CN116903335A - Early-strength quick-setting sprayed concrete material and processing technology thereof - Google Patents
Early-strength quick-setting sprayed concrete material and processing technology thereof Download PDFInfo
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- CN116903335A CN116903335A CN202310917520.8A CN202310917520A CN116903335A CN 116903335 A CN116903335 A CN 116903335A CN 202310917520 A CN202310917520 A CN 202310917520A CN 116903335 A CN116903335 A CN 116903335A
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- 239000011378 shotcrete Substances 0.000 title claims abstract description 45
- 239000000463 material Substances 0.000 title claims abstract description 42
- 238000005516 engineering process Methods 0.000 title claims abstract description 14
- 238000012545 processing Methods 0.000 title claims abstract description 13
- 239000000839 emulsion Substances 0.000 claims abstract description 110
- 229920001661 Chitosan Polymers 0.000 claims abstract description 74
- 239000000178 monomer Substances 0.000 claims abstract description 67
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 59
- 239000000843 powder Substances 0.000 claims abstract description 48
- 238000002156 mixing Methods 0.000 claims abstract description 39
- 239000006185 dispersion Substances 0.000 claims abstract description 36
- 239000003638 chemical reducing agent Substances 0.000 claims abstract description 23
- 239000004568 cement Substances 0.000 claims abstract description 22
- XFTALRAZSCGSKN-UHFFFAOYSA-M sodium;4-ethenylbenzenesulfonate Chemical compound [Na+].[O-]S(=O)(=O)C1=CC=C(C=C)C=C1 XFTALRAZSCGSKN-UHFFFAOYSA-M 0.000 claims abstract description 22
- 125000002057 carboxymethyl group Chemical group [H]OC(=O)C([H])([H])[*] 0.000 claims abstract description 21
- 150000003242 quaternary ammonium salts Chemical class 0.000 claims abstract description 20
- 239000002245 particle Substances 0.000 claims abstract description 10
- 239000003999 initiator Substances 0.000 claims description 36
- 239000011258 core-shell material Substances 0.000 claims description 29
- CSNNHWWHGAXBCP-UHFFFAOYSA-L Magnesium sulfate Chemical compound [Mg+2].[O-][S+2]([O-])([O-])[O-] CSNNHWWHGAXBCP-UHFFFAOYSA-L 0.000 claims description 26
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 claims description 26
- LXEKPEMOWBOYRF-UHFFFAOYSA-N [2-[(1-azaniumyl-1-imino-2-methylpropan-2-yl)diazenyl]-2-methylpropanimidoyl]azanium;dichloride Chemical compound Cl.Cl.NC(=N)C(C)(C)N=NC(C)(C)C(N)=N LXEKPEMOWBOYRF-UHFFFAOYSA-N 0.000 claims description 20
- 238000003756 stirring Methods 0.000 claims description 19
- 239000004698 Polyethylene Substances 0.000 claims description 16
- 239000000835 fiber Substances 0.000 claims description 16
- -1 polyethylene Polymers 0.000 claims description 16
- 229920000573 polyethylene Polymers 0.000 claims description 16
- 239000004575 stone Substances 0.000 claims description 16
- 238000000034 method Methods 0.000 claims description 15
- 239000004576 sand Substances 0.000 claims description 15
- 229920005646 polycarboxylate Polymers 0.000 claims description 14
- AEQDJSLRWYMAQI-UHFFFAOYSA-N 2,3,9,10-tetramethoxy-6,8,13,13a-tetrahydro-5H-isoquinolino[2,1-b]isoquinoline Chemical compound C1CN2CC(C(=C(OC)C=C3)OC)=C3CC2C2=C1C=C(OC)C(OC)=C2 AEQDJSLRWYMAQI-UHFFFAOYSA-N 0.000 claims description 13
- HRPVXLWXLXDGHG-UHFFFAOYSA-N Acrylamide Chemical compound NC(=O)C=C HRPVXLWXLXDGHG-UHFFFAOYSA-N 0.000 claims description 13
- JIGUQPWFLRLWPJ-UHFFFAOYSA-N Ethyl acrylate Chemical compound CCOC(=O)C=C JIGUQPWFLRLWPJ-UHFFFAOYSA-N 0.000 claims description 13
- VVQNEPGJFQJSBK-UHFFFAOYSA-N Methyl methacrylate Chemical compound COC(=O)C(C)=C VVQNEPGJFQJSBK-UHFFFAOYSA-N 0.000 claims description 13
- PMZURENOXWZQFD-UHFFFAOYSA-L Sodium Sulfate Chemical compound [Na+].[Na+].[O-]S([O-])(=O)=O PMZURENOXWZQFD-UHFFFAOYSA-L 0.000 claims description 13
- CQEYYJKEWSMYFG-UHFFFAOYSA-N butyl acrylate Chemical compound CCCCOC(=O)C=C CQEYYJKEWSMYFG-UHFFFAOYSA-N 0.000 claims description 13
- 229910052500 inorganic mineral Inorganic materials 0.000 claims description 13
- 229910052943 magnesium sulfate Inorganic materials 0.000 claims description 13
- 235000019341 magnesium sulphate Nutrition 0.000 claims description 13
- 235000010755 mineral Nutrition 0.000 claims description 13
- 239000011707 mineral Substances 0.000 claims description 13
- PNJWIWWMYCMZRO-UHFFFAOYSA-N pent‐4‐en‐2‐one Natural products CC(=O)CC=C PNJWIWWMYCMZRO-UHFFFAOYSA-N 0.000 claims description 13
- 239000011780 sodium chloride Substances 0.000 claims description 13
- 239000000176 sodium gluconate Substances 0.000 claims description 13
- 235000012207 sodium gluconate Nutrition 0.000 claims description 13
- 229940005574 sodium gluconate Drugs 0.000 claims description 13
- 229910052938 sodium sulfate Inorganic materials 0.000 claims description 13
- 235000011152 sodium sulphate Nutrition 0.000 claims description 13
- 238000001816 cooling Methods 0.000 claims description 12
- 238000007599 discharging Methods 0.000 claims description 12
- 238000001914 filtration Methods 0.000 claims description 12
