CN114956710A - High-performance fly ash sprayed concrete for mudstone tunnel and preparation method thereof - Google Patents
High-performance fly ash sprayed concrete for mudstone tunnel and preparation method thereof Download PDFInfo
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- CN114956710A CN114956710A CN202210193900.7A CN202210193900A CN114956710A CN 114956710 A CN114956710 A CN 114956710A CN 202210193900 A CN202210193900 A CN 202210193900A CN 114956710 A CN114956710 A CN 114956710A
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- 239000010881 fly ash Substances 0.000 title claims abstract description 79
- 239000011378 shotcrete Substances 0.000 title claims abstract description 51
- 238000002360 preparation method Methods 0.000 title claims abstract description 9
- 239000004567 concrete Substances 0.000 claims abstract description 45
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 33
- 239000000835 fiber Substances 0.000 claims abstract description 29
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 28
- 239000010959 steel Substances 0.000 claims abstract description 28
- 239000004568 cement Substances 0.000 claims abstract description 17
- 239000003638 chemical reducing agent Substances 0.000 claims abstract description 15
- 239000011435 rock Substances 0.000 claims abstract description 13
- 239000007788 liquid Substances 0.000 claims abstract description 10
- 239000004576 sand Substances 0.000 claims abstract description 6
- 239000000843 powder Substances 0.000 claims abstract description 5
- 229910052602 gypsum Inorganic materials 0.000 claims abstract description 4
- 239000010440 gypsum Substances 0.000 claims abstract description 4
- 239000002893 slag Substances 0.000 claims abstract description 4
- 239000004575 stone Substances 0.000 claims abstract description 4
- 238000002156 mixing Methods 0.000 claims description 11
- 238000005507 spraying Methods 0.000 claims description 8
- 238000000034 method Methods 0.000 claims description 7
- 238000003756 stirring Methods 0.000 claims description 7
- 238000010276 construction Methods 0.000 claims description 5
- 239000000463 material Substances 0.000 claims description 5
- 239000002253 acid Substances 0.000 claims description 3
- 238000005303 weighing Methods 0.000 claims description 3
- 239000003795 chemical substances by application Substances 0.000 abstract description 2
- 230000000694 effects Effects 0.000 description 16
- 238000011049 filling Methods 0.000 description 9
- 239000002245 particle Substances 0.000 description 8
- 229910052500 inorganic mineral Inorganic materials 0.000 description 7
- 239000011707 mineral Substances 0.000 description 7
- 239000000203 mixture Substances 0.000 description 5
- 230000000052 comparative effect Effects 0.000 description 4
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 4
- 229910052742 iron Inorganic materials 0.000 description 3
- 239000011148 porous material Substances 0.000 description 3
- LRDIEHDJWYRVPT-UHFFFAOYSA-N 4-amino-5-hydroxynaphthalene-1-sulfonic acid Chemical compound C1=CC(O)=C2C(N)=CC=C(S(O)(=O)=O)C2=C1 LRDIEHDJWYRVPT-UHFFFAOYSA-N 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 2
- 229910052782 aluminium Inorganic materials 0.000 description 2
- 239000002956 ash Substances 0.000 description 2
- 238000005452 bending Methods 0.000 description 2
- 229910052791 calcium Inorganic materials 0.000 description 2
- 229910052799 carbon Inorganic materials 0.000 description 2
- 238000001514 detection method Methods 0.000 description 2
- 239000012535 impurity Substances 0.000 description 2
- -1 inorganic acid salt Chemical class 0.000 description 2
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000005204 segregation Methods 0.000 description 2
- 238000010008 shearing Methods 0.000 description 2
- 229910052814 silicon oxide Inorganic materials 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 229910052717 sulfur Inorganic materials 0.000 description 2
- 239000011398 Portland cement Substances 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000002734 clay mineral Substances 0.000 description 1
- 238000009833 condensation Methods 0.000 description 1
- 230000005494 condensation Effects 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000018044 dehydration Effects 0.000 description 1
- 238000006297 dehydration reaction Methods 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000010433 feldspar Substances 0.000 description 1
- 230000036571 hydration Effects 0.000 description 1
- 238000006703 hydration reaction Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 239000010453 quartz Substances 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 238000010517 secondary reaction Methods 0.000 description 1
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 1
- 239000002002 slurry Substances 0.000 description 1
- 238000001179 sorption measurement Methods 0.000 description 1
- 239000007921 spray 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
- 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
- C04B18/00—Use of agglomerated or waste materials or refuse as fillers for mortars, concrete or artificial stone; Treatment of agglomerated or waste materials or refuse, specially adapted to enhance their filling properties in mortars, concrete or artificial stone
- C04B18/04—Waste materials; Refuse
- C04B18/06—Combustion residues, e.g. purification products of smoke, fumes or exhaust gases
- C04B18/08—Flue dust, i.e. fly ash
-
- 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
- C04B2111/00474—Uses not provided for elsewhere in C04B2111/00
- C04B2111/00724—Uses not provided for elsewhere in C04B2111/00 in mining operations, e.g. for backfilling; in making tunnels or galleries
-
- 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 discloses high-performance fly ash sprayed concrete for a mudstone tunnel and a preparation method thereof, and the high-performance fly ash sprayed concrete comprises basic concrete, fly ash, steel fibers and a mixed admixture, wherein the basic concrete comprises 372 parts by mass of cement, 929 parts by mass of medium sand, 929 parts by mass of broken stone, 177 parts by mass of water, 4.13 parts by mass of a water reducing agent and 11.6-24.78 parts by mass of an alkali-free liquid accelerating agent, the volume ratio of the steel fibers is 1-2%, and the mixed admixture comprises 25 parts by mass of fly ash, 10.5 parts by mass of slag powder and 5.5 parts by mass of gypsum. The invention solves the problems that the stability of surrounding rocks of the mudstone tunnel is poor, and the primary support of the mudstone tunnel adopts the traditional concrete and cannot provide higher strength and overall mechanical performance.
Description
Technical Field
The invention relates to the technical field of tunnel construction, in particular to high-performance fly ash sprayed concrete for a mudstone tunnel and a preparation method thereof.
Background
Mudstone is mainly composed of clay minerals and contains a part of clastic minerals such as feldspar, quartz and the like. The shale of the mudstone tunnel is cemented, the rock is soft, and the mudstone tunnel has the characteristics of dehydration cracking, water absorption softening and the like, and the rock core is mostly in a broken shape and a short column shape. The ultimate displacement of the mudstone tunnel has small difference, the distribution of surrounding rock and primary support pressure has the characteristic of nonuniformity, the contact pressure between the primary lining is increased rapidly firstly and then reduced gradually, and then the stability tends to be stable, and the stability value is small as a whole. The obvious rheological property of the mudstone tunnel causes the stability of the surrounding rock of the mudstone tunnel to be poor, the stress of the surrounding rock is released quickly in the early stage, and the deformation pressure in the later stage lasts for a long time.
Therefore, the initial support of the mudstone tunnel needs to adopt concrete with high working performance. Therefore, aiming at the characteristics of the mudstone tunnel, the high-working-performance shotcrete for the mudstone tunnel needs to be designed and developed urgently.
Disclosure of Invention
In order to overcome the defects in the prior art, the high-performance fly ash sprayed concrete for the mudstone tunnel and the preparation method thereof are provided, so that the problems that the stability of surrounding rocks of the mudstone tunnel is poor, and the conventional concrete for primary support of the mudstone tunnel cannot provide high strength and overall mechanical performance are solved.
In order to achieve the purpose, the high-performance fly ash sprayed concrete for the mudstone tunnel comprises basic concrete, fly ash, steel fibers and a mixed admixture, wherein the basic concrete comprises 372 parts by mass of cement, 929 parts by mass of medium sand, 929 parts by mass of broken stone, 177 parts by mass of water, 4.13 parts by mass of a water reducing agent and 11.6-24.78 parts by mass of an alkali-free liquid accelerator, the volume ratio of the steel fibers is 1-2%, and the mixed admixture comprises 25 parts by mass of fly ash, 10.5 parts by mass of slag powder and 5.5 parts by mass of gypsum.
