CN111205034B - Compression-resistant concrete and preparation method thereof - Google Patents
Compression-resistant concrete and preparation method thereof Download PDFInfo
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- CN111205034B CN111205034B CN202010049247.8A CN202010049247A CN111205034B CN 111205034 B CN111205034 B CN 111205034B CN 202010049247 A CN202010049247 A CN 202010049247A CN 111205034 B CN111205034 B CN 111205034B
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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
- 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
- C04B20/00—Use of materials as fillers for mortars, concrete or artificial stone according to more than one of groups C04B14/00 - C04B18/00 and characterised by shape or grain distribution; Treatment of materials according to more than one of the groups C04B14/00 - C04B18/00 specially adapted to enhance their filling properties in mortars, concrete or artificial stone; Expanding or defibrillating materials
- C04B20/10—Coating or impregnating
- C04B20/12—Multiple coating or impregnating
-
- 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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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Materials Engineering (AREA)
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- Organic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Inorganic Chemistry (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
The invention discloses compression-resistant concrete and a preparation method thereof, wherein the compression-resistant concrete comprises the following raw materials in parts by weight: 90-120 parts of Portland cement, 10-15 parts of fly ash, 15-25 parts of mineral powder, 140 parts of sand, 350 parts of crushed stone, 0.9-1.5 parts of modified basalt fiber, 1.5-2.5 parts of additive and 45-60 parts of water; the modified basalt fiber comprises basalt fiber, carbon nano tubes and calcium carbonate. The invention can greatly improve the mechanical property of the concrete, so that the prepared concrete has excellent strength and toughness and is widely applicable to the field of building materials.
Description
Technical Field
The invention relates to the technical field of concrete, in particular to compression-resistant concrete and a preparation method thereof.
Background
Concrete is a mixed material prepared from a cementing material, aggregate, an admixture, an additive and water, and is a current main building material. With the continuous development of the construction engineering technology, the performance requirements on concrete are gradually improved. The compressive strength is the most basic index for measuring the mechanical property of the concrete, and plays a crucial role in the bearing capacity and the service life of the concrete, so that the improvement of the compressive strength of the concrete has important practical significance.
The basalt fiber has the characteristics of high cost performance, high tensile strength, corrosion resistance, high temperature resistance and high stability, and is a novel concrete reinforcing material. A plurality of researches show that proper amount of basalt fiber is doped in concrete, which is beneficial to improving the strength and toughness of the concrete. However, the basalt fiber has a smooth surface, the interface bonding between the basalt fiber and the concrete matrix is poor, and a certain gap exists between the fiber and the cement mortar interface, which has a negative effect on the improvement effect of the concrete strength and is not beneficial to the improvement of the concrete mechanical property.
Disclosure of Invention
The invention aims to make up the defects of the prior art and provides compression-resistant concrete and a preparation method thereof.
In order to realize the purpose, the invention is realized by the following technical scheme:
the compression-resistant concrete comprises the following raw materials in parts by weight:
90-120 parts of Portland cement, 10-15 parts of fly ash, 15-25 parts of mineral powder, 140 parts of sand, 350 parts of crushed stone, 0.9-1.5 parts of modified basalt fiber, 1.5-2.5 parts of additive and 45-60 parts of water;
the modified basalt fiber comprises the components of basalt fiber, carbon nano tubes and calcium carbonate.
Preferably, the preparation method of the modified basalt fiber comprises the following steps:
coating a carbon nano tube on the surface of basalt fiber to obtain the basalt fiber coated by the carbon nano tube;
and (2) coating calcium carbonate on the surface of the carbon nanotube coated basalt fiber to obtain the modified basalt fiber.
Preferably, in the step (1), the basalt fiber is dipped in the carbon nanotube suspension, and then taken out and dried to obtain the carbon nanotube-coated basalt fiber.
Preferably, the weight ratio of the basalt fibers to the carbon nanotube suspension is (1-2): 10; the carbon nano tube suspension is prepared by dispersing carbon nano tubes in absolute ethyl alcohol, and the solid content of the carbon nano tube suspension is 0.05-0.1%.
Preferably, in the step (2), the carbon nanotube-coated basalt fiber is added into the calcium hydroxide suspension for full dispersion, then the crystal form control agent is added for uniform mixing, and CO is introduced2Reacting the obtained product, filtering and drying after the reaction is finished, thus obtaining the modified basalt fiber.
Preferably, the weight ratio of the carbon nanotube coated basalt fiber to the calcium hydroxide suspension is (1-2): 5; the calcium hydroxide suspension is prepared by dispersing calcium hydroxide in water, and the solid content of the calcium hydroxide suspension is 0.5-1%; the weight ratio of the crystal form control agent to the calcium hydroxide suspension is (0.1-0.5):100, and the crystal form control agent is one or a mixture of more of citric acid, sucrose, disodium ethylene diamine tetraacetate, sodium dodecyl sulfate and polyvinylpyrrolidone.
Preferably, the reaction temperature is 80-95 ℃, and the pH value is 6.8-7.2 at the end of the reaction; said CO-containing2In the gas of (2), CO2Is 25-30% by volume.
Preferably, the carbon nanotube is a carboxylated carbon nanotube, and the preparation method of the carboxylated carbon nanotube comprises the following steps: the carbon nano tube is firstly treated by sulfuric acid solution with the molar concentration of 0.8mol/L for 48 hours, then treated by hydrogen peroxide solution with the mass concentration of 25% for 48 hours, washed and dried to obtain the carbon nano tube.
Preferably, the preparation method of the carboxylated carbon nanotube comprises the following steps:
treating the carbon nano tube with 0.6-1mol/L sulfuric acid solution for 40-60h, then treating with 20-30% hydrogen peroxide solution for 40-60h, washing and drying to obtain the carbon nano tube.
Preferably, the carbon nanotube has a length of 15 to 20 μm and an outer diameter of 10 to 15 nm.
Preferably, the length of the basalt fiber is 5 to 8 mm.
Preferably, the portland cement is 42.5-grade portland cement, and the additive is a polycarboxylic acid water reducing agent.
The preparation method of the compression-resistant concrete comprises the following steps:
(a) uniformly mixing portland cement, fly ash, mineral powder, sand, broken stone and modified basalt fiber to obtain a mixture;
(b) and mixing and stirring the mixture, the additive and water uniformly to obtain the compression-resistant concrete.
The invention has the advantages that:
the invention greatly improves the compressive strength of the concrete by adopting a proper raw material proportion and a method of doping the modified basalt fiber, the preparation method of the modified basalt fiber comprises the following steps: firstly, coating proper amount of carbon nano tubes on the surface of basalt fiber uniformly by a physical deposition method, then, the in-situ synthesis method is used for generating micro-nano calcium carbonate particles on the surface of the basalt fiber uncoated carbon nano tube and the carbon nano tube loaded on the surface of the basalt fiber to form the modified basalt fiber with a complex surface structure, which can effectively improve the hydrophilicity and the roughness of the surface of the basalt fiber, so that the basalt fiber can be uniformly dispersed in concrete, and because the interface has a large number of fibrous, granular microcosmic projections, form the engaging action with the interface of the cement mortar, improve the interface strength, thus improve the compressive strength of the concrete better; the aggregate of the carbon nanotubes in the concrete is reduced, the carbon nanotubes can be distributed in the concrete more uniformly, and form a composite filling system with basalt fibers and micro-nano calcium carbonate particles, so that a better filling effect is achieved on pores in the concrete, the density of the concrete is increased, and the compressive strength of the concrete is further improved; furthermore, the adoption of the carboxylated carbon nano tube is beneficial to improving the affinity of the carbon nano tube with basalt fiber and calcium carbonate, so that the interface connection performance of the modified basalt fiber to concrete can be further improved, and the compressive strength of the concrete is further improved.
In conclusion, the invention can greatly improve the mechanical property of the concrete, so that the prepared concrete has excellent strength and toughness and is widely applied to the field of building materials.
Detailed Description
In the following examples and comparative examples, carbon nanotubes having a length of 16 μm and an outer diameter of 12nm were used; the length of the basalt fiber is 6 mm.
Example 1
The compression-resistant concrete comprises the following raw materials in parts by weight:
90 parts of 42.5-grade portland cement, 10 parts of fly ash, 15 parts of mineral powder, 140 parts of sand, 300 parts of crushed stone, 0.9 part of modified basalt fiber, 1.5 parts of polycarboxylic acid water reducing agent and 45 parts of water;
the preparation method of the modified basalt fiber comprises the following steps:
dispersing the carboxylated carbon nanotubes in absolute ethyl alcohol to prepare carbon nanotube suspension with the solid content of 0.05%, then dipping the basalt fiber in the carbon nanotube suspension, taking out the basalt fiber, and drying to obtain the carbon nanotube-coated basalt fiber, wherein the weight ratio of the basalt fiber to the carbon nanotube suspension is 1: 10;
step (2) firstly dispersing calcium hydroxide in water to prepare calcium hydroxide suspension with solid content of 0.5%, then adding the carbon nano tube coated basalt fiber into the calcium hydroxide suspension for full dispersion, then adding ethylene diamine tetraacetic acid for uniform mixing, and introducing CO2Reacting the obtained gas at 80 ℃ until the pH value is 6.8, filtering and drying after the reaction is finished to obtain the modified basalt fiber, wherein the weight ratio of the carbon nanotube coated basalt fiber to the calcium hydroxide suspension is 1: and 5, the weight ratio of the disodium ethylene diamine tetraacetate to the calcium hydroxide suspension is 0.1:100, containing CO2CO in the gas of (2)2Is 25% by volume.
The preparation method of the carboxylated carbon nanotube comprises the following steps: the carbon nano tube is firstly treated by sulfuric acid solution with the molar concentration of 0.8mol/L for 48 hours, then treated by hydrogen peroxide solution with the mass concentration of 25% for 48 hours, washed and dried to obtain the carbon nano tube.
The preparation method of the compression-resistant concrete comprises the following steps:
(a) uniformly mixing 42.5-grade portland cement, fly ash, mineral powder, sand, gravel and modified basalt fiber to obtain a mixture;
(b) and (3) uniformly mixing and stirring the mixture, a polycarboxylic acid water reducing agent and water to obtain the compressive concrete.
Example 2
The compression-resistant concrete comprises the following raw materials in parts by weight:
120 parts of 42.5-grade portland cement, 15 parts of fly ash, 25 parts of mineral powder, 180 parts of sand, 350 parts of crushed stone, 1.5 parts of modified basalt fiber, 2.5 parts of a polycarboxylic acid water reducing agent and 60 parts of water;
the preparation method of the modified basalt fiber comprises the following steps:
dispersing the carboxylated carbon nanotubes in absolute ethyl alcohol to prepare carbon nanotube suspension with the solid content of 0.1%, then dipping basalt fibers in the carbon nanotube suspension, taking out, and drying to obtain the carbon nanotube-coated basalt fibers, wherein the weight ratio of the basalt fibers to the carbon nanotube suspension is 2: 10;
step (2) firstly dispersing calcium hydroxide in water to prepare calcium hydroxide suspension with solid content of 1%, then adding the carbon nano tube coated basalt fiber into the calcium hydroxide suspension for full dispersion, then adding lauryl sodium sulfate for uniform mixing, and introducing CO2Reacting the obtained gas at 95 ℃ until the pH value is 7.2, filtering and drying after the reaction is finished to obtain the modified basalt fiber, wherein the weight ratio of the carbon nanotube coated basalt fiber to the calcium hydroxide suspension is 2: 5, the weight ratio of the sodium dodecyl sulfate to the calcium hydroxide suspension is 0.5:100, and the suspension contains CO2CO in the gas of (2)2Is 30% by volume.
The preparation method of the carboxylated carbon nanotube comprises the following steps: the carbon nano tube is firstly treated by sulfuric acid solution with the molar concentration of 0.8mol/L for 48 hours, then treated by hydrogen peroxide solution with the mass concentration of 25% for 48 hours, washed and dried to obtain the carbon nano tube.
The preparation method of the compression-resistant concrete comprises the following steps:
(a) uniformly mixing 42.5-grade portland cement, fly ash, mineral powder, sand, gravel and modified basalt fiber to obtain a mixture;
(b) and (3) uniformly mixing and stirring the mixture, a polycarboxylic acid water reducing agent and water to obtain the compressive concrete.
Example 3
The compression-resistant concrete comprises the following raw materials in parts by weight:
100 parts of 42.5-grade portland cement, 12.5 parts of fly ash, 20 parts of mineral powder, 150 parts of sand, 325 parts of broken stone, 1.2 parts of modified basalt fiber, 2 parts of polycarboxylic acid water reducing agent and 50 parts of water;
the preparation method of the modified basalt fiber comprises the following steps:
dispersing the carboxylated carbon nanotubes in absolute ethyl alcohol to prepare carbon nanotube suspension with the solid content of 0.08%, then dipping the basalt fiber in the carbon nanotube suspension, taking out the basalt fiber, and drying to obtain the carbon nanotube-coated basalt fiber, wherein the weight ratio of the basalt fiber to the carbon nanotube suspension is 1.5: 10;
step (2) firstly dispersing calcium hydroxide in water to prepare calcium hydroxide suspension with solid content of 0.6%, then adding the carbon nano tube coated basalt fiber into the calcium hydroxide suspension for full dispersion, then adding polyvinylpyrrolidone for uniform mixing, and introducing CO2Reacting the gas at 85 ℃ until the pH value is 7, filtering and drying after the reaction is finished to obtain the modified basalt fiber, wherein the weight ratio of the carbon nano tube coated basalt fiber to the calcium hydroxide suspension is 1.5: 5, the weight ratio of the polyvinylpyrrolidone to the calcium hydroxide suspension is 0.4:100, and the suspension contains CO2CO in the gas of (2)2Is 28% by volume.
The preparation method of the carboxylated carbon nanotube comprises the following steps: the carbon nano tube is firstly treated by sulfuric acid solution with the molar concentration of 0.8mol/L for 48 hours, then treated by hydrogen peroxide solution with the mass concentration of 25% for 48 hours, washed and dried to obtain the carbon nano tube.
The preparation method of the compression-resistant concrete comprises the following steps:
(a) uniformly mixing 42.5-grade portland cement, fly ash, mineral powder, sand, gravel and modified basalt fiber to obtain a mixture;
(b) and (3) uniformly mixing and stirring the mixture, a polycarboxylic acid water reducing agent and water to obtain the compressive concrete.
Comparative example 1
The concrete comprises the following raw materials in parts by weight:
100 parts of 42.5-grade portland cement, 12.5 parts of fly ash, 20 parts of mineral powder, 150 parts of sand, 325 parts of broken stone, 1.2 parts of modified basalt fiber, 2 parts of polycarboxylic acid water reducing agent and 50 parts of water;
the preparation method of the modified basalt fiber comprises the following steps:
dispersing calcium hydroxide in water to obtain calcium hydroxide suspension with solid content of 0.6%, adding basalt fiber into calcium hydroxide suspension, dispersing, adding polyvinylpyrrolidone, mixing, and introducing CO2Reacting the gas at 85 ℃ until the pH value is 7, filtering and drying after the reaction is finished to obtain modified basalt fibers, wherein the weight ratio of the basalt fibers to the calcium hydroxide suspension is 1.5: 5, the weight ratio of the polyvinylpyrrolidone to the calcium hydroxide suspension is 0.4:100, and the suspension contains CO2CO in the gas of (2)2Is 28% by volume.
The preparation method of the concrete comprises the following steps:
(a) uniformly mixing 42.5-grade portland cement, fly ash, mineral powder, sand, gravel and modified basalt fiber to obtain a mixture;
(b) and (3) uniformly mixing and stirring the mixture, a polycarboxylic acid water reducing agent and water to obtain the compressive concrete.
Comparative example 2
The concrete comprises the following raw materials in parts by weight:
100 parts of 42.5-grade portland cement, 12.5 parts of fly ash, 20 parts of mineral powder, 150 parts of sand, 325 parts of broken stone, 1.2 parts of carboxylated carbon nanotube coated basalt fiber, 2 parts of polycarboxylic acid water reducing agent and 50 parts of water;
the preparation method of the basalt fiber coated by the carboxylated carbon nanotube comprises the following steps:
firstly dispersing the carboxylated carbon nanotubes in absolute ethyl alcohol to prepare a carboxylated carbon nanotube suspension with the solid content of 0.08%, then dipping basalt fibers in the carboxylated carbon nanotube suspension, taking out the basalt fibers and drying the basalt fibers to obtain the carboxylated carbon nanotube coated basalt fibers, wherein the weight ratio of the basalt fibers to the carboxylated carbon nanotube suspension is 1.5: 10.
the preparation method of the carboxylated carbon nanotube comprises the following steps: the carbon nano tube is firstly treated by sulfuric acid solution with the molar concentration of 0.8mol/L for 48 hours, then treated by hydrogen peroxide solution with the mass concentration of 25% for 48 hours, washed and dried to obtain the carbon nano tube.
The preparation method of the concrete comprises the following steps:
(a) uniformly mixing 42.5-grade portland cement, fly ash, mineral powder, sand, broken stone and basalt fiber coated by a carboxylated carbon nanotube to obtain a mixture;
(b) and (3) uniformly mixing and stirring the mixture, a polycarboxylic acid water reducing agent and water to obtain the compressive concrete.
Comparative example 3
The concrete comprises the following raw materials in parts by weight:
100 parts of 42.5-grade portland cement, 12.5 parts of fly ash, 20 parts of mineral powder, 150 parts of sand, 325 parts of broken stone, 1.2 parts of basalt fiber, 2 parts of a polycarboxylic acid water reducing agent and 50 parts of water;
the preparation method of the concrete comprises the following steps:
(a) uniformly mixing 42.5-grade portland cement, fly ash, mineral powder, sand, gravel and basalt fiber to obtain a mixture;
(b) and (3) uniformly mixing and stirring the mixture, a polycarboxylic acid water reducing agent and water to obtain the compressive concrete.
The concrete prepared in the examples 1-3 and the comparative examples 1-3 is subjected to a performance test according to GB/T14902-:
therefore, the concrete has higher compressive strength and good construction performance.
Claims (4)
1. The compression-resistant concrete is characterized by comprising the following raw materials in parts by weight:
90-120 parts of Portland cement, 10-15 parts of fly ash, 15-25 parts of mineral powder, 140 parts of sand, 350 parts of broken stone, 0.9-1.5 parts of modified basalt fiber, 1.5-2.5 parts of additive and 45-60 parts of water;
the additive is a polycarboxylic acid water reducing agent;
the modified basalt fiber comprises the components of basalt fiber, carbon nano tubes and calcium carbonate;
the preparation method of the modified basalt fiber comprises the following steps:
coating a carbon nano tube on the surface of basalt fiber to obtain the basalt fiber coated by the carbon nano tube;
coating calcium carbonate on the surface of the carbon nanotube coated basalt fiber to obtain a modified basalt fiber;
in the step (1), firstly, the basalt fiber is dipped in the carbon nano tube suspension, and then the basalt fiber is taken out and dried to obtain the carbon nano tube coated basalt fiber;
the weight ratio of the basalt fibers to the carbon nano tube suspension is (1-2): 10; the carbon nano tube suspension is prepared by dispersing carbon nano tubes in absolute ethyl alcohol, and the solid content of the carbon nano tube suspension is 0.05-0.1%;
in the step (2), the carbon nano tube coated basalt fiber is added into the calcium hydroxide suspension for full dispersion, then the crystal form control agent is added for uniform mixing, and CO is introduced2Reacting the obtained gas, filtering and drying after the reaction is finished to obtain modified basalt fibers;
the weight ratio of the carbon nanotube coated basalt fiber to the calcium hydroxide suspension is (1-2): 5; the calcium hydroxide suspension is prepared by dispersing calcium hydroxide in water, and the solid content of the calcium hydroxide suspension is 0.5-1%; the weight ratio of the crystal form control agent to the calcium hydroxide suspension is (0.1-0.5):100, and the crystal form control agent is one or a mixture of more of citric acid, sucrose, disodium ethylene diamine tetraacetate, sodium dodecyl sulfate and polyvinylpyrrolidone;
the reaction temperature is 80-95 ℃, and the pH value is 6.8-7.2 when the reaction is finished; said CO-containing2In the gas of (2), CO2Is 25-30% by volume.
2. The concrete according to claim 1, wherein the carbon nanotubes are carboxylated carbon nanotubes, and the preparation method of the carboxylated carbon nanotubes comprises the following steps: the carbon nano tube is firstly treated by sulfuric acid solution with the molar concentration of 0.8mol/L for 48 hours, then treated by hydrogen peroxide solution with the mass concentration of 25% for 48 hours, washed and dried to obtain the carbon nano tube.
3. The concrete according to claim 1, wherein the portland cement is 42.5 grade portland cement.
4. A method for preparing a concrete with resistance to compression according to any one of claims 1 to 3, characterized by comprising the following steps:
(a) uniformly mixing portland cement, fly ash, mineral powder, sand, broken stone and modified basalt fiber to obtain a mixture;
(b) and mixing and stirring the mixture, the additive and water uniformly to obtain the compression-resistant concrete.
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