- 239000007788 liquid Substances 0.000 claims description 12
- 230000008569 process Effects 0.000 claims description 12
- 238000001694 spray drying Methods 0.000 claims description 11
- 238000006243 chemical reaction Methods 0.000 claims description 10
- 230000001804 emulsifying effect Effects 0.000 claims description 10
- 238000010438 heat treatment Methods 0.000 claims description 10
- 238000002360 preparation method Methods 0.000 claims description 4
- DCNHVBSAFCNMBK-UHFFFAOYSA-N naphthalene-1-sulfonic acid;hydrate Chemical compound O.C1=CC=C2C(S(=O)(=O)O)=CC=CC2=C1 DCNHVBSAFCNMBK-UHFFFAOYSA-N 0.000 claims description 2
- 238000004321 preservation Methods 0.000 claims description 2
- 239000004567 concrete Substances 0.000 abstract description 14
- 230000000694 effects Effects 0.000 abstract description 4
- 238000006116 polymerization reaction Methods 0.000 abstract description 4
- 239000011248 coating agent Substances 0.000 abstract description 2
- 238000000576 coating method Methods 0.000 abstract description 2
- 239000011148 porous material Substances 0.000 abstract description 2
- 230000002195 synergetic effect Effects 0.000 abstract description 2
- 125000002091 cationic group Chemical group 0.000 abstract 1
- 230000000052 comparative effect Effects 0.000 description 8
- 238000012360 testing method Methods 0.000 description 4
- 230000004048 modification Effects 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- 230000009471 action Effects 0.000 description 2
- 239000004566 building material Substances 0.000 description 2
- 230000003111 delayed effect Effects 0.000 description 2
- 230000036571 hydration Effects 0.000 description 2
- 238000006703 hydration reaction Methods 0.000 description 2
- 239000004973 liquid crystal related substance Substances 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- 125000003277 amino group Chemical group 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000003093 cationic surfactant Substances 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- 238000001179 sorption measurement Methods 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 125000000542 sulfonic acid group Chemical group 0.000 description 1
- 239000004094 surface-active agent Substances 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
- 230000008719 thickening Effects 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
- 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
- C04B40/0046—Premixtures of ingredients characterised by their processing, e.g. sequence of mixing the ingredients when preparing the premixtures
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08F251/00—Macromolecular compounds obtained by polymerising monomers on to polysaccharides or derivatives thereof
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08F285/00—Macromolecular compounds obtained by polymerising monomers on to preformed graft polymers
-
- 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
- C04B2201/05—Materials having an early high strength, e.g. allowing fast demoulding or formless casting
-
- 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)
- Organic Chemistry (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Structural Engineering (AREA)
- Materials Engineering (AREA)
- Health & Medical Sciences (AREA)
- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
- Inorganic Chemistry (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
- Preparation Of Clay, And Manufacture Of Mixtures Containing Clay Or Cement (AREA)
- Graft Or Block Polymers (AREA)
Abstract
The invention relates to the technical field of concrete, in particular to an early-strength quick-setting sprayed concrete material and a processing technology thereof. According to the invention, different chitosan derivatives are used for respectively modifying the shell and core emulsion; the core emulsion is prepared by mixing cationic chitosan quaternary ammonium salt with soft monomer; sodium p-vinylbenzene sulfonate is selected as a hard monomer in the shell emulsion, and carboxymethyl chitosan is added; the chitosan derivative can improve the stability of emulsion and can also perform polymerization reaction with monomers; the sodium p-vinylbenzene sulfonate in the shell emulsion has electronegativity, and can generate electrostatic effect with chitosan quaternary ammonium salt with positive charges in the core emulsion, so that uniform coating is realized. The chitosan modified renewable dispersion emulsion powder is used for preparing sprayed concrete, so that a synergistic effect can be generated with a water reducing agent, the dispersion of cement particles can be promoted, the interconnection between the cement particles can be caused, the pore structure of a concrete interface can be improved, the mechanical property and the impermeability can be improved, and the slump can be reduced.
Description
Technical Field
The invention relates to the technical field of concrete, in particular to an early-strength quick-setting sprayed concrete material and a processing technology thereof.
Background
The sprayed concrete is the concrete which is sprayed at high speed and compacted instantaneously by the air-filled hose or pipeline under the pressure of high-pressure air and is commonly used for lining thin-wall structures such as tunnel linings, walls, ceilings and the like or lining of other structures and protecting layers of steel structures. Compared with common concrete, the sprayed concrete has the advantages of simple operation, economy, convenience, high structural compactness, good impermeability, flexibility and the like in the construction process, and has stronger applicability, so the sprayed concrete is widely applied to the fields of civil engineering, roads and bridges and the like.
In the practical use process of the sprayed concrete, the problems of reduced strength, poor durability and the like at the later stage occur, and the service performance is influenced, so that a novel sprayed concrete material is very necessary to be invented, and the short plates in the prior art are overcome.
Disclosure of Invention
The invention aims to provide an early-strength quick-setting sprayed concrete material and a processing technology thereof, so as to solve the problems in the background technology.
In order to solve the technical problems, the invention provides the following technical scheme: an early-strength quick-setting sprayed concrete material and a processing technology thereof, comprising the following steps:
step 1:
s11: mixing butyl acrylate, ethyl acrylate and water uniformly to obtain a mixed monomer A for later use;
s12: mixing the mixed monomer A, chitosan quaternary ammonium salt and sodium chloride, and mixing and reacting the mixed monomer A, the chitosan quaternary ammonium salt and the sodium chloride with a V-50 initiator to obtain a nuclear emulsion;
step 2:
s21: mixing and stirring carboxymethyl chitosan and sodium p-vinylbenzene sulfonate for reaction, and adding methyl methacrylate and acrylamide to obtain a mixed monomer B;
s22: adding the S21 mixed monomer B into the core emulsion of S12, adding a V-50 initiator, carrying out heat preservation reaction, naturally cooling, filtering and discharging to obtain core-shell emulsion;
s23: mixing the core-shell emulsion, PVA-205 and water to obtain a dispersion liquid, and spray-drying to obtain chitosan modified renewable dispersion emulsion powder;
step 3:
mixing the crushed stone, sand, cement, polyethylene fiber, chitosan modified renewable dispersed emulsion powder, water, mineral powder, sodium sulfate, magnesium sulfate, sodium gluconate and water reducer to obtain the sprayed concrete material.
Further, in S11, the content of each component in the mixed monomer A is 40-44 parts by weight of butyl acrylate, 10-16 parts by weight of ethyl acrylate and 40-50 parts by weight of water.
Further, in S12, the specific preparation method of the core emulsion is: mixing 8-10 parts of mixed monomer A, 2-4 parts of chitosan quaternary ammonium salt and 0.1-0.3 part of sodium chloride, rapidly stirring and emulsifying for 20-30 min, and heating to 75-85 ℃; adding 0.1-0.2 part of V-50 initiator, reacting for 0.5-1 h, then dripping the rest mixed monomer A and 0.1-0.15 part of V-50 initiator for 1-2 h, and reacting for 0.5-1 h after dripping, thus obtaining nuclear emulsion;
further, in S21, the content of each component in the mixed monomer B is 1-2 parts by weight of carboxymethyl chitosan, 25-32 parts by weight of sodium p-vinylbenzene sulfonate, 3-4 parts by weight of methyl methacrylate and 3-5 parts by weight of acrylamide.
Further, in S22, the preparation method of the core-shell emulsion includes: adding the S21 mixed monomer B into the nuclear emulsion of S12, adding a V-50 initiator, and reacting for 0.5h at 80-85 ℃ in a heat-preserving way; and naturally cooling, filtering and discharging to obtain the core-shell emulsion.
Further, in S23, the content of each component in the dispersion liquid is 20-30 parts by weight of core-shell emulsion, 3-5 parts by weight of PVA-205 and 5-7 parts by weight of water.
Further, in the step 3, the sprayed concrete material comprises, by weight, 30-33 parts of broken stone, 34-38 parts of sand, 15-18 parts of cement, 0.5-1 part of polyethylene fiber, 0.5-1.2 parts of chitosan modified renewable dispersed emulsion powder, 7-10 parts of water, 0.3-0.8 part of mineral powder, 0.1-0.3 part of sodium sulfate, 0.1-0.2 part of magnesium sulfate, 0.1-0.15 part of sodium gluconate and 0.2-0.3 part of polycarboxylate water reducer.
Further, in the step 3, the water reducing agent is any one of a polycarboxylate water reducing agent or a naphthalene sulfonate water reducing agent.
Further, in the step 3, the length of the polyethylene fiber is 8-12 mm; the particle size of the crushed stone is 5-10 mm.
