CN110577389B - High-strength fiber concrete and preparation method thereof - Google Patents

High-strength fiber concrete and preparation method thereof Download PDF

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Publication number
CN110577389B
CN110577389B CN201910999137.5A CN201910999137A CN110577389B CN 110577389 B CN110577389 B CN 110577389B CN 201910999137 A CN201910999137 A CN 201910999137A CN 110577389 B CN110577389 B CN 110577389B
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parts
fiber
concrete
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square mould
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CN110577389A (en
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陈炜强
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Fujian Quanzhou Baozhi Concrete Co ltd
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B28—WORKING CEMENT, CLAY, OR STONE
    • B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
    • B28B1/00—Producing shaped prefabricated articles from the material
    • B28B1/08—Producing shaped prefabricated articles from the material by vibrating or jolting
    • B28B1/087—Producing shaped prefabricated articles from the material by vibrating or jolting by means acting on the mould ; Fixation thereof to the mould
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B28—WORKING CEMENT, CLAY, OR STONE
    • B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
    • B28B1/00—Producing shaped prefabricated articles from the material
    • B28B1/52—Producing shaped prefabricated articles from the material specially adapted for producing articles from mixtures containing fibres, e.g. asbestos cement
    • 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
    • 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)
  • Manufacturing & Machinery (AREA)
  • Mechanical Engineering (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Inorganic Chemistry (AREA)
  • Materials Engineering (AREA)
  • Structural Engineering (AREA)
  • Organic Chemistry (AREA)
  • Curing Cements, Concrete, And Artificial Stone (AREA)

Abstract

The invention discloses a high-strength fiber concrete and a preparation method thereof, belonging to the technical field of building materials, wherein the high-strength fiber concrete comprises the following raw material components: 50-60 parts of broken stone, 400 parts of cement 350-containing materials, 2-2.5 parts of water reducing agent, 200 parts of water 150-containing materials, 30-45 parts of fiber mixture, 60-80 parts of adhesive, 15-20 parts of bentonite, and 40-50 parts of calcium chloride aqueous solution and sodium carbonate aqueous solution with the same concentration respectively.

Description

High-strength fiber concrete and preparation method thereof
Technical Field
The invention discloses high-strength fiber concrete and a preparation method thereof, and belongs to the technical field of building materials.
Background
Concrete is the most widely used building material in the world. Concrete has high compressive strength but low tensile strength, which results in the disadvantages of high brittleness, poor toughness, poor deformation resistance, etc. To compensate for the deficiencies in tensile strength of concrete, steel reinforcement is often used to reinforce concrete. In order to overcome the brittleness of common concrete and high-performance concrete, asbestos fiber, steel fiber, carbon fiber, polyvinyl alcohol fiber, polypropylene fiber, basalt fiber and other fibers with higher length and with toughening effect are used in the concrete. However, in the existing fiber concrete preparation process, the fiber material is directly added into the concrete and then is uniformly stirred to obtain the fiber concrete with higher strength and better toughness than the common concrete, but because the fiber has a certain length, the concrete is easy to have the phenomenon of agglomeration in the process of stirring and mixing with the concrete, thereby causing the strength of each part of the concrete to be inconsistent, reducing the overall strength of the concrete, particularly, after the concrete is solidified, the concrete is easy to crack due to uneven pulling stress, and simultaneously, the fiber forming a net can be wound on the stirring shaft to influence the production of the concrete, meanwhile, the fibers are blended in the concrete, the cross-linking of the reticular fibers in the thickness direction of the reticular fibers is difficult to generate after the concrete is formed, the strength and toughness of the fiber concrete can not be obviously improved, thereby limiting the development of the fiber concrete.
Disclosure of Invention
The invention aims to solve the problem that the traditional fiber concrete is insufficient in overall strength and toughness, and provides high-strength fiber concrete and a preparation method thereof.
The invention realizes the aim through the following technical scheme, and the high-strength fiber concrete comprises the following raw material components: 50-60 parts of broken stone, 400 parts of cement 350-containing materials, 2-2.5 parts of water reducing agent, 200 parts of water 150-containing materials, 30-45 parts of fiber mixture, 60-80 parts of adhesive, 15-20 parts of bentonite, and 40-50 parts of calcium chloride aqueous solution and sodium carbonate aqueous solution with the same concentration respectively.
Preferably, the crushed stone is obtained by screening and ball milling through a screen, the particle size of the crushed stone is 8-12mm, the modulus is 2.5-3, the apparent density is 2400kg/m3, and the mud content is 3.5% -4%.
Preferably, the cement is a p.o.42.5 grade portland cement or a pozzolanic portland cement.
Preferably, the water reducing agent is sodium methylene diphenyl oxide (NNO), a polycarboxylic acid water reducing agent or an HSB aliphatic water reducing agent.
Preferably, the fiber mixture is two or three of polypropylene fiber, glass fiber and steel fiber, and is prepared according to the components of 1:1 or 1:1:1, and the length of the fiber is 20-30 mm.
Preferably, the adhesive is epoxy resin or modified water glass.
A method of preparing high strength fiber concrete comprising the steps of:
(1) firstly, adding broken stone, cement, water, bentonite and a water reducing agent into a forced mixer, and uniformly mixing to obtain primary concrete;
(2) soaking the fiber mixture in sodium carbonate solution for 10-20min, and draining to obtain five parts;
(3) placing plastic films in three square molds and coating adhesives, horizontally laying one part of the fiber mixture in the step (2) according to the direction that the fiber length is parallel to the upper, lower, front and rear four surfaces of the first square mold, horizontally laying one part of the fiber mixture in the step (2) according to the direction that the fiber length is parallel to the upper, lower, left and right surfaces of the second square mold, and vertically laying one part of the fiber mixture in the step (2) according to the direction that the fiber length is parallel to the front, lower, left and right surfaces of the third square mold;
(4) pouring primary concrete into a first square mould in batches, simultaneously laying a part of fiber mixture according to the same method of the first square mould in the step (3), sealing the first square mould, and then overturning the first square mould by taking the left side surface and the right side surface of the first square mould as axial oscillation;
(5) pouring the primary concrete in the step (4) into a second square mould in batches, simultaneously laying the last part of fiber mixture according to the same method of the second square mould in the step (3), uniformly adding the sodium carbonate solution in the step (2) into the primary concrete, sealing the second square mould, and then overturning the second square mould by taking the front side and the rear side of the second square mould as axial oscillation;
(6) pouring the primary concrete obtained in the step (5) into a third square mould in batches, simultaneously uniformly adding a calcium chloride aqueous solution into the primary concrete, then sealing the third square mould, and then sequentially oscillating and turning the third square mould by taking the front side surface, the rear side surface and the left side surface and the right side surface of the third square mould as axial directions.
Preferably, the volume of the lightweight concrete poured into the three square moulds is 70-80% of the volume of the cavity of the square mould.
Compared with the prior art, the invention has the beneficial effects that:
one of them, through laying fiber mixture in square mould and concrete according to three dimension to make the fibre misce bene in each dimension under the effect of shaking the upset, it can produce the cross-linking each other, thereby form three-dimensional network, promoted the tensile strength of tearing of this fiber concrete each position greatly, reduced the phenomenon that the fracture appears after it solidifies, and make fiber concrete's compactness obtain effectual promotion, the apparent reinforcing its bulk strength and toughness.
Secondly, because the fiber mixture is uniformly dispersed in the concrete by adopting a vibration and turnover method, the problem that the production of the concrete is influenced by winding the fibers on the stirring shaft in a traditional stirring mode is avoided, and the problem that the strength of the traditional fiber concrete is uneven due to the fact that the fibers are easy to agglomerate in the preparation process of the traditional fiber concrete is also solved.
Thirdly, when the fiber mixture is uniformly mixed into concrete, sodium carbonate and calcium chloride aqueous solution are soaked in the fiber mixture and uniformly sprayed into the concrete, calcium carbonate generated by the reaction of the sodium carbonate and the calcium chloride aqueous solution is deposited on the fiber mixture, and a three-dimensional cross-linked network is also generated in the concrete, so that the curing effect is generated on the concrete, and the fibers are pre-fixed in the concrete, so that the problem that the fibers float due to light weight is avoided.
Detailed Description
The technical solutions of the present invention will be described clearly and completely with reference to specific embodiments, and it should be understood that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. 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.
Example 1
The high-strength fiber concrete comprises the following raw material components: 50 parts of broken stone, 350 parts of P.O.42.5-grade portland cement, 2 parts of sodium methylene diphenyl oxide (NNO), 150 parts of water, 35 parts of a mixture of polypropylene fibers and glass fibers, 20mm in fiber length, 60 parts of epoxy resin, 15 parts of bentonite, and 40 parts of calcium chloride aqueous solution and sodium carbonate aqueous solution with the same concentration respectively;
further, the particle diameter was 8mm, the modulus was 2.5, the apparent density was 2400kg/m3, and the sludge content was 3.5%.
Example 2
The high-strength fiber concrete comprises the following raw material components: 50 parts of broken stone, 350 parts of P.O.42.5-grade portland cement, 2 parts of sodium methylene diphenyl oxide (NNO), 150 parts of water, 40 parts of a mixture of polypropylene fibers and glass fibers, 20mm in fiber length, 60 parts of epoxy resin, 15 parts of bentonite, and 40 parts of calcium chloride aqueous solution and sodium carbonate aqueous solution with the same concentration respectively;
further, the particle diameter was 8mm, the modulus was 2.5, the apparent density was 2400kg/m3, and the sludge content was 3.5%.
Example 3
The high-strength fiber concrete comprises the following raw material components: 50 parts of broken stone, 350 parts of P.O.42.5-grade portland cement, 2 parts of sodium methylene diphenyl oxide (NNO), 150 parts of water, 45 parts of a mixture of polypropylene fibers and glass fibers, 20mm in fiber length, 60 parts of epoxy resin, 15 parts of bentonite, and 40 parts of calcium chloride aqueous solution and sodium carbonate aqueous solution with the same concentration respectively;
further, the particle diameter was 8mm, the modulus was 2.5, the apparent density was 2400kg/m3, and the sludge content was 3.5%.
Example 4
The high-strength fiber concrete comprises the following raw material components: 50 parts of broken stone, 350 parts of volcanic ash portland cement, 2 parts of sodium methylene diphenyl oxide (NNO), 150 parts of water, 35 parts of a mixture of polypropylene fibers and glass fibers, 20mm in fiber length, 60 parts of epoxy resin, 15 parts of bentonite, and 40 parts of calcium chloride aqueous solution and sodium carbonate aqueous solution with the same concentration respectively;
further, the particle diameter was 8, the modulus was 3, the apparent density was 2400kg/m3, and the sludge content was 3.5%.
Example 5
The high-strength fiber concrete comprises the following raw material components: 55 parts of broken stone, 400 parts of pozzolanic portland cement, 2 parts of HSB aliphatic water reducing agent, 180 parts of water, 40 parts of a mixture of glass fiber and steel fiber, 20mm in fiber length, 60 parts of epoxy resin, 18 parts of bentonite, and 45 parts of calcium chloride aqueous solution and sodium carbonate aqueous solution with the same concentration respectively;
further, the particle diameter was 8, the modulus was 3, the apparent density was 2400kg/m3, and the sludge content was 3.5%.
Example 6
The high-strength fiber concrete comprises the following raw material components: 60 parts of broken stone, 450 parts of pozzolanic portland cement, 2 parts of HSB aliphatic water reducing agent, 200 parts of water, 45 parts of a mixture of glass fiber and steel fiber, 20mm in fiber length, 60 parts of epoxy resin, 20 parts of bentonite, and 50 parts of calcium chloride aqueous solution and sodium carbonate aqueous solution with the same concentration respectively;
further, the particle diameter was 8, the modulus was 3, the apparent density was 2400kg/m3, and the sludge content was 3.5%.
Example 7
The high-strength fiber concrete comprises the following raw material components: 60 parts of broken stone, 450 parts of pozzolanic portland cement, 2 parts of HSB aliphatic water reducing agent, 200 parts of water, 45 parts of a mixture of polypropylene fiber and steel fiber, 20mm in fiber length, 60 parts of epoxy resin, 20 parts of bentonite, and 50 parts of calcium chloride aqueous solution and sodium carbonate aqueous solution with the same concentration respectively;
further, the particle diameter was 8, the modulus was 3, the apparent density was 2400kg/m3, and the sludge content was 4.5%.
Example 8
The high-strength fiber concrete comprises the following raw material components: 50 parts of broken stone, 350 parts of pozzolanic portland cement, 2 parts of HSB aliphatic water reducing agent, 150 parts of water, 35 parts of a mixture of polypropylene fiber, glass fiber and steel fiber, 20mm in fiber length, 60 parts of epoxy resin, 15 parts of bentonite, and 40 parts of calcium chloride aqueous solution and sodium carbonate aqueous solution with the same concentration respectively;
further, the particle diameter was 8, the modulus was 3, the apparent density was 2400kg/m3, and the sludge content was 4.5%.
Example 9
The high-strength fiber concrete comprises the following raw material components: 50 parts of broken stone, 350 parts of P.O.42.5-grade portland cement, 2 parts of sodium methylene diphenyl oxide (NNO), 150 parts of water, 35 parts of a mixture of polypropylene fibers and glass fibers, 30mm in fiber length, 60 parts of epoxy resin, 15 parts of bentonite, and 40 parts of calcium chloride aqueous solution and sodium carbonate aqueous solution with the same concentration respectively;
further, the particle diameter was 10mm, the modulus was 3, the apparent density was 2400kg/m3, and the sludge content was 3.5%.
The preparation method of the fiber concrete in the embodiment refers to respective proportions and is carried out according to the following steps:
(1) firstly, adding broken stone, cement, water, bentonite and a water reducing agent into a forced mixer, and uniformly mixing to obtain primary concrete;
(2) soaking the fiber mixture in sodium carbonate solution for 10-20min, and draining to obtain five parts;
(3) placing plastic films in three square molds and coating adhesives, horizontally laying one part of the fiber mixture in the step (2) according to the direction that the fiber length is parallel to the upper, lower, front and rear four surfaces of the first square mold, horizontally laying one part of the fiber mixture in the step (2) according to the direction that the fiber length is parallel to the upper, lower, left and right surfaces of the second square mold, and vertically laying one part of the fiber mixture in the step (2) according to the direction that the fiber length is parallel to the front, lower, left and right surfaces of the third square mold;
(4) pouring primary concrete into a first square mould in batches, simultaneously laying a part of fiber mixture according to the same method of the first square mould in the step (3), sealing the first square mould, and then overturning the first square mould by taking the left side surface and the right side surface of the first square mould as axial oscillation;
(5) pouring the primary concrete in the step (4) into a second square mould in batches, simultaneously laying the last part of fiber mixture according to the same method of the second square mould in the step (3), uniformly adding the sodium carbonate solution in the step (2) into the primary concrete, sealing the second square mould, and then overturning the second square mould by taking the front side and the rear side of the second square mould as axial oscillation;
(6) pouring the primary concrete obtained in the step (5) into a third square mould in batches, simultaneously uniformly adding a calcium chloride aqueous solution into the primary concrete, then sealing the third square mould, and then sequentially oscillating and turning the third square mould by taking the front side surface, the rear side surface and the left side surface and the right side surface of the third square mould as axial directions.
Further, the volume of the lightweight concrete poured into the three square molds accounts for 70% of the volume of the inner cavity of the square mold.
Comparative example 1
The common fiber concrete comprises the following raw materials: 50 parts of broken stone, 350 parts of P.O.42.5-grade portland cement, 2 parts of sodium methylene diphenyl oxide (NNO), 180 parts of water, 35 parts of a mixture of polypropylene fibers and glass fibers, 20mm in fiber length and 15 parts of bentonite;
further, the particle diameter was 8mm, the modulus was 2.5, the apparent density was 2400kg/m3, and the sludge content was 3.5%.
The preparation method of the common fiber concrete comprises the following steps: adding the above mixture into a stirrer, and stirring for 10 min.
(1) Compressive Strength test of concrete
Manufacturing a 150mmX150mmX150mm cube test piece according to a standard method, curing for 28 days under the conditions that the temperature is 20+3 ℃ and the relative humidity is more than 90%, testing by using a standard test method, and calculating according to a specified method to obtain a compression strength value;
in the test, 3 test pieces in each embodiment are selected, and the compressive strength sigma of A, B, C position points in each test piece is testedAWherein the linear distance between the A, B, C three position points is 30mm-40mm, and the average value is the compression strength sigma of the test piecenThen, the average compressive strength σ of the 3 test pieces in this example was calculatedSnWhere σ isnAnd σSnIs + -10%, and if the two values are within + -10%, the compressive strength of the set of examples is σSnOtherwise, then the set of trials should be redone.
(2) Flexural Strength test of concrete
Maintaining a 150mmX150mmX550mm beam-shaped test piece for 28 days at the temperature of 20+3 ℃ and the relative humidity of more than 90%, then damaging the test piece under the action of a double-pivot load with a clear span of 450mm, and calculating according to a specified method to obtain a breaking strength value;
3 test pieces in each embodiment are selected in the test, and the flexural strength F of each test piece is testednAnd the average flexural strength F of the 3 test pieces of this example was calculatedSnIn which F isSnAnd FnIs + -10%, and if the two values are within + -10%, the flexural strength of the group of examples is FSnOtherwise, then the set of trials should be redone.
The values of the compressive strength and flexural strength of the concrete in each example are determined according to the above method and are shown in the attached Table 1:
Figure BDA0002240721690000081
attached table 1
The compressive strength and the flexural strength can be tested by using a universal testing machine, and the calculation methods of the compressive strength and the flexural strength belong to the common knowledge of the technicians in the field, and are not described too much.
It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein.
Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.

Claims (5)

1. The method for preparing the high-strength fiber concrete is characterized in that the concrete comprises the following raw material components: 50-60 parts of broken stone, 400 parts of cement 350-containing materials, 2-2.5 parts of water reducing agent, 200 parts of water 150-containing materials, 30-45 parts of fiber mixture, 60-80 parts of adhesive, 15-20 parts of bentonite, and 40-50 parts of calcium chloride aqueous solution and sodium carbonate aqueous solution with the same concentration respectively, and the method comprises the following steps:
(1) firstly, adding broken stone, cement, water, bentonite and a water reducing agent into a forced mixer, and uniformly mixing to obtain primary concrete;
(2) soaking the fiber mixture in sodium carbonate solution for 10-20min, and draining to obtain five parts;
(3) placing plastic films in three square molds and coating adhesives, horizontally laying one part of the fiber mixture in the step (2) according to the direction that the fiber length is parallel to the upper, lower, front and rear four surfaces of the first square mold, horizontally laying one part of the fiber mixture in the step (2) according to the direction that the fiber length is parallel to the upper, lower, left and right surfaces of the second square mold, and vertically laying one part of the fiber mixture in the step (2) according to the direction that the fiber length is parallel to the front, lower, left and right surfaces of the third square mold;
(4) pouring the primary concrete into a first square mould in batches, simultaneously laying a part of fiber mixture according to the same method of the first square mould in the step (3), and then turning the first square mould by taking the left side surface and the right side surface of the first square mould as axial oscillation after the first square mould is sealed;
(5) pouring the primary concrete in the step (4) into a second square mould in batches, simultaneously laying the last part of fiber mixture according to the same method of the second square mould in the step (3), uniformly adding the sodium carbonate solution in the step (2) into the primary concrete, and then turning over the second square mould by taking the front side and the rear side of the second square mould as axial oscillation after the second square mould is sealed;
(6) pouring the primary concrete obtained in the step (5) into a third square mould in batches, simultaneously uniformly adding a calcium chloride aqueous solution into the primary concrete, and then sealing the third square mould, and then oscillating and turning the third square mould in sequence by taking the front side surface, the rear side surface and the left side surface and the right side surface of the third square mould as axial directions;
the fiber mixture is two or three of polypropylene fiber, glass fiber and steel fiber, and is prepared according to the components of 1:1 or 1:1:1, the length of the fiber is 20-30mm, and the volume of the lightweight concrete poured into the three square molds accounts for 70-80% of the volume of the inner cavity of the square mold.
2. The method for preparing high-strength fiber concrete according to claim 1, wherein the crushed stone is obtained by sieving and ball milling through a screen, and has a particle size of 8-12mm, a modulus of 2.5-3, an apparent density of 2400kg/m3, and a mud content of 3.5% -4%.
3. A method of making high strength fibre concrete according to claim 1 wherein the cement is a p.o.42.5 grade portland cement or a pozzolanic portland cement.
4. The method for preparing high-strength fiber concrete according to claim 1, wherein the water reducing agent is sodium methylene diphenyl oxide, a polycarboxylic acid water reducing agent or an HSB aliphatic water reducing agent.
5. The method for preparing high-strength fiber concrete according to claim 1, wherein the adhesive is epoxy resin or modified water glass.
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CN113929388A (en) * 2021-10-25 2022-01-14 深圳市纳路特建材科技有限公司 Wear-resistant anti-cracking cement mortar and preparation method thereof
CN114031346A (en) * 2021-11-15 2022-02-11 深圳市纳路特建材科技有限公司 Anti-cracking cement mortar and application thereof
CN114315294B (en) * 2021-12-06 2022-10-21 北京建筑大学 Low-strength tough waterproof concrete for underground engineering and preparation method thereof

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CN105347751A (en) * 2015-11-24 2016-02-24 江苏兴厦建筑工程集团有限公司 Preparation method of high-strength concrete
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