CN115368106A - High-strength cement concrete and preparation method thereof - Google Patents
High-strength cement concrete and preparation method thereof Download PDFInfo
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- CN115368106A CN115368106A CN202211298565.3A CN202211298565A CN115368106A CN 115368106 A CN115368106 A CN 115368106A CN 202211298565 A CN202211298565 A CN 202211298565A CN 115368106 A CN115368106 A CN 115368106A
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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
- C04B28/24—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 alkyl, ammonium or metal silicates; containing silica sols
- C04B28/26—Silicates of the alkali metals
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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
- C04B14/00—Use of inorganic materials as fillers, e.g. pigments, for mortars, concrete or artificial stone; Treatment of inorganic materials specially adapted to enhance their filling properties in mortars, concrete or artificial stone
- C04B14/38—Fibrous materials; Whiskers
- C04B14/48—Metal
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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
- C04B20/00—Use of materials as fillers for mortars, concrete or artificial stone according to more than one of groups C04B14/00 - C04B18/00 and characterised by shape or grain distribution; Treatment of materials according to more than one of the groups C04B14/00 - C04B18/00 specially adapted to enhance their filling properties in mortars, concrete or artificial stone; Expanding or defibrillating materials
- C04B20/02—Treatment
- C04B20/023—Chemical treatment
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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
- C04B24/00—Use of organic materials as active ingredients for mortars, concrete or artificial stone, e.g. plasticisers
- C04B24/12—Nitrogen containing compounds organic derivatives of hydrazine
- C04B24/123—Amino-carboxylic acids
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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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- 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)
- General Chemical & Material Sciences (AREA)
- Inorganic Chemistry (AREA)
- Civil Engineering (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
The invention discloses high-strength cement concrete and a preparation method thereof, belonging to the technical field of building materials. The high-strength cement concrete comprises the following raw materials in parts by weight: 200 to 220 parts of cement, 20 to 30 parts of water glass, 30 to 40 parts of fly ash, 450 to 550 parts of broken stone, 250 to 260 parts of quartz sand, 20 to 30 parts of kaolin, 15 to 20 parts of composite steel fiber (modified ultra-short steel fiber and threaded short steel fiber), 8 to 10 parts of sodium diethylenetriamine pentaacetate and 3.2 to 3.8 parts of water reducing agent. The high-strength cement concrete has high compressive strength (51.2 to 53.1MPa) and high breaking strength (12.5 to 13.6 MPa), solves the technical problem of poor toughness of the cement concrete, and realizes balance and unification of the cement concrete material in the aspects of high strength and high toughness.
Description
Technical Field
The invention relates to the technical field of building materials, in particular to high-strength cement concrete and a preparation method thereof.
Background
Concrete is one of the leading civil engineering materials of the present generation. It is an artificial stone material made up by using cementing material, granular aggregate (also called aggregate), water and additive and admixture which are added according to a certain proportion through the processes of uniformly stirring, compacting, forming, curing and hardening. The concrete has the characteristics of rich raw materials, low price and simple production process, so that the consumption of the concrete is increased more and more. Meanwhile, the concrete also has the characteristics of high compressive strength, good durability, wide strength grade range and the like, so the concrete has wide application range, is used in various civil engineering, namely shipbuilding industry, mechanical industry, ocean development, geothermal engineering and the like, and is also an important material.
With the continuous development of concrete composition materials, the performance requirements of people on concrete are not limited to compressive strength, but the durability, the impact resistance and the flexural strength of heavy concrete are added on the basis of the strength, and the requirements of various performance indexes of the concrete are more clear, detailed and specific than the requirements of the prior concrete. In order to improve the flexural strength of concrete, it is a common practice to increase the blending amount of ultra-fine steel fibers or the blending of multiple fibers. However, when the steel fiber content is large, the concrete basically has no workability, the construction performance is extremely poor, and the concrete cannot be practically applied; when multiple fibers are mixed, because the multiple fibers cannot synchronously work in a mixed and mixed state, no superimposed enhancement effect exists. Therefore, the flexural strength of the concrete cannot be obviously improved while the construction performance of the concrete is ensured.
Disclosure of Invention
The invention aims to provide high-strength cement concrete and a preparation method thereof, so as to solve the problems in the prior art.
In order to achieve the purpose, the invention provides the following scheme:
one of the technical schemes of the invention is as follows: the high-strength cement concrete comprises the following raw materials in parts by weight: 200 to 220 parts of cement, 20 to 30 parts of water glass, 30 to 40 parts of fly ash, 450 to 550 parts of broken stone, 250 to 260 parts of quartz sand, 20 to 30 parts of kaolin, 15 to 20 parts of composite steel fiber, 8 to 10 parts of sodium diethylenetriamine pentaacetate and 3.2 to 3.8 parts of water reducing agent;
the composite steel fiber comprises modified ultrashort steel fiber and thread type short steel fiber.