Compared with the prior art, the invention has the following beneficial effects: the chitosan modified renewable dispersion emulsion powder prepared from the core-shell emulsion is added into the sprayed mixed concrete. In preparing the core-shell emulsion, different chitosan derivatives are added into the shell emulsion and the core emulsion for modification. In the core emulsion, chitosan quaternary ammonium salt is selected to be mixed with soft monomers of butyl acrylate and ethyl acrylate, and the chitosan quaternary ammonium salt has similar properties to a cationic surfactant, so that the stability of the emulsion can be improved, and the emulsion can participate in polymerization under the action of an initiator; when the shell emulsion is prepared, sodium p-vinylbenzene sulfonate, methyl methacrylate and acrylamide are selected as monomers, and simultaneously carboxymethyl chitosan is added, so that the carboxymethyl chitosan also has the function of a surfactant, and the stability of the emulsion can be improved; in addition, the amino group of carboxymethyl chitosan can also react with the sulfonic acid group of sodium p-vinylbenzene sulfonate, and can carry out polymerization reaction with other monomers in the shell emulsion under the action of an initiator. Because the core emulsion contains chitosan quaternary ammonium salt with positive charges and the sodium p-vinylbenzene sulfonate in the shell emulsion has electronegativity, electrostatic adsorption effect exists between the chitosan quaternary ammonium salt and the sodium p-vinylbenzene sulfonate, and thus the coating effect can be improved, and stable shell-core emulsion is formed.
And (3) carrying out spray drying on the core-shell emulsion to obtain chitosan modified renewable dispersion emulsion powder, wherein in the actual use process, the chitosan modified renewable dispersion emulsion powder is decomposed after being contacted with water, so as to release emulsion particles. Wherein, the chitosan quaternary ammonium salt and the carboxymethyl chitosan have thickening effect, and the carboxymethyl chitosan and the sodium p-vinylbenzene sulfonate can be adsorbed on positively charged cement particles, so that on one hand, the synergistic effect is generated with the water reducing agent, the dispersion of the cement particles is promoted together, and the working performance of the concrete is improved; on the other hand, the mutual connection among cement particles is caused by polymerization, so that the pore structure of a concrete interface is improved, the mechanical property and the impermeability are improved, and the slump is reduced. It should be noted that, since excessive sodium p-vinylbenzene sulfonate and carboxymethyl chitosan may cause delayed hydration of cement particles and affect early strength, it is necessary to control the amount of the shell emulsion to be not more than 40% of the amount of the core emulsion when preparing the shell-core emulsion. The 3h strength of the concrete material prepared by the method reaches 2MPa, and the 28d strength reaches 40MPa.
Detailed Description
The following description of the technical solutions in the embodiments of the present invention will be clear and complete, and it is obvious that the described embodiments are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
The materials used in the invention and the sources thereof: the chitosan quaternary ammonium salt is from source leaf organisms, and the product number is S26618; carboxymethyl chitosan is from a source foliar organism, cat No. S30948; the crushed stone is from An Xin, and the grain diameter is 5-8 mm; the sand is from Sichuan green mineral products, grade II medium sand; cement is from Qian Xinfeng building materials, PO42.5 grade cement; polyethylene fibers are from Kuraray company and have a length of 9-10 mm; PVA-205 is from Kuraray corporation under the designation PVA2050588; the mineral powder is from a hair building material, and the model S95; the polycarboxylate water reducer is from iridae chemical industry, and the content of the polycarboxylate water reducer is more than or equal to 99 percent.
Example 1: a processing technology of early-strength quick-setting sprayed concrete material comprises the following steps:
step 1:
s11: 42kg of butyl acrylate, 15kg of ethyl acrylate and 43kg of water are mixed and stirred uniformly to obtain a mixed monomer A for standby;
s12: mixing 10kg of mixed monomer A, 3.5kg of chitosan quaternary ammonium salt and 0.28kg of sodium chloride, and rapidly stirring and emulsifying for 20min; heating to 75 ℃ and adding 0.1-kgV-50 initiator, dropwise adding the rest mixed monomer A and 0.1-kgV-50 initiator after reacting for 0.5h, wherein the dropwise adding time is 1h, and preserving heat for reacting for 0.5h after dropwise adding to obtain a nuclear emulsion;
step 2:
s21: mixing and stirring 1.2kg of carboxymethyl chitosan and 30kg of sodium p-vinylbenzene sulfonate for reaction for 0.5h, and adding 3kg of methyl methacrylate and 4.8kg of acrylamide to obtain a mixed monomer B;
s22: adding the mixed monomer B in the S21 into the nuclear emulsion of the S12, adding 0.3-kgV-50 initiator, and reacting at 80 ℃ for 0.5h in a heat-preserving way; naturally cooling, filtering and discharging to obtain core-shell emulsion;
s23: mixing 20kg of core-shell emulsion, 3.5kg of PVA-205 and 6.3kg of water to obtain a dispersion liquid, and spray-drying to obtain chitosan modified renewable dispersion emulsion powder;
step 3:
30kg of crushed stone, 34kg of sand, 18kg of cement, 1kg of polyethylene fiber, 1kg of chitosan modified renewable dispersible emulsion powder, 8.6kg of water, 0.5kg of mineral powder, 0.14kg of sodium sulfate, 0.2kg of magnesium sulfate, 0.15kg of sodium gluconate and 0.3kg of polycarboxylate water reducer are mixed to obtain the sprayed concrete material.
