CN117263559A - Powdery alkali-free accelerator for sprayed concrete in alpine region and preparation method thereof - Google Patents
Powdery alkali-free accelerator for sprayed concrete in alpine region and preparation method thereof Download PDFInfo
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- CN117263559A CN117263559A CN202311191872.6A CN202311191872A CN117263559A CN 117263559 A CN117263559 A CN 117263559A CN 202311191872 A CN202311191872 A CN 202311191872A CN 117263559 A CN117263559 A CN 117263559A
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- 239000011378 shotcrete Substances 0.000 title claims abstract description 42
- 238000002360 preparation method Methods 0.000 title abstract description 6
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 26
- 230000015271 coagulation Effects 0.000 claims abstract description 23
- 238000005345 coagulation Methods 0.000 claims abstract description 23
- GDVKFRBCXAPAQJ-UHFFFAOYSA-A dialuminum;hexamagnesium;carbonate;hexadecahydroxide Chemical compound [OH-].[OH-].[OH-].[OH-].[OH-].[OH-].[OH-].[OH-].[OH-].[OH-].[OH-].[OH-].[OH-].[OH-].[OH-].[OH-].[Mg+2].[Mg+2].[Mg+2].[Mg+2].[Mg+2].[Mg+2].[Al+3].[Al+3].[O-]C([O-])=O GDVKFRBCXAPAQJ-UHFFFAOYSA-A 0.000 claims abstract description 22
- 229910001701 hydrotalcite Inorganic materials 0.000 claims abstract description 22
- 229960001545 hydrotalcite Drugs 0.000 claims abstract description 22
- 239000000378 calcium silicate Substances 0.000 claims abstract description 21
- 229910052918 calcium silicate Inorganic materials 0.000 claims abstract description 21
- OYACROKNLOSFPA-UHFFFAOYSA-N calcium;dioxido(oxo)silane Chemical compound [Ca+2].[O-][Si]([O-])=O OYACROKNLOSFPA-UHFFFAOYSA-N 0.000 claims abstract description 21
- DIZPMCHEQGEION-UHFFFAOYSA-H aluminium sulfate (anhydrous) Chemical compound [Al+3].[Al+3].[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O DIZPMCHEQGEION-UHFFFAOYSA-H 0.000 claims abstract description 20
- SNAAJJQQZSMGQD-UHFFFAOYSA-N aluminum magnesium Chemical compound [Mg].[Al] SNAAJJQQZSMGQD-UHFFFAOYSA-N 0.000 claims abstract description 20
- 238000010521 absorption reaction Methods 0.000 claims abstract description 14
- 239000002994 raw material Substances 0.000 claims abstract description 13
- 230000001737 promoting effect Effects 0.000 claims abstract description 7
- NLYAJNPCOHFWQQ-UHFFFAOYSA-N kaolin Chemical group O.O.O=[Al]O[Si](=O)O[Si](=O)O[Al]=O NLYAJNPCOHFWQQ-UHFFFAOYSA-N 0.000 claims description 10
- 238000000034 method Methods 0.000 claims description 10
- 229920003088 hydroxypropyl methyl cellulose Polymers 0.000 claims description 9
- INHCSSUBVCNVSK-UHFFFAOYSA-L lithium sulfate Inorganic materials [Li+].[Li+].[O-]S([O-])(=O)=O INHCSSUBVCNVSK-UHFFFAOYSA-L 0.000 claims description 8
- PUZPDOWCWNUUKD-UHFFFAOYSA-M sodium fluoride Chemical compound [F-].[Na+] PUZPDOWCWNUUKD-UHFFFAOYSA-M 0.000 claims description 8
- 239000001866 hydroxypropyl methyl cellulose Substances 0.000 claims description 7
- 235000010979 hydroxypropyl methyl cellulose Nutrition 0.000 claims description 7
- 239000011777 magnesium Substances 0.000 claims description 7
- RBTVSNLYYIMMKS-UHFFFAOYSA-N tert-butyl 3-aminoazetidine-1-carboxylate;hydrochloride Chemical group Cl.CC(C)(C)OC(=O)N1CC(N)C1 RBTVSNLYYIMMKS-UHFFFAOYSA-N 0.000 claims description 7
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical group [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 claims description 6
- CSNNHWWHGAXBCP-UHFFFAOYSA-L Magnesium sulfate Chemical compound [Mg+2].[O-][S+2]([O-])([O-])[O-] CSNNHWWHGAXBCP-UHFFFAOYSA-L 0.000 claims description 6
- 229910052749 magnesium Inorganic materials 0.000 claims description 6
- IRPGOXJVTQTAAN-UHFFFAOYSA-N 2,2,3,3,3-pentafluoropropanal Chemical compound FC(F)(F)C(F)(F)C=O IRPGOXJVTQTAAN-UHFFFAOYSA-N 0.000 claims description 5
- KLZUFWVZNOTSEM-UHFFFAOYSA-K Aluminum fluoride Inorganic materials F[Al](F)F KLZUFWVZNOTSEM-UHFFFAOYSA-K 0.000 claims description 5
- GUJOJGAPFQRJSV-UHFFFAOYSA-N dialuminum;dioxosilane;oxygen(2-);hydrate Chemical compound O.[O-2].[O-2].[O-2].[Al+3].[Al+3].O=[Si]=O.O=[Si]=O.O=[Si]=O.O=[Si]=O GUJOJGAPFQRJSV-UHFFFAOYSA-N 0.000 claims description 5
