CN116573880A - High-performance admixture for sprayed concrete, application and concrete - Google Patents
High-performance admixture for sprayed concrete, application and concrete Download PDFInfo
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- CN116573880A CN116573880A CN202310560875.6A CN202310560875A CN116573880A CN 116573880 A CN116573880 A CN 116573880A CN 202310560875 A CN202310560875 A CN 202310560875A CN 116573880 A CN116573880 A CN 116573880A
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- 239000011378 shotcrete Substances 0.000 title claims abstract description 60
- 239000004567 concrete Substances 0.000 title claims description 22
- 239000000843 powder Substances 0.000 claims abstract description 22
- 229920002907 Guar gum Polymers 0.000 claims abstract description 17
- 229960002154 guar gum Drugs 0.000 claims abstract description 17
- 235000010417 guar gum Nutrition 0.000 claims abstract description 17
- 239000000665 guar gum Substances 0.000 claims abstract description 17
- 235000007164 Oryza sativa Nutrition 0.000 claims abstract description 16
- 239000000839 emulsion Substances 0.000 claims abstract description 16
- NLYAJNPCOHFWQQ-UHFFFAOYSA-N kaolin Chemical compound O.O.O=[Al]O[Si](=O)O[Si](=O)O[Al]=O NLYAJNPCOHFWQQ-UHFFFAOYSA-N 0.000 claims abstract description 16
- 235000009566 rice Nutrition 0.000 claims abstract description 16
- 229910052500 inorganic mineral Inorganic materials 0.000 claims abstract description 12
- 239000011707 mineral Substances 0.000 claims abstract description 12
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 18
- 239000002245 particle Substances 0.000 claims description 16
- 241000209094 Oryza Species 0.000 claims description 15
- 238000002360 preparation method Methods 0.000 claims description 9
- 239000000463 material Substances 0.000 claims description 8
- 230000000694 effects Effects 0.000 claims description 7
- 238000000227 grinding Methods 0.000 claims description 7
- 238000001816 cooling Methods 0.000 claims description 6
- 238000001354 calcination Methods 0.000 claims description 5
- 229910021487 silica fume Inorganic materials 0.000 claims description 5
- 235000013339 cereals Nutrition 0.000 claims description 4
- 239000005995 Aluminium silicate Substances 0.000 claims description 3
- 235000012211 aluminium silicate Nutrition 0.000 claims description 3
- 239000010903 husk Substances 0.000 claims description 3
- 238000012216 screening Methods 0.000 claims description 3
- 238000007873 sieving Methods 0.000 claims description 3
- 239000002893 slag Substances 0.000 claims description 3
- 238000005507 spraying Methods 0.000 abstract description 13
- 239000002994 raw material Substances 0.000 abstract description 4
- 238000011031 large-scale manufacturing process Methods 0.000 abstract description 2
- 238000004519 manufacturing process Methods 0.000 abstract description 2
- 240000007594 Oryza sativa Species 0.000 abstract 1
- 239000004568 cement Substances 0.000 description 14
- 238000010276 construction Methods 0.000 description 13
- 238000000034 method Methods 0.000 description 13
- 239000002956 ash Substances 0.000 description 10
- 238000002156 mixing Methods 0.000 description 10
- 238000012360 testing method Methods 0.000 description 10
- 230000000052 comparative effect Effects 0.000 description 8
- 239000010881 fly ash Substances 0.000 description 8
- 239000000203 mixture Substances 0.000 description 8
- 239000003638 chemical reducing agent Substances 0.000 description 7
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 6
- 239000004576 sand Substances 0.000 description 6
- 239000004575 stone Substances 0.000 description 6
- 230000008569 process Effects 0.000 description 5
- 238000003756 stirring Methods 0.000 description 5
- 238000013329 compounding Methods 0.000 description 4
- AXCZMVOFGPJBDE-UHFFFAOYSA-L calcium dihydroxide Chemical compound [OH-].[OH-].[Ca+2] AXCZMVOFGPJBDE-UHFFFAOYSA-L 0.000 description 2
- 239000000920 calcium hydroxide Substances 0.000 description 2
- 229910001861 calcium hydroxide Inorganic materials 0.000 description 2
- 239000000378 calcium silicate Substances 0.000 description 2
- 229910052918 calcium silicate Inorganic materials 0.000 description 2
- OYACROKNLOSFPA-UHFFFAOYSA-N calcium;dioxido(oxo)silane Chemical compound [Ca+2].[O-][Si]([O-])=O OYACROKNLOSFPA-UHFFFAOYSA-N 0.000 description 2
- 239000000428 dust Substances 0.000 description 2
- 230000036571 hydration Effects 0.000 description 2
- 238000006703 hydration reaction Methods 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 239000002002 slurry Substances 0.000 description 2
- 239000002253 acid Substances 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 230000004888 barrier function Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000004566 building material Substances 0.000 description 1
