CN116425485A - Steel fiber cement-based spraying mortar and preparation method thereof - Google Patents
Steel fiber cement-based spraying mortar and preparation method thereof Download PDFInfo
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- CN116425485A CN116425485A CN202310409921.2A CN202310409921A CN116425485A CN 116425485 A CN116425485 A CN 116425485A CN 202310409921 A CN202310409921 A CN 202310409921A CN 116425485 A CN116425485 A CN 116425485A
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- 239000004570 mortar (masonry) Substances 0.000 title claims abstract description 60
- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 52
- 239000010959 steel Substances 0.000 title claims abstract description 52
- 239000000835 fiber Substances 0.000 title claims abstract description 49
- 239000004568 cement Substances 0.000 title claims abstract description 45
- 238000005507 spraying Methods 0.000 title abstract description 13
- 238000002360 preparation method Methods 0.000 title abstract description 9
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 43
- 239000010881 fly ash Substances 0.000 claims abstract description 26
- 239000003638 chemical reducing agent Substances 0.000 claims abstract description 24
- 239000004576 sand Substances 0.000 claims abstract description 15
- 239000002994 raw material Substances 0.000 claims abstract description 4
- 239000007921 spray Substances 0.000 claims description 16
- 239000000463 material Substances 0.000 claims description 15
- 239000000203 mixture Substances 0.000 claims description 14
- 239000011398 Portland cement Substances 0.000 claims description 7
- 238000000034 method Methods 0.000 claims description 7
- 239000007787 solid Substances 0.000 claims description 7
- 239000002253 acid Substances 0.000 claims description 3
- 239000011518 fibre cement Substances 0.000 claims 2
- 239000011159 matrix material Substances 0.000 abstract description 6
- 238000005336 cracking Methods 0.000 abstract description 4
- 239000011148 porous material Substances 0.000 abstract description 3
- 206010003549 asthenia Diseases 0.000 abstract description 2
- 238000012360 testing method Methods 0.000 description 6
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 4
- 230000000052 comparative effect Effects 0.000 description 4
- 239000004567 concrete Substances 0.000 description 4
- 239000003469 silicate cement Substances 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 230000003014 reinforcing effect Effects 0.000 description 3
- 238000009412 basement excavation Methods 0.000 description 2
- 239000004566 building material Substances 0.000 description 2
- 230000015271 coagulation Effects 0.000 description 2
- 238000005345 coagulation Methods 0.000 description 2
- 238000010276 construction Methods 0.000 description 2
- 238000002347 injection Methods 0.000 description 2
- 239000007924 injection Substances 0.000 description 2
- 229910052742 iron Inorganic materials 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 239000011378 shotcrete Substances 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- 229910001294 Reinforcing steel Inorganic materials 0.000 description 1
- 230000006978 adaptation Effects 0.000 description 1
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 239000011083 cement mortar Substances 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000006731 degradation reaction Methods 0.000 description 1
- 238000010348 incorporation Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 229920005646 polycarboxylate Polymers 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 239000011435 rock Substances 0.000 description 1
Images
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
- 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
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Inorganic Chemistry (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
The invention belongs to the technical field of spraying mortar, and discloses steel fiber cement-based spraying mortar and a preparation method thereof, wherein the steel fiber cement-based spraying mortar comprises the following raw materials in parts by weight: 1 portion of cement, 2.1 to 2.4 portions of sand, 0.45 to 0.55 portion of water, 0.1 to 0.2 portion of steel fiber, 0.4 to 0.5 portion of fly ash, 0.08 to 0.12 portion of accelerator and 0.015 to 0.02 portion of water reducer. The invention effectively improves the pore structure of the cement matrix, ensures that the internal structure is more compact, reduces the occurrence of shrinkage cracking, and simultaneously improves the later strength of mortar so as to reduce the strength loss of the matrix caused by the accelerator.
Description
Technical Field
The invention relates to the technical field of spraying mortar, in particular to steel fiber cement-based spraying mortar and a preparation method thereof.
Background
In the construction processes of railway and highway tunnel excavation, foundation pit excavation and the like, a reinforcing mesh and sprayed mortar (sprayed concrete) are commonly used for rapidly reinforcing surrounding rock mass. However, in the conventional reinforcing mesh and sprayed mortar (sprayed concrete) supporting structure, cracks appear due to self shrinkage and the influence of external environment, and the existence of the cracks can cause degradation of cement-based materials and corrosion of internal reinforcing steel bars, so that adverse effects are brought to durability and use safety of the structure, and engineering accidents are extremely easy to cause. In addition, although the early strength of the matrix can be increased rapidly by adding the accelerator, the later strength can only reach about 80% of the peak strength, and the later strength loss is large.
Therefore, the research results in a steel fiber cement-based spraying mortar and a preparation method thereof, so that the internal structure of the spraying mortar is more compact and has important significance.
Disclosure of Invention
In view of the above, the invention provides a steel fiber cement-based spraying mortar and a preparation method thereof, and aims to improve the toughness of the spraying mortar so as to solve the problems of easy cracking of the mortar due to shrinkage, low later strength and the like.
In order to achieve the above purpose, the invention adopts the following technical scheme:
the invention provides steel fiber cement-based spraying mortar, which comprises the following raw materials in parts by weight: 1 portion of cement, 2.1 to 2.4 portions of sand, 0.45 to 0.55 portion of water, 0.1 to 0.2 portion of steel fiber, 0.4 to 0.5 portion of fly ash, 0.08 to 0.12 portion of accelerator and 0.015 to 0.02 portion of water reducer.
Preferably, the cement is Portland cement.
Preferably, the grain diameter of the sand is less than or equal to 4.75mm, the fineness modulus is 2.4-2.8, and the mud content is less than or equal to 1%.
Preferably, the length of the steel fiber is 10-15 mm, and the diameter is 0.1-0.3 mm.
Preferably, the fly ash is class I fly ash.
Preferably, the initial setting time of the accelerator is less than or equal to 5min, the final setting time is less than or equal to 12min, and the solid content is 35-45%.
Preferably, the water reducer is a polycarboxylic acid water reducer, and the water reducing rate of the water reducer is more than or equal to 15%.
The invention also provides a preparation method of the steel fiber cement-based jet mortar, which comprises the following steps:
1) Cement and fly ash are mixed to prepare a cementing material;
2) Mixing the cementing material, sand, water, a water reducing agent and steel fibers to prepare a mortar mixture;
3) And adding an accelerator into the mortar mixture to prepare the steel fiber cement-based spray mortar. Compared with the prior art, the invention has the following beneficial effects:
(1) The invention can effectively improve the pore structure of the cement matrix after adding the fly ash, so that the internal structure is more compact, the phenomenon of shrinkage cracking is reduced, and the later strength of mortar is improved at the same time, thereby reducing the strength loss of the matrix caused by the accelerator.
(2) According to the invention, through the incorporation of the fine steel fibers, the pore structure of the cement matrix is further optimized, the bridging effect is achieved among the fine aggregates, the adhesive force between the mortar and the sprayed surface is also increased, and the sprayability of the mortar is improved.
(3) The invention has low preparation cost, simple method, high feasibility, stable performance, convenient transportation and storage and large-scale popularization and application.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are required to be used in the embodiments or the description of the prior art will be briefly described below, and it is obvious that the drawings in the following description are only embodiments of the present invention, and that other drawings can be obtained according to the provided drawings without inventive effort for a person skilled in the art.
FIG. 1 is a steel fiber cement-based spray mortar test piece (after the fracture resistance test) prepared in example 3 of the present invention.
