CN112110684A - Large-mixing-amount fly ash concrete and preparation method thereof - Google Patents

Large-mixing-amount fly ash concrete and preparation method thereof Download PDF

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CN112110684A
CN112110684A CN202010908546.2A CN202010908546A CN112110684A CN 112110684 A CN112110684 A CN 112110684A CN 202010908546 A CN202010908546 A CN 202010908546A CN 112110684 A CN112110684 A CN 112110684A
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fly ash
parts
concrete
water
sodium
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李亚林
刘雄飞
李鑫磊
盛夏斌
陈前
李翔
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Wuhan Xinyunhai Concrete Co ltd
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Wuhan Xinyunhai Concrete Co ltd
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    • 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
    • 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
    • C04B14/04Silica-rich materials; Silicates
    • C04B14/06Quartz; Sand
    • 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
    • C04B18/06Combustion residues, e.g. purification products of smoke, fumes or exhaust gases
    • C04B18/08Flue dust, i.e. fly ash
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    • 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
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    • C04B18/12Waste materials; Refuse from quarries, mining or the like
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    • 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
    • C04B22/00Use of inorganic materials as active ingredients for mortars, concrete or artificial stone, e.g. accelerators, shrinkage compensating agents
    • C04B22/08Acids or salts thereof
    • C04B22/14Acids or salts thereof containing sulfur in the anion, e.g. sulfides
    • C04B22/142Sulfates
    • C04B22/147Alkali-metal sulfates; Ammonium sulfate
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    • 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
    • C04B24/12Nitrogen containing compounds organic derivatives of hydrazine
    • C04B24/122Hydroxy amines
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    • 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
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    • C04B24/16Sulfur-containing compounds
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    • 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
    • C04B24/24Macromolecular compounds
    • C04B24/26Macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds
    • C04B24/2641Polyacrylates; Polymethacrylates
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    • 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
    • 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

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Abstract

The application relates to a high-volume fly ash concrete and a preparation method thereof, relating to the field of green building materials, wherein the high-volume fly ash concrete comprises the following components in parts by weight: 1100 parts of coarse aggregate, 800 parts of fine aggregate, 180 parts of cement, 160 parts of fly ash, 4-6 parts of water reducing agent, 0.3-0.6 part of exciting agent and 180 parts of water, wherein the exciting agent is a mixture of sodium sulfate, alpha-sodium alkenyl sulfonate, sodium polyacrylate and triethanolamine. The preparation method of the large-doped fly ash concrete comprises the following steps: s1, dry material premixing and S2, water agent adding. The method has the effect of improving the problem that the concrete strength and the construction performance are reduced due to the increase of the mixing amount of the fly ash.

Description

Large-mixing-amount fly ash concrete and preparation method thereof
Technical Field
The application relates to the field of green building materials, in particular to a large-volume fly ash concrete and a preparation method thereof.
Background
The fly ash is one of industrial waste residues with large discharge capacity in China at present and is also an important admixture for concrete. The fly ash has a morphological effect, namely the fly ash contains more than 70 percent of glass beads, and has complete particle shape, smooth surface and compact texture. The form can undoubtedly play a role in reducing water, compacting and homogenizing, change the rheological property and the initial structure of the mixture and play a role in well lubricating the pumped concrete. In addition, the fly ash also has an active effect, the micro-beads and detritus with small grain size in the fly ash can be equivalent to unhydrated cement grains in a set cement, and the ultra-fine micro-beads are equivalent to active nano materials, so that the structural strength of concrete and products thereof can be obviously improved and enhanced, and the homogeneity and the compactness are improved.
At present, the mixing amount of fly ash in concrete is generally 10-15%, when the mixing amount of fly ash is too large, fly ash particles float upwards easily to generate bleeding, the early strength of concrete is greatly reduced, and when the mixing amount is too large, the problems of slow coagulation and the like can be caused. Therefore, how to increase the blending amount of the fly ash to reduce the cost and ensure the strength and the construction performance of the concrete is a difficult problem to be solved urgently.
Disclosure of Invention
In order to solve the problem that the concrete strength and the construction performance are reduced due to the increase of the fly ash content, the application provides the fly ash concrete with the large content and the preparation method thereof.
