CN116730689B - Basalt fiber reinforced coral sand concrete and preparation method thereof - Google Patents
Basalt fiber reinforced coral sand concrete and preparation method thereof Download PDFInfo
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- CN116730689B CN116730689B CN202310999960.2A CN202310999960A CN116730689B CN 116730689 B CN116730689 B CN 116730689B CN 202310999960 A CN202310999960 A CN 202310999960A CN 116730689 B CN116730689 B CN 116730689B
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- 239000004567 concrete Substances 0.000 title claims abstract description 144
- 239000004576 sand Substances 0.000 title claims abstract description 127
- 235000014653 Carica parviflora Nutrition 0.000 title claims abstract description 118
- 241000243321 Cnidaria Species 0.000 title claims abstract description 118
- 229920002748 Basalt fiber Polymers 0.000 title claims abstract description 100
- 238000002360 preparation method Methods 0.000 title claims abstract description 20
- 238000003756 stirring Methods 0.000 claims abstract description 56
- 239000013535 sea water Substances 0.000 claims abstract description 53
- 239000000463 material Substances 0.000 claims abstract description 40
- 239000010881 fly ash Substances 0.000 claims abstract description 29
- 239000000843 powder Substances 0.000 claims abstract description 29
- 239000002893 slag Substances 0.000 claims abstract description 29
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 29
- 229920005646 polycarboxylate Polymers 0.000 claims abstract description 28
- 239000004568 cement Substances 0.000 claims abstract description 27
- 238000002156 mixing Methods 0.000 claims abstract description 27
- 239000002002 slurry Substances 0.000 claims abstract description 22
- 239000003638 chemical reducing agent Substances 0.000 claims abstract description 15
- 239000000203 mixture Substances 0.000 claims description 20
- 239000008030 superplasticizer Substances 0.000 claims description 14
- 238000000034 method Methods 0.000 claims description 10
- 239000002994 raw material Substances 0.000 claims description 7
- 239000011398 Portland cement Substances 0.000 claims description 4
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 claims description 4
- -1 mgCl 2 ·6H 2 O Substances 0.000 claims description 4
- 239000002245 particle Substances 0.000 claims description 4
- 229910004298 SiO 2 Inorganic materials 0.000 claims description 3
- 239000007787 solid Substances 0.000 claims description 3
- 239000011780 sodium chloride Substances 0.000 claims description 2
- 230000007797 corrosion Effects 0.000 abstract description 8
- 238000005260 corrosion Methods 0.000 abstract description 8
- 238000010257 thawing Methods 0.000 abstract description 6
- 239000002253 acid Substances 0.000 abstract 1
- 229920000049 Carbon (fiber) Polymers 0.000 description 11
- 239000004917 carbon fiber Substances 0.000 description 11
- 238000012360 testing method Methods 0.000 description 11
- 239000011159 matrix material Substances 0.000 description 10
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 8
- 238000001878 scanning electron micrograph Methods 0.000 description 8
- 239000000835 fiber Substances 0.000 description 7
- 239000003469 silicate cement Substances 0.000 description 7
- 230000003068 static effect Effects 0.000 description 7
- 230000006835 compression Effects 0.000 description 6
- 238000007906 compression Methods 0.000 description 6
- 238000012669 compression test Methods 0.000 description 6
- 238000009736 wetting Methods 0.000 description 6
- 239000002131 composite material Substances 0.000 description 5
- 230000007547 defect Effects 0.000 description 5
- 238000012423 maintenance Methods 0.000 description 5
- 239000004566 building material Substances 0.000 description 4
- 230000000052 comparative effect Effects 0.000 description 4
- 238000010276 construction Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 238000006703 hydration reaction Methods 0.000 description 4
- 230000008569 process Effects 0.000 description 4
- 230000007704 transition Effects 0.000 description 4
- 239000004743 Polypropylene Substances 0.000 description 3
- 230000003628 erosive effect Effects 0.000 description 3
- 230000036571 hydration Effects 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 229920001155 polypropylene Polymers 0.000 description 3
- 230000002829 reductive effect Effects 0.000 description 3
- 239000000126 substance Substances 0.000 description 3
- 239000011374 ultra-high-performance concrete Substances 0.000 description 3
- 230000008901 benefit Effects 0.000 description 2
- 239000011210 fiber-reinforced concrete Substances 0.000 description 2
- 230000001965 increasing effect Effects 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- 239000004575 stone Substances 0.000 description 2
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 150000003841 chloride salts Chemical class 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 230000002708 enhancing effect Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 239000013505 freshwater Substances 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 229910052500 inorganic mineral Inorganic materials 0.000 description 1
- 230000010220 ion permeability Effects 0.000 description 1
- 230000000670 limiting effect Effects 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 239000011707 mineral Substances 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 239000012779 reinforcing material Substances 0.000 description 1
- 238000012216 screening Methods 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 230000003245 working effect Effects 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
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/20—Resistance against chemical, physical or biological attack
-
- 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
- C04B2111/20—Resistance against chemical, physical or biological attack
- C04B2111/24—Sea water resistance
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
- C04B2201/50—Mortars, concrete or artificial stone characterised by specific physical values for the mechanical strength
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/91—Use of waste materials as fillers for mortars or concrete
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic 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 basalt fiber reinforced coral sand concrete and a preparation method thereof, wherein the basalt fiber reinforced coral sand concrete comprises 220-260 parts of cement, 182-202 parts of fly ash, 38-58 parts of slag powder, 518-538 parts of coral sand, 114.8-134.8 parts of seawater, 0.40-1.2 parts of polycarboxylate water reducer and 2.11-8.44 parts of basalt fiber. The preparation method comprises the steps of mixing cement, fly ash and slag powder into a cementing material, stirring with 2/3 seawater, stirring with a polycarboxylic acid water reducer and 1/3 seawater to obtain a cementing slurry, mixing basalt fibers and coral sand, stirring, blending into the cementing slurry, pouring into a mould, and curing to obtain the concrete. The concrete has excellent impact toughness, freeze-thawing corrosion resistance, corrosion resistance and durability, and can ensure the safety and reliability of building structures while having good workability.
Description
Technical Field
The invention relates to the technical field of concrete, in particular to basalt fiber reinforced coral sand concrete and a preparation method thereof.
Background
The structures of the island region are eroded by seawater, the impact of sea waves and the erosion of sea wind, so that the building materials (such as concrete) used in the island engineering construction are required to have stronger mechanical properties (particularly impact resistance), permeation resistance and corrosion resistance than the common building materials, and the dynamic mechanical properties of the building materials are also required to be considered. In island engineering construction, the sea water is used for preparing the coral sand cement-based composite material, so that the engineering cost can be reduced to a great extent, the dependence on building materials is reduced, and the method has important engineering practical value, but the brittleness of the coral sand is high, so that the concrete strength can be negatively influenced.
In order to fully utilize sea water and sea sand resources, a large number of students research sea water and sea sand concrete, wherein coarse aggregate is common broken stone, and the research shows that sea water and sea sand contain more chloride salt, which can influence the hydration process of cement, has influence on the strength, working performance, durability and the like of the concrete, and the mechanical properties of the sea water and sea sand concrete are different from those of common concrete. The polypropylene fiber reinforced concrete is prepared by Alhozaimy and the like, and the bending toughness and the impact mechanical property of the polypropylene fiber reinforced concrete are studied. The test result shows that the addition of polypropylene fiber has less influence on the compressive strength and the flexural strength of concrete. The Sorousan and the like carry out freeze-thawing durability tests on carbon fiber reinforced cement-based composite materials prepared by different carbon fiber contents and different aggregate contents, and test results show that the freeze-thawing durability of the composite materials shows a rule of increasing and then decreasing with the continuous increase of the carbon fiber doping amount and the aggregate content, and negative effects can be generated on the durability of the composite materials after the carbon fiber doping amount and the aggregate content are increased to a certain extent. In addition, zhu Deju and the like analyze the mechanical property influence factors of the seawater sea sand ultra-high performance concrete without the coarse aggregate through experiments, and find that the steel fiber has obvious effect of improving the mechanical property of the seawater sea sand ultra-high performance concrete, but only improves the compressive strength influence, and the impact toughness, corrosion resistance, ductility and durability effects of the seawater sea sand ultra-high performance concrete are still to be discussed.
Disclosure of Invention
The basalt fiber reinforced coral sand concrete and the preparation method thereof solve the technical problems of overcoming the defects of the prior art, and provide basalt fiber reinforced coral sand concrete which can improve the impact toughness, the freeze-thawing corrosion resistance and the corrosion resistance of concrete, effectively prolong the service life of the concrete and improve the durability of the concrete in a marine environment.
In order to solve the technical problems, the invention provides the following scheme.
The basalt fiber reinforced coral sand concrete is prepared from the following raw materials: 220 to 260 parts of cement, 182 to 202 parts of fly ash, 38 to 58 parts of slag powder, 518 to 538 parts of coral sand, 114.8 to 134.8 parts of sea water, 0.40 to 1.2 parts of polycarboxylate superplasticizer and 2.11 to 8.44 parts of basalt fiber.
The basalt fiber reinforced coral sand concrete is characterized in that the particle size of the coral sand is preferably 0.15-2.36 mm, and the fineness modulus of the coral sand is preferably 1.88-2.03.
The basalt fiber reinforced coral sand concrete preferably has an elastic modulus of 91GPa to 110GPa, a nominal length of 10mm and a density of 2.63g/cm 3 ～2.65g/cm 3 The diameter of the monofilament is 7-15 mu m, and the breaking strength is more than 2000MPa.
In the basalt fiber reinforced coral sand concrete, preferably, the solid content of the polycarboxylate water reducer is 50%, the water reducing rate is 28%, and the mass of the polycarboxylate water reducer is 0.2% of the total mass of cement, fly ash and slag powder.
Preferably, the basalt fiber reinforced coral sand concrete is Portland cement, and the fly ash has a specific surface area of 1300m 2 Per kg, loss on ignition 2.8%, density 2.55g/cm 3 、SiO 2 Fly ash with 45.1 percent of content, 0.85 percent of water content and 16 percent of fineness, wherein the slag powder is characterized in that the specific surface area is 628m 2 Per kg, density 2.93g/cm 3 Slag powder with loss on ignition of 0.96% and water content of 0.4%.
Preferably, the basalt fiber reinforced coral sand concrete is artificial seawater, wherein the artificial seawater comprises NaCl and MgCl 2 ·6H 2 O、Na 2 SO 4 、CaCl 2 、KCl、NaHCO 3 KBr and water.
The invention also provides a preparation method of the basalt fiber reinforced coral sand concrete, which comprises the following steps:
(1) Mixing and stirring cement, fly ash and slag powder to obtain a cementing material;
(2) Firstly, mixing and stirring a cementing material and 2/3 seawater, then adding a polycarboxylate water reducer and 1/3 seawater, and continuously stirring to obtain a gelatinous slurry;
(3) Mixing basalt fibers and coral sand, uniformly stirring to uniformly disperse the basalt fibers in the coral sand to obtain a mixture, and fully blending the mixture into the gelatinous slurry obtained in the step (2) for stirring to obtain a concrete material;
(4) Pouring the obtained concrete material into a mould, and curing to obtain basalt fiber reinforced coral sand concrete.
In the preparation method of basalt fiber reinforced coral sand concrete, preferably, in the step (1), the stirring time is 1-3 min; in the step (2), the stirring time is 2-3 min, and the continuous stirring time is 2-3 min; in the step (3), the stirring time is 3-4 min.
In the preparation method of basalt fiber reinforced coral sand concrete, preferably, in the step (3), the coral sand is pre-wetted before mixing.
As a general inventive concept, the invention also provides the basalt fiber reinforced coral sand concrete or the application of the basalt fiber reinforced coral sand concrete prepared by the preparation method in the field of ocean engineering.
In the invention, the water-gel ratio is the mass ratio of the seawater to the cementing material.
Compared with the prior art, the invention has the advantages that:
1. according to the basalt fiber reinforced coral sand concrete, the basalt fiber, the coral sand, the polycarboxylate water reducer and the like are cooperated with the raw materials and the proportions thereof, so that the impact toughness, the freeze-thawing corrosion resistance and the corrosion resistance of the concrete are effectively improved, the service life of the concrete can be prolonged, the durability of the concrete in a marine environment can be improved, and the application range of the concrete in the marine field is widened. The invention takes coral sand in sea water as raw material, and can be locally obtained in the construction process of ocean engineering, thereby not only reducing the cost of raw material, but also reducing the cost of fresh water and sand transported from inland, but the use of coral sand as fine aggregate can cause more defects such as microcracks and micro-cavities in test blocks, so that the tensile strength, the impact strength are low, the property is brittle, the damage and the fragile area of concrete are often interface transition areas between cement paste and aggregate, the applicant finds that the basalt fiber is doped to improve the strength of microstructure in the interface transition areas, reduce the defects in the concrete, improve the compactness and the integrity of the concrete, obviously improve the impact toughness of the concrete, solve the adverse effect on the concrete strength caused by the large brittleness of coral sand, and ensure the safety and the reliability of the building structure while the obtained concrete has good working property. Different basalt fiber doping amounts have obvious influence on the dynamic impact characteristics of concrete, and the proper basalt fiber doping amounts can effectively reduce the damage and deterioration of the concrete. The synergy of the coral sand and the basalt fiber can also obviously improve the anti-freeze-thawing erosion capability of the concrete under the corrosive condition, and effectively prolong the service life of the concrete.
2. The polycarboxylate water reducer is adopted in the basalt fiber reinforced coral sand concrete, so that the mixture has good working performance under the condition of extremely low water-cement ratio (the water-cement ratio of common concrete is usually between 0.35 and 0.6, and the water-cement ratio of the invention is between 0.22 and 0.3), and the concrete with excellent mechanical property, ductility and durability meeting the structural requirement is obtained.
3. The basalt fiber reinforced coral sand concrete is also added with the cementing materials such as slag powder, fly ash and the like, so that the strength of the microstructure of the interface transition area can be improved to a certain extent, the durability and the long-term strength of the concrete are enhanced, meanwhile, coarse aggregates such as broken stone and the like commonly used in the existing concrete materials are removed, the coral sand is adopted as fine aggregates, the compactness and the integrity of the concrete are improved after the basalt fiber is doped, and the defects in the concrete are reduced, so that the strength and the durability of the concrete can be obviously improved by multi-raw material cooperation, and the concrete can be more suitable for marine environments.
4. According to the preparation method, the high-quality mineral admixture or the composite admixture is reasonably mixed by screening and proportioning control of raw materials and optimizing and control of a construction process, and the coral sand fine aggregate is used for locally obtaining materials and reducing cost, but the defects of microcracks, micro holes and the like in a test block are more, the strength of a microstructure in an interface transition area is improved by mixing basalt fibers, the impact toughness of concrete can be obviously improved, the problems of low tensile strength and brittle nature of coral sand cement-based materials are solved, and the adoption of the polycarboxylate water reducer can ensure that the mixture has good working performance under the condition of extremely low water-cement ratio, so that the concrete with excellent mechanical property, ductility and durability meeting the structural requirements is obtained. The invention adopts a fiber post-doping method, which promotes the fiber to be dispersed more uniformly in the concrete.
5. The basalt fiber reinforced coral sand concrete can be applied to the field of ocean engineering, solves the problem of impact toughness of common concrete in ocean environment, and has higher economic benefit in ocean engineering.
Drawings
Fig. 1 is an SEM image of the connection of coral sand to a concrete matrix in basalt fiber reinforced coral sand concrete of example 2.
Fig. 2 is an SEM image of the connection of basalt fiber end portions to a concrete matrix in the basalt fiber-reinforced coral sand concrete of example 2.
Fig. 3 is an SEM image of three-dimensional skeleton bridging of basalt fiber in basalt fiber reinforced coral sand concrete of example 2.
Fig. 4 is an SEM image of basalt fiber breakage in basalt fiber reinforced coral sand concrete of example 2.
Detailed Description
The invention is further described below in connection with the drawings and the specific preferred embodiments, but the scope of protection of the invention is not limited thereby. The materials and instruments used in the examples below are all commercially available.
In the following examples:
the cement is PO42.5 silicate cement produced by Yang Chun mountain and water cement Co., ltd. In all cities, and the fly ash is specific surface area 1300m 2 Per kg, loss on ignition 2.8%, density 2.55g/cm 3 、SiO 2 Fly ash with 45.1 percent of content, 0.85 percent of water content and 16 percent of fineness, and slag powder with specific surface area of 628m 2 Per kg, density 2.93g/cm 3 Slag powder with loss on ignition of 0.96% and water content of 0.4%.
The coral sand is used as fine aggregate of concrete, the particle size of the coral sand is 0.15 mm-2.36 mm, the fineness modulus is 1.88-2.03, and the coral sand is classified as fine sand.
The elastic modulus of basalt fiber is 91-110 GPa, the nominal length is 10mm, and the density is 2.64g/cm 3 （2.63g/cm 3 ～2.65g/cm 3 All can be used), the diameter of the monofilament is 7-15 mu m, and the breaking strength is more than 2000MPa. The invention uses basalt fiber as reinforcing material, which can effectively improve the compressive strength of concrete, improve the compressive and crack resistance of concrete, and increase the ductility and durability of coral sand concrete.
The solid content of the polycarboxylate water reducer is 50%, the water reducing rate is 28%, and the mass of the polycarboxylate water reducer is 0.2% of the total mass of cement, fly ash and slag powder. The invention utilizes the polycarboxylate water reducer to improve the workability and hardening performance of the concrete, saves cement, reduces energy consumption, improves the compactness of the concrete, and the improvement of the compactness can effectively prevent the erosion of chloride ions, thereby enhancing the anti-chloride ion permeability of the concrete, and simultaneously can improve the mechanical property of the concrete.
Seawater is used as hydration reaction water and is proportionally prepared artificial seawater which comprises water and chemical compositions shown in table 1.
TABLE 1 chemical composition of artificial seawater
Example 1
The basalt fiber reinforced coral sand concrete provided by the invention comprises the following components in parts by mass: 240 parts of silicate cement, 192 parts of fly ash, 48 parts of slag powder, 528 parts of coral sand, 124.8 parts of seawater, 0.96 part of polycarboxylate superplasticizer and 2.11 parts of basalt fiber.
The preparation method of the basalt fiber reinforced coral sand concrete of the embodiment comprises the following steps:
(1) Wetting the wall of a stirring barrel, adding cement, fly ash and slag powder, and stirring for 1min to be uniform to obtain a cementing material; the artificial seawater can be prepared in advance.
(2) Adding 2/3 seawater into a stirring barrel, mixing with the cementing material, stirring for about 2min, and then adding the polycarboxylate superplasticizer and 1/3 seawater, stirring for about 2min to obtain the cementing slurry with certain fluidity.
(3) Uniformly stirring basalt fibers and coral sand in advance to uniformly disperse the basalt fibers in the coral sand to obtain a mixture, fully blending the mixture of the coral sand and the basalt fibers into gelatinous slurry, and stirring for 3min to obtain the concrete material.
(4) Pouring the concrete material into a mould, vibrating for 1min, removing the mould after 24 hours, and carrying out standard curing until 28d age to obtain the basalt fiber reinforced coral sand concrete.
The static compression test and the dynamic impact compression SHPB test were performed on the concrete blocks after the maintenance, and the results are shown in table 2.
Example 2
The basalt fiber reinforced coral sand concrete provided by the invention comprises the following components in parts by mass: 240 parts of silicate cement, 192 parts of fly ash, 48 parts of slag powder, 528 parts of coral sand, 124.8 parts of seawater, 0.96 part of polycarboxylate superplasticizer and 4.22 parts of basalt fiber.
The preparation method of the basalt fiber reinforced coral sand concrete of the embodiment comprises the following steps:
(1) Wetting the wall of a stirring barrel, adding cement, fly ash and slag powder, and stirring for 1min to be uniform to obtain a cementing material; the artificial seawater can be prepared in advance.
(2) Adding 2/3 seawater into a stirring barrel, mixing with the cementing material, stirring for about 2min, and then adding the polycarboxylate superplasticizer and 1/3 seawater, stirring for about 2min to obtain the cementing slurry with certain fluidity.
(3) Uniformly stirring basalt fibers and coral sand in advance to uniformly disperse the basalt fibers in the coral sand to obtain a mixture, fully blending the mixture of the coral sand and the basalt fibers into gelatinous slurry, and stirring for 3min to obtain the concrete material.
(4) Pouring the concrete material into a mould, vibrating for 1min, removing the mould after 24 hours, and carrying out standard curing until 28d age to obtain the basalt fiber reinforced coral sand concrete.
The static compression test and the dynamic impact compression SHPB test were performed on the concrete blocks after the maintenance, and the results are shown in table 2.
Fig. 1 is an SEM image of the connection between coral sand and a concrete matrix in basalt fiber reinforced coral sand concrete of this example. From the figure, coral sand has loose porous internal structure and is more easily broken under external force.
Fig. 2 is an SEM image of the connection of basalt fiber end portions with a concrete matrix in basalt fiber reinforced coral sand concrete of this example. From the figure, the basalt fiber reinforced coral sand concrete has the filling of hydration products in the holes, the basalt fiber matrix is wrapped by cement particles, and more hydration products are generated at the joints of the fiber surface and the fiber root and the concrete matrix.
Fig. 3 is an SEM image of three-dimensional skeleton bridging of basalt fibers in basalt fiber reinforced coral sand concrete of this example. From the figure, basalt fibers form a three-dimensional framework network system in the concrete matrix, which is stable in the concrete matrix, so that the deformation of the concrete material is restrained, which indicates that the basalt fibers can enhance the strength of the concrete.
Fig. 4 is an SEM image of basalt fiber breakage in basalt fiber reinforced coral sand concrete of this example. The fiber fracture part is shown to be in a cross tearing shape, which shows that the bonding performance of the basalt fiber and the concrete matrix is good, and also shows that the basalt fiber plays a good constraint role in the process of damaging the concrete matrix.
Example 3
The basalt fiber reinforced coral sand concrete provided by the invention comprises the following components in parts by mass: 240 parts of silicate cement, 192 parts of fly ash, 48 parts of slag powder, 528 parts of coral sand, 124.8 parts of seawater, 0.96 part of polycarboxylate superplasticizer and 8.44 parts of basalt fiber.
The preparation method of the basalt fiber reinforced coral sand concrete of the embodiment comprises the following steps:
(1) Wetting the wall of a stirring barrel, adding cement, fly ash and slag powder, and stirring for 1min to be uniform to obtain a cementing material; the artificial seawater can be prepared in advance.
(2) Adding 2/3 seawater into a stirring barrel, mixing with the cementing material, stirring for about 2min, and then adding the polycarboxylate superplasticizer and 1/3 seawater, stirring for about 2min to obtain the cementing slurry with certain fluidity.
(3) Uniformly stirring basalt fibers and coral sand in advance to uniformly disperse the basalt fibers in the coral sand to obtain a mixture, fully blending the mixture of the coral sand and the basalt fibers into gelatinous slurry, and stirring for 3min to obtain the concrete material.
(4) Pouring the concrete material into a mould, vibrating for 1min, removing the mould after 24 hours, and carrying out standard curing until 28d age to obtain the basalt fiber reinforced coral sand concrete.
The static compression test and the dynamic impact compression SHPB test were performed on the concrete blocks after the maintenance, and the results are shown in table 2.
Comparative example 1
The basalt fiber reinforced coral sand concrete consists of the following components in parts by mass: 240 parts of silicate cement, 192 parts of fly ash, 48 parts of slag powder, 528 parts of coral sand, 124.8 parts of seawater, 0.96 part of polycarboxylate superplasticizer and 4.22 parts of basalt fiber.
A preparation method of basalt fiber reinforced coral sand concrete comprises the following steps:
(1) Wetting the wall of a stirring barrel, adding cement, fly ash and slag powder, and stirring for 1min to be uniform to obtain a cementing material; the artificial seawater can be prepared in advance.
(2) Adding 2/3 seawater into a stirring barrel, mixing with the cementing material, stirring for about 2min, and then adding the polycarboxylate superplasticizer and 1/3 seawater, stirring for about 2min to obtain the cementing slurry with certain fluidity.
(3) Adding coral sand into the gelatinous slurry, and stirring until the coral sand is fully blended into the gelatinous slurry to obtain the material mixture.
(4) And (3) mixing basalt fibers into the material mixture to uniformly disperse the basalt fibers, thereby obtaining the concrete material.
(5) Pouring the concrete material into a mould, vibrating for 1min, removing the mould after 24 hours, and performing standard curing until 28d age to obtain the basalt fiber reinforced coral sand high-ductility concrete.
The static compression test and the dynamic impact compression SHPB test were performed on the concrete blocks after the maintenance, and the results are shown in table 2.
Comparative example 2
The carbon fiber reinforced coral sand concrete comprises the following components in parts by mass: 240 parts of Portland cement, 192 parts of fly ash, 48 parts of slag powder, 528 parts of coral sand, 124.8 parts of seawater, 0.96 part of polycarboxylate superplasticizer and 8.44 parts of carbon fiber.
A preparation method of carbon fiber reinforced coral sand concrete comprises the following steps:
(1) Pre-wetting coral sand to saturation 24 hours in advance before preparation, and manually preparing seawater in advance.
(2) The silicate cement, the fly ash and the slag powder are stirred uniformly, 2/3 of sea water is added and stirred for about 2min, and then the polycarboxylate superplasticizer and 1/3 of sea water are added and stirred for about 2min, so that the gelatinous slurry with certain fluidity is obtained.
(3) Uniformly stirring the carbon fibers and the coral sand in advance to uniformly disperse the carbon fibers in the coral sand to obtain a mixture, fully blending the mixture of the coral sand and the carbon fibers into gelatinous slurry, and stirring for 3min to obtain the concrete material.
(4) Pouring the concrete material into a mould, vibrating for 1min, removing the mould after 24 hours, and carrying out standard curing until 28d age to obtain the carbon fiber reinforced coral sand concrete.
The static compression test and the dynamic impact compression SHPB test were performed on the concrete blocks after the maintenance, and the results are shown in table 2.
Comparative example 3
The coral sand concrete without basalt fiber, namely blank group, is specifically as follows:
the coral sand concrete consists of the following components in parts by mass: 240 parts of Portland cement, 192 parts of fly ash, 48 parts of slag powder, 528 parts of coral sand, 124.8 parts of seawater and 0.96 part of polycarboxylate superplasticizer.
A preparation method of coral sand concrete comprises the following steps:
(1) Pre-wetting coral sand to saturation 24 hours in advance before preparation, and manually preparing seawater in advance.
(2) The silicate cement, the fly ash and the slag powder are stirred uniformly, 2/3 of sea water is added and stirred for about 2min, and then the polycarboxylate superplasticizer and 1/3 of sea water are added and stirred for about 2min, so that the gelatinous slurry with certain fluidity is obtained.
(3) Adding coral sand into the gelatinous slurry, and stirring until the coral sand is fully blended into the gelatinous slurry to obtain the concrete material.
(4) Pouring the concrete material into a mould, vibrating for 1min, removing the mould after 24 hours, and carrying out standard curing until 28d age to obtain the coral sand concrete.
The cured concrete block was subjected to static compression test and dynamic impact compression SHPB test, and the results are shown in table 2.
TABLE 2 static and dynamic compressive strength tables for concrete of examples 1-3 and comparative examples 1-3
The above description is only of the preferred embodiment of the present invention, and is not intended to limit the present invention in any way. While the invention has been described in terms of preferred embodiments, it is not intended to be limiting. Any person skilled in the art can make many possible variations and modifications to the technical solution of the present invention or equivalent embodiments using the method and technical solution disclosed above without departing from the spirit and technical solution of the present invention. Therefore, any simple modification, equivalent substitution, equivalent variation and modification of the above embodiments according to the technical substance of the present invention, which do not depart from the technical solution of the present invention, still fall within the scope of the technical solution of the present invention.
Claims (7)
1. The basalt fiber reinforced coral sand concrete is characterized by being prepared from the following raw materials: 220 to 260 parts of cement, 182 to 202 parts of fly ash, 38 to 58 parts of slag powder, 518 to 538 parts of coral sand, 114.8 to 134.8 parts of sea water, 0.40 to 1.2 parts of polycarboxylate superplasticizer and 2.11 to 8.44 parts of basalt fiber;
the particle size of the coral sand is 0.15-2.36 mm, and the fineness modulus of the coral sand is 1.88-2.03;
the elastic modulus of the basalt fiber is 91 GPa-110 GPa, the nominal length is 10mm, and the density is 2.63g/cm 3 ～2.65g/cm 3 The diameter of the monofilament is 7-15 mu m, and the breaking strength is more than 2000MPa;
the solid content of the polycarboxylate water reducer is 50%, and the water reducing rate is 28%;
the preparation method of the basalt fiber reinforced coral sand concrete comprises the following steps:
(1) Mixing and stirring cement, fly ash and slag powder to obtain a cementing material;
(2) Firstly, mixing and stirring a cementing material and 2/3 seawater, then adding a polycarboxylate water reducer and 1/3 seawater, and continuously stirring to obtain a gelatinous slurry;
(3) Mixing basalt fibers and coral sand, uniformly stirring to uniformly disperse the basalt fibers in the coral sand to obtain a mixture, and fully blending the mixture into the gelatinous slurry obtained in the step (2) for stirring to obtain a concrete material;
(4) Pouring the obtained concrete material into a mould, and curing to obtain basalt fiber reinforced coral sand concrete.
2. The basalt fiber reinforced coral sand concrete of claim 1, wherein the mass of said polycarboxylate water reducer is 0.2% of the total mass of cement, fly ash and slag powder.
3. A basalt fiber reinforced coral sand concrete according to claim 1 or 2, wherein said cement is Portland cement and said fly ash is a specific surface area of 1300m 2 Per kg, loss on ignition 2.8%, density 2.55g/cm 3 、SiO 2 Fly ash with 45.1 percent of content, 0.85 percent of water content and 16 percent of fineness, wherein the slag powder is characterized in that the specific surface area is 628m 2 Per kg, density 2.93g/cm 3 Slag powder with loss on ignition of 0.96% and water content of 0.4%.
4. Basalt fiber reinforced coral sand concrete according to claim 1 or 2, wherein said seawater is artificial seawater including NaCl, mgCl 2 ·6H 2 O、Na 2 SO 4 、CaCl 2 、KCl、NaHCO 3 KBr and water.
5. A method for preparing basalt fiber reinforced coral sand concrete according to any one of claims 1 to 4, comprising the steps of:
(1) Mixing and stirring cement, fly ash and slag powder to obtain a cementing material;
(2) Firstly, mixing and stirring a cementing material and 2/3 seawater, then adding a polycarboxylate water reducer and 1/3 seawater, and continuously stirring to obtain a gelatinous slurry;
(3) Mixing basalt fibers and coral sand, uniformly stirring to uniformly disperse the basalt fibers in the coral sand to obtain a mixture, and fully blending the mixture into the gelatinous slurry obtained in the step (2) for stirring to obtain a concrete material;
(4) Pouring the obtained concrete material into a mould, and curing to obtain basalt fiber reinforced coral sand concrete.
6. A method for preparing basalt fiber reinforced coral sand concrete according to claim 5, wherein in the step (1), the stirring time is 1min to 3min; in the step (2), the stirring time is 2-3 min, and the continuous stirring time is 2-3 min; in the step (3), the stirring time is 3-4 min.
7. A method for preparing basalt fiber reinforced coral sand concrete in either of claims 5 and 6, wherein in step (3), the coral sand is pre-moistened prior to mixing.
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