CN112047708B - Sprayed concrete and construction method thereof - Google Patents
Sprayed concrete and construction method thereof Download PDFInfo
- Publication number
- CN112047708B CN112047708B CN202010916438.XA CN202010916438A CN112047708B CN 112047708 B CN112047708 B CN 112047708B CN 202010916438 A CN202010916438 A CN 202010916438A CN 112047708 B CN112047708 B CN 112047708B
- Authority
- CN
- China
- Prior art keywords
- parts
- magnesium oxide
- powder
- treatment layer
- 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.)
- Active
Links
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
- C04B28/30—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 magnesium cements or similar cements
- C04B28/32—Magnesium oxychloride cements, e.g. Sorel cement
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D133/00—Coating compositions based on homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by only one carboxyl radical, or of salts, anhydrides, esters, amides, imides, or nitriles thereof; Coating compositions based on derivatives of such polymers
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
- C09D7/40—Additives
- C09D7/60—Additives non-macromolecular
- C09D7/61—Additives non-macromolecular inorganic
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
- C09D7/40—Additives
- C09D7/60—Additives non-macromolecular
- C09D7/63—Additives non-macromolecular organic
-
- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04G—SCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS
- E04G21/00—Preparing, conveying, or working-up building materials or building elements in situ; Other devices or measures for constructional work
- E04G21/02—Conveying or working-up concrete or similar masses able to be heaped or cast
- E04G21/04—Devices for both conveying and distributing
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/00034—Physico-chemical characteristics of the mixtures
- C04B2111/00146—Sprayable or pumpable mixtures
- C04B2111/00155—Sprayable, i.e. concrete-like, materials able to be shaped by spraying instead of by casting, e.g. gunite
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
- C04B2201/50—Mortars, concrete or artificial stone characterised by specific physical values for the mechanical strength
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/18—Oxygen-containing compounds, e.g. metal carbonyls
- C08K3/24—Acids; Salts thereof
- C08K3/26—Carbonates; Bicarbonates
- C08K2003/265—Calcium, strontium or barium carbonate
-
- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04G—SCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS
- E04G21/00—Preparing, conveying, or working-up building materials or building elements in situ; Other devices or measures for constructional work
- E04G21/02—Conveying or working-up concrete or similar masses able to be heaped or cast
- E04G21/04—Devices for both conveying and distributing
- E04G2021/049—Devices for both conveying and distributing concrete mixing nozzles specially adapted for conveying devices
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Life Sciences & Earth Sciences (AREA)
- Wood Science & Technology (AREA)
- Structural Engineering (AREA)
- Inorganic Chemistry (AREA)
- Ceramic Engineering (AREA)
- Architecture (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Mechanical Engineering (AREA)
- Civil Engineering (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
The invention relates to sprayed concrete which consists of a gelled material layer and an interface treatment layer, wherein the gelled material layer is formed by mixing the following components in parts by weight: 200-600 parts of carbon chromium slag, 100-200 parts of magnesium oxide, 100-200 parts of sodium hydrogen phosphate, 50-100 parts of lithium slag powder, 50-100 parts of steel slag powder, 10-50 parts of aluminum powder, 30-60 parts of water glass, 50-180 parts of ASA resin emulsion, 10-50 parts of a coagulation regulator, 400-800 parts of recycled aggregate and 100-200 parts of water; the interface treatment layer is formed by mixing the following components in parts by weight: 30-60 parts of acrylic emulsion, 20-40 parts of waterborne polyurethane, 10-30 parts of silane coupling agent, 5-20 parts of sodium metasilicate, 10-30 parts of limestone powder and 100-200 parts of water. The invention does not adopt traditional cement and traditional accelerator, is beneficial to environmental protection, and has good durability and low rebound rate.
Description
Technical Field
The invention belongs to the technical field of sprayed concrete, and particularly relates to sprayed concrete and a construction method thereof.
Background
The sprayed concrete is a quick construction material which is prepared by mixing stones, sand, water, admixture and admixture according to a preset mixing ratio by using a concrete spraying machine and taking compressed air as power and directly spraying the mixture to a surface to be sprayed through a hose or a pipeline. Compared with the pouring concrete, the sprayed concrete has the characteristics of quick final setting time, high early strength, convenient and flexible construction and the like, and is mainly applied to construction environments in which concrete is difficult to pour and form, such as tunnels, mines, underground projects, side slopes and the like. In recent years, along with the aging period of a large number of buildings in China, the large number of buildings need to be reformed, repaired and reinforced, the sprayed concrete has been more and more emphasized as a reinforced repairing material, and particularly in the aspect of military first-aid repair and rush construction, the sprayed concrete also has a very wide application prospect.
