CN116768524A - Nanometer rebound inhibitor, preparation method thereof and application thereof in sprayed concrete - Google Patents
Nanometer rebound inhibitor, preparation method thereof and application thereof in sprayed concrete Download PDFInfo
- Publication number
- CN116768524A CN116768524A CN202310779064.5A CN202310779064A CN116768524A CN 116768524 A CN116768524 A CN 116768524A CN 202310779064 A CN202310779064 A CN 202310779064A CN 116768524 A CN116768524 A CN 116768524A
- Authority
- CN
- China
- Prior art keywords
- nano
- rebound
- concrete
- polyvinyl alcohol
- water
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 239000003112 inhibitor Substances 0.000 title claims abstract description 55
- 239000011378 shotcrete Substances 0.000 title claims abstract description 27
- 238000002360 preparation method Methods 0.000 title abstract description 10
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 63
- 239000004567 concrete Substances 0.000 claims abstract description 45
- 239000004372 Polyvinyl alcohol Substances 0.000 claims abstract description 39
- 229920002451 polyvinyl alcohol Polymers 0.000 claims abstract description 39
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 30
- 239000002562 thickening agent Substances 0.000 claims abstract description 23
- 229920000642 polymer Polymers 0.000 claims abstract description 12
- 238000002156 mixing Methods 0.000 claims description 25
- 238000003756 stirring Methods 0.000 claims description 24
- 239000003638 chemical reducing agent Substances 0.000 claims description 23
- 229920005646 polycarboxylate Polymers 0.000 claims description 17
- 238000000034 method Methods 0.000 claims description 13
- 239000012452 mother liquor Substances 0.000 claims description 13
- 239000000203 mixture Substances 0.000 claims description 12
- 229920003088 hydroxypropyl methyl cellulose Polymers 0.000 claims description 11
- 235000010979 hydroxypropyl methyl cellulose Nutrition 0.000 claims description 11
- 239000001866 hydroxypropyl methyl cellulose Substances 0.000 claims description 10
- UFVKGYZPFZQRLF-UHFFFAOYSA-N hydroxypropyl methyl cellulose Chemical group 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 claims description 10
- 239000007864 aqueous solution Substances 0.000 claims description 9
- 239000000243 solution Substances 0.000 claims description 9
- 239000008367 deionised water Substances 0.000 claims description 8
- 229910021641 deionized water Inorganic materials 0.000 claims description 8
- 229920002774 Maltodextrin Polymers 0.000 claims description 6
- 239000005913 Maltodextrin Substances 0.000 claims description 6
- 238000010438 heat treatment Methods 0.000 claims description 6
- 229940035034 maltodextrin Drugs 0.000 claims description 6
- 230000001965 increasing effect Effects 0.000 claims description 5
- GSEJCLTVZPLZKY-UHFFFAOYSA-N Triethanolamine Chemical group OCCN(CCO)CCO GSEJCLTVZPLZKY-UHFFFAOYSA-N 0.000 claims description 4
- 150000001720 carbohydrates Chemical class 0.000 claims description 4
- 239000007787 solid Substances 0.000 claims description 4
- 238000004321 preservation Methods 0.000 claims description 3
- 239000008236 heating water Substances 0.000 claims description 2
- 239000008030 superplasticizer Substances 0.000 claims description 2
- 238000005507 spraying Methods 0.000 abstract description 17
- 239000002994 raw material Substances 0.000 abstract description 5
- 239000002699 waste material Substances 0.000 abstract description 5
- 230000000295 complement effect Effects 0.000 abstract description 4
- 150000002894 organic compounds Chemical class 0.000 abstract description 4
- 230000009467 reduction Effects 0.000 abstract description 3
- 238000005260 corrosion Methods 0.000 abstract description 2
- 230000007797 corrosion Effects 0.000 abstract description 2
- 238000004904 shortening Methods 0.000 abstract description 2
- 230000002787 reinforcement Effects 0.000 abstract 1
- 238000010276 construction Methods 0.000 description 13
- 239000007921 spray Substances 0.000 description 12
- 239000000463 material Substances 0.000 description 8
- 239000002253 acid Substances 0.000 description 7
- 239000004568 cement Substances 0.000 description 5
- 230000000694 effects Effects 0.000 description 5
- 230000008569 process Effects 0.000 description 5
- 239000011435 rock Substances 0.000 description 4
- 239000004575 stone Substances 0.000 description 4
- 230000009286 beneficial effect Effects 0.000 description 3
- 238000006243 chemical reaction Methods 0.000 description 3
- 230000015271 coagulation Effects 0.000 description 3
- 238000005345 coagulation Methods 0.000 description 3