Further, the base concrete includes 24.78 parts by mass of an alkali-free liquid accelerator.
Further, the volume fraction of the steel fiber is 2%.
Further, it is characterized byThe fineness of the fly ash is less than 12, the water requirement of the fly ash is less than or equal to 95 percent, the ignition loss of the fly ash is less than or equal to 5 percent, the water content of the fly ash is less than or equal to 1 percent, and the SO of the fly ash 3 The content is less than or equal to 3 percent.
Further, the water reducing agent is a polycarboxylic acid high-performance water reducing agent.
The invention provides a preparation method of high-performance fly ash sprayed concrete for a mudstone tunnel, which comprises the following steps:
respectively weighing basic concrete, fly ash, steel fiber and mixed admixture;
uniformly mixing cement, medium sand, gravel, a water reducing agent and water in the basic concrete with a mixed admixture, and adding the steel fiber in the mixing process to obtain a mixed admixture;
before wet-spraying and spraying the primary support of the construction tunnel on the mudstone surrounding rock, adding the alkali-free liquid accelerator of the basic concrete into the mixed material and uniformly stirring to prepare the high-performance fly ash sprayed concrete for the mudstone tunnel.
The high-performance fly ash shotcrete for the mudstone tunnel has the beneficial effects that the mechanical property and the filling effect of the concrete are greatly improved, the setting time is further shortened, the rebound rate is further reduced, the workability and the slump are increased, and the overall working performance of the shotcrete is improved. On the other hand, the mixed admixture of the high-performance fly ash shotcrete for mudstone tunnel of the present invention comprises a mixture containing at least oxides of Si, Al, Fe, Ca, S and inorganic acid salt. The mineral admixtures are combined into different oxides, have different activities, surface effects, filling effects or pozzolana effects, and when the mineral admixtures are mixed into concrete, the slump, workability, cohesiveness, segregation resistance and later strength of the sprayed concrete can be improved, so that the concrete has better fluidity, compactness and uniformity, and the production requirement of the solid square pile is met.
Detailed Description
The present application will be described in further detail with reference to examples. It is to be understood that the specific embodiments described herein are merely illustrative of the relevant invention and not restrictive of the invention.
It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict. The present application will be described in detail with reference to examples.
The invention provides high-performance fly ash sprayed concrete for a mudstone tunnel, which comprises base concrete, fly ash, steel fiber and a mixed admixture.
The base concrete comprises 372 parts by mass of cement, 929 parts by mass of medium sand, 929 parts by mass of broken stone, 177 parts by mass of water, 4.13 parts by mass of a water reducing agent and 11.6-24.78 parts by mass of an alkali-free liquid accelerator.
The volume ratio of the steel fiber is 1-2%.
The mixed admixture comprises 25 parts by mass of fly ash, 10.5 parts by mass of slag powder and 5.5 parts by mass of gypsum.
Wherein, the chemical composition of the fly ash is required to be as the following table 1:
TABLE 1 chemical composition of fly ash
When the fly ash is used for replacing mineral admixtures in cement materials and concrete, the invention adopts I-grade ash, the fly ash with few particles, few sponge bodies and low carbon content can be maximally filled into cement particles and aggregate pores, the porosity of the concrete is reduced, and the filling effect is improved.
As a preferred embodiment, the fineness of the fly ash is less than 12, the water requirement of the fly ash is less than or equal to 95%, the loss on ignition of the fly ash is less than or equal to 1%, the water content of the fly ash is less than or equal to 1%, and the SO of the fly ash is 3 The content is less than or equal to 3 percent. The specific indexes are as follows: the fineness of fly ash (the screen residue of 45 mu m square-hole sieve is not more than%) is less than 12, the water requirement is not more than 95%, the ignition loss is not more than 5%, the water content is not more than 1%, and SO is 3 Not more than 3%.
