CN112645732A - Improved aerated concrete building block - Google Patents
Improved aerated concrete building block Download PDFInfo
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- CN112645732A CN112645732A CN202011607136.0A CN202011607136A CN112645732A CN 112645732 A CN112645732 A CN 112645732A CN 202011607136 A CN202011607136 A CN 202011607136A CN 112645732 A CN112645732 A CN 112645732A
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- CN
- China
- Prior art keywords
- aerated concrete
- parts
- concrete block
- nano tube
- carbon nano
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Classifications
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- 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
- 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
Abstract
The invention discloses an improved aerated concrete block which comprises the following raw materials in parts by weight; 100-150 parts of siliceous material, 22-45 parts of cement, 20-40 parts of quick lime, 5-15 parts of desulfurized gypsum, 0.2-0.25 part of aluminum powder and 0.2-0.5 part of modified carbon nano tube; the modified carbon nanotube is prepared by the following steps: placing carbon nanotube powder in a closed container, introducing nitrogen, adjusting the flow and pressure of the nitrogen, and simultaneously performing microwave irradiation to enable the gas in the cavity to absorb microwave energy and excite to generate plasma; ultrasonic irradiation is added, and nitrogen atoms after plasma ionization are deeply doped into the surface and the internal structure of the carbon nano tube; adding acetic acid solution of chitosan into the obtained carbon nano tube, reacting for 6-8h at 30-35 ℃, filtering, washing and drying to obtain the modified carbon nano tube material.
Description
Technical Field
The invention belongs to the technical field of concrete, and particularly relates to an aerated concrete block.
Background
The aerated concrete is a novel wall building material, and is characterized in that the aerated concrete is a very light novel heat-insulating building wall material. The aerated concrete technology begins one hundred years ago, and the technology of China begins later and is more than forty years behind the whole technology of China, but the development of the aerated concrete industry of China is really very rapid. The technical level of domestic aerated concrete can reach the international advanced level.
The aerated concrete has the greatest advantages that land resources are saved, a large amount of cultivated land is not wasted, the sources of raw materials of the aerated concrete are very wide, and ash sand, slag, fly ash, coal gangue and the like are used as raw materials of the aerated concrete. The aerated concrete has the advantages of excellent performance characteristics, very good processability, heat insulation and heat preservation capability, very strong plasticity, capability of being planed and sawed and very good processing characteristics.
The application of the aerated concrete is very wide, the aerated concrete is mainly used for wall materials, filling walls, floor slabs, roof slabs and other load-bearing wall materials in mechanical plants and civil buildings, non-load-bearing materials and filling enclosing walls around the state, and gradually, the aerated concrete becomes a leading product in the building material industry.
However, the aerated concrete also has the obvious defects of low strength, easy fragmentation, large shrinkage, low elastic modulus, frost damage resistance and unsuitability for use in a humid environment.
Disclosure of Invention
The invention aims to provide an improved aerated concrete block, the strength of the obtained aerated concrete block is improved, the aerated concrete block is not easy to crack, the elastic modulus is greatly improved, and the water absorption is obviously reduced.
In order to achieve the purpose, the technical scheme is as follows:
an improved aerated concrete block comprises the following raw materials in parts by weight;
100-150 parts of siliceous material, 22-45 parts of cement, 20-40 parts of quick lime, 5-15 parts of desulfurized gypsum, 0.2-0.25 part of aluminum powder and 0.2-0.5 part of modified carbon nano tube;
wherein the modified carbon nanotube is prepared by the following steps:
1) placing carbon nanotube powder in a closed container, introducing nitrogen, adjusting the flow and pressure of the nitrogen, and simultaneously performing microwave irradiation to enable the gas in the cavity to absorb microwave energy and excite to generate plasma;
2) ultrasonic irradiation is added, and nitrogen atoms after plasma ionization are deeply doped into the surface and the internal structure of the carbon nano tube;
3) adding acetic acid solution of chitosan into the obtained carbon nano tube, reacting for 6-8h at 30-35 ℃, filtering, washing and drying to obtain the modified carbon nano tube material.
According to the scheme, the cement is ordinary portland cement.
According to the scheme, the silicon dioxide content of the siliceous material is more than or equal to 85 wt%.
According to the scheme, the 180-mesh sieve residue of the quicklime is less than or equal to 20 percent, the digestion speed is greater than or equal to 5min, and the digestion temperature is greater than or equal to 65 ℃.
According to the scheme, the mass content of the active aluminum in the aluminum powder is more than or equal to 85 wt%.
According to the scheme, the microwave power in the step 1 is 100-110W, the nitrogen flow is 20-25sccm, the working pressure is 1-3 kPa, and the microwave irradiation time is 60-90 min.
According to the scheme, the ultrasonic frequency in the step 2 is 28-40 kHz; the irradiation time is 10-20 min.
According to the scheme, the concentration of the acetic acid solution of the chitosan in the step 3 is 0.01-0.05 g/mL.
Compared with the prior art, the invention has the beneficial effects that:
the plasma generated by the excitation of the introduced nitrogen gas is doped into the carbon nano tube, so that the reaction activity of the carbon nano tube is improved, and a foundation is provided for the next grafting reaction.
The ultrasonic treatment further improves the infiltration efficiency of the nitrogen plasma to the carbon nano tube and further improves the reaction activity.
The carbon nano tube modified by chitosan grafting is applied to the aerated concrete, so that the crystallization nucleation effect is brought, the elastic modulus of the aerated concrete is greatly improved, the water absorption is obviously reduced, and the obtained product becomes firm and is not easy to crack.
Detailed Description
The following examples further illustrate the technical solutions of the present invention, but should not be construed as limiting the scope of the present invention.
Preparing a modified carbon nanotube material:
1) placing carbon nanotube powder in a closed container, introducing nitrogen, adjusting the flow and pressure of the nitrogen, and simultaneously performing microwave irradiation to enable the gas in the cavity to absorb microwave energy and excite to generate plasma; wherein the microwave power is 100-110W, the nitrogen flow is 20-25sccm, the working gas pressure is 1-3 kPa, and the microwave irradiation time is 60-90 min;
2) ultrasonic irradiation of 28-40kHz is added, nitrogen atoms after plasma treatment are deeply doped into the surface and the internal structure of the carbon nano tube, and the irradiation time is 10-20 min;
3) adding 0.01-0.05g/mL of chitosan acetic acid solution into the obtained carbon nano tube, reacting for 6-8h at 30-35 ℃, filtering, washing and drying to obtain the modified carbon nano tube material.
Example 1
125 parts of river sand, 30 parts of cement, 30 parts of quicklime, 10 parts of desulfurized gypsum, 0.2 part of aluminum powder and 0.3 part of modified carbon nano tube; the aerated concrete block is prepared according to the traditional process.
Comparative example 1
The raw materials and preparation process were kept the same as in example 1 without adding modified carbon nanotubes.
The performance test of the aerated concrete block samples obtained in the example 1 and the comparative example 1 shows that the compressive strength of the example 1 is improved by 25 percent compared with the comparative example 1, the drying shrinkage value is reduced by 0.3-0.5mm/m, and the heat conductivity coefficient is not influenced.
Example 2
150 parts of silica sand, 22 parts of cement, 20 parts of quicklime, 15 parts of desulfurized gypsum, 0.25 part of aluminum powder and 0.5 part of modified carbon nano tube; the aerated concrete block is prepared according to the traditional process.
Comparative example 2
The raw materials and preparation process were kept the same as in example 2 without adding modified carbon nanotubes.
The performance test of the aerated concrete block samples obtained in the example 2 and the comparative example 2 shows that the compressive strength of the aerated concrete block sample obtained in the example 2 is improved by 18 percent compared with the comparative example 2, the drying shrinkage value is reduced by 0.15-0.2mm/m, and the heat conductivity coefficient is not influenced.
Example 3
100 parts of silica sand, 45 parts of cement, 40 parts of quicklime, 5 parts of desulfurized gypsum, 0.23 part of aluminum powder and 0.2 part of modified carbon nano tube; the aerated concrete block is prepared according to the traditional process.
Comparative example 3
The raw materials and preparation process were kept the same as in example 3 without adding modified carbon nanotubes.
The performance test of the aerated concrete block samples obtained in the example 3 and the comparative example 3 shows that the compressive strength of the aerated concrete block sample obtained in the example 3 is improved by 20 percent compared with the comparative example 3, the drying shrinkage value is reduced by 0.2-0.3mm/m, and the heat conductivity coefficient is not influenced.
Claims (8)
1. An improved aerated concrete block is characterized by comprising the following raw materials in parts by weight;
100-150 parts of siliceous material, 22-45 parts of cement, 20-40 parts of quick lime, 5-15 parts of desulfurized gypsum, 0.2-0.25 part of aluminum powder and 0.2-0.5 part of modified carbon nano tube;
wherein the modified carbon nanotube is prepared by the following steps:
1) placing carbon nanotube powder in a closed container, introducing nitrogen, adjusting the flow and pressure of the nitrogen, and simultaneously performing microwave irradiation to enable the gas in the cavity to absorb microwave energy and excite to generate plasma;
2) ultrasonic irradiation is added, and nitrogen atoms after plasma ionization are deeply doped into the surface and the internal structure of the carbon nano tube;
3) adding acetic acid solution of chitosan into the obtained carbon nano tube, reacting for 6-8h at 30-35 ℃, filtering, washing and drying to obtain the modified carbon nano tube material.
2. An improved aerated concrete block according to claim 1 wherein the cement is portland cement.
3. The improved aerated concrete block of claim 1, wherein the siliceous material has a silica content of 85% by weight or greater.
4. The improved aerated concrete block as claimed in claim 1, wherein the lime has a 180 mesh surplus of less than or equal to 20%, a digestion speed of greater than or equal to 5min, and a digestion temperature of greater than or equal to 65 ℃.
5. The improved aerated concrete block of claim 1, wherein the mass content of the active aluminum in the aluminum powder is greater than or equal to 85 wt%.
6. The improved aerated concrete block as claimed in claim 1, wherein in step 1, the microwave power is 100-.
7. The improved aerated concrete block of claim 1, wherein in step 2 the ultrasonic frequency is between 28 and 40 kHz; the irradiation time is 10-20 min.
8. The improved aerated concrete block of claim 1, wherein the concentration of the acetic acid solution of chitosan in step 3 is 0.01-0.05 g/mL.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011607136.0A CN112645732A (en) | 2020-12-30 | 2020-12-30 | Improved aerated concrete building block |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011607136.0A CN112645732A (en) | 2020-12-30 | 2020-12-30 | Improved aerated concrete building block |
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| Publication Number | Publication Date |
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| CN112645732A true CN112645732A (en) | 2021-04-13 |
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| CN202011607136.0A Pending CN112645732A (en) | 2020-12-30 | 2020-12-30 | Improved aerated concrete building block |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113860287A (en) * | 2021-09-22 | 2021-12-31 | 江西铜业技术研究院有限公司 | System and method for preparing single-walled carbon nanotube by plasma arc method |
-
2020
- 2020-12-30 CN CN202011607136.0A patent/CN112645732A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113860287A (en) * | 2021-09-22 | 2021-12-31 | 江西铜业技术研究院有限公司 | System and method for preparing single-walled carbon nanotube by plasma arc method |
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