The diethylenetriamine pentaacetic acid sodium can effectively excite the activity of the fly ash, so that the strength of the concrete is improved, and the diethylenetriamine pentaacetic acid sodium can form a large amount of carboxyl and hydroxyl after meeting water, and due to the intermolecular force, the polar groups can be adsorbed to the surface of cement particles, so that smooth and compact Si-O-Si bonds, si-O-Al bonds and network structures thereof on the surface of an inactive material can be damaged, the crystal structure generates defects, the dissociation and hydration of the crystal structure are accelerated, and the compressive strength and the flexural strength of the concrete can be improved to the maximum extent.
Further, the cement is Portland cement with the grade of P.O.42.5; the modulus of the water glass is 1.8 to 2.8; the fly ash is I-grade fly ash, and the specific surface area is 600 to 700m 2 /kg。
Further, the crushed stone is basalt or granite, and the particle size is 10-13mm; the particle size of the quartz sand is 0.4-0.7 mm; the particle size of the kaolin is 3 to 5 mu m; the water reducing agent is a polycarboxylic acid water reducing agent.
Further, the effective diameter of the thread type short steel fiber is 0.45mm, the length is 30mm, and the tensile strength is 485MPa.
Further, the weight ratio of the modified ultra-short steel fiber to the threaded short steel fiber is 1 to 3.
Further, the preparation of the modified ultra-short steel fiber specifically comprises the following steps:
(1) Adding the ultrashort steel fiber into a silane coupling agent solution for reaction, and drying after the reaction is finished to obtain the pretreated ultrashort steel fiber;
(2) And carrying out melt blending on the pretreated ultrashort steel fiber, a compatilizer and thermoplastic resin to obtain the modified ultrashort steel fiber.
The ultrashort steel fiber has high strength and large elastic modulus, so that the cement concrete firstly participates in work when being subjected to tensile stress, but the ultrashort steel fiber has smooth surface and weak bonding with a base material, and is quickly pulled out of the base to quit work; the thread type short steel fiber has lower strength and small elastic modulus, and the ultra-short steel fiber can participate in work after basically quitting the work, so that the two fibers are simply mixed, the contribution to the flexural strength is only determined by the single fiber with large contribution, and the superposition reinforcement effect is not generated. The invention can form a layer of hyperbranched structure on the surface of the ultrashort steel fiber through modification treatment, can obviously increase the roughness of the surface of the ultrashort steel fiber, and greatly improve the interfacial friction force, physical adsorption and chemical bonding strength between interfaces, and at the moment, the two fibers are mixed to play a role in superposition and reinforcement.
Further, the compatibilizing agent comprises acrylic acid, oxazoline or a modified polyacrylate; the thermoplastic resin comprises polyvinyl chloride, polyvinyl acetate, polyamide or polymethyl methacrylate; the diameter of the ultra-short steel fiber is 0.25mm, the length of the ultra-short steel fiber is 10mm, and the monofilament tensile strength is 3050MPa.
Further, the reaction time is 20 to 30min; the temperature of the melt blending is 190 to 210 ℃, and the time is 3 to 5min.
Further, the preparation of the silane coupling agent solution specifically comprises: mixing and dissolving a silane coupling agent, ethanol and deionized water according to a volume ratio of 1.
Still further, the silane coupling agent includes methyltriethoxysilane, vinyltris (. Beta. -methoxyethoxy) silane, or vinyltris (. Beta. -methoxyethoxy) silane.
The second technical scheme of the invention is as follows: the preparation method of the high-strength cement concrete comprises the following steps:
(1) Weighing the raw materials in parts by weight, uniformly mixing water glass, kaolin, sodium diethylenetriamine pentaacetate, a water reducing agent and water, and grinding to obtain mixed slurry;
the weight ratio of the water to the cementing material is 0.35 to 0.50; the cementing material is cement, water glass and fly ash;
(2) And adding cement, fly ash, broken stone, quartz sand and composite steel fiber into the mixed slurry, and stirring for reaction to obtain the high-strength cement concrete.
Further, the grinding time is 30 to 40min; the stirring reaction time is 5 to 8min.
The invention discloses the following technical effects:
the high-strength cement concrete has high compressive strength (51.2 to 53.1MPa) and high breaking strength (12.5 to 13.6 MPa), solves the technical problem of poor toughness of the cement concrete, and realizes balance and unification of the cement concrete material in the aspects of high strength and high toughness.
