CN109694231B - Phosphorus-magnesium-based cement guniting material and preparation method and application thereof - Google Patents
Phosphorus-magnesium-based cement guniting material and preparation method and application thereof Download PDFInfo
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- CN109694231B CN109694231B CN201910133678.XA CN201910133678A CN109694231B CN 109694231 B CN109694231 B CN 109694231B CN 201910133678 A CN201910133678 A CN 201910133678A CN 109694231 B CN109694231 B CN 109694231B
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- 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
- C04B28/34—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 cold phosphate binders
- C04B28/344—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 cold phosphate binders the phosphate binder being present in the starting composition solely as one or more phosphates
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- 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
- C04B28/34—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 cold phosphate binders
- C04B28/346—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 cold phosphate binders the phosphate binder being present in the starting composition as a mixture of free acid and one or more phosphates
- C04B28/348—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 cold phosphate binders the phosphate binder being present in the starting composition as a mixture of free acid and one or more phosphates the starting mixture also containing one or more reactive oxides
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- 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
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- 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
- C04B2111/00474—Uses not provided for elsewhere in C04B2111/00
- C04B2111/00724—Uses not provided for elsewhere in C04B2111/00 in mining operations, e.g. for backfilling; in making tunnels or galleries
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- 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
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Abstract
The invention provides a phosphorus-magnesium-based cement guniting material as well as a preparation method and application thereof, belonging to the technical application field of guniting materials. The guniting material is prepared from the following materials, by weight, 40-70 parts of a composite magnesium compound, 0.5-3 parts of a composite retarder, 0.3-0.8 part of a water reducing agent, 10-40 parts of phosphate, 0.5-1.5 parts of a tackifier and 0.3-0.7 part of fiber. Weighing the guniting material according to a proportion, blending the guniting material with sand according to a proportion of 1:3, wherein the sand is medium sand or coarse sand: and (3) mixing fine sand with 4:1 mixed sand, mixing the guniting material with the sand, mixing the mixture with water according to the ratio of 100: 15-30, stirring the mixture into slurry, and uniformly mixing the slurry to obtain the sand-based guniting mortar. The phosphorus-magnesium-based cement guniting material has the advantages of high early strength, high compression strength and breaking strength, low rebound rate, good cohesiveness, no dust pollution, high support strength, good workability and impermeability, low cost, convenience and simplicity in construction, greenness, environmental friendliness and the like.
Description
Technical Field
The invention belongs to the technical application field of guniting materials, and particularly relates to a phosphorus-magnesium-based cement guniting material as well as a preparation method and application thereof.
Background
With the frequency of disasters such as landslide, debris flow, roadway collapse, rock fall, local collapse and the like in recent years, pre-disaster prevention and post-disaster rapid repair problems are receiving more attention. The best method for solving the problem is undoubtedly to carry out slope repair, surrounding rock support, roadway repair and reinforcement, leakage stoppage and rapid road repair and reinforcement by using the shotcrete technology. Shotcrete is a type of concrete with quick setting properties used to reinforce and protect the surface of structures or rocks.
At present, the commonly adopted high-strength anchor-shotcrete support process plays an important role in coal mine production in China, but with the increase of mining depth, the strength and the integrity of surrounding rocks of a roadway are gradually reduced, the stability is reduced, the requirement of support follow-up tunneling is enhanced, higher requirements are provided for anchor-shotcrete support, and the problems existing in the existing shotcrete support are as follows:
1. the sprayed layer is cracked because the sprayed layer material is lack of toughness, thereby causing cracking, bursting or integral falling.
2. The problem of spray delamination is caused by the low adhesion of the material to the interface.
3. The rebound rate of the guniting material is as high as 35-40%, the cohesiveness is poor, a large amount of ground materials are wasted, the mortar is slowly coagulated, and the supporting effect is slowly exerted.
4. The dust concentration is large, the underground air and the operation environment are seriously polluted, the safe production is influenced, and the physical and psychological health of workers is harmed.
5. The material has single ingredient and performance, more rigid components in the components, large rigidity and brittleness, insufficient flexibility and poor compactness, and is easy to crack and fall off in the traditional guniting material, thereby causing the hidden troubles of water leakage, gas overflow, mortar collapse and the like.
6. The guniting process is difficult to control, the mixing ratio of mixing and blending on site is difficult to control, the operation randomness of workers is high, and the quality control difficulty is high.
The problems existing in the guniting process need to be solved urgently, so that the roadway support effect can be ensured, and the long-term stability of the roadway is kept. Meanwhile, the problems of low supporting speed, long supporting time and rebound and dust in guniting support can be solved.
Chinese patent CN100591502 discloses a dry-mixed guniting material for underground coal mine roadways and a preparation method thereof, which are prepared by mixing and stirring cement, quartz sand or stone powder, calcium carbonate, cellulose, fibers and the like into a guniting material, and have the advantages of light weight, high strength, high bonding force and convenient construction, but the cost is high, the field adjustability is poor, the current engineering requirements are difficult to meet, and the dry-mixed guniting material is difficult to widely apply.
Chinese patent CN105110718B discloses a dry-mixed guniting material for underground anchor net support with high-content fly ash and coal gangue, which is composed of pollutant fly ash, coal gangue, slag powder and waste micro-silica powder, cement, silica, naphthalene water reducer and polypropylene fiber, and has the advantages of ensuring the durability and long-term property of a concrete spraying layer, improving the bonding strength and solving the problems of resource waste and environmental pollution.
Chinese patent CN103708782A discloses a concrete guniting material, which is composed of cement, sand, pebbles, polymer, fly ash, silica powder, high efficiency water reducing agent and accelerating agent, wherein the polymer and other additives are added into the guniting material, and the guniting material still keeps a better suspension state in pipeline transportation through dry mixing materials, so that the components of the guniting material are basically ensured not to be separated, and the proportion of guniting materials is ensured. However, the products have poor deep layer expansion capability and poor permeability, and need to be constructed for many times during site construction, which wastes labor and time.
Therefore, the novel guniting material which overcomes the defects of poor toughness, poor cohesiveness, high rebound rate, more ground materials, easy cracking, large dust and no functions of preventing seepage and gas leakage of the traditional guniting material is developed, and plays a very important role in improving the safety production of coal mines and tunnels and preventing and reconstructing mountain disasters.
Disclosure of Invention
Aiming at the defects in the prior art, the invention provides the phosphorus-magnesium-based cement guniting material and the preparation method and the application thereof, the phosphorus-magnesium-based cement guniting material prepared by the invention has the advantages of high early strength, high compression strength and breaking strength, low rebound rate, good cohesiveness, no dust pollution, high support strength, good workability and impermeability and the like, can be widely applied to side slope maintenance, surrounding rock support, roadway repair and reinforcement, leakage stoppage and rapid road repair, and is low in cost, convenient and simple to construct, green and environment-friendly.
The invention aims to provide a phosphorus-magnesium-based cement guniting material.
The other object of the present invention is to provide a method for preparing the above-mentioned phosphomagnesium-based cement guniting material.
The invention also aims to provide application of the magnesium phosphate-based cement guniting material.
In order to achieve the purpose, the invention relates to the following technical scheme:
the invention provides a phosphorus-magnesium-based cement guniting material, which is prepared from the following materials in parts by weight: 40-70 parts of composite magnesium compound, 0.5-3 parts of composite retarder, 0.3-0.8 part of water reducing agent, 10-40 parts of phosphate, 0.5-1.5 parts of tackifier and 0.3-0.7 part of fiber.
Preferably, the composite magnesium compound is a mixture of magnesium oxide and at least one of magnesium hydroxide and magnesium phosphate.
Preferably, the compound retarder is at least two of urea, boric acid, borax, triethanolamine and sodium tripolyphosphate.
Preferably, the water reducing agent is at least one of a lignosulfonate water reducing agent, a sulfamate water reducing agent, a polycarboxylic acid water reducing agent and a naphthalene water reducing agent.
Preferably, the phosphate is: at least one of diammonium hydrogen phosphate, ammonium dihydrogen phosphate, dipotassium hydrogen phosphate and potassium dihydrogen phosphate.
Preferably, the viscosity increasing agent is at least one of cellulose ether, attapulgite, guar gum, xanthan gum, polyurethane and polyacrylamide.
Preferably, the fiber is at least one of glass fiber and polypropylene fiber, and the length of the fiber is 10-30 mm.
Preferably, the phosphorus-magnesium-based cement guniting material is prepared from the following materials in parts by weight: 55 parts of magnesium oxide, 15 parts of magnesium hydroxide, 1.5 parts of borax, 0.5 part of a naphthalene water reducing agent, 10 parts of diammonium hydrogen phosphate, 0.5 part of polyurethane and 0.7 part of glass fiber;
preferably, the phosphorus-magnesium-based cement guniting material is prepared from the following materials in parts by weight: 20 parts of magnesium phosphate, 20 parts of magnesium oxide, 1 part of boric acid, 0.3 part of a polycarboxylic acid water reducing agent, 40 parts of monopotassium phosphate, 0.8 part of cellulose ether and 0.3 part of polypropylene fiber;
preferably, the phosphorus-magnesium-based cement guniting material is prepared from the following materials in parts by weight: 25 parts of magnesium oxide, 30 parts of magnesium hydroxide, 3 parts of sodium tripolyphosphate, 0.8 part of sulfamate water reducing agent, 30 parts of ammonium dihydrogen phosphate, 1.5 parts of guar gum and 0.5 part of glass fiber.
In a second aspect of the present invention, there is provided a method for preparing the aforementioned phosphomagnesium-based cement gunite material, comprising:
s1, preparing a guniting material: weighing each raw material of the magnesium phosphate-based cement guniting material according to the proportion, and uniformly stirring for later use;
s2, blending with sand: mixing the guniting material uniformly mixed in the step S1 with sand according to the ratio of 1: 1-3;
s3, mixing with water: and mixing the guniting material with sand, mixing with water according to the mass ratio of 100: 15-30, stirring to form slurry, and carrying out guniting operation after uniformly mixing.
Preferably, in step S2, the sand is medium sand or coarse sand: the fine sand is mixed sand with a ratio of 4: 1.
The third aspect of the invention provides the application of the phosphorus-magnesium-based cement guniting material in slope repair, surrounding rock support, roadway repair and reinforcement, leakage stoppage and rapid road first-aid repair.
The invention has the beneficial effects that:
1. the early strength is high, the compressive strength and the breaking strength are high, the 28d compressive strength reaches more than 25MPa, and the characteristics of quick hardening and curing and short final setting time are achieved;
2. the adhesive force is strong, the rebound rate is low, the cohesiveness is good, the supporting strength is high, the utilization rate of the guniting material is improved, the waste of a large amount of ground materials is avoided, no dust pollution is caused, the rebound rate is reduced to 4% -8% from 35-40% of common concrete, the guniting material is saved, and the benefit is improved;
3. the storage stability is good, the basic properties of the material are not changed after the material is stored for a long time under normal temperature and pressure, the material is not influenced by temperature and humidity changes, the storage period is long, the material is green and environment-friendly, the construction process is simple, the used raw materials can be purchased from the market, the processing treatment is not needed, the cost is low, the material is green and environment-friendly, the use condition is wide, and the popularization and the application are more facilitated;
4. the invention mainly solves the problems through the following aspects, and meets the engineering requirements:
(1) magnesium compounds such as magnesium hydroxide, magnesium phosphate and the like are introduced to be used together with magnesium oxide, so that the performance deficiency of single magnesium oxide in the traditional formula is made up, the early strength is improved, the hydration heat release is adjusted, and the normal use in severe cold areas is met;
(2) the tackifier is used for increasing the viscosity, improving the cohesiveness and cohesion of the guniting material and reducing the rebound rate;
(3) the water reducing agent is viscous after meeting water, so that the use fault tolerance of product slurry is improved, and the actual problem of performance reduction caused by large operation error in field construction is solved;
(4) glass fiber and polypropylene fiber are used, so that the bending resistance of the material is improved;
(5) the invention has simple preparation method, high plugging efficiency, strong practicability and easy popularization.
Detailed Description
It should be noted that the following detailed description is exemplary and is intended to provide further explanation of the disclosure. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments according to the present application. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof, unless the context clearly indicates otherwise.
As mentioned above, the traditional guniting material generally has the defects of poor toughness, poor cohesiveness, high rebound rate, more ground materials, easy cracking, large dust, no functions of preventing water leakage and gas leakage and the like.
In view of the above, one embodiment of the present invention provides a phosphorus-magnesium based cement guniting material, which is prepared from the following materials in parts by weight: 40-70 parts of composite magnesium compound, 0.5-3 parts of composite retarder, 0.3-0.8 part of water reducing agent, 10-40 parts of phosphate, 0.5-1.5 parts of tackifier and 0.3-0.7 part of fiber.
In another embodiment of the present invention, the composite magnesium compound is a mixture of magnesium oxide and at least one of magnesium hydroxide and magnesium phosphate; magnesium compounds such as magnesium hydroxide, magnesium phosphate and the like are introduced to be used together with magnesium oxide, so that the performance deficiency of single magnesium oxide in the traditional formula is made up, the early strength is improved, the hydration heat release is adjusted, and the normal use in severe cold areas is met;
in another embodiment of the present invention, the compound retarder is at least two of urea, boric acid, borax, triethanolamine and sodium tripolyphosphate.
In another embodiment of the present invention, the water reducing agent is at least one of a lignosulfonate water reducing agent, a sulfamate water reducing agent, a polycarboxylic acid water reducing agent and a naphthalene water reducing agent; therefore, the use fault-tolerant rate of the product slurry can be improved, and the actual problem of performance reduction caused by large operation error of field construction is solved.
In yet another embodiment of the present invention, the phosphate is: at least one of diammonium hydrogen phosphate, ammonium dihydrogen phosphate, dipotassium hydrogen phosphate and potassium dihydrogen phosphate.
In another embodiment of the present invention, the viscosity increasing agent is at least one of cellulose ether, attapulgite, guar gum, xanthan gum, polyurethane and polyacrylamide, and by using the above viscosity increasing agent, the viscosity can be increased, the cohesiveness and cohesion of the guniting material can be improved, and the rebound resilience can be reduced;
in another embodiment of the present invention, the fiber is at least one of glass fiber and polypropylene fiber, and the length is 10 to 30 mm; thereby effectively increasing the bending resistance of the material;
in another embodiment of the present invention, the phosphorus-magnesium based cement guniting material is prepared from the following materials in parts by weight: 55 parts of magnesium oxide, 15 parts of magnesium hydroxide, 1.5 parts of borax, 0.5 part of a naphthalene water reducing agent, 10 parts of diammonium hydrogen phosphate, 0.5 part of polyurethane and 0.7 part of glass fiber;
in another embodiment of the present invention, the phosphorus-magnesium based cement guniting material is prepared from the following materials in parts by weight: 20 parts of magnesium phosphate, 20 parts of magnesium oxide, 1 part of boric acid, 0.3 part of a polycarboxylic acid water reducing agent, 40 parts of monopotassium phosphate, 0.8 part of cellulose ether and 0.3 part of polypropylene fiber;
in another embodiment of the present invention, the phosphorus-magnesium based cement guniting material is prepared from the following materials in parts by weight: 25 parts of magnesium oxide, 30 parts of magnesium hydroxide, 3 parts of sodium tripolyphosphate, 0.8 part of sulfamate water reducing agent, 30 parts of ammonium dihydrogen phosphate, 1.5 parts of guar gum and 0.5 part of glass fiber.
In another embodiment of the present invention, there is provided a method for preparing the aforementioned phosphomagnesium-based cement gunite material, comprising:
s1, preparing a guniting material: weighing each raw material of the magnesium phosphate-based cement guniting material according to the proportion, and uniformly stirring for later use;
s2, blending with sand: mixing the guniting material uniformly mixed in the step S1 with sand according to the ratio of 1: 1-3;
s3, mixing with water: and mixing the guniting material with sand, mixing with water according to the mass ratio of 100: 15-30, stirring to form slurry, and carrying out guniting operation after uniformly mixing.
In another embodiment of the present invention, in the step S2, the sand is medium sand or coarse sand: the fine sand is mixed sand with a ratio of 4: 1.
In another embodiment of the invention, the phosphorus-magnesium-based cement guniting material is applied to slope repair, surrounding rock support, roadway repair and reinforcement, leakage stoppage and rapid road first-aid repair.
The invention is further illustrated by the following examples, which are not to be construed as limiting the invention thereto. It should be understood that these examples are for illustrative purposes only and are not intended to limit the scope of the present invention. The test methods in the following examples, which are not specified under specific conditions, are generally carried out under conventional conditions. Wherein, the fineness modulus of the coarse sand is 3.7-3.1, and the average grain diameter is more than 0.5 mm; the fineness modulus of the medium sand is 3.0-2.3, and the average grain diameter is 0.5-0.35 mm; the fineness modulus of the fine sand is 2.2-1.6, and the average grain diameter is 0.35-0.25 mm.
Example 1
(1) Preparing a guniting material: accurately weighing 55 parts of magnesium oxide, 15 parts of magnesium hydroxide, 1.5 parts of borax, 0.5 part of sodium tripolyphosphate, 0.5 part of a naphthalene water reducing agent, 10 parts of diammonium hydrogen phosphate, 0.5 part of polyurethane and 0.7 part of glass fiber, and uniformly stirring for later use;
(2) mixing with sand: mixing the guniting material with sand according to the proportion of 1:3, wherein the sand is coarse sand: the fine sand is mixed sand with the ratio of 4: 1;
(3) mixing with water: mixing the guniting material with sand, mixing with water according to the ratio of 100:15, stirring to form slurry, and carrying out guniting operation after uniformly mixing.
Determination of spray rebound rate of guniting material: adding water to adjust mortar slump to 8-10cm, placing a plastic cloth with thickness of 8mm under the guniting wall face and close to rock stratum foundation, and making the area be not less than 5m2And ejecting the concrete from the rock-receiving surface.
Through field inspection, the dust content in the construction process is reduced, and the rebound rate is reduced to 3% -7% from 30% of the traditional guniting material; the dead weight of the novel guniting material is greatly reduced by 30-40% compared with that of the traditional guniting material; the adhesion is greatly improved.
Example 2
(1) Preparing a guniting material: accurately weighing 20 parts of magnesium phosphate, 20 parts of magnesium oxide, 1 part of boric acid, 1 part of borax, 0.3 part of a polycarboxylic acid water reducing agent, 40 parts of monopotassium phosphate, 0.8 part of cellulose ether and 0.3 part of polypropylene fiber, and uniformly stirring for later use;
(2) mixing with sand: mixing the guniting material with sand according to the proportion of 1:1, wherein the sand is medium sand;
(3) mixing with water: mixing the guniting material with sand, mixing with water according to the ratio of 100:30, stirring to form slurry, and carrying out guniting operation after uniformly mixing.
Determination of spray rebound rate of guniting material: adding water to adjust mortar slump to 8-10cm, placing a plastic cloth with thickness of 8mm under the guniting wall face and close to rock stratum foundation, and making the area be not less than 5m2And ejecting the concrete from the rock-receiving surface.
Through on-site inspection, the dust content in the construction process is reduced, and the rebound rate is reduced to 3.5% -9% from 35% of the traditional guniting material; the dead weight of the novel guniting material is greatly reduced by 33-42% compared with that of the traditional guniting material; the adhesion is greatly improved.
Example 3
(1) Preparing a guniting material: accurately weighing 25 parts of magnesium oxide, 30 parts of magnesium hydroxide, 1 part of triethanolamine, 2 parts of sodium tripolyphosphate, 0.8 part of sulfamate water reducing agent, 30 parts of ammonium dihydrogen phosphate, 1.5 parts of guar gum and 0.5 part of glass fiber, and uniformly stirring for later use;
(2) mixing with sand: mixing the guniting material with sand according to the proportion of 1:2, wherein the sand is medium sand;
(3) mixing with water: mixing the guniting material with sand, mixing with water according to the ratio of 100:25, stirring to form slurry, and carrying out guniting operation after uniformly mixing.
Determination of spray rebound rate of guniting material: adding water to adjust mortar slump to 8-10cm, placing a plastic cloth with thickness of 8mm under the guniting wall face and close to rock stratum foundation, and making the area be not less than 5m2And ejecting the concrete from the rock-receiving surface.
Through field inspection, the dust content in the construction process is reduced, and the rebound rate is reduced to 2-6% from 40% of the traditional guniting material; the dead weight of the novel guniting material is greatly reduced by 28-36% compared with that of the traditional guniting material; the adhesion is greatly improved.
Experimental example 1
(1) Preparing a guniting material: accurately weighing 60 parts of magnesium phosphate, 20 parts of magnesium hydroxide, 2 parts of borax, 0.5 part of a naphthalene water reducing agent, 10 parts of diammonium hydrogen phosphate, 0.5 part of polyurethane and 0.7 part of glass fiber, and uniformly stirring for later use;
(2) mixing with sand: mixing the guniting material with sand according to the proportion of 1:3, wherein the sand is coarse sand: the fine sand is mixed sand with the ratio of 4: 1;
(3) mixing with water: mixing the guniting material with sand, mixing with water according to the ratio of 100:15, stirring to form slurry, and carrying out guniting operation after uniformly mixing.
Determination of spray rebound rate of guniting material: adding water to adjust the slump of the mortar to be between 8 and 10cm, and sprayingA piece of plastic cloth with the thickness of 8mm is arranged under the grout wall surface and close to the rock stratum foundation, and the area is not less than 5m2And ejecting the concrete from the rock-receiving surface.
Through on-site inspection, the dust content in the construction process is reduced, and the rebound rate is reduced to 18-24% from 30% of the traditional guniting material; the dead weight of the novel guniting material is reduced by 15-25% compared with that of the traditional guniting material; the adhesion is improved.
Experimental example 2
(1) Preparing a guniting material: accurately weighing 10 parts of magnesium carbonate, 20 parts of magnesium oxide, 1 part of boric acid, 1 part of borax, 0.3 part of a polycarboxylic acid water reducing agent, 40 parts of monopotassium phosphate, 0.8 part of cellulose ether and 0.3 part of polypropylene fiber, and uniformly stirring for later use;
(2) mixing with sand: mixing the guniting material with sand according to the proportion of 1:1, wherein the sand is medium sand;
(3) mixing with water: mixing the guniting material with sand, mixing with water according to the ratio of 100:30, stirring to form slurry, and carrying out guniting operation after uniformly mixing.
Determination of spray rebound rate of guniting material: adding water to adjust mortar slump to 8-10cm, placing a plastic cloth with thickness of 8mm under the guniting wall face and close to rock stratum foundation, and making the area be not less than 5m2And ejecting the concrete from the rock-receiving surface.
Through field inspection, the dust content in the construction process is reduced, and the rebound rate is reduced to 23% -28% from 35% of the traditional guniting material; the dead weight of the novel guniting material is reduced by 32-39% compared with that of the traditional guniting material; the adhesion is improved.
Experimental example 3
(1) Preparing a guniting material: accurately weighing 55 parts of magnesium oxide, 3 parts of triethanolamine, 0.8 part of sulfamate water reducer, 30 parts of ammonium dihydrogen phosphate, 1.5 parts of guar gum and 0.5 part of glass fiber, and uniformly stirring for later use;
(2) mixing with sand: mixing the guniting material with sand according to the proportion of 1:2, wherein the sand is medium sand;
(3) mixing with water: mixing the guniting material with sand, mixing with water according to the ratio of 100:25, stirring to form slurry, and carrying out guniting operation after uniformly mixing.
Determination of spray rebound rate of guniting material: adding water to adjust mortar slump to 8-10cm, placing a plastic cloth with thickness of 8mm under the guniting wall face and close to rock stratum foundation, and making the area be not less than 5m2And ejecting the concrete from the rock-receiving surface.
Through field inspection, the dust content in the construction process is reduced, and the rebound rate is reduced to 23% -28% from 40% of the traditional guniting material; the self weight of the novel guniting material is greatly reduced by 26-32% compared with the traditional guniting material; the adhesion is improved.
It should be noted that the above examples are only used to illustrate the technical solutions of the present invention and not to limit them. Although the present invention has been described in detail with reference to the examples given, those skilled in the art can modify the technical solution of the present invention as needed or equivalent substitutions without departing from the spirit and scope of the technical solution of the present invention.
Claims (5)
1. The phosphorus-magnesium-based cement guniting material is characterized by being prepared from the following materials in parts by weight: 40-70 parts of composite magnesium compound, 0.5-3 parts of composite retarder, 0.3-0.8 part of water reducing agent, 10-40 parts of phosphate, 0.5-1.5 parts of tackifier and 0.3-0.7 part of fiber;
wherein the compound magnesium compound is a mixture of magnesium oxide and at least one of magnesium hydroxide and magnesium phosphate;
the composite retarder is at least two of urea, boric acid, borax, triethanolamine and sodium tripolyphosphate;
the water reducing agent is at least one of a lignosulfonate water reducing agent, a sulfamate water reducing agent, a polycarboxylic acid water reducing agent and a naphthalene water reducing agent;
the phosphate is: at least one of diammonium hydrogen phosphate, ammonium dihydrogen phosphate, dipotassium hydrogen phosphate, and potassium dihydrogen phosphate;
the tackifier is at least one of cellulose ether, attapulgite, guar gum, xanthan gum, polyurethane and polyacrylamide;
the fiber is at least one of glass fiber and polypropylene fiber, and the length of the fiber is 10-30 mm.
2. A method of making a phosphomagnesium-based cement gunite material as defined in claim 1, comprising:
s1, preparing a guniting material: weighing each raw material of the magnesium phosphate-based cement guniting material according to the proportion, and uniformly stirring for later use;
s2, blending with sand: mixing the guniting material uniformly mixed in the step S1 with sand according to the ratio of 1: 1-3;
s3. mixing with water: and mixing the guniting material with sand, mixing with water according to the mass ratio of 100: 15-30, stirring to form slurry, and uniformly mixing to obtain the guniting material.
3. The method according to claim 2, wherein in step S2, the sand is medium sand or mixed sand, and the mixed sand is coarse sand: the fine sand is mixed sand with a ratio of 4: 1.
4. The use of the phosphomagnesium-based cement guniting material according to claim 1 in slope repair, surrounding rock support, roadway repair and reinforcement, leakage stoppage and rapid road first-aid repair.
5. The application of the magnesium phosphate-based cement guniting material obtained by the preparation method in slope repair, surrounding rock support, roadway repair and reinforcement, leakage stoppage and rapid road first-aid repair is realized by the preparation method in the claim 2 or 3.
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| CN112047708B (en) * | 2020-09-03 | 2021-05-07 | 淮安市博彦土木工程科学研究院有限公司 | Sprayed concrete and construction method thereof |
| CN112983479B (en) * | 2021-02-23 | 2023-06-02 | 陕西煤业化工技术研究院有限责任公司 | Roadway surrounding rock sealing protection method |
| KR102660677B1 (en) * | 2021-11-08 | 2024-04-26 | 인천국제공항공사 | Additive for magnesia phosphate ceramic binder, magnesia phosphate ceramic binder, and super-velocity magnesia phosphate ceramic modified concrete containing the same |
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