nanocellulose Polymers 0.000 claims description 3
- 239000012190 activator Substances 0.000 claims description 3
- 230000032683 aging Effects 0.000 claims description 3
- 235000011114 ammonium hydroxide Nutrition 0.000 claims description 3
- 238000001704 evaporation Methods 0.000 claims description 3
- 230000002431 foraging effect Effects 0.000 claims description 3
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- 238000006460 hydrolysis reaction Methods 0.000 claims description 3
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- 229910052757 nitrogen Inorganic materials 0.000 claims description 3
- 238000004806 packaging method and process Methods 0.000 claims description 3
- 238000007789 sealing Methods 0.000 claims description 3
- 238000001179 sorption measurement Methods 0.000 claims description 3
- 239000005051 trimethylchlorosilane Substances 0.000 claims description 3
- JEGUKCSWCFPDGT-UHFFFAOYSA-N h2o hydrate Chemical compound O.O JEGUKCSWCFPDGT-UHFFFAOYSA-N 0.000 claims description 2
- 238000005470 impregnation Methods 0.000 claims description 2
- 230000001105 regulatory effect Effects 0.000 claims 1
- 239000004566 building material Substances 0.000 abstract description 3
- 239000004576 sand Substances 0.000 description 12
- 238000012360 testing method Methods 0.000 description 10
- 239000011150 reinforced concrete Substances 0.000 description 7
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- 230000008569 process Effects 0.000 description 3
- RLQWHDODQVOVKU-UHFFFAOYSA-N tetrapotassium;silicate Chemical compound [K+].[K+].[K+].[K+].[O-][Si]([O-])([O-])[O-] RLQWHDODQVOVKU-UHFFFAOYSA-N 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
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- 239000011398 Portland cement Substances 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 230000009471 action Effects 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
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000001354 calcination Methods 0.000 description 1
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- 239000008367 deionised water Substances 0.000 description 1
- 229910021641 deionized water Inorganic materials 0.000 description 1
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- 238000001878 scanning electron micrograph Methods 0.000 description 1
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Images
Classifications
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- 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
Abstract
The invention relates to the field of building materials, in particular to a concrete and hollow steel tube concrete rectangular beam which is prepared from the following raw materials in parts by weight: 100-130 parts of cement, 300-350 parts of aggregate, 20-30 parts of basalt fiber, 10-20 parts of calcined clay, 15-30 parts of fly ash, 10-20 parts of graphene oxide modified aluminosilicate mineral, 3-5 parts of excitant, 10-20 parts of aerogel expanded perlite, 5-10 parts of redispersible latex powder and 40-60 parts of water.
Description
Technical Field
The invention relates to the field of building materials, in particular to a concrete and hollow steel pipe concrete rectangular beam.
Background
The reinforced concrete beam is made of reinforced concrete material, and the reinforced concrete beam can be made into independent beam, integral beam-plate floor system with reinforced concrete slab, or integral single-layer or multi-layer frame with reinforced concrete column. The reinforced concrete beam has various forms, is the most basic bearing component in engineering structures such as house buildings, bridge buildings and the like, and has extremely wide application range.
However, with the change of times and the development of economy, the building itself develops to a large span and a large internal space and a higher height, and with the increase of the building height and the requirements on the large space and the large span of the building, the load borne by the vertical bearing component is increased, the size of the vertical component is increased, the self weight is increased, and thus, higher requirements on the bearing capacity and the seismic resistance of the building are provided. And the reinforced concrete upper structure can lead to the structure self dead weight too big under the condition of high-rise building and large-span, still can lead to bulky concrete placement complicacy, reduces construction speed. The steel structure has a light weight, but the steel is expensive and has poor corrosion resistance and fire resistance. Therefore, the concrete-filled steel tube can be adopted, and the hollow concrete-filled steel tube is used as a branch of the concrete-filled steel tube, and has the characteristics of light self weight, prefabrication, low cost and the like compared with the concrete-filled steel tube, so that the concrete-filled steel tube has the advantages of application in high-rise buildings.
Disclosure of Invention
The purpose of the invention is as follows: in order to solve the technical problems or development trends, the invention provides a concrete and hollow steel tube concrete rectangular beam.
The adopted technical scheme is as follows:
the concrete is prepared from the following raw materials in parts by weight:
100-130 parts of cement, 300-350 parts of aggregate, 20-30 parts of basalt fiber, 10-20 parts of calcined clay, 15-30 parts of fly ash, 10-20 parts of graphene oxide modified aluminosilicate mineral, 3-5 parts of excitant, 10-20 parts of aerogel expanded perlite, 5-10 parts of redispersible latex powder and 40-60 parts of water.
Further, the preparation method of the graphene oxide modified aluminosilicate mineral comprises the following steps:
adding aluminosilicate mineral into the graphene oxide dispersion liquid, packaging in a ball milling tank, carrying out ball milling for 18-24h, atomizing the obtained slurry, conveying the atomized slurry into a reactor maintained at a set temperature through nitrogen, quickly evaporating the solvent at a high temperature to form graphene oxide modified aluminosilicate mineral particles, and finally transferring the graphene oxide modified aluminosilicate mineral particles into a vacuum drying oven for complete drying treatment.
Further, the aluminosilicate mineral is halloysite.
Further, the graphene oxide dispersion liquid is prepared by a brodi method, a staudenmier method or a hummers method, wherein the solvent of the graphene oxide dispersion liquid is water and ethyl acetate, and the volume ratio of the water to the ethyl acetate is 15-20:1.
further, the temperature of the reactor is 600-800 ℃.
Further, the excitant comprises potassium water glass and sodium hydroxide, and the mass ratio of the potassium water glass to the sodium hydroxide is 1-3:3-5.
Further, the preparation method of the aerogel expanded perlite comprises the following steps:
mixing nano-cellulose/SiO 2 Adding hydrosol into a vacuum cylinder filled with expanded perlite, sealing the vacuum cylinder, starting a vacuum pump, controlling the impregnation adsorption pressure of the expanded perlite by adjusting the vacuum degree in the vacuum cylinder to obtain a hydrosol/expanded perlite compound, taking out the hydrosol/expanded perlite compound, sucking the hydrosol on the surface, aging at normal temperature for 24-48h, then placing in water for aging for 24-48h, then sequentially performing solvent replacement by using ethanol, n-hexane and trimethylchlorosilane/n-hexane mixed solution, and drying at 60-100 ℃ for 4-8 h.
Further, the nano-cellulose/SiO 2 The preparation method of the hydrosol comprises the following steps:
uniformly mixing water glass and water, adding a hydrochloric acid solution into the mixture under a stirring state to enable the pH of the solution to be 1-2, carrying out sealed stirring and hydrolysis for 1-2h, adding nano-cellulose, uniformly stirring, and adding ammonia water to adjust the pH of the solution to 8-9.
The invention also provides a preparation method of the concrete, which comprises the following steps:
mixing cement, aggregate, basalt fiber, calcined clay, fly ash, graphene oxide modified aluminosilicate mineral and aerogel expanded perlite to prepare mixed powder, adding an excitant into a first part of water to prepare a first solution, adding re-dispersed latex powder into the rest of water to prepare a second solution, uniformly mixing the mixed powder with the first solution, adding the second solution, uniformly stirring, injecting into a mold, removing the mold after molding, and maintaining under standard maintenance conditions to a specified age.
The invention also provides a hollow concrete-filled steel tube rectangular beam which comprises a rectangular outer steel tube and an inner sleeve which are coaxial, wherein the concrete is filled between the rectangular outer steel tube and the inner sleeve.