The fly ash disclosed by the invention is few in particles, few in sponge and low in carbon content, so that the filling effect of the fly ash is increased, the water absorption capacity and the adsorption capacity are reduced, and the working performance is improved.
In the invention, the mixing amount of the fly ash is 6 percent. Test results show that the compressive strength of the sprayed concrete is highest in 1 day and 7 days when the mixing amount is 6%, and the highest compressive strength is 24.1 MPa.
According to the high-performance fly ash sprayed concrete for the mudstone tunnel, the fly ash volcanic ash activity effect is utilized, SiO and a cement hydration product CH are subjected to secondary reaction to generate C-S-H gel filling aggregate and cement slurry interface layer pores, so that the concrete interface structure is changed, the strength and the durability are improved, and meanwhile, the optimal mixing amount of the fly ash is adjusted to meet the optimal strength requirement.
The high-performance fly ash sprayed concrete for the mudstone tunnel disclosed by the invention has the advantages that the fly ash particles are filled into the pores of the cement particles and the aggregate to the maximum extent by utilizing the particle size difference among the fly ash, the cement particles and the aggregate, the porosity of the concrete is reduced, and the filling effect is improved.
In a preferred embodiment, the base concrete includes 24.78 parts by mass of an alkali-free liquid accelerator.
In a preferred embodiment, the steel fibers have a volume fraction of 2%. The length of the steel fiber is 20-40mm, and the diameter is 0.5 mm. The steel fiber must not have obvious rust, oil stain and other impurities which prevent the steel fiber from bonding with cement, and the total weight of the impurities such as adhesion sheets caused by poor processing, fibers with seriously rusted surfaces, iron rust powder and the like contained in the steel fiber should not exceed 1 percent of the weight of the steel fiber. Through the steel fiber tests of different volume ratios, the test aims at the steel fiber fly ash sprayed concrete with the volume ratios of 1%, 1.25%, 1.5%, 1.75% and 2%, and the test result shows that the tensile strength, the bending strength, the shearing strength and the compressive strength of the steel fiber fly ash sprayed concrete with the volume ratio of 2% are the highest, and the tests of four parameters are increased positively along with the increase of four volume ratios.
In a preferred embodiment, the water reducing agent is a polycarboxylic acid high-performance water reducing agent.
In a preferred embodiment, the cement is p.o42.5 portland cement.
The invention provides a preparation method of high-performance fly ash sprayed concrete for a mudstone tunnel, which comprises the following steps:
s1: respectively weighing basic concrete, fly ash, steel fiber and mixed admixture;
s2: uniformly mixing cement, medium sand, gravel, a water reducing agent and water in the basic concrete with a mixed admixture, and adding the steel fiber in the mixing process to obtain a mixed material;
s3: and before primary support of the mudstone surrounding rock jet construction tunnel, adding the alkali-free liquid accelerator of the basic concrete into the mixed material and uniformly stirring to prepare the high-performance fly ash jet concrete for the mudstone tunnel.
The high-performance fly ash sprayed concrete for the mudstone tunnel is sprayed on mudstone surrounding rocks by a wet spraying process of a spraying construction process to construct a primary tunnel support, and the spraying rebound rate of the concrete is low due to the adoption of high-quality cement.
The cement, coarse and fine aggregates, the water reducing agent, the mixed mineral admixture and the water are stirred firstly, the steel fibers are added in a dispersing way in the stirring process, the stirring time is determined by a field homogeneity test, and the stirring time is prolonged by 1-2 mim compared with the stirring time specified by common concrete. The accelerator was added during spraying, the shotcrete was forced through a wet sprayer to a spray head, and the compounded concrete was sprayed onto the mudstone tunnel and into the mold of the test.
The high-performance fly ash shotcrete for the mudstone tunnel is prepared by matching basic concrete components, steel fibers, additives (a water reducing agent and an accelerating agent) and a mixed admixture, so that the mechanical property and the filling effect of the concrete are greatly improved, the setting time is further shortened, the rebound rate is further reduced, the workability and the slump are increased, and the overall working performance of the shotcrete is improved.
