CN112125602A - Preparation method of pervious concrete - Google Patents

Preparation method of pervious concrete Download PDF

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Publication number
CN112125602A
CN112125602A CN202010939177.3A CN202010939177A CN112125602A CN 112125602 A CN112125602 A CN 112125602A CN 202010939177 A CN202010939177 A CN 202010939177A CN 112125602 A CN112125602 A CN 112125602A
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composite material
ionic liquid
glass fiber
pervious concrete
piperidine
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荆建军
肖力
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Dongguan University of Technology
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Dongguan University of Technology
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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
    • 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
    • C04B20/02—Treatment
    • C04B20/023—Chemical treatment
    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07D—HETEROCYCLIC COMPOUNDS
    • C07D211/00—Heterocyclic compounds containing hydrogenated pyridine rings, not condensed with other rings
    • C07D211/04—Heterocyclic compounds containing hydrogenated pyridine rings, not condensed with other rings with only hydrogen or carbon atoms directly attached to the ring nitrogen atom
    • C07D211/06—Heterocyclic compounds containing hydrogenated pyridine rings, not condensed with other rings with only hydrogen or carbon atoms directly attached to the ring nitrogen atom having no double bonds between ring members or between ring members and non-ring members
    • C07D211/36—Heterocyclic compounds containing hydrogenated pyridine rings, not condensed with other rings with only hydrogen or carbon atoms directly attached to the ring nitrogen atom having no double bonds between ring members or between ring members and non-ring members with hetero atoms or with carbon atoms having three bonds to hetero atoms with at the most one bond to halogen, e.g. ester or nitrile radicals, directly attached to ring carbon atoms
    • C07D211/40—Oxygen atoms
    • C07D211/44—Oxygen atoms attached in position 4
    • C07D211/46—Oxygen atoms attached in position 4 having a hydrogen atom as the second substituent in position 4
    • 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
    • C04B2111/00241—Physical properties of the materials not provided for elsewhere in C04B2111/00
    • C04B2111/00284—Materials permeable to liquids
    • 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
    • C04B2111/76—Use at unusual temperatures, e.g. sub-zero
    • 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
    • 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)
  • Organic Chemistry (AREA)
  • Engineering & Computer Science (AREA)
  • Ceramic Engineering (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Materials Engineering (AREA)
  • Structural Engineering (AREA)
  • General Chemical & Material Sciences (AREA)
  • Inorganic Chemistry (AREA)
  • Curing Cements, Concrete, And Artificial Stone (AREA)
  • Compositions Of Macromolecular Compounds (AREA)

Abstract

The invention discloses a preparation method of pervious concrete, which comprises the following steps: step one, preparing a vitamin-piperidine ionic liquid composite material, and screening coarse aggregate to obtain coarse aggregate with the particle size of 5-20 mm; step two, weighing the following raw materials in percentage by weight: 20-25% of cement, 50-60% of coarse aggregate, 5-10% of adhesive, 5-10% of polyethylene glycol, 5-10% of carbon nanotube-glass fiber-piperidine ionic liquid composite material and the balance of water; and step three, sequentially adding cement, coarse aggregate, the carbon nano tube-glass fiber-piperidine ionic liquid composite material into a stirrer, fully and uniformly stirring, respectively adding the adhesive, polyethylene glycol and water into the stirrer under the stirring condition, and continuously stirring for 5-10min to prepare the pervious concrete, wherein the adhesive force between cement paste and the aggregate can be effectively enhanced, the working performance of the concrete can be effectively improved, and the compression resistance, bending resistance, impact strength and water permeability coefficient of the concrete can be improved, so that the service life of the concrete is prolonged.

Description

Preparation method of pervious concrete
Original application No.: 2018112265571
The original case applicant: dongguan school of science and technology
Application date of the original case: year 2018, month 10 and day 22.
Technical Field
The invention relates to the technical field of building materials, in particular to a preparation method of pervious concrete.
Background
Along with the rapid development of economy and society, the scale and the strength of urban construction are continuously increased, so that the urban surface environment is gradually hardened, and the ecological ring belt of a city is greatly influenced; the traditional cement or asphalt ground can prevent rainwater from permeating underground, so that urban waterlogging is easily caused, traffic is affected, a large amount of rainwater is lost, and groundwater is not supplemented; in the past, the underground water level is reduced, the vegetation growth is influenced, and the problems of drought, water shortage and the like of the city are increased; in addition, the hardened pavement obstructs the atmospheric evaporation circulation, so that the air humidity in the urban area is reduced, the air temperature is increased, and a 'heat island effect' is formed; for this reason, the country advocates and develops "sponge cities" vigorously.
