CN114988752B - Preparation and application methods of composition for reducing rebound of sprayed concrete - Google Patents
Preparation and application methods of composition for reducing rebound of sprayed concrete Download PDFInfo
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- CN114988752B CN114988752B CN202210750922.9A CN202210750922A CN114988752B CN 114988752 B CN114988752 B CN 114988752B CN 202210750922 A CN202210750922 A CN 202210750922A CN 114988752 B CN114988752 B CN 114988752B
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- 239000011378 shotcrete Substances 0.000 title claims abstract description 32
- 239000000203 mixture Substances 0.000 title claims abstract description 30
- 238000000034 method Methods 0.000 title claims abstract description 24
- 238000002360 preparation method Methods 0.000 title abstract description 7
- 239000002270 dispersing agent Substances 0.000 claims abstract description 52
- 239000004567 concrete Substances 0.000 claims abstract description 51
- 239000007921 spray Substances 0.000 claims abstract description 21
- 239000006070 nanosuspension Substances 0.000 claims description 40
- 125000003118 aryl group Chemical group 0.000 claims description 39
- 125000001301 ethoxy group Chemical group [H]C([H])([H])C([H])([H])O* 0.000 claims description 35
- 229940126062 Compound A Drugs 0.000 claims description 32
- NLDMNSXOCDLTTB-UHFFFAOYSA-N Heterophylliin A Natural products O1C2COC(=O)C3=CC(O)=C(O)C(O)=C3C3=C(O)C(O)=C(O)C=C3C(=O)OC2C(OC(=O)C=2C=C(O)C(O)=C(O)C=2)C(O)C1OC(=O)C1=CC(O)=C(O)C(O)=C1 NLDMNSXOCDLTTB-UHFFFAOYSA-N 0.000 claims description 32
- 229920002521 macromolecule Polymers 0.000 claims description 32
- 238000005507 spraying Methods 0.000 claims description 23
- 238000003756 stirring Methods 0.000 claims description 19
- 239000011858 nanopowder Substances 0.000 claims description 14
- 229920000642 polymer Polymers 0.000 claims description 12
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 11
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 11
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 claims description 10
- RTZKZFJDLAIYFH-UHFFFAOYSA-N Diethyl ether Chemical compound CCOCC RTZKZFJDLAIYFH-UHFFFAOYSA-N 0.000 claims description 10
- 239000011259 mixed solution Substances 0.000 claims description 10
- 239000008367 deionised water Substances 0.000 claims description 9
- 229910021641 deionized water Inorganic materials 0.000 claims description 9
- 239000000243 solution Substances 0.000 claims description 9
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical class [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims description 8
- 238000005054 agglomeration Methods 0.000 claims description 7
- 230000002776 aggregation Effects 0.000 claims description 7
- 230000032683 aging Effects 0.000 claims description 7
- 238000010008 shearing Methods 0.000 claims description 7
- RRDQTXGFURAKDI-UHFFFAOYSA-N formaldehyde;naphthalene-2-sulfonic acid Chemical compound O=C.C1=CC=CC2=CC(S(=O)(=O)O)=CC=C21 RRDQTXGFURAKDI-UHFFFAOYSA-N 0.000 claims description 6
- 229920000056 polyoxyethylene ether Polymers 0.000 claims description 6
- WNROFYMDJYEPJX-UHFFFAOYSA-K aluminium hydroxide Chemical compound [OH-].[OH-].[OH-].[Al+3] WNROFYMDJYEPJX-UHFFFAOYSA-K 0.000 claims description 5
- 229910000019 calcium carbonate Inorganic materials 0.000 claims description 5
- 229940051841 polyoxyethylene ether Drugs 0.000 claims description 5
- QDEDSOUOGVNKAR-UHFFFAOYSA-N anthracene-1-sulfonic acid;formaldehyde Chemical compound O=C.C1=CC=C2C=C3C(S(=O)(=O)O)=CC=CC3=CC2=C1 QDEDSOUOGVNKAR-UHFFFAOYSA-N 0.000 claims description 4
- HXHCOXPZCUFAJI-UHFFFAOYSA-N prop-2-enoic acid;styrene Chemical compound OC(=O)C=C.C=CC1=CC=CC=C1 HXHCOXPZCUFAJI-UHFFFAOYSA-N 0.000 claims description 4
- 239000002994 raw material Substances 0.000 claims description 4
- 239000000377 silicon dioxide Substances 0.000 claims description 4
- 235000012239 silicon dioxide Nutrition 0.000 claims description 4
- 229920000663 Hydroxyethyl cellulose Polymers 0.000 claims description 3
- 239000004354 Hydroxyethyl cellulose Substances 0.000 claims description 3
- 229920002153 Hydroxypropyl cellulose Polymers 0.000 claims description 3
- 238000000889 atomisation Methods 0.000 claims description 3
- 235000019447 hydroxyethyl cellulose Nutrition 0.000 claims description 3
- 229920003063 hydroxymethyl cellulose Polymers 0.000 claims description 3
- 239000001863 hydroxypropyl cellulose Substances 0.000 claims description 3
- 235000010977 hydroxypropyl cellulose Nutrition 0.000 claims description 3
- 229920005646 polycarboxylate Polymers 0.000 claims description 3
- MNCGMVDMOKPCSQ-UHFFFAOYSA-M sodium;2-phenylethenesulfonate Chemical compound [Na+].[O-]S(=O)(=O)C=CC1=CC=CC=C1 MNCGMVDMOKPCSQ-UHFFFAOYSA-M 0.000 claims description 3
- 229940031574 hydroxymethyl cellulose Drugs 0.000 claims 1
- 238000004519 manufacturing process Methods 0.000 claims 1
- 239000002105 nanoparticle Substances 0.000 abstract description 5
- 239000004568 cement Substances 0.000 abstract description 4
- 229910052500 inorganic mineral Inorganic materials 0.000 abstract 1
- 239000011707 mineral Substances 0.000 abstract 1
- 230000035945 sensitivity Effects 0.000 abstract 1
- 238000002156 mixing Methods 0.000 description 14
- 239000007788 liquid Substances 0.000 description 9
- 239000011521 glass Substances 0.000 description 8
- 238000012360 testing method Methods 0.000 description 7
- 230000001276 controlling effect Effects 0.000 description 6
- -1 ethoxyl Chemical group 0.000 description 6
- 239000002002 slurry Substances 0.000 description 6
- 230000000694 effects Effects 0.000 description 5
- 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 description 4
- GAWIXWVDTYZWAW-UHFFFAOYSA-N C[CH]O Chemical group C[CH]O GAWIXWVDTYZWAW-UHFFFAOYSA-N 0.000 description 3
- 238000010276 construction Methods 0.000 description 3
- 238000011161 development Methods 0.000 description 3
- 230000018109 developmental process Effects 0.000 description 3
- 229910021485 fumed silica Inorganic materials 0.000 description 3
- 125000004029 hydroxymethyl group Chemical group [H]OC([H])([H])* 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- YRTMFXIMEWYCDX-UHFFFAOYSA-N CC(O)=O.CC(O)=O.CC(O)=O.CC(O)=O.CCNCC Chemical compound CC(O)=O.CC(O)=O.CC(O)=O.CC(O)=O.CCNCC YRTMFXIMEWYCDX-UHFFFAOYSA-N 0.000 description 2
- 206010053567 Coagulopathies Diseases 0.000 description 2
- 230000002411 adverse Effects 0.000 description 2
- 229910052782 aluminium Inorganic materials 0.000 description 2
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 2
- 230000035602 clotting Effects 0.000 description 2
- 238000011156 evaluation Methods 0.000 description 2
- 239000003112 inhibitor Substances 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 238000005086 pumping Methods 0.000 description 2
- 238000010998 test method Methods 0.000 description 2
- BHPQYMZQTOCNFJ-UHFFFAOYSA-N Calcium cation Chemical compound [Ca+2] BHPQYMZQTOCNFJ-UHFFFAOYSA-N 0.000 description 1
- QAOWNCQODCNURD-UHFFFAOYSA-L Sulfate Chemical compound [O-]S([O-])(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-L 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- 150000004645 aluminates Chemical class 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- AXCZMVOFGPJBDE-UHFFFAOYSA-L calcium dihydroxide Chemical class [OH-].[OH-].[Ca+2] AXCZMVOFGPJBDE-UHFFFAOYSA-L 0.000 description 1
- 229910001424 calcium ion Inorganic materials 0.000 description 1
- 230000015271 coagulation Effects 0.000 description 1
- 238000005345 coagulation Methods 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 238000010668 complexation reaction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 230000036571 hydration Effects 0.000 description 1
- 238000006703 hydration reaction Methods 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- RMAQACBXLXPBSY-UHFFFAOYSA-N silicic acid Chemical compound O[Si](O)(O)O RMAQACBXLXPBSY-UHFFFAOYSA-N 0.000 description 1
- 239000002562 thickening agent Substances 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
- 230000003313 weakening effect 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
- 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
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D11/00—Lining tunnels, galleries or other underground cavities, e.g. large underground chambers; Linings therefor; Making such linings in situ, e.g. by assembling
- E21D11/04—Lining with building materials
- E21D11/10—Lining with building materials with concrete cast in situ; Shuttering also lost shutterings, e.g. made of blocks, of metal plates or other equipment adapted therefor
- E21D11/105—Transport or application of concrete specially adapted for the lining of tunnels or galleries ; Backfilling the space between main building element and the surrounding rock, e.g. with concrete
-
- 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
- Engineering & Computer Science (AREA)
- Structural Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Architecture (AREA)
- Ceramic Engineering (AREA)
- Mining & Mineral Resources (AREA)
- Materials Engineering (AREA)
- Civil Engineering (AREA)
- Organic Chemistry (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Geology (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
The invention discloses a preparation and use method of a composition for reducing rebound of sprayed concrete, which comprises the steps of adding a base station and a wet sprayed concrete spray head, enabling nano particles to quickly agglomerate to form a three-dimensional network under the condition of PH >11 by the sensitivity of Zeta potential along with the change of PH value, realizing primary support, and reducing rebound of sprayed concrete, wherein the composition is physically agglomerated and can not cause adaptability problems of a traditional accelerator due to cement mineral phases. Meanwhile, the dispersing agent in the nano sol forms pi bond with the components added into the accelerator to agglomerate, so that the accelerator is disabled, the self cohesion and the cohesive force of the concrete are further enhanced, and the rebound of the sprayed concrete is reduced.
Description
Technical Field
The invention relates to the technical field of concrete additives, in particular to a preparation and use method of a composition for reducing rebound of sprayed concrete.
Background
With the high-speed development of the economy of China, the scale and quality of the comprehensive traffic network of China are greatly improved, and the life and happiness of people are improved. In the construction process, the wet-spraying process concrete plays an irreplaceable role. In wet spraying concrete, quick setting and high initial strength are realized by an accelerator so as to achieve the aim of supporting. However, in practical application, sprayed concrete often has larger rebound due to the problems of adaptability of accelerator and cement, cohesiveness of concrete and the like, and site construction dust and construction cost are increased. In CN104446090, a durable alkali-free liquid accelerator and a preparation method thereof, silica sol and aluminum sol are added into the accelerator to be used as nano sol for sprayed concrete. However, this addition makes use of the fact that the formation of a gel in the product by the sol increases the storage stability of the accelerator and does not give full play to the gelling effect upon spraying. CN109553325, "a preparation method of modified aluminate liquid accelerator", uses diethylamine tetraacetic acid to strongly complex and stabilize alumina sol, and uses the alumina sol as pre-gel to enable the product to exert gel effect during spraying. However, after being added into a concrete system, the diethylamine tetraacetic acid also causes strong complexation to calcium ions, thereby leading to weakening of early hydration and having certain adverse effects on the coagulation time and the initial strength. In CN111995285, a sprayed concrete rebound inhibitor and a using method thereof, various nano powder and a thickening agent are adopted to be compounded and added into concrete in a blending material mode, so that the rebound is reduced. However, in fact, the nanoparticles are directly added into the concrete to cause a large amount of agglomeration, so that the viscosity of the concrete is too high, and in order to ensure that the concrete is transported and pumped smoothly, the concrete is required to have better fluidity and low viscosity, and a large amount of dispersing agent is often added to achieve the purpose. The use of large amounts of dispersant also results in a significant compromise in setting time and initial strength development in engineering sites in this manner.
Disclosure of Invention
The invention aims to overcome the defects of the prior art, and provides a preparation and use method for reducing the rebound composition of sprayed concrete, which ensures smooth transportation and pumping of the concrete and avoids the influence of a practical dispersing agent of common technical means on the setting time and initial strength of the concrete.
The aim of the invention is realized by the following technical scheme:
a method of use for reducing a shotcrete rebound composition comprising the steps of: and sequentially adding the accelerator containing the ethoxy macromolecular compound A and the nano suspension containing the aromatic dispersing agent B into the concrete conveyed to the spray head, and spraying the concrete along with the concrete from the spray head.
The spray head is additionally provided with an atomization device and two feeding systems with metering functions.
The mass of the nano suspension containing the aromatic dispersing agent B is 0.5-2% of the mass of the concrete.
The composition for reducing rebound of sprayed concrete comprises the nano suspension containing the aromatic dispersant B and an accelerator containing the ethoxy macromolecular compound A, wherein the nano suspension containing the aromatic dispersant B is prepared from the following raw materials in parts by weight: 10-20 parts of nano powder, 96-98 parts of deionized water, 2-4 parts of saturated sodium hydroxide solution and 4-7 parts of aromatic dispersing agent B; the accelerator containing the ethoxy macromolecular compound A is prepared from the following raw materials in parts by weight: 98-102 parts of accelerator and 0.5-2 parts of ethoxyl macromolecular polymer.
The nano powder is any one of silicon dioxide, aluminum hydroxide or calcium carbonate. Fumed silica is preferably used.
The aromatic dispersant B is any one of beta-naphthalene sulfonate formaldehyde condensate, anthracene sulfonate formaldehyde condensate, acrylic acid-styrene polymer and polycarboxylate containing sodium styrene sulfonate blocks. Preferably beta-naphthalene sulfonate formaldehyde condensate
The ethoxy macromolecular polymer is any one of water-soluble polyoxyethylene ether, hydroxymethyl, hydroxyethyl and hydroxypropyl cellulose ether. Water-soluble polyoxyethylene ethers are preferred.
A method of preparing the above composition comprising the steps of:
a) Preparing a nanosuspension containing an aromatic dispersant B:
a01, adding saturated sodium hydroxide solution into deionized water, and adjusting the pH to 8-10 to prepare a first mixed solution;
a02, stirring the first mixed solution, controlling the stirring speed to be more than 1000rpm, and adding nano powder in batches within 20-40 minutes;
a03, stably shearing for 20-40 minutes, adding an aromatic dispersing agent B into the mixed solution I, and aging for 20-40 minutes to prepare a nano suspension containing the aromatic dispersing agent B;
b) Preparing an accelerator containing an ethoxy macromolecular compound A:
and b01, adding an ethoxy macromolecular polymer into the accelerator, and stirring to prepare the accelerator containing the ethoxy macromolecular compound A.
The nano-powder agglomeration state is less than 0.2 microns.
The beneficial effects of the invention are as follows:
(1) The invention is a low viscosity pumpable liquid within ph=8-10, and when the PH is greater than 11 (concrete ph=12-13), the pumpable liquid can quickly agglomerate to form a three-dimensional network, and the binding capacity and the supporting capacity of sprayed concrete and an interface are increased, so that the rebound of the concrete is reduced.
(2) When the nano suspension containing the aromatic dispersing agent B contacts with the accelerator containing the ethoxy macromolecular compound A, pi bond agglomeration is generated between the nano suspension and the accelerator, so that the dispersing agent is invalid, the influence of the dispersing agent on the setting time and the initial strength of the concrete is solved, and the viscosity of the concrete can be improved through pi bond agglomeration.
(3) Compared with the addition of the dispersing agent, the nano suspension liquid needs a pump with higher power for pumping, and the metering accuracy is difficult to ensure after the high-power pump is adopted, so that excessive addition can be caused, and the material waste is caused.
(4) The invention can quickly agglomerate to form a three-position network, so that the nano particles are added at a wet spray nozzle, and are not required to be added into concrete like CN111995285 in a sprayed concrete rebound inhibitor and a using method thereof, so that a large amount of nano particles are agglomerated to cause the viscosity of the concrete to be too high, and a large amount of dispersing agents are required to be added to realize the purpose in order to ensure that the concrete is smoothly transported and pumped and the concrete has better fluidity and low viscosity. The use of large amounts of dispersant also results in a significant compromise in setting time and initial strength development in engineering sites in this manner.
(5) The accelerator containing the ethoxy macromolecular compound A is firstly added at the spray head of the wet spraying machine, and then the nano suspension containing the aromatic dispersing agent B is added, so that aluminum ions in the nano suspension containing the aromatic dispersing agent B can be fully combined with sulfate ions.
Detailed Description
The technical solutions of the present invention will be clearly and completely described below with reference to the embodiments, and it is apparent that the described embodiments are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by a person skilled in the art without any inventive effort, are intended to be within the scope of the present invention, based on the embodiments of the present invention.
The invention provides a technical scheme that:
the nano powder is any one of silicon dioxide, aluminum hydroxide or calcium carbonate.
A method of preparing a composition for reducing rebound of shotcrete comprising the steps of:
a) Preparing a nanosuspension containing an aromatic dispersant B:
a01, adding 96-98 parts of deionized water into a mixing kettle equipped with a high-speed stirrer, then adding 2-4 parts of saturated calcium hydroxide solution into the mixing kettle to prepare a first mixed solution, and adjusting the pH value of the first mixed solution to 8-10;
a02, operating a high-speed stirrer, stirring the first mixed solution, controlling the stirring speed to be more than 1000rpm, and adding 10-20 parts of nano powder in batches within 20-40 minutes;
a03, stably shearing for 20-40 minutes after the nano powder is fed, adding 4-7 parts of aromatic dispersing agent B into the mixed solution I, and aging for 20-40 minutes to prepare a nano suspension containing the aromatic dispersing agent B;
b) Preparing an accelerator containing an ethoxy macromolecular compound A:
and b01, placing 98-102 parts of accelerator into a stirring kettle, adding 0.5-2 parts of ethoxy macromolecular polymer into the stirring kettle, and stirring to prepare the accelerator containing the ethoxy macromolecular compound A.
Further, the aromatic dispersant B is any one of beta-naphthalene sulfonate formaldehyde condensate, anthracene sulfonate formaldehyde condensate, acrylic acid-styrene polymer and polycarboxylate containing sodium styrene sulfonate blocks.
Further, the ethoxyl macromolecular polymer is any one of water-soluble polyoxyethylene ether, hydroxymethyl, hydroxyethyl and hydroxypropyl cellulose ether.
Further, the nanopowder has a maximum agglomeration size <0.2 microns.
Further, the nano powder is any one of silicon dioxide, aluminum hydroxide or calcium carbonate.
A method of use for reducing a shotcrete rebound composition comprising the steps of: and sequentially adding the accelerator containing the ethoxy macromolecular compound A and the nano suspension containing the aromatic dispersing agent B into the concrete conveyed to the spray head of the wet spraying machine, and spraying the accelerator containing the ethoxy macromolecular compound A and the nano suspension containing the aromatic dispersing agent B along with the concrete from the spray head of the wet spraying machine.
Further, a feeding pipe for the accelerator containing the ethoxyl macromolecular compound A and a feeding pipe for the nano suspension containing the aromatic dispersing agent B to enter are sequentially arranged at the position of the spray head of the wet spraying machine along the transportation direction of the concrete. The two feeding pipes are provided with an atomization device for atomizing the accelerator containing the ethoxyl macromolecular compound A and the nano suspension containing the aromatic dispersing agent B, and a metering device for metering the inflow of the accelerator containing the ethoxyl macromolecular compound A and the nano suspension containing the aromatic dispersing agent B. The atomizing device is a common atomizing nozzle, the model can be Hengteng spray-HTPW-022, and the metering device is a frame building instrument-commodity number 100018623615.
Further, the mass of the nano suspension containing the aromatic dispersant B is 0.5-2% of the mass of the concrete.
Furthermore, the dosage of the accelerator containing the ethoxy macromolecular compound A is 6-10% of the mass of the concrete.
Example 1
A method of preparing a composition for reducing rebound of shotcrete comprising the steps of:
a) Preparing a nanosuspension containing an aromatic dispersant B:
a01, adding 96 parts of deionized water into a mixing kettle provided with a high-speed stirrer, adding 4 parts of saturated sodium hydroxide solution, and adjusting the pH to 10;
a02, starting stirring by a high-speed stirrer, controlling the stirring speed to 1500rpm, and adding 10 parts of fumed silica in batches within 30 minutes;
a03, stably shearing for 30 minutes, adding 4 parts of beta-naphthalene sulfonate formaldehyde condensate dispersant, and aging for 30 minutes;
b) Preparing an accelerator containing an ethoxy macromolecular compound A:
b01, 100 parts of commercial aluminum sulfate accelerator
The liquid was placed in a stirred tank and 0.5 part of water-soluble polyoxyethylene ether was added.
Example 2
A method of preparing a composition for reducing rebound of shotcrete comprising the steps of:
a) Preparing a nanosuspension containing an aromatic dispersant B:
a01, adding 98 parts of deionized water into a mixing kettle provided with a high-speed stirrer, and adding 2 parts of saturated sodium hydroxide solution to adjust the pH to 8;
a02, starting stirring by a high-speed stirrer, controlling the stirring speed to 1500rpm, and adding 20 parts of fumed silica in batches within 30 minutes;
a03, stably shearing for 30 minutes, adding 5 parts of beta-naphthalene sulfonate formaldehyde condensate dispersant, and aging for 30 minutes;
b) Preparing an accelerator containing an ethoxy macromolecular compound A:
b01, 100 parts of commercial aluminum sulfate accelerator
The liquid was placed in a stirred tank and 2 parts of water-soluble polyoxyethylene ether was added.
Example 3
A method of preparing a composition for reducing rebound of shotcrete comprising the steps of:
a) Preparing a nanosuspension containing an aromatic dispersant B:
a01, adding 97 parts of deionized water into a mixing kettle provided with a high-speed stirrer, adding 3 parts of saturated sodium hydroxide solution, and adjusting the pH to 8;
a02, starting stirring by a high-speed stirrer, controlling the stirring speed to be 1800rpm, and adding 15 parts of aluminum hydroxide in batches within 20 minutes;
a03, stably shearing for 30 minutes, adding 4 parts of anthracene sulfonate formaldehyde condensate dispersant, and aging for 30 minutes;
b) Preparing an accelerator containing an ethoxy macromolecular compound A:
b01, 98 parts of commercial aluminum sulfate accelerator
The liquid was placed in a stirred tank and 1 part of hydroxymethyl was added.
Example 4
A method of preparing a composition for reducing rebound of shotcrete comprising the steps of:
a) Preparing a nanosuspension containing an aromatic dispersant B:
a01, adding 97 parts of deionized water into a mixing kettle provided with a high-speed stirrer, adding 3 parts of saturated sodium hydroxide solution, and adjusting the pH to 9;
a02, starting stirring by a high-speed stirrer, controlling the stirring speed to 1200rpm, and adding 18 parts of calcium carbonate in batches within 30 minutes;
a03, stably shearing for 30 minutes, adding 7 parts of an acrylic acid-styrene polymer dispersing agent and aging for 30 minutes;
b) Preparing an accelerator containing an ethoxy macromolecular compound A:
b01, 102 parts of commercial aluminum sulfate accelerator
The liquid was placed in a stirred tank and 1.3 parts of hydroxyethyl was added.
Example 5
A method of use for reducing a shotcrete rebound composition comprising the steps of: the accelerator containing the ethoxy macromolecular compound A prepared in the example 1 is firstly added at the position of a spray head of a wet spraying machine which is spraying concrete, then the nano suspension containing the aromatic dispersing agent B prepared in the example 1 is added and sprayed out of the spray head of the wet spraying machine along with the concrete, the mixing amount of the nano suspension is controlled to be 2 percent of the mass of the concrete, and the dosage of the accelerator containing the ethoxy macromolecular compound A is controlled to be 10 percent of the mass of the concrete.
Example 6
A method of use for reducing a shotcrete rebound composition comprising the steps of: the accelerator of the ethoxy macromolecular compound A prepared in the example 2 is firstly added at the position of a spray head of a wet spraying machine which is spraying concrete, then the nano suspension containing the aromatic dispersing agent B prepared in the example 2 is added and sprayed out of the spray head of the wet spraying machine along with the concrete, the mixing amount of the nano suspension is controlled to be 0.5 percent of the mass of the concrete, and the dosage of the accelerator containing the ethoxy macromolecular compound A is controlled to be 6 percent of the mass of the concrete.
Example 7
A method of use for reducing a shotcrete rebound composition comprising the steps of: the accelerator of the ethoxy macromolecular compound A prepared in the example 3 is firstly added at the position of a spray head of a wet spraying machine which is spraying concrete, then the nano suspension containing the aromatic dispersing agent B prepared in the example 3 is added and sprayed out of the spray head of the wet spraying machine along with the concrete, the mixing amount of the nano suspension is controlled to be 1% of the mass of the concrete, and the using amount of the accelerator containing the ethoxy macromolecular compound A is controlled to be 8% of the mass of the concrete.
Example 8
A method of use for reducing a shotcrete rebound composition comprising the steps of: the accelerator of the ethoxy macromolecular compound A prepared in the example 4 is firstly added at the position of a spray head of a wet spraying machine which is spraying concrete, then the nano suspension containing the aromatic dispersing agent B prepared in the example 4 is added and sprayed out of the spray head of the wet spraying machine along with the concrete, the mixing amount of the nano suspension is controlled to be 1.2 percent of the mass of the concrete, and the dosage of the accelerator containing the ethoxy macromolecular compound A is controlled to be 9 percent of the mass of the concrete.
Test results
1. Evaluation of nanosuspension
200g of cement (Emeing P.O42.5) and 200g of water are stirred and mixed uniformly, added into a 250ml glass measuring cylinder to 200ml, and nano suspension is added respectively (the mixing amount is regulated until the mixing amount meets the test requirement and is inverted and does not flow out, and the mixing amount is recorded). The cylinder mouth is pressed by fingers to shake up and down for 10S, and the measuring cylinder is inverted for 1min without slurry flowing out. The amount of the mixture required in example 5 was 2%, the amount of the mixture required in example 6 was 0.5%, the amount of the mixture required in example 7 was 1%, and the amount of the mixture required in example 8 was 1.2%, and the slurry in the measuring cylinder was completely adhered to the measuring cylinder due to the formation of a three-dimensional network by agglomeration of the nanoparticles.
2. Evaluation of ejection Effect
200g of cement (Etsheng P.O42.5) and 200g of water are stirred and mixed uniformly, 20g of slurry is taken and uniformly spread in the center of a glass plate with the thickness of 50mmX and 50mm, and then the glass plate is vertically placed. At a vertical instant, 1.2g of accelerator was sprayed onto the glass plate in 5S using a ZL-LS3 hand-held (radius of action 65 mm) atomizer and 1.2g of accelerator containing POLYOX and 0.4g of example 5 or 0.1g of example 6 were simultaneously sprayed onto the glass plate in 5S using 2 ZL-LS3 atomizers. The speed at which the slurry stopped flowing on the glass plate was observed, and the accelerator alone was used to stop the flow completely at 40S, while examples 5 and 6 stopped the slurry flow completely adhered to the glass plate within 7S. Examples 7 and 8 the slurry stopped flowing and adhered completely to the glass plate within 5S.