The invention has the beneficial effects that:
the invention provides concrete, wherein aluminosilicate mineral and fly ash are used as auxiliary gel materials, under the action of an alkaline activator, inorganic polymer which is formed through the processes of dissolution, hydrolysis, polycondensation, solidification and the like and has high strength, long-term stability and good durability can be tightly filled with cement hydration products and aggregate, so that the performance of the concrete is improved, the alumina silicate mineral modified by graphene oxide can promote the cement hydration process while being used as the auxiliary gel materials, inorganic polymer generated by the polymerization of cement hydration crystals and the aluminosilicate mineral are mutually wound and interwoven to form a three-dimensional reticular microstructure, so that the mechanical property of the concrete is obviously improved, the self weight of the concrete can be reduced by adding expanded perlite, but the traditional expanded perlite has a honeycomb structure and lower strength, and the nano cellulose/SiO mineral is adopted 2 The gel filled expanded perlite holes can support and reinforce the concrete, improve the mechanical strength of the concrete and improve the overall bearing performance of the concrete.
Drawings
Fig. 1 is an SEM image of a graphene oxide-modified aluminosilicate mineral in example 1 of the present invention;
FIG. 2 is a schematic structural diagram of a hollow concrete-filled steel tube rectangular beam, wherein the numbers in the diagram represent the hollow concrete-filled steel tube rectangular beam respectively;
1-rectangular outer steel pipe, 2-inner sleeve and 3-concrete.
Detailed Description
The examples, in which specific conditions are not specified, were conducted under conventional conditions or conditions recommended by the manufacturer. The reagents or instruments used are not indicated by the manufacturer, and are all conventional products available commercially. The technology not mentioned in the present invention is referred to the prior art.
Cement: PO42.5 composite portland cement as building material;
river sand: sand in Yangtze river production area II, fineness modulus is 2.5%, and apparent density is 2380kg/m 3 ；
Ceramsite: shale ceramsite with nominal grain size of 5-10mm, cylinder pressure strength of 8.5MPa, water absorption of 1h of 3.3 percent and bulk density of 900kg/m 3 Apparent density 1350kg/m 3 ；
Basalt fiber: purchased from new material of haiyang ltd, tai an city;
calcining clay: purchased from hebei jiangshi new materials science and technology ltd;
fly ash: purchased from hebei jian stone new materials science and technology ltd;
graphene oxide-modified aluminosilicate mineral: self-making;
potassium water glass: purchased from Shanghai verticality industry Co., ltd;
sodium hydroxide: purchased from qingxing chemical products ltd, north of Hei;
aerogel expanded perlite: self-made;
redispersible latex powder: VAE redispersible latex powder available from Shandong Xin Tanno chemical Co., ltd;
example 1:
the concrete is prepared from the following raw materials in parts by weight:
120 parts of cement, 120 parts of river sand, 200 parts of ceramsite, 25 parts of basalt fiber, 15 parts of calcined clay, 20 parts of fly ash, 18 parts of graphene oxide modified aluminosilicate mineral, 1 part of potash water glass, 4 parts of sodium hydroxide, 15 parts of aerogel expanded perlite, 10 parts of redispersible latex powder and 50 parts of water.
The preparation method of the graphene oxide modified aluminosilicate mineral comprises the following steps:
adding 20g of graphene oxide prepared by a hummers method into a solvent consisting of 200mL of deionized water and 10mL of ethyl acetate, performing ultrasonic oscillation to prepare a dispersion liquid, adding 45g of halloysite powder into the dispersion liquid, packaging in a ball milling tank, performing ball milling for 24h, atomizing the obtained slurry, conveying the atomized slurry into a reactor maintained at a set temperature of 780 ℃ through nitrogen, quickly evaporating the solvent at a high temperature to form graphene oxide modified aluminosilicate mineral particles, and finally transferring the obtained particles into a vacuum drying oven to perform vacuum drying treatment for 24h at 50 ℃.
