CN115073054A - High-strength ultrafine additive for shotcrete, preparation method and use method thereof, low-resilience shotcrete and preparation method thereof - Google Patents

High-strength ultrafine additive for shotcrete, preparation method and use method thereof, low-resilience shotcrete and preparation method thereof Download PDF

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Publication number
CN115073054A
CN115073054A CN202210856126.3A CN202210856126A CN115073054A CN 115073054 A CN115073054 A CN 115073054A CN 202210856126 A CN202210856126 A CN 202210856126A CN 115073054 A CN115073054 A CN 115073054A
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China
Prior art keywords
strength
shotcrete
parts
resilience
low
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CN202210856126.3A
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Chinese (zh)
Inventor
王林
王洪波
马永良
罗广斌
宋少民
贺鑫鑫
魏子程
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Shaanxi Dehe Building Materials Co ltd
Beijing University of Civil Engineering and Architecture
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Shaanxi Dehe Building Materials Co ltd
Beijing University of Civil Engineering and Architecture
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Priority to CN202210856126.3A priority Critical patent/CN115073054A/en
Publication of CN115073054A publication Critical patent/CN115073054A/en
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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
    • C04B40/00—Processes, in general, for influencing or modifying the properties of mortars, concrete or artificial stone compositions, e.g. their setting or hardening ability
    • C04B40/0028—Aspects relating to the mixing step of the mortar preparation
    • C04B40/0039—Premixtures of ingredients
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
    • C04B28/02—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing hydraulic cements other than calcium sulfates
    • 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
    • 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
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
    • C04B2201/50—Mortars, concrete or artificial stone characterised by specific physical values for the mechanical strength
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
    • Y02W30/00—Technologies for solid waste management
    • Y02W30/50—Reuse, recycling or recovery technologies
    • Y02W30/91—Use of waste materials as fillers for mortars or concrete

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Ceramic Engineering (AREA)
  • Materials Engineering (AREA)
  • Structural Engineering (AREA)
  • Organic Chemistry (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Inorganic Chemistry (AREA)
  • Curing Cements, Concrete, And Artificial Stone (AREA)

Abstract

The invention provides a high-strength ultramicro additive for sprayed concrete, a preparation method and a use method thereof, low-resilience sprayed concrete and a preparation method thereof, relating to the technical field of building materials, and the high-strength ultramicro additive for sprayed concrete comprises the following components: ultrafine silica, ground slag powder, optionally aluminum sulfate, optionally calcium sulfate, calcium hydroxide, sodium hydroxide, polyacrylamide, optionally hydroxypropyl methylcellulose, and polyvinyl alcohol. The invention solves the technical problems of high rebound rate, large dust rate and low strength of common sprayed concrete, and achieves the technical effects of effectively reducing the rebound rate and the dust amount of the sprayed concrete and simultaneously improving the strength and the durability of the sprayed concrete.

Description

High-strength ultrafine additive for shotcrete, preparation method and use method thereof, low-resilience shotcrete and preparation method thereof
Technical Field
The invention relates to the technical field of building materials, in particular to a high-strength ultrafine additive for shotcrete, a preparation method and a use method thereof, and low-resilience shotcrete and a preparation method thereof.
Background
At present, in tunnel construction, the method of using shotcrete to reinforce surrounding rock is a common method, so that a complete, stable and certain-strength structure is formed to ensure construction safety. Besides tunnel engineering, the sprayed concrete is also applied to various fields such as water conservancy and hydropower, slope protection and support, mines, underground engineering, engineering repair and the like.
Compared with the traditional support form, the sprayed concrete forming anchor-spraying support and the sprayed concrete support have incomparable superiority, and have the functions of supporting, filling, isolating and converting a lined object, thereby saving steel and wood and reducing the construction cost on one hand; on the other hand, the construction is simple, the work is safe, the heavy physical labor is reduced, and the one-step forming and the acceleration of the tunneling speed are facilitated; therefore, shotcrete will be used more and more widely in the future.
At present, the dosage of sprayed concrete is sharply increased along with the increase of engineering projects, common sprayed concrete generally consists of cement, fly ash, gravel aggregate, a water reducing agent and an accelerating agent, the rebound rate of the common sprayed concrete is over 30 percent, the dust rate is high, a large amount of waste is caused, the construction quality of the sprayed concrete is influenced, and certain potential safety hazards are caused to a spraying hand.
In view of the above, the present invention is particularly proposed.
Disclosure of Invention
One of the objects of the present invention is to provide a high-strength ultrafine admixture for shotcrete, which can reduce the amount of cement used while reducing the rebound resilience, reduce the cost of shotcrete, and improve the strength and durability of shotcrete.
The second purpose of the invention is to provide a preparation method of the high-strength ultramicro admixture for the shotcrete, which has simple and high-efficiency process.
The invention also aims to provide a using method of the high-strength ultramicro admixture for the shotcrete, which can effectively reduce the rebound rate of the shotcrete and improve the strength and the durability of the shotcrete.
The fourth purpose of the invention is to provide a low-resilience shotcrete which has the advantages of low resilience and high strength.
The fifth purpose of the invention is to provide a preparation method of the low-resilience shotcrete, which has simple and efficient process.
In order to achieve the above purpose of the present invention, the following technical solutions are adopted:
in a first aspect, the high-strength ultramicro admixture for the sprayed concrete comprises the following components in parts by weight:
47-57 parts of superfine silicon dioxide, 32-42 parts of ground slag powder, 0-5 parts of aluminum sulfate, 0-5 parts of calcium sulfate, 2-3 parts of calcium hydroxide, 2-3 parts of sodium hydroxide, 0.3-0.7 part of polyacrylamide, 0-0.8 part of hydroxypropyl methyl cellulose and 0.05-0.15 part of polyvinyl alcohol;
wherein the fineness of the ultrafine silicon dioxide and the fineness of the ground slag powder are both independently nanoscale.
Further, the specific surface area of the high-strength ultramicro admixture is 800- 2 /kg。
In a second aspect, a method for preparing a high-strength ultra-micro additive for shotcrete comprises the following steps:
mixing the components in proportion to obtain the high-strength ultramicro additive.
In a third aspect, a method for using a high-strength ultramicro admixture for shotcrete comprises the following steps:
the high-strength ultramicro admixture is added into the sprayed concrete to reduce the rebound rate of the sprayed concrete.
In a fourth aspect, the low-resilience shotcrete is mainly prepared from the following components:
cementing material, coarse aggregate, fine aggregate, the high-strength ultramicro additive, a water reducing agent and water.
Further, the high-strength ultramicro additive accounts for 4-8% of the weight of the cementing material;
the low-resilience shotcrete further comprises an accelerator.
Further, the cementitious material includes cement and optionally a mineral admixture, wherein the coarse aggregate includes, but is not limited to, stone and the fine aggregate includes, but is not limited to, sand.
Furthermore, the rebound rate of the low-rebound-rate shotcrete is less than 10%;
the 7d compressive strength of the low-resilience shotcrete is more than 37 MPa.
In a fifth aspect, a method for preparing low-resilience shotcrete comprises the following steps:
and mixing a cementing material, coarse aggregate, fine aggregate, the high-strength ultramicro additive, a water reducing agent and water to obtain the low-resilience shotcrete.
Further, the preparation method of the low-resilience shotcrete comprises the following steps:
firstly mixing coarse aggregate, fine aggregate, cement, mineral admixture, the high-strength ultramicro admixture and a water reducing agent, then adding water for mixing, then adding an accelerating agent for mixing, and spraying to obtain the low-resilience-rate sprayed concrete.
Compared with the prior art, the invention has at least the following beneficial effects:
the invention provides a high-strength ultramicro additive for sprayed concrete, which comprises the following components in parts by weight: 47-57 parts of superfine silicon dioxide, 32-42 parts of ground slag powder, 0-5 parts of aluminum sulfate, 0-5 parts of calcium sulfate, 2-3 parts of calcium hydroxide, 2-3 parts of sodium hydroxide, 0.3-0.7 part of polyacrylamide, 0-0.8 part of hydroxypropyl methyl cellulose and 0.05-0.15 part of polyvinyl alcohol; wherein the fineness of the ultrafine silicon dioxide and the fineness of the ground slag powder are both independently nanoscale. The high-strength ultrafine admixture provided by the invention takes ultrafine silicon dioxide and ground slag powder as main components, wherein the ultrafine silicon dioxide and the ground slag powder both have nanometer-scale fineness, the main components of the ground slag powder are silicon oxide and aluminum oxide, and the ultrafine silicon dioxide and the aluminum oxide can improve the bonding strength between sprayed concrete cement paste and aggregate through the activity effect, the filling effect and the crystal nucleus effect of the ultrafine silicon dioxide and the aluminum oxide, so that the rebound rate is reduced; meanwhile, the aluminum sulfate and the sodium hydroxide can promote the early hydration of the cement and improve the early strength of the concrete; calcium sulfate, calcium hydroxide and sodium hydroxide can react with silicon oxide and aluminum oxide to form hydrated calcium silicate gel, so that the strength of the sprayed concrete is improved; the hydroxypropyl methyl cellulose can improve the viscosity of the sprayed concrete; the polyvinyl alcohol has the function of obviously improving the strength in the cement base material; the polyacrylamide can greatly improve the yield stress and the plastic viscosity of the injection and reduce the rebound; the high-strength ultramicro additive can obviously improve the early strength of the sprayed concrete, improve the bonding force between cement paste and aggregate, reduce the rebound rate and dust amount of the sprayed concrete in the construction process and simultaneously ensure that the sprayed concrete has better strength and durability by the synergistic cooperation of the specific components and the weight ratio thereof.
The preparation method of the high-strength ultramicro additive for the sprayed concrete provided by the invention is simple in process and high in efficiency.
The application method of the high-strength ultramicro additive for the sprayed concrete provided by the invention can effectively reduce the rebound rate of the sprayed concrete and improve the strength and durability of the sprayed concrete.
The low-resilience shotcrete provided by the invention has the advantages of low resilience and high strength.
The preparation method of the low-resilience shotcrete provided by the invention is simple in process and high in efficiency.
Detailed Description
The technical solutions of the present invention will be described clearly and completely with reference to the following embodiments, and it should be understood that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
According to a first aspect of the invention, a high-strength ultramicro admixture for shotcrete is provided, which comprises the following components in parts by weight:
47-57 parts of superfine silicon dioxide, 32-42 parts of ground slag powder, 0-5 parts of aluminum sulfate, 0-5 parts of calcium sulfate, 2-3 parts of calcium hydroxide, 2-3 parts of sodium hydroxide, 0.3-0.7 part of polyacrylamide, 0-0.8 part of hydroxypropyl methyl cellulose and 0.05-0.15 part of polyvinyl alcohol;
wherein the fineness of the ultrafine silica and the fineness of the ground slag powder are both independently nanoscale.
The high-strength ultramicro additive for sprayed concrete provided by the invention takes ultrafine silicon dioxide and ground slag powder as main components, wherein the ultrafine silicon dioxide and the ground slag powder both have nanometer-scale fineness, the main components of the ground slag powder are silicon oxide and aluminum oxide, and the ultrafine silicon dioxide and the aluminum oxide can improve the bonding strength between sprayed concrete cement paste and aggregate through self activity effect, filling effect and crystal nucleus effect, so that the rebound rate is reduced; meanwhile, the aluminum sulfate and the sodium hydroxide can promote the early hydration of the cement and improve the early strength of the concrete; calcium sulfate, calcium hydroxide and sodium hydroxide can react with silicon oxide and aluminum oxide to form hydrated calcium silicate gel, so that the strength of the sprayed concrete is improved; the hydroxypropyl methyl cellulose can improve the viscosity of the sprayed concrete; the polyvinyl alcohol has the function of obviously improving the strength in the cement base material; the polyacrylamide can greatly improve the yield stress and the plastic viscosity of the injection and reduce the rebound.
The high-strength ultramicro additive for the sprayed concrete can obviously improve the early strength of the sprayed concrete, improve the bonding force between cement paste and aggregate, reduce the rebound rate and dust amount of the sprayed concrete in the construction process and simultaneously ensure that the sprayed concrete has better strength and durability by the synergistic cooperation of the specific components and the weight ratio thereof.
In the present invention, the typical but non-limiting parts by weight of the ultrafine silica are, for example, 47 parts, 48 parts, 49 parts, 50 parts, 51 parts, 52 parts, 53 parts, 54 parts, 55 parts, 56 parts, 57 parts; typical but not limiting parts by weight of ground slag powder are for example 32 parts, 33 parts, 34 parts, 35 parts, 36 parts, 37 parts, 38 parts, 39 parts, 40 parts, 41 parts, 42 parts, typical but not limiting parts by weight of aluminium sulphate are for example 0 parts, 1 part, 2 parts, 3 parts, 4 parts, 5 parts, typical but not limiting parts by weight of calcium hydroxide are for example 2 parts, 2.5 parts, 3 parts, typical but not limiting parts by weight of sodium hydroxide are for example 2 parts, 2.5 parts, 3 parts, typical but not limiting parts by weight of polyacrylamide are for example 0.3 parts, 0.4 parts, 0.5 parts, 0.6 parts, 0.7 parts, typical but not limiting parts by weight of hydroxypropyl methyl cellulose are for example 0 parts, 0.1 parts, 0.2 parts, 0.3 parts, 0.5 parts, 0.6 parts, 0.7 parts, 0.5 parts, 0.7 parts by weight of hydroxypropyl methyl cellulose, 0.6 parts, 0.7 parts, 0.8 parts, typical but not limiting parts by weight of polyvinyl alcohol are for example 0.05 parts, 0.1 parts, 0.15 parts.
The high-strength ultramicro admixture for the sprayed concrete provided by the invention has the advantages that the components and the weight ratio thereof are in the range, the synergistic effect can be obtained, the early strength and the bonding force of the sprayed concrete can be obviously improved, the rebound rate of the sprayed concrete in the construction process is reduced, and the performance of the high-strength ultramicro admixture is influenced by over-high or over-low weight ratio of the components, so that the ideal effect of reducing the rebound rate of the sprayed concrete cannot be achieved.
In a preferred embodiment, the specific surface area of the high-strength ultrafine admixture for shotcrete of the present invention is 800-1200m 2 Per kg, with a typical but non-limiting specific surface area of, for example, 800m 2 /kg、850m 2 /kg、900m 2 /kg、950m 2 /kg、1000m 2 /kg、1050m 2 /kg、1100m 2 /kg、1150m 2 /kg、1200m 2 Kg, preferably 1000m 2 And/kg, the high-strength ultramicro admixture is more beneficial to effectively playing the roles of reducing the rebound rate of the sprayed concrete and improving the strength and the durability of the sprayed concrete.
The components and the weight ratio thereof can cooperate with each other, interact with each other and act jointly, so that the rebound rate and the dust amount of the sprayed concrete can be obviously reduced, the rebound rate of the sprayed concrete is controlled within 8 percent, the strength and the durability of the sprayed concrete are improved while the spraying time is saved, and the technical problems of high rebound rate, high dust rate and low strength of the common sprayed concrete are thoroughly solved.
According to a second aspect of the present invention, there is provided a method for preparing a high-strength ultra-micro admixture for shotcrete, comprising the steps of:
the components are mixed in proportion to obtain the high-strength ultramicro additive.
The preparation method of the high-strength ultramicro additive for the sprayed concrete provided by the invention is simple in process and high in efficiency.
According to a third aspect of the present invention, there is provided a method for using a high-strength ultra-micro admixture, comprising the steps of:
the high-strength ultramicro admixture is added into the sprayed concrete to reduce the rebound rate of the sprayed concrete.
The application method of the high-strength ultramicro additive for the sprayed concrete provided by the invention can effectively reduce the rebound rate of the sprayed concrete and improve the strength and durability of the sprayed concrete.
According to a fourth aspect of the present invention, there is provided a low-resilience shotcrete, which is prepared from:
the concrete comprises a cementing material, a coarse aggregate, a fine aggregate, the high-strength ultramicro additive, a water reducing agent and water.
The low-resilience shotcrete provided by the invention has the advantages of low resilience and high strength.
In a preferred embodiment, the high-strength ultra-micro admixture accounts for 4-8% of the weight of the gelled material, for example, 4%, 4.5%, 5%, 5.5%, 6%, 6.5%, 7%, 7.5%, 8%, but not limited thereto, and is more helpful for the high-strength ultra-micro admixture to exert effects so as to effectively reduce the rebound resilience of the sprayed concrete and effectively improve the strength and durability of the sprayed concrete, and the high-strength ultra-micro admixture accounts for too high or too low of the weight of the gelled material, which is not beneficial to the reduction of the rebound resilience of the sprayed concrete and the improvement of the strength and durability.
In the present invention, the components of the low-resilience shotcrete further include an accelerator, which may be added before the shotcrete is sprayed, and then sprayed to form the low-resilience shotcrete.
In the present invention, the type of the cement is not particularly limited, and any cement of the type commonly used in the art can be used in the low-resilience shotcrete of the present invention, for example, the cement can be cement or a composite cement of cement and mineral admixture, but is not limited thereto.
In a preferred embodiment, the low-resilience shotcrete provided by the present invention has a resilience of 10% or less and a 7d compressive strength of 37MPa or more.
Compared with common sprayed concrete, the low-resilience sprayed concrete provided by the invention not only has low resilience, but also has excellent early strength, so that the low-resilience sprayed concrete can be better used as sprayed concrete for supporting in the fields of tunnels, mines, slopes and the like, and the construction quality is improved.
According to a fifth aspect of the present invention, there is provided a method for preparing low-resilience shotcrete, comprising the steps of:
mixing a cementing material, a coarse aggregate, a fine aggregate, the high-strength ultramicro additive, a water reducing agent and water to obtain the low-resilience shotcrete.
The preparation method of the low-resilience shotcrete provided by the invention is simple in process and high in efficiency.
In a preferred embodiment, the method for preparing the low-rebound shotcrete of the present invention comprises the steps of:
firstly, mixing coarse aggregate, fine aggregate, cement, mineral admixture, any one of the high-strength ultramicro admixture and the water reducing agent, then adding water for mixing, then adding the accelerating agent for mixing, and spraying to obtain the low-resilience shotcrete.
The preparation method of the low-resilience shotcrete provided by the invention is simple and efficient in process, and is more beneficial to fully mixing the high-strength ultramicro additive and other components, so that the effect of the high-strength ultramicro additive is fully exerted, and the aims of effectively reducing the resilience and dust amount of the shotcrete and improving the strength and durability of the shotcrete are fulfilled.
The invention is further illustrated by the following examples. The materials in the examples are prepared according to known methods or are directly commercially available, unless otherwise specified.
Example 1
A high-strength ultramicro additive for sprayed concrete comprises the following components in percentage by weight:
52% of superfine silicon dioxide, 37% of ground slag powder, 2.5% of aluminum sulfate, 2.5% of calcium hydroxide, 2.5% of sodium hydroxide, 0.5% of polyacrylamide, 0.4% of hydroxypropyl methyl cellulose and 0.1% of polyvinyl alcohol.
Wherein, the fineness of the superfine silicon dioxide and the fineness of the ground slag powder are both nano-scale.
The specific surface area of the high-strength ultramicro admixture for shotcrete of the embodiment is 1000m 2 /kg。
Example 2
The difference between the high-strength ultrafine admixture for shotcrete provided in this example and example 1 is that the amount of ultrafine silica in this example is 47%, the amount of ground slag powder is 42%, and the rest is the same as example 1.
Example 3
The difference between the high-strength ultrafine admixture for shotcrete provided in this example and example 1 is that the ultrafine silica is 57%, the fine slag powder is 32%, and the rest is the same as example 1.
Example 4
The difference between the high-strength admixture for shotcrete provided in this example and example 1 is that aluminum sulfate was 0% and calcium sulfate was 5% in this example, and the rest is the same as example 1.
Example 5
A high-strength ultramicro additive for sprayed concrete comprises the following components in percentage by weight:
50% of superfine silicon dioxide, 39% of ground slag powder, 3% of aluminum sulfate, 2% of calcium sulfate, 3% of calcium hydroxide, 2% of sodium hydroxide, 0.4% of polyacrylamide, 0.5% of hydroxypropyl methyl cellulose and 0.1% of polyvinyl alcohol.
Wherein, the fineness of the superfine silicon dioxide and the fineness of the ground slag powder are both nano-scale.
The specific surface area of the high-strength ultramicro admixture for shotcrete of the embodiment is 1000m 2 /kg。
Example 6
The difference between the high-strength ultrafine admixture for shotcrete provided in this example and example 5 is that aluminum sulfate in this example is 5%, calcium sulfate in this example is 0%, and the rest is the same as example 5.
Example 7
The difference between the high-strength ultra-micro admixture for shotcrete provided in this example and example 5 is that polyacrylamide is 0.3%, hydroxypropyl methylcellulose is 0.6%, and the rest is the same as example 5.
Example 8
The present example provides a high-strength admixture for shotcrete, which is different from example 5 in that polyacrylamide is 0.7%, hydroxypropyl methylcellulose is 0.2%, and the rest is the same as example 5.
Example 9
This example is a method for preparing the high-strength ultra-micro admixture for shotcrete provided in examples 1 to 8, including the steps of:
the components are mixed in proportion to obtain the high-strength ultramicro additive.
Example 10
The low-resilience shotcrete is mainly prepared from the following components in parts by weight:
375 parts of cement, 929 parts of sand, 701 parts of broken stone, 13.5 parts of accelerating agent, 170 parts of water, 4.97 parts of water reducing agent, 32 parts of high-strength ultramicro additive in example 1 and 45 parts of fly ash.
Examples 11 to 13
Examples 11 to 13 provide low-resilience shotcretes, which are different from example 10 in that the high-strength admixtures of examples 2 to 4 were added to the low-resilience shotcretes of examples 11 to 13, respectively, in this order, and the remainder was the same as example 10.
Example 14
The low-resilience shotcrete is mainly prepared from the following components in parts by weight:
425 parts of cement, 924 parts of sand, 694 parts of broken stone, 42.7 parts of an accelerator, 170 parts of water, 4.26 parts of a water reducing agent, 25 parts of the high-strength ultrafine additive of example 5 and 71 parts of fly ash.
Examples 15 to 17
Examples 15-17 provide low resilience shotcretes which differ from example 14 in that the high strength admixture of examples 6-8 was added to the low resilience shotcretes of examples 15-17 in the stated order, respectively, and the remainder was the same as in example 14.
Example 18
This example is a method of making a low-rebound shotcrete as provided in examples 10-17, comprising the steps of:
and mixing the components to obtain the low-resilience shotcrete.
Comparative example 1
The difference between the high-strength ultramicro admixture provided by the comparative example and the example 1 is that the high-strength ultramicro admixture does not contain superfine silicon dioxide, the weight percentage of the ground slag powder is 89%, and the rest is the same as the example 1.
Comparative example 2
The difference between the high-strength ultramicro admixture provided by the comparative example and the example 1 is that the weight percentage of the superfine silicon dioxide in the high-strength ultramicro admixture of the comparative example is 42 percent, the weight percentage of the ground slag powder is 47 percent, and the rest is the same as that of the example 1.
Comparative example 3
The difference between the high-strength ultramicro admixture provided by the comparative example and the example 1 is that the high-strength ultramicro admixture of the comparative example does not contain ground slag powder, meanwhile, the weight percentage of the superfine silicon dioxide is 89%, and the rest is the same as the example 1.
Comparative example 4
The difference between the high-strength ultramicro admixture provided by the comparative example and the example 1 is that the weight percentage of the ground slag powder in the high-strength ultramicro admixture of the comparative example is 27%, the weight percentage of the superfine silicon dioxide is 61%, and the rest is the same as that in the example 1.
Comparative example 5
The difference between the high-strength ultramicro admixture provided by the comparative example and the example 1 is that the high-strength ultramicro admixture does not contain calcium hydroxide, the weight percentage of sodium hydroxide is 5 percent, and the rest is the same as the example 1.
Comparative example 6
The difference between the high-strength ultramicro admixture provided by the comparative example and the example 1 is that the weight percentage of polyacrylamide in the high-strength ultramicro admixture of the comparative example is 0.1%, hydroxypropyl methylcellulose is 0.8%, and the rest is the same as that in the example 1.
Comparative examples 7 to 12
Comparative examples 7 to 12 provide shotcretes different from example 10 in that the high-strength ultrafine admixtures according to comparative examples 1 to 6 were added to the shotcretes according to comparative examples 7 to 12, respectively, and the rest were the same as example 10.
Comparative example 13
The shotcrete provided by the comparative example is different from the shotcrete provided by the example 10 in that the high-strength ultramicro additive is not added in the shotcrete of the comparative example, the weight part of the cement is 407 parts, and the rest is the same as that of the shotcrete provided by the example 10.
Comparative example 14
The sprayed concrete provided by the comparative example is different from the sprayed concrete provided by the example 14 in that the high-strength ultramicro additive is not added into the sprayed concrete of the comparative example, and the weight ratio of the sprayed concrete of the comparative example is as follows:
404 parts of cement, 903 parts of sand, 833 parts of broken stone, 42.7 parts of an accelerator, 185 parts of water, 4.26 parts of a water reducing agent and 71 parts of fly ash;
the rest is the same as in example 14.
Test example 1
The low-rebound shotcretes provided in examples 10 to 13 and the shotcretes provided in comparative examples 7 to 13 were tested for the properties shown in Table 1, and the results are shown in Table 1;
the test method for the 7-day compressive strength comprises the following steps: after the concrete mixture is filled into a mould, the mould is removed for 24 hours, and the concrete mixture is placed in a standard curing room (20 +/-2 ℃, the relative humidity of more than 95 percent and more than 95 percent, and the cubic compressive strength is measured after curing for 7 days);
the average resilience is measured by the following method: in the test, the method for weighing and calculating the rebound quantity by collecting the rebound concrete by using the color strip cloth and the method for calculating the rebound quantity by using the contrast analysis mode of measuring the excavation section and the primary support section to calculate the quantity of the sprayed concrete and the quantity of the sprayed concrete actually used by the project department are adopted to calculate the rebound quantity of the sprayed concrete.
The low-resilience shotcretes provided in examples 14 to 17 and the shotcrete provided in comparative example 14 were tested according to the properties of table 2, and the test methods were referred to the above-mentioned methods, and the results are shown in table 2.
TABLE 1
Figure T_220714102011474_474305001
TABLE 2
Figure T_220714102011631_631069002
As can be seen from the data in tables 1 and 2, the high-strength ultramicro admixture of the invention can obviously reduce the rebound resilience of the shotcrete through the synergistic cooperation of the specific components and the weight ratio thereof, and the obtained low-rebound-resilience shotcrete can reduce the rebound resilience by nearly 30% compared with the common shotcrete and can improve the 7d compressive strength by nearly 13MPa compared with the common shotcrete; therefore, the high-strength ultramicro additive can greatly improve the binding power and the setting speed of the sprayed concrete in a water-rich section, greatly reduce the rebound quantity and ensure that the sprayed concrete has better strength and durability.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.

Claims (10)

1. The high-strength ultramicro additive for the sprayed concrete is characterized by comprising the following components in parts by weight:
47-57 parts of superfine silicon dioxide, 32-42 parts of ground slag powder, 0-5 parts of aluminum sulfate, 0-5 parts of calcium sulfate, 2-3 parts of calcium hydroxide, 2-3 parts of sodium hydroxide, 0.3-0.7 part of polyacrylamide, 0-0.8 part of hydroxypropyl methyl cellulose and 0.05-0.15 part of polyvinyl alcohol;
wherein the fineness of the ultrafine silicon dioxide and the fineness of the ground slag powder are both independently nanoscale.
2. The high-strength ultramicro admixture as claimed in claim 1, wherein the specific surface area of the high-strength ultramicro admixture is 800- 2 /kg。
3. The method for preparing the high-strength ultramicro admixture according to claim 1 or 2, characterized by comprising the following steps:
mixing the components in proportion to obtain the high-strength ultramicro additive.
4. The use method of the high-strength ultramicro admixture according to claim 1 or 2, characterized by comprising the following steps:
the high-strength ultramicro admixture is added into the sprayed concrete to reduce the rebound rate of the sprayed concrete.
5. The low-resilience shotcrete is characterized by being mainly prepared from the following components in parts by weight:
a cementitious material, coarse aggregate, fine aggregate, the high-strength admixture of claim 1 or 2, a water reducing agent, and water.
6. The low-resilience shotcrete according to claim 5, wherein the high-strength ultra micro admixture accounts for 4-8% of the weight of the cement;
the low-resilience shotcrete further comprises an accelerator.
7. The low-rebound shotcrete of claim 6, wherein the cementitious material comprises cement and optionally a mineral admixture.
8. The low-resilience shotcrete according to any one of claims 5 to 7, wherein the low-resilience shotcrete has a resilience of 10% or less;
the 7d compressive strength of the low-resilience shotcrete is more than 37 MPa.
9. A method for preparing low-resilience shotcrete according to any one of claims 5 to 8, comprising the steps of:
and mixing a cementing material, coarse aggregate, fine aggregate, the high-strength ultramicro additive, a water reducing agent and water to obtain the low-resilience shotcrete.
10. The method for preparing low-rebound shotcrete according to claim 9, comprising the steps of:
firstly mixing coarse aggregate, fine aggregate, cement, mineral admixture, the high-strength ultramicro admixture and a water reducing agent, then adding water for mixing, then adding an accelerating agent for mixing, and spraying to obtain the low-resilience-rate sprayed concrete.
CN202210856126.3A 2022-07-21 2022-07-21 High-strength ultrafine additive for shotcrete, preparation method and use method thereof, low-resilience shotcrete and preparation method thereof Pending CN115073054A (en)

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