The application provides a large-volume fly ash concrete which adopts the following technical scheme:
the high-volume fly ash concrete comprises the following components in parts by weight: 1100 parts of coarse aggregate, 800 parts of fine aggregate, 180 parts of cement, 160 parts of fly ash, 4-6 parts of water reducing agent, 0.3-0.6 part of exciting agent and 180 parts of water, wherein the exciting agent is a mixture of sodium sulfate, alpha-sodium alkenyl sulfonate, sodium polyacrylate and triethanolamine.
By adopting the technical scheme, the mixing amount of the fly ash in the concrete reaches more than 50 percent, the material cost can be greatly reduced, and the environment-friendly concept of waste residue resource recycling is better met. The sodium sulfate in the activator can promote early cement hydration, avoid overlong concrete setting time and overlow early strength, and can excite the activity of the fly ash in the middle and later periods, and avoid the situation that the later strength is always in a very low state, thereby ensuring that the concrete still has good structural strength under the conditions of low cement and large amount of fly ash. The alpha-sodium alkenyl sulfonate plays a role in improving the fluidity and maintaining the fluidity, and the alpha-sodium alkenyl sulfonate also plays a role in improving the durability, permeability resistance and scouring resistance in the later period. The sodium polyacrylate is beneficial to keeping the stability of the concrete, so that the concrete does not bleed and is not isolated. The main function of triethanolamine is to promote early hydration and improve early strength.
The performance of the concrete with the large amount of fly ash is reinforced in all aspects by the excitant, so that the production cost is greatly reduced, the environment is protected, and the construction performance and the service performance of the concrete are guaranteed.
Preferably, the concrete comprises the following components in parts by weight: 1040-1060 parts of coarse aggregate, 790 parts of fine aggregate, 215 parts of cement 205-155 parts of fly ash 145-155 parts of water reducing agent, 4.2-5.6 parts of exciting agent, 0.45-0.55 part of water 155-170 parts of sodium sulfate, alpha-sodium alkenyl sulfonate, sodium polyacrylate and triethanolamine.
By adopting the technical scheme, experimental data show that when the raw materials are proportioned, the concrete has more excellent construction performance and comprehensive use performance.
Preferably, the mass ratio of the sodium sulfate, the alpha-sodium alkenyl sulfonate, the sodium polyacrylate and the triethanolamine in the excitant is (3-5): (1-1.5): (2-3): (3-4).
By adopting the technical scheme, experimental data show that when the components in the exciting agent are proportioned, the performance enhancing effect on concrete is more obvious, and the comprehensive performance of the concrete is more excellent.
Preferably, the fly ash is activated fly ash, and the activated fly ash is prepared by the following steps:
a. pretreating fly ash: spraying water into the fly ash under the condition of continuously stirring, and standing for 20-30 min;
b. calcining the fly ash: calcining the fly ash obtained in the step a at the temperature of 500-;
c. activation of fly ash: and c, spraying ethanol into the fly ash obtained in the step b under the conditions of continuous stirring and 40-45 ℃, then carrying out ball milling treatment at 80-85 ℃, and standing for 5-10min to obtain the activated fly ash.
By adopting the technical scheme, water is sprayed into the fly ash and stands, the water is uniformly adsorbed in pores inside the fly ash, then a large amount of hydroxyl groups can be introduced into the pores of the fly ash through heating and calcining treatment, the hydroxyl groups are uniformly distributed in the fly ash, and the bonding strength between raw materials is enhanced, so that the early strength of concrete is improved, and the construction time is shortened. Meanwhile, the coal ash is ball-milled, and ethanol is added, so that the ball-milling efficiency of the coal ash can be improved, and the ethanol volatilizes in the ball-milling process to form a protective layer on the surface of the coal ash, so that the coal ash is protected. The fly ash treated by the steps a, b and c has higher reactivity and stability.
Preferably, in the step a of preparing the activated fly ash, the mass ratio of the sprayed water to the fly ash is 0.25: 1.
By adopting the technical scheme, the experimental data show that when the mass ratio of the sprayed water to the fly ash is 0.25:1, the activity of the fly ash is improved more remarkably, and the improvement is mainly reflected in the influence of the fly ash on the early strength performance of concrete.
Preferably, in the step b of preparing the activated fly ash, the calcination time of the fly ash is 0.5-1.0 h; and c, ball milling the coal ash for 15-20 min.
By adopting the technical scheme, experimental data show that the fly ash can be activated more thoroughly by adopting the calcination time and the ball milling time of the fly ash, and the influence of the fly ash on the early strength performance of concrete is mainly reflected.
Preferably, the coarse aggregate is continuous graded broken stone with the particle size of 10mm-35mm, and the crushing value is 6.5-9.8%.
By adopting the technical scheme, the experimental data show that when the coarse aggregate adopts 10-35mm connecting graded broken stones and the crushing value is 6.5-9.8%, the later-period compressive strength of the concrete is higher.
Preferably, the fine aggregate is machine-made sand with fineness modulus of 2.5-3.5.
By adopting the technical scheme, experimental data show that when the fine aggregate adopts the machine-made sand with the fineness modulus of 2.5-3.5, the early strength, the later strength and the impermeability of the concrete are all more excellent, which indicates that good gradation is formed between the fine aggregate and the coarse aggregate, and the concrete has fewer internal structural defects and is more compact.
Preferably, the water reducing agent is a polycarboxylic acid water reducing agent.
The preparation method of the large-volume fly ash concrete adopts the following technical scheme:
a preparation method of a large-volume fly ash concrete comprises the following steps:
s1, dry material premixing: weighing the raw materials according to the proportion, mixing the coarse aggregate, the fine aggregate, the cement and the fly ash, and uniformly stirring and dispersing to form a premixed dry material;
s2, adding a water agent: and (3) uniformly mixing the excitant and water to form a mixed solution, adding a water reducing agent into the premixed dry material obtained in the step S1, uniformly dispersing, then adding the mixed solution, and uniformly stirring to obtain the mixed concrete.
By adopting the technical scheme, the coarse aggregate, the fine aggregate, the cement and the fly ash dry materials are mixed firstly, so that the dry materials are uniformly mixed and dispersed, and the problem of nonuniform dispersion caused by agglomeration of the cement and the fly ash after the introduction of the water aqua is avoided. In the water agent, water and the excitant are mixed to form a mixed solution, so that all components in the excitant can be uniformly dispersed in the dry material along with the water, and the water agent can better cooperate with the fly ash to play a role.
In summary, the present application includes at least one of the following beneficial technical effects:
1. the mixing amount of the fly ash in the concrete reaches more than 50 percent, so that the material cost can be greatly reduced, and the environment-friendly concept of waste residue resource recycling is better met; meanwhile, the concrete is added with the excitant to reinforce the large-dosage fly ash concrete, so that the manufacturing cost of the concrete is reduced, and the corresponding construction performance and use performance can be ensured;
2. the fly ash is subjected to activation treatment, and after the processes of water spraying, heating calcination, ball milling and the like, a large amount of hydroxyl groups are introduced into the fly ash and have high stability, and the hydroxyl groups are uniformly distributed in the fly ash to enhance the bonding strength between raw materials, so that the early strength of concrete is improved, and the construction time is shortened;
3. coarse aggregate and fine aggregate with proper particle size are adopted for grading, so that the internal structure defects of the concrete are fewer, the concrete is more compact, and the comprehensive performance is more excellent.
Detailed Description
The present application will be described in further detail with reference to specific examples.
Preparation example 1:
an activated fly ash prepared by the steps of:
a. pretreating fly ash: spraying water into the fly ash under the condition of continuous stirring, wherein the mass ratio of the water to the fly ash is 0.25:1, and standing for 20 min;
b. calcining the fly ash: calcining the fly ash obtained in the step a for 0.5h at 500 ℃ in an inert gas atmosphere, and then cooling to room temperature;
c. activation of fly ash: and c, spraying ethanol into the fly ash obtained in the step b under the conditions of continuous stirring and 40 ℃, then carrying out ball milling treatment for 15min under the condition of 80 ℃, and standing for 5min to obtain the activated fly ash.
Preparation example 2:
an activated fly ash prepared by the steps of:
a. pretreating fly ash: spraying water into the fly ash under the condition of continuous stirring, wherein the mass ratio of the water to the fly ash is 0.25:1, and standing for 25 min;
b. calcining the fly ash: calcining the fly ash obtained in the step a at 530 ℃ in an inert gas atmosphere for 0.8h, and then cooling to room temperature;
c. activation of fly ash: and c, spraying ethanol into the fly ash obtained in the step b under the conditions of continuous stirring and 42 ℃, then carrying out ball milling treatment for 18min under the condition of 83 ℃, and standing for 8min to obtain the activated fly ash.
Preparation example 3:
an activated fly ash prepared by the steps of:
a. pretreating fly ash: spraying water into the fly ash under the condition of continuous stirring, wherein the mass ratio of the water to the fly ash is 0.25:1, and standing for 30 min;
b. calcining the fly ash: calcining the fly ash obtained in the step a for 1h at 550 ℃ in an inert gas atmosphere, and then cooling to room temperature;
c. activation of fly ash: and c, spraying ethanol into the fly ash obtained in the step b under the conditions of continuous stirring and 45 ℃, then carrying out ball milling treatment for 20min under the condition of 85 ℃, and standing for 10min to obtain the activated fly ash.
Example 1:
the components of the high-volume fly ash concrete are shown in the table 1.
Table 1 examples 1-6 component content table.
Figure BDA0002660559460000051
Wherein the coarse aggregate is crushed stone with the particle size of 40-60mm, and the crushing value is 12.6%.
The fine aggregate is machine-made sand with fineness modulus of 5.2.
The water reducing agent is a polycarboxylic acid water reducing agent.
The excitant is a mixture of sodium sulfate, alpha-alkenyl sodium sulfonate, sodium polyacrylate and triethanolamine in a proper mass ratio of 1:1:1: 1.
The embodiment also provides a preparation method of the high-volume fly ash concrete, which comprises the following steps:
s1, dry material premixing: weighing the raw materials according to the proportion, mixing the coarse aggregate, the fine aggregate, the cement and the fly ash, and uniformly stirring and dispersing to form a premixed dry material;
s2, adding a water agent: and (3) uniformly mixing the excitant and water to form a mixed solution, adding a water reducing agent into the premixed dry material obtained in the step S1, uniformly dispersing, then adding the mixed solution, and uniformly stirring to obtain the mixed concrete.
Example 2:
the components of the high-volume fly ash concrete are shown in the table 1.
Wherein the coarse aggregate is continuous graded broken stone with the particle size of 5-10mm, and the crushing value is 3.5%.
The fine aggregate is machine-made sand with fineness modulus of 1.8.
The water reducing agent is a polycarboxylic acid water reducing agent.
The excitant is a mixture of sodium sulfate, alpha-alkenyl sodium sulfonate, sodium polyacrylate and triethanolamine in a proper mass ratio of 1:1:1: 1.
The embodiment also provides a preparation method of the high-volume fly ash concrete, which comprises the following steps:
s1, dry material premixing: weighing the raw materials according to the proportion, mixing the coarse aggregate, the fine aggregate, the cement and the fly ash, and uniformly stirring and dispersing to form a premixed dry material;
s2, adding a water agent: and (3) uniformly mixing the excitant and water to form a mixed solution, adding a water reducing agent into the premixed dry material obtained in the step S1, uniformly dispersing, then adding the mixed solution, and uniformly stirring to obtain the mixed concrete.
Example 3:
the components of the high-volume fly ash concrete are shown in the table 1.
Wherein the coarse aggregate is continuous graded broken stone with the grain diameter of 10-35mm, and the crushing value is 6.8%.
The fine aggregate is machine-made sand with fineness modulus of 2.8.
The activated fly ash in preparation example 1 was selected as the fly ash.
The water reducing agent is a polycarboxylic acid water reducing agent.
The excitant is a mixture of sodium sulfate, alpha-sodium alkenyl sulfonate, sodium polyacrylate and triethanolamine in a proper mass ratio of 3:1:2: 3.
The embodiment also provides a preparation method of the high-volume fly ash concrete, which comprises the following steps:
s1, dry material premixing: weighing the raw materials according to the proportion, mixing the coarse aggregate, the fine aggregate, the cement and the fly ash, and uniformly stirring and dispersing to form a premixed dry material;
s2, adding a water agent: and (3) uniformly mixing the excitant and water to form a mixed solution, adding a water reducing agent into the premixed dry material obtained in the step S1, uniformly dispersing, then adding the mixed solution, and uniformly stirring to obtain the mixed concrete.
Example 4:
the components of the high-volume fly ash concrete are shown in the table 1.
Wherein the coarse aggregate is continuous graded broken stone with the grain diameter of 10-35mm, and the crushing value is 7.5%.
The fine aggregate is machine-made sand with fineness modulus of 3.2.
The activated fly ash in preparation example 2 was selected as the fly ash.
The water reducing agent is a polycarboxylic acid water reducing agent.
The excitant is a mixture of sodium sulfate, alpha-alkenyl sodium sulfonate, sodium polyacrylate and triethanolamine with the proper mass ratio of 4:1.25:2.5: 3.5.
The embodiment also provides a preparation method of the high-volume fly ash concrete, which comprises the following steps:
s1, dry material premixing: weighing the raw materials according to the proportion, mixing the coarse aggregate, the fine aggregate, the cement and the fly ash, and uniformly stirring and dispersing to form a premixed dry material;
s2, adding a water agent: and (3) uniformly mixing the excitant and water to form a mixed solution, adding a water reducing agent into the premixed dry material obtained in the step S1, uniformly dispersing, then adding the mixed solution, and uniformly stirring to obtain the mixed concrete.
Example 5:
the components of the high-volume fly ash concrete are shown in the table 1.
Wherein the coarse aggregate is continuous graded broken stone with the grain diameter of 10-35mm, and the crushing value is 8.8%.
The fine aggregate is machine-made sand with fineness modulus of 3.5.
The activated fly ash in preparation example 3 was selected as the fly ash.
The water reducing agent is a polycarboxylic acid water reducing agent.
The excitant is a mixture of sodium sulfate, alpha-alkenyl sodium sulfonate, sodium polyacrylate and triethanolamine with the proper mass ratio of 4.5:1.25:3: 3.
The embodiment also provides a preparation method of the high-volume fly ash concrete, which comprises the following steps:
s1, dry material premixing: weighing the raw materials according to the proportion, mixing the coarse aggregate, the fine aggregate, the cement and the fly ash, and uniformly stirring and dispersing to form a premixed dry material;
s2, adding a water agent: and (3) uniformly mixing the excitant and water to form a mixed solution, adding a water reducing agent into the premixed dry material obtained in the step S1, uniformly dispersing, then adding the mixed solution, and uniformly stirring to obtain the mixed concrete.
Example 6:
the components of the high-volume fly ash concrete are shown in the table 1.
Wherein the coarse aggregate is continuous graded broken stone with the grain diameter of 10-35mm, and the crushing value is 9.5%.
The fine aggregate is machine-made sand with fineness modulus of 3.2.
The activated fly ash in preparation example 3 was selected as the fly ash.
The water reducing agent is a polycarboxylic acid water reducing agent.
The excitant is a mixture of sodium sulfate, alpha-alkenyl sodium sulfonate, sodium polyacrylate and triethanolamine in a proper mass ratio of 5:1.5:3: 4.
The embodiment also provides a preparation method of the high-volume fly ash concrete, which comprises the following steps:
s1, dry material premixing: weighing the raw materials according to the proportion, mixing the coarse aggregate, the fine aggregate, the cement and the fly ash, and uniformly stirring and dispersing to form a premixed dry material;
s2, adding a water agent: and (3) uniformly mixing the excitant and water to form a mixed solution, adding a water reducing agent into the premixed dry material obtained in the step S1, uniformly dispersing, then adding the mixed solution, and uniformly stirring to obtain the mixed concrete.
Comparative example 1:
this comparative example differs from example 1 in that no activator is included.
And (3) performance detection:
and (3) testing the compressive strength:
the compressive strength of the concrete mixed in the examples 1-6 and the comparative example 1 is determined by referring to the standard GB/T50081-2002 of common concrete mechanical property test methods. Immediately covering the surface of a cubic concrete compressive strength test piece with a waterproof film after the test piece is formed, and removing the mold within 24 hours after mold maintenance is carried out in an environment with the temperature of 20 +/-5 ℃ until final setting is achieved. Immediately placing the mold into a standard curing room with the temperature of 20 +/-2 ℃ and the relative humidity of more than 95 percent for curing after removing the mold, and respectively measuring the compressive strength tests of 3d, 7d and 28 d. The test results are shown in table 2.
And (3) testing the impermeability:
the concrete samples obtained in examples 1 to 6 and comparative example 1 were subjected to a 28-day water penetration resistance test in accordance with "Standard test methods for Long-term Performance and durability of ordinary concrete" GB/T50082-2009. The test results are shown in table 2.
TABLE 2 tables of Performance test data for examples 1-6 and comparative example 1
Figure BDA0002660559460000081
The implementation principle of the embodiment of the application is as follows: the mixing amount of the fly ash in the concrete reaches more than 50 percent, so that the material cost can be greatly reduced, and the environment-friendly concept of waste residue resource recycling is better met; meanwhile, the concrete is added with the excitant to reinforce the large-dosage fly ash concrete, so that the manufacturing cost of the concrete is reduced, and the corresponding construction performance and use performance can be ensured.
The above embodiments are preferred embodiments of the present application, and the protection scope of the present application is not limited by the above embodiments, so: all equivalent changes made according to the structure, shape and principle of the present application shall be covered by the protection scope of the present application.

Claims (10)

1. The high-volume fly ash concrete is characterized by comprising the following components in parts by weight: 1100 parts of coarse aggregate, 800 parts of fine aggregate, 180 parts of cement, 160 parts of fly ash, 4-6 parts of water reducing agent, 0.3-0.6 part of exciting agent and 180 parts of water, wherein the exciting agent is a mixture of sodium sulfate, alpha-sodium alkenyl sulfonate, sodium polyacrylate and triethanolamine.
2. The high-volume fly ash concrete as claimed in claim 1, which comprises the following components in parts by weight: 1040-1060 parts of coarse aggregate, 790 parts of fine aggregate, 215 parts of cement 205-155 parts of fly ash 145-155 parts of water reducing agent, 4.2-5.6 parts of exciting agent, 0.45-0.55 part of water 155-170 parts of sodium sulfate, alpha-sodium alkenyl sulfonate, sodium polyacrylate and triethanolamine.
3. The high-volume fly ash concrete as claimed in claim 2, wherein: the mass ratio of sodium sulfate, alpha-sodium olefin sulfonate, sodium polyacrylate and triethanolamine in the excitant is (3-5): (1-1.5): (2-3): (3-4).
4. The heavily-doped fly ash concrete as claimed in claim 3, wherein: the fly ash is activated fly ash, and the activated fly ash is prepared by the following steps:
a. pretreating fly ash: spraying water into the fly ash under the condition of continuously stirring, and standing for 20-30 min;
b. calcining the fly ash: calcining the fly ash obtained in the step a at the temperature of 500-;
c. activation of fly ash: and c, spraying ethanol into the fly ash obtained in the step b under the conditions of continuous stirring and 40-45 ℃, then carrying out ball milling treatment at 80-85 ℃, and standing for 5-10min to obtain the activated fly ash.
5. The heavily-doped fly ash concrete as claimed in claim 4, wherein: in the step a of preparing the activated fly ash, the mass ratio of the sprayed water to the fly ash is 0.25: 1.
6. The heavily-doped fly ash concrete as claimed in claim 5, wherein: in the step b of preparing the activated fly ash, the calcination time of the fly ash is 0.5-1.0 h; and c, ball milling the coal ash for 15-20 min.
7. The high-volume fly ash concrete as claimed in claim 1, wherein: the coarse aggregate is continuous graded broken stone with the grain diameter of 10mm-35mm, and the crushing value is 6.5-9.8%.
8. The high-volume fly ash concrete as claimed in claim 1, wherein: the fine aggregate is machine-made sand with fineness modulus of 2.5-3.5.
9. The high-volume fly ash concrete as claimed in claim 1, wherein: the water reducing agent is a polycarboxylic acid water reducing agent.
10. The method for preparing the heavily-doped fly ash concrete as claimed in any one of claims 1 to 9, which is characterized by comprising the following steps of:
s1, dry material premixing: weighing the raw materials according to the proportion, mixing the coarse aggregate, the fine aggregate, the cement and the fly ash, and uniformly stirring and dispersing to form a premixed dry material;
s2, adding a water agent: and (3) uniformly mixing the excitant and water to form a mixed solution, adding a water reducing agent into the premixed dry material obtained in the step S1, uniformly dispersing, then adding the mixed solution, and uniformly stirring to obtain the mixed concrete.
CN202010908546.2A 2020-09-01 2020-09-01 Large-mixing-amount fly ash concrete and preparation method thereof Pending CN112110684A (en)

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