Detailed Description
The invention provides steel fiber cement-based spraying mortar, which comprises the following raw materials in parts by weight: 1 portion of cement, 2.1 to 2.4 portions of sand, 0.45 to 0.55 portion of water, 0.1 to 0.2 portion of steel fiber, 0.4 to 0.5 portion of fly ash, 0.08 to 0.12 portion of accelerator and 0.015 to 0.02 portion of water reducer.
In the steel fiber cement-based jet mortar of the present invention, the sand is preferably 2.2 to 2.3 parts, more preferably 2.25 to 2.28 parts; the water is preferably 0.46 to 0.52 part, more preferably 0.48 to 0.5 part; the steel fiber is preferably 0.12 to 0.18 part, more preferably 0.14 to 0.16 part; the fly ash is preferably 0.42 to 0.48 part, more preferably 0.44 to 0.46 part; the accelerator is preferably 0.09 to 0.11 part, more preferably 0.092 to 0.1 part; the water reducing agent is preferably 0.016 to 0.019 parts, more preferably 0.017 to 0.018 parts.
In the invention, the cement is preferably Portland cement, and the quality standard of the cement accords with 42.5-grade cement in Table 5 of national Standard GB 175-2020 general Portland Cement.
In the present invention, the grain diameter of the sand is preferably not more than 4.75mm, more preferably 1.2 to 4.5mm, still more preferably 1.5 to 3.5mm, the fineness modulus is preferably 2.4 to 2.8, still more preferably 2.5 to 2.7, still more preferably 2.55 to 2.6, the mud content is preferably not more than 1%, still more preferably 0.2 to 0.8%, still more preferably 0.4 to 0.6%.
In the present invention, the length of the steel fiber is preferably 10 to 15mm, more preferably 11 to 14mm, still more preferably 12 to 13mm, and the diameter is preferably 0.1 to 0.3mm, still more preferably 0.15 to 0.25mm, still more preferably 0.18 to 0.22mm.
In the invention, the steel fiber meets the B-grade steel fiber in the table 4 of the national standard GB/T39147-2020 steel fiber for concrete.
In the invention, the fly ash is preferably the class I fly ash in Table 1 which accords with the national standard GB/T1596-2017 fly ash for cement and concrete.
In the invention, the fly ash is preferably first-grade fly ash produced from Qin Royal power plant with density of 2.6g/cm 3 。
In the present invention, the initial setting time of the accelerator is preferably not more than 5 minutes, more preferably 1 to 4 minutes, more preferably 2 to 3 minutes, and the final setting time is preferably not more than 12 minutes, more preferably 2 to 10 minutes, more preferably 4 to 6 minutes, and the solid content is preferably 35 to 45%, more preferably 38 to 42%, more preferably 40 to 41%.
In the invention, the accelerator is preferably a liquid alkali-free accelerator which accords with the national standard GB/T35159-2017 for spray coagulation in table 2, the accelerator is produced by Shanxi iron building materials Limited company, and the mixing amount of the accelerator is preferably 2.5%.
In the present invention, the water reducing agent is preferably a polycarboxylic acid type water reducing agent TL-AH-1, the water reducing rate of the water reducing agent is preferably 15% or more, more preferably 17% or more, still more preferably 22% or more, and the mixing amount of the water reducing agent is preferably 0.4%.
The invention also provides a preparation method of the steel fiber cement-based jet mortar, which comprises the following steps:
1) Cement and fly ash are mixed to prepare a cementing material;
2) Mixing the cementing material, sand, water, a water reducing agent and steel fibers to prepare a mortar mixture;
3) And adding an accelerator into the mortar mixture to prepare the steel fiber cement-based spray mortar.
The technical solutions provided by the present invention are described in detail below with reference to examples, but they should not be construed as limiting the scope of the present invention.