Example 2: a processing technology of early-strength quick-setting sprayed concrete material comprises the following steps:
step 1:
s11: 42kg of butyl acrylate, 15kg of ethyl acrylate and 43kg of water are mixed and stirred uniformly to obtain a mixed monomer A for standby;
s12: mixing 10kg of mixed monomer A, 3.5kg of chitosan quaternary ammonium salt and 0.28kg of sodium chloride, and rapidly stirring and emulsifying for 25min; heating to 75 ℃ and adding 0.1-kgV-50 initiator, dropwise adding the rest mixed monomer A and 0.12-kgV-50 initiator after reacting for 0.5h, wherein the dropwise adding time is 1h, and preserving heat for reacting for 0.5h after dropwise adding to obtain a nuclear emulsion;
step 2:
s21: mixing and stirring 1.2kg of carboxymethyl chitosan and 30kg of sodium p-vinylbenzene sulfonate for reaction for 0.75h, and adding 3kg of methyl methacrylate and 4.8kg of acrylamide to obtain a mixed monomer B;
s22: adding the mixed monomer B in the S21 into the nuclear emulsion of the S12, adding 0.3-kgV-50 initiator, and reacting at 80 ℃ for 1h in a heat-preserving way; naturally cooling, filtering and discharging to obtain core-shell emulsion;
s23: mixing 20kg of core-shell emulsion, 3.5kg of PVA-205 and 6.3kg of water to obtain a dispersion liquid, and spray-drying to obtain chitosan modified renewable dispersion emulsion powder;
step 3:
30kg of crushed stone, 34kg of sand, 18kg of cement, 1kg of polyethylene fiber, 1kg of chitosan modified renewable dispersible emulsion powder, 8.6kg of water, 0.5kg of mineral powder, 0.14kg of sodium sulfate, 0.2kg of magnesium sulfate, 0.15kg of sodium gluconate and 0.3kg of polycarboxylate water reducer are mixed to obtain the sprayed concrete material.
Example 3: a processing technology of early-strength quick-setting sprayed concrete material comprises the following steps:
step 1:
s11: 42kg of butyl acrylate, 15kg of ethyl acrylate and 43kg of water are mixed and stirred uniformly to obtain a mixed monomer A for standby;
s12: mixing 10kg of mixed monomer A, 3.5kg of chitosan quaternary ammonium salt and 0.28kg of sodium chloride, and rapidly stirring and emulsifying for 25min; heating to 75 ℃ and adding 0.14-kgV-50 initiator, dropwise adding the rest mixed monomer A and 0.13-kgV-50 initiator after reacting for 0.8h, wherein the dropwise adding time is 1.5h, and preserving heat for reacting for 0.5h after dropwise adding to obtain nuclear emulsion;
step 2:
s21: mixing and stirring 1.2kg of carboxymethyl chitosan and 30kg of sodium p-vinylbenzene sulfonate for reaction for 0.5h, and adding 3kg of methyl methacrylate and 4.8kg of acrylamide to obtain a mixed monomer B;
s22: adding the mixed monomer B in the S21 into the nuclear emulsion of the S12, adding 0.3-kgV-50 initiator, and reacting for 0.5h at 82 ℃ in a heat-preserving way; naturally cooling, filtering and discharging to obtain core-shell emulsion;
s23: mixing 20kg of core-shell emulsion, 3.5kg of PVA-205 and 6.3kg of water to obtain a dispersion liquid, and spray-drying to obtain chitosan modified renewable dispersion emulsion powder;
step 3:
30kg of crushed stone, 34kg of sand, 18kg of cement, 1kg of polyethylene fiber, 1kg of chitosan modified renewable dispersible emulsion powder, 8.6kg of water, 0.5kg of mineral powder, 0.14kg of sodium sulfate, 0.2kg of magnesium sulfate, 0.15kg of sodium gluconate and 0.3kg of polycarboxylate water reducer are mixed to obtain the sprayed concrete material.
Example 4: a processing technology of early-strength quick-setting sprayed concrete material comprises the following steps:
step 1:
s11: 42kg of butyl acrylate, 15kg of ethyl acrylate and 43kg of water are mixed and stirred uniformly to obtain a mixed monomer A for standby;
s12: mixing 10kg of mixed monomer A, 3.5kg of chitosan quaternary ammonium salt and 0.28kg of sodium chloride, and rapidly stirring and emulsifying for 26min; heating to 80 ℃ and adding 0.17-kgV-50 initiator, dropwise adding the rest mixed monomer A and 0.13-kgV-50 initiator after reacting for 0.75h, wherein the dropwise adding time is 1.5h, and preserving heat for reacting for 1h after dropwise adding to obtain nuclear emulsion;
step 2:
s21: mixing and stirring 1.2kg of carboxymethyl chitosan and 30kg of sodium p-vinylbenzene sulfonate for reaction for 1h, and adding 3kg of methyl methacrylate and 4.8kg of acrylamide to obtain a mixed monomer B;
s22: adding the mixed monomer B in the S21 into the nuclear emulsion of the S12, adding 0.3-kgV-50 initiator, and reacting at the temperature of 81 ℃ for 0.8h; naturally cooling, filtering and discharging to obtain core-shell emulsion;
s23: mixing 20kg of core-shell emulsion, 3.5kg of PVA-205 and 6.3kg of water to obtain a dispersion liquid, and spray-drying to obtain chitosan modified renewable dispersion emulsion powder;
step 3:
30kg of crushed stone, 34kg of sand, 18kg of cement, 1kg of polyethylene fiber, 1kg of chitosan modified renewable dispersible emulsion powder, 8.6kg of water, 0.5kg of mineral powder, 0.14kg of sodium sulfate, 0.2kg of magnesium sulfate, 0.15kg of sodium gluconate and 0.3kg of polycarboxylate water reducer are mixed to obtain the sprayed concrete material.