- 239000004570 mortar (masonry) Substances 0.000 description 3
- 239000004576 sand Substances 0.000 description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 230000000903 blocking effect Effects 0.000 description 2
- 230000036571 hydration Effects 0.000 description 2
- 238000006703 hydration reaction Methods 0.000 description 2
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 description 1
- 230000006978 adaptation Effects 0.000 description 1
- 239000002318 adhesion promoter Substances 0.000 description 1
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 239000012615 aggregate Substances 0.000 description 1
- 230000002776 aggregation Effects 0.000 description 1
- 238000004220 aggregation Methods 0.000 description 1
- 239000003513 alkali Substances 0.000 description 1
- 239000002585 base Substances 0.000 description 1
- 235000008429 bread Nutrition 0.000 description 1
- 235000013339 cereals Nutrition 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 239000000084 colloidal system Substances 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 238000004945 emulsification Methods 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- 230000002708 enhancing effect Effects 0.000 description 1
- 239000003822 epoxy resin Substances 0.000 description 1
- 238000009472 formulation Methods 0.000 description 1
- 230000036541 health Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 229920002521 macromolecule Polymers 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000010413 mother solution Substances 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 238000011056 performance test Methods 0.000 description 1
- 229920003023 plastic Polymers 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 229920000647 polyepoxide Polymers 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 239000003223 protective agent Substances 0.000 description 1
- 230000000979 retarding effect Effects 0.000 description 1
- 230000008719 thickening Effects 0.000 description 1
- 229920003169 water-soluble polymer Polymers 0.000 description 1
- 238000004078 waterproofing 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
- 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
- C04B2201/10—Mortars, concrete or artificial stone characterised by specific physical values for the viscosity
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
- C04B2201/50—Mortars, concrete or artificial stone characterised by specific physical values for the mechanical strength
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Inorganic Chemistry (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
The invention relates to the technical field of concrete assistants, and provides a nano rebound inhibitor, a preparation method thereof and application thereof in sprayed concrete. The components of the nano rebound inhibitor provided by the invention comprise a high molecular tackifier, a thickener, an excitant, a concrete early strength agent, polyvinyl alcohol and water. The invention adopts various polymer organic compounds as raw materials to provide performances of water reduction, reinforcement, corrosion resistance, wear resistance, collapse resistance and the like, and the performances of the polymer organic compounds complement each other and complement each other to promote, and finally the obtained nanometer rebound inhibitor can effectively improve the early strength, the workability and the durability of sprayed concrete, greatly reduce the rebound rate, and achieve the purposes of reducing the waste of concrete spraying, shortening the operation time and improving the operation environment.
Description
Technical Field
The invention relates to the technical field of concrete assistants, in particular to a nano rebound inhibitor, a preparation method thereof and application thereof in sprayed concrete.
Background
The sprayed concrete is the concrete constructed by the spraying method, and the sprayed concrete has two construction methods of dry spraying and wet spraying, wherein the dry spraying method is more commonly used. The dry spraying method is to mix cement, sand, aggregate, assistant, etc. in certain proportion, then to set the mixture into a sprayer, to convey the mixture to the spray head along the pipeline with compressed air, to mix with water and to spray the mixture onto the working surface at high speed. The wet spraying method is to mix the raw materials with water in advance and spray the mixture. Sprayed concrete is commonly used for thin-wall structures such as tunnel liners, walls, ceilings and the like.