Detailed Description
Reference will now be made in detail to various exemplary embodiments of the invention, the detailed description should not be construed as limiting the invention but as a more detailed description of certain aspects, features and embodiments of the invention.
It is to be understood that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. Further, for numerical ranges in this disclosure, it is understood that each intervening value, between the upper and lower limit of that range, is also specifically disclosed. Every smaller range between any stated value or intervening value in a stated range and any other stated or intervening value in that stated range is encompassed within the invention. The upper and lower limits of these smaller ranges may independently be included or excluded in the range.
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 invention belongs. Although only preferred methods and materials are described herein, any methods and materials similar or equivalent to those described herein can be used in the practice or testing of the present invention. All documents mentioned in this specification are incorporated by reference herein for the purpose of disclosing and describing the methods and/or materials associated with the documents. In case of conflict with any incorporated document, the present specification will control.
It will be apparent to those skilled in the art that various modifications and variations can be made in the specific embodiments of the present disclosure without departing from the scope or spirit of the disclosure. Other embodiments will be apparent to those skilled in the art from consideration of the specification. The specification and examples are exemplary only.
As used herein, the terms "comprising," "including," "having," "containing," and the like are open-ended terms that mean including, but not limited to.
The "parts" described in the following examples are all "parts by weight".
Example 1
A preparation method of high-strength cement concrete comprises the following steps:
the high-strength cement concrete is prepared from the following raw materials in parts by weight: 200 parts of cement, 25 parts of water glass, 30 parts of fly ash, 500 parts of gravel, 250 parts of quartz sand, 25 parts of kaolin, 18 parts of composite steel fiber (modified ultrashort steel fiber and threaded short steel fiber with the weight ratio of 2.
Cement: portland cement with the brand number of P.O.42.5;
water glass: the modulus is 2.5;
fly ash: class I fly ash with specific surface area of 600m 2 /kg；
Crushing stone: basalt with the grain size of 12 mm;
quartz sand: the grain diameter is 0.5mm;
kaolin: the grain diameter is 3 mu m;
water reducing agent: a polycarboxylic acid type water reducing agent;
thread type short steel fiber: the effective diameter is 0.45mm, the length is 30mm, and the tensile strength is 485MPa.
Preparing modified ultra-short steel fibers:
(1) Adding the ultrashort steel fiber into a silane coupling agent solution, stirring and reacting for 25min, and then drying for 1.5h in an environment at 100 ℃ to obtain the pretreated ultrashort steel fiber.
Preparation of silane coupling agent solution: mixing and dissolving a silane coupling agent (methyl triethoxysilane), ethanol and deionized water in a volume ratio of 1.
Ultra-short steel fiber: the diameter is 0.25mm, the length is 10mm, and the monofilament tensile strength is 3050MPa.
(2) And (3) carrying out melt blending on the pretreated ultrashort steel fiber, a compatilizer (acrylic acid) and a thermoplastic resin (polymethyl methacrylate) according to a weight ratio of 50.
The preparation method of the high-strength cement concrete comprises the following steps:
(1) Weighing the raw materials according to the parts by weight, uniformly mixing the water glass, the kaolin, the sodium diethylenetriamine pentaacetate, the water reducing agent and the water (the weight ratio of the water to the cementing material is 0.40), and then grinding for 30min to obtain mixed slurry.
(2) And adding cement, fly ash, broken stone, quartz sand and composite steel fiber into the mixed slurry, and stirring and reacting for 6min to obtain the high-strength cement concrete.
Example 2
A preparation method of high-strength cement concrete comprises the following steps:
the high-strength cement concrete is prepared from the following raw materials in parts by weight: 210 parts of cement, 20 parts of water glass, 40 parts of fly ash, 450 parts of crushed stone, 260 parts of quartz sand, 20 parts of kaolin, 15 parts of composite steel fiber (modified ultra-short steel fiber and threaded short steel fiber in a weight ratio of 3.
Cement: portland cement with the brand number of P.O.42.5;
water glass: the modulus is 2.8;
fly ash: class I fly ash with specific surface area of 650m 2 /kg；
Crushing stone: basalt with the grain size of 12 mm;
quartz sand: the grain diameter is 0.6mm;
kaolin: the grain diameter is 5 mu m;
water reducing agent: a polycarboxylic acid water reducing agent;
thread type short steel fiber: the effective diameter is 0.45mm, the length is 30mm, and the tensile strength is 485MPa.
Preparing modified ultra-short steel fibers:
(1) Adding the ultrashort steel fiber into a silane coupling agent solution, stirring and reacting for 20min, and then drying for 1.5h in an environment at 100 ℃ to obtain the pretreated ultrashort steel fiber.
Preparation of silane coupling agent solution: mixing and dissolving a silane coupling agent (vinyl tri (beta-methoxyethoxy) silane), ethanol and deionized water in a volume ratio of 1.
Ultra-short steel fiber: the diameter is 0.25mm, the length is 10mm, and the monofilament tensile strength is 3050MPa.
(2) And (3) carrying out melt blending on the pretreated ultrashort steel fiber, a compatilizer (modified polyacrylate) and a thermoplastic resin (polyvinyl acetate) according to a weight ratio of 50.
The preparation method of the high-strength cement concrete comprises the following steps:
(1) Weighing the raw materials in parts by weight, uniformly mixing water glass, kaolin, sodium diethylenetriamine pentaacetate, a water reducing agent and water (the weight ratio of the water to the cementing material is 0.38), and grinding for 35min to obtain mixed slurry.
(2) And adding cement, fly ash, broken stone, quartz sand and composite steel fiber into the mixed slurry, and stirring and reacting for 8min to obtain the high-strength cement concrete.
Example 3
A preparation method of high-strength cement concrete comprises the following steps:
the high-strength cement concrete is prepared from the following raw materials in parts by weight: 220 parts of cement, 30 parts of water glass, 35 parts of fly ash, 550 parts of broken stone, 250 parts of quartz sand, 30 parts of kaolin, 20 parts of composite steel fiber (modified ultra-short steel fiber and threaded short steel fiber with the weight ratio of 1.
Cement: portland cement with the brand number of P.O.42.5;
water glass: the modulus is 2.0;
fly ash: class I fly ash with specific surface area of 680m 2 /kg；
Crushing stone: granite with the grain diameter of 10 mm;
quartz sand: the grain diameter is 0.4mm;
kaolin: the grain diameter is 4 mu m;
water reducing agent: a polycarboxylic acid type water reducing agent;
thread type short steel fiber: the effective diameter is 0.45mm, the length is 30mm, and the tensile strength is 485MPa.
Preparing modified ultra-short steel fibers:
(1) Adding the ultra-short steel fiber into a silane coupling agent solution, stirring and reacting for 30min, and then drying for 1.5h in an environment with the temperature of 100 ℃ to obtain the pretreated ultra-short steel fiber.
Preparation of silane coupling agent solution: mixing and dissolving a silane coupling agent (vinyl tri (beta-methoxyethoxy) silane), ethanol and deionized water in a volume ratio of 1.
Ultra-short steel fiber: the diameter is 0.25mm, the length is 10mm, and the monofilament tensile strength is 3050MPa.
(2) And (3) carrying out melt blending on the pretreated ultrashort steel fiber, a compatilizer (oxazoline) and a thermoplastic resin (polyvinyl chloride) according to a weight ratio of 50.
The preparation method of the high-strength cement concrete comprises the following steps:
(1) Weighing the raw materials according to the parts by weight, uniformly mixing the water glass, the kaolin, the sodium diethylenetriamine pentaacetate, the water reducing agent and the water (the weight ratio of the water to the cementing material is 0.42), and grinding for 40min to obtain mixed slurry.
(2) And adding cement, fly ash, broken stone, quartz sand and composite steel fiber into the mixed slurry, and stirring and reacting for 5min to obtain the high-strength cement concrete.
Comparative example 1
The difference from example 1 is that the screw type short steel fiber in the composite steel fiber is entirely replaced with the modified ultra short steel fiber.
Comparative example 2
The difference from example 1 is that the modified ultra-short steel fiber in the composite steel fiber is replaced by the screw type short steel fiber.
Comparative example 3
The difference from example 1 is that the modified ultra-short steel fiber and the screw-type short steel fiber in the weight ratio of 2.
Comparative example 4
The method is the same as example 1, except that the preparation of the modified ultra-short steel fiber specifically comprises the following steps: adding the ultrashort steel fiber into a silane coupling agent solution, stirring and reacting for 25min, and then drying for 1.5h in an environment at 100 ℃ to obtain the modified ultrashort steel fiber.
Comparative example 5
The same as in example 1, except that sodium diethylenetriamine pentaacetate was replaced with diethylenetriamine.
Comparative example 6
The difference from example 1 is that the composite steel fiber is ultra-short steel fiber and screw type short steel fiber in the weight ratio of 2.
Comparative example 7
The difference from example 1 is that the modified ultra-short steel fibers in the composite steel fibers were replaced with the screw-type short steel fibers in an amount of 25 parts.
Effect example 1
The high-strength cement concrete prepared in examples 1 to 3 and comparative examples 1 to 7 was poured into a concrete mold (the size was 10cm × 10cm × 10 cm), compacted for 60s on a vibration table, and then cured for 28d, and the compressive strength and the flexural strength of the sample were measured according to GB/T50081-2019 "test method Standard for physical and mechanical Properties of concrete", and the results are shown in Table 1.
TABLE 1 compressive and flexural Strength of the samples
As can be seen from Table 1, the preparation method provided by the invention can significantly improve the flexural strength of the cement concrete, further improve the durability of the cement concrete, enable the performance of the cement concrete to be more excellent, and simultaneously ensure the construction performance of the cement concrete.
As can be seen from table 1, the compressive strengths of the cement concretes of comparative example 6 and comparative example 7 are almost the same as those of the examples of the present application, but the workability of the cement concretes prepared in comparative example 6 and comparative example 7 is extremely poor.
The above-described embodiments are merely illustrative of the preferred embodiments of the present invention, and do not limit the scope of the present invention, and various modifications and improvements of the technical solutions of the present invention can be made by those skilled in the art without departing from the spirit of the present invention, and the technical solutions of the present invention are within the scope of the present invention defined by the claims.
Claims (10)
1. The high-strength cement concrete is characterized by comprising the following raw materials in parts by weight: 200 to 220 parts of cement, 20 to 30 parts of water glass, 30 to 40 parts of fly ash, 450 to 550 parts of broken stone, 250 to 260 parts of quartz sand, 20 to 30 parts of kaolin, 15 to 20 parts of composite steel fiber, 8 to 10 parts of sodium diethylenetriamine pentaacetate and 3.2 to 3.8 parts of a water reducing agent;
the composite steel fiber comprises modified ultrashort steel fiber and thread type short steel fiber.
2. The high strength cementitious concrete of claim 1, wherein said cement is portland cement having a designation p.o.42.5; the modulus of the water glass is 1.8 to 2.8; the fly ash is I-grade fly ash, and the specific surface area is 600 to 700m 2 /kg。
3. The high-strength cement concrete as claimed in claim 1, wherein the crushed stone is basalt or granite, and the particle size is 10 to 13mm; the particle size of the quartz sand is 0.4 to 0.7mm; the particle size of the kaolin is 3 to 5 mu m; the water reducing agent is a polycarboxylic acid water reducing agent.
4. The high strength cement concrete according to claim 1, wherein the screw-type short steel fiber has an effective diameter of 0.45mm, a length of 30mm, and a tensile strength of 485MPa.
5. The high-strength cement concrete as claimed in claim 1, wherein the weight ratio of the modified ultra-short steel fiber to the threaded short steel fiber is 1 to 3.
6. The high-strength cement concrete according to claim 1, characterized in that the preparation of the modified ultra-short steel fibers specifically comprises:
firstly, adding the ultrashort steel fiber into a silane coupling agent solution for reaction, and drying after the reaction is finished to obtain the pretreated ultrashort steel fiber;
and secondly, carrying out melt blending on the pretreated ultrashort steel fiber, a compatilizer and thermoplastic resin to obtain the modified ultrashort steel fiber.
7. The high strength cement concrete according to claim 6, wherein the compatibilizer comprises acrylic acid, oxazoline or a modified polyacrylate; the thermoplastic resin comprises polyvinyl chloride, polyvinyl acetate, polyamide or polymethyl methacrylate; the diameter of the ultra-short steel fiber is 0.25mm, the length of the ultra-short steel fiber is 10mm, and the monofilament tensile strength is 3050MPa.
8. The high-strength cement concrete according to claim 6, wherein the reaction time is 20 to 30min; the temperature of the melt blending is 190 to 210 ℃, and the time is 3 to 5min.
9. A method for preparing the high-strength cement concrete as claimed in any one of claims 1 to 8, which is characterized by comprising the following steps:
firstly, weighing raw materials in parts by weight, uniformly mixing water glass, kaolin, sodium diethylenetriamine pentaacetate, a water reducing agent and water, and then grinding to obtain mixed slurry;
the weight ratio of the water to the cementing material is 0.35 to 0.50; the cementing material is cement, water glass and fly ash;
and secondly, adding cement, fly ash, broken stone, quartz sand and composite steel fiber into the mixed slurry, and stirring for reaction to obtain the high-strength cement concrete.
10. The method for preparing high-strength cement concrete according to claim 9, wherein the grinding time is 30 to 40min; the stirring reaction time is 5 to 8min.
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