CN114804749A - Superfine modified silica micropowder low-resilience high-early-strength wet-spraying concrete and construction method thereof - Google Patents
Superfine modified silica micropowder low-resilience high-early-strength wet-spraying concrete and construction method thereof Download PDFInfo
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- CN114804749A CN114804749A CN202210461582.8A CN202210461582A CN114804749A CN 114804749 A CN114804749 A CN 114804749A CN 202210461582 A CN202210461582 A CN 202210461582A CN 114804749 A CN114804749 A CN 114804749A
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- 239000004567 concrete Substances 0.000 title claims abstract description 50
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical class O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 title claims abstract description 40
- 238000010276 construction Methods 0.000 title claims abstract description 21
- 238000005507 spraying Methods 0.000 title claims description 20
- 239000011378 shotcrete Substances 0.000 claims abstract description 32
- 239000000843 powder Substances 0.000 claims abstract description 18
- 239000004568 cement Substances 0.000 claims abstract description 9
- 239000003638 chemical reducing agent Substances 0.000 claims description 8
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 8
- 239000004576 sand Substances 0.000 claims description 7
- 239000007788 liquid Substances 0.000 claims description 6
- 239000000203 mixture Substances 0.000 claims description 6
- 239000002245 particle Substances 0.000 claims description 5
- 239000002994 raw material Substances 0.000 claims description 5
- 238000013329 compounding Methods 0.000 claims description 4
- 239000002253 acid Substances 0.000 claims description 3
- 238000012545 processing Methods 0.000 claims description 3
- 239000004575 stone Substances 0.000 claims description 3
- 229910004298 SiO 2 Inorganic materials 0.000 claims description 2
- 238000005422 blasting Methods 0.000 claims description 2
- 238000002347 injection Methods 0.000 claims description 2
- 239000007924 injection Substances 0.000 claims description 2
- 238000004519 manufacturing process Methods 0.000 claims description 2
- 238000005259 measurement Methods 0.000 claims description 2
- 239000007921 spray Substances 0.000 claims description 2
- 238000005303 weighing Methods 0.000 claims description 2
- 230000009286 beneficial effect Effects 0.000 abstract description 3
- 239000004566 building material Substances 0.000 abstract description 3
- 239000004574 high-performance concrete Substances 0.000 abstract description 2
- 238000012797 qualification Methods 0.000 abstract 1
- 239000000463 material Substances 0.000 description 9
- 238000000034 method Methods 0.000 description 6
- 230000008569 process Effects 0.000 description 5
- 150000003376 silicon Chemical class 0.000 description 5
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical class [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 4
- 239000003795 chemical substances by application Substances 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 238000012360 testing method Methods 0.000 description 4
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 3
- 239000011435 rock Substances 0.000 description 3
- 239000002699 waste material Substances 0.000 description 3
- 238000009412 basement excavation Methods 0.000 description 2
- 230000008901 benefit Effects 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 238000003912 environmental pollution Methods 0.000 description 2
- 239000010881 fly ash Substances 0.000 description 2
- 239000007789 gas Substances 0.000 description 2
- 238000006703 hydration reaction Methods 0.000 description 2
- 230000000979 retarding effect Effects 0.000 description 2
- 229910021487 silica fume Inorganic materials 0.000 description 2
- 229910000519 Ferrosilicon Inorganic materials 0.000 description 1
- 238000003723 Smelting Methods 0.000 description 1
- 230000006978 adaptation Effects 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 239000002956 ash Substances 0.000 description 1
- 239000006227 byproduct Substances 0.000 description 1
- AXCZMVOFGPJBDE-UHFFFAOYSA-L calcium dihydroxide Chemical compound [OH-].[OH-].[Ca+2] AXCZMVOFGPJBDE-UHFFFAOYSA-L 0.000 description 1
- 239000000920 calcium hydroxide Substances 0.000 description 1
- 229910001861 calcium hydroxide Inorganic materials 0.000 description 1
- 239000011083 cement mortar Substances 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000002708 enhancing effect Effects 0.000 description 1
- 230000003628 erosive effect Effects 0.000 description 1
- 239000003292 glue Substances 0.000 description 1
- 230000036571 hydration Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 239000002440 industrial waste Substances 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 239000002086 nanomaterial Substances 0.000 description 1