Rebound is a common phenomenon in the construction process of sprayed concrete, and the specific degree of rebound is usually expressed by the rebound rate, which is the percentage of the mass of concrete that is rebound and splashed after being sprayed on a sprayed surface to the total mass of concrete used in spraying.
At present, the wet spraying of the water-rich section is not easy to occur in the tunnel construction process of sprayed concrete, the rebound rate of the common section is high (more than 30%), the waste of raw materials is large, the operation time is long, the dust content in the air of a construction site is too high, and the health and the safety of constructors are easily threatened.
Disclosure of Invention
In view of the above, the invention provides a nano rebound inhibitor, a preparation method thereof and application thereof in sprayed concrete. The nano rebound inhibitor provided by the invention can effectively reduce the rebound rate of sprayed concrete, solve the problem that wet spraying of a water-rich section is not possible, reduce the waste of sprayed concrete and improve the working efficiency.
In order to achieve the above object, the present invention provides the following technical solutions:
the nanometer rebound inhibitor comprises the following components in percentage by mass:
0.03 to 15 percent of high molecular tackifier, 7 to 15 percent of thickener, 0.5 to 5 percent of excitant, 1.5 to 3 percent of concrete early strength agent, 0.05 to 0.08 percent of polyvinyl alcohol and the balance of deionized water; the excitant is polycarboxylate water reducer mother liquor; the molecular weight of the polyvinyl alcohol is 12-15 ten thousand; the thickener is an organic carbohydrate.
Preferably, the high molecular tackifier is hydroxypropyl methylcellulose.
Preferably, the thickener is maltodextrin.
Preferably, the concrete early strength agent is triethanolamine.
The polycarboxylate water reducer in the polycarboxylate water reducer mother liquor is a general polycarboxylate high-performance water reducer; the solid content of the polycarboxylate superplasticizer mother liquor is 30-50wt%.
The invention also provides a preparation method of the nano rebound inhibitor, which comprises the following steps:
first mixing part of water and polyvinyl alcohol to obtain a polyvinyl alcohol aqueous solution;
and (3) carrying out second mixing on the residual water and the polyvinyl alcohol aqueous solution, and carrying out third mixing on the obtained second mixture, the concrete early strength agent, the exciting agent, the high polymer tackifier and the thickening agent to obtain the nano rebound inhibitor.
Preferably, the first mixing comprises: heating part of water to 87-93 ℃, then adding polyvinyl alcohol, and stirring for 2-3 h under the condition of heat preservation.
Preferably, the second mixing comprises: heating water to 47-53 ℃, and then adding the polyvinyl alcohol solution under stirring for mixing.
Preferably, the third mixing comprises: and controlling the temperature of the second mixture to be 47-53 ℃, then sequentially adding the concrete early strength agent, the exciting agent, the thickening agent and the high polymer tackifier in a stirring state, and continuously stirring for 1-3 hours after the addition is finished.
The invention also provides application of the nano rebound inhibitor prepared by the scheme or the preparation method of the scheme in sprayed concrete.
The invention provides a nano rebound inhibitor which comprises the following components in percentage by mass: 0.03 to 15 percent of high molecular tackifier, 7 to 15 percent of thickener, 0.5 to 5 percent of excitant, 1.5 to 3 percent of concrete early strength agent, 0.05 to 0.08 percent of polyvinyl alcohol and the balance of deionized water; the excitant is polycarboxylate water reducer mother liquor; the molecular weight of the polyvinyl alcohol is 12-15 ten thousand; the thickener is an organic carbohydrate. The invention adopts various polymer organic compounds as raw materials to provide performances such as water reduction, enhancement, corrosion resistance, wear resistance, collapse protection and the like, and the performances of all the polymer organic compounds complement each other and complement each other to promote, and finally the obtained nanometer rebound inhibitor can effectively improve the early strength, the workability and the durability of spray alkali, greatly reduce the rebound rate, and achieve the purposes of reducing the waste of concrete spray, shortening the operation time and improving the operation environment. The nano rebound inhibitor provided by the invention is applied to sprayed concrete, and has the following beneficial effects:
(1) The fluidity of the sprayed concrete is good, the flowing process is fast, the slump is increased, the expansion degree is good under the condition of unchanged water consumption, the pressure of a main pump can be greatly reduced, and the construction speed is improved; specifically, on the premise that the water-cement ratio is 0.3-0.45, the spray slump can reach 200-220 mm, the expansion degree can reach 500-530 mm, the problems of pipe blockage and slump loss are solved, the work efficiency is obviously improved, and under the same boundary conditions, the time of full ring pressing in deep roads can be saved by 0.51 hour/ring.