The pervious concrete, also called porous concrete, sand-free concrete, pervious terrace, is a porous light concrete mixed by aggregate, cement, reinforcing agent and water, it does not contain fine aggregate, coat a thin layer of cement paste on the surface of coarse aggregate and cohere each other to form the cellular structure with evenly distributed pore space, so have ventilative, pervious to water and light in weight characteristics.
The pervious concrete firstly meets the strength requirement and simultaneously needs to keep a certain through hole to meet the requirement of water permeability, so that the aim of simultaneously ensuring the strength and the porosity is fulfilled by selecting proper raw materials and by a mixing proportion design, a preparation process and additives during preparation.
Disclosure of Invention
The invention aims to provide pervious concrete with high water permeability coefficient and capable of improving compressive strength, bending strength and impact strength and a preparation method thereof, aiming at the problems in the prior art.
In order to achieve the purpose, the invention adopts the technical scheme that:
the pervious concrete is prepared from the following raw materials in percentage by weight: 20-25% of cement, 50-60% of coarse aggregate, 5-10% of adhesive, 5-10% of polyethylene glycol, 5-10% of carbon nanotube-glass fiber-piperidine ionic liquid composite material and the balance of water.
Preferably, the piperidine ionic liquid is 1, 3-bis (4-hydroxy-1-methyl) -piperidine bromide ionic liquid.
The invention also provides a preparation method of the 1, 3-bis (4-hydroxy-1 methyl) -piperidine bromide ionic liquid, which comprises the following steps: dissolving 4-hydroxy-N-methylpiperidine in toluene, adding 1, 3-dibromopropane, carrying out oil bath at 80 ℃ with the molar ratio of 4-hydroxy-N-methylpiperidine to 1, 3-dibromopropane being 1:0.4, and carrying out condensation reflux reaction for 12h under the protection of nitrogen, thus obtaining the compound.
The 1, 3-bis (4-hydroxy-1 methyl) -piperidine bromide ionic liquid prepared by the preparation method has high purity and yield, and the preparation method is simple.
The invention also provides a preparation method of the carbon nanotube-glass fiber-piperidine ionic liquid composite material, which comprises the following steps:
s1, weighing 1-10 g of dried carbon nano tube and 1-1 x 103mixing mL of strong oxidizing acid, treating for 2-4 hours under 100-120 kHz ultrasonic wave, heating to 100-120 ℃, adding 1-103 g of dry glass fiber, stirring, refluxing, reacting for 15-24 hours, centrifuging, washing the solid to be neutral, and drying in vacuum at 40 ℃ to obtain an acidified carbon nanotube-glass fiber composite material;
s2, adding the acidified carbon nano tube-glass fiber composite material obtained in the step S1 into the solution of 0.01 mol.L-1In NaOH solution, the solid-to-liquid ratio is (1.0-1.2) mg: 1mL, stirring for 2h, centrifuging, washing the solid with water to neutrality, and vacuum drying at 40 ℃ to obtain the carbon nanotube-glass fiber composite material in an alkalization form;
s3, adding the 1, 3-bis (4-hydroxy-1 methyl) -piperidine bromide ionic liquid and the alkalized carbon nano tube-glass fiber composite material into water according to the mass ratio of 1:8-12, stirring and reacting for 2h at 40 ℃, centrifugally separating, washing solids with water, and then drying in vacuum at 40 ℃ to obtain the carbon nano tube-glass fiber composite material.
The ionic liquid prepared by the method contains hydroxyl groups, has the unique properties of no common organic solvent or water, such as simple structure, low melting point, strong dissolving capacity, low steam pressure and the like, and can be used as an additive, on one hand, the ionic liquid can be used as an antifreezing agent to enhance the pumpability of concrete in winter construction and improve the durability of the concrete, and on the other hand, the ionic liquid has good dissolving capacity, can increase the compatibility among the components and improve the workability of the concrete.
The carbon nanotube-glass fiber-piperidine ionic liquid composite material prepared by the method enables the surface of the glass fiber to be grafted with the carbon nanotube-piperidine ionic liquid, so that the surface of the glass fiber is modified, the interface bonding strength between the glass fiber and cement paste can be improved, and the compressive strength of concrete is improved; meanwhile, the lamellar net structure of the carbon nano tube has large specific surface area and high porosity, so that the water permeability coefficient of the concrete can be improved, and the bending and stretching performance and the impact resistance of the concrete can be improved by utilizing the good mechanical property of the carbon nano tube, thereby further improving the performance of the concrete and prolonging the service life of the concrete; and simultaneously, the ionic liquid is combined with the 1, 3-bis (4-hydroxy-1 methyl) -piperidine bromide ionic liquid through ionic bonds to form a composite material, so that the dispersion performance of the acidified carbon nanotube-glass fiber composite material can be effectively improved, and the acidified carbon nanotube-glass fiber composite material can be uniformly dispersed in a system.
Preferably, the coarse aggregate is in single-grade distribution, and the particle size is 5-20 mm.
Preferably, the adhesive is dispersible latex; the adhesive can increase the consistency of cement paste, so that the cement paste is more easily adhered to the aggregate, thereby reducing the cement paste from flowing into the bottom of the concrete and improving the permeability coefficient of the pervious concrete; meanwhile, the redispersible adhesive can improve the binding power between the cement paste and the aggregate, so that the strength of the pervious concrete is improved.
Preferably, the polyethylene glycol is prepared by mixing polyethylene glycol 20000 and polyethylene glycol 400 according to the weight ratio of 1: 0.5-1.
The polyethylene glycol side chain hydroxyl group can improve the fluidity and the dispersibility of concrete slurry, meanwhile, oxygen atoms in the polyethylene glycol side chain can be combined with free water in concrete mortar to fully hydrate the mortar, and free water contained in gel is released in the diffusion process of concrete particles and is combined with the long-chain branch chain polyethylene glycol group, so that the mortar has obvious retardation effect on the slurry, the workability of the concrete is improved, and the problems of cracks, breakage and the like after the concrete is condensed are avoided; meanwhile, the polyethylene glycol and the hydroxyl group and other components of the piperidine ionic liquid in the carbon nano tube-glass fiber-piperidine ionic liquid composite material are interacted through covalent bonds, hydrogen bonds, van der Waals force and the like, so that the stability of a concrete structure can be improved, and the strength of the concrete can be improved.
Preferably, the cement is portland cement with a mark number of not less than 42.5.
Preferably, the strong oxidizing acid is a mixed solution of hydrogen peroxide and hydrochloric acid with a molar ratio of 1/100-100/1.
The invention also provides a preparation method of the pervious concrete, which comprises the following steps: sequentially adding cement, coarse aggregate and the carbon nanotube-glass fiber-piperidine ionic liquid composite material into a stirrer according to the weight percentage of the formula, fully and uniformly stirring, respectively adding an adhesive, polyethylene glycol and water into the stirrer under the stirring condition, and continuously stirring for 5-10min to prepare the pervious concrete; the pervious concrete prepared by the preparation method disclosed by the invention not only can effectively enhance the binding power between the cement paste and the aggregate, but also can effectively improve the working performance of the concrete, improve the strength and the permeability coefficient of the concrete and prolong the service life of the concrete.
Compared with the prior art, the invention has the beneficial effects that:
(1) according to the invention, the carbon nanotube-glass fiber-piperidine ionic liquid composite material is added in a matching manner, and the compressive strength of the concrete can be improved by using the modified glass fiber; the piperidine ionic liquid can enhance the pumpability of concrete in winter construction and improve the durability of concrete, and meanwhile, the piperidine ionic liquid has good solubility, can increase the compatibility among various components and improve the workability of concrete; the carbon nano tube can improve the bending tensile property and the compressive strength of the concrete and simultaneously improve the water permeability of the concrete; the concrete prepared from the carbon nanotube-glass fiber-piperidine ionic liquid composite material can effectively enhance the binding force between cement paste and aggregate, remarkably improve the strength and the water permeability coefficient of the concrete and prolong the service life of the concrete.
(2) The polyethylene glycol and carbon nanotube-glass fiber-piperidine ionic liquid composite material in the pervious concrete has the advantages that the stability of a concrete structure is improved and the compression resistance is improved through the interaction of covalent bonds, hydrogen bonds, Van der Waals force and the like with other components.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail with reference to the following embodiments.
It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention; reagents, methods and apparatus used in the present invention are conventional in the art unless otherwise indicated.
The present invention will be further described with reference to the following embodiments.
Example 1
A preparation method of 1, 3-bis (4-hydroxy-1 methyl) -piperidine bromide ionic liquid comprises the following steps: dissolving 4-hydroxy-N-methylpiperidine in toluene, adding 1, 3-dibromopropane, carrying out oil bath at 80 ℃ with the molar ratio of 4-hydroxy-N-methylpiperidine to 1, 3-dibromopropane being 1:0.4, and carrying out condensation reflux reaction for 12h under the protection of nitrogen, thus obtaining the compound.
The preparation method of the carbon nanotube-glass fiber-piperidine ionic liquid composite material comprises the following steps:
s1, weighing 1g of dry carbon nanotube, mixing with 10mL of strong oxidizing acid, treating for 2 hours under 100kHz ultrasonic wave, heating to 100 ℃, adding 100g of dry glass fiber, stirring, refluxing, reacting for 20 hours, centrifugally separating, washing the solid to be neutral by water, and drying in vacuum at 40 ℃ to obtain an acidified carbon nanotube-glass fiber composite material;
s2, adding the acidified carbon nano tube-glass fiber composite material obtained in the step S1 into the solution of 0.01 mol.L-1In NaOH solution, the solid-to-liquid ratio is 1.2 mg: 1mL, stirringCentrifuging for 2h, washing the solid to be neutral by water, and drying in vacuum at 40 ℃ to obtain the carbon nano tube-glass fiber composite material in an alkalization form;
s3, adding the 1, 3-bis (4-hydroxy-1 methyl) -piperidine bromide ionic liquid and the alkalized carbon nano tube-glass fiber composite material into water according to the mass ratio of 1:10, stirring and reacting for 1h at 40 ℃, centrifugally separating, washing solids with water, and then drying in vacuum at 40 ℃ to obtain the carbon nano tube-glass fiber composite material.
The strong oxidizing acid is hydrogen peroxide and hydrochloric acid, and the molar ratio of the hydrogen peroxide to the hydrochloric acid is 1: 100 are mixed to obtain the product.
The pervious concrete is prepared from the following raw materials in percentage by weight: 20% of cement, 60% of coarse aggregate, 5% of adhesive, 5% of polyethylene glycol, 8% of carbon nanotube-glass fiber-piperidine ionic liquid composite material and the balance of water.
Wherein the adhesive is dispersible latex with the fineness of 100 meshes; the particle size of the coarse aggregate is 5-20 mm; the cement is 42.5 ordinary portland cement; the polyethylene glycol is prepared by mixing polyethylene glycol 20000 and polyethylene glycol 400 according to the weight ratio of 1: 0.8.
The preparation method of the pervious concrete comprises the following steps: sequentially adding cement, coarse aggregate and the carbon nanotube-glass fiber-piperidine ionic liquid composite material into a stirrer according to the weight percentage of the formula, fully and uniformly stirring, respectively adding the adhesive, polyethylene glycol and water into the stirrer under the stirring condition, and continuously stirring for 5-10min to obtain the pervious concrete.
Example 2
The preparation method of the 1, 3-bis (4-hydroxy-1 methyl) -piperidine bromide ionic liquid is the same as that of the example 1.
The preparation method of the carbon nanotube-glass fiber-piperidine ionic liquid composite material comprises the following steps:
s1, weighing 1g of dry carbon nanotube, mixing with 500mL of strong oxidizing acid, treating for 3 hours under 120kHz ultrasonic wave, heating to 120 ℃, adding 1000g of dry glass fiber, stirring, refluxing, reacting for 24 hours, centrifugally separating, washing the solid to be neutral by water, and drying in vacuum at 40 ℃ to obtain an acidified carbon nanotube-glass fiber composite material;
s2, adding the acidified carbon nano tube-glass fiber composite material obtained in the step S1 into the solution of 0.01 mol.L-1In NaOH solution, the solid-to-liquid ratio is 1.0 mg: 1mL, stirring for 2h, centrifuging, washing the solid with water to neutrality, and vacuum drying at 40 ℃ to obtain the carbon nanotube-glass fiber composite material in an alkalization form;
s3, adding the 1, 3-bis (4-hydroxy-1 methyl) -piperidine bromide ionic liquid and the alkalized carbon nano tube-glass fiber composite material into water according to the mass ratio of 1:12, stirring and reacting for 2 hours at 40 ℃, centrifugally separating, washing solids with water, and then drying in vacuum at 40 ℃ to obtain the carbon nano tube-glass fiber composite material.
The strong oxidizing acid is hydrogen peroxide and hydrochloric acid, and the molar ratio of the hydrogen peroxide to the hydrochloric acid is 1:1, and (2).
The pervious concrete is prepared from the following raw materials in percentage by weight: 25% of cement, 50% of coarse aggregate, 5% of adhesive, 5% of polyethylene glycol, 10% of carbon nanotube-glass fiber-piperidine ionic liquid composite material and the balance of water; the polyethylene glycol is prepared by mixing polyethylene glycol 20000 and polyethylene glycol 400 according to the weight ratio of 1: 0.5.
The preparation method of the pervious concrete is the same as that of the embodiment 1.
Example 3
The preparation method of the 1, 3-bis (4-hydroxy-1 methyl) -piperidine bromide ionic liquid is the same as that of the example 1.
The preparation method of the carbon nanotube-glass fiber-piperidine ionic liquid composite material comprises the following steps:
s1, weighing 1g of dried carbon nano tube and 10g of dried carbon nano tube3mixing mL of strong oxidizing acid, treating for 6 hours under 110kHz ultrasonic wave, heating to 90 ℃, adding 1000g of dried glass fiber, stirring, refluxing and reacting for 15 hours, centrifugally separating, washing the solid to be neutral by water, and drying in vacuum at 40 ℃ to obtain an acidified carbon nanotube-glass fiber composite material;
s2, adding the acidified carbon nano tube-glass fiber composite material obtained in the step S1 into the solution of 0.01 mol.L-1In NaOH solution, the solid-to-liquid ratio is 1.1 mg: 1mL, stirringStirring for 2h, centrifuging, washing the solid with water to neutrality, and vacuum drying at 40 deg.C to obtain alkalized carbon nanotube-glass fiber composite material;
s3, adding the 1, 3-bis (4-hydroxy-1 methyl) -piperidine bromide ionic liquid and the alkalized carbon nano tube-glass fiber composite material into water according to the mass ratio of 1:8, stirring and reacting for 1h at 40 ℃, centrifugally separating, washing solids with water, and then drying in vacuum at 40 ℃ to obtain the carbon nano tube-glass fiber composite material.
The strong oxidizing acid is hydrogen peroxide and hydrochloric acid according to a molar ratio of 100: 1, and (2).
The pervious concrete is prepared from the following raw materials in percentage by weight: 20% of cement, 50% of coarse aggregate, 10% of adhesive, 10% of polyethylene glycol, 5% of carbon nanotube-glass fiber-piperidine ionic liquid composite material and the balance of water; the polyethylene glycol is prepared by mixing polyethylene glycol 20000 and polyethylene glycol 400 according to the weight ratio of 1:1.
The preparation method of the pervious concrete is the same as that of the embodiment 1.
Comparative example 1
The embodiment provides a pervious concrete, which is different from the pervious concrete in embodiment 1 in that the pervious concrete is prepared from the following raw materials in percentage by weight: 20% of cement, 60% of coarse aggregate, 5% of adhesive, 13% of polyethylene glycol and the balance of water, wherein the balance is the same as that in the example 1.
Comparative example 2
The embodiment provides a pervious concrete, which is different from the pervious concrete in embodiment 1 in that the pervious concrete is prepared from the following raw materials in percentage by weight: 20% of cement, 60% of coarse aggregate, 5% of adhesive, 5% of polyethylene glycol, 8% of carbon nanotube-piperidine ionic liquid composite material and the balance of water.
The preparation method of the carbon nanotube-piperidine ionic liquid composite material comprises the following steps:
s1, weighing 1g of dry carbon nano tube, mixing with 10mL of strong oxidizing acid, treating for 2 hours under 100kHz ultrasonic wave, heating to 100 ℃, stirring, refluxing, reacting for 20 hours, centrifugally separating, washing the solid to be neutral by water, and drying in vacuum at 40 ℃ to obtain an acidified carbon nano tube;
s2, adding the acidified carbon nano-tube obtained in the step S1 to 0.01 mol.L-1In NaOH solution, the solid-to-liquid ratio is 1.2 mg: 1mL, stirring for 2h, centrifuging, washing the solid with water to neutrality, and vacuum drying at 40 ℃ to obtain the alkalized carbon nanotube;
s3, adding the 1, 3-bis (4-hydroxy-1 methyl) -piperidine bromide ionic liquid and the alkalized carbon nano tube into water according to the mass ratio of 1:10, stirring and reacting for 1h at 40 ℃, centrifugally separating, washing the solid with water, and then drying in vacuum at 40 ℃ to obtain the product.
Comparative example 3
The embodiment provides a pervious concrete, which is different from the pervious concrete in embodiment 1 in that the pervious concrete is prepared from the following raw materials in percentage by weight: 20% of cement, 50% of coarse aggregate, 10% of adhesive, 8% of polyethylene glycol, 8% of acidified carbon nanotube-glass fiber composite material and the balance of water.
Comparative example 4
This example provides a pervious concrete, which is different from example 1 in that the polyethylene glycol is formed by mixing polyethylene glycol 20000 and polyethylene glycol 400 in a weight ratio of 1: 1.5.
Comparative example 5
This example provides a pervious concrete, which is different from example 1 in that the coarse aggregate has a particle size of 1 to 5 mm.
Comparative example 6
This example provides a pervious concrete, which is different from example 1 in that the preparation method of 1, 3-bis (4-hydroxy-1 methyl) -piperidine bromide ionic liquid is as follows: dissolving 4-hydroxy-N-methylpiperidine in toluene, adding 1, 3-dibromopropane, carrying out oil bath at 80 ℃ with the molar ratio of 4-hydroxy-N-methylpiperidine to 1, 3-dibromopropane being 1:1, and carrying out condensation reflux reaction for 12h under the protection of nitrogen.
Application example
The pervious concrete prepared in examples 1 to 3 and comparative examples 1 to 6 were subjected to a conventional performance index test, and the results are shown in table 1 below.
Figure BDA0002671931040000101
As can be seen from the results in the above table, the carbon nanotube-glass fiber-piperidine ionic liquid composite material provided by the present invention is added in all of embodiments 1 to 3, and the results show that the 28d compressive strength and the 28d flexural tensile strength of the pervious concrete prepared according to the weight percentage of the raw materials of the present invention are significantly improved, and the pervious concrete has a higher permeability coefficient, and the number of freeze-thaw resistant cycles of the pervious concrete can be increased, so that the service life of the pervious concrete is prolonged, and the performance of embodiment 1 is optimal.
In the pervious concrete in the comparative example 1, the carbon nanotube-glass fiber-piperidine ionic liquid composite material is not added, and all the conventional performance indexes of the pervious concrete prepared by the pervious concrete are reduced, which shows that the carbon nanotube-glass fiber-piperidine ionic liquid composite material plays a key role in improving the performance of the pervious concrete.
Comparative example 2 the composite material added to the pervious concrete has no glass fiber, so that the conventional performance indexes of the pervious concrete prepared by the method are obviously reduced, particularly the compressive strength of the concrete is reduced most obviously, and the glass fiber plays an important role in improving the compressive strength of the pervious concrete.
Comparative example 3 the composite material added to the pervious concrete is not compounded with the pyridine ionic liquid, and various conventional performance indexes of the pervious concrete are obviously reduced, particularly the times of freeze-thaw resistance cycles, which shows that the pyridine ionic liquid plays an important role in improving the frost resistance of the pervious concrete.
And in the comparative example 4, the weight ratio of the polyethylene glycol is changed, so that various conventional performance indexes of the prepared pervious concrete are obviously reduced, and the change of the weight ratio of the polyethylene glycol can influence the viscosity of the polyethylene glycol, so that the prepared pervious concrete cannot reach the optimal performance.
Comparative example 5 pervious concrete with the particle size of the coarse aggregate changed, the porosity of the pervious concrete prepared was significantly reduced, probably due to the smaller particle size of the coarse aggregate and the increased compactness of the concrete.
Comparative example 6 changing the preparation method of the 1, 3-bis (4-hydroxy-1 methyl) -piperidine bromide ionic liquid and changing the molar ratio of 4-hydroxy-N-methylpiperidine to 1, 3-dibromopropane, a small amount of 4-hydroxy-1-methyl-1- (3-bromopropyl) -piperidine bromide is generated, so that the acting force between the ionic liquid and other components is weakened, and various conventional performance indexes of the pervious concrete prepared therefrom are lowered.