The rebound rate of the side wall and the top arch of the C30 wet sprayed concrete is tested according to the 'hydraulic concrete test procedure' DL5721-2015, and the accelerator is singly used
As a reference group comparison, the test results were as follows:
table 1 rebound ratios for the various groups of examples
As can be seen from the test data in Table 1, the invention has obvious promotion effect on the reduction of the concrete spray rebound rate.
3. Impact on clotting time and intensity
The traditional accelerator and the invention are tested for setting time and strength according to the test method of GB/T35159-2017 accelerator for shotcrete. The test data are as follows:
table 2 comparative test of inventive examples with conventional accelerators as benchmarks
As can be seen from the test data in Table 2, the present invention does not adversely affect clotting time as well as initial strength, and has a small promoting effect on 28d strength.
The foregoing is merely a preferred embodiment of the invention, and it is to be understood that the invention is not limited to the form disclosed herein but is not to be construed as excluding other embodiments, but is capable of numerous other combinations, modifications and environments and is capable of modifications within the scope of the inventive concept, either as taught or as a matter of routine skill or knowledge in the relevant art. And that modifications and variations which do not depart from the spirit and scope of the invention are intended to be within the scope of the appended claims.
Claims (7)
1. The composition for reducing rebound of sprayed concrete is characterized by comprising a nano suspension containing an aromatic dispersant B and an accelerator containing an ethoxy macromolecular compound A, wherein the nano suspension containing the aromatic dispersant B is prepared from the following raw materials in parts by weight: 10-20 parts of nano powder, 96-98 parts of deionized water, 2-4 parts of saturated sodium hydroxide solution and 4-7 parts of aromatic dispersing agent B; the accelerator containing the ethoxy macromolecular compound A is prepared from the following raw materials in parts by weight: 98-102 parts of accelerator and 0.5-2 parts of ethoxy macromolecular polymer, wherein the aromatic dispersant B is any one of beta-naphthalene sulfonate formaldehyde condensate, anthracene sulfonate formaldehyde condensate, acrylic acid-styrene polymer and polycarboxylate containing sodium styrene sulfonate blocks, and the ethoxy macromolecular polymer is any one of water-soluble polyoxyethylene ether, hydroxymethyl cellulose ether, hydroxyethyl cellulose ether and hydroxypropyl cellulose ether.
2. A rebound composition for reducing shotcrete according to claim 1, wherein: the nano powder is any one of silicon dioxide, aluminum hydroxide or calcium carbonate.
3. A rebound composition for reducing shotcrete according to claim 1, wherein: the nano-powder agglomeration state is less than 0.2 microns.
4. A process for preparing the composition of any one of claims 1-3, comprising the steps of:
a) Preparing a nanosuspension containing an aromatic dispersant B:
a01, adding saturated sodium hydroxide solution into deionized water, and adjusting the pH to 8-10 to prepare a first mixed solution;
a02, stirring the first mixed solution, controlling the stirring speed to be more than 1000rpm, and adding nano powder in batches within 20-40 minutes;
a03, stably shearing for 20-40 minutes, adding an aromatic dispersing agent B into the mixed solution I, and aging for 20-40 minutes to prepare a nano suspension containing the aromatic dispersing agent B;
b) Preparing an accelerator containing an ethoxy macromolecular compound A:
and b01, adding an ethoxy macromolecular polymer into the accelerator, and stirring to prepare the accelerator containing the ethoxy macromolecular compound A.
5. A method of using the composition of any one of claims 1-3, comprising the steps of: and sequentially adding an accelerator containing an ethoxy macromolecular compound A and a nano suspension containing an aromatic dispersing agent B into the concrete conveyed to the spray head, and spraying the nano suspension along with the concrete from the spray head.
6. A method of use for reducing the rebound composition of shotcrete as set forth in claim 5 wherein: the spray head is additionally provided with an atomization device and two feeding systems with metering functions.
7. A method of use for reducing the rebound composition of shotcrete as set forth in claim 5 wherein: the mass of the nano suspension containing the aromatic dispersing agent B is 0.5-2% of the mass of the concrete.
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