(2) The rebound rate of the sprayed concrete can be greatly reduced, after the nano rebound inhibitor is added, the binding force of the sprayed concrete can reach 2.5-3.8 MPa (related to the doping amount of the nano rebound inhibitor) which is 1.5-2.5 times that of the common sprayed concrete, the characteristic is very beneficial to reducing the rebound rate and improving the impermeability, the rebound rate can be controlled within 8.5 percent according to the field test, the waste is effectively reduced, and the nano rebound inhibitor is an important measure for energy conservation and emission reduction; and because the viscosity of the concrete is high, the concrete can be comprehensively bonded with surrounding rock after being sprayed, so that loose stone is prevented from sliding and falling, and the stability and bearing capacity of the surrounding rock are improved.
(3) Can solve the phenomenon of mass blocking of the spray under the conditions of gushing, dripping and water spraying.
(4) The spraying speed is high, and the block is not dropped; due to high bonding strength, on the premise of improving compactness, the thickness of the primary spraying layer can reach 40-70 cm (related to the doping amount of the nano rebound inhibitor), the flatness is good, the occurrence of cavitation is avoided, the construction speed can be accelerated to a certain extent, and the working efficiency is improved.
(5) Under the condition that the dosage of the accelerator is reduced, the coagulation speed is high, the final coagulation can be realized within 35min, the early strength is 1.5-3 times higher, surrounding rock can be effectively sealed and reinforced in time, the bearing capacity of the surrounding rock is improved, and the operation cycle is accelerated.
(6) The strength of each age is high. According to different mixing amounts, the 8h strength of the concrete using the nano rebound inhibitor reaches more than 1MPa, the 1d strength can reach 15MPa, and the 28d strength can reach 50MPa.
(7) The water-rich area support has good use effect, the standard test block is manufactured by doping the product of the invention, the 28d age impervious grade can reach P12, and the strength is not affected. The spray process which cannot be completed in the water seepage hole section by conventional spray coagulation can be solved, and meanwhile, the spray process can play a role in blocking the water in a low-pressure water area or under auxiliary measures.
Detailed Description
The invention provides a nano rebound inhibitor which comprises the following components in percentage by mass:
0.03 to 15 percent of high molecular tackifier, 7 to 15 percent of thickener, 0.5 to 5 percent of excitant, 1.5 to 3 percent of concrete early strength agent, 0.05 to 0.08 percent of polyvinyl alcohol and the balance of deionized water; the excitant is polycarboxylate water reducer mother liquor; the molecular weight of the polyvinyl alcohol is 12-15 ten thousand; the thickener is an organic carbohydrate.
All the raw materials used in the present invention are commercially available unless otherwise specified.
The nano rebound inhibitor provided by the invention comprises 0.03-15% of a high molecular tackifier, and preferably 0.05-12% by mass. In the present invention, the polymer tackifier is preferably hydroxypropyl methylcellulose (HPMC, CAS number: 9004-65-3), and in the specific embodiment of the present invention, hydroxypropyl methylcellulose of 20 ten thousand viscosity is preferably used; the hydroxypropyl methylcellulose can be thickened through hydration expansion, the system of the hydroxypropyl methylcellulose shows obvious pseudo-plastic rheological morphology, and the hydroxypropyl methylcellulose is a water-soluble polymer with excellent surface activity, can play a role of a colloid protective agent, and can effectively prevent aggregation of polymer particles; in addition, hydroxypropyl methylcellulose also has the following characteristics: the water-retaining property can improve phenomena of poor hardening, cracking and the like caused by too fast drying and insufficient hydration of cement; workability, the plasticity of mortar is increased, the industrialization of construction steamed bread coating is improved, and the working efficiency is improved; the adhesion property is improved, so that the base material and the adhered object can be adhered better due to the improvement of the plasticity of the mortar; anti-slip, because of its tackifying effect, can prevent mortar and adherends from slipping during construction.