- ORUIBWPALBXDOA-UHFFFAOYSA-L magnesium fluoride Chemical compound [F-].[F-].[Mg+2] ORUIBWPALBXDOA-UHFFFAOYSA-L 0.000 claims description 5
- 229910001635 magnesium fluoride Inorganic materials 0.000 claims description 5
- 229920000609 methyl cellulose Polymers 0.000 claims description 5
- 239000001923 methylcellulose Substances 0.000 claims description 5
- 229910052901 montmorillonite Inorganic materials 0.000 claims description 5
- 239000005995 Aluminium silicate Substances 0.000 claims description 4
- 235000012211 aluminium silicate Nutrition 0.000 claims description 4
- 239000000440 bentonite Substances 0.000 claims description 4
- 229910000278 bentonite Inorganic materials 0.000 claims description 4
- SVPXDRXYRYOSEX-UHFFFAOYSA-N bentoquatam Chemical compound O.O=[Si]=O.O=[Al]O[Al]=O SVPXDRXYRYOSEX-UHFFFAOYSA-N 0.000 claims description 4
- 150000001875 compounds Chemical class 0.000 claims description 4
- 235000013024 sodium fluoride Nutrition 0.000 claims description 4
- 239000011775 sodium fluoride Substances 0.000 claims description 4
- 229910052723 transition metal Inorganic materials 0.000 claims description 4
- 150000003624 transition metals Chemical class 0.000 claims description 4
- ZXAUZSQITFJWPS-UHFFFAOYSA-J zirconium(4+);disulfate Chemical compound [Zr+4].[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O ZXAUZSQITFJWPS-UHFFFAOYSA-J 0.000 claims description 4
- 229910052943 magnesium sulfate Inorganic materials 0.000 claims description 3
- 235000019341 magnesium sulphate Nutrition 0.000 claims description 3
- 238000002156 mixing Methods 0.000 claims description 3
- 238000005303 weighing Methods 0.000 claims description 3
- 229910052731 fluorine Inorganic materials 0.000 claims description 2
- 239000011737 fluorine Substances 0.000 claims description 2
- 125000001153 fluoro group Chemical group F* 0.000 claims description 2
- 229960003943 hypromellose Drugs 0.000 claims description 2
- 230000000694 effects Effects 0.000 abstract description 19
- 239000004567 concrete Substances 0.000 abstract description 16
- 239000004568 cement Substances 0.000 abstract description 15
- 238000010276 construction Methods 0.000 abstract description 12
- 230000001133 acceleration Effects 0.000 abstract description 3
- 239000000654 additive Substances 0.000 abstract description 3
- 239000007921 spray Substances 0.000 abstract description 2
- 230000000052 comparative effect Effects 0.000 description 15
- 238000012360 testing method Methods 0.000 description 11
- 239000000843 powder Substances 0.000 description 9
- 239000000463 material Substances 0.000 description 8
- 239000011575 calcium Substances 0.000 description 4
- 238000006703 hydration reaction Methods 0.000 description 4
- UFVKGYZPFZQRLF-UHFFFAOYSA-N hydroxypropyl methyl cellulose Chemical compound OC1C(O)C(OC)OC(CO)C1OC1C(O)C(O)C(OC2C(C(O)C(OC3C(C(O)C(O)C(CO)O3)O)C(CO)O2)O)C(CO)O1 UFVKGYZPFZQRLF-UHFFFAOYSA-N 0.000 description 4
- 235000010981 methylcellulose Nutrition 0.000 description 4
- 230000008569 process Effects 0.000 description 4
- 229910001653 ettringite Inorganic materials 0.000 description 3
- 230000036571 hydration Effects 0.000 description 3
- 230000009467 reduction Effects 0.000 description 3
- 239000000126 substance Substances 0.000 description 3
- 229910001051 Magnalium Inorganic materials 0.000 description 2
- CQBLUJRVOKGWCF-UHFFFAOYSA-N [O].[AlH3] Chemical compound [O].[AlH3] CQBLUJRVOKGWCF-UHFFFAOYSA-N 0.000 description 2
- 230000002528 anti-freeze Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 2
- 239000011083 cement mortar Substances 0.000 description 2
- 230000008014 freezing Effects 0.000 description 2
- 238000007710 freezing Methods 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 239000007791 liquid phase Substances 0.000 description 2
- 230000006911 nucleation Effects 0.000 description 2
- 238000010899 nucleation Methods 0.000 description 2
- 239000000047 product Substances 0.000 description 2
- 239000002002 slurry Substances 0.000 description 2
- 238000003756 stirring Methods 0.000 description 2
- LNAZSHAWQACDHT-XIYTZBAFSA-N (2r,3r,4s,5r,6s)-4,5-dimethoxy-2-(methoxymethyl)-3-[(2s,3r,4s,5r,6r)-3,4,5-trimethoxy-6-(methoxymethyl)oxan-2-yl]oxy-6-[(2r,3r,4s,5r,6r)-4,5,6-trimethoxy-2-(methoxymethyl)oxan-3-yl]oxyoxane Chemical compound CO[C@@H]1[C@@H](OC)[C@H](OC)[C@@H](COC)O[C@H]1O[C@H]1[C@H](OC)[C@@H](OC)[C@H](O[C@H]2[C@@H]([C@@H](OC)[C@H](OC)O[C@@H]2COC)OC)O[C@@H]1COC LNAZSHAWQACDHT-XIYTZBAFSA-N 0.000 description 1
- YFVXLROHJBSEDW-UHFFFAOYSA-N 4-[(4-nitrophenyl)diazenyl]-n-phenylaniline Chemical compound C1=CC([N+](=O)[O-])=CC=C1N=NC(C=C1)=CC=C1NC1=CC=CC=C1 YFVXLROHJBSEDW-UHFFFAOYSA-N 0.000 description 1
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 description 1
- CPLXHLVBOLITMK-UHFFFAOYSA-N Magnesium oxide Chemical compound [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 description 1
- OBNDGIHQAIXEAO-UHFFFAOYSA-N [O].[Si] Chemical compound [O].[Si] OBNDGIHQAIXEAO-UHFFFAOYSA-N 0.000 description 1
- 230000000996 additive effect Effects 0.000 description 1
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 239000003513 alkali Substances 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 125000004429 atom Chemical group 0.000 description 1
- 229910052791 calcium Inorganic materials 0.000 description 1
- WUKWITHWXAAZEY-UHFFFAOYSA-L calcium difluoride Chemical compound [F-].[F-].[Ca+2] WUKWITHWXAAZEY-UHFFFAOYSA-L 0.000 description 1
- 229910001634 calcium fluoride Inorganic materials 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000003153 chemical reaction reagent Substances 0.000 description 1
- 239000013065 commercial product Substances 0.000 description 1
- 230000000536 complexating effect Effects 0.000 description 1
- 238000002425 crystallisation Methods 0.000 description 1
- 230000008025 crystallization Effects 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000011049 filling Methods 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 230000009746 freeze damage Effects 0.000 description 1
- 238000000227 grinding Methods 0.000 description 1
- 229910052602 gypsum Inorganic materials 0.000 description 1
- 239000010440 gypsum Substances 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 230000006698 induction Effects 0.000 description 1
- 238000009440 infrastructure construction Methods 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- WRUGWIBCXHJTDG-UHFFFAOYSA-L magnesium sulfate heptahydrate Chemical compound O.O.O.O.O.O.O.[Mg+2].[O-]S([O-])(=O)=O WRUGWIBCXHJTDG-UHFFFAOYSA-L 0.000 description 1
- 229940061634 magnesium sulfate heptahydrate Drugs 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 239000013080 microcrystalline material Substances 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 239000004570 mortar (masonry) Substances 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 238000005036 potential barrier Methods 0.000 description 1
- 239000003805 procoagulant Substances 0.000 description 1
- 239000011435 rock Substances 0.000 description 1
- 239000004576 sand Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 230000008961 swelling Effects 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
- 238000010257 thawing Methods 0.000 description 1
- 230000008719 thickening Effects 0.000 description 1
- 229910000385 transition metal sulfate Inorganic materials 0.000 description 1
- 238000001291 vacuum drying Methods 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
- C04B2103/00—Function or property of ingredients for mortars, concrete or artificial stone
- C04B2103/10—Accelerators; Activators
- C04B2103/12—Set accelerators
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
The invention provides a powdery alkali-free accelerator for sprayed concrete in alpine regions and a preparation method thereof, belonging to the technical field of concrete additives. The alkali-free accelerator comprises the following raw materials in parts by weight: 100-300 parts of magnesium aluminum hydrotalcite, 500-700 parts of aluminum sulfate, 50-100 parts of hydrated calcium silicate, 20-80 parts of early strength component, 1-3 parts of water retention component, 5-20 parts of coagulation promoting component and 50-200 parts of water absorption component. The powdery alkali-free accelerator has good early strength effect and excellent coagulation acceleration effect, can greatly improve the early strength of sprayed concrete while reducing the consumption of cement, simultaneously improves the sprayability of the sprayed concrete, reduces the rebound quantity of the concrete, saves the consumption of the concrete, meets the requirement of quick support, improves the support safety and accelerates the construction progress. In the alpine region, a high-speed railway tunnel the spray construction method has wide application prospect in the projects of water conservancy and hydropower and the like.
Description
Technical Field
The invention belongs to the technical field of concrete additives, and particularly relates to a powdery alkali-free accelerator for sprayed concrete in alpine regions and a preparation method thereof.
Background
The sprayed concrete plays an increasingly important role in infrastructure construction and urban construction engineering, and particularly, the demand in the process of high-speed railway, highway construction and tunnel construction is increased, and the demand is in a trend of increasing continuously, so that the performance of the sprayed concrete is required to be higher and higher. The accelerator is used as an indispensable additive for sprayed concrete, has the main functions of accelerating the setting and hardening of cement and reducing the rebound rate of the sprayed concrete, has been rapidly developed in recent years, and is particularly an alkali-free liquid accelerator.
In general, the following problems are common in the current accelerator products: (1) The alkali content exceeds the standard, so that the later strength assurance rate of the concrete is not high easily; (2) The problem of slow development of early-age strength influences the technical early support of the rock mass structure of tunnel and the like. While various accelerator products used at present can meet the requirements of rapid hardening, the early-age strength (6 h and 12 h) is very low, the rapid supporting requirements of some projects can not be met far, and the construction progress of tunnel construction is also influenced.
In addition, in the construction of sprayed concrete in high and cold areas, the sprayed concrete is in a low-pressure and low-temperature environment from stirring and transportation to construction, and is easily subjected to freeze injury, so that the rebound rate is increased, the workload is increased, and the quality of the concrete is difficult to ensure.
However, at present, for sprayed concrete in alpine regions, a specific scheme is not provided how to improve early strength and coagulation accelerating effect, improve sprayability of the sprayed concrete and reduce rebound quantity of the concrete.
Disclosure of Invention
In order to solve the technical problems, the invention provides a powdery alkali-free accelerator for sprayed concrete in alpine regions and a preparation method thereof.
The invention provides a powdery alkali-free accelerator for sprayed concrete in alpine regions, which comprises the following raw materials: magnesium aluminum hydrotalcite, aluminum sulfate, hydrated calcium silicate, an early strength component, a water retention component, a coagulation promoting component and a water absorption component;
the early strength component is a compound containing transition metal;
the accelerator component is a fluorine-containing compound.
Further, the material comprises the following raw materials in parts by weight: 100-300 parts of magnesium aluminum hydrotalcite, 500-700 parts of aluminum sulfate, 50-100 parts of hydrated calcium silicate, 20-80 parts of early strength component, 1-3 parts of water retention component, 5-20 parts of coagulation promoting component and 50-200 parts of water absorption component.
Further, the material comprises the following raw materials in parts by weight: 200-300 parts of magnesium aluminum hydrotalcite, 500-600 parts of aluminum sulfate, 50-70 parts of hydrated calcium silicate, 30-80 parts of early strength component, 1-3 parts of water retention component, 5-10 parts of coagulation accelerator component and 50-200 parts of water absorption component.
Further, the material comprises the following raw materials in parts by weight: 300 parts of magnesium aluminum hydrotalcite, 500 parts of aluminum sulfate, 50 parts of calcium silicate hydrate, 20 parts of early strength component, 1 part of water retention component, 5 parts of coagulation promoting component and 124 parts of water absorption component.
Further, the early strength component is lithium sulfate, zirconium sulfate or magnesium sulfate.
Further, the water-retaining component is hypromellose or methylcellulose.
Further, the accelerator component is magnesium fluosilicate, magnesium fluoride, aluminum fluoride or sodium fluoride.
Further, the water absorbing component is metakaolin, kaolin, bentonite or montmorillonite.
The invention also provides a preparation method of the powdery alkali-free accelerator for sprayed concrete in alpine regions, which comprises the following steps: and weighing the raw materials according to parts by weight, and uniformly mixing to obtain the powdery alkali-free accelerator for sprayed concrete in alpine regions.
According to the technical scheme, the raw materials interact, so that the problems of low early strength, poor coagulation accelerating effect and sprayability and large rebound quantity of concrete in the shotcrete in the alpine region are effectively solved: (1) Aluminum sulfate is an important factor affecting the performance of the accelerator, aluminum sulfate and Ca (OH) in the liquid phase 2 Reaction takes place, consuming Ca (OH) 2 Promote the formation of ettringite, overlap each other between the ettringite, form the netted skeleton structure, and the filling effect of C-S-H gel makes the structure more compact in addition, plays the effect of procoagulant and improvement intensity to cement. (2) Al (Al) 3+ 、Mg 2+ The invention has good accelerating effect on the accelerating coagulation of cement hydration, magnesium-aluminum hydrotalcite is added into the accelerator for the first time, the magnesium-aluminum hydrotalcite is an alkaline layered material with a certain degree, and the laminate is composed of magnesium-oxygen octahedron and aluminum-oxygen octahedron, thus being beneficial to the excellent nano-size effect and the unique layered structure of the accelerator, so that the accelerator has excellent coagulation accelerating effect. (3) The early strength component contains transition metal, the transition metal has a hollow d orbit and is easy to complex with other atoms, so that the early strength component has stronger complexing capacity, and the addition of transition metal sulfate can improve the pore structure of sprayed concrete, promote hydration reaction, improve the structural density in a matrix and be more beneficial to the development of later strength. (4) The water-retaining component mainly retains waterAnd the thickening effect can effectively improve the adhesive force of the slurry. (5) F in the setting accelerator component - With Ca in liquid phase 2+ Calcium fluoride is formed, CH nucleation crystallization is inhibited, meanwhile, the consumption of gypsum is promoted, the formation of ettringite is accelerated, and the coagulation accelerating effect is achieved. (6) The water absorbing component is in a lamellar structure and can combine free water in cement slurry in the water swelling dispersion process, so that the bonding effect of concrete is improved, in addition, the water absorbing component consists of a silicon oxygen tetrahedral layer and an aluminum oxygen octahedron, and can promote the biological generation of C-S-H gel and hydrated calcium sulfoaluminate to form a part of the strength basic substance of the cement concrete. (7) The powder hydrated calcium silicate plays a role in nucleus induction in the cement hydration process, reduces nucleation potential barriers, promotes early generation of C-S-H gel, ensures that the hydration of cement enters an acceleration period in advance, and improves the early strength of concrete.
Compared with the prior art, the invention has the following advantages and technical effects:
(1) The technical scheme of the invention has the advantages of simple process and no pollution to the environment, and the prepared alkali-free accelerator is powdery, so that the blank that the alkali-free accelerator used in alpine regions in the prior art can only be liquid and lacks powdery alkali-free accelerator is overcome.
(2) The powdery alkali-free accelerator has good early strength effect and excellent coagulation acceleration effect, can greatly improve the early strength of sprayed concrete while reducing the consumption of cement, simultaneously improves the sprayability of the sprayed concrete, reduces the rebound quantity of the concrete, saves the consumption of the concrete, meets the requirement of quick support, improves the support safety and accelerates the construction progress. In the alpine region, a high-speed railway tunnel the spray construction method has wide application prospect in the projects of water conservancy and hydropower and the like.
Detailed Description
Various exemplary embodiments of the invention will now be described in detail, which should not be considered as limiting the invention, but rather as more detailed descriptions of certain aspects, features and embodiments of the invention.
It is to be understood that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. In addition, for numerical ranges in this disclosure, it is understood that each intermediate value between the upper and lower limits of the ranges is also specifically disclosed. Every smaller range between any stated value or stated range, and any other stated value or intermediate value within the stated range, is also encompassed within the invention. The upper and lower limits of these smaller ranges may independently be included or excluded in the range.
Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. Although only preferred methods and materials are described herein, any methods and materials similar or equivalent to those described herein can be used in the practice or testing of the present invention. All documents mentioned in this specification are incorporated by reference for the purpose of disclosing and describing the methods and/or materials associated with the documents. In case of conflict with any incorporated document, the present specification will control.
It will be apparent to those skilled in the art that various modifications and variations can be made in the specific embodiments of the invention described herein without departing from the scope or spirit of the invention. Other embodiments will be apparent to those skilled in the art from consideration of the specification of the present invention. The specification and examples of the present invention are exemplary only.
As used herein, the terms "comprising," "including," "having," "containing," and the like are intended to be inclusive and mean an inclusion, but not limited to.
The raw materials used in the embodiment of the invention are all purchased from the market, wherein, the magnesium aluminum hydrotalcite is purchased from Shandong Usoxhlet chemical engineering Co., ltd, the aluminum sulfate is purchased from Zigbee win aluminum industry Co., ltd, the hydrated calcium silicate is a GK-3Z nano microcrystalline material which is a commercial product of Shijia Chang-An talent building material Co., ltd, the material is obtained by filtering, vacuum drying at 60 ℃, grinding, the anhydrous lithium sulfate in the early strength component is purchased from Guangdong river chemical reagent Co., the zirconium sulfate tetrahydrate is purchased from tin-free market hope chemical reagent Co., ltd, the magnesium sulfate heptahydrate is purchased from Fufang co-creation chemical Co., ltd, the hydroxypropyl methylcellulose and methyl cellulose in the water-retaining component are all purchased from Hebei jin Taida chemical industry Co., ltd, the magnesium fluosilicate in the coagulation accelerator component is purchased from Ji nan Xin Sen Yuan chemical industry Co., ltd, the magnesium fluoride is purchased from Tianjin Yuan chemical reagent Co., ltd, the aluminum fluoride is purchased from Tianjin optical complex technology development Co., ltd, the sodium fluoride is purchased from Tianjin Hongsha chemical reagent factory, and the metakaolin, the kaolin, the bentonite and the montmorillonite in the water-absorbing component are all purchased from Tianjin Euro chemical reagent Co., ltd.
The "parts" used in the examples of the present invention are "parts by weight" unless otherwise specified.
The technical scheme of the invention is further described by the following examples.
Example 1
200 parts of magnesium aluminum hydrotalcite, 600 parts of aluminum sulfate, 50 parts of powder calcium silicate hydrate, 30 parts of early strength component (lithium sulfate), 2 parts of water retention component (hydroxypropyl methylcellulose), 10 parts of coagulation accelerator component (magnesium fluosilicate) and 108 parts of water absorption component (metakaolin) are weighed according to parts by weight, and are stirred for 20 minutes and mixed uniformly to obtain the powdery alkali-free accelerator for sprayed concrete in alpine regions.
Example 2
100 parts of magnesium aluminum hydrotalcite, 600 parts of aluminum sulfate, 100 parts of powder hydrated calcium silicate, 40 parts of early strength component (zirconium sulfate), 1 part of water retention component (methyl cellulose), 5 parts of coagulation accelerator component (magnesium fluoride) and 154 parts of water absorption component (kaolin) are weighed according to parts by weight, and are stirred for 10 minutes and mixed uniformly to obtain the powdery alkali-free accelerator for sprayed concrete in alpine regions.
Example 3
Weighing 250 parts of magnesium aluminum hydrotalcite, 500 parts of aluminum sulfate, 50 parts of powder hydrated calcium silicate, 80 parts of early strength component (magnesium sulfate), 3 parts of water retention component (methyl cellulose), 20 parts of coagulation accelerator component (aluminum fluoride) and 97 parts of water absorption component (bentonite) according to parts by weight, and stirring for 30 minutes to obtain the powdery alkali-free accelerator for sprayed concrete in alpine regions.
Example 4
300 parts of magnesium aluminum hydrotalcite, 500 parts of aluminum sulfate, 50 parts of powder hydrated calcium silicate, 20 parts of early strength component (zirconium sulfate), 1 part of water retention component (hydroxypropyl methylcellulose), 5 parts of coagulation accelerator component (sodium fluoride) and 124 parts of water absorption component (montmorillonite) are weighed according to parts by weight, and stirred for 20 minutes and mixed uniformly to obtain the powdery alkali-free accelerator for sprayed concrete in alpine regions.
Example 5
100 parts of magnesium aluminum hydrotalcite, 700 parts of aluminum sulfate, 70 parts of powder hydrated calcium silicate, 20 parts of early strength component (lithium sulfate), 1 part of water retention component (methyl cellulose), 10 parts of coagulation accelerator component (magnesium fluoride) and 99 parts of water absorption component (montmorillonite) are weighed according to parts by weight, and stirred for 5 minutes and mixed uniformly to obtain the powdery alkali-free accelerator for sprayed concrete in alpine regions.
Comparative example 1
600 parts of aluminum sulfate, 50 parts of powder hydrated calcium silicate, 30 parts of lithium sulfate, 2 parts of hydroxypropyl methylcellulose, 10 parts of magnesium fluosilicate and 279 parts of metakaolin are weighed according to parts by weight, and are stirred for 20 minutes and uniformly mixed to obtain an accelerator comparison sample 1.
Comparative example 2
200 parts of magnesium aluminum hydrotalcite, 600 parts of aluminum sulfate, 30 parts of lithium sulfate, 2 parts of hydroxypropyl methylcellulose, 10 parts of magnesium fluosilicate and 158 parts of metakaolin are weighed according to parts by weight, and are stirred for 20 minutes and uniformly mixed to obtain an accelerator comparison sample 2.
Comparative example 3
250 parts of magnesium aluminum hydrotalcite, 650 parts of aluminum sulfate, 58 parts of powder hydrated calcium silicate, 30 parts of lithium sulfate, 2 parts of hydroxypropyl methylcellulose and 10 parts of aluminum fluoride are weighed according to parts by weight, and stirred for 20 minutes and uniformly mixed to obtain an accelerator comparison sample 3.
Performance testing
1. Setting time and compressive Strength
The setting accelerator prepared in examples 1-5 and comparative examples 1-3 was tested for setting time of cement paste and compressive strength of cement mortar according to the requirements of GB/T35159-2017 quick-setting accelerator for shotcrete, and the mixing amount was 3% of the cement amount.
Determination of setting time of cement paste: 400g of reference cement and 140g of water.
And (3) measuring the compressive strength of the cement mortar: 900g of standard cement, 1350g of standard sand and 450g of water.
The test results are shown in Table 1.
TABLE 1 setting time and compressive Strength test results of cements incorporating the example and comparative accelerators
The experimental results in Table 1 show that the powdery alkali-free accelerator for sprayed concrete in alpine regions prepared by the invention has better coagulation accelerating effect, obviously improves the 6-hour strength of mortar, is more than 1MPa, and has no collapse of later strength.
Example 1 compared with comparative example 1 shows that without the addition of magnalium hydrotalcite, the accelerating effect and early strength are significantly reduced.
Compared with comparative example 2, example 1 shows that the setting accelerating effect is not obviously reduced without adding powder hydrated calcium silicate CSH, and the early strength is poor.
Example 1 shows that the setting accelerator effect is poor without the addition of the water-absorbing component and the early strength is not significantly changed compared with comparative example 3.
2. Rebound testing
The accelerator prepared in each of examples 1 to 5 and comparative examples 1 to 3 was subjected to a rebound rate test according to the method mentioned in appendix G of JGJ/T372-2016, shotcrete application Specification, and the test results are shown in Table 2.
TABLE 2 test results of rebound Rate of accelerator
As can be seen from Table 2, the powdery alkali-free accelerator for sprayed concrete in alpine regions prepared by the invention can greatly reduce the rebound rate of the sprayed concrete, can greatly improve the construction site environment and saves the cost.
Example 1 shows that without the addition of magnalium hydrotalcite, lower early strength results in higher rebound.
Example 1 compared to comparative example 2 shows that without the addition of powdered calcium silicate hydrate CSH, lower early strength results in higher rebound.
The comparison of example 1 with comparative example 3 shows that the poor adhesion of the concrete results in a higher rebound rate without the addition of the water absorbing component.
3. Antifreeze property test
The quick freezing test was carried out on the accelerators prepared in examples 1 to 5 and comparative examples 1 to 3 according to the quick freezing method mentioned in GBJ82-85 test method for long-term Performance and durability of ordinary concrete, and the test results are shown in Table 3.
TABLE 3 antifreeze properties of concrete doped with different types of accelerators
From Table 3, the powdery alkali-free accelerator for sprayed concrete in alpine regions prepared by the invention has obviously improved freeze-thawing resistance.
Example 1 shows a reduction in freeze-thaw resistance without the addition of magnesium aluminum hydrotalcite as compared to comparative example 1.
Example 1 shows a reduction in freeze-thaw resistance compared to comparative example 2 without the addition of powdered calcium silicate hydrate CSH.
Example 1 shows a reduction in freeze-thaw resistance without the addition of a water absorbing component as compared to comparative example 3.
The foregoing is merely a preferred embodiment of the present application, but the scope of the present application is not limited thereto, and any changes or substitutions easily conceivable by those skilled in the art within the technical scope of the present application should be covered in the scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.
Claims (9)
1. The powdery alkali-free accelerator for sprayed concrete in alpine regions is characterized by comprising the following raw materials: magnesium aluminum hydrotalcite, aluminum sulfate, hydrated calcium silicate, an early strength component, a water retention component, a coagulation promoting component and a water absorption component;
the early strength component is a compound containing transition metal;
the accelerator component is a fluorine-containing compound.
2. The powdery alkali-free accelerator for sprayed concrete in alpine regions as claimed in claim 1, which is characterized by comprising the following raw materials in parts by weight: 100-300 parts of magnesium aluminum hydrotalcite, 500-700 parts of aluminum sulfate, 50-100 parts of hydrated calcium silicate, 20-80 parts of early strength component, 1-3 parts of water retention component, 5-20 parts of coagulation promoting component and 50-200 parts of water absorption component.
3. The powdery alkali-free accelerator for sprayed concrete in alpine regions as claimed in claim 2, which is characterized by comprising the following raw materials in parts by weight: 200-300 parts of magnesium aluminum hydrotalcite, 500-600 parts of aluminum sulfate, 50-70 parts of hydrated calcium silicate, 30-80 parts of early strength component, 1-3 parts of water retention component, 5-10 parts of coagulation accelerator component and 50-200 parts of water absorption component.
4. The powdery alkali-free accelerator for sprayed concrete in alpine regions according to claim 3, which is characterized by comprising the following raw materials in parts by weight: 300 parts of magnesium aluminum hydrotalcite, 500 parts of aluminum sulfate, 50 parts of calcium silicate hydrate, 20 parts of early strength component, 1 part of water retention component, 5 parts of coagulation promoting component and 124 parts of water absorption component.
5. The powdery alkali-free accelerator for shotcrete in alpine regions according to claim 1, wherein the early strength component is lithium sulfate, zirconium sulfate or magnesium sulfate.
6. The powdery alkali-free accelerator for shotcrete in alpine regions according to claim 1, wherein the water-retaining component is hypromellose or methylcellulose.
7. The alkali-free accelerator according to claim 1, wherein the accelerator is magnesium fluosilicate, magnesium fluoride, aluminum fluoride or sodium fluoride.
8. The powdery alkali-free accelerator for shotcrete in alpine regions according to claim 1, wherein the water absorbing component is metakaolin, kaolin, bentonite or montmorillonite.
9. A method for preparing the powdery alkali-free accelerator for shotcrete in alpine regions according to any one of claims 1 to 8, which is characterized by comprising the following steps: and weighing the raw materials according to parts by weight, and uniformly mixing to obtain the powdery alkali-free accelerator for sprayed concrete in alpine regions.
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