CN115108765B - High-strength corrosion-resistant concrete and preparation method thereof - Google Patents

High-strength corrosion-resistant concrete and preparation method thereof Download PDF

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CN115108765B
CN115108765B CN202210801409.8A CN202210801409A CN115108765B CN 115108765 B CN115108765 B CN 115108765B CN 202210801409 A CN202210801409 A CN 202210801409A CN 115108765 B CN115108765 B CN 115108765B
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tio
parts
fly ash
mixing
carbon fiber
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CN115108765A (en
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李兴奎
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Sichuan College of Architectural 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
    • 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
    • C04B18/00—Use 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
    • C04B18/04—Waste materials; Refuse
    • C04B18/06—Combustion residues, e.g. purification products of smoke, fumes or exhaust gases
    • C04B18/08—Flue dust, i.e. fly ash
    • 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
    • C04B40/00—Processes, in general, for influencing or modifying the properties of mortars, concrete or artificial stone compositions, e.g. their setting or hardening ability
    • C04B40/0028—Aspects relating to the mixing step of the mortar preparation
    • C04B40/0039—Premixtures of ingredients
    • C04B40/0046—Premixtures of ingredients characterised by their processing, e.g. sequence of mixing the ingredients when preparing the premixtures
    • 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
    • C04B2111/00008—Obtaining or using nanotechnology related materials
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
    • C04B2111/20—Resistance against chemical, physical or biological attack
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
    • C04B2201/50—Mortars, concrete or artificial stone characterised by specific physical values for the mechanical strength
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
    • Y02W30/00—Technologies for solid waste management
    • Y02W30/50—Reuse, recycling or recovery technologies
    • Y02W30/91—Use of waste materials as fillers for mortars or concrete

Abstract

The invention relates to high-strength corrosion-resistant concrete and a preparation method thereof, belonging to the technical field of concrete, and comprising the following raw materials: cement, water, sand, cobble, additive, carbon fibre-Ti O 2 Composite material and modified fly ash; carbon fiber-TIO 2 The composite material is prepared by the following steps: mixing carbon fibers with HC solution to obtain pretreated carbon fibers; adding tetraethylenepentamine into ethanol and water, mixing, adding TIO 2 Transferring the nano particles into an autoclave, adding pretreated carbon fibers to obtain carbon fibers-TiO 2 A composite material. The dispersibility of the fly ash in concrete is increased by carrying out surface hydroxylation on the fly ash, and the dispersion of the fly ash in concrete is improved by carrying out surface hydroxylation on carbon fiber and aminated TiO 2 The composite addition not only increases the strength of the concrete, but also ensures that CO is captured in the concrete 2 And increases the corrosion resistance of the concrete.

Description

High-strength corrosion-resistant concrete and preparation method thereof
Technical Field
The invention belongs to the technical field of concrete, and particularly relates to high-strength corrosion-resistant concrete and a preparation method thereof.
Background
With the continuous improvement of the modernization level, higher requirements such as high-rise and large-span are put on modern buildings, and in order to achieve the requirements, the specific strength of the cement-based composite material needs to be further improved. Compounding is an important way for cement-based materials to achieve high performance, with fiber reinforcement being the core. Therefore, the research of the fiber reinforced cement composite material is greatly broken through at home and abroad.
In the prior art, although the concrete has very abundant raw materials, the raw materials of cement, sand, stone, water and other materials, the concrete is very common in nature, the concrete is very abundant, local materials can be obtained, and the cost is low; however, concrete has low tensile strength and is easily corroded by the environment, and one of the main reasons for concrete corrosion is carbonization, which is penetration of carbon dioxide (CO 2) in the atmosphere through the concrete, causing corrosion of the concrete and alkali-aggregate reaction, rusting the steel bar, and reducing the durability of the concrete.
Disclosure of Invention
The invention aims to provide high-strength corrosion-resistant concrete and a preparation method thereof, wherein the fly ash is subjected to surface hydroxylation to increase the dispersibility of the fly ash in the concrete, and carbon fibers and aminated TiO are used for preparing the concrete 2 The composite addition not only increases the strength of the concrete, but also ensures that CO is captured in the concrete 2 Carbon fiber-TiO 2 Hydroxyl groups on the surface of the carbon fiber in the composite material can also interact with hydroxyl groups between the hydroxylated fly ash, so that the fly ash and the carbon fiber are realizedvitamin-TiO 2 Synchronous dispersion of the composite material.
The invention aims to solve the technical problems: concrete has low tensile strength and is easy to erode by environment, and the main reason of concrete erosion is carbonization, which is carbon dioxide (CO) in the atmosphere 2 ) Penetration of concrete causes corrosion of the concrete and alkali-aggregate reaction, which causes corrosion of the steel reinforcement.
The aim of the invention can be achieved by the following technical scheme:
the high-strength corrosion-resistant concrete comprises the following raw materials in parts by mass: 300-350 parts of cement, 150-170 parts of water, 750-800 parts of sand, 1200-1300 parts of stone, 3-4 parts of additive and carbon fiber-TiO 2 10-20 parts of composite material and 30-40 parts of modified fly ash;
the carbon fiber-TiO 2 The composite material is prepared by the following steps:
s1, mixing carbon fibers with an HCl solution with the concentration of 0.9M, filtering, washing and drying at the temperature of 60 ℃ to obtain pretreated carbon fibers, wherein the dosage ratio of the carbon fibers to the HCl solution is 4-6g:150-200mL;
in the reaction process, a large amount of hydroxyl groups are grafted on the surface of the fly ash.
S2, firstly adding tetraethylenepentamine into ethanol and water, mixing for 0.5h, and then adding TiO 2 Transferring the nano particles into an autoclave, keeping the temperature at 80 ℃ for 6 hours, naturally cooling to room temperature, adding pretreated carbon fibers, uniformly mixing, centrifuging, washing and annealing at 100 ℃ to obtain carbon fiber-TiO 2 Composite material, wherein tetraethylenepentamine, ethanol, water, tiO 2 The dosage ratio of the nano particles to the pretreated carbon fiber is 8-12mL:45-55mL:45-55mL:2-4g:4-6g.
In the reaction process, tiO is treated under high pressure 2 The nano particles are immersed in tetraethylenepentamine solution, so that the tetraethylenepentamine molecules are in TiO 2 Adsorption on nanoparticles, and thus TiO 2 The surfaces of the nano particles are rich in amino functional groups, and the amino functional groups interact with hydroxyl groups on the carbon fibers, so that TiO (titanium dioxide) is realized 2 Nanoparticle in carbon fiberAdsorption on the dimension.
Further, the modified fly ash is prepared by the following steps:
grinding the fly ash particles in a ball mill for 48 hours to obtain fly ash powder, mixing and stirring 5g of fly ash powder with 200mL of 0.9M HCl solution, filtering to obtain solid, washing the solid with water, and drying at 60 ℃ to obtain the modified fly ash.
Further, the additive is a polycarboxylate water reducer.
A preparation method of high-strength corrosion-resistant concrete comprises the following steps:
b1, carbon fiber-TiO 2 The composite material and the modified fly ash are fully mixed and then added into cement to be uniformly mixed;
and B2, sequentially adding the sand, the stones and the mixture obtained in the step B1 into a stirrer for dry mixing, adding the additive into water for uniform mixing, and adding the mixture into the stirrer for stirring, so as to obtain the product.
Further, in step B1, carbon fiber-TiO 2 The mixing time of the composite material and the modified fly ash is 5-10min.
Further, the sand, the cobble and the mixture obtained in the step B1 are sequentially added into a stirrer for dry stirring for 1-2min, and then added into the stirrer for stirring for 3-4min.
The invention has the beneficial effects that:
(1) In the technical scheme of the invention, tiO is prepared by 2 Nanoparticles on carbon fiber such that carbon fiber-TiO 2 The composite material can be better dispersed in concrete, carbon fiber and TiO 2 The nano particles can enhance the mechanical property and tensile property of concrete, and TiO 2 The surface of the nanoparticle has the function of capturing CO due to the compound amino function group 2 The molecular capacity, the main reaction process is:
Figure BDA0003737895180000031
thereby realizing CO 2 Ammonium carbonate is produced.
(2) In the technical scheme of the invention, the modified fly ash is added, so that the modified fly ash can be uniformly dispersed in concrete, can play an active role in the concrete, can enable gaps between cement and sand to be smaller, and can further cooperate with carbon fiber-TiO 2 The composite material serves to reduce CO 2 Corrosion effects.
Detailed Description
The technical solutions of the embodiments of the present invention will be clearly and completely described below in conjunction with the embodiments of the present invention, and it is apparent that the described embodiments are only some embodiments of the present invention, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Example 1
Carbon fiber-TiO 2 The composite material is prepared by the following steps:
s1, mixing 4g of carbon fiber with 150mL of 0.9M HCl solution, filtering, washing and drying at 60 ℃ to obtain pretreated carbon fiber;
s2, firstly adding 8mL of tetraethylenepentamine into 45mL of ethanol and 45mL of water, mixing for 0.5h, and then adding 2g of TiO 2 Transferring the nano particles into an autoclave, keeping the temperature at 80 ℃ for 6 hours, naturally cooling to room temperature, adding 4g of pretreated carbon fiber, uniformly mixing, centrifuging, washing and annealing at 100 ℃ to obtain the carbon fiber-TiO 2 A composite material.
Example 2
Carbon fiber-TiO 2 The composite material is prepared by the following steps:
s1, mixing 5g of carbon fiber with 180mL of 0.9M HCl solution, filtering, washing and drying at 60 ℃ to obtain pretreated carbon fiber;
s2, firstly adding 10mL of tetraethylenepentamine into 50mL of ethanol and 50mL of water, mixing for 0.5h, and then adding 3g of TiO 2 The nanoparticles were transferred to an autoclave and kept at 80℃for 6 hours, then naturally cooled to room temperature, and 5g were addedPretreating carbon fiber, mixing uniformly, centrifuging, washing, and annealing at 100deg.C to obtain carbon fiber-TiO 2 A composite material.
Example 3
Carbon fiber-TiO 2 The composite material is prepared by the following steps:
s1, mixing 6g of carbon fiber with 200mL of 0.9M HCl solution, filtering, washing and drying at 60 ℃ to obtain pretreated carbon fiber;
s2, adding 12mL of tetraethylenepentamine into 55mL of ethanol and 55mL of water, mixing for 0.5h, and then adding 4g of TiO 2 Transferring the nano particles into an autoclave, keeping the temperature at 80 ℃ for 6 hours, naturally cooling to room temperature, adding 6g of pretreated carbon fiber, uniformly mixing, centrifuging, washing and annealing at 100 ℃ to obtain the carbon fiber-TiO 2 A composite material.
Comparative example 1
This comparative example is the product obtained in step S1 of example 3.
Example 4
The high-strength corrosion-resistant concrete comprises the following raw materials in parts by mass: 300 parts of cement, 150 parts of water, 750 parts of sand, 1200 parts of stone, 3 parts of additive and the carbon fiber-TiO prepared in example 1 2 10 parts of composite material and 30 parts of modified fly ash;
wherein the cement is superfine grouting cement, the variety code is PSG.G, the broken stone is continuous graded broken stone of 9.5mm-19.0mm, and the sand is continuous graded sand of 0.15mm-2.36 mm;
the method comprises the following steps:
b1, weighing raw materials in parts by mass of the formula, and mixing the carbon fiber with TiO 2 Mixing the composite material and the modified fly ash for 5min, and then adding the mixture into cement to be uniformly mixed;
and B2, sequentially adding the sand, the stones and the mixture obtained in the step B1 into a stirrer for dry mixing for 1min, adding the additive into water for uniform mixing, adding the mixture into the stirrer for stirring for 3min, and uniformly mixing to obtain the product.
Example 5
A high-strength corrosion-resistant concrete comprisesThe following raw materials in parts by mass: 330 parts of cement, 160 parts of water, 770 parts of sand, 1250 parts of stone, 3.5 parts of additive and the carbon fiber-TiO prepared in example 2 2 15 parts of composite material and 35 parts of modified fly ash;
wherein the cement is superfine grouting cement, the variety code is PSG.G, the broken stone is continuous graded broken stone of 9.5mm-19.0mm, and the sand is continuous graded sand of 0.15mm-2.36 mm;
the method comprises the following steps:
b1, weighing raw materials in parts by mass of the formula, and mixing the carbon fiber with TiO 2 Mixing the composite material and the modified fly ash for 8min, and then adding the mixture into cement to be uniformly mixed;
and B2, sequentially adding the sand, the stones and the mixture obtained in the step B1 into a stirrer for dry mixing for 1.5min, adding the additive into water for uniform mixing, adding the mixture into the stirrer for stirring for 3.5min, and uniformly mixing to obtain the product.
Example 6
The high-strength corrosion-resistant concrete comprises the following raw materials in parts by mass: 350 parts of cement, 170 parts of water, 800 parts of sand, 1300 parts of stone, 4 parts of additive and carbon fiber-TiO prepared in example 3 2 20 parts of composite material and 40 parts of modified fly ash;
wherein the cement is superfine grouting cement, the variety code is PSG.G, the broken stone is continuous graded broken stone of 9.5mm-19.0mm, and the sand is continuous graded sand of 0.15mm-2.36 mm;
the method comprises the following steps:
b1, weighing raw materials in parts by mass of the formula, and mixing the carbon fiber with TiO 2 Mixing the composite material and the modified fly ash for 10min, and then adding the mixture into cement to be uniformly mixed;
and B2, sequentially adding the sand, the stones and the mixture obtained in the step B1 into a stirrer for dry mixing for 2min, adding the additive into water for uniform mixing, adding the mixture into the stirrer for stirring for 4min, and uniformly mixing to obtain the product.
Comparative example 2
This comparative example differs from example 6 in that the carbon fiber-TiO prepared in example 3 2 The composite material was replaced with the material prepared in comparative example 1, other steps and originalThe material was the same as in example 6.
Comparative example 3
This comparative example differs from example 6 in that the carbon fiber-TiO prepared in example 3 is not added 2 The composite replacement, other steps and raw materials were the same as in example 6.
The concrete prepared in examples 4 to 6 and comparative example 2 was now subjected to performance test according to GB/T50081-2002 Standard test method for mechanical Properties of ordinary concrete, and the test results are shown in Table 1 below.
TABLE 1
Project 28d compressive Strength/MPa 28d split tensile Strength/MPa Slump/mm Workability of
Example 4 62.67 4.4 182 Excellent in
Example 5 62.86 4.8 187 Excellent in
Example 6 62.56 4.6 186 Excellent in
Comparative example 2 52.56 3.3 131 In general
Comparative example 3 50.49 2.4 105 In general
As is clear from Table 1 above, the concrete prepared in the examples of the present invention has better mechanical properties, slump and workability than those of the comparative examples.
In the description of the present specification, the descriptions of the terms "one embodiment," "example," "specific example," and the like, mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present invention. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiments or examples. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
The foregoing is merely illustrative and explanatory of the invention, as various modifications and additions may be made to the particular embodiments described, or in a similar manner, by those skilled in the art, without departing from the scope of the invention or exceeding the scope of the invention as defined in the claims.

Claims (6)

1. A high-strength corrosion-resistant concrete is characterized in that: comprises the following raw materials in parts by mass: 300-350 parts of cement, 150-170 parts of water, 750-800 parts of sand, 1200-1300 parts of stone, 3-4 parts of additive, 10-20 parts of carbon fiber-TiO 2 composite material and 30-40 parts of modified fly ash;
the carbon fiber-TiO 2 The composite material is prepared by the following steps:
s1, mixing carbon fibers with an HCl solution with the concentration of 0.9M, filtering, washing and drying at 60 ℃ to obtain pretreated carbon fibers;
s2, firstly adding tetraethylenepentamine into ethanol and water, mixing for 0.5h, and then adding TiO 2 Transferring the nano particles into an autoclave, keeping the temperature at 80 ℃ for 6 hours, naturally cooling to room temperature, adding pretreated carbon fibers, uniformly mixing, centrifuging, washing and annealing at 100 ℃ to obtain carbon fiber-TiO 2 A composite material;
the modified fly ash is prepared by the following steps:
grinding the fly ash particles in a ball mill for 48 hours to obtain fly ash powder, mixing and stirring the fly ash powder and an HCl solution with the concentration of 0.9M, filtering to obtain a solid, washing the solid with water, and drying at the temperature of 60 ℃ to obtain the modified fly ash.
2. A high strength, corrosion resistant concrete according to claim 1, wherein: in the step S1, the dosage ratio of the carbon fiber to the HCl solution is 4-6g:150-200mL.
3. A high strength, corrosion resistant concrete according to claim 1, wherein: in step S2, tetraethylenepentamine, ethanol, water and TiO 2 The dosage ratio of the nano particles to the pretreated carbon fiber is 8-12mL:45-55mL:45-55mL:2-4g:4-6g.
4. A high strength, corrosion resistant concrete according to claim 1, wherein: the additive is a polycarboxylate water reducer.
5. A method for preparing high strength, corrosion resistant concrete according to any one of claims 1 to 4, wherein: the method comprises the following steps:
b1, weighing raw materials in parts by mass of the formula, and mixing the carbon fiber with TiO 2 The composite material and the modified fly ash are fully mixed and then added into cement to be uniformly mixed;
and B2, sequentially adding the sand, the stones and the mixture obtained in the step B1 into a stirrer for dry mixing, adding the additive into water for uniform mixing, and adding the mixture into the stirrer for stirring, so as to obtain the product.
6. The method for preparing high-strength corrosion-resistant concrete according to claim 5, wherein: in the step B2, the sand, the stones and the mixture obtained in the step B1 are sequentially added into a stirrer for dry stirring for 1-2min, and then added into the stirrer for stirring for 3-4min.
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