In the examples and the comparative examples, the Portland cement is 42.5 grade cement, and the quality of the Portland cement accords with Table 5 in the national standard GB 175-2020 general Portland Cement; the fly ash is the I-grade fly ash of Qin Royal island power plant, the quality of the fly ash accords with the table 1 of the national standard GB/T1596-2017 fly ash used in cement and concrete, and the density is 2.6g/cm 3 The method comprises the steps of carrying out a first treatment on the surface of the The steel fiber is B-grade steel fiber, and the quality of the steel fiber accords with the table 4 in the national standard GB/T39147-2020 steel fiber for concrete; the water reducer is a polycarboxylate water reducer TL-AH-1; the accelerator is a liquid alkali-free accelerator, and the quality of the accelerator accords with the table 2 in the national standard GB/T35159-2017 for accelerating the injection coagulation, and is produced by Shanxi iron building materials Limited company.
Example 1
Uniformly mixing 1 part of silicate cement with 0.45 part of fly ash to prepare a cementing material; the cementing material, 2.1 parts of sand (with the grain diameter of 4.5mm, the fineness modulus of 2.4, the mud content of 0.5%), 0.55 parts of water, 0.02 parts of water reducing agent (with the water reducing rate of 16%), and 0.12 parts of steel fiber (with the length of 12mm and the diameter of 0.2 mm) are mixed to prepare a mortar mixture; and adding 0.1 part of accelerator (initial setting time is 4min, final setting time is 11min and solid content is 36%) into the mortar mixture, and uniformly mixing to prepare the steel fiber cement-based spray mortar.
Example 2
Uniformly mixing 1 part of silicate cement with 0.42 part of fly ash to prepare a cementing material; the cementing material, 2.15 parts of sand (with the grain diameter of 4.4mm, the fineness modulus of 2.6, the mud content of 0.8 percent), 0.5 part of water, 0.016 part of water reducer (with the water reducing rate of 18 percent) and 0.15 part of steel fiber (with the length of 13mm and the diameter of 0.16 mm) are mixed to prepare a mortar mixture; and adding 0.08 part of accelerator (initial setting time is 5min, final setting time is 10min and solid content is 37%) into the mortar mixture, and uniformly mixing to prepare the steel fiber cement-based jet mortar.
Example 3
Uniformly mixing 1 part of silicate cement with 0.45 part of fly ash to prepare a cementing material; the cementing material, 2.2 parts of sand (particle size of 3.8mm, fineness modulus of 2.7, mud content of 0.3%), 0.45 parts of water, 0.018 parts of water reducer (water reducing rate of 17%), and 0.18 parts of steel fiber (length of 14mm, diameter of 0.23 mm) are mixed to prepare a mortar mixture; 0.12 part of accelerator (initial setting time is 3min, final setting time is 12min, and solid content is 35%) is added into the mortar mixture to prepare the steel fiber cement-based spray mortar.
Comparative example 1
Uniformly mixing 1 part of silicate cement with 0.45 part of fly ash to prepare a cementing material; the cementing material, 2.1 parts of sand (with the grain diameter of 4.5mm, the fineness modulus of 2.4 and the mud content of 0.5 percent), 0.55 part of water and 0.02 part of water reducing agent (with the water reducing rate of 16 percent) are mixed to prepare a mortar mixture; and adding 0.1 part of accelerator (initial setting time is 4min, final setting time is 11min and solid content is 16%) into the mortar mixture, and uniformly mixing to prepare the cement-based spray mortar.
The compressive strength and flexural strength of the spray mortars of examples 1 to 3 and comparative example 1 were tested with reference to the national standard GB/T17671-2021 method for testing Cement mortar strength (ISO method), and the shrinkage of 1d was tested with reference to the industry standard JGJ/T70-2009 method for testing basic Performance of construction mortar, the test results of which are shown in Table 1.