The nano rebound inhibitor provided by the invention comprises 7-15% of a thickening agent, preferably 8-13% of a thickening agent. In the present invention, the thickener is preferably maltodextrin (formula: C 6 H 12 O 6 CAS number: 9050-36-6); the maltodextrin has good emulsification and multiplicationThe thickening effect is used for increasing viscosity and enhancing product dispersibility and solubility.
The nano rebound inhibitor provided by the invention comprises 0.5-5% of an exciting agent, preferably 3-4% of an exciting agent in percentage by mass; the exciting agent is preferably polycarboxylate water reducer mother liquor, and the polycarboxylate water reducer in the polycarboxylate water reducer mother liquor is preferably general-purpose polycarboxylate high-performance water reducer; the solid content of the polycarboxylate water reducer mother liquor is preferably 30-50 wt%, more preferably 45wt%; the polycarboxylic acid high-performance water reducer has no special requirement, and the commercial general polycarboxylic acid water reducer mother liquor well known to the person skilled in the art is adopted, specifically, the SPC-100 polycarboxylic acid high-performance water reducer.
The nano rebound inhibitor provided by the invention comprises 1.5-3% of concrete early strength agent, preferably 1.8-2.1% by mass percent. In the invention, the concrete early strength agent is preferably triethanolamine.
The nano rebound inhibitor provided by the invention comprises 0.05-0.08% of polyvinyl alcohol, preferably 0.06-0.07%; the molecular weight of the polyvinyl alcohol is preferably 12-15 ten thousand; the polyvinyl alcohol can promote the cementing material and coarse and fine aggregates in the concrete to be mutually bonded, is beneficial to increasing the workability of the concrete, and is a high-quality adhesion promoter.
The nano rebound inhibitor provided by the invention comprises the balance of water in percentage by mass. In the present invention, the water is preferably deionized water; in an embodiment of the present invention, deionized water filtered with an epoxy resin is used.
The invention also provides a preparation method of the nano rebound inhibitor, which comprises the following steps:
first mixing part of water and polyvinyl alcohol to obtain a polyvinyl alcohol aqueous solution;
and (3) carrying out second mixing on the residual water and the polyvinyl alcohol aqueous solution, and carrying out third mixing on the obtained second mixture, the concrete early strength agent, the exciting agent, the high polymer tackifier and the thickening agent to obtain the nano rebound inhibitor.
The invention carries out first mixing on part of water and polyvinyl alcohol to obtain a polyvinyl alcohol aqueous solution. In the present invention, the first mixing preferably includes: heating part of water to 87-93 ℃ (namely 90+/-3 ℃), then adding polyvinyl alcohol, and stirring for 2-3 hours under the condition of heat preservation; the polyvinyl alcohol is preferably added slowly and is added within 10 minutes; the mass ratio of the partial water to the polyvinyl alcohol is preferably 10:1.
After the polyvinyl alcohol aqueous solution is obtained, the residual water and the polyvinyl alcohol aqueous solution are subjected to second mixing, and the obtained second mixture is subjected to third mixing with a concrete early strength agent, an exciting agent, a high molecular tackifier and a thickening agent to obtain the nano rebound inhibitor. In the present invention, the second mixing preferably includes: heating the rest water to 47-53 ℃ (50+/-3 ℃), and then adding the polyvinyl alcohol solution under the stirring condition for mixing; the polyvinyl alcohol solution is preferably added within 30 minutes; the mass ratio of the residual water to the aqueous polyvinyl alcohol solution is preferably 10:1.
In the present invention, the third mixing preferably includes: controlling the temperature of the second mixture to be 47-53 ℃ (namely 50+/-3 ℃), then sequentially adding the concrete early strength agent, the exciting agent, the thickening agent and the high polymer tackifier in a stirring state, and continuously stirring for 1-3 hours after the addition is finished; the invention preferably stirs for 10-20 min after the concrete early strength agent, preferably stirs for 15min, make the concrete early strength agent fully dissolve, then add excitant, after adding excitant, preferably stir for 1h, then add macromolecule tackifier and thickening agent, keep the temperature and stir for 1-3 h, preferably stir for 2h after finishing adding; the addition time of the thickener is preferably controlled within 30min, and the addition time of the tackifier is preferably controlled within 10 min.
The invention also provides application of the nano rebound inhibitor prepared by the scheme or the preparation method of the scheme in sprayed concrete. In the invention, the addition amount of the nano rebound inhibitor is preferably 4-6% of the mass of the cementing material in the sprayed concrete; the preparation method of the nano rebound inhibitor has no special requirement, and the nano rebound inhibitor can be applied by adopting a method well known to a person skilled in the art; in the concrete embodiment of the invention, the nano rebound inhibitor is added into concrete, and then spray construction is carried out.
The following description of the embodiments of the present invention will clearly and fully describe the technical solutions of the present invention, and it is apparent that the described embodiments are only some embodiments of the present invention, 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.
Example 1
Adding 1000kg of filtered deionized water into a reaction kettle, heating to 90+/-3 ℃, slowly adding 10kg of polyvinyl alcohol (with the molecular weight of 15 ten thousand) after reaching the required temperature, stirring (the adding is completed within 10 min), keeping the temperature at 90+/-3 ℃ after adding the polyvinyl alcohol, and continuously stirring for 2h until the materials are uniformly dissolved, thus obtaining a polyvinyl alcohol solution;
adding 1000kg of filtered deionized water into a reaction kettle, heating to 50+/-3 ℃, slowly adding 100kg of polyvinyl alcohol solution prepared by the steps after reaching the required temperature, stirring (controlling the temperature to be within 30 min), keeping the temperature at 50+/-3 ℃, adding 25kg of triethanolamine, stirring for 15min, adding 30kg of mother solution (solid content is 40 wt%) of a general polycarboxylic acid high-performance water reducer (model SPC-100), and stirring for 1h until the materials are uniformly dissolved. Maintaining the temperature at 50+ -3deg.C, slowly adding maltodextrin 100kg (controlled within 30 min), and stirring; slowly adding 0.5kg of 20-kiloviscosity hydroxypropyl methylcellulose (controlled to be added within 30 min) at 50+/-3 ℃ and stirring; after the materials are added, the temperature is kept at 50+/-3 ℃ for constant-temperature reaction for 2 hours, and the nano rebound inhibitor is obtained.
Application example 1
The concrete comprises the following components: 500kg of cement (model is Huarun PO 425), 853kg of machine-made sand (fineness modulus is 2.7), 315kg of fine stone (5 mm-10 mm), 472kg of broken stone (10 mm-20 mm), 165kg of water, 7.5kg of polycarboxylic acid high-performance water reducer retarder, and 20kg of nano rebound inhibitor prepared in example 1.
The concrete was tested for performance in the manner of TB/T3275-2018 and the nano rebound inhibitor in the manner of GB/T8077-2012 for chloride ion content, the test results are shown in Table 1.
TABLE 1 detection results
As can be seen from the data in Table 1, after the nano rebound inhibitor is added, all aspects of indexes of the concrete meet the national standard and the iron standard requirements.
Test of permeation resistance rating: the anti-permeation grade was tested according to the method in JC474-2008 "concrete waterproofing agent", 6 (150 mm×150 mm) concrete test pieces (concrete formulation using application example 1) were prepared with the rebound inhibitor (doping amount 4%) prepared in example 1; 6 standard concrete test blocks of 28d age (150 mm. Times.150 mm); the water pressure of the watertight instrument is set to be 1.2MPa; after the set water pressure is reached and kept for 1h, 5 reference test blocks are infiltrated, and the test blocks doped with the rebound inhibitor of the invention are not infiltrated, so that the rebound inhibitor of the invention is doped to increase the impermeability grade of the concrete, and the impermeability grade is P12.