Example 5: a processing technology of early-strength quick-setting sprayed concrete material comprises the following steps:
step 1:
s11: 42kg of butyl acrylate, 15kg of ethyl acrylate and 43kg of water are mixed and stirred uniformly to obtain a mixed monomer A for standby;
s12: mixing 10kg of mixed monomer A, 3.5kg of chitosan quaternary ammonium salt and 0.28kg of sodium chloride, and rapidly stirring and emulsifying for 23min; heating to 85 ℃ and adding 0.2-kgV-50 initiator, dropwise adding the rest mixed monomer A and 0.11-kgV-50 initiator after reacting for 0.5h, dropwise adding for 1.5h, and preserving heat for reacting for 0.9h after dropwise adding to obtain nuclear emulsion;
step 2:
s21: mixing and stirring 1.2kg of carboxymethyl chitosan and 30kg of sodium p-vinylbenzene sulfonate for reaction for 0.5h, and adding 3kg of methyl methacrylate and 4.8kg of acrylamide to obtain a mixed monomer B;
s22: adding the mixed monomer B in the S21 into the nuclear emulsion of the S12, adding 0.3-kgV-50 initiator, and reacting for 0.75h at 84 ℃ in a heat-preserving way; naturally cooling, filtering and discharging to obtain core-shell emulsion;
s23: mixing 20kg of core-shell emulsion, 3.5kg of PVA-205 and 6.3kg of water to obtain a dispersion liquid, and spray-drying to obtain chitosan modified renewable dispersion emulsion powder;
step 3:
30kg of crushed stone, 34kg of sand, 18kg of cement, 1kg of polyethylene fiber, 1kg of chitosan modified renewable dispersible emulsion powder, 8.6kg of water, 0.5kg of mineral powder, 0.14kg of sodium sulfate, 0.2kg of magnesium sulfate, 0.15kg of sodium gluconate and 0.3kg of polycarboxylate water reducer are mixed to obtain the sprayed concrete material.
Example 6: a processing technology of early-strength quick-setting sprayed concrete material comprises the following steps:
step 1:
s11: 42kg of butyl acrylate, 15kg of ethyl acrylate and 43kg of water are mixed and stirred uniformly to obtain a mixed monomer A for standby;
s12: mixing 10kg of mixed monomer A, 3.5kg of chitosan quaternary ammonium salt and 0.28kg of sodium chloride, and rapidly stirring and emulsifying for 23min; heating to 78 ℃ and adding 0.17-kgV-50 initiator, dropwise adding the rest mixed monomer A and 0.14-kgV-50 initiator after reacting for 0.75h, dropwise adding for 1.8h, and preserving heat for reacting for 0.85h after dropwise adding to obtain nuclear emulsion;
step 2:
s21: mixing and stirring 1.2kg of carboxymethyl chitosan and 30kg of sodium p-vinylbenzene sulfonate for reaction for 1h, and adding 3kg of methyl methacrylate and 4.8kg of acrylamide to obtain a mixed monomer B;
s22: adding the mixed monomer B in the S21 into the nuclear emulsion of the S12, adding 0.3-kgV-50 initiator, and reacting at 85 ℃ for 1h in a heat-preserving way; naturally cooling, filtering and discharging to obtain core-shell emulsion;
s23: mixing 20kg of core-shell emulsion, 3.5kg of PVA-205 and 6.3kg of water to obtain a dispersion liquid, and spray-drying to obtain chitosan modified renewable dispersion emulsion powder;
step 3:
30kg of crushed stone, 34kg of sand, 18kg of cement, 1kg of polyethylene fiber, 1kg of chitosan modified renewable dispersible emulsion powder, 8.6kg of water, 0.5kg of mineral powder, 0.14kg of sodium sulfate, 0.2kg of magnesium sulfate, 0.15kg of sodium gluconate and 0.3kg of polycarboxylate water reducer are mixed to obtain the sprayed concrete material.
Comparative example 1: the sprayed concrete material was prepared without adding chitosan modified renewable dispersion emulsion powder, and the remaining parameters were the same as in example 1.
30kg of crushed stone, 34kg of sand, 18kg of cement, 1kg of polyethylene fiber, 8.6kg of water, 0.5kg of mineral powder, 0.14kg of sodium sulfate, 0.2kg of magnesium sulfate, 0.15kg of sodium gluconate and 0.3kg of polycarboxylate water reducer are mixed to obtain the sprayed concrete material.
Comparative example 2:
the chitosan derivative is not added to prepare the chitosan modified renewable dispersion emulsion powder, and the prepared renewable dispersion emulsion powder is used for preparing the sprayed concrete material, and the rest parameters are the same as those of the example 2.
Step 1:
s11: 42kg of butyl acrylate, 15kg of ethyl acrylate and 43kg of water are mixed and stirred uniformly to obtain a mixed monomer A for standby;
s12: mixing 10kg of mixed monomer A and 0.28kg of sodium chloride, and rapidly stirring and emulsifying for 25min; heating to 75 ℃ and adding 0.1-kgV-50 initiator, dropwise adding the rest mixed monomer A and 0.12-kgV-50 initiator after reacting for 0.5h, wherein the dropwise adding time is 1h, and preserving heat for reacting for 0.5h after dropwise adding to obtain a nuclear emulsion;
step 2:
s21: mixing 30kg of sodium p-vinylbenzene sulfonate, 3kg of methyl methacrylate and 4.8kg of acrylamide to obtain a mixed monomer B;
s22: adding the mixed monomer B in the S21 into the nuclear emulsion of the S12, adding 0.3-kgV-50 initiator, and reacting at 80 ℃ for 1h in a heat-preserving way; naturally cooling, filtering and discharging to obtain core-shell emulsion;
s23: mixing 20kg of core-shell emulsion, 3.5kg of PVA-205 and 6.3kg of water to obtain a dispersion liquid, and spray-drying to obtain renewable dispersed emulsion powder;
step 3:
30kg of crushed stone, 34kg of sand, 18kg of cement, 1kg of polyethylene fiber, 1kg of renewable dispersed emulsion powder, 8.6kg of water, 0.5kg of mineral powder, 0.14kg of sodium sulfate, 0.2kg of magnesium sulfate, 0.15kg of sodium gluconate and 0.3kg of polycarboxylate water reducer are mixed to obtain the sprayed concrete material.
Comparative example 3: the amounts of carboxymethyl chitosan and sodium p-vinylbenzene sulfonate in the mixed monomer B are increased, and the prepared chitosan modified renewable dispersion emulsion powder is used for preparing sprayed concrete materials, and the rest parameters are the same as those of the example 3.
Step 1:
s11: 42kg of butyl acrylate, 15kg of ethyl acrylate and 43kg of water are mixed and stirred uniformly to obtain a mixed monomer A for standby;
s12: mixing 10kg of mixed monomer A, 3.5kg of chitosan quaternary ammonium salt and 0.28kg of sodium chloride, and rapidly stirring and emulsifying for 25min; heating to 75 ℃ and adding 0.14-kgV-50 initiator, dropwise adding the rest mixed monomer A and 0.13-kgV-50 initiator after reacting for 0.8h, wherein the dropwise adding time is 1.5h, and preserving heat for reacting for 0.5h after dropwise adding to obtain nuclear emulsion;
step 2:
s21: mixing 5kg of carboxymethyl chitosan and 50kg of sodium p-vinylbenzene sulfonate, stirring and reacting for 0.5h, and adding 3kg of methyl methacrylate and 4.8kg of acrylamide to obtain a mixed monomer B;
s22: adding the mixed monomer B in the S21 into the nuclear emulsion of the S12, adding 0.3-kgV-50 initiator, and reacting for 0.5h at 82 ℃ in a heat-preserving way; naturally cooling, filtering and discharging to obtain core-shell emulsion;
s23: mixing 20kg of core-shell emulsion, 3.5kg of PVA-205 and 6.3kg of water to obtain a dispersion liquid, and spray-drying to obtain chitosan modified renewable dispersion emulsion powder;
step 3:
30kg of crushed stone, 34kg of sand, 18kg of cement, 1kg of polyethylene fiber, 1kg of chitosan modified renewable dispersible emulsion powder, 8.6kg of water, 0.5kg of mineral powder, 0.14kg of sodium sulfate, 0.2kg of magnesium sulfate, 0.15kg of sodium gluconate and 0.3kg of polycarboxylate water reducer are mixed to obtain the sprayed concrete material.
Experiment:
the sprayed concrete materials prepared in examples 1 to 6 and comparative examples 1 to 3 were sprayed in a 3m×3m model using a field spray panel method, cut into 1m×1m test pieces, and tested for 7d, 14d, 28d compressive strength of the test pieces. Wherein, the liquid crystal display device comprises a liquid crystal display device,
mechanical property test: compressive strength test was conducted according to GB/T5081 Standard for physical and mechanical Properties test method of concrete, and the results are shown in the following Table.
Conclusion:
the data of examples 1-6 show that the early strength concrete provided by the invention can reach more than 2MPa in 3 hours, the strength of 7d reaches more than 25MPa, the strength of 14d reaches more than 32MPa, and the strength of 28d reaches more than 40MPa.
In contrast, comparative example 1 was used as a control group of example 1, and the corresponding strengths at 3h, 7d, 14d, and 28d were lower than those of example 1 without the addition of the chitosan-modified renewable dispersion emulsion powder, indicating that the chitosan-modified renewable dispersion emulsion powder has a promoting effect on the curing of concrete. In comparative example 2, the chitosan derivative was not added at the time of preparing the chitosan-modified renewable dispersion emulsion powder, so that the strength of the concrete in example 2 was higher. The use amount of the shell emulsion is increased in comparative example 3, so that the contents of carboxymethyl chitosan and sodium p-vinylbenzene sulfonate in the chitosan modified renewable dispersion emulsion powder are higher, and the hydration of cement particles is delayed, so that the early strength of the concrete in comparative example 3 is poorer than that in example 3.
Finally, it should be noted that: the foregoing description is only a preferred embodiment of the present invention, and the present invention is not limited thereto, but it is to be understood that modifications and equivalents of some of the technical features described in the foregoing embodiments may be made by those skilled in the art, although the present invention has been described in detail with reference to the foregoing embodiments. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. A processing technology of an early-strength quick-setting sprayed concrete material is characterized in that: the method comprises the following steps:
step 1:
s11: mixing butyl acrylate, ethyl acrylate and water uniformly to obtain a mixed monomer A for later use;
s12: mixing the mixed monomer A in the step S11, chitosan quaternary ammonium salt and sodium chloride, and mixing and reacting the mixed monomer A with a V-50 initiator to obtain a nuclear emulsion;
step 2:
s21: mixing and stirring carboxymethyl chitosan and sodium p-vinylbenzene sulfonate for reaction, and adding methyl methacrylate and acrylamide to obtain a mixed monomer B;
s22: adding the mixed monomer B in the step S21 into the core emulsion of the step S12, adding a V-50 initiator, carrying out heat preservation reaction, naturally cooling, filtering and discharging to obtain core-shell emulsion;
s23: mixing the core-shell emulsion, PVA-205 and water to obtain a dispersion liquid, and spray-drying to obtain chitosan modified renewable dispersion emulsion powder;
step 3:
mixing the crushed stone, sand, cement, polyethylene fiber, chitosan modified renewable dispersed emulsion powder, water, mineral powder, sodium sulfate, magnesium sulfate, sodium gluconate and water reducer to obtain the sprayed concrete material.
2. The process for producing an early strength quick setting shotcrete material according to claim 1, wherein: in S11, the content of each component in the mixed monomer A is 40-44 parts by weight of butyl acrylate, 10-16 parts by weight of ethyl acrylate and 40-50 parts by weight of water.
3. The process for producing an early strength quick setting shotcrete material according to claim 1, wherein: in S12, the specific preparation method of the nuclear emulsion comprises the following steps: mixing 8-10 parts of mixed monomer A, 2-4 parts of chitosan quaternary ammonium salt and 0.1-0.3 part of sodium chloride, rapidly stirring and emulsifying for 20-30 min, and heating to 75-85 ℃; adding 0.1-0.2 part of V-50 initiator, reacting for 0.5-1 h, dripping the rest mixed monomer A in S11 and 0.1-0.15 part of V-50 initiator for 1-2 h, and preserving heat for reacting for 0.5-1 h after dripping.
4. The process for producing an early strength quick setting shotcrete material according to claim 1, wherein: in S21, the content of each component in the mixed monomer B is 1-2 parts by weight of carboxymethyl chitosan, 25-32 parts by weight of sodium p-vinylbenzene sulfonate, 3-4 parts by weight of methyl methacrylate and 3-5 parts by weight of acrylamide.
5. The process for producing an early strength quick setting shotcrete material according to claim 1, wherein: in S22, the preparation method of the core-shell emulsion comprises the following steps: adding the S21 mixed monomer B into the nuclear emulsion of S12, adding a V-50 initiator, and reacting for 0.5h at 80-85 ℃ in a heat-preserving way; and naturally cooling, filtering and discharging to obtain the core-shell emulsion.
6. The process for producing an early strength quick setting shotcrete material according to claim 1, wherein: in S23, the content of each component in the dispersion liquid is 20-30 parts by weight of core-shell emulsion, 3-5 parts by weight of PVA-205 and 5-7 parts by weight of water.
7. The process for producing an early strength quick setting shotcrete material according to claim 1, wherein: in the step 3, the sprayed concrete material comprises, by weight, 30-33 parts of broken stone, 34-38 parts of sand, 15-18 parts of cement, 0.5-1 part of polyethylene fiber, 0.5-1.2 parts of chitosan modified renewable dispersion emulsion powder, 7-10 parts of water, 0.3-0.8 part of mineral powder, 0.1-0.3 part of sodium sulfate, 0.1-0.2 part of magnesium sulfate, 0.1-0.15 part of sodium gluconate and 0.2-0.3 part of water reducer.
8. The process for producing an early strength quick setting shotcrete material according to claim 1, wherein: in the step 3, the water reducing agent is any one of a polycarboxylate water reducing agent or a naphthalene sulfonate water reducing agent.
9. The process for producing an early strength quick setting shotcrete material according to claim 1, wherein: in the step 3, the length of the polyethylene fiber is 8-12 mm; the particle size of the crushed stone is 5-10 mm.
10. A shotcrete material processed by the process of any one of claims 1 to 9.
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| CN117303792A (en) * | 2023-11-27 | 2023-12-29 | 辽宁鹏硕科技有限公司 | Concrete air-tight agent and preparation method thereof |
| CN117303792B (en) * | 2023-11-27 | 2024-01-26 | 辽宁鹏硕科技有限公司 | Concrete air-tight agent and preparation method thereof |
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