The preparation method of the aerogel expanded perlite comprises the following steps:
uniformly mixing 200g of water glass and 800mL of water, dropwise adding 1mol/L hydrochloric acid solution under stirring to make the pH of the solution be 1, hermetically stirring and hydrolyzing for 2 hours, then adding 20g of nano-cellulose, uniformly stirring, then adding ammonia water to adjust the pH of the solution to 9 to obtain nano-cellulose/SiO 2 Hydrosol, mixing nano cellulose/SiO 2 Adding hydrosol into a vacuum cylinder containing 50g of expanded perlite, sealing the vacuum cylinder, starting a vacuum pump, adjusting the dipping adsorption pressure in the vacuum cylinder to-0.08MPa for 2h to obtain a hydrosol/expanded perlite compound, taking out the hydrosol/expanded perlite compound, sucking the hydrosol on the surface, aging at normal temperature for 24h, placing in water for aging for 24h, sequentially performing solvent replacement by using ethanol, n-hexane and a trimethylchlorosilane/n-hexane mixed solution (mass ratio of 1.
The preparation method of the concrete comprises the following steps:
mixing cement, river sand, ceramsite, basalt fiber, calcined clay, fly ash, graphene oxide modified aluminosilicate mineral and aerogel expanded perlite to prepare mixed powder, adding potash water glass and sodium hydroxide into a first part of water to prepare a first solution, adding re-dispersed latex powder into the rest of water to prepare a second solution, uniformly mixing the mixed powder and the first solution, adding the second solution, uniformly stirring, injecting into a mold, removing the mold after molding, and maintaining under standard maintenance conditions to a specified age.
A rectangular hollow steel tube concrete beam comprises an outer rectangular steel tube (1) and an inner sleeve (2) which are coaxial, and the concrete (3) is filled between the outer rectangular steel tube (1) and the inner sleeve (2).
Example 2:
the concrete is prepared from the following raw materials in parts by weight:
130 parts of cement, 120 parts of river sand, 200 parts of ceramsite, 25 parts of basalt fiber, 20 parts of calcined clay, 30 parts of fly ash, 20 parts of graphene oxide modified aluminosilicate mineral, 1 part of potash water glass, 4 parts of sodium hydroxide, 20 parts of aerogel expanded perlite, 10 parts of redispersible latex powder and 60 parts of water.
The preparation method of the graphene oxide modified aluminosilicate mineral and the aerogel expanded perlite is the same as that in example 1.
The preparation method of the concrete comprises the following steps:
mixing cement, river sand, ceramsite, basalt fiber, calcined clay, fly ash, graphene oxide modified aluminosilicate mineral and aerogel expanded perlite to prepare mixed powder, adding potash water glass and sodium hydroxide into a first part of water to prepare a first solution, adding re-dispersed latex powder into the rest of water to prepare a second solution, uniformly mixing the mixed powder and the first solution, adding the second solution, uniformly stirring, injecting into a mold, removing the mold after molding, and maintaining under standard maintenance conditions to a specified age.
Example 3:
the concrete is prepared from the following raw materials in parts by weight:
100 parts of cement, 120 parts of river sand, 200 parts of ceramsite, 25 parts of basalt fiber, 10 parts of calcined clay, 15 parts of fly ash, 10 parts of graphene oxide modified aluminosilicate mineral, 1 part of potash water glass, 4 parts of sodium hydroxide, 10 parts of aerogel expanded perlite, 5 parts of redispersible latex powder and 40 parts of water.
The preparation method of the graphene oxide modified aluminosilicate mineral and the aerogel expanded perlite is the same as that in example 1.
The preparation method of the concrete comprises the following steps:
mixing cement, river sand, ceramsite, basalt fiber, calcined clay, fly ash, graphene oxide modified aluminosilicate mineral and aerogel expanded perlite to prepare mixed powder, adding potash water glass and sodium hydroxide into a first part of water to prepare a first solution, adding re-dispersed latex powder into the rest of water to prepare a second solution, uniformly mixing the mixed powder and the first solution, adding the second solution, uniformly stirring, injecting into a mold, removing the mold after molding, and maintaining under standard maintenance conditions to a specified age.
Example 4:
the concrete is prepared from the following raw materials in parts by weight:
130 parts of cement, 120 parts of river sand, 200 parts of ceramsite, 25 parts of basalt fiber, 10 parts of calcined clay, 30 parts of fly ash, 10 parts of graphene oxide modified aluminosilicate mineral, 1 part of potash water glass, 4 parts of sodium hydroxide, 20 parts of aerogel expanded perlite, 5 parts of redispersible latex powder and 60 parts of water.
The preparation method of the graphene oxide modified aluminosilicate mineral and the aerogel expanded perlite is the same as that in example 1.
The preparation method of the concrete comprises the following steps:
mixing cement, river sand, ceramsite, basalt fiber, calcined clay, fly ash, graphene oxide modified aluminosilicate mineral and aerogel expanded perlite to prepare mixed powder, adding potash water glass and sodium hydroxide into a first part of water to prepare a first solution, adding redispersed latex powder into the remaining water to prepare a second solution, uniformly mixing the mixed powder with the first solution, adding the second solution, uniformly stirring, injecting into a mold, removing the mold after molding, and curing under standard curing conditions to a specified age.
Example 5:
the concrete is prepared from the following raw materials in parts by weight:
100 parts of cement, 120 parts of river sand, 200 parts of ceramsite, 25 parts of basalt fiber, 20 parts of calcined clay, 15 parts of fly ash, 20 parts of graphene oxide modified aluminosilicate mineral, 1 part of potash water glass, 4 parts of sodium hydroxide, 10 parts of aerogel expanded perlite, 10 parts of redispersible latex powder and 40 parts of water.
The preparation method of the graphene oxide modified aluminosilicate mineral and the aerogel expanded perlite is the same as that in example 1.
The preparation method of the concrete comprises the following steps:
mixing cement, river sand, ceramsite, basalt fiber, calcined clay, fly ash, graphene oxide modified aluminosilicate mineral and aerogel expanded perlite to prepare mixed powder, adding potash water glass and sodium hydroxide into a first part of water to prepare a first solution, adding re-dispersed latex powder into the rest of water to prepare a second solution, uniformly mixing the mixed powder and the first solution, adding the second solution, uniformly stirring, injecting into a mold, removing the mold after molding, and maintaining under standard maintenance conditions to a specified age.
Comparative example 1:
substantially the same as in example 1 except that the graphene oxide-modified aluminosilicate mineral was not added.
Comparative example 2:
substantially the same as in example 1, except that a commercially available graphene oxide (beijing meiston scientific development limited) was used in place of the graphene oxide-modified aluminosilicate mineral.
Comparative example 3:
substantially the same as in example 1 except that a halloysite powder was used in place of the graphene oxide-modified aluminosilicate mineral.
Comparative example 4:
substantially the same as in example 1, except that a commercially available graphene oxide (beijing meston scientific development ltd) and halloysite powder were used instead of the graphene oxide-modified aluminosilicate mineral.
And (3) performance testing:
the concrete prepared in examples 1 to 5 of the present invention and comparative examples 1 to 4 was used as a sample for testing;
determining the dry apparent density of each test piece according to a drying method in the standard JGJ/T12-2019 technical Standard for lightweight aggregate concrete application;
carrying out compression strength and breaking strength tests according to standard GB/T17671-1999 Cement mortar Strength test method (ISO method);
the impact resistance test is referred to the standard CECS13:2009 "Standard of fiber concrete test method" prepares a round cake-shaped sample with the diameter of 150mm and the thickness of (63 +/-3) mm, the test height is designed to be 5000mm, a steel impact hammer with the weight of 5kg is selected, during the test, the well-maintained sample is taken out in advance, dried and then placed in the center of a chassis of an impact device, after an impact steel ball is placed in the center of the top surface of the sample, the impact steel ball placed on the top surface of the sample is impacted by freely falling along a guide pipe from 5000mm, one-time impact is a cycle, the condition that cracks appear on the surface (top surface and bottom surface) of the sample is carefully observed in the test process, the impact cycle is continuously and repeatedly carried out until the sample reaches the failure state, when the crack appears on the sample with the width of 5mm, the sample is regarded as the failure state, and the average value of 6 tests is taken as the final result.
The test results are shown in table 1 below:
TABLE 1
As can be seen from the above table 1, the concrete prepared by the invention has lower dry apparent density and good mechanical properties, and can be used for manufacturing hollow steel tube concrete rectangular beams.
The above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (10)
1. The concrete is characterized by being prepared from the following raw materials in parts by weight:
100-130 parts of cement, 300-350 parts of aggregate, 20-30 parts of basalt fiber, 10-20 parts of calcined clay, 15-30 parts of fly ash, 10-20 parts of graphene oxide modified aluminosilicate mineral, 3-5 parts of excitant, 10-20 parts of aerogel expanded perlite, 5-10 parts of redispersible latex powder and 40-60 parts of water.
2. The concrete according to claim 1, wherein the graphene oxide-modified aluminosilicate mineral is prepared by the following method:
adding aluminosilicate mineral into the graphene oxide dispersion liquid, packaging in a ball milling tank, carrying out ball milling for 18-24h, atomizing the obtained slurry, conveying the atomized slurry into a reactor maintained at a set temperature through nitrogen, quickly evaporating the solvent at a high temperature to form graphene oxide modified aluminosilicate mineral particles, and finally transferring the graphene oxide modified aluminosilicate mineral particles into a vacuum drying oven for complete drying treatment.
3. The concrete of claim 2, wherein the aluminosilicate mineral is halloysite.
4. The concrete according to claim 2, wherein the graphene oxide dispersion liquid is prepared by a brodi method, a staudenmier method or a hummers method, the graphene oxide dispersion liquid is prepared by using water and ethyl acetate as solvents, and the volume ratio of the water to the ethyl acetate is 15-20:1.
5. the concrete of claim 2, wherein the temperature of the reactor is 600-800 ℃.
6. The concrete of claim 1, wherein the activator comprises potash water glass and sodium hydroxide, and the mass ratio of the potash water glass to the sodium hydroxide is 1-3:3-5.
7. The concrete of claim 1, wherein the aerogel expanded perlite is prepared by the following method:
mixing nano-cellulose/SiO 2 Adding hydrosol into vacuum cylinder filled with expanded perlite, sealing the vacuum cylinder, starting vacuum pump, and regulating vacuum degree in the vacuum cylinder to control the impregnation adsorption pressure of the expanded perlite to obtain hydrosol/expanded perliteAnd (2) expanding the perlite compound, taking out the hydrosol/expanded perlite compound, sucking the hydrosol on the surface, aging at normal temperature for 24-48h, placing in water for aging for 24-48h, sequentially performing solvent replacement by using ethanol, n-hexane and a trimethylchlorosilane/n-hexane mixed solution, and drying at 60-100 ℃ for 4-8 h.
8. The concrete of claim 7, wherein the nanocellulose/SiO 2 The preparation method of the hydrosol comprises the following steps:
uniformly mixing water glass and water, adding a hydrochloric acid solution into the mixture under a stirring state to enable the pH of the solution to be 1-2, carrying out sealed stirring and hydrolysis for 1-2h, adding nano-cellulose, uniformly stirring, and adding ammonia water to adjust the pH of the solution to 8-9.
9. A method for preparing concrete according to any one of claims 1 to 8, wherein cement, aggregate, basalt fiber, calcined clay, fly ash, graphene oxide modified aluminosilicate mineral, and aerogel expanded perlite are mixed to obtain a mixed powder, an activator is added to a first portion of water to prepare a first solution, a re-dispersed latex powder is added to the remaining water to prepare a second solution, the mixed powder is mixed with the first solution, the second solution is added, the mixture is stirred uniformly, injected into a mold, the mold is removed after molding, and the concrete is cured to a specified age under standard curing conditions.
10. A rectangular hollow steel tube concrete beam, which is characterized by comprising an outer rectangular steel tube and an inner rectangular sleeve which are coaxial, wherein the concrete as claimed in any one of claims 1 to 8 is filled between the outer rectangular steel tube and the inner rectangular sleeve.
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