In conclusion, the pervious concrete provided by the invention has reasonable raw material component compatibility, can well meet the requirements of relevant national standards and practical application, and has excellent popularization and application prospects.
While the invention has been described with respect to specific embodiments thereof, it will be understood by those skilled in the art that the foregoing and other changes, omissions and deviations in the form and detail thereof may be made without departing from the scope of this invention.
Those skilled in the art should appreciate that they can readily use the disclosed conception and specific embodiments as a basis for designing or modifying other structures for carrying out the same purposes of the present invention without departing from the spirit and scope of the invention; meanwhile, any equivalent changes, modifications and alterations of the above embodiments according to the spirit and techniques of the present invention are also within the scope of the present invention.

Claims (8)

1. The preparation method of the pervious concrete is characterized by comprising the following steps: step one, preparing a vitamin-piperidine ionic liquid composite material, and screening coarse aggregate to obtain coarse aggregate with the particle size of 5-20 mm; step two, weighing the following raw materials in percentage by weight: 20-25% of cement, 50-60% of coarse aggregate, 5-10% of adhesive, 5-10% of polyethylene glycol, 5-10% of carbon nanotube-glass fiber-piperidine ionic liquid composite material and the balance of water; and step three, sequentially adding cement, coarse aggregate, the carbon nano tube-glass fiber-piperidine ionic liquid composite material into a stirrer, fully and uniformly stirring, respectively adding the adhesive, polyethylene glycol and water into the stirrer under the stirring condition, and continuously stirring for 5-10min to obtain the pervious concrete.
2. The method for preparing pervious concrete according to claim 1, wherein the strong oxidizing acid is a mixture of hydrogen peroxide and hydrochloric acid in a molar ratio of 1/100-100/1.
3. The method of claim 1, wherein the cement is portland cement no less than 42.5.
4. The method for preparing pervious concrete according to claim 1, wherein the polyethylene glycol is prepared by mixing polyethylene glycol 20000 and polyethylene glycol 400 according to a weight ratio of 1: 0.5-1.
5. The method for preparing pervious concrete according to claim 1, wherein the adhesive is dispersible latex.
6. The method for preparing pervious concrete according to claim 1, wherein the piperidine ionic liquid is 1, 3-bis (4-hydroxy-1-methyl) -piperidine bromide ionic liquid.
7. The method for preparing pervious concrete according to claim 6, wherein the step of preparing the carbon nanotube-glass fiber-piperidine ionic liquid composite material comprises the following steps:
s1, weighing 1-10 g of dried carbon nano tube and 1-1 x 103mixing mL of strong oxidizing acid, treating for 2-4 hours under 100-120 kHz ultrasonic wave, heating to 100-120 ℃, and adding 1-103g, stirring and refluxing the dried glass fiber, reacting for 15-24 hours, centrifugally separating, washing the solid to be neutral by water, and drying in vacuum at 40 ℃ to obtain an acidified carbon nanotube-glass fiber composite material;
s2, mixing the acidified carbon nano tube-glass obtained in the step S1Adding the fiber composite material to 0.01 mol.L-1In NaOH solution, the solid-to-liquid ratio is (1.0-1.2) mg: 1mL, stirring for 2h, centrifuging, washing the solid with water to neutrality, and vacuum drying at 40 ℃ to obtain the carbon nanotube-glass fiber composite material in an alkalization form;
s3, adding the 1, 3-bis (4-hydroxy-1 methyl) -piperidine bromine salt ionic liquid and the alkalized carbon nano tube-glass fiber composite material into water according to the mass ratio of 1:8-12, stirring and reacting for 2h at 40 ℃, centrifugally separating, washing solids with water, and then drying in vacuum at 40 ℃ to obtain the carbon nano tube-glass fiber composite material.
8. The method for preparing pervious concrete according to claim 6, wherein the 1, 3-bis (4-hydroxy-1 methyl) -piperidine bromide ionic liquid is prepared by the following steps: dissolving 4-hydroxy-N-methylpiperidine in toluene, adding 1, 3-dibromopropane, carrying out oil bath at 80 ℃ with the molar ratio of 4-hydroxy-N-methylpiperidine to 1, 3-dibromopropane being 1:0.4, and carrying out condensation reflux reaction for 12h under the protection of nitrogen, thus obtaining the compound.
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