CN108285307B - Hybrid fiber reinforced ultrahigh-strength concrete and preparation method thereof - Google Patents

Hybrid fiber reinforced ultrahigh-strength concrete and preparation method thereof Download PDF

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CN108285307B
CN108285307B CN201810087725.7A CN201810087725A CN108285307B CN 108285307 B CN108285307 B CN 108285307B CN 201810087725 A CN201810087725 A CN 201810087725A CN 108285307 B CN108285307 B CN 108285307B
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mixing
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concrete
rotor
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CN108285307A (en
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蒋金洋
王立国
王凤娟
周文静
冯滔滔
许光远
褚洪岩
武胜萍
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Southeast University
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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
    • C04B28/02—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
    • C04B28/04—Portland cements
    • 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
    • C04B14/02—Granular materials, e.g. microballoons
    • C04B14/04—Silica-rich materials; Silicates
    • C04B14/06—Quartz; Sand
    • C04B14/068—Specific natural sands, e.g. sea -, beach -, dune - or desert sand
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B28—WORKING CEMENT, CLAY, OR STONE
    • B28C—PREPARING CLAY; PRODUCING MIXTURES CONTAINING CLAY OR CEMENTITIOUS MATERIAL, e.g. PLASTER
    • B28C5/00—Apparatus or methods for producing mixtures of cement with other substances, e.g. slurries, mortars, porous or fibrous compositions
    • B28C5/003—Methods for mixing
    • B28C5/006—Methods for mixing involving mechanical aspects
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B28—WORKING CEMENT, CLAY, OR STONE
    • B28C—PREPARING CLAY; PRODUCING MIXTURES CONTAINING CLAY OR CEMENTITIOUS MATERIAL, e.g. PLASTER
    • B28C5/00—Apparatus or methods for producing mixtures of cement with other substances, e.g. slurries, mortars, porous or fibrous compositions
    • B28C5/40—Mixing specially adapted for preparing mixtures containing fibres
    • B28C5/402—Methods
    • 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
    • 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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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Ceramic Engineering (AREA)
  • Structural Engineering (AREA)
  • Materials Engineering (AREA)
  • Organic Chemistry (AREA)
  • Civil Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Inorganic Chemistry (AREA)
  • Curing Cements, Concrete, And Artificial Stone (AREA)
  • Preparation Of Clay, And Manufacture Of Mixtures Containing Clay Or Cement (AREA)

Abstract

The invention discloses a hybrid fiber reinforced ultrahigh-strength concrete and a preparation method thereof, wherein the concrete is mainly prepared from the following raw materials in parts by weight: 430-520 parts of ordinary portland cement, 200-270 parts of fly ash, 60-90 parts of silica fume, 20-26 parts of an expanding agent, 710 parts of fine aggregate, 680-760 parts of coarse aggregate, 75-100 parts of microwire steel fiber, 90-120 parts of microwire end hook steel fiber, 15-20 parts of polycarboxylic acid water reducer and 160 parts of water 150-160. Compared with the prior art, the raw materials of the invention comprise the hybrid fiber, and the mixing of the fibers with different length-diameter ratios (meeting a certain mixing amount proportion) can not only improve the strength and toughness of the concrete, but also effectively control the non-structural cracks of the concrete, so that the hybrid fiber concrete has better reinforcing and toughening effects than the traditional fiber concrete. In addition, the present invention utilizes the counter-flow principle or the cross-flow principle and adopts a rotary mixing agitator, which has unexpected advantages for the mixing of raw materials, especially for steel fibers, and can greatly improve the performance of the final product.

Description

Hybrid fiber reinforced ultrahigh-strength concrete and preparation method thereof
Technical Field
The invention relates to hybrid fiber reinforced ultrahigh-strength concrete and a preparation method thereof, belonging to the technical field of ultrahigh-strength concrete.
Background
In recent decades, the buildings and structures of the infrastructure gradually develop towards high-rise and super high-rise buildings, large-span and heavy structures, and many structures are exposed in severe environments such as sea salt areas, freezing areas, erosive environments and the like, so that the ordinary cement concrete can be deteriorated prematurely under the above conditions to cause damage and even failure, the requirements of modern building systems are more and more difficult to meet, and more high-altitude and harbor island construction projects need a large amount of cement concrete materials. The requirements on the strength, toughness, functionality and durability of cement concrete are higher and higher, the traditional cement concrete material has low strength, poor ductility and durability and obviously cannot meet the requirements, and more domestic and foreign scholars begin to research the concrete with ultrahigh performance.
The high-strength high-performance concrete has the advantages of high strength, good impermeability, excellent durability and workability and the like, but the high-strength high-performance concrete is easy to break and low in bending strength, in order to improve the brittleness of the concrete, researchers add fibers to prepare ultra-high performance fiber reinforced concrete such as glass fiber concrete, polypropylene fiber concrete, steel fiber concrete, carbon fiber concrete and the like, so that the pressure resistance, the impermeability, the toughness, the fatigue resistance and the durability are greatly improved, and the fly ash, the silica fume and other industrial wastes are fully utilized in the preparation of the ultra-high performance concrete, so that the high-performance fiber reinforced concrete has sustainable development, and has wide application prospects.
At present, the ultrahigh-performance fiber reinforced concrete mainly takes active powder concrete without coarse aggregate as a main material, the application of the coarse aggregate (the diameter is more than 5cm) in the ultrahigh-performance fiber reinforced concrete is always less due to the limitation of strength, and the ultrahigh-performance fiber reinforced concrete containing the coarse aggregate, which mainly comprises a single fiber and two or more fibers as reinforcing materials, is not common. At present, the research on the mixing of steel fibers with different length-diameter ratios is limited, and particularly, the uniform dispersion of the mixed fibers in the ultra-high performance concrete is very difficult by utilizing the traditional stirring mode, so that the development and the application of the high performance fiber reinforced concrete in China are limited to a certain extent.
Disclosure of Invention
The purpose of the invention is as follows: in order to solve the technical problems, the invention provides hybrid fiber reinforced ultrahigh-strength concrete and a preparation method thereof.
The technical scheme is as follows: in order to achieve the purpose, the invention discloses hybrid fiber reinforced ultrahigh-strength concrete which is characterized by mainly comprising the following raw materials in parts by weight:
430-520 parts of ordinary portland cement, 270 parts of fly ash, 60-90 parts of silica fume, 20-26 parts of expanding agent, 710 parts of fine aggregate 620, 680-760 parts of coarse aggregate, 75-100 parts of microfilament steel fiber,
90-120 parts of micro-fiber end hook type steel fiber, 15-20 parts of polycarboxylic acid water reducing agent and 160 parts of water 150-.
The ultra-high strength concrete is concrete with the strength grade of 150MPa or above.
The ordinary Portland cement is PII 52.5-grade ordinary Portland cement.
The fly ash is I-class fly ash.
SiO in the silica fume2The content should be greater than or equal to 95%, and the specific surface area should not be less than 15000m2/kg。
The swelling agent is calcium swelling agent, and is light yellow powder with specific surface area of 200m or more2Per Kg, the residue on a 1.18mm sieve is less than or equal to 0.5 percent, the expansion rate of water is limited to be more than or equal to 0.06 percent for 7d, and the expansion rate of water is limited to be more than or equal to-0.01 percent for 21d in air after 7 d.
The fine aggregate is river sand, and the fineness modulus is 2.3-2.8 medium sand in the area II. The mud content is less than or equal to 0.5 percent.
The coarse aggregate is basalt, 5-12mm continuous graded basalt broken stone is used as the coarse aggregate, the mass content of needle-shaped flaky particles is less than or equal to 5%, the mud content is not more than 0.5%, and the mud block content is not more than 0.2%.
The steel fiber is microfilament steel fiber and microfilament end hook type steel fiber, the diameter of the microfilament steel fiber is more than or equal to 0.2mm, the length of the microfilament steel fiber is more than or equal to 13mm, the length-diameter ratio of the microfilament end hook type steel fiber is 64-66, the tensile strength of the microfilament end hook type steel fiber is more than or equal to 3000MPa, the diameter of the microfilament end hook type steel fiber is more than or equal to 0.35mm, the length of the microfilament end hook type steel.
The solid content of the polycarboxylic acid high-efficiency water reducing agent is more than or equal to 40 percent (mass content), and the water reducing rate is more than or equal to 33.9 percent.
The water is tap water or drinking water, and meets the requirements of concrete water standards (JGJ 63-2006).
The invention also provides a preparation method of the hybrid fiber reinforced ultrahigh-strength concrete, which comprises the following steps:
(1) taking cement, fly ash, silica fume, an expanding agent, river sand and basalt, and uniformly stirring and mixing the cement, the fly ash, the silica fume, the expanding agent, the river sand and the basalt by using a rotary mixing stirrer to obtain a uniform mixture;
(2) adding a polycarboxylic acid high-efficiency water reducing agent into water, stirring to obtain a uniform water solvent, slowly adding the uniform water solvent into the mixture, and then adjusting the working parameters of a rotary mixing stirrer to mix to obtain uniformly mixed slurry;
(3) and (3) adding the microwire steel fibers and the microwire end hooking steel fibers into the mixed slurry, then adjusting the working parameters of the rotary type mixing stirrer again to mix, and finally forming and maintaining according to the national standard to obtain the hybrid fiber reinforced ultrahigh-strength concrete.
More specifically, the preparation method of the hybrid fiber ultrahigh-strength concrete comprises the following steps:
the mixer and the container for holding concrete are fully wetted by cement mortar with the same water-cement ratio as the ultra-high-strength concrete.
(1) Sequentially adding the weighed cement, fly ash, silica fume, expanding agent, river sand and basalt into a mixing container of a stirrer, covering the container of the stirrer, starting a rotor and the mixing container, wherein the anticlockwise rotation speed of the rotor is 130-170r/min, the clockwise rotation speed of the mixing container is 20-40r/min, and the rotation directions of the rotor and the mixing container are opposite. The mixing time is 100-140S, and the mixture is obtained by uniformly stirring and mixing the materials.
(2) And adding the weighed polycarboxylic acid high-efficiency water reducing agent into water, and stirring for several seconds by using a glass rod to obtain the uniform water solvent. Slowly adding the uniformly stirred water solvent into the mixture from the water injection port, and then adjusting the speed of a rotor, wherein the anticlockwise rotation speed of the rotor is 280-320r/min, the clockwise rotation speed of the mixing container is 20-40r/min, the rotation directions of the rotor and the mixing container are opposite, and the mixing time is 300-420S, so as to obtain uniformly mixed slurry.
(3) And stopping the rotor and the mixing container, adding the weighed microwire steel fibers and the microwire end hook steel fibers, restarting the rotor and the mixing container, wherein the anticlockwise rotation speed of the rotor is 280-140 r/min, the clockwise rotation speed of the mixing container is 20-40r/min, the rotation directions of the rotor and the mixing container are opposite, and the mixing time is 100-140S, so that the hybrid fiber reinforced ultrahigh-strength concrete can be obtained.
The rotary mixing stirrer is designed according to a countercurrent principle or a transverse flow principle, is provided with a rotary mixing container which is obliquely installed, and sends materials to be mixed to an eccentrically installed high-speed rotary mixing tool part, a rotor and the mixing container can realize opposite or reverse relative rotation, the rotating speed can be adjusted in real time according to personal needs to form an inverse mixture material flow with high speed difference, and therefore the materials are uniformly mixed to the maximum extent.
The technical effects are as follows: compared with the prior art, the raw materials comprise the hybrid fibers, and the mixing of the fibers with different length-diameter ratios (meeting a certain mixing amount proportion) can improve the strength and toughness of the concrete and also can effectively control the non-structural cracks of the concrete, so that the hybrid fiber concrete has better reinforcing and toughening effects than the traditional fiber concrete; and wherein a suitable amount of coarse aggregate is added, but ultimately without affecting strength properties and reducing use costs.
The invention adopts a rotary mixing stirrer, materials to be mixed are sent to an eccentrically-arranged high-speed rotary mixing tool part, a rotor and a mixing container can realize opposite or reverse relative rotation, the rotating speed can be adjusted in real time according to personal requirements to form an inverse mixture flow with high speed difference, the obliquely-arranged rotary mixing container and a fixed multifunctional tool are arranged together to ensure that the mixture flow forms strong vertical component and ensure that the materials are fully and uniformly mixed, and the multifunctional tool can reliably prevent the mixture from being attached to the bottom and the wall of the mixing container and accelerate the discharging when the mixing time is over. The mixing mode has unexpected advantages for the mixing of raw materials, especially for steel fibers, and can greatly improve the performance of a final product.
Detailed Description
The present invention is further illustrated by the following specific examples, which are intended to be purely exemplary of the invention and are not intended to limit its scope, as various equivalent modifications of the invention will become apparent to those skilled in the art after reading the present invention and fall within the scope of the appended claims.
The raw materials used in the following examples are all as follows:
the ultra-high strength concrete refers to concrete with the strength grade of 150MPa or above.
The ordinary Portland cement is PII 52.5-grade ordinary Portland cement.
The fly ash is class I fly ash.
SiO in silica fume2The content should be greater than or equal to 95%, and the specific surface area should not be less than 15000m2/kg。
The swelling agent is calcium swelling agent, and is light yellow powder with specific surface area of 200m or more2Per Kg, the residue on a 1.18mm sieve is less than or equal to 0.5 percent, the expansion rate of water is limited to be more than or equal to 0.06 percent for 7d, and the expansion rate of water is limited to be more than or equal to-0.01 percent for 21d in air after 7 d.
The fine aggregate is river sand, and the fineness modulus is 2.3-2.8 medium sand in the area II. The mud content is less than or equal to 0.5 percent.
The coarse aggregate is basalt, 5-12mm continuous graded basalt broken stone is used as the coarse aggregate, the mass content of needle-shaped flaky particles is less than or equal to 5%, the mud content is not more than 0.5%, and the mud block content is not more than 0.2%.
The steel fiber is microfilament steel fiber and microfilament end hook type steel fiber, the diameter of the microfilament steel fiber is more than or equal to 0.2mm, the length is more than or equal to 13mm, the length-diameter ratio is about 65, the tensile strength is more than or equal to 3000MPa, the diameter of the microfilament end hook type steel fiber is more than or equal to 0.35mm, the length is more than or equal to 20mm, the length-diameter ratio is about 57, and the tensile strength is more than or equal to 2000 MPa.
The solid content of the polycarboxylic acid high-efficiency water reducing agent is more than or equal to 40 percent (mass content), and the water reducing rate is more than or equal to 33.9 percent.
The water is tap water or drinking water, and meets the requirements of concrete water standards (JGJ 63-2006).
The stirrer used was a rotary mixer (Aili-licensed R-type intensive mixer).
Example 1
The hybrid fiber reinforced ultrahigh-strength concrete comprises the following components in parts by weight:
466.1 parts of ordinary portland cement, 233.1 parts of fly ash, 77.7 parts of silica fume, 23.3 parts of expanding agent,
699.2 parts of fine aggregate, 738.1 parts of coarse aggregate, 97.5 parts of microfilament steel fiber,
97.5 parts of microfilament end hook type steel fiber, 17.1 parts of polycarboxylic acid water reducing agent and 155.4 parts of water.
The preparation method comprises the following steps:
the mixer and the container for holding concrete are fully wetted by cement mortar with the same water-cement ratio as the ultra-high-strength concrete.
(1) Sequentially adding the weighed cement, fly ash, silica fume, expanding agent, river sand and basalt into a mixing container of a stirrer, covering the container of the stirrer, starting a rotor and the mixing container, wherein the anticlockwise rotation speed of the rotor is 150r/min, the clockwise rotation speed of the mixing container is 30r/min, and the rotation directions of the rotor and the mixing container are opposite. The mixing time is 120S, and the mixture is obtained by stirring and mixing the materials evenly.
(2) And adding the weighed polycarboxylic acid high-efficiency water reducing agent into water, and stirring for several seconds by using a glass rod to obtain the uniform water solvent. Slowly adding the uniformly stirred water solvent into the mixture from the water filling port, then adjusting the speed of the rotor, wherein the anticlockwise rotation speed of the rotor is 300r/min, the clockwise rotation speed of the mixing container is 30r/min, the rotation directions of the rotor and the mixing container are opposite, and the mixing time is 360S, so that the uniformly mixed slurry is obtained.
(3) Stopping rotor and mixing vessel, adding the fine silk steel fiber of weighing and the fine silk end colludes steel fiber, restart rotor and mixing vessel, rotor counter clockwise rotation speed is 300r/min, and mixing vessel clockwise rotation speed is 30r/min, and the rotor is opposite with mixing vessel direction of rotation, and the mixing time is 120S, can obtain hybrid fiber reinforcing superhigh intensity concrete.
Example 2
The hybrid fiber reinforced ultrahigh-strength concrete comprises the following components in parts by weight:
466.1 parts of ordinary portland cement, 233.1 parts of fly ash, 77.7 parts of silica fume, 23.3 parts of expanding agent,
699.2 parts of fine aggregate, 738.1 parts of coarse aggregate, 78 parts of microfilament steel fiber,
117 parts of microfilament end hook type steel fiber, 17.1 parts of polycarboxylic acid water reducing agent and 155.4 parts of water.
The preparation method comprises the following steps:
the mixer and the container for holding concrete are fully wetted by cement mortar with the same water-cement ratio as the ultra-high-strength concrete.
(1) Sequentially adding the weighed cement, fly ash, silica fume, expanding agent, river sand and basalt into a mixing container of a stirrer, covering the container of the stirrer, starting a rotor and the mixing container, wherein the anticlockwise rotation speed of the rotor is 150r/min, the clockwise rotation speed of the mixing container is 30r/min, and the rotation directions of the rotor and the mixing container are opposite. The mixing time is 120S, and the mixture is obtained by stirring and mixing the materials evenly.
(2) And adding the weighed polycarboxylic acid high-efficiency water reducing agent into water, and stirring for several seconds by using a glass rod to obtain the uniform water solvent. Slowly adding the uniformly stirred water solvent into the mixture from the water filling port, then adjusting the speed of the rotor, wherein the anticlockwise rotation speed of the rotor is 300r/min, the clockwise rotation speed of the mixing container is 30r/min, the rotation directions of the rotor and the mixing container are opposite, and the mixing time is 360S, so that the uniformly mixed slurry is obtained.
(3) Stopping rotor and mixing vessel, adding the fine silk steel fiber of weighing and the fine silk end colludes steel fiber, restart rotor and mixing vessel, rotor counter clockwise rotation speed is 300r/min, and mixing vessel clockwise rotation speed is 30r/min, and the rotor is opposite with mixing vessel direction of rotation, and the mixing time is 120S, can obtain hybrid fiber reinforcing superhigh intensity concrete.
Example 3
The hybrid fiber reinforced ultrahigh-strength concrete comprises the following components in parts by weight:
430 parts of ordinary portland cement, 200 parts of fly ash, 60 parts of silica fume, 20 parts of expanding agent,
620 parts of fine aggregate, 680 parts of coarse aggregate, 75 parts of microfilament steel fiber,
90 parts of microfilament end hook type steel fiber, 15 parts of polycarboxylic acid water reducing agent and 150 parts of water.
The preparation method comprises the following steps:
the mixer and the container for holding concrete are fully wetted by cement mortar with the same water-cement ratio as the ultra-high-strength concrete.
(1) Sequentially adding the weighed cement, fly ash, silica fume, expanding agent, river sand and basalt into a mixing container of a stirrer, covering the container of the stirrer, starting a rotor and the mixing container, wherein the anticlockwise rotation speed of the rotor is 130r/min, the clockwise rotation speed of the mixing container is 40r/min, and the rotation directions of the rotor and the mixing container are opposite. The mixing time is 100S, and the mixture is obtained by stirring and mixing the materials evenly.
(2) And adding the weighed polycarboxylic acid high-efficiency water reducing agent into water, and stirring for several seconds by using a glass rod to obtain the uniform water solvent. Slowly adding the uniformly stirred water solvent into the mixture from the water filling port, then adjusting the speed of a rotor, wherein the anticlockwise rotation speed of the rotor is 280r/min, the clockwise rotation speed of a mixing container is 40r/min, the rotation directions of the rotor and the mixing container are opposite, and the mixing time is 300S, so as to obtain uniformly mixed slurry.
(3) Stopping rotor and mixing vessel, adding the fine silk steel fiber of weighing and the fine silk end colludes steel fiber, restart rotor and mixing vessel, rotor counter clockwise rotation speed is 280r/min, and mixing vessel clockwise rotation speed is 40r/min, and the rotor is opposite with mixing vessel direction of rotation, and the mixing time is 100S, can obtain hybrid fiber reinforcing superhigh intensity concrete.
Example 4
The hybrid fiber reinforced ultrahigh-strength concrete comprises the following components in parts by weight:
520 parts of ordinary portland cement, 270 parts of fly ash, 90 parts of silica fume, 26 parts of expanding agent,
710 parts of fine aggregate, 760 parts of coarse aggregate, 100 parts of microfilament steel fiber,
120 parts of microfilament end hook type steel fiber, 20 parts of polycarboxylic acid water reducing agent and 160 parts of water.
The preparation method comprises the following steps:
the mixer and the container for holding concrete are fully wetted by cement mortar with the same water-cement ratio as the ultra-high-strength concrete.
(1) Sequentially adding the weighed cement, fly ash, silica fume, expanding agent, river sand and basalt into a mixing container of a stirrer, covering the container of the stirrer, starting a rotor and the mixing container, wherein the anticlockwise rotation speed of the rotor is 170r/min, the clockwise rotation speed of the mixing container is 20r/min, and the rotation directions of the rotor and the mixing container are opposite. The mixing time is 140S, and the mixture is obtained by stirring and mixing the materials evenly.
(2) And adding the weighed polycarboxylic acid high-efficiency water reducing agent into water, and stirring for several seconds by using a glass rod to obtain the uniform water solvent. Slowly adding the uniformly stirred water solvent into the mixture from the water filling port, then adjusting the speed of a rotor, wherein the anticlockwise rotation speed of the rotor is 320r/min, the clockwise rotation speed of a mixing container is 20r/min, the rotation directions of the rotor and the mixing container are opposite, and the mixing time is 420S, so as to obtain uniformly mixed slurry.
(3) Stopping rotor and mixing vessel, adding the fine silk steel fiber of weighing and the fine silk end colludes steel fiber, restart rotor and mixing vessel, rotor counter clockwise rotation speed is 320r/min, and mixing vessel clockwise rotation speed is 20r/min, and the rotor is opposite with mixing vessel direction of rotation, and the mixing time is 140S, can obtain hybrid fiber reinforcing superhigh intensity concrete.
Comparative example 1:
the same as example 1, except that the microwire end hook type steel fibers were all replaced with the same amount of microwire steel fibers, and the others were not changed.
Comparative example 2:
the same as example 1, except that the microwire steel fibers were all replaced with the same amount of microwire end-hooked steel fibers, and the others were not changed.
Comparative example 3:
the same as in example 1, except that the coarse aggregate was replaced with the same amount of fine aggregate.
Comparative example 4
The same as example 1, except that the rotary mixer was not used in the preparation method, but a forced single horizontal shaft concrete mixer was used.
And (3) performance detection:
the concrete mixtures and hardened concrete properties of examples 1 and 2 and comparative examples 1 to 4 were tested and the results are shown in Table I.
Table one test results
Numbering Compressive strength/MPa Split tensile strength/MPa Four point bending strength/MPa Modulus of elasticity/GPa
Example one 155.3 9.9 21.5 56.3
Example two 162.3 11.4 21.9 54.3
Comparative example 1 135.1 6.2 17.6 48.6
Comparative example 2 134.7 6.5 17.2 47.9
Comparative example 3 149.8 8.9 20.2 52.8
Comparative example 4 125.6 4.1 15.8 44.2
From the results of the above table, compared with comparative examples 1 and 2, i.e. compared with the case of adding only one fiber, such as the microfilament steel fiber or the microfilament end hook type steel fiber, the compression strength, the split tensile strength, the four-point bending strength and the elastic modulus of the product are all significantly improved after the hybrid fiber is added; in addition, compared with the comparative example 3, that is, compared with the product without the addition of the coarse aggregate, the product strength of the product of the invention after the addition of the coarse aggregate is basically equivalent, which shows that the product strength is hardly affected by the addition of the coarse aggregate; finally, the compressive strength, split tensile strength, four-point flexural strength and modulus of elasticity of the product of the invention are all significantly improved compared to comparative example 4, i.e. compared to conventional mixing methods.
Finally, the above embodiments are only used to illustrate the technical solutions of the present invention. If modifications or equivalents are made to the technical examples of the present invention by those of ordinary skill in the art without departing from the spirit of the present invention, the scope of the present invention is defined by the claims.

Claims (8)

1. The hybrid fiber reinforced ultrahigh-strength concrete is characterized by being mainly prepared from the following raw materials in parts by weight:
430-520 parts of ordinary portland cement, 270 parts of fly ash, 60-90 parts of silica fume, 20-26 parts of an expanding agent, 710 parts of fine aggregate, 680-760 parts of coarse aggregate, 75-100 parts of microwire steel fiber, 90-120 parts of microwire end hook steel fiber, 15-20 parts of polycarboxylic acid water reducer and 160 parts of water 150;
wherein, SiO in the silica fume2The content is more than or equal to 95 percent, and the specific surface area is not less than 15000m2Per kg, the diameter of the microfilament steel fiber is more than or equal to 0.2mm, the length is more than or equal to 13mm, the length-diameter ratio is 64-66, and the tensile strength is more than or equal to 3000 Mpa; the diameter of the micro-wire end hook type steel fiber is more than or equal to 0.35mm, the length is more than or equal to 20mm, the length-diameter ratio is 56-58, and the tensile strength is more than or equal to 2000 MPa.
2. The hybrid fiber reinforced ultrahigh strength concrete according to claim 1, wherein said Portland cement is a PII-52.5 grade Portland cement.
3. The hybrid fiber reinforced ultrahigh-strength concrete according to claim 1, wherein the fly ash is class I fly ash.
4. The hybrid fiber reinforced ultrahigh-strength concrete according to claim 1, wherein the expanding agent is a calcareous expanding agent, is yellowish powder and has a specific surface area of 200m or more2Kg, the screen residue of a 1.18mm sieve is less than or equal to 0.5 percent, and the expansion rate is limitedThe middle 7d is more than or equal to 0.06 percent, and the 7d in water is transferred into air, and the 21d in the air is more than or equal to-0.01 percent.
5. The hybrid fiber reinforced ultrahigh-strength concrete according to claim 1, wherein the fine aggregate is river sand, sand in zone II with fineness modulus of 2.3-2.8, and the mud content is less than or equal to 0.5%; the coarse aggregate is basalt, 5-12mm continuous graded basalt broken stone is used as the coarse aggregate, the mass content of needle-shaped flaky particles is less than or equal to 5%, the mud content is not more than 0.5%, and the mud block content is not more than 0.2%.
6. The hybrid fiber reinforced ultrahigh-strength concrete according to claim 1, wherein the polycarboxylic acid high-efficiency water reducing agent has a solid content of 40% or more (mass content) and a water reducing rate of 33.9% or more.
7. The method for preparing hybrid fiber reinforced ultrahigh strength concrete according to any of claims 1 to 6, characterized by comprising the steps of:
(1) taking cement, fly ash, silica fume, an expanding agent, river sand and basalt, and uniformly stirring and mixing the cement, the fly ash, the silica fume, the expanding agent, the river sand and the basalt by using a rotary mixing stirrer to obtain a uniform mixture;
(2) adding a polycarboxylic acid high-efficiency water reducing agent into water, stirring to obtain a uniform water solvent, slowly adding the uniform water solvent into the mixture, and then adjusting the working parameters of a rotary mixing stirrer to mix to obtain uniformly mixed slurry;
(3) and (3) adding the microwire steel fibers and the microwire end hooking steel fibers into the mixed slurry, then adjusting the working parameters of the rotary type mixing stirrer again to mix, and finally forming and maintaining according to the national standard to obtain the hybrid fiber reinforced ultrahigh-strength concrete.
8. The method of preparing hybrid fiber reinforced ultra-high strength concrete according to claim 7, wherein:
the working parameters of the rotary mixing stirrer in the step (1) are as follows: the counter-clockwise rotation speed of the rotor is 130-170r/min, the clockwise rotation speed of the mixing container is 20-40r/min, the rotation directions of the rotor and the mixing container are opposite, and the mixing time is 100-140 s;
the working parameters of the rotary mixing stirrer in the step (2) are as follows: the counterclockwise rotation speed of the rotor is 280-320r/min, the clockwise rotation speed of the mixing container is 20-40r/min, the rotation directions of the rotor and the mixing container are opposite, and the mixing time is 300-420 s;
the working parameters of the rotary mixing stirrer in the step (3) are as follows: the counter-clockwise rotation speed of the rotor is 280-320r/min, the clockwise rotation speed of the mixing container is 20-40r/min, the rotation directions of the rotor and the mixing container are opposite, and the mixing time is 100-140 s.
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