- OSMSIOKMMFKNIL-UHFFFAOYSA-N calcium;silicon Chemical compound [Ca]=[Si] OSMSIOKMMFKNIL-UHFFFAOYSA-N 0.000 description 1
- 239000003153 chemical reaction reagent Substances 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000003628 erosive effect Effects 0.000 description 1
- 229910001653 ettringite Inorganic materials 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 239000007791 liquid phase Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000011056 performance test Methods 0.000 description 1
- 229920002689 polyvinyl acetate Polymers 0.000 description 1
- 239000011118 polyvinyl acetate Substances 0.000 description 1
- 238000005086 pumping Methods 0.000 description 1
- 230000009257 reactivity Effects 0.000 description 1
- 239000011435 rock Substances 0.000 description 1
- 239000002910 solid waste Substances 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
- 239000007858 starting material Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B40/00—Processes, in general, for influencing or modifying the properties of mortars, concrete or artificial stone compositions, e.g. their setting or hardening ability
- C04B40/0028—Aspects relating to the mixing step of the mortar preparation
- C04B40/0039—Premixtures of ingredients
-
- 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
- C04B2111/00034—Physico-chemical characteristics of the mixtures
- C04B2111/00146—Sprayable or pumpable mixtures
- C04B2111/00155—Sprayable, i.e. concrete-like, materials able to be shaped by spraying instead of by casting, e.g. gunite
-
- 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
Abstract
The invention provides a high-performance admixture for sprayed concrete, which comprises the following components in parts by mass: 60-65 parts of a first component and 35-40 parts of a second component. The first component comprises the following components in parts by weight: 60-70 parts of superfine mineral admixture, 15-20 parts of redispersible emulsion powder and 15-20 parts of guar gum. The second component comprises the following components in parts by mass: 50-70 parts of metakaolin and 30-50 parts of ground rice hull ash. The admixture for high-performance sprayed concrete improves the cohesiveness of the sprayed concrete, reduces the rebound rate, improves the one-time spraying thickness and the early strength of the sprayed concrete, and increases the compactness of the sprayed concrete. Meanwhile, the admixture for high-performance sprayed concrete improves the impermeability and durability of the sprayed concrete. The admixture for high-performance sprayed concrete has the advantages of simple production process and low raw material cost, and is suitable for large-scale production.
Description
Technical Field
The invention relates to the field of building materials, in particular to an admixture for high-performance sprayed concrete, application and concrete.
Background
The sprayed concrete is an important component of tunnel engineering, and the construction performance, the mechanical property and durability after setting and hardening, and the performance in the service process are important factors influencing the construction progress, the construction quality and the later use state of the tunnel engineering. Construction of sprayed concrete is divided into dry spraying construction and wet spraying construction according to whether water is added to concrete mixture before spraying for stirring. The dry spraying method is used for construction, and dust pollution is serious in the spraying construction process, so that the damage to constructors is large, and the dry spraying method is rarely used at present. The wet spraying method effectively reduces dust pollution in the spraying process, reduces the rebound rate of sprayed concrete and obviously improves the construction efficiency. Currently, wet-spraying construction has become a major construction method for tunnel shotcrete. However, due to the adaptability problems of the accelerator to other raw materials of concrete (such as cement, water reducer, pumping aid and aggregate) and the environment, the phenomena of high rebound rate, insufficient early strength of concrete and the like are still difficult to avoid in the construction process of spraying concrete by adopting a wet spraying method. These phenomena will seriously reduce the construction efficiency of the sprayed concrete, cause the waste of materials, and cause the engineering problems of shrinkage cracking, leakage and the like of the sprayed concrete structure. On the other hand, the conventional shotcrete only considers the compressive strength index requirement in the process of designing the mixing ratio, and hardly considers the durability index requirement, and all the problems need to be further solved.
Disclosure of Invention
In order to overcome the existing technology: 1. sometimes, the phenomena of high rebound rate, insufficient early strength of concrete and the like are still difficult to avoid. 2. The invention aims to provide a high-performance admixture for sprayed concrete, which only considers the compressive strength index requirement and does not consider the problem of the durability index requirement, and comprises the following components in parts by mass: 60-65 parts of a first component and 35-40 parts of a second component. The first component comprises the following components in parts by weight: 60-70 parts of superfine mineral admixture, 15-20 parts of redispersible emulsion powder and 15-20 parts of guar gum. The second component comprises the following components in parts by mass: 50-70 parts of metakaolin and 30-50 parts of ground rice hull ash.
Exemplary of the inventionThere is provided an ultra-fine mineral admixture comprising: at least one of silica fume and superfine slag powder, and the particle size d of the superfine mineral admixture 50 ≤5μm。
The invention provides redispersible emulsion powder, which comprises the following components: at least one of 5010N-type redispersible emulsion powder and 5024N-type redispersible emulsion powder.
The invention provides guar gum, which is characterized in that: white to yellow instant powder, and when the guar gum is dissolved in water to form a solution with the mass fraction of 1%, the apparent viscosity of the guar gum is more than or equal to 6000 mPa.s.
The invention provides metakaolin, which is prepared from the following components in percentage by weight: powdery particles with the particle size d50 less than or equal to 5 mu m.
The invention provides a preparation method of metakaolin, which comprises the following steps: calcining kaolin at 800-900 ℃ for 2-3h, cooling, grinding, and screening the product with the target particle size.
The invention provides an exemplary method for grinding rice hull ash, which comprises the following steps: and d50 is less than or equal to 5 mu m, and 28d activity index is more than or equal to 85 percent.
The invention provides a preparation method of ground rice hull ash, which comprises the following steps: calcining rice husk at 600-700 deg.c for 2-3 hr, cooling, grinding and sieving to obtain the product with target grain size.
The second object of the present invention is to provide an application of the admixture for high-performance shotcrete, wherein the admixture is the admixture for high-performance shotcrete, and the admixture is applied to shotcrete; the high-performance admixture for sprayed concrete accounts for 5-10% of the mass of the concrete cementing material in the sprayed concrete.
The invention provides a method for using a high-performance admixture for sprayed concrete in sprayed concrete, which comprises the following steps: the concrete mixture is stirred for 3-5min, and then the admixture for high-performance sprayed concrete is mixed into the concrete mixture at a nozzle.
The invention further aims to provide concrete which comprises 5-10% of the admixture for the high-performance sprayed concrete, wherein the admixture is prepared by mixing the concrete cementing material with the admixture.
Compared with the prior art, the invention has at least one of the following beneficial effects:
1. the admixture for high-performance sprayed concrete improves the cohesiveness of the sprayed concrete, reduces the rebound rate and improves the one-time spraying thickness.
2. The admixture for high-performance sprayed concrete improves the early strength of the sprayed concrete and the compactness of the sprayed concrete.
3. The admixture for high-performance sprayed concrete improves the impermeability and durability of the sprayed concrete.
4. The admixture for high-performance sprayed concrete has the advantages of simple production process and low raw material cost, and is suitable for large-scale production.
Detailed Description
In order to make the technical problems, technical schemes and technical effects to be solved more clearly apparent, the technical schemes of the invention are clearly and completely described in detail below by combining with the embodiments. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention. Unless otherwise indicated, the starting materials and reagents used in the following examples were either commercially available or were prepared by known methods. In the following examples, unless otherwise indicated, raw material products or processing techniques are all typical commercial products or conventional processing techniques in the art.
In the following examples and comparative examples:
the superfine mineral admixture is as follows: particle diameter d 50 Silica fume of less than or equal to 5 mu m.
The redispersible emulsion powder comprises: 5010N type redispersible emulsion powder.
Guar gum is: white to yellow instant powder, and when the guar gum is dissolved in water to form a solution with the mass fraction of 1%, the apparent viscosity of the guar gum is more than or equal to 6000 mPa.s.
Metakaolin is: particle diameter d 50 Powdery particles less than or equal to 5 mu m, and the preparation method comprises the following steps: subjecting kaolin to a high temperature of 900 DEG CCalcining for 2h, cooling, grinding and screening the product with the target particle size.
The ground rice hull ash is as follows: particle diameter d 50 Powdery particles with an activity index of less than or equal to 5 mu m and 28d of more than or equal to 85 percent are prepared by the following steps: calcining rice husk at 700 deg.c for 2 hr, cooling, grinding and sieving to obtain the product with target grain size.
The cement is as follows: conch brand P.O 42.5.5 cement.
The sand is as follows: ordinary river sand with fineness modulus of 2.6.
The stone is as follows: crushed stone with the grain diameter of 5-15 mm.
The water reducer is as follows: polycarboxylic acid water reducer.
The accelerator is as follows: commercially available alkali-free liquid accelerator.
Example 1
The admixture for the high-performance sprayed concrete comprises the following components in parts by mass: 60 parts of a first component and 40 parts of a second component. The first component comprises the following components in parts by weight: 60 parts of superfine mineral admixture, 20 parts of redispersible emulsion powder and 20 parts of guar gum. The second component comprises the following components in parts by mass: 50 parts of metakaolin and 50 parts of ground rice hull ash.
Test pieces were prepared according to the compounding ratios in the following table.
The preparation method of the test piece comprises the following steps:
s1, mixing P.O 42.5.5 cement, fly ash, sand, stone, water and a water reducing agent according to a proportion and stirring for 3min.
S2, the admixture for high-performance sprayed concrete obtained in the embodiment is mixed into a concrete mixture at a nozzle.
S3, when the product is manufactured, an accelerator is added at the nozzle, wherein the mixing amount of the accelerator is 7% of the total mass of all cementing materials (cement, fly ash and admixture for high-performance sprayed concrete).
Example 2
The admixture for the high-performance sprayed concrete comprises the following components in parts by mass: 65 parts of the first component and 35 parts of the second component. The first component comprises the following components in parts by weight: 70 parts of superfine mineral admixture, 15 parts of redispersible emulsion powder and 15 parts of guar gum. The second component comprises the following components in parts by mass: 70 parts of metakaolin and 30 parts of ground rice hull ash.
Test pieces were prepared according to the compounding ratios in the following table.
The preparation method of the test piece comprises the following steps:
s1, mixing P.O 42.5.5 cement, fly ash, sand, stone, water and a water reducing agent according to a proportion and stirring for 3min.
S2, the admixture for high-performance sprayed concrete obtained in the embodiment is mixed into a concrete mixture at a nozzle.
S3, when the product is manufactured, an accelerator is added at the nozzle, wherein the mixing amount of the accelerator is 7% of the total mass of all cementing materials (cement, fly ash and admixture for high-performance sprayed concrete).
Example 3
The admixture for the high-performance sprayed concrete comprises the following components in parts by mass: 63 parts of first component and 37 parts of second component. The first component comprises the following components in parts by weight: 64 parts of superfine mineral admixture, 17 parts of redispersible emulsion powder and 19 parts of guar gum. The second component comprises the following components in parts by mass: 60 parts of metakaolin and 40 parts of ground rice hull ash.
Test pieces were prepared according to the compounding ratios in the following table.
The preparation method of the test piece comprises the following steps:
s1, mixing P.O 42.5.5 cement, fly ash, sand, stone, water and a water reducing agent according to a proportion and stirring for 3min.
S2, the admixture for high-performance sprayed concrete obtained in the embodiment is mixed into a concrete mixture at a nozzle.
S3, when the product is manufactured, an accelerator is added at the nozzle, wherein the mixing amount of the accelerator is 7% of the total mass of all cementing materials (cement, fly ash and admixture for high-performance sprayed concrete).
Comparative example 1
Test pieces were prepared according to the compounding ratios in the following table.
The preparation method of the test piece comprises the following steps:
s1, mixing P.O 42.5.5 cement, fly ash, sand, stone, water and a water reducing agent according to a proportion and stirring for 3min.
S2, when the product is manufactured, an accelerator is added at the nozzle, wherein the mixing amount of the accelerator is 7% of the total mass of all cementing materials (cement, fly ash and admixture for high-performance sprayed concrete).
The above examples and comparative examples were tested using a wet spray technique, with the test section being a class iii surrounding rock. The test results are shown in the following table:
TABLE 1 results of Performance test of examples and comparative examples
As can be seen from the above table, examples 1 to 3, to which the inventive blend was added, all had significant improvements in sidewall rebound, dome rebound, 1d compressive strength and 28d barrier rating compared to comparative example 1, to which the inventive blend was not added, wherein: the sidewall rebound rate was reduced below 43.8% for comparative example 1, the dome rebound rate was reduced below 49.7% for comparative example 1, the 1d compressive strength was increased above 153.3% for comparative example 1, and the 28d permeation resistance rating was increased to P6.