Application example 2
The nano rebound inhibitor prepared in the example 1 is added into sprayed concrete, the adding amount is respectively 4% and 6% of the mass of the cementing material, and the proportion of the sprayed concrete is as follows: 420kg of Huarun PO425 cement, 881kg of machine-made sand (fineness modulus is 2.7), 881kg of fine stone (grain diameter is 5-10 mm), 168kg of water, 5kg of polycarboxylic acid high-performance water reducer retarding type water reducer, the adopted spraying method is wet spraying, the adopted accelerator is alkali-free liquid accelerator during spraying construction, and the dosage of the accelerator is 7% of the mass of a cementing material.
The rebound rate was measured according to the method in the rebound rate test of shotcrete in JGJ/T372-2016 technical Specification for shotcrete application, and slump, expansion degree, primary spray layer thickness were tested, and final setting time, early strength, adhesive force, etc. of the concrete added with the nano rebound inhibitor were tested, and the test results are shown in Table 2.
Table 2 test results
As can be seen from the results in Table 2, after 4 to 6% of the rebound inhibitor of the present invention was added to the sprayed concrete, the slump and the expansion degree of the concrete were not greatly changed, and the construction state of the concrete was maintained. After wet spraying construction, the concrete setting time is obviously accelerated, the compressive strength and the binding force are obviously enhanced, and the effect can accelerate the construction progress and ensure that the concrete quality index is completely qualified.
Example 2
Other conditions were the same as in example 1 except that the amount of hydroxypropyl methylcellulose was changed to 0.8kg.
Example 3
Other conditions were the same as in example 1, except that the amount of the mother liquor of the polycarboxylic acid high-performance water-reducing agent was changed to 8kg and the amount of maltodextrin was changed to 150kg.
The nano rebound inhibitors prepared in examples 2 to 3 were subjected to performance test in the same manner as in application examples 1 to 2, and the result was similar to example 1.
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 (10)
1. The nano rebound inhibitor is characterized by comprising the following components in percentage by mass:
0.03 to 15 percent of high molecular tackifier, 7 to 15 percent of thickener, 0.5 to 5 percent of excitant, 1.5 to 3 percent of concrete early strength agent, 0.05 to 0.08 percent of polyvinyl alcohol and the balance of deionized water; the excitant is polycarboxylate water reducer mother liquor; the molecular weight of the polyvinyl alcohol is 12-15 ten thousand; the thickener is an organic carbohydrate.
2. The nano-rebound inhibitor of claim 1, wherein the polymeric viscosity increasing agent is hydroxypropyl methylcellulose.
3. The nano-rebound inhibitor of claim 1, wherein the thickener is maltodextrin.
4. The nano-rebound inhibitor of claim 1, wherein the concrete early strength agent is triethanolamine.
5. The nano rebound inhibitor of claim 1, wherein the polycarboxylate water reducer in the polycarboxylate water reducer mother liquor is a general-purpose polycarboxylate high-performance water reducer; the solid content of the polycarboxylate superplasticizer mother liquor is 30-50wt%.
6. The method for preparing the nano rebound inhibitor according to any one of claims 1 to 5, comprising the steps of:
first mixing part of water and polyvinyl alcohol to obtain a polyvinyl alcohol aqueous solution;
and (3) carrying out second mixing on the residual water and the polyvinyl alcohol aqueous solution, and carrying out third mixing on the obtained second mixture, the concrete early strength agent, the exciting agent, the high polymer tackifier and the thickening agent to obtain the nano rebound inhibitor.
7. The method of preparing according to claim 6, wherein the first mixing comprises: heating part of water to 87-93 ℃, then adding polyvinyl alcohol, and stirring for 2-3 h under the condition of heat preservation.
8. The method of preparing according to claim 6, wherein the second mixing comprises: heating water to 47-53 ℃, and then adding the polyvinyl alcohol solution under stirring for mixing.