- 230000001590 oxidative effect Effects 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 239000010453 quartz Substances 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000012827 research and development Methods 0.000 description 1
- 239000000377 silicon dioxide Substances 0.000 description 1
- 239000002689 soil Substances 0.000 description 1
- 238000007619 statistical method Methods 0.000 description 1
- 239000011882 ultra-fine particle 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
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D11/00—Lining tunnels, galleries or other underground cavities, e.g. large underground chambers; Linings therefor; Making such linings in situ, e.g. by assembling
- E21D11/04—Lining with building materials
- E21D11/10—Lining with building materials with concrete cast in situ; Shuttering also lost shutterings, e.g. made of blocks, of metal plates or other equipment adapted therefor
- E21D11/105—Transport or application of concrete specially adapted for the lining of tunnels or galleries ; Backfilling the space between main building element and the surrounding rock, e.g. with concrete
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Structural Engineering (AREA)
- Architecture (AREA)
- Ceramic Engineering (AREA)
- Mining & Mineral Resources (AREA)
- Organic Chemistry (AREA)
- Inorganic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Civil Engineering (AREA)
- Materials Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Geology (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
- Lining And Supports For Tunnels (AREA)
Abstract
The utility model provides a superfine modified silica micropowder high early strength wet shotcrete of low resilience and construction method thereof, belongs to modified concrete construction technical field, can solve tunnel first grade wet shotcrete rebound rate height, and building material is extravagant in a large number, increases cost, polluted environment, causes the problem that tunnel first grade once qualification rate is low simultaneously, includes the component of following mass fraction: 408 parts of cement 405-. The superfine modified silica powder has good dispersibility in high-strength high-performance concrete, is beneficial to improving the early strength of the concrete, obtains a more compact concrete cementing surface and reduces the rebound rate.
Description
Technical Field
The invention belongs to the technical field of modified concrete construction, and particularly relates to a low-resilience high-early-strength wet-spraying concrete of superfine modified silica powder and a construction method thereof.
Background
With the vigorous development of the transportation industry in China, the construction extension scale of high-speed railways and highways is continuously enlarged, the construction projects in mountainous areas and heavy hilly areas are more and more, and the occupation ratio of tunnel projects is higher and higher. As is well known, in tunnel construction, wet-sprayed concrete is generally used as primary support after surrounding rock excavation. The wet sprayed concrete has the characteristics of convenient construction, stable performance, good uniformity, less pollution, friendliness to constructors and the like, so the wet sprayed concrete is widely applied. However, due to the influence of the construction process and the performance of the material, the stability control difficulty of the sprayed concrete is greatly influenced by the performance of the material, the rebound rate of the wet sprayed concrete is high in the actual construction process, and a part of the concrete sprayed on the rock surface falls off. According to the previous tunnel construction experience, the rebound rate of wet-sprayed concrete generally reaches 20% -30%, namely about one third of concrete becomes waste materials due to falling, so that not only are a great deal of waste, cost increase and environmental pollution caused by building materials and the like caused, but also the construction progress is greatly influenced, and the safety of tunnel excavation construction is also greatly influenced. Therefore, the rebound rate of the wet-sprayed concrete of the tunnel is reduced, the research and development of the wet-sprayed concrete with low rebound rate and high early strength are urgent, and the method has important significance for saving resources, reducing cost and ensuring the safety of engineering construction.
Disclosure of Invention
The invention provides a superfine modified silica micropowder low-resilience high-early-strength wet-spraying concrete which is prepared by developing a micron-nanometer powder active admixture-superfine modified silica micropowder instead of admixture fly ash in traditional concrete by adopting industrial wastes, aiming at the problems of high resilience rate of tunnel primary wet-spraying concrete, large waste of building materials, increased cost, environmental pollution and low primary qualified rate of tunnel primary.
The invention adopts the following technical scheme:
the superfine modified silica micropowder low-resilience high-early-strength wet-sprayed concrete comprises the following components in parts by mass: 408 parts of cement 405-.
Further, the particle size of the superfine modified silicon powder is 0.1-0.2 μm, and the specific surface area is 20000-25000 m 2 /kg，SiO 2 The content is more than or equal to 80 percent.
Further, the grain size of the machine-made sand is 0-5 mm;
further, the particle size of the crushed stone is 5-10 mm, and the crushed stone is continuously graded;
further, the water reducing agent is a polycarboxylic acid high-performance water reducing agent;
further, the accelerator is a liquid alkali-free accelerator.
A construction method of superfine modified silica micropowder low-resilience high-early-strength wet-spraying concrete comprises the following steps:
the concrete construction adopts wet blasting manipulator to go on, spouts the compounding and mixes the station production by the extracavern automatic measurement, utilizes concrete transportation tank car to transport to the injection site and adds the sprayer, will spout the compounding pump sending to shower nozzle department through the sprayer, mixes with the liquid accelerator of the full-automatic ratio of computer volume of mixing control, and reuse highly-compressed air sprays, specifically includes following step: raw material preparation → mix proportion selection → centralized processing of mixing station → transportation of concrete transport vehicle → wet spraying manipulator → nozzle → sprayed surface.
Firstly, preparing raw materials;
secondly, weighing raw materials according to a mixing ratio;
thirdly, intensively processing and mixing in a mixing station;
fourthly, transporting the concrete to a spraying place through a concrete transport vehicle;
and fifthly, spraying to the sprayed surface through a nozzle of the wet spraying mechanical arm.
Wherein, the concrete is sprayed on the soil stratum with large sand content, a layer of cement mortar is sprayed firstly, and then the concrete is sprayed according to the conventional method.
The superfine modified silicon powder is a by-product produced in smelting ferrosilicon alloy in arc furnace, and is produced through reducing quartz at 2000 deg.c into Si and SiO gas and oxidizing in cooling into SiO gas 2 The (mainly amorphous) ultrafine particles have extremely high activity. As a concrete admixture, the strength, frost resistance, impermeability and erosion resistance of the concrete can be greatly improved, the alkali-aggregate reaction is obviously inhibited, the hydration heat is reduced, and the early strength of the concrete can be improved (because the activity of the silica fume is extremely high, the silica fume can be subjected to hydration reaction with calcium hydroxide even in the early stage). Through the particle grading design, the rheological property of the tunnel wet-spraying concrete reaches the level of the nano-material modified wet-spraying concrete, and the wet-spraying concrete with low rebound rate and high early strength is prepared.
The effect of the superfine modified silica powder is far higher than that of fly ash, and the application amount of the silica ash is 5-15% of the cement amount; the concrete is used for high-strength, ultrahigh-strength and high-durability concrete. The superfine modified silica powder has good dispersibility in high-strength high-performance concrete, is beneficial to improving the early strength of the concrete, obtains a more compact concrete cementing surface and reduces the rebound rate. By adopting the superfine modified silica powder as a sample of the admixture, under the condition that 50kg of cementing material (cement) is reduced compared with the original mixing ratio, the 7d uniaxial compressive strength reaches 138 percent of the designed strength and is improved by 4.4MPa compared with the original mixing ratio; the rebound rate is reduced to 10 percent from the original 25 percent, and the cost is saved by 61.95 yuan/square. Therefore, the superfine modified silica powder is used as the concrete admixture, and has the characteristics of reducing the cement consumption and enhancing the concrete strength.
The invention has the following beneficial effects:
1. the superfine modified silicon powder and the alkali-free liquid accelerator have good adaptability
Another important factor influencing the rebound rate of the wet sprayed concrete is the matching between the accelerating agent and the cementing material, the improper selection of the accelerating agent or the improper adaptation of the accelerating agent to cement, admixture and the like can cause the concrete to be incapable of being effectively adhered to the surrounding rock.
2. The superfine modified silica micropowder modified wet-sprayed concrete has good early mechanical property and volume stability
The early mechanical property of wet-sprayed concrete determines whether the primary support is safe, and if the strength of the wet-sprayed concrete develops too slowly, the support risk is increased inevitably. The volume stability of the superfine modified silica powder modified wet-sprayed concrete has obvious influence on the safety, stability, permeability and the like of a supporting system, and the superfine modified silica powder modified wet-sprayed concrete has the advantages of high early strength, good later strength increase, good impermeability and strong durability.
3. Concrete mixture performance after adding superfine modified silicon powder
According to the characteristic of large specific surface area of the superfine modified silica powder, under the condition of ensuring that the workability and cohesiveness of concrete mixture meet the requirements of site operation, firstly, the sand rate is adjusted, the sand rate of common C25 sprayed concrete is about 55 percent, the sand rate is adjusted to 50 percent after the superfine modified silicon micro powder is added, the problems that the sprayed concrete is easy to be viscous, the slump loss is too fast, the local cracking phenomenon caused by uneven shrinkage in the hardening process is effectively solved, the resistance of a spraying pipe is too large due to the viscosity of the concrete in the spraying process, the sprayed concrete caused by pressure loss can not be dispersed and the atomized accelerating agent is fully and uniformly blended together, so that the problems of loosening and uncompacted sprayed concrete, block falling, slip and the like generated in the hardening and shrinking process are caused, and various performance indexes of the mixture of the concrete are effectively controlled to meet the technical requirements. The total amount of the optimized sprayed concrete glue material is reduced by 50kg compared with the original construction mix proportion. Per m 3 The concrete volume weight is adjusted to 2350-2380 kg.
4. The concrete added with the superfine modified silicon micro powder has good mechanical property
The average strength of the sprayed concrete (design strength C25) doped with the superfine modified silica powder is as follows: (1) in the indoor test, 13.2MPa in 1 day, 27.8MPa in 7 days and 37.6MPa in 28 days. (2) In the field large plate test, 11MPa in 1 day, 25.1MPa in 7 days and 34.2MPa in 28 days.
5. Economic benefit of superfine modified silicon micropowder modified wet-spraying concrete
Through the test of a plurality of test items, the average rebound rate is reduced from the original 22.2% to 10% by contrasting the statistical analysis of the data such as the strength and the rebound quantity of the sprayed concrete doped with the superfine modified silica powder and the common sprayed concrete, the single-component cost of the concrete is reduced by 51.6 yuan, and the cost reduction and the efficiency improvement effects are obvious.
Detailed Description
The superfine modified silica micropowder low-resilience high-early-strength wet-sprayed concrete comprises the following components in parts by mass: 408 parts of cement 405-.
Wherein the water reducing agent is a high-performance water reducing agent of ferrum RAWY101 polycarboxylic acid in Anhui province, a retarding water reducing agent of DYSH881-PF of Huayang new materials division of Luoyang constant-source tunnel materials Limited company, and a retarding water reducing agent of Shanxi Corter KTPCA.
The accelerator is an alkali-free accelerator made of iron (ZTF-02) liquid in Anhui province, a DYSH881-WJ type accelerator made by Huayang new materials division of Luoyang constant-source materials Limited, and an alkali-free accelerator made of Shanxi Corter KTWJS.
The mixing ratio of the original concrete and the superfine modified silicon micropowder-doped concrete is shown in table 1.
TABLE 1 comparison of original concrete mixing ratio and superfine modified silicon micropowder-doped concrete mixing ratio
The performance parameters of the three examples are shown in table 2 (the mixing amount of the superfine modified silica powder is the mass percentage of the superfine modified silica powder to the total mass of the superfine modified silica powder and the cement).