The reason for this is that: in the invention, the silica fume and the superfine slag powder are common superfine mineral admixture which is filled in gaps formed by overlapping cement particles to play a role of a ball bearing; the main component of the redispersible emulsion powder is ethylene-polyvinyl acetate, and the redispersible emulsion powder is dispersed in water to enhance the liquid phase consistency; guar gum is a common tackifying and water-retaining component, and after being dissolved in water, the guar gum greatly increases the viscosity of water, so that concrete sprayed on a base layer is not easy to fall down, and the rebound rate is reduced. The metakaolin prepared by the method has high reactivity and obvious early strength effect. The finely ground rice hull ash prepared by the method not only utilizes agricultural solid waste, but also provides an active admixture with activity close to that of silica fume for concrete. Meanwhile, metakaolin reacts with calcium hydroxide which is a cement hydration product to form ettringite and hydrated calcium silicate, and rice hull ash reacts with calcium hydroxide which is a cement hydration product to form volcanic ash, and the formed product is mainly hydrated calcium silicate with low calcium-silicon ratio, and is filled in capillary holes, so that the strength of the slurry is improved, and the impermeability and erosion resistance of the slurry are greatly improved. The effect of the admixture of the invention is that the side wall rebound rate and the vault rebound rate are obviously reduced, and the 1d compressive strength and the impermeability are obviously improved after the admixture is added into concrete.
Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made therein without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (10)
1. The admixture for the high-performance sprayed concrete is characterized by comprising the following components in parts by mass: 60-65 parts of a first component and 35-40 parts of a second component; the first component comprises the following components in parts by weight: 60-70 parts of superfine mineral admixture, 15-20 parts of redispersible emulsion powder and 15-20 parts of guar gum; the second component comprises the following components in parts by mass: 50-70 parts of metakaolin and 30-50 parts of ground rice hull ash.
2. The admixture for high performance shotcrete according to claim 1, wherein the ultra fine mineral admixture comprises: at least one of silica fume and superfine slag powder, and the particle size d of the superfine mineral admixture 50 ≤5μm。
3. The admixture for high-performance shotcrete according to claim 1, wherein the redispersible emulsion powder comprises: at least one of 5010N-type redispersible emulsion powder and 5024N-type redispersible emulsion powder.
4. The admixture for high performance shotcrete according to claim 1, wherein said guar gum is a white to yellow instant powder; when the guar gum is dissolved in water to form a solution with the mass fraction of 1%, the apparent viscosity of the guar gum is more than or equal to 6000 mPa.s.
5. The admixture for high performance shotcrete according to claim 1, wherein the metakaolin is: particle diameter d 50 Powdery particles less than or equal to 5 mu m.
6. The admixture for high-performance shotcrete according to claim 5, wherein the preparation method of metakaolin is as follows: calcining kaolin at 800-900 ℃ for 2-3h, cooling, grinding, and screening the product with the target particle size.
7. The admixture for high performance shotcrete according to claim 1, wherein the ground rice hull ash is: d, d 50 Powdery particles with an activity index of less than or equal to 5 mu m and 28d of more than or equal to 85 percent.
8. The admixture for high performance shotcrete according to claim 7, wherein the preparation method of the ground rice hull ash comprises the steps of: calcining rice husk at 600-700 deg.c for 2-3 hr, cooling, grinding and sieving to obtain the product with target grain size.
9. Use of the admixture for high-performance shotcrete according to any one of claims 1 to 8 in shotcrete; the high-performance admixture for sprayed concrete accounts for 5-10% of the mass of the concrete cementing material in the sprayed concrete.
10. A concrete characterized in that the concrete comprises 5-10% of the admixture for the high-performance sprayed concrete, wherein the admixture is the admixture for the high-performance sprayed concrete according to any one of claims 1-8.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310560875.6A CN116573880A (en) | 2023-05-18 | 2023-05-18 | High-performance admixture for sprayed concrete, application and concrete |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310560875.6A CN116573880A (en) | 2023-05-18 | 2023-05-18 | High-performance admixture for sprayed concrete, application and concrete |
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| Publication Number | Publication Date |
|---|---|
| CN116573880A true CN116573880A (en) | 2023-08-11 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202310560875.6A Pending CN116573880A (en) | 2023-05-18 | 2023-05-18 | High-performance admixture for sprayed concrete, application and concrete |
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| Country | Link |
|---|---|
| CN (1) | CN116573880A (en) |
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- 2023-05-18 CN CN202310560875.6A patent/CN116573880A/en active Pending
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