CN113979694B - Exposed fiber concrete material and preparation method thereof - Google Patents
Exposed fiber concrete material and preparation method thereof Download PDFInfo
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- CN113979694B CN113979694B CN202111392055.8A CN202111392055A CN113979694B CN 113979694 B CN113979694 B CN 113979694B CN 202111392055 A CN202111392055 A CN 202111392055A CN 113979694 B CN113979694 B CN 113979694B
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- 239000000835 fiber Substances 0.000 title claims abstract description 132
- 239000000463 material Substances 0.000 title claims abstract description 65
- 238000002360 preparation method Methods 0.000 title claims abstract description 12
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 19
- 239000004568 cement Substances 0.000 claims abstract description 13
- 230000001681 protective effect Effects 0.000 claims abstract description 11
- 239000003638 chemical reducing agent Substances 0.000 claims abstract description 10
- 229920002994 synthetic fiber Polymers 0.000 claims abstract description 9
- 239000012209 synthetic fiber Substances 0.000 claims abstract description 9
- 229910052751 metal Inorganic materials 0.000 claims abstract description 7
- 239000002184 metal Substances 0.000 claims abstract description 7
- 239000013067 intermediate product Substances 0.000 claims description 20
- 239000000047 product Substances 0.000 claims description 20
- 229910000831 Steel Inorganic materials 0.000 claims description 9
- 239000010959 steel Substances 0.000 claims description 9
- 230000035515 penetration Effects 0.000 claims description 8
- 238000004140 cleaning Methods 0.000 claims description 6
- 238000009415 formwork Methods 0.000 claims description 6
- 238000002156 mixing Methods 0.000 claims description 6
- 238000000465 moulding Methods 0.000 claims description 6
- 235000011837 pasties Nutrition 0.000 claims description 6
- 238000005507 spraying Methods 0.000 claims description 6
- 238000003756 stirring Methods 0.000 claims description 6
- 238000005406 washing Methods 0.000 claims description 6
- 239000004372 Polyvinyl alcohol Substances 0.000 claims description 5
- 239000011398 Portland cement Substances 0.000 claims description 5
- 229920002451 polyvinyl alcohol Polymers 0.000 claims description 5
- 239000004743 Polypropylene Substances 0.000 claims description 4
- -1 polypropylene Polymers 0.000 claims description 4
- 229920001155 polypropylene Polymers 0.000 claims description 4
- 239000002253 acid Substances 0.000 claims description 3
- 238000000034 method Methods 0.000 claims description 3
- 229920002239 polyacrylonitrile Polymers 0.000 claims description 3
- 239000010881 fly ash Substances 0.000 claims description 2
- 229920000728 polyester Polymers 0.000 claims description 2
- 229910021487 silica fume Inorganic materials 0.000 claims description 2
- 239000002893 slag Substances 0.000 claims description 2
- 239000012467 final product Substances 0.000 claims 2
- 230000004888 barrier function Effects 0.000 claims 1
- 238000009413 insulation Methods 0.000 abstract description 13
- 230000000694 effects Effects 0.000 abstract description 4
- 238000004321 preservation Methods 0.000 abstract description 4
- 230000008901 benefit Effects 0.000 abstract description 3
- 239000000428 dust Substances 0.000 abstract description 2
- 239000002994 raw material Substances 0.000 abstract description 2
- 239000012043 crude product Substances 0.000 description 11
- 238000012360 testing method Methods 0.000 description 10
- 238000010521 absorption reaction Methods 0.000 description 3
- 238000000889 atomisation Methods 0.000 description 3
- KRKNYBCHXYNGOX-UHFFFAOYSA-N citric acid Chemical compound OC(=O)CC(O)(C(O)=O)CC(O)=O KRKNYBCHXYNGOX-UHFFFAOYSA-N 0.000 description 3
- 238000010998 test method Methods 0.000 description 3
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- 239000004576 sand Substances 0.000 description 2
- 235000019832 sodium triphosphate Nutrition 0.000 description 2
- 238000007655 standard test method Methods 0.000 description 2
- AEQDJSLRWYMAQI-UHFFFAOYSA-N 2,3,9,10-tetramethoxy-6,8,13,13a-tetrahydro-5H-isoquinolino[2,1-b]isoquinoline Chemical compound C1CN2CC(C(=C(OC)C=C3)OC)=C3CC2C2=C1C=C(OC)C(OC)=C2 AEQDJSLRWYMAQI-UHFFFAOYSA-N 0.000 description 1
- RGHNJXZEOKUKBD-SQOUGZDYSA-M D-gluconate Chemical compound OC[C@@H](O)[C@@H](O)[C@H](O)[C@@H](O)C([O-])=O RGHNJXZEOKUKBD-SQOUGZDYSA-M 0.000 description 1
- 229910019142 PO4 Inorganic materials 0.000 description 1
- 239000011358 absorbing material Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000003153 chemical reaction reagent Substances 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 239000002657 fibrous material Substances 0.000 description 1
- 229940050410 gluconate Drugs 0.000 description 1
- 239000012774 insulation material Substances 0.000 description 1
- 238000002955 isolation Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 239000011664 nicotinic acid Substances 0.000 description 1
- NBIIXXVUZAFLBC-UHFFFAOYSA-K phosphate Chemical compound [O-]P([O-])([O-])=O NBIIXXVUZAFLBC-UHFFFAOYSA-K 0.000 description 1
- 239000010452 phosphate Substances 0.000 description 1
- 239000000176 sodium gluconate Substances 0.000 description 1
- 235000012207 sodium gluconate Nutrition 0.000 description 1
- 229940005574 sodium gluconate Drugs 0.000 description 1
- 238000011179 visual inspection Methods 0.000 description 1
Classifications
-
- 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
- C04B14/38—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
- C04B16/00—Use of organic materials as fillers, e.g. pigments, for mortars, concrete or artificial stone; Treatment of organic materials specially adapted to enhance their filling properties in mortars, concrete or artificial stone
- C04B16/04—Macromolecular compounds
- C04B16/06—Macromolecular compounds fibrous
- C04B16/0616—Macromolecular compounds fibrous from polymers obtained by reactions only involving carbon-to-carbon unsaturated bonds
- C04B16/0625—Polyalkenes, e.g. polyethylene
- C04B16/0633—Polypropylene
-
- 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
- C04B16/00—Use of organic materials as fillers, e.g. pigments, for mortars, concrete or artificial stone; Treatment of organic materials specially adapted to enhance their filling properties in mortars, concrete or artificial stone
- C04B16/04—Macromolecular compounds
- C04B16/06—Macromolecular compounds fibrous
- C04B16/0616—Macromolecular compounds fibrous from polymers obtained by reactions only involving carbon-to-carbon unsaturated bonds
- C04B16/0641—Polyvinylalcohols; Polyvinylacetates
-
- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04B—GENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
- E04B1/00—Constructions in general; Structures which are not restricted either to walls, e.g. partitions, or floors or ceilings or roofs
- E04B1/62—Insulation or other protection; Elements or use of specified material therefor
- E04B1/74—Heat, sound or noise insulation, absorption, or reflection; Other building methods affording favourable thermal or acoustical conditions, e.g. accumulating of heat within walls
- E04B1/88—Insulating elements for both heat and sound
- E04B1/90—Insulating elements for both heat and sound slab-shaped
-
- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04H—BUILDINGS OR LIKE STRUCTURES FOR PARTICULAR PURPOSES; SWIMMING OR SPLASH BATHS OR POOLS; MASTS; FENCING; TENTS OR CANOPIES, IN GENERAL
- E04H17/00—Fencing, e.g. fences, enclosures, corrals
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/52—Sound-insulating materials
-
- 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
- C04B2201/30—Mortars, concrete or artificial stone characterised by specific physical values for heat transfer properties such as thermal insulation values, e.g. R-values
- C04B2201/32—Mortars, concrete or artificial stone characterised by specific physical values for heat transfer properties such as thermal insulation values, e.g. R-values for the thermal conductivity, e.g. K-factors
-
- 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
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Structural Engineering (AREA)
- Architecture (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Civil Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Acoustics & Sound (AREA)
- Inorganic Chemistry (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
The invention discloses an exposed fiber concrete material which comprises the following components in percentage by mass: 14.9 to 38.9 percent of cement, 0 to 21.7 percent of admixture, 48.3 to 71.7 percent of fine aggregate, 0.25 to 0.73 percent of synthetic fiber, 0.3 to 0.53 percent of water reducing agent and the balance of water or 14.9 to 38.9 percent of cement, 0 to 21.9 percent of admixture, 48.3 to 71.7 percent of fine aggregate, 3.55 to 9.13 percent of metal fiber, 0.3 to 0.53 percent of water reducing agent and the balance of water. The exposed fiber concrete material is used in the field of protective walls and protective fence nets, and has more excellent protective effect; the sound insulation board is used in the field of sound insulation boards, can achieve excellent sound insulation effect, and can absorb dust and play a certain protection role; the fiber has the heat preservation function, so that the whole structure has a good heat preservation function; the preparation process of the exposed fiber concrete is simple, the raw materials are easy to obtain, and the economic benefit is high.
Description
Technical Field
The invention belongs to the technical field of concrete, and relates to an exposed fiber concrete material and a preparation method thereof.
Background
Concrete is currently the most widely used civil engineering material. Although the compressive strength of concrete is generally high, its tensile properties have been relatively weak. Poor tensile properties can lead to the concrete being prone to cracking, thereby reducing the durability of the concrete and the like, and preventing the structure from reaching the target life. The addition of fibrous materials to concrete to form fibrous concrete materials has been shown to be effective in increasing the tensile strength of concrete.
At present, the fiber plays a bridging role in concrete, can improve the mechanical property of the concrete to a certain extent, and can effectively improve the durability of the concrete. The bionic design principle is adopted, the fibers are exposed on the surface of the concrete board, and the heat insulation performance, the sound insulation performance or the protective performance of the board can be effectively improved by selecting different fiber types, but the application research on exposed fiber concrete materials is lacked at present.
Therefore, a related technical solution is needed to fill the research gap in this field.
Disclosure of Invention
It has been shown that different types of fibres can be used to give different applications to open fibre concrete materials. For example, the exposed steel fiber concrete can play a role in protection because the surface of the exposed steel fiber concrete is fully distributed with steel fibers, and can be used as a protective net in places such as prisons. When the fiber in the exposed fiber concrete is polyvinyl alcohol fiber or polyacrylonitrile fiber, the concrete material has sound insulation effect and can be used as a sound insulation board.
The invention aims to disclose an exposed fiber concrete material, wherein fibers are exposed on the surface of the exposed fiber concrete material, and the exposed fiber concrete material comprises the following components in percentage by mass:
the average length of the fibers exposed from the surface of the fiber-exposed concrete material is 10-20mm.
The invention also aims to disclose a fiber-exposed concrete material, wherein fibers are exposed on the surface of the fiber-exposed concrete material, and the fiber-exposed concrete material comprises the following components in percentage by mass:
the average length of the fibers exposed from the surface of the fiber-exposed concrete material is 10-35mm.
Furthermore, the fluidity of the exposed fiber concrete material is more than or equal to 160mm.
Further, the cement is portland cement or ordinary portland cement.
Further, the admixture comprises one or more of fly ash, silica fume and slag micropowder.
Further, the water reducing agent is a polycarboxylic acid water reducing agent, and the water reducing rate is 30-40%.
Further, the synthetic fiber is selected from one or more of polyvinyl alcohol fiber, polyacrylonitrile fiber, polyester fiber and polypropylene fiber, the length of the synthetic fiber is 25-35mm, and the diameter of the synthetic fiber is more than 0.03 mm.
Furthermore, the metal fiber is steel fiber, the length of the metal fiber is 35-45mm, and the diameter of the metal fiber is 0.2-1.0mm.
Further, the retarder is selected from one or more of phosphate, gluconate and citric acid.
The invention also aims to disclose a preparation method of the exposed fiber concrete material, which comprises the following steps:
s1, uniformly mixing fine aggregate, cement and an admixture, adding fibers, stirring to be pasty, pouring into a mold, and molding to obtain a coarse product;
s2, leveling the coarse product, spraying a retarder on the surface of the coarse product, and vibrating the coarse product after the retarder penetrates through the surface of the concrete to reach a preset penetration depth;
s3, when the internal concrete reaches a final setting state, removing the formwork to obtain a concrete intermediate product;
s4, washing the concrete intermediate product to enable the fibers to be exposed out of the concrete intermediate product in a specified length;
and S5, standing and cleaning the concrete intermediate product to obtain the product.
Further, in step S2, the predetermined penetration depth is 10-20mm.
Further, in step S4, the specified length is equal to or more than 15mm.
The invention also aims to disclose the application of the exposed fiber concrete material in the aspects of protecting walls, protective railings, sound insulation boards and the like.
The invention has the following beneficial effects:
(1) When the fiber is steel fiber, the exposed fiber concrete disclosed by the invention is used in the field of protective walls and protective fence nets, and has a more excellent protective effect.
(2) When the fiber is synthetic fiber, the exposed fiber concrete is used in the field of sound insulation boards, and the synthetic fiber forms a fiber layer on the surface of the exposed fiber concrete, so that the exposed fiber concrete not only has excellent sound insulation effect, but also can absorb dust and play a certain protection role.
(3) For the exposed fiber concrete, the fiber of the exposed fiber concrete has a heat preservation function, so that the whole structure has a good heat preservation function.
(4) The preparation method of the exposed fiber concrete based on the invention has the advantages of simple preparation process, easily obtained raw materials and high economic benefit.
Detailed Description
In order to more clearly illustrate the technical solution of the present invention, the following examples are given, but the present invention is not limited thereto.
The experimental methods used in the following examples are all conventional methods unless otherwise specified; reagents, materials and the like used in the following examples are commercially available unless otherwise specified.
Examples of the invention
The testing method of the fluidity of the exposed fiber concrete material is carried out according to JGJ/T70-2009.
The cement is Portland cement, and the strength grade is 42.5;
the type of the fine aggregate is natural sand, wherein the mud content of the natural sand is less than or equal to 3wt%, and the fineness modulus is about 2.2-3.2;
the type of the water reducing agent is a polycarboxylic acid liquid water reducing agent.
Example 1
The fiber-exposed concrete material is characterized in that fibers are exposed on the surface of the fiber-exposed concrete material, and the fiber-exposed concrete material comprises the following components in percentage by mass:
the average length of the fibers exposed from the surface of the fiber-exposed concrete material was 17mm.
Wherein the diameter of the steel fiber is 0.2mm, and the length is 35mm;
the fluidity of the exposed fiber concrete material was 200mm.
The preparation method of the exposed fiber concrete material comprises the following steps:
s1, uniformly mixing the fine aggregate, cement and admixture according to the mass fraction, adding steel fiber, stirring to be pasty, pouring into a mold, and molding to obtain a crude product;
s2, leveling the coarse product by using a tool, uniformly spraying a sodium gluconate retarder on the surface of the coarse product in a high-pressure atomization mode, and vibrating the coarse product in the whole mould to compact the coarse product after the retarder penetrates the surface of the concrete to reach a preset penetration depth (20 mm);
s3, after the internal concrete reaches a final setting state, removing the formwork to obtain a concrete intermediate product;
s4, washing the concrete intermediate product with a high-pressure water gun to enable the fibers to be exposed to a specified length (the average length is about 17 mm);
s5, standing for 2 days, and cleaning the surface of the concrete intermediate product by using a brush to obtain the product exposed fiber concrete material.
Example 2
The fiber-exposed concrete material is characterized in that fibers are exposed on the surface of the fiber-exposed concrete material, and the fiber-exposed concrete material comprises the following components in percentage by mass:
the average length of the fibers exposed from the surface of the fiber-exposed concrete material was 15mm.
Wherein the diameter of the polypropylene fiber is 0.035mm, and the length is 25mm;
the fluidity of the exposed fiber concrete material was 198mm.
The preparation method of the exposed fiber concrete material comprises the following steps:
s1, uniformly mixing the fine aggregate, cement and admixture according to the mass fraction, adding polypropylene fiber, stirring to be pasty, pouring into a mold, and molding to obtain a crude product;
s2, leveling the crude product by using a tool, uniformly spraying a sodium tripolyphosphate retarder on the surface of the crude product in a high-pressure atomization mode, and vibrating the crude product in the whole mould to compact the crude product after the retarder penetrates the surface of the concrete to reach a preset penetration depth (20 mm);
s3, after the internal concrete reaches a final setting state, removing the formwork to obtain a concrete intermediate product;
s4, washing the concrete intermediate product with a high-pressure water gun to enable the fibers to be exposed to a specified length (the average length is about 15 mm);
s5, standing for 1 day, and cleaning the surface of the concrete intermediate product by using a hairbrush to obtain the product exposed fiber concrete material.
Example 3
The fiber-exposed concrete material is characterized in that fibers are exposed on the surface of the fiber-exposed concrete material, and the fiber-exposed concrete material comprises the following components in percentage by mass:
the average length of the fibers exposed from the surface of the fiber-exposed concrete material was 15mm.
Wherein, the diameter of the polyvinyl alcohol fiber is 0.3mm, and the length is 30mm;
the fluidity of the open fiber concrete material was 179mm.
The preparation method of the exposed fiber concrete material comprises the following steps:
s1, uniformly mixing the fine aggregate, cement and an admixture according to the mass fraction, adding polyvinyl alcohol fiber, stirring to be pasty, pouring into a mold, and molding to obtain a crude product;
s2, leveling the crude product by using a tool, uniformly spraying a sodium tripolyphosphate retarder on the surface of the crude product in a high-pressure atomization mode, and vibrating the crude product in the whole mould to compact the crude product after the retarder penetrates the surface of the concrete to reach a preset penetration depth (20 mm);
s3, after the internal concrete reaches a final setting state, removing the formwork to obtain a concrete intermediate product;
s4, washing the concrete intermediate product with a high-pressure water gun to enable the fibers to be exposed to a specified length (the average length is about 15 mm);
s5, standing for 1 day, and cleaning the surface of the concrete intermediate product by using a brush to obtain the product exposed fiber concrete material.
Test example
The exposed fiber concrete material obtained in example 1 was used for the test of the protection board.
The test method comprises the following steps: visual inspection was carried out.
The test results are: the steel fibers on the surface of the wall body are uniformly distributed and protrude out of the wall body in a spine shape, so that the effective isolation effect is achieved.
The fiber-exposed concrete material obtained in example 2 was used for the test of acoustical panels.
The test method comprises the following steps: according to section 1 of measurement of sound absorption coefficient and sound impedance in an acoustic impedance tube: the sound absorption coefficient of the sound absorbing material is tested by a standard test method of standing wave ratio method (GB/T18696.1).
The test results are as follows: the sound absorption coefficient of the soundproof panel was 60%.
The exposed fiber concrete material obtained in the embodiment 3 is used for testing the insulation board.
The test method comprises the following steps: and testing the heat conductivity coefficient of the heat insulation board according to a standard test method of steady-state thermal resistance of the heat insulation material and related testing heat protection board method (GB/T10294-2008).
The test results are: the thermal conductivity of the insulation board is 0.43W/m.k.
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 specification describes embodiments, not every embodiment includes only a single embodiment, and such description is for clarity purposes only, and it is to be understood that all embodiments may be combined as appropriate by one of ordinary skill in the art to form other embodiments as will be apparent to those of skill in the art from the description herein.
Claims (9)
1. The fiber-exposed concrete material is characterized in that fibers are exposed on the surface of the fiber-exposed concrete material, and the fiber-exposed concrete material comprises the following components in percentage by mass:
cement 14.9-38.9%
0 to 21.7 percent of admixture
48.3 to 71.7 percent of fine aggregate
Synthetic fiber 0.25-0.73%
0.3 to 0.53 percent of water reducing agent
The balance of water;
the average length of the fibers exposed from the surface of the fiber-exposed concrete material is 10-20 mm;
the preparation method of the exposed fiber concrete material comprises the following steps:
s1, uniformly mixing fine aggregate, cement and an admixture, adding fibers, stirring to be pasty, then pouring into a mold, and molding to obtain a coarse product;
s2, leveling the coarse product, spraying a retarder on the surface of the coarse product, and vibrating the coarse product after the retarder penetrates the surface of the concrete to reach a preset penetration depth;
s3, after the internal concrete reaches a final set state, removing the formwork to obtain a concrete intermediate product;
s4, washing the concrete intermediate product to enable the fibers to be exposed out of the concrete intermediate product in a specified length;
s5, standing and cleaning the concrete intermediate product to obtain a final product.
2. The exposed fiber concrete material is characterized in that fibers are exposed on the surface of the exposed fiber concrete material, and the exposed fiber concrete material comprises the following components in percentage by mass:
cement 14.9-38.9%
0 to 21.9 percent of admixture
48.3 to 71.7 percent of fine aggregate
Metal fiber 3.55-9.13%
0.3 to 0.53 percent of water reducing agent
The balance of water;
the average length of the fibers exposed from the surface of the fiber-exposed concrete material is 10-35 mm;
the preparation method of the exposed fiber concrete material comprises the following steps:
s1, uniformly mixing fine aggregate, cement and an admixture, adding fibers, stirring to be pasty, then pouring into a mold, and molding to obtain a coarse product;
s2, leveling the coarse product, spraying a retarder on the surface of the coarse product, and vibrating the coarse product after the retarder penetrates the surface of the concrete to reach a preset penetration depth;
s3, after the internal concrete reaches a final set state, removing the formwork to obtain a concrete intermediate product;
s4, washing the concrete intermediate product to enable the fibers to be exposed to the specified length;
s5, standing and cleaning the concrete intermediate product to obtain a final product.
3. The fiber-exposed concrete material according to claim 1, wherein the fluidity of the fiber-exposed concrete material is not less than 160mm.
4. The fiber-exposed concrete material according to claim 1, wherein the cement is portland cement or ordinary portland cement.
5. The exposed fiber concrete material according to claim 1, wherein the admixture comprises one or more of fly ash, silica fume and slag micropowder; the water reducing agent is a polycarboxylic acid water reducing agent, and the water reducing rate is 30-40%.
6. The fiber-exposed concrete material according to claim 1, wherein the synthetic fibers are selected from one or more of polyvinyl alcohol fibers, polyacrylonitrile fibers, polyester fibers and polypropylene fibers, and the synthetic fibers have a length of 25-35mm and a diameter of 0.03mm or more.
7. The exposed fiber concrete material according to claim 2, wherein the metal fibers are steel fibers,
the length of the metal fiber is 35-45mm, and the diameter is 0.2-1.0mm.
8. The method for preparing the fiber-exposed concrete material according to claim 1, wherein in the step S2, the predetermined penetration depth is 10-20 mm;
in step S4, the specified length is more than or equal to 10 mm.
9. Use of the exposed fiber concrete material according to any one of claims 1 to 7 for protective walls, protective barriers and acoustic panels.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111392055.8A CN113979694B (en) | 2021-11-19 | 2021-11-19 | Exposed fiber concrete material and preparation method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111392055.8A CN113979694B (en) | 2021-11-19 | 2021-11-19 | Exposed fiber concrete material and preparation method thereof |
Publications (2)
| Publication Number | Publication Date |
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| CN113979694A CN113979694A (en) | 2022-01-28 |
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