Table 1 results of the tests of the performance indexes related to the mortar injection of examples 1 to 3 and comparative example 1
As can be seen from the comparison of the data in the table 1, the compressive strength and the flexural strength of the mortar are improved along with the increase of the doping amount of the steel fiber and the decrease of the water-gel ratio; the data of the shrinkage rate of 1d also show that the shrinkage performance of the mortar can be improved by doping the steel fibers, and the cracking resistance and toughness improvement effects are achieved. Therefore, the content of the steel fibers can effectively improve the flexural compression strength of the sprayed mortar and improve the shrinkage performance of the mortar.
The foregoing is merely a preferred embodiment of the present invention and it should be noted that modifications and adaptations to those skilled in the art may be made without departing from the principles of the present invention, which are intended to be comprehended within the scope of the present invention.
Claims (8)
1. The steel fiber cement-based jet mortar is characterized by comprising the following raw materials in parts by weight: 1 portion of cement, 2.1 to 2.4 portions of sand, 0.45 to 0.55 portion of water, 0.1 to 0.2 portion of steel fiber, 0.4 to 0.5 portion of fly ash, 0.08 to 0.12 portion of accelerator and 0.015 to 0.02 portion of water reducer.
2. The steel fiber cement-based spray mortar of claim 1, wherein the cement is portland cement.
3. The steel fiber cement-based spray mortar according to claim 1, wherein the grain diameter of the sand is less than or equal to 4.75mm, the fineness modulus is 2.4-2.8, and the mud content is less than or equal to 1%.
4. A steel fibre cement-based spray mortar according to claim 3, wherein the steel fibres have a length of 10-15 mm and a diameter of 0.1-0.3 mm.
5. A steel fibre cement-based spray mortar according to any of claims 1 to 4, wherein said fly ash is class i fly ash.
6. The steel fiber cement-based spray mortar according to claim 5, wherein the initial setting time of the accelerator is less than or equal to 5min, the final setting time is less than or equal to 12min, and the solid content is 35-45%.
7. The steel fiber cement-based spray mortar according to claim 1 or 6, wherein the water reducing agent is a polycarboxylic acid type water reducing agent, and the water reducing rate of the water reducing agent is 15% or more.
8. The method for preparing steel fiber cement-based spray mortar according to any one of claims 1 to 7, comprising the steps of:
1) Cement and fly ash are mixed to prepare a cementing material;
2) Mixing the cementing material, sand, water, a water reducing agent and steel fibers to prepare a mortar mixture;
3) And adding an accelerator into the mortar mixture to prepare the steel fiber cement-based spray mortar.
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| CN202310409921.2A CN116425485A (en) | 2023-04-17 | 2023-04-17 | Steel fiber cement-based spraying mortar and preparation method thereof |
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| CN202310409921.2A CN116425485A (en) | 2023-04-17 | 2023-04-17 | Steel fiber cement-based spraying mortar and preparation method thereof |
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|---|---|---|---|---|
| CN103626444A (en) * | 2012-08-27 | 2014-03-12 | 沈保国 | Construction process of steel fiber shotcrete |
| CN107324719A (en) * | 2017-07-07 | 2017-11-07 | 鞍钢集团矿业有限公司 | The CS40 steel fiber shotcretes that a kind of utilization iron tailings sand is prepared |
| CN108046712A (en) * | 2018-01-15 | 2018-05-18 | 中国建筑科学研究院 | High-strength low-resilience-rate sprayed concrete and construction process thereof |
| CN112919864A (en) * | 2021-03-08 | 2021-06-08 | 中交武汉港湾工程设计研究院有限公司 | Recycled aggregate fiber reinforced shotcrete and preparation method thereof |
| 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 |
| CN114956710A (en) * | 2022-03-01 | 2022-08-30 | 中建八局检测科技有限公司 | High-performance fly ash sprayed concrete for mudstone tunnel and preparation method thereof |
-
2023
- 2023-04-17 CN CN202310409921.2A patent/CN116425485A/en active Pending
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| 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 |
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| 段绪胜等: "《土木工程概论》", 西北工业大学出版社, pages: 42 * |
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