9. The method of preparing according to claim 6, wherein the third mixing comprises: and controlling the temperature of the second mixture to be 47-53 ℃, then sequentially adding the concrete early strength agent, the exciting agent, the thickening agent and the high polymer tackifier in a stirring state, and continuously stirring for 1-3 hours after the addition is finished.
10. Use of a nano rebound inhibitor according to any one of claims 1 to 5 or a nano rebound inhibitor prepared by a method according to any one of claims 6 to 9 in shotcrete.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310779064.5A CN116768524A (en) | 2023-06-29 | 2023-06-29 | Nanometer rebound inhibitor, preparation method thereof and application thereof in sprayed concrete |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310779064.5A CN116768524A (en) | 2023-06-29 | 2023-06-29 | Nanometer rebound inhibitor, preparation method thereof and application thereof in sprayed concrete |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN116768524A true CN116768524A (en) | 2023-09-19 |
Family
ID=88011243
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202310779064.5A Pending CN116768524A (en) | 2023-06-29 | 2023-06-29 | Nanometer rebound inhibitor, preparation method thereof and application thereof in sprayed concrete |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN116768524A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN118084387A (en) * | 2024-02-01 | 2024-05-28 | 湖北葛科工程试验检测有限公司 | Rebound reducing agent for sprayed concrete in tunnel engineering and preparation method thereof |
-
2023
- 2023-06-29 CN CN202310779064.5A patent/CN116768524A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN118084387A (en) * | 2024-02-01 | 2024-05-28 | 湖北葛科工程试验检测有限公司 | Rebound reducing agent for sprayed concrete in tunnel engineering and preparation method thereof |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CA2944599C (en) | Concrete materials with modified rheology, methods of making, and uses thereof | |
| CN102503285B (en) | Polymer modified early strength repair mortar and preparation method and application thereof | |
| CN102924019B (en) | High-strength micro-expansive grouting material and its preparation method | |
| CN104310839B (en) | Concrete intensifier and preparation method | |
| JPH11507002A (en) | Stable suspension system of hydrocolloid and superplasticizer | |
| CN107793098B (en) | High-fluidity rapid repair mortar | |
| CA2609853A1 (en) | Fast binder compositions for concrete parts and works containing a calcium salt | |
| CN108328977B (en) | Concrete repairing material | |
| CN110451842B (en) | Viscosity adjusting admixture for jetting construction and preparation method thereof | |
| CN108358564A (en) | A kind of high ductility cement-base composite material and preparation method thereof | |
| CN110627449A (en) | C60 expansion self-compaction high-strength concrete and preparation method thereof | |
| CN116768524A (en) | Nanometer rebound inhibitor, preparation method thereof and application thereof in sprayed concrete | |
| CN112048035A (en) | Concrete segregation repairing agent and preparation method thereof | |
| JP2003313069A (en) | High fluidity mortar composition for floor face application | |
| CN106431153A (en) | Phosphoaluminate cement-based rapid repairing material and preparation method thereof | |
| CN117923828A (en) | Composite type bullet reducing agent, preparation method thereof and sprayed concrete | |
| CN111848066A (en) | Rapid road repairing mortar and construction process thereof | |
| CN111606625A (en) | Formula and preparation method of C70 high-strength self-compacting concrete | |
| CN109704693B (en) | Sulphoaluminate cement-based self-compacting mortar and use method thereof | |
| CN105000847B (en) | A kind of post-stressed hole path pressure grouting material of corrosion-prevention rust-resistance type and preparation method thereof | |
| CN115180900B (en) | Ultrahigh-performance premixed pervious concrete and preparation method thereof | |
| CN113831085B (en) | Cement-styrene-acrylic emulsion and waterborne epoxy resin grouting material | |
| CN115477518A (en) | Sprayable ultra-high-toughness cement-based composite material and preparation method and application thereof | |
| KR100859776B1 (en) | Compositions of accelerating agent for making shotcrete | |
| CN105503100B (en) | A kind of road and bridge engineering reinforcing high performance grouting material and preparation method thereof |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |