CN114249566A - Anti-crack concrete and preparation method thereof - Google Patents

Anti-crack concrete and preparation method thereof Download PDF

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CN114249566A
CN114249566A CN202111458235.1A CN202111458235A CN114249566A CN 114249566 A CN114249566 A CN 114249566A CN 202111458235 A CN202111458235 A CN 202111458235A CN 114249566 A CN114249566 A CN 114249566A
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parts
crack
trioxo
triazine
hydroxyethyl
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万建平
程子豪
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    • CCHEMISTRY; METALLURGY
    • C04CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04BLIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B28/00Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
    • C04B28/02Compositions 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
    • C04B28/04Portland cements
    • CCHEMISTRY; METALLURGY
    • C04CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04BLIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B14/00Use of inorganic materials as fillers, e.g. pigments, for mortars, concrete or artificial stone; Treatment of inorganic materials specially adapted to enhance their filling properties in mortars, concrete or artificial stone
    • C04B14/02Granular materials, e.g. microballoons
    • C04B14/022Carbon
    • CCHEMISTRY; METALLURGY
    • C04CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04BLIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B16/00Use of organic materials as fillers, e.g. pigments, for mortars, concrete or artificial stone; Treatment of organic materials specially adapted to enhance their filling properties in mortars, concrete or artificial stone
    • C04B16/04Macromolecular compounds
    • C04B16/06Macromolecular compounds fibrous
    • CCHEMISTRY; METALLURGY
    • C04CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04BLIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B18/00Use of agglomerated or waste materials or refuse as fillers for mortars, concrete or artificial stone; Treatment of agglomerated or waste materials or refuse, specially adapted to enhance their filling properties in mortars, concrete or artificial stone
    • C04B18/04Waste materials; Refuse
    • CCHEMISTRY; METALLURGY
    • C04CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04BLIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B18/00Use of agglomerated or waste materials or refuse as fillers for mortars, concrete or artificial stone; Treatment of agglomerated or waste materials or refuse, specially adapted to enhance their filling properties in mortars, concrete or artificial stone
    • C04B18/04Waste materials; Refuse
    • C04B18/12Waste materials; Refuse from quarries, mining or the like
    • CCHEMISTRY; METALLURGY
    • C04CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04BLIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B24/00Use of organic materials as active ingredients for mortars, concrete or artificial stone, e.g. plasticisers
    • C04B24/16Sulfur-containing compounds
    • C04B24/161Macromolecular compounds comprising sulfonate or sulfate groups
    • C04B24/166Macromolecular compounds comprising sulfonate or sulfate groups obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
    • CCHEMISTRY; METALLURGY
    • C08ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08GMACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
    • C08G63/00Macromolecular compounds obtained by reactions forming a carboxylic ester link in the main chain of the macromolecule
    • C08G63/68Polyesters containing atoms other than carbon, hydrogen and oxygen
    • C08G63/688Polyesters containing atoms other than carbon, hydrogen and oxygen containing sulfur
    • C08G63/6884Polyesters containing atoms other than carbon, hydrogen and oxygen containing sulfur derived from polycarboxylic acids and polyhydroxy compounds
    • C08G63/6886Dicarboxylic acids and dihydroxy compounds
    • CCHEMISTRY; METALLURGY
    • C04CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04BLIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B2111/00Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
    • C04B2111/20Resistance against chemical, physical or biological attack
    • C04B2111/2038Resistance against physical degradation
    • CCHEMISTRY; METALLURGY
    • C04CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04BLIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B2111/00Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
    • C04B2111/20Resistance against chemical, physical or biological attack
    • C04B2111/27Water resistance, i.e. waterproof or water-repellent materials
    • CCHEMISTRY; METALLURGY
    • C04CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04BLIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B2201/00Mortars, concrete or artificial stone characterised by specific physical values
    • C04B2201/50Mortars, concrete or artificial stone characterised by specific physical values for the mechanical strength
    • C04B2201/52High compression strength concretes, i.e. with a compression strength higher than about 55 N/mm2, e.g. reactive powder concrete [RPC]
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02WCLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
    • Y02W30/00Technologies for solid waste management
    • Y02W30/50Reuse, recycling or recovery technologies
    • Y02W30/91Use of waste materials as fillers for mortars or concrete

Abstract

The invention discloses anti-crack concrete which is characterized by comprising the following components in parts by weight: 25-35 parts of cement, 2-4 parts of polyamidoxime functionalized hyperbranched nano-diamond, 5-8 parts of gangue powder, 15-25 parts of crushed stone, 3-5 parts of boron-rich slag powder, 30-40 parts of river sand, 1-3 parts of chitosan nano-fiber, 0.5-0.8 part of dihydro-2, 4, 6-trioxo-1, 3, 5-triazine-1, 3(2H,4H) -dipropionic acid/N, N-bis (2-hydroxyethyl) -2-aminoethanesulfonic acid polycondensate and 10-15 parts of water. The invention also discloses a preparation method of the anti-crack concrete. The anti-crack concrete disclosed by the invention has the advantages of high strength, good impact resistance, obvious anti-crack and anti-permeability effects and long service life.

Description

Anti-crack concrete and preparation method thereof
Technical Field
The invention relates to the technical field of building materials, in particular to anti-crack concrete and a preparation method thereof.
Background
With the increase of the investment of infrastructure in China, the application of concrete is more and more extensive. The concrete is a heterogeneous porous brittle material, a large number of pores and microcracks exist in the concrete, the tensile strength is low, the concrete is lack of toughness, under the action of external factors such as load, temperature stress, alkali-aggregate reaction or foundation settlement, the pores and the microcracks can be continuously expanded, merged and polymerized to form macroscopic cracks, so that leakage is caused, the normal use function and durability of the concrete are influenced, and when the width of the cracks exceeds a certain limit, the bearing capacity, the rigidity and the normal use function of the concrete member are influenced, a path is provided for the permeation of chloride ions and the like, and a series of durability problems such as steel bar corrosion and the like are caused. Therefore, it is important to develop a crack-resistant concrete with excellent comprehensive properties.
The existing anti-crack concrete material has the defects of low strength, poor impact resistance, weak fireproof and anti-explosion performance, unobvious anti-crack and anti-permeability effects and short service life. For example, chinese patent application No. 201610500012.X discloses an anti-crack concrete, which comprises the following raw materials in parts by weight: 400-450 parts of a gel material, 700-800 parts of sand, 1000-1100 parts of stones, 150-190 parts of water and 5-15 parts of an additive; the gel material comprises cement, mineral powder and fly ash, the mass ratio of the cement to the mass sum of the mineral powder and the fly ash is 1.2-1.6, and the mass ratio of the mineral powder to the fly ash is 0.3-0.6. The concrete has better crack resistance, however, the tensile strength, the breaking strength, the impact resistance and the durability of the concrete need to be further improved, and the service life needs to be further prolonged.
Therefore, the crack-resistant concrete with high tensile strength, high breaking strength, good impact resistance, remarkable crack and seepage resistant effects and long service life is still needed in the field.
Disclosure of Invention
In order to overcome the defects in the prior art, the invention provides the crack-resistant concrete which has high strength, good shock resistance, obvious crack and permeability resistance effect and longer service life. Meanwhile, the invention also provides a preparation method of the anti-crack concrete.
In order to achieve the aim, the invention relates to anti-crack concrete which is characterized by comprising the following components in parts by weight: 25-35 parts of cement, 2-4 parts of polyamidoxime functionalized hyperbranched nano-diamond, 5-8 parts of gangue powder, 15-25 parts of crushed stone, 3-5 parts of boron-rich slag powder, 30-40 parts of river sand, 1-3 parts of chitosan nano-fiber, 0.5-0.8 part of dihydro-2, 4, 6-trioxo-1, 3, 5-triazine-1, 3(2H,4H) -dipropionic acid/N, N-bis (2-hydroxyethyl) -2-aminoethanesulfonic acid polycondensate and 10-15 parts of water.
Preferably, the method for preparing the condensation polymer of dihydro-2, 4, 6-trioxo-1, 3, 5-triazine-1, 3(2H,4H) -dipropionic acid/N, N-bis (2-hydroxyethyl) -2-aminoethanesulfonic acid comprises the following steps: adding dihydro-2, 4, 6-trioxo-1, 3, 5-triazine-1, 3(2H,4H) -dipropionic acid, N-bis (2-hydroxyethyl) -2-aminoethanesulfonic acid, a catalyst and a high-boiling point solvent into a high-pressure reaction kettle, replacing the air in the kettle with inert gas, carrying out esterification reaction for 3-5 hours at the temperature of 230-240 ℃ and the absolute pressure of 50-80 KPa, and then releasing the pressure to the normal pressure; and then under the vacuum condition, controlling the temperature between 250 ℃ and 270 ℃, stirring and reacting for 8-13H, cooling to room temperature after the reaction is finished, precipitating in ethanol, and finally drying to constant weight in a vacuum drying oven at the temperature of 80-90 ℃ to obtain the dihydro-2, 4, 6-trioxo-1, 3, 5-triazine-1, 3(2H,4H) -dipropionic acid/N, N-bis (2-hydroxyethyl) -2-aminoethanesulfonic acid polycondensate.
Preferably, the mole ratio of the dihydro-2, 4, 6-trioxo-1, 3, 5-triazine-1, 3(2H,4H) -dipropionic acid, the N, N-bis (2-hydroxyethyl) -2-aminoethanesulfonic acid, the catalyst and the high boiling point solvent is 1:1 (0.8-1.2) to (10-15).
Preferably, the catalyst is at least one of tetrabutyl titanate, methyl benzene sulfonic acid and titanium chloride; the high boiling point solvent is at least one of N-methyl pyrrolidone, N-dimethylformamide and N-methyl pyrrolidone.
Preferably, the diameter of the chitosan nano fiber is 15-40nm, and the length is 200-1000 nm.
Preferably, the river sand is 2-5 mm in specification.
Preferably, the particle size of the boron-rich slag powder is 300-600 meshes.
Preferably, the crushed stone has a particle size of 5-10 mm.
Preferably, the particle size of the coal gangue powder is 50-100 meshes.
Preferably, the polyamideimine oxime-functionalized hyperbranched nanodiamond is a polyamideimine oxime-functionalized hyperbranched nanodiamond prepared by the method of example 1 of the chinese patent application No. 201610637987.7.
Preferably, the cement is ordinary portland cement with one or more of the reference numbers 52.5, 52.5R, 62.5 or 62.5R.
Another object of the present invention is to provide a method for preparing the anti-crack concrete, which comprises the following steps: the components are mixed according to the weight part ratio, and are added into a stirrer to be stirred for 10-15 minutes, so that the anti-crack concrete is obtained.
Adopt the produced beneficial effect of above-mentioned technical scheme to lie in:
(1) the preparation method of the anti-crack concrete provided by the invention is simple and easy to control, has high preparation efficiency, is easy to realize mass production, and has good economic value.
(2) The anti-crack concrete provided by the invention overcomes the defects of low strength, poor impact resistance, weak fire and explosion resistance, unobvious anti-crack and anti-permeability effects and short service life of the existing anti-crack concrete material, and the prepared anti-crack concrete material has high strength, good impact resistance, remarkable anti-crack and anti-permeability effects and long service life through the synergistic effect of the components.
(3) The anti-cracking concrete provided by the invention has the advantages that the wastes such as the coal gangue powder and the boron-rich slag powder are reasonably utilized, the effect of changing waste into valuable is achieved, the environment protection is facilitated, and the resources can be saved; after the cement mortar is added into concrete, the dosage of cement can be reduced, the reinforcing effect is obvious, the compactness and the wear resistance of the concrete can be effectively improved, the wear resistance capability of the concrete is greatly improved, the toughness of the concrete is increased, and the anti-seepage cracking capability is improved.
(4) According to the crack-resistant concrete provided by the invention, the addition of the poly amidoxime functionalized hyperbranched nano-diamond can improve the compression strength and the bending strength of the concrete, reduce the drying shrinkage deformation of the concrete, improve the compatibility with other components, improve the anti-permeability and crack-resistant effects, enhance the compactness of the concrete, further improve the volume stability of the concrete, prolong the service life of the concrete and improve the product grade of the concrete.
(5) According to the anti-crack concrete provided by the invention, the chitosan nano fiber is added, so that the anti-permeability performance and anti-crack performance of the concrete can be effectively improved, the comprehensive performance and compressive strength of the concrete are improved, the hydrophilic group structure is contained in the molecular structure of the anti-crack concrete, the interface wettability can be improved, the compatibility among all components is improved, the components in the concrete are prevented from being unevenly dispersed, a large number of irregular stress concentration points exist, the workability of the concrete is effectively improved, and the comprehensive performance and performance stability of the concrete are improved. The condensation polymer of dihydro-2, 4, 6-trioxo-1, 3, 5-triazine-1, 3(2H,4H) -dipropionic acid/N, N-bis (2-hydroxyethyl) -2-aminoethanesulfonic acid can effectively reduce water, bleed air and retard coagulation, thereby improving the comprehensive performance and performance stability of concrete.
Detailed Description
In order to make the technical solutions of the present invention better understood and make the above features, objects, and advantages of the present invention more comprehensible, the present invention is further described with reference to the following examples. The examples are intended to illustrate the invention only and are not intended to limit the scope of the invention; in the embodiment, the polyamideimine oxime functionalized hyperbranched nanodiamond is a polyamideimine oxime functionalized hyperbranched nanodiamond prepared by the method in the embodiment 1 of the chinese patent application No. 201610637987.7.
Example 1
The anti-crack concrete is characterized by comprising the following components in parts by weight: 25 parts of cement, 2 parts of polyamidoxime functionalized hyperbranched nano-diamond, 5 parts of gangue powder, 15 parts of gravel, 3 parts of boron-rich slag powder, 30 parts of river sand, 1 part of chitosan nanofiber, 0.5 part of dihydro-2, 4, 6-trioxo-1, 3, 5-triazine-1, 3(2H,4H) -dipropionic acid/N, N-bis (2-hydroxyethyl) -2-aminoethanesulfonic acid polycondensate and 10 parts of water.
The preparation method of the dihydro-2, 4, 6-trioxo-1, 3, 5-triazine-1, 3(2H,4H) -dipropionic acid/N, N-bis (2-hydroxyethyl) -2-aminoethanesulfonic acid polycondensate comprises the following steps: adding dihydro-2, 4, 6-trioxo-1, 3, 5-triazine-1, 3(2H,4H) -dipropionic acid, N-bis (2-hydroxyethyl) -2-aminoethanesulfonic acid, a catalyst and a high-boiling point solvent into a high-pressure reaction kettle, replacing the air in the kettle with inert gas, carrying out esterification reaction for 3 hours at the temperature of 230 ℃ and the absolute pressure of 50KPa, and then releasing the pressure to the normal pressure; then under the vacuum condition, controlling the temperature between 250 ℃, stirring and reacting for 8H, cooling to room temperature after the reaction is finished, precipitating in ethanol, and finally drying in a vacuum drying oven at 80 ℃ to constant weight to obtain a condensation polymer of dihydro-2, 4, 6-trioxo-1, 3, 5-triazine-1, 3(2H,4H) -dipropionic acid/N, N-bis (2-hydroxyethyl) -2-aminoethanesulfonic acid; the mole ratio of the dihydro-2, 4, 6-trioxo-1, 3, 5-triazine-1, 3(2H,4H) -dipropionic acid to the N, N-bis (2-hydroxyethyl) -2-aminoethanesulfonic acid to the catalyst to the high-boiling-point solvent is 1:1:0.8: 10; the catalyst is tetrabutyl titanate; the high boiling point solvent is N-methyl pyrrolidone.
The diameter of the chitosan nanofiber is 15nm, and the length of the chitosan nanofiber is 200 nm; the specification of the river sand is 2 mm; the particle size of the boron-rich slag powder is 300 meshes; the particle size of the crushed stone is 5 mm; the particle size of the coal gangue powder is 50 meshes; the cement is ordinary portland cement designated 52.5.
The preparation method of the anti-crack concrete is characterized by comprising the following steps: the components are mixed according to the weight part ratio, and are added into a stirrer to be stirred for 10 minutes, so that the anti-crack concrete is obtained.
Example 2
The anti-crack concrete is characterized by comprising the following components in parts by weight: 27 parts of cement, 2.5 parts of polyamidoxime functionalized hyperbranched nano-diamond, 6 parts of gangue powder, 17 parts of crushed stone, 3.5 parts of boron-rich slag powder, 33 parts of river sand, 1.5 parts of chitosan nanofiber, 0.6 part of dihydro-2, 4, 6-trioxo-1, 3, 5-triazine-1, 3(2H,4H) -dipropionic acid/N, N-bis (2-hydroxyethyl) -2-aminoethanesulfonic acid polycondensate and 11 parts of water.
The preparation method of the dihydro-2, 4, 6-trioxo-1, 3, 5-triazine-1, 3(2H,4H) -dipropionic acid/N, N-bis (2-hydroxyethyl) -2-aminoethanesulfonic acid polycondensate comprises the following steps: adding dihydro-2, 4, 6-trioxo-1, 3, 5-triazine-1, 3(2H,4H) -dipropionic acid, N-bis (2-hydroxyethyl) -2-aminoethanesulfonic acid, a catalyst and a high-boiling point solvent into a high-pressure reaction kettle, replacing the air in the kettle with inert gas, carrying out esterification reaction for 3.5 hours at the temperature of 233 ℃ and the absolute pressure of 60KPa, and then releasing the pressure to the normal pressure; then under the vacuum condition, controlling the temperature between 255 ℃, stirring for reaction for 9H, cooling to room temperature after the reaction is finished, precipitating in ethanol, and finally drying in a vacuum drying oven at 83 ℃ to constant weight to obtain a condensation polymer of dihydro-2, 4, 6-trioxo-1, 3, 5-triazine-1, 3(2H,4H) -dipropionic acid/N, N-bis (2-hydroxyethyl) -2-aminoethanesulfonic acid; the mole ratio of the dihydro-2, 4, 6-trioxo-1, 3, 5-triazine-1, 3(2H,4H) -dipropionic acid to the N, N-bis (2-hydroxyethyl) -2-aminoethanesulfonic acid to the catalyst to the high-boiling-point solvent is 1:1:0.9: 12; the catalyst is methyl benzene sulfonic acid; the high boiling point solvent is N, N-dimethylformamide.
The diameter of the chitosan nanofiber is 20nm, and the length of the chitosan nanofiber is 400 nm; the river sand is 3mm in specification; the particle size of the boron-rich slag powder is 400 meshes; the particle size of the crushed stone is 6 mm; the particle size of the coal gangue powder is 60 meshes; the cement is ordinary portland cement with the reference number of 52.5R.
The preparation method of the anti-crack concrete is characterized by comprising the following steps: the components are mixed according to the weight part ratio, and are added into a stirrer to be stirred for 12 minutes, so that the anti-crack concrete is obtained.
Example 3
The anti-crack concrete is characterized by comprising the following components in parts by weight: 30 parts of cement, 3 parts of polyamidoxime functionalized hyperbranched nano-diamond, 6.5 parts of gangue powder, 20 parts of gravel, 4 parts of boron-rich slag powder, 35 parts of river sand, 2 parts of chitosan nanofiber, 0.65 part of dihydro-2, 4, 6-trioxo-1, 3, 5-triazine-1, 3(2H,4H) -dipropionic acid/N, N-bis (2-hydroxyethyl) -2-aminoethanesulfonic acid polycondensate and 13 parts of water.
The preparation method of the dihydro-2, 4, 6-trioxo-1, 3, 5-triazine-1, 3(2H,4H) -dipropionic acid/N, N-bis (2-hydroxyethyl) -2-aminoethanesulfonic acid polycondensate comprises the following steps: adding dihydro-2, 4, 6-trioxo-1, 3, 5-triazine-1, 3(2H,4H) -dipropionic acid, N-bis (2-hydroxyethyl) -2-aminoethanesulfonic acid, a catalyst and a high-boiling point solvent into a high-pressure reaction kettle, replacing the air in the kettle with inert gas, carrying out esterification reaction for 4 hours at 235 ℃ and 65KPa absolute pressure, and then releasing the pressure to normal pressure; then under the vacuum condition, controlling the temperature between 260 ℃, stirring and reacting for 10H, cooling to room temperature after the reaction is finished, precipitating in ethanol, and finally drying in a vacuum drying oven at 85 ℃ to constant weight to obtain a condensation polymer of dihydro-2, 4, 6-trioxo-1, 3, 5-triazine-1, 3(2H,4H) -dipropionic acid/N, N-bis (2-hydroxyethyl) -2-aminoethanesulfonic acid; the mole ratio of the dihydro-2, 4, 6-trioxo-1, 3, 5-triazine-1, 3(2H,4H) -dipropionic acid, N-bis (2-hydroxyethyl) -2-aminoethanesulfonic acid, the catalyst and the high-boiling-point solvent is 1:1:1: 13; the catalyst is titanium chloride; the high boiling point solvent is N-methyl pyrrolidone.
The diameter of the chitosan nanofiber is 30nm, and the length of the chitosan nanofiber is 600 nm; the river sand is 3.5mm in specification; the particle size of the boron-rich slag powder is 450 meshes; the particle size of the crushed stone is 7 mm; the particle size of the coal gangue powder is 80 meshes; the cement is ordinary portland cement designated 62.5.
The preparation method of the anti-crack concrete is characterized by comprising the following steps: the components are mixed according to the weight part ratio, and are added into a stirrer to be stirred for 13 minutes, so that the anti-crack concrete is obtained.
Example 4
The anti-crack concrete is characterized by comprising the following components in parts by weight: 33 parts of cement, 3.5 parts of polyamidoxime functionalized hyperbranched nano-diamond, 7.5 parts of gangue powder, 23 parts of crushed stone, 4.5 parts of boron-rich slag powder, 38 parts of river sand, 2.5 parts of chitosan nano-fiber, 0.75 part of dihydro-2, 4, 6-trioxo-1, 3, 5-triazine-1, 3(2H,4H) -dipropionic acid/N, N-bis (2-hydroxyethyl) -2-aminoethanesulfonic acid polycondensate and 14 parts of water.
The preparation method of the dihydro-2, 4, 6-trioxo-1, 3, 5-triazine-1, 3(2H,4H) -dipropionic acid/N, N-bis (2-hydroxyethyl) -2-aminoethanesulfonic acid polycondensate comprises the following steps: adding dihydro-2, 4, 6-trioxo-1, 3, 5-triazine-1, 3(2H,4H) -dipropionic acid, N-bis (2-hydroxyethyl) -2-aminoethanesulfonic acid, a catalyst and a high-boiling point solvent into a high-pressure reaction kettle, replacing the air in the kettle with inert gas, carrying out esterification reaction for 4.5 hours at the temperature of 238 ℃ and the absolute pressure of 75KPa, and then releasing the pressure to the normal pressure; then under the vacuum condition, controlling the temperature between 268 ℃, stirring and reacting for 12H, cooling to room temperature after the reaction is finished, precipitating in ethanol, and finally drying in a vacuum drying oven at 88 ℃ to constant weight to obtain a condensation polymer of dihydro-2, 4, 6-trioxo-1, 3, 5-triazine-1, 3(2H,4H) -dipropionic acid/N, N-bis (2-hydroxyethyl) -2-aminoethanesulfonic acid; the mole ratio of the dihydro-2, 4, 6-trioxo-1, 3, 5-triazine-1, 3(2H,4H) -dipropionic acid, the N, N-bis (2-hydroxyethyl) -2-aminoethanesulfonic acid, the catalyst and the high-boiling point solvent is 1:1:1.1: 14; the catalyst is formed by mixing tetrabutyl titanate, methyl benzenesulfonic acid and titanium chloride according to the mass ratio of 1:3: 5; the high boiling point solvent is formed by mixing N-methyl pyrrolidone, N-dimethylformamide and N-methyl pyrrolidone according to the mass ratio of 1:2: 3.
The diameter of the chitosan nanofiber is 35nm, and the length of the chitosan nanofiber is 900 nm; the river sand is 4.5mm in specification; the particle size of the boron-rich slag powder is 550 meshes; the particle size of the crushed stone is 9 mm; the particle size of the coal gangue powder is 90 meshes; the cement is prepared by mixing common Portland cement with the labels of 52.5, 52.5R, 62.5 and 62.5R according to the mass ratio of 1:2:4: 5.
The preparation method of the anti-crack concrete is characterized by comprising the following steps: the components are mixed according to the weight part ratio, and are added into a stirrer to be stirred for 14 minutes, so that the anti-crack concrete is obtained.
Example 5
The anti-crack concrete is characterized by comprising the following components in parts by weight: 35 parts of cement, 4 parts of polyamidoxime functionalized hyperbranched nano-diamond, 8 parts of gangue powder, 25 parts of gravel, 5 parts of boron-rich slag powder, 40 parts of river sand, 3 parts of chitosan nano-fiber, 0.8 part of dihydro-2, 4, 6-trioxo-1, 3, 5-triazine-1, 3(2H,4H) -dipropionic acid/N, N-bis (2-hydroxyethyl) -2-aminoethanesulfonic acid polycondensate and 15 parts of water.
The preparation method of the dihydro-2, 4, 6-trioxo-1, 3, 5-triazine-1, 3(2H,4H) -dipropionic acid/N, N-bis (2-hydroxyethyl) -2-aminoethanesulfonic acid polycondensate comprises the following steps: adding dihydro-2, 4, 6-trioxo-1, 3, 5-triazine-1, 3(2H,4H) -dipropionic acid, N-bis (2-hydroxyethyl) -2-aminoethanesulfonic acid, a catalyst and a high-boiling point solvent into a high-pressure reaction kettle, replacing the air in the kettle with inert gas, carrying out esterification reaction for 5 hours at the temperature of 240 ℃ and the absolute pressure of 80KPa, and then releasing the pressure to the normal pressure; then under the vacuum condition, controlling the temperature between 270 ℃, stirring and reacting for 13H, cooling to room temperature after the reaction is finished, precipitating in ethanol, and finally drying in a vacuum drying oven at 90 ℃ to constant weight to obtain a condensation polymer of dihydro-2, 4, 6-trioxo-1, 3, 5-triazine-1, 3(2H,4H) -dipropionic acid/N, N-bis (2-hydroxyethyl) -2-aminoethanesulfonic acid; the mole ratio of the dihydro-2, 4, 6-trioxo-1, 3, 5-triazine-1, 3(2H,4H) -dipropionic acid to the N, N-bis (2-hydroxyethyl) -2-aminoethanesulfonic acid to the catalyst to the high-boiling-point solvent is 1:1:1.2: 15; the catalyst is tetrabutyl titanate; the high boiling point solvent is N, N-dimethylformamide.
The diameter of the chitosan nanofiber is 40nm, and the length of the chitosan nanofiber is 1000 nm; the river sand is 5mm in specification; the particle size of the boron-rich slag powder is 600 meshes; the particle size of the crushed stone is 10 mm; the particle size of the coal gangue powder is 100 meshes; the cement is ordinary portland cement with the reference number of 62.5R.
The preparation method of the anti-crack concrete is characterized by comprising the following steps: the components are mixed according to the weight part ratio, and are added into a stirrer to be stirred for 15 minutes, so that the anti-crack concrete is obtained.
Comparative example 1
The formula and the preparation method of the anti-crack concrete are basically the same as those of example 1, except that no polyamidoxime functionalized hyperbranched nano-diamond is added.
Comparative example 2
A crack resistant concrete having substantially the same formulation and preparation method as in example 1 except that a dihydro-2, 4, 6-trioxo-1, 3, 5-triazine-1, 3(2H,4H) -dipropionic acid/N, N-bis (2-hydroxyethyl) -2-aminoethanesulfonic acid polycondensate was not added.
Comparative example 3
An anti-crack concrete, whose formulation and preparation method are substantially the same as those of example 1, except that chitosan nanofibers are not added.
Comparative example 4
The formula and the preparation method of the anti-cracking concrete are basically the same as those of the concrete in the example 1, except that boron-rich slag powder is not added.
In order to illustrate the technical effects of the embodiments of the invention, the anti-crack concretes of the embodiments 1 to 5 and the comparative examples 1 to 4 are respectively subjected to sampling test on the compressive strength (28d), the impermeability and the early anti-cracking performance by referring to GB/T50081-2002 Standard test method for mechanical properties of ordinary concrete and GB/T50082-2009 Standard test method for Long-term Performance and durability of ordinary concrete, and the test results are shown in Table 1.
TABLE 1
Item Grade of impermeability Compressive strength (28d) Compressive strength (7d) Area of cracking per unit area
Unit of Stage MPa MPa mm2/m2
Example 1 >P12 58.3 50.1 328.2
Example 2 >P12 59.1 51.8 325.6
Example 3 >P12 61.6 52.2 323.4
Example 4 >P12 62.3 53.2 320.0
Example 5 >P12 63.2 54.4 318.7
Comparative example 1 P8 52.8 40.7 735.3
Comparative example 2 P10 53.5 41.3 556.1
Comparative example 3 P8 49.7 38.3 790.6
Comparative example 4 P10 53.2 41.5 562.5
As can be seen from table 1, the crack-resistant concrete disclosed in the examples of the present invention has more excellent compressive strength, impermeability and crack resistance, as a result of the synergistic effect of the components, compared to the comparative product.
The foregoing shows and describes the general principles, essential features, and advantages of the invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are merely illustrative of the principles of the invention, but that various changes and modifications may be made without departing from the spirit and scope of the invention, which fall within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.

Claims (9)

1. The anti-crack concrete is characterized by comprising the following components in parts by weight: 25-35 parts of cement, 2-4 parts of polyamidoxime functionalized hyperbranched nano-diamond, 5-8 parts of gangue powder, 15-25 parts of crushed stone, 3-5 parts of boron-rich slag powder, 30-40 parts of river sand, 1-3 parts of chitosan nano-fiber, 0.5-0.8 part of dihydro-2, 4, 6-trioxo-1, 3, 5-triazine-1, 3(2H,4H) -dipropionic acid/N, N-bis (2-hydroxyethyl) -2-aminoethanesulfonic acid polycondensate and 10-15 parts of water.
2. The crack-resistant concrete according to claim 1, wherein the dihydro-2, 4, 6-trioxo-1, 3, 5-triazine-1, 3(2H,4H) -dipropionic acid/N, N-bis (2-hydroxyethyl) -2-aminoethanesulfonic acid polycondensate is prepared by a method comprising the steps of: adding dihydro-2, 4, 6-trioxo-1, 3, 5-triazine-1, 3(2H,4H) -dipropionic acid, N-bis (2-hydroxyethyl) -2-aminoethanesulfonic acid, a catalyst and a high-boiling point solvent into a high-pressure reaction kettle, replacing the air in the kettle with inert gas, carrying out esterification reaction for 3-5 hours at the temperature of 230-240 ℃ and the absolute pressure of 50-80 KPa, and then releasing the pressure to the normal pressure; and then under the vacuum condition, controlling the temperature between 250 ℃ and 270 ℃, stirring and reacting for 8-13H, cooling to room temperature after the reaction is finished, precipitating in ethanol, and finally drying to constant weight in a vacuum drying oven at the temperature of 80-90 ℃ to obtain the dihydro-2, 4, 6-trioxo-1, 3, 5-triazine-1, 3(2H,4H) -dipropionic acid/N, N-bis (2-hydroxyethyl) -2-aminoethanesulfonic acid polycondensate.
3. The crack-resistant concrete according to claim 2, wherein the mole ratio of the dihydro-2, 4, 6-trioxo-1, 3, 5-triazine-1, 3(2H,4H) -dipropionic acid, the N, N-bis (2-hydroxyethyl) -2-aminoethanesulfonic acid, the catalyst and the high-boiling solvent is 1:1 (0.8-1.2) to (10-15).
4. The crack-resistant concrete according to claim 2, wherein the catalyst is at least one of tetrabutyl titanate, methyl benzene sulfonic acid and titanium chloride; the high boiling point solvent is at least one of N-methyl pyrrolidone, N-dimethylformamide and N-methyl pyrrolidone.
5. The anti-crack concrete as claimed in claim 1, wherein the chitosan nanofibers have a diameter of 15-40nm and a length of 200-1000 nm.
6. The crack-resistant concrete according to claim 1, wherein the river sand has a size of 2-5 mm; the particle size of the boron-rich slag powder is 300-600 meshes.
7. The crack-resistant concrete according to claim 1, wherein the crushed stone has a particle size of 5 to 10 mm; the particle size of the coal gangue powder is 50-100 meshes.
8. The crack-resistant concrete according to claim 1, wherein the cement is Portland cement designated by one or more of 52.5, 52.5R, 62.5 or 62.5R.
9. A method for preparing crack-resistant concrete according to any one of claims 1 to 8, comprising the steps of: the components are mixed according to the weight part ratio, and are added into a stirrer to be stirred for 10-15 minutes, so that the anti-crack concrete is obtained.
CN202111458235.1A 2021-12-02 2021-12-02 Anti-crack concrete and preparation method thereof Pending CN114249566A (en)

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