CN111777379A - Basalt fiber concrete for hydraulic engineering and preparation method thereof - Google Patents
Basalt fiber concrete for hydraulic engineering and preparation method thereof Download PDFInfo
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- CN111777379A CN111777379A CN202010678939.9A CN202010678939A CN111777379A CN 111777379 A CN111777379 A CN 111777379A CN 202010678939 A CN202010678939 A CN 202010678939A CN 111777379 A CN111777379 A CN 111777379A
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
- C04B28/02—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing hydraulic cements other than calcium sulfates
- C04B28/04—Portland cements
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- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
- C03C13/00—Fibre or filament compositions
- C03C13/06—Mineral fibres, e.g. slag wool, mineral wool, rock wool
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
- C04B2201/50—Mortars, concrete or artificial stone characterised by specific physical values for the mechanical strength
- C04B2201/52—High compression strength concretes, i.e. with a compression strength higher than about 55 N/mm2, e.g. reactive powder concrete [RPC]
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Abstract
The invention discloses basalt fiber concrete for hydraulic engineering. The invention discloses a preparation method of basalt fiber concrete for hydraulic engineering, which comprises the following steps: preparing a primary mixed material; adding chopped basalt fibers into fine aggregates in a stirring state, then adding the primary mixed material, uniformly mixing, adding the additive, and uniformly stirring to obtain a secondary mixed material; adding water into the secondary mixed material, stirring uniformly, and then adding cement and mineral admixture, and stirring. The invention effectively improves the abrasion resistance of the basalt fiber concrete for hydraulic engineering, effectively reduces the shrinkage deformation of the concrete, thereby improving the anti-cracking capability, and is suitable for environments with higher requirements on the erosion resistance and the anti-cracking capability of the concrete, such as hydraulic engineering water release buildings and the like.
Description
Technical Field
The invention relates to the technical field of cement engineering, in particular to basalt fiber concrete for hydraulic engineering and a preparation method thereof.
Background
The hydraulic engineering has the functions of power generation, flood fighting, irrigation and the like, and plays a very important role in the social and economic development. At present, many water conservancy facilities in China are constructed by reinforced concrete materials. Due to large rainfall, four directions of water flow and complex terrain, aggregate exposure, crack expansion and other diseases occur in long-term operation of hydraulic engineering due to water flow scouring and other reasons.
Therefore, concrete for water conservancy structures, which is frequently or periodically exposed to environmental water, is required to have properties such as erosion resistance, wear resistance, and crack resistance. A batch of large high-water-head power stations are built and are being built in China, the discharge flow velocity of water conservancy buildings is as high as 40-50m/s, and the requirements on the abrasion resistance and the crack resistance of concrete materials are higher.
Compared with the traditional concrete, the fiber concrete can obviously improve the scouring resistance, the wear resistance and the crack resistance of the concrete. But is not beneficial to the formation and development of early strength of concrete, and secondly, the addition of the fiber can reduce the slump of the concrete and the fluidity of the concrete is deteriorated.
Disclosure of Invention
The invention aims to solve the defects in the prior art and provides basalt fiber concrete for hydraulic engineering and a preparation method thereof.
A preparation method of basalt fiber concrete for hydraulic engineering comprises the following steps:
s1, mixing and crushing basalt ore, coal gangue and potassium nitrate, placing the mixture in a kiln, heating and stirring, adding silicon carbide particles, continuously stirring, drawing wires, cooling, then ultrasonically oscillating, airing, adding coarse aggregate, and uniformly mixing to obtain a primary mixture;
s2, slowly adding chopped basalt fibers into the fine aggregate under the stirring state, then adding the primary mixed material, uniformly mixing, adding the additive, and uniformly stirring to obtain a secondary mixed material;
and S3, adding water into the secondary mixed material under the stirring state, uniformly stirring, and then adding cement and mineral admixture and stirring.