Table 2 performance parameters of examples of the invention
Claims (7)
1. The superfine modified silica micropowder low-resilience high-early-strength wet-sprayed concrete is characterized in that: the composition comprises the following components in parts by mass: 408 parts of cement 405-.
2. The ultra-fine modified silica micropowder low-resilience high-early-strength wet-sprayed concrete according to claim 1, characterized in that: the particle size of the superfine modified silicon micro powder is 0.1-0.2 mu m, and the specific surface area is 20000-25000 m 2 /kg，SiO 2 The content is more than or equal to 80 percent.
3. The ultra-fine modified silica micropowder low-resilience high-early-strength wet-sprayed concrete according to claim 1, characterized in that: the grain size of the sand is 0-5 mm machine-made sand.
4. The superfine modified silica micropowder low-resilience high-early-strength wet-sprayed concrete as claimed in claim 1, which is characterized in that: the particle size of the crushed stone is 5-10 mm.
5. The ultra-fine modified silica micropowder low-resilience high-early-strength wet-sprayed concrete according to claim 1, characterized in that: the water reducing agent is a polycarboxylic acid high-performance water reducing agent.
6. The ultra-fine modified silica micropowder low-resilience high-early-strength wet-sprayed concrete according to claim 1, characterized in that: the accelerator is a liquid alkali-free accelerator.
7. A construction method of superfine modified silica micropowder low-resilience high-early-strength wet-spraying concrete is characterized by comprising the following steps: the concrete construction adopts wet blasting manipulator to go on, spouts the compounding and mixes the station production by the extracavern automatic measurement, utilizes concrete transportation tank car to transport to the injection site and adds the sprayer, will spout the compounding pump sending to shower nozzle department through the sprayer, mixes with the liquid accelerator of the full-automatic ratio of computer volume of mixing control, and reuse highly-compressed air sprays, specifically includes following step:
firstly, preparing raw materials;
secondly, weighing raw materials according to a mixing ratio;
thirdly, intensively processing and mixing in a mixing station;
fourthly, transporting the concrete to a spraying place through a concrete transport vehicle;
and fifthly, spraying to the sprayed surface through a nozzle of the wet spraying mechanical arm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210461582.8A CN114804749A (en) | 2022-04-29 | 2022-04-29 | Superfine modified silica micropowder low-resilience high-early-strength wet-spraying concrete and construction method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210461582.8A CN114804749A (en) | 2022-04-29 | 2022-04-29 | Superfine modified silica micropowder low-resilience high-early-strength wet-spraying concrete and construction method thereof |
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| Publication Number | Publication Date |
|---|---|
| CN114804749A true CN114804749A (en) | 2022-07-29 |
Family
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| CN202210461582.8A Pending CN114804749A (en) | 2022-04-29 | 2022-04-29 | Superfine modified silica micropowder low-resilience high-early-strength wet-spraying concrete and construction method thereof |
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| CN (1) | CN114804749A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115417639A (en) * | 2022-08-30 | 2022-12-02 | 中国建筑土木建设有限公司 | Tunnel shotcrete and tunnel concrete shotcrete construction method |
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| JP2020011891A (en) * | 2018-07-06 | 2020-01-23 | 太平洋マテリアル株式会社 | High strength concrete for spraying |
| JP2020097515A (en) * | 2018-10-10 | 2020-06-25 | 江蘇聯瑞新材料股▲ふん▼有限公司 | Method for surface modification of submicron silicon fine powder |
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2022
- 2022-04-29 CN CN202210461582.8A patent/CN114804749A/en active Pending
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| CN108545975A (en) * | 2018-04-27 | 2018-09-18 | 成都东蓝星新材料有限公司 | A kind of modified SILICA FUME of gunite concrete |
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| JP2020097515A (en) * | 2018-10-10 | 2020-06-25 | 江蘇聯瑞新材料股▲ふん▼有限公司 | Method for surface modification of submicron silicon fine powder |
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Application publication date: 20220729 |
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