The high-performance fly ash sprayed concrete for the mudstone tunnel has high mechanical property and is quickly condensed to solve the problems that rheological characteristics cause poor stability of surrounding rocks of the mudstone tunnel, the concrete condensation time needs to be shortened and the strength of the concrete needs to be enhanced, after steel fibers are added, the tensile strength, the bending strength, the shearing strength, the compressive strength and the compressive toughness are greatly improved, and the rebound rate is greatly reduced. The curing speed and the strength increasing speed of the high-performance fly ash sprayed concrete for the mudstone tunnel reduce the curing time of the concrete.
The mixed admixture of the high-performance fly ash sprayed concrete for the mudstone tunnel comprises a mixture at least containing oxides of Si, Al, Fe, Ca and S and inorganic acid salt. The mineral admixtures are combined into different oxides, have different activities, surface effects, filling effects or pozzolana effects, and when the mineral admixtures are mixed into concrete, the slump, workability, cohesiveness, segregation resistance and later strength of the sprayed concrete can be improved, so that the concrete has better fluidity, compactness and uniformity, and the production requirement of the solid square pile is met.
In order to clearly show the properties of the high-performance fly ash shotcrete for mudstone tunnel of the present invention, the following examples 1 to 20 are particularly mentioned, and are compared with comparative examples.
Specifically, the raw material mixing ratios of the concrete of examples 1 to 20, and the comparative example are shown in table 2 below.
TABLE 2 high-performance fly ash shotcrete mix ratio for mudstone tunnel
Table 2 shows the mixing ratio of the high-performance fly ash shotcrete for the mudstone tunnel
Examples 1 to 20, and comparative examples were prepared using the preparation method of the high performance fly ash shotcrete for mudstone tunnel of the present invention, respectively, and test measurement samples were left.
The mechanical property detection of the high-performance fly ash sprayed concrete for the mudstone tunnel is carried out according to the invention, namely, the performance detection reference standard GB/T50107-. Examples 1 to 20, and comparative examples the test measured the properties of the samples as shown in tables 3 and 4 below.
Table 3 working performance table for high performance fly ash shotcrete of mudstone tunnel
Table 3 working performance table for high-performance fly ash shotcrete in mudstone tunnel
TABLE 4 mechanical Properties of high-Performance fly ash shotcrete for mudstone tunnel
TABLE 4 table of mechanical properties of high-performance fly ash sprayed concrete for mudstone tunnel
As can be seen from tables 3 and 4, the working performance of the shotcrete produced by the method for preparing high-performance fly ash shotcrete for mudstone tunnel according to the present invention is greatly improved, mainly:
1. the strength of the fly ash sprayed concrete is improved, and the mechanical property is greatly improved;
2. the concrete setting time is shortened, so that a supporting system closed loop is quickly formed;
3. the filling effect of the sprayed concrete is improved; the concrete aggregate and the crushed and short columnar rock burst gaps are fully filled, and the aggregate particles are lubricated;
4. the cohesiveness, plasticity and workability of the sprayed concrete are improved;
5. the problem of too high rebound rate of the sprayed concrete is solved.
Besides, the invention carries out a plurality of experimental descriptions of the embodiment for clearly explaining the working performance of the concrete, and the experimental descriptions of the embodiment do not exist independently but are a whole set of technical scheme.
The above description is only a preferred embodiment of the application and is illustrative of the principles of the technology employed. It will be appreciated by a person skilled in the art that the scope of the invention as referred to in the present application is not limited to the embodiments with a specific combination of the above-mentioned features, but also covers other embodiments with any combination of the above-mentioned features or their equivalents without departing from the inventive concept. For example, the above features may be replaced with (but not limited to) features having similar functions disclosed in the present application.
Claims (6)
1. The high-performance fly ash sprayed concrete for the mudstone tunnel is characterized by comprising basic concrete, fly ash, steel fibers and a mixed admixture, wherein the basic concrete comprises 372 parts by mass of cement, 929 parts by mass of middlings, 929 parts by mass of broken stones, 177 parts by mass of water, 4.13 parts by mass of a water reducing agent and 11.6-24.78 parts by mass of an alkali-free liquid accelerator, the volume ratio of the steel fibers is 1-2%, and the mixed admixture comprises 25 parts by mass of fly ash, 10.5 parts by mass of slag powder and 5.5 parts by mass of gypsum.
2. The high-performance fly ash shotcrete for a mudstone tunnel according to claim 1, wherein the base concrete includes 24.78 parts by mass of an alkali-free liquid accelerator.
3. The high-performance fly ash shotcrete for mudstone tunnels as claimed in claim 1, wherein the volume fraction of the steel fibers is 2%.
4. The high-performance fly ash shotcrete for mudstone tunnel according to claim 1, wherein the fineness of the fly ash is less than 12, the water demand of the fly ash is less than or equal to 95%, the loss on ignition of the fly ash is less than or equal to 5%, the water content of the fly ash is less than or equal to 1%, and the SO of the fly ash is less than or equal to 1% 3 The content is less than or equal to 3 percent.
5. The high-performance fly ash shotcrete for a mudstone tunnel according to claim 1, wherein the water reducing agent is a polycarboxylic acid high-performance water reducing agent.
6. A preparation method of the high-performance fly ash shotcrete for the mudstone tunnel as claimed in any one of claims 1 to 5, comprising the following steps:
respectively weighing basic concrete, fly ash, steel fiber and mixed admixture;
uniformly mixing cement, medium sand, gravel, a water reducing agent and water in the basic concrete with a mixed admixture, and adding the steel fiber in the mixing process to obtain a mixed admixture;
before wet-spraying and spraying the primary support of the construction tunnel on the mudstone surrounding rock, adding the alkali-free liquid accelerator of the basic concrete into the mixed material and uniformly stirring to prepare the high-performance fly ash sprayed concrete for the mudstone tunnel.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202210193900.7A CN114956710A (en) | 2022-03-01 | 2022-03-01 | High-performance fly ash sprayed concrete for mudstone tunnel and preparation method thereof |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202210193900.7A CN114956710A (en) | 2022-03-01 | 2022-03-01 | High-performance fly ash sprayed concrete for mudstone tunnel and preparation method thereof |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116283145A (en) * | 2023-03-14 | 2023-06-23 | 西南交通大学 | High-strength and high-toughness heat-insulation functional sprayed concrete for high-temperature hot water tunnel |
| CN116354664A (en) * | 2023-03-07 | 2023-06-30 | 中南大学 | Composition for sprayed concrete, preparation method and application thereof |
| CN116425485A (en) * | 2023-04-17 | 2023-07-14 | 燕山大学 | Steel fiber cement-based spraying mortar and preparation method thereof |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103626444A (en) * | 2012-08-27 | 2014-03-12 | 沈保国 | Construction process of steel fiber shotcrete |
| CN113968714A (en) * | 2021-09-29 | 2022-01-25 | 宿州市健生矿山设备有限公司 | Aluminate cement-based spraying mortar and preparation method thereof |
-
2022
- 2022-03-01 CN CN202210193900.7A patent/CN114956710A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103626444A (en) * | 2012-08-27 | 2014-03-12 | 沈保国 | Construction process of steel fiber shotcrete |
| CN113968714A (en) * | 2021-09-29 | 2022-01-25 | 宿州市健生矿山设备有限公司 | Aluminate cement-based spraying mortar and preparation method thereof |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116354664A (en) * | 2023-03-07 | 2023-06-30 | 中南大学 | Composition for sprayed concrete, preparation method and application thereof |
| CN116283145A (en) * | 2023-03-14 | 2023-06-23 | 西南交通大学 | High-strength and high-toughness heat-insulation functional sprayed concrete for high-temperature hot water tunnel |
| CN116425485A (en) * | 2023-04-17 | 2023-07-14 | 燕山大学 | Steel fiber cement-based spraying mortar and preparation method thereof |
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