Preferably, in S1, the basalt ore, the coal gangue and the potassium nitrate are mixed and then crushed to the fineness of 1-2 mm.
Preferably, in S1, the mixture is placed in a kiln, heated to 1350 ℃ and 1400 ℃, and stirred for 1-2 h.
Preferably, in S1, a platinum rhodium bushing with a hole diameter of 10 μm is used for drawing, and the bushing is immersed in the impregnating compound at a temperature of 0-2 ℃ for rapid cooling.
Preferably, in the ultrasonic oscillation process of S1, the environmental temperature of the ultrasonic oscillation is room temperature, the ultrasonic oscillation medium is water, the ultrasonic oscillation time is 10-20min, and the ultrasonic power is 400-.
Preferably, in S1, the mass ratio of basalt ore, coal gangue, potassium nitrate and silicon carbide particles is 8-14: 0.1-0.2: 0.2-0.4: 0.1-0.2, wherein the ratio of the total mass of basalt ore, coal gangue, potassium nitrate and silicon carbide particles to the mass of coarse aggregate is 8-15: 875-900.
Preferably, in S1, the coarse aggregate includes, by mass: 75-80% of broken stone, 5-10% of waste brick, 5-10% of ceramic waste residue and the balance expanded graphite; the grain composition of the coarse aggregate is 5-20 mm.
The coal gangue is solid waste discharged in the coal mining process and the coal washing process, and is a black and gray rock which has lower carbon content and is harder than coal and is associated with a coal bed in the coal forming process. The main component of which is Al2O3、SiO2And in addition, Fe in different quantities2O3、CaO、MgO、Na2O、K2O、P2O5、SO3And trace rare elements (gallium, vanadium, titanium, cobalt). So far, the utilization of coal gangue is not large enough, the technology is incomplete, the regional development is unbalanced, and the influence on the environment is still serious.
In the invention S1, basalt ore, coal gangue and potassium nitrate are heated and melted, then nano silicon carbide particles are added for toughening, then mixed fiber containing crystal grains is obtained by spinning, potassium nitrate as inorganic salt crystal grains is dissolved in distilled water under the auxiliary condition of ultrasonic oscillation to form holes, so that porous basalt fiber is formed, as the silicon carbide particles form an ordered structure under the action of stress, the rigidity of the basalt fiber is reduced, potassium nitrate crystallization can be promoted, and the formation of smooth drawing and holes of the basalt fiber is improved, and the applicant finds that the coal gangue is dispersed in the coal gangue, so that the rigidity of the basalt fiber containing holes is not too low, the phenomenon of easy breakage is avoided, the tensile strength of the basalt fiber can be effectively improved, and the obtained pretreated basalt fiber is mixed with coarse aggregate, the method has the advantages of low cost, simple production process and suitability for large-scale industrial production, and has wide application prospect in the field of concrete;
preferably, in S2, the raw materials of the admixture comprise, by mass: 60-70% of water reducing agent, 10-20% of dispersing agent and the balance of waterborne epoxy resin.
Preferably, in S2, the water reducing agent is a mixture of any one of lignosulfonate, sulfonated melamine formaldehyde resin and aromatic sulfamate polymer and polycarboxylic acid water reducing agent, and has a water reducing rate of 28-32% and a bleeding rate of 15-20%.
Preferably, in S2, the dispersant is at least one of carboxymethyl cellulose, hydroxyethyl cellulose, hydroxypropyl cellulose, and hydroxypropyl methyl cellulose.
Preferably, in S2, the fine aggregate is prepared by continuously grading medium sand and fine sand according to the mass ratio of 4: 1, and the fineness modulus of the fine aggregate is 2.0-3.0.
Preferably, in S2, the chopped basalt fiber has a length of 22-27mm, a monofilament diameter of 9-12 μm, a tensile strength of 2000-3000MPa, a tensile modulus of 70-78GPa, an elongation at break of 2.1-2.3%, and an alkali resistance of 82-85% or more of a retention rate of the monofilament breaking strength.
Preferably, in S2, the mass ratio of the fine aggregate, the chopped basalt fiber, the primary mixed material and the admixture is 804.7-812: 6.7-12.2: 848-882.5: 36.5-44.9.
The invention promotes the uniform dispersion of the raw material components by the grading mixing of S1 and S2.
Preferably, in S3, the mass ratio of the secondary mixture, the water, the cement and the mineral admixture is 1706-1754: 183-187: 335-341: 146-150.
Preferably, in S3, the mineral admixture is a mixture of fly ash and at least one of coal gangue, granulated blast furnace slag, and silica fume.
Preferably, the fineness of the fly ash is 8-10%, the water demand ratio is 85-90%, and the loss on ignition is 4.0-4.5%.
Preferably, in S3, the cement is portland cement and the strength grade is 42.5, 52.5 and/or 62.5.
The pretreated basalt fiber obtained by the invention increases the surface roughness in the aspect of morphology, increases the friction coefficient between the fiber and the coarse aggregate, and forms a uniform multidirectional branching system in concrete, the pretreated basalt fiber can generate an effective three-dimensional reinforcing effect when penetrating into the concrete, so that the integrity of the concrete is improved, micro cracks are blocked by the pretreated basalt fiber with surface defects in the development process, the energy is consumed, the further development is difficult, and the cracks are blocked to achieve the effects of cracking resistance and dry shrinkage deformation resistance.
The pretreated basalt fiber and the chopped basalt fiber are compounded with the water reducing agent and the dispersing agent, so that a large amount of toughening ribs are dispersed in concrete, a three-dimensional network structure is formed, the function of supporting a base material is achieved, and the anti-impact and anti-abrasion effects of high-speed sand-containing water flow on the concrete building overflow surface can be effectively reduced. The water reducing agent, the water-based epoxy resin and the mineral admixture generate a synergistic effect and play a role in filling in concrete, so that the pore size in the hydrated slurry is greatly reduced, the pore size distribution is improved, the permeability of the hydrated slurry is reduced, the shrinkage deformation of the concrete is effectively reduced, and the crack resistance is improved, thereby improving the strength of the concrete and the abrasion resistance.
The basalt fiber concrete for the hydraulic engineering is prepared by adopting the preparation method of the basalt fiber concrete for the hydraulic engineering.
The surface concrete is degraded in large area due to the scouring abrasion and cavitation action of the high-speed sand-containing water flow on the overflow surface of the hydraulic concrete building, and the invention has the advantages that: the novel basalt fibers are used as fiber reinforced materials, so that the mechanical property of the obtained concrete is improved, the abrasion resistance of the concrete for hydraulic engineering is effectively improved, and the shrinkage deformation of the concrete is effectively reduced, so that the crack resistance of the concrete for hydraulic engineering is improved. The invention optimizes the mixing proportion of the concrete, strengthens the whole structure, reduces the production cost, improves the resource utilization rate, ensures that the obtained concrete has excellent comprehensive performance, and is very suitable for environments with higher requirements on the erosion resistance and the crack resistance of the concrete, such as hydraulic release buildings and the like.
Detailed Description
The present invention will be further illustrated with reference to the following specific examples.
The following indexes of portland cement meet the requirements of general portland cement (GB 175); indexes of the medium sand and the fine sand of the continuous grading of the fine aggregate meet the technical requirements of grade II sand of construction sand (GB/T14684).
| Product(s) | Manufacturer of the product |
| Portland cement | Hubeixin run de chemical Co., Ltd |
| Basalt ore | Corridor Noway energy-saving technology Limited |
| Coal gangue | Henan Bairuide environmental protection science and technology Co., Ltd |
| Chopped basalt fiber | Hencal glass fiber Co Ltd in salt City |
| Fine aggregate (Medium sand, fine sand) | Lingshou county Hongsheng mineral product processing factory |
| Mineral admixture (silica fume, fly ash) | Lingshou county stone-building mineral powder factory |
Example 1
A preparation method of basalt fiber concrete for hydraulic engineering comprises the following steps:
s1, mixing 8kg of basalt ore, 0.2kg of coal gangue and 0.2kg of potassium nitrate, crushing to the fineness of 1-2mm, placing in a kiln, heating to 1400 ℃, stirring for 1h, adding 0.2kg of silicon carbide particles, continuously stirring, drawing by adopting a platinum-rhodium alloy wire-drawing bushing with the hole diameter of 10 microns, immersing in an impregnating compound at the temperature of 0-2 ℃, rapidly cooling, then placing in water, performing ultrasonic oscillation for 10min, drying in the air, adding 875kg of coarse aggregate with the particle size of 5-20mm, and uniformly mixing to obtain a primary mixed material;
the coarse aggregate comprises the following components in percentage by mass: 80% of broken stone, 5% of waste brick, 10% of ceramic waste residue and the balance of expanded graphite;
s2, slowly adding 12.2kg of chopped basalt fibers into 804.7kg of fine aggregate with the fineness modulus of 2.0-3.0 under the stirring state, then adding 848kg of the primary mixed material, uniformly mixing, adding 44.9kg of the additive, and uniformly stirring to obtain a secondary mixed material;
the fine aggregate is prepared from continuous graded medium sand and fine sand according to the mass ratio of 4: 1, mixing to obtain; the length of the chopped basalt fiber is 22mm, the monofilament diameter is 12 microns, the tensile strength is 2000Mpa, the tensile modulus is 73.6GPa, the elongation at break is 2.1%, and the alkali resistance is 83% of the retention rate of the monofilament breaking strength; the additive comprises the following raw materials in percentage by mass: the water reducing agent comprises 60% of water reducing agent with the water reducing rate of 28% and the bleeding rate of 20%, 20% of dispersing agent and the balance of water-based epoxy resin; the water reducing agent is a mixture of lignosulfonate and a polycarboxylic acid water reducing agent; the dispersing agent consists of hydroxypropyl cellulose and hydroxypropyl methyl cellulose;
s3, adding 187kg of water into 1706kg of the secondary mixed material under the stirring state, uniformly stirring, then adding 335kg of 52.5 portland cement and 146kg of mineral admixture, and stirring;
the mineral admixture is a mixture of silica fume and fly ash with the fineness of 8%, the water requirement ratio of 90% and the loss on ignition of 4.0%.
Example 2
A preparation method of basalt fiber concrete for hydraulic engineering comprises the following steps:
s1, mixing 14kg of basalt ore, 0.1kg of coal gangue and 0.4kg of potassium nitrate, crushing to the fineness of 1-2mm, placing in a kiln, heating to 1350 ℃, stirring for 2h, adding 0.1kg of silicon carbide particles, continuously stirring, drawing by adopting a platinum-rhodium alloy wire-drawing bushing with the hole diameter of 10 microns, immersing in a 0-2 ℃ wetting agent for rapid cooling, then placing in water for ultrasonic oscillation for 20min, performing ultrasonic power of 400W, airing, adding 900kg of coarse aggregate with the particle gradation of 5-20mm, and uniformly mixing to obtain a primary mixture;
the coarse aggregate comprises the following components in percentage by mass: 75% of broken stone, 10% of waste brick, 5% of ceramic waste residue and the balance expanded graphite;
s2, slowly adding 6.7kg of chopped basalt fibers into 812kg of fine aggregate with the fineness modulus of 2.0-3.0 under the stirring state, then adding 882.5kg of the primary mixed material, uniformly mixing, adding 36.5kg of the additive, and uniformly stirring to obtain a secondary mixed material;
the fine aggregate is prepared from continuous graded medium sand and fine sand according to the mass ratio of 4: 1, mixing to obtain; the length of the chopped basalt fiber is 24mm, the monofilament diameter is 9 mu m, the tensile strength is 2580Mpa, the tensile modulus is 70GPa, the elongation at break is 2.3%, and the alkali resistance is 82% of the retention rate of the monofilament breaking strength; the additive comprises the following raw materials in percentage by mass: the water reducing agent has the water reducing rate of 32 percent, the water bleeding rate of 15 percent, the dispersant of 10 percent and the balance of water-based epoxy resin; the water reducing agent is a mixture of sulfonated melamine formaldehyde resin, aromatic sulfamate polymer and polycarboxylic acid water reducing agent; the dispersant is carboxymethyl cellulose;
s3, adding 183kg of water into 1754kg of the secondary mixed material under the stirring state, uniformly stirring, then adding 341kg of 52.5 portland cement and 150kg of mineral admixture, and stirring;
the mineral admixture is a mixture of granulated blast furnace slag and fly ash with fineness of 10%, water requirement ratio of 85% and loss on ignition of 4.5%.
Example 3
A preparation method of basalt fiber concrete for hydraulic engineering comprises the following steps:
s1, mixing 10kg of basalt ore, 0.18kg of coal gangue and 0.25kg of potassium nitrate, crushing to the fineness of 1-2mm, placing in a kiln, heating to 1380 ℃, stirring for 1.2h, adding 0.17kg of silicon carbide particles, continuously stirring, drawing by adopting a platinum-rhodium alloy wire drawing bushing with the hole diameter of 10 microns, rapidly cooling by immersing in a 0-2 ℃ impregnating compound, placing in water, performing ultrasonic oscillation for 12min, drying in the air, adding 880kg of coarse aggregate with the particle size of 5-20mm, and uniformly mixing to obtain a primary mixture;
the coarse aggregate comprises the following components in percentage by mass: 78% of broken stone, 6% of waste brick, 9% of ceramic waste residue and the balance of expanded graphite;
s2, slowly adding 10.2kg of chopped basalt fibers into 807.6kg of fine aggregate with the fineness modulus of 2.0-3.0 under the stirring state, then adding 855.5kg of the primary mixed material, uniformly mixing, adding 42.6kg of the additive, and uniformly stirring to obtain a secondary mixed material;
the fine aggregate is prepared from continuous graded medium sand and fine sand according to the mass ratio of 4: 1, mixing to obtain; the length of the chopped basalt fiber is 25mm, the monofilament diameter is 10 microns, the tensile strength is 2600Mpa, the tensile modulus is 78GPa, the elongation at break is 2.1%, and the alkali resistance is 85% of the retention rate of the monofilament breaking strength; the additive comprises the following raw materials in percentage by mass: 30 percent of water reducing agent, 64 percent of water bleeding rate, 18 percent of dispersant and the balance of waterborne epoxy resin; the water reducing agent is a mixture of aromatic sulfamate polymer and polycarboxylic acid water reducing agent; the dispersing agent consists of hydroxyethyl cellulose and hydroxypropyl cellulose;
s3, adding 186kg of water into 1723kg of secondary mixed material under the stirring state, uniformly stirring, then adding 338kg of 52.5 silicate cement and 147kg of mineral admixture, and stirring;
the mineral admixture is a mixture of coal gangue, granulated blast furnace slag, silica fume and fly ash with the fineness of 8.5-9.5%, the water demand ratio of 86-88% and the loss on ignition of 4.0-4.5%.
Example 4
A preparation method of basalt fiber concrete for hydraulic engineering comprises the following steps:
s1, mixing 12kg of basalt ore, 0.12kg of coal gangue and 0.35kg of potassium nitrate, crushing to the fineness of 1-2mm, placing in a kiln, heating to 1360 ℃, stirring for 1.8h, adding 0.13kg of silicon carbide particles, continuously stirring, drawing by adopting a platinum-rhodium alloy drawing bushing with the hole diameter of 10 microns, rapidly cooling by immersing in a 0-2 ℃ impregnating compound, then placing in water for ultrasonic oscillation for 18min, drying in the air, adding 895kg of coarse aggregate with the particle size of 5-20mm, and uniformly mixing to obtain a primary mixture;
the coarse aggregate comprises the following components in percentage by mass: 76% of broken stone, 8% of waste brick, 7% of ceramic waste residue and the balance of expanded graphite;
s2, slowly adding 8kg of chopped basalt fibers into 810.2kg of fine aggregate with the fineness modulus of 2.0-3.0 under the stirring state, then adding 870.4kg of the primary mixed material, uniformly mixing, adding 39.7kg of the additive, and uniformly stirring to obtain a secondary mixed material;
the fine aggregate is prepared from continuous graded medium sand and fine sand according to the mass ratio of 4: 1, mixing to obtain; the length of the chopped basalt fiber is 27mm, the monofilament diameter is 9 microns, the tensile strength is 3000Mpa, the tensile modulus is 74GPa, the elongation at break is 2.3%, and the alkali resistance is 84% of the retention rate of the monofilament breaking strength; the additive comprises the following raw materials in percentage by mass: the water reducing agent comprises 68% of water reducing agent with the water reducing rate of 32% and the bleeding rate of 16%, 12% of dispersing agent and the balance of water-based epoxy resin; the water reducing agent is a mixture of lignosulfonate, sulfonated melamine formaldehyde resin and a polycarboxylic acid water reducing agent; the dispersing agent is hydroxypropyl methyl cellulose;
s3, under the stirring state, adding 184kg of water into 1744kg of the secondary mixed material, uniformly stirring, then adding 340kg of 52.5-silicate cement and 148kg of mineral admixture, and stirring;
the mineral admixture is a mixture of granulated blast furnace slag and fly ash with fineness of 8.5-9.5%, water requirement ratio of 86-88% and loss on ignition of 4.0-4.5%.
Example 5
A preparation method of basalt fiber concrete for hydraulic engineering comprises the following steps:
s1, mixing 11kg of basalt ore, 0.15kg of coal gangue and 0.3kg of potassium nitrate, crushing to the fineness of 1-2mm, placing in a kiln, heating to 1370 ℃, stirring for 1.5h, adding 0.15kg of silicon carbide particles, continuously stirring, drawing by adopting a platinum-rhodium alloy drawing bushing with the hole diameter of 10 microns, rapidly cooling by immersing in a 0-2 ℃ wetting agent, then placing in water, performing ultrasonic oscillation for 15min, drying in the air, adding 893kg of coarse aggregate with the particle size of 5-20mm, and uniformly mixing to obtain a primary mixed material;
the coarse aggregate comprises the following components in percentage by mass: 77% of broken stone, 7% of waste brick, 8% of ceramic waste residue and the balance of expanded graphite;
s2, slowly adding 9.1kg of chopped basalt fibers into 808.9kg of fine aggregate with the fineness modulus of 2.0-3.0 under the stirring state, then adding 863kg of the primary mixed material, uniformly mixing, adding 41.2kg of the additive, and uniformly stirring to obtain a secondary mixed material;
the fine aggregate is prepared from continuous graded medium sand and fine sand according to the mass ratio of 4: 1, mixing to obtain; the length of the chopped basalt fiber is 26mm, the monofilament diameter is 9 mu m, the tensile strength is 2900Mpa, the tensile modulus is 77GPa, the elongation at break is 2.2 percent, and the alkali resistance is 85 percent of the retention rate of the monofilament breaking strength; the additive comprises the following raw materials in percentage by mass: the water reducing agent comprises 66% of water reducing agent with the water reducing rate of 31% and the bleeding rate of 18%, 15% of dispersing agent and the balance of water-based epoxy resin; the water reducing agent is a mixture of lignosulfonate, sulfonated melamine formaldehyde resin, aromatic sulfamate polymer and polycarboxylic acid water reducing agent; the dispersing agent is composed of carboxymethyl cellulose, hydroxypropyl cellulose and hydroxypropyl methyl cellulose;
s3, adding 185kg of water into 1733.5kg of the secondary mixed material under the stirring state, uniformly stirring, then adding 339.6kg of 52.5 Portland cement and 147.7kg of mineral admixture, and stirring;
the mineral admixture is a mixture of coal gangue, granulated blast furnace slag, silica fume and fly ash with the fineness of 9 percent, the water demand ratio of 87 percent and the loss on ignition of 4.4 percent.
Comparative example 1
The difference from the embodiment 5 is that S1 is changed from the original S1 to the following steps: 893kg of coarse aggregate with 5-20mm of grain composition is added into 11.6kg of steel fiber and uniformly mixed to obtain a primary mixed material.
Comparative example 2
The difference from the example 5 is that S1 is not included, and the original S2 is modified as follows: under the stirring state, 808.9kg of fine aggregate with fineness modulus of 2.0-3.0 is slowly added with 9.1kg of chopped basalt fiber, then 863kg of coarse aggregate with particle size gradation of 5-20mm is added and uniformly mixed, and 41.2kg of additive is added and uniformly stirred to obtain a secondary mixed material.
Comparative example 3
The difference from the example 5 is that S1 is not included, and the original S2 is modified as follows: under the stirring state, 808.9kg of fine aggregate with fineness modulus of 2.0-3.0 is slowly added with 9.1kg of steel fiber, then 863kg of coarse aggregate with particle size of 5-20mm is added and mixed evenly, and 41.2kg of additive is added and stirred evenly to obtain the secondary mixture.
Comparative example 4
The difference from the embodiment 5 lies in that the additive is 66% of the water reducing agent with 31% of water reducing rate and 18% of bleeding rate in S2; the water reducing agent is a polycarboxylic acid water reducing agent.
Comparative example 5
The difference from example 5 is that in S3, the mineral admixture is fly ash with fineness of 9%, water demand ratio of 87%, and loss on ignition of 4.4%.
The parameters of the steel fiber are as follows: it has a length of 40mm, a width of 2.5mm, a thickness of 0.35mm and a density of 7850kg/m3The tensile strength was 950MPa, and the tensile modulus was 208 GPa.
The performance of the basalt fiber concrete for hydraulic engineering obtained in the example 5 and the concrete obtained in the comparative examples 1 to 5 is detected, and the concrete performance is as follows:
1. wetting the collapsed bucket and the ground with water before filling to prevent the water of the concrete from being absorbed, filling the mixed concrete into the collapsed bucket, leveling the concrete when the concrete is flush with the upper surface of the collapsed bucket, quickly lifting the collapsed bucket, and measuring the time T required for the concrete to expand from the beginning of flowing to the collapse of 500mm500；
2. Performing an anti-impact abrasion strength test by adopting a ring method and an underwater steel ball method in DL/T5150 and 2017 'Hydraulic concrete test regulations';
3. adopting a method in JGJ/T70-2009 'basic performance test method of building mortar' to test the compressive strength;
4. placing the concrete shrinkage deformation to-be-detected piece with the size of 100mm multiplied by 510mm in a constant temperature shrinkage chamber with the temperature of 20 +/-2 ℃ and the relative humidity of 60 +/-5% for curing and detection.
The results are as follows:
from the above table, it can be seen that: the invention effectively improves the abrasion resistance of the basalt fiber concrete for hydraulic engineering, and effectively reduces the drying shrinkage deformation of the concrete, thereby improving the crack resistance. The invention has excellent comprehensive performance and is suitable for environments with higher requirements on the erosion resistance and the crack resistance of concrete, such as hydraulic engineering water release buildings and the like.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and the technical solutions and the inventive concepts thereof according to the present invention should be equivalent or changed within the scope of the present invention.
Claims (10)
1. A preparation method of basalt fiber concrete for hydraulic engineering is characterized by comprising the following steps:
s1, mixing and crushing basalt ore, coal gangue and potassium nitrate, placing the mixture in a kiln, heating and stirring, adding silicon carbide particles, continuously stirring, drawing wires, cooling, then ultrasonically oscillating, airing, adding coarse aggregate, and uniformly mixing to obtain a primary mixture;
s2, slowly adding chopped basalt fibers into the fine aggregate under the stirring state, then adding the primary mixed material, uniformly mixing, adding the additive, and uniformly stirring to obtain a secondary mixed material;
and S3, adding water into the secondary mixed material under the stirring state, uniformly stirring, and then adding cement and mineral admixture and stirring.
2. The preparation method of basalt fiber concrete for hydraulic engineering according to claim 1, wherein in S1, the basalt ore, the coal gangue and the potassium nitrate are mixed and crushed to a fineness of 1-2 mm.
3. The method for preparing basalt fiber concrete for water conservancy projects as claimed in claim 1, wherein S1 is placed in a kiln, heated to 1350 ℃ and 1400 ℃, and stirred for 1-2 h.
4. The method for preparing basalt fiber concrete for water conservancy projects according to claim 1, wherein in S1, a platinum-rhodium alloy bushing with a hole diameter of 10 μm is used for drawing, and the bushing is immersed in an impregnating compound at a temperature of 0-2 ℃ for rapid cooling.
5. The preparation method of basalt fiber concrete for water conservancy projects as claimed in claim 1, wherein in the ultrasonic oscillation process of S1, the environmental temperature of the ultrasonic oscillation is room temperature, the ultrasonic oscillation medium is water, the ultrasonic oscillation time is 10-20min, and the ultrasonic power is 400-.
6. The preparation method of basalt fiber concrete for hydraulic engineering according to claim 1, wherein in S1, the mass ratio of basalt ore, coal gangue, potassium nitrate and silicon carbide particles is 8-14: 0.1-0.2: 0.2-0.4: 0.1-0.2, wherein the ratio of the total mass of basalt ore, coal gangue, potassium nitrate and silicon carbide particles to the mass of coarse aggregate is 8-15: 875-900.
7. The preparation method of the basalt fiber concrete for the hydraulic engineering according to claim 1, wherein in S2, the raw materials of the admixture comprise, by mass: 70-80% of water reducing agent and 20-30% of dispersing agent;
the water reducing agent is a mixture of any one of lignosulfonate, sulfonated melamine formaldehyde resin and aromatic sulfamate polymer and a polycarboxylic acid water reducing agent, and has the water reducing rate of 28-32% and the bleeding rate of 15-20%.
8. The preparation method of the basalt fiber concrete for the hydraulic engineering as claimed in claim 1, wherein in S2, the mass ratio of the fine aggregate, the chopped basalt fiber, the primary mixed material and the admixture is 804.7-812.6: 6.7-12.2: 848.3-882.1: 36.5-44.9.
9. The preparation method of basalt fiber concrete for hydraulic engineering according to claim 1, wherein in S3, the mass ratio of the secondary mixture, water, cement and mineral admixture is 1706-1754: 183-187: 335-341: 146-150.
10. The basalt fiber concrete for the hydraulic engineering is characterized by being prepared by the preparation method of the basalt fiber concrete for the hydraulic engineering as claimed in any one of claims 1 to 9.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN116145735A (en) * | 2022-09-07 | 2023-05-23 | 中铁建工集团有限公司 | Waterproof engineering construction method for station main body structure |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN116145735A (en) * | 2022-09-07 | 2023-05-23 | 中铁建工集团有限公司 | Waterproof engineering construction method for station main body structure |
| CN116145735B (en) * | 2022-09-07 | 2023-10-27 | 中铁建工集团有限公司 | Waterproof engineering construction method for station main body structure |
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