However, at present, the shotcrete for rush repair and rush construction is mainly prepared by adding an accelerating agent into common concrete, and the use of the accelerating agent shortens the setting time of the common concrete from several hours to several minutes, changes the whole hydration process of cement concrete, improves the porosity of the concrete, is not beneficial to the durability of the concrete, particularly the later strength of the concrete can be shrunk, and the durability of a reinforcing material in a reinforcing project is higher. And in order to ensure that the sprayed concrete has lower resilience (the resilience mainly refers to the resilience of the aggregate, water or the mixed concrete sprayed to a reinforced project in the concrete spraying process, and because the concrete cannot be timely condensed, the concrete which partially falls is the resilience of the sprayed concrete), the cement dosage is very high, and the cement dosage of each square of concrete reaches 450-480 kg, so that the cost and hydration heat release of the concrete are improved, and the durability of the concrete is not facilitated.
Magnesium phosphate cement is a new type of cementitious material that sets and hardens based on the acid-base reaction of magnesium oxide and phosphate. The material has the characteristics of high condensation speed, high early strength, good bonding property, small drying shrinkage, wear resistance, freezing resistance and the like. However, the setting time of the magnesium phosphate cement is too fast, the construction time is short, the retarder is usually added for production to be normally used, and the retarder is used for delaying the normal hydration process of the magnesium phosphate cement base material, so that the development of the later strength of the magnesium phosphate cement is not facilitated.
Disclosure of Invention
The invention aims to solve the problems of large cement consumption, poor durability and high rebound rate of common shotcrete and provide shotcrete.
Technical scheme
The sprayed concrete consists of a gelled material layer and an interface treatment layer, wherein the gelled material layer is formed by mixing the following components in parts by weight: 200-600 parts of carbon chromium slag, 100-200 parts of magnesium oxide, 100-200 parts of sodium hydrogen phosphate, 50-100 parts of lithium slag powder, 50-100 parts of steel slag powder, 10-50 parts of aluminum powder, 30-60 parts of water glass, 50-180 parts of ASA resin emulsion, 10-50 parts of a coagulation regulator, 400-800 parts of recycled aggregate and 100-200 parts of water;
the interface treatment layer is formed by mixing the following components in parts by weight: 30-60 parts of acrylic emulsion, 20-40 parts of waterborne polyurethane, 10-30 parts of silane coupling agent, 5-20 parts of sodium metasilicate, 10-30 parts of limestone powder and 100-200 parts of water;
fe in the steel slag powder2O3The content is more than 10 percent; al in lithium slag powder2O3The content is more than 20 percent; the viscosity of the acrylic emulsion is 3000-6000 mPa & s; the viscosity of the aqueous polyurethane is 50-200 Pa · s.
Further, the carbon chromium slag is subjected to high-temperature treatment at 700-1100 ℃ for 1-2 hours. The carbon-chromium slag contains more iron oxide and magnesium oxide and more heavy metal ions, and when the carbon-chromium slag is used in common concrete, the carbon-chromium slag has the risk of volume stability and the heavy metal ions are worried about dissolving out. The invention adopts the carbon chromium slag after high-temperature treatment, improves the activity of MgO in the carbon chromium slag through high-temperature treatment, forms struvite through the reaction of sodium hydrogen phosphate and MgO in the carbon chromium slag, and simultaneously consolidates heavy metal ions in the carbon chromium slag.
Further, the magnesium oxide is composed of light-burned magnesium oxide and heavy-burned magnesium oxide, and the mass ratio of the light-burned magnesium oxide to the heavy-burned magnesium oxide is 1: 3-3: 1.
Further, the ASA resin emulsion is obtained by adding 1.2 times of sodium acrylate, 1.8 times of ammonium sulfate, 0.6 times of triethanolamine and 1.3 times of bisacrylamide as ASA resin raw materials in the process of preparing the ASA resin by adopting an emulsion polymerization method for modification, wherein the ASA resin is a copolymer consisting of acrylonitrile, styrene and butyl acrylate, and the preparation of the ASA resin by adopting the emulsion polymerization method is a technique known in the art.
Further, the coagulation regulator is one or a combination of more than two of magnesium chloride, magnesium nitrate or magnesium sulfate in any proportion.
Further, the particle size of the recycled aggregate is less than 10mm, wherein the mass ratio of 0-5 mm to 5-10 mm is 2 (1-3). The space skeleton formed by matching the two combined recycled aggregates has the smallest gap, so that the used cementing material of the sprayed concrete is the smallest, and the prepared sprayed concrete is the most compact and has the highest strength.
Further, the silane coupling agent is preferably gamma-glycidoxypropyltrimethoxysilane. The silane coupling agent is matched with acrylic emulsion, waterborne polyurethane, sodium metasilicate and the like to form a film with strong film forming capability and strong permeability.
The construction method of the sprayed concrete comprises the following steps:
(1) weighing acrylic emulsion, waterborne polyurethane, a silane coupling agent, sodium metasilicate, limestone powder and water in parts by weight, uniformly stirring to obtain an interface treatment layer, and spraying the interface treatment layer on a working surface needing construction;
(2) weighing carbon chromium slag, magnesium oxide, sodium hydrogen phosphate, lithium slag powder, steel slag powder, aluminum powder, water glass, ASA resin emulsion, a coagulation regulator, recycled aggregate and water in parts by weight, uniformly stirring to obtain a cementing material layer, and spraying the cementing material layer onto the interface treatment layer after the spraying of the interface treatment layer in the step (1) is finished for 30-60 min.
The invention has the beneficial effects that:
1. the invention does not adopt traditional cement and traditional accelerating agent, but adopts the characteristic of rapid setting of magnesium phosphate cement, modifies raw materials (carbon chromium slag, magnesium oxide and phosphate), adopts mineral admixture (lithium slag powder, steel slag powder and aluminum powder) and the like, and utilizes Al with more mineral admixture phase2O3、Fe2O3To replace MgO during the reaction, to further improve the hydration product composition and to adjust it by means of a set control agent (magnesium chloride, magnesium nitrate and magnesium sulfate)Saving Mg in the system of the invention2+To adjust the setting time of the invention; the fluidity and the consistency of the sprayed concrete are changed by foaming the aluminum powder and using substances such as water glass, ASA resin emulsion and the like, so that the uniformity of the sprayed concrete is ensured. Meanwhile, the ASA resin emulsion can be subjected to polymerization reaction with acrylic emulsion, waterborne polyurethane, silane coupling agent and the like in the interface treatment layer, so that the bonding between the gel material layer and the interface treatment layer is increased, and the concrete rebound rate is reduced.
2. The invention sprays an interface treatment layer on the construction working face in advance, and the function of the invention is as follows: 1) the soil layer and other inner parts of the construction surface can be penetrated by the high permeability, and the inner part and the outer part of the soil layer form an organic whole; 2) the film forming capability is good, a layer of film can be formed on the surface of a soil layer of a construction surface, and loose soil bodies are prevented from falling; 3) the concrete has good cohesiveness, can cohere materials such as concrete and the like on a soil layer, and reduces the rebound rate of the concrete. The invention uses limestone powder as the filler of the interface treatment layer, and can improve the construction performance of the interface treatment layer.
Detailed Description
The technical solution of the present invention is further illustrated by the following specific examples.
In the following examples, Fe in the steel slag powder2O3The content is more than 10 percent; al in lithium slag powder2O3The content is more than 20 percent; the viscosity of the acrylic emulsion is 3000-6000 mPa & s; the viscosity of the waterborne polyurethane is 50-200 Pa.s; the ASA resin emulsion is obtained by adding 1.2 times of sodium acrylate, 1.8 times of ammonium sulfate, 0.6 times of triethanolamine and 1.3 times of bisacrylamide which are ASA resin raw materials in the process of preparing ASA resin by adopting an emulsion polymerization method for modification, wherein the ASA resin is a copolymer consisting of acrylonitrile, styrene and butyl acrylate.
Example 1
The sprayed concrete consists of a gelled material layer and an interface treatment layer, wherein the gelled material layer is formed by mixing the following components in parts by weight: 600 parts of carbon chromium slag (treated at the high temperature of 1100 ℃ for 1 hour), 200 parts of magnesium oxide, 200 parts of sodium hydrogen phosphate, 50 parts of lithium slag powder, 50 parts of steel slag powder, 10 parts of aluminum powder, 60 parts of water glass, 180 parts of ASA resin emulsion, 50 parts of a coagulation regulator (magnesium chloride), 800 parts of recycled aggregate and 200 parts of water;
the interface treatment layer is formed by mixing the following components in parts by weight: 30 parts of acrylic emulsion, 20 parts of waterborne polyurethane, 30 parts of a silane coupling agent (gamma-glycidyl ether oxypropyltrimethoxysilane), 20 parts of sodium metasilicate, 30 parts of limestone powder and 200 parts of water.
The magnesium oxide consists of light-burned magnesium oxide and heavy-burned magnesium oxide, and the mass ratio of the light-burned magnesium oxide to the heavy-burned magnesium oxide is 1: 3; the mass ratio of 0-5 mm to 5-10 mm in the recycled aggregate is 2: 3.
The construction method of the sprayed concrete comprises the following steps:
(1) weighing acrylic emulsion, waterborne polyurethane, a silane coupling agent, sodium metasilicate, limestone powder and water in parts by weight, uniformly stirring to obtain an interface treatment layer, and spraying the interface treatment layer on a working surface needing construction;
(2) weighing carbon chromium slag, magnesium oxide, sodium hydrogen phosphate, lithium slag powder, steel slag powder, aluminum powder, water glass, ASA resin emulsion, a coagulation regulator, recycled aggregate and water in parts by weight, uniformly stirring to obtain a cementing material layer, and spraying the cementing material layer onto the interface treatment layer after the spraying of the interface treatment layer in the step (1) is completed for 30 min.
Example 2
The sprayed concrete consists of a gelled material layer and an interface treatment layer, wherein the gelled material layer is formed by mixing the following components in parts by weight: 200 parts of carbon chromium slag (treated at the high temperature of 700 ℃ for 2 hours), 100 parts of magnesium oxide, 100 parts of sodium hydrogen phosphate, 50 parts of lithium slag powder, 50 parts of steel slag powder, 50 parts of aluminum powder, 30 parts of water glass, 50 parts of ASA resin emulsion, 10 parts of coagulation regulator (magnesium nitrate), 400 parts of recycled aggregate and 100 parts of water;
the interface treatment layer is formed by mixing the following components in parts by weight: 60 parts of acrylic emulsion, 40 parts of waterborne polyurethane, 10 parts of a silane coupling agent (gamma-glycidyl ether oxypropyltrimethoxysilane), 20 parts of sodium metasilicate, 30 parts of limestone powder and 100 parts of water.
The magnesium oxide consists of light-burned magnesium oxide and heavy-burned magnesium oxide, and the mass ratio of the light-burned magnesium oxide to the heavy-burned magnesium oxide is 3: 1; the mass ratio of 0-5 mm to 5-10 mm in the recycled aggregate is 1: 1.
The construction method of the sprayed concrete comprises the following steps:
(1) weighing acrylic emulsion, waterborne polyurethane, a silane coupling agent, sodium metasilicate, limestone powder and water in parts by weight, uniformly stirring to obtain an interface treatment layer, and spraying the interface treatment layer on a working surface needing construction;
(2) weighing carbon chromium slag, magnesium oxide, sodium hydrogen phosphate, lithium slag powder, steel slag powder, aluminum powder, water glass, ASA resin emulsion, a coagulation regulator, recycled aggregate and water in parts by weight, uniformly stirring to obtain a cementing material layer, and spraying the cementing material layer onto the interface treatment layer after the spraying of the interface treatment layer in the step (1) is finished for 60 min.
Example 3
The sprayed concrete consists of a gelled material layer and an interface treatment layer, wherein the gelled material layer is formed by mixing the following components in parts by weight: 400 parts of carbon chromium slag (treated at the high temperature of 1000 ℃ for 1.5h), 150 parts of magnesium oxide, 150 parts of sodium hydrogen phosphate, 70 parts of lithium slag powder, 80 parts of steel slag powder, 40 parts of aluminum powder, 50 parts of water glass, 100 parts of ASA resin emulsion, 40 parts of a coagulation regulator (magnesium sulfate), 600 parts of recycled aggregate and 200 parts of water;
the interface treatment layer is formed by mixing the following components in parts by weight: 50 parts of acrylic emulsion, 30 parts of waterborne polyurethane, 20 parts of a silane coupling agent (gamma-glycidyl ether oxypropyltrimethoxysilane), 15 parts of sodium metasilicate, 20 parts of limestone powder and 150 parts of water.
The magnesium oxide consists of light-burned magnesium oxide and heavy-burned magnesium oxide, and the mass ratio of the light-burned magnesium oxide to the heavy-burned magnesium oxide is 2: 1; the mass ratio of 0-5 mm to 5-10 mm in the recycled aggregate is 2: 1.
The construction method of the sprayed concrete comprises the following steps:
(1) weighing acrylic emulsion, waterborne polyurethane, a silane coupling agent, sodium metasilicate, limestone powder and water in parts by weight, uniformly stirring to obtain an interface treatment layer, and spraying the interface treatment layer on a working surface needing construction;
(2) weighing carbon chromium slag, magnesium oxide, sodium hydrogen phosphate, lithium slag powder, steel slag powder, aluminum powder, water glass, ASA resin emulsion, a coagulation regulator, recycled aggregate and water in parts by weight, uniformly stirring to obtain a cementing material layer, and spraying the cementing material layer onto the interface treatment layer after the spraying of the interface treatment layer in the step (1) is completed for 50 min.
Example 4
The sprayed concrete consists of a gelled material layer and an interface treatment layer, wherein the gelled material layer is formed by mixing the following components in parts by weight: 600 parts of carbon chromium slag (treated at the high temperature of 1000 ℃ for 1 hour), 150 parts of magnesium oxide, 200 parts of sodium hydrogen phosphate, 60 parts of lithium slag powder, 70 parts of steel slag powder, 20 parts of aluminum powder, 40 parts of water glass, 50 parts of ASA resin emulsion, 30 parts of a coagulation regulator (composed of magnesium chloride, magnesium nitrate and magnesium sulfate in a weight ratio of 1:1: 1), 400 parts of recycled aggregate and 150 parts of water;
the interface treatment layer is formed by mixing the following components in parts by weight: 30 parts of acrylic emulsion, 20 parts of waterborne polyurethane, 30 parts of a silane coupling agent (gamma-glycidyl ether oxypropyltrimethoxysilane), 20 parts of sodium metasilicate, 30 parts of limestone powder and 200 parts of water.
The magnesium oxide consists of light-burned magnesium oxide and heavy-burned magnesium oxide, and the mass ratio of the light-burned magnesium oxide to the heavy-burned magnesium oxide is 2: 1; the mass ratio of 0-5 mm to 5-10 mm in the recycled aggregate is 1: 1.
The construction method of the sprayed concrete comprises the following steps:
(1) weighing acrylic emulsion, waterborne polyurethane, a silane coupling agent, sodium metasilicate, limestone powder and water in parts by weight, uniformly stirring to obtain an interface treatment layer, and spraying the interface treatment layer on a working surface needing construction;
(2) weighing carbon chromium slag, magnesium oxide, sodium hydrogen phosphate, lithium slag powder, steel slag powder, aluminum powder, water glass, ASA resin emulsion, a coagulation regulator, recycled aggregate and water in parts by weight, uniformly stirring to obtain a cementing material layer, and spraying the cementing material layer onto the interface treatment layer after the spraying of the interface treatment layer in the step (1) is finished for 60 min.
Comparative example
The mixing ratio of a certain commercial shotcrete is as follows: 52.5 parts of cement 450 parts, silica fume 45 parts, medium sand 800 parts, stones 700, cellulose ether thickening agent 10 parts, calcium sulphoaluminate accelerating agent 10 parts, polyvinyl alcohol fiber 20 parts, polycarboxylic acid water reducing agent 5 parts and water 180 parts.
The mechanical properties and durability of the shotcretes of examples 1 to 4 and comparative examples were tested according to the general concrete mechanical test method (GB/T50081-2002) and the general concrete long-term performance and durability test method Standard (GB/T50082-2009). The test results are shown in table 1:
TABLE 1
From the test results in Table 1, it can be found that the shotcretes of examples 1 to 4 of the present invention have lower rebound and much higher durability than the conventional shotcrete for the market.
The technical means disclosed in the invention scheme are not limited to the technical means disclosed in the above embodiments, but also include the technical scheme formed by any combination of the above technical features. It should be noted that those skilled in the art can make various improvements and modifications without departing from the principle of the present invention, and such improvements and modifications are also considered to be within the scope of the present invention.
Claims (6)
1. The sprayed concrete is characterized by consisting of a gelled material layer and an interface treatment layer, wherein the gelled material layer is formed by mixing the following components in parts by weight: 200-600 parts of carbon chromium slag, 100-200 parts of magnesium oxide, 100-200 parts of sodium hydrogen phosphate, 50-100 parts of lithium slag powder, 50-100 parts of steel slag powder, 10-50 parts of aluminum powder, 30-60 parts of water glass, 50-180 parts of ASA resin emulsion, 10-50 parts of a coagulation regulator, 400-800 parts of recycled aggregate and 100-200 parts of water;
the interface treatment layer is formed by mixing the following components in parts by weight: 30-60 parts of acrylic emulsion, 20-40 parts of waterborne polyurethane, 10-30 parts of silane coupling agent, 5-20 parts of sodium metasilicate, 10-30 parts of limestone powder and 100-200 parts of water;
fe in the steel slag powder2O3The content is more than 10 percent; al in lithium slag powder2O3The content is more than 20 percent; the viscosity of the acrylic emulsion is 3000-6000 mPa.s; the viscosity of the waterborne polyurethane is 50-200 Pa.s;
the carbon chromium slag is treated at the high temperature of 700-1100 ℃ for 1-2 hours;
the pour point regulator is one or a combination of two of magnesium nitrate and magnesium sulfate in any proportion.
2. The shotcrete of claim 1, wherein the magnesium oxide is composed of light-burned magnesium oxide and heavy-burned magnesium oxide, and a mass ratio of the light-burned magnesium oxide to the heavy-burned magnesium oxide is 1:3 to 3: 1.
3. The shotcrete as claimed in claim 1, wherein the ASA resin emulsion is modified by adding 1.2 times of sodium acrylate, 1.8 times of amine sulfate, 0.6 times of triethanolamine and 1.3 times of bisacrylamide as ASA resin raw materials in the preparation of ASA resin by emulsion polymerization, wherein the ASA resin is a copolymer of acrylonitrile, styrene and butyl acrylate.
4. The shotcrete according to claim 1, wherein the recycled aggregate has a particle size of less than 10mm, and a mass ratio of the recycled aggregate having a particle size of less than 5mm to the recycled aggregate having a particle size of 5 to 10mm is 2 (1 to 3).
5. The shotcrete of any one of claims 1 to 4, wherein the silane coupling agent is γ -glycidoxypropyltrimethoxysilane.
6. The shotcrete construction method according to any one of claims 1 to 5, comprising the steps of:
(1) weighing acrylic emulsion, waterborne polyurethane, a silane coupling agent, sodium metasilicate, limestone powder and water in parts by weight, uniformly stirring to obtain an interface treatment layer, and spraying the interface treatment layer on a working surface needing construction;
(2) weighing carbon chromium slag, magnesium oxide, sodium hydrogen phosphate, lithium slag powder, steel slag powder, aluminum powder, water glass, ASA resin emulsion, a coagulation regulator, recycled aggregate and water in parts by weight, uniformly stirring to obtain a cementing material layer, and spraying the cementing material layer onto the interface treatment layer after the spraying of the interface treatment layer in the step (1) is finished for 30-60 min.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010916438.XA CN112047708B (en) | 2020-09-03 | 2020-09-03 | Sprayed concrete and construction method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010916438.XA CN112047708B (en) | 2020-09-03 | 2020-09-03 | Sprayed concrete and construction method thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN112047708A CN112047708A (en) | 2020-12-08 |
| CN112047708B true CN112047708B (en) | 2021-05-07 |
Family
ID=73607790
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010916438.XA Active CN112047708B (en) | 2020-09-03 | 2020-09-03 | Sprayed concrete and construction method thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN112047708B (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113880547B (en) * | 2021-10-11 | 2022-07-01 | 淮安市博彦土木工程科学研究院有限公司 | Sprayed concrete for foundation pit slope and construction method thereof |
| CN115353351B (en) * | 2022-08-29 | 2023-04-14 | 新疆科能新材料技术股份有限公司 | Thin-spraying high-performance polymer mortar for tunnel rock protection |
| CN117025059B (en) * | 2023-08-17 | 2024-03-12 | 安徽工业大学 | Solid waste base wear-resistant epoxy floor coating and preparation method thereof |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102643058A (en) * | 2012-04-19 | 2012-08-22 | 招商局重庆交通科研设计院有限公司 | New/old cement concrete interfacial binding agent and construction method for interfacial binding by using same |
| JP2016130206A (en) * | 2015-01-15 | 2016-07-21 | デンカ株式会社 | Spray cement mortar and spray cement concrete |
| CN108911648A (en) * | 2018-07-02 | 2018-11-30 | 江苏苏博特新材料股份有限公司 | A kind of sprayable early-strength superhigh tenacity mortar concrete system and preparation method thereof |
| CN109020391A (en) * | 2018-09-05 | 2018-12-18 | 东南大学 | A kind of gunite concrete and preparation method thereof |
| CN109694231A (en) * | 2019-02-22 | 2019-04-30 | 山东创能机械科技有限公司 | A kind of phosphorus magnesia-based cements gunite material and its preparation method and application |
-
2020
- 2020-09-03 CN CN202010916438.XA patent/CN112047708B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102643058A (en) * | 2012-04-19 | 2012-08-22 | 招商局重庆交通科研设计院有限公司 | New/old cement concrete interfacial binding agent and construction method for interfacial binding by using same |
| JP2016130206A (en) * | 2015-01-15 | 2016-07-21 | デンカ株式会社 | Spray cement mortar and spray cement concrete |
| CN108911648A (en) * | 2018-07-02 | 2018-11-30 | 江苏苏博特新材料股份有限公司 | A kind of sprayable early-strength superhigh tenacity mortar concrete system and preparation method thereof |
| CN109020391A (en) * | 2018-09-05 | 2018-12-18 | 东南大学 | A kind of gunite concrete and preparation method thereof |
| CN109694231A (en) * | 2019-02-22 | 2019-04-30 | 山东创能机械科技有限公司 | A kind of phosphorus magnesia-based cements gunite material and its preparation method and application |
Also Published As
| Publication number | Publication date |
|---|---|
| CN112047708A (en) | 2020-12-08 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN112047708B (en) | Sprayed concrete and construction method thereof | |
| CN109293301B (en) | Anti-freezing concrete | |
| KR101809485B1 (en) | Ultra rapid harding,high early strength waterproof and mothproof mortar composition | |
| CN112047666B (en) | Alkali-activated blast furnace ferronickel slag sprayed concrete | |
| CN111606612B (en) | Alkali-activated cementitious materials and methods of use thereof | |
| CN108328977B (en) | Concrete repairing material | |
| WO2021175004A1 (en) | Concrete admixture anti-seepage and anti-cracking shrinkage-reducing agent and preparation method thereof | |
| CN112777960A (en) | High-durability liquid alkali-free accelerator and preparation method thereof | |
| CN111003966B (en) | Sulfate-resistant low-alkali portland cement reinforcing agent and application thereof | |
| CN111234711B (en) | High-durability inorganic bar planting adhesive and preparation method thereof | |
| CN116835949A (en) | High-doping-amount and high-strength electrolytic manganese slag-based environment-friendly baking-free brick and preparation method thereof | |
| CN113321464B (en) | Anti-corrosion waterproof cement-based grouting material and preparation method thereof | |
| CN113603433B (en) | Shale-doped sleeve grouting material for connecting cement-based steel bars | |
| CN113651590B (en) | Building leakage-stopping composite material and using method thereof | |
| CN114105502B (en) | Cementing material, historic building repair mortar and preparation method thereof | |
| CN111732381A (en) | Preparation method of phosphorus slag powder concrete | |
| CN115073054A (en) | High-strength ultrafine additive for shotcrete, preparation method and use method thereof, low-resilience shotcrete and preparation method thereof | |
| CN106747639A (en) | A kind of foamed concrete thermal-insulating material | |
| CN113149562A (en) | Polymer cement-based high-performance grouting material and preparation method thereof | |
| CN113121191A (en) | Rapid repairing adhesive and preparation method and application method thereof | |
| CN110615642A (en) | Concrete containing high-activity slag powder and preparation method thereof | |
| CN109574598A (en) | A kind of preparation process of environment-friendlydurable durable construction material | |
| CN109574599A (en) | A kind of environment-friendlydurable durable construction material | |
| CN110563379B (en) | Accelerating agent suitable for sprayed concrete and preparation method thereof | |
| CN115572146B (en) | Alkali-activated granite powder cementing 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 | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |