CN112960924A - High-chlorine fly ash cementing material and preparation method thereof - Google Patents
High-chlorine fly ash cementing material and preparation method thereof Download PDFInfo
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- CN112960924A CN112960924A CN202110108707.4A CN202110108707A CN112960924A CN 112960924 A CN112960924 A CN 112960924A CN 202110108707 A CN202110108707 A CN 202110108707A CN 112960924 A CN112960924 A CN 112960924A
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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
- C04B7/00—Hydraulic cements
- C04B7/24—Cements from oil shales, residues or waste other than slag
- C04B7/243—Mixtures thereof with activators or composition-correcting additives, e.g. mixtures of fly ash and alkali activators
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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
- C04B7/00—Hydraulic cements
- C04B7/14—Cements containing slag
- C04B7/147—Metallurgical slag
- C04B7/153—Mixtures thereof with other inorganic cementitious materials or other activators
- C04B7/1535—Mixtures thereof with other inorganic cementitious materials or other activators with alkali metal containing activators, e.g. sodium hydroxide or waterglass
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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
- C04B7/00—Hydraulic cements
- C04B7/36—Manufacture of hydraulic cements in general
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- 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
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P40/00—Technologies relating to the processing of minerals
- Y02P40/10—Production of cement, e.g. improving or optimising the production methods; Cement grinding
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- Materials Engineering (AREA)
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- Inorganic Chemistry (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
- Processing Of Solid Wastes (AREA)
Abstract
The invention discloses a high-chlorine fly ash cementing material and a preparation method and application thereof. The preparation method of the high-chlorine fly ash cementing material comprises the following steps: (1) respectively ball-milling the high-chlorine fly ash, the slag and the mineral micro powder for 4-8 h; (2) uniformly mixing the high-chlorine fly ash, the slag and the mineral micro powder after ball milling; (3) and (3) adding an early strength agent and an alkali activator into the mixture obtained in the step (2) and uniformly mixing to obtain the high-chlorine fly ash cementing material. The invention excites the potential volcanic ash activity of the high-chlorine fly ash through a composite activation process, namely a physical and chemical activation method, thereby achieving the best effect of curing chloride ions. The raw material components in the cementing material are mutually cooperated and excited to form rich hydration products Friedel salt, AFt crystal and C-S-H gel, so that the chemical binding capacity of minerals and chloride ions in the hydration process and the physical adsorption capacity of the hydration products to the chloride ions are promoted, and meanwhile, the mechanical property of the high-chlorine fly ash cementing material is also promoted.
Description
Technical Field
The invention belongs to the technical field of building materials, and particularly relates to a high-chlorine fly ash cementing material and a preparation method thereof.
Background
The fly ash is a main solid waste discharged in the power generation process of a coal-fired power plant and is an artificial volcanic ash material. At present, the most important way of utilizing fly ash comprehensively is still in the aspects of building and building materials, such as cement production or admixture of concrete. The high-chlorine fly ash has high chloride ion content, and if the high-chlorine fly ash is prepared into a cementing material to be used in concrete, the high-chlorine fly ash can have certain influence on the durability of the concrete. In a common environment, corrosive ions such as chloride ions and the like migrate to the interior through cracks, capillary pores and the like of concrete, so that destructive expansion such as corrosion of reinforcing steel bars, salt crystallization and the like is caused, and the concrete structure has poor durability and short service life.
In the prior art, the porosity of slurry is reduced, the pore diameter is refined, the corrosion rate of chloride ions is delayed, and the anti-corrosion performance of a cementing material is improved by adopting the modes of reducing the water-cement ratio, using an admixture, reducing the fineness of the cementing material and the like. However, in actual construction, the water cement ratio regulation range is small, and the requirements on the working performance and the mechanical property of the cementing material are high, so that the traditional method has a limited effect of improving the chloride ion corrosion resistance of the cement paste. And because the high-chlorine fly ash has higher concentration of free chloride ions, the high-chlorine fly ash can cause the concentration of the chloride ions to exceed the standard no matter the high-chlorine fly ash is used as an admixture of cement or concrete, so that reinforcing steel bars in the concrete are corroded, and the safety of concrete members is influenced. The cementing material prepared by using the fly ash at present has the defects of low activity and low reaction speed, and has no major breakthrough in the preparation of the cementing material.
Disclosure of Invention
The invention aims to provide a high-chlorine fly ash cementing material and a preparation method thereof aiming at the defects of the prior art. According to the invention, the high-chlorine fly ash is used as a main raw material, the activity of inert minerals in the high-chlorine fly ash is excited in a composite activation mode, and the obtained high-chlorine fly ash cementing material has good chloride ion curing capacity and good mechanical property, so that an effective way is provided for high added value utilization of the high-chlorine fly ash.
In order to achieve the purpose, the technical scheme adopted by the invention is as follows: a preparation method of a high-chlorine fly ash cementing material comprises the following steps:
(1) respectively carrying out ball milling treatment on the high-chlorine fly ash, the slag and the mineral micro powder for 4-8 h;
(2) uniformly mixing the high-chlorine fly ash, the slag and the mineral micro powder after ball milling treatment;
(3) and (3) adding an early strength agent and an alkali activator into the mixture obtained in the step (2) and uniformly mixing to obtain the high-chlorine fly ash cementing material.
The high-chlorine fly ash is subjected to a composite activation process, namely a physical and chemical activation method, so that the potential volcanic ash activity of the high-chlorine fly ash is excited. Physical activation, namely mechanical ball milling, enables high-chlorine fly ash particles to be refined, on the one hand, the high-chlorine fly ash particles are better filled in gaps of cement particles, and the micro-aggregate effect and the morphological effect are exerted. On the other hand, the high-chlorine fly ash particles are refined, so that the crystal structure of the mineral can be damaged, the surface energy of the powder material is improved, and the energy required by the mineral participating in the hydration reaction is reduced, so that the reaction activity of the high-chlorine fly ash is enhanced. The high-chlorine fly ash is ball-milled, so that the curing capability of the cement material on chloride ions is improved, the curing capability is increased along with the improvement of the fineness of the high-chlorine fly ash, and the curing of the chloride ions is promoted to a certain extent. The chemical activation, namely the addition of the alkaline activator can excite the volcanic ash activity of the high-chlorine fly ash, and the excitation effect on the fly ash system is more sufficient along with the increase of the hydration age. In an alkaline environment, Si-O and Al-O bonds on the surface of the fly ash particles are broken. Reduction of polymerization degree of Si-O-Al network polymerFree unsaturated active bond formed on the surface, easily reacting with Ca (OH)2The reaction generates gelling products such as calcium silicate hydrate, aluminum silicate hydrate and the like, and the higher the hydration degree is, the more hydration products are generated.
C-S-H gel and AFt in hydration products of the high-chlorine fly ash cementing material have the adsorption and solidification effects on chloride ions, and the adsorption effect of the C-S-H gel is strong; the curing mechanism of C-S-H gel and AFt on chloride ions is different, the C-S-H gel belongs to chemical curing and the AFt belongs to physical curing. Ca (OH) exists in high-chlorine fly ash cementing material at the initial stage of hydration reaction2In the presence of chlorine ions, under alkaline conditions, the chlorine ions can be dissolved out of high-activity Al in the cementing material2O3The reaction produces a Friedel salt. Finally, the generated Friedel salt and mineral particles which do not participate in the reaction block pores together, reduce the capillary porosity of the slurry, improve the pore structure property and play a good role of micro-aggregates. The high-chlorine fly ash used in the invention can consume Ca (OH) generated by hydration of cement clinker2The method has the advantages that secondary hydration reaction is more sufficient, C-S-H gel with low alkalinity and low calcium-silicon ratio and more AFt products with low dissolubility and better chloride ion adsorption are formed, abundant hydration products have good filling effect on the slurry, the compactness of the slurry is improved, the transmission efficiency of free chloride ions in pores is reduced, and the hardened slurry has good solidification effect on the chloride ions.
In a preferred embodiment of the present invention, in the step (1), the ball-milling process has a ball-to-material ratio of 1:6 to 1: 3.
The ball-milling ball-material ratio can influence the ball-milling content of the material, and the ball-material ratio is too large, so that the useless power loss of impact friction between grinding bodies and between the grinding bodies and a lining plate can be increased, the power consumption is increased, the ball consumption is increased, and the yield is reduced; if the ball material ratio is too small, it indicates that too much material is stored in the mill, which will generate a buffering effect and will also reduce the grinding efficiency.
As a preferred embodiment of the invention, in the step (1), the high-chlorine fly ash is firstly dried until the moisture is less than or equal to 1%, and the drying temperature is 103-107 ℃.
As a preferred embodiment of the present invention,the specific surface area of the high-chlorine fly ash subjected to ball milling treatment is 500-600m2/kg。
The fly ash particles are in a porous honeycomb structure, have large specific surface area and high adsorption activity. The specific surface area of the fly ash has great influence on the reaction degree of the fly ash, the larger the specific surface area is, the longer the hydration period is, and the reaction degree of the fly ash is continuously increased. A large number of experiments prove that the specific surface area of the high-chlorine fly ash is 500-600m2At/kg, the reaction degree of the fly ash is optimal, and the chlorine fixing capacity and the mechanical property are both optimal.
As a preferred embodiment of the present invention, the specific surface area of the slag after the ball milling treatment is 500-600m2Per kg; the specific surface area of the mineral micro powder after ball milling treatment is 500-600m2/kg。
As a preferred embodiment of the invention, the weight ratio of the high-chlorine fly ash, the slag, the mineral micropowder, the early strength agent and the alkali excitant is as follows: high-chlorine fly ash: slag: mineral micro powder: drought-strengthener: alkali activator 40-90: 30-60: 20-60: 1-5: 1-10.
High-chlorine fly ash is made of Al2O3And SiO2The fine glass body as main component has low Ca/Si ratio although its Al content is high, and the glass body with 50-80% content is the main source of high chlorine flyash activity. The potential volcanic ash activity in the high-chlorine fly ash is excited by a chemical activation method, when an alkali activator is uniformly mixed with the high-chlorine fly ash, a hydroxyl group (OH-) starts to carry out chemical erosion damage on the surface of the high-chlorine fly ash, gradually destroys the silica-alumina three-dimensional network structure of the high-chlorine fly ash, and diffuses into the glass body, so that the glass body structure is further dissociated to dissolve part of active Si and Al, and the active Si and Al are changed into oligomers such as silica tetrahedron, alumina tetrahedron and the like. Because the structure of the silicon-oxygen tetrahedron and the aluminum-oxygen tetrahedron is unstable and easy to generate polycondensation reaction, new aluminosilicate polymer gel which is formed by mutual crosslinking of silicon oxygen and the aluminum-oxygen tetrahedron and has high polymerization degree and a space network structure is formed, the aluminosilicate polymer gel is deposited inside and outside a high-chlorine fly ash particle vitreous body and wraps and covers the unreacted part to further resistPreventing the reaction from continuing. The generated aluminosilicate polymer gel tightly bonds the high-chlorine fly ash glass body and chloride ions to form a compact network structure, thereby obviously improving the integrity of curing chloride ions.
Besides the hydration product generated by the coal ash participating in the hydration reaction can adsorb and solidify part of chloride ions, the coal ash also has a separate adsorption effect on the chloride ions, which is the reason that the coal ash has a strong solidification effect. The high-chlorine fly ash is porous honeycomb-shaped in appearance, small in particle size, large in specific surface area, strong in adsorption performance, and has a morphological effect and a micro-aggregate effect. Because of the inherent volcanic ash property of the high-chlorine fly ash, the high-chlorine fly ash can slowly perform secondary reaction with calcium hydroxide precipitated in the cement hydration process to form a volcanic ash reaction product on the surface, and the volcanic ash reaction product is firmly combined with a cement slurry hardened body lattice, so that the later strength is increased, and the impermeability and the durability of cement stone or concrete are improved.
The slag also has strong pozzolanic activity, and can generate hydrated aluminosilicate, hydrated calcium silicate gel and zeolite phase crystals with low calcium-silicon ratio in alkaline environment. Slag is added into the high-chlorine fly ash, so that more calcium silicate gel can be generated, and the effect of curing chloride ions is better.
The high-chlorine fly ash, the slag, the mineral micro powder, the drought strength agent and the alkali activator are mutually and synergistically excited in the high-chlorine fly ash cementing material, the particle size fraction and the activity of each raw material are fully exerted, and abundant hydration products Friedel salt, AFt crystal and C-S-H gel are formed, so that the chemical binding capacity of minerals and chloride ions in the hydration process and the physical adsorption capacity of the hydration products to the chloride ions are promoted. Meanwhile, a large amount of hydration products are mutually interwoven, and the filling effect of the superfine particle micro powder which does not participate in the reaction ensures that the hardening system of the cementing material is more perfect, and the transmission capability of free chloride ions in pores is further reduced.
As a preferred embodiment of the present invention, the fine mineral powder is a mixture of silica fume and rice husk ash.
The main component of the silica fume is amorphous silica which is fine powder with high volcanic ash activity and can accelerate a cementing material systemHydration, and good filling effect of the micro aggregate is achieved. The rice hull ash contains a large amount of SiO2Active ingredient, capable of reacting with Ca (OH)2The reaction produces calcium silicate polymer, which has adsorption effect on chloride ion. Silica fume and rice hull ash are added into the high-chlorine fly ash cementing material, so that the quantity of hydration products and the microstructure of a concrete system can be changed. With the secondary hydration of the high-chlorine fly ash cementing material, hydration products and Ca (OH) in the system2The calcium silicate hydrate has stronger adsorption effect on chloride ions due to the huge specific surface area, so that the cement doped with the auxiliary cementing material has stronger chloride ion binding capacity, and meanwhile, the content of tricalcium aluminate in the material is changed, so that Friedel salt is generated by chemical curing, and the curing capacity on the chloride ions is improved.
As a preferred embodiment of the present invention, the rice hull ash is low temperature rice hull ash.
The low temperature rice hull ash was burned at 600 ℃ and then ground into powdered rice hull ash. The low-temperature rice hull ash contains micron-sized honeycomb holes formed by interlacing rice hull fiber sheets and nano-sized SiO2The gel ions are not tightly agglomerated to form nano pores, so that the low-temperature rice hull ash has a large specific surface area and ultrahigh pozzolanic activity.
As a preferred embodiment of the present invention, the weight ratio of the silica fume to the rice husk ash is 1-3: 1-3.
A large number of experiments prove that the silica fume and the rice hull ash are in the above proportioning range, and the high-chlorine fly ash cementing material has the best chlorine fixing effect and mechanical property.
In a preferred embodiment of the present invention, in the step (1), the silica fume and the rice husk ash are ball-milled separately.
In a preferred embodiment of the present invention, the early strength agent is at least one of triethanolamine and triisopropanolamine.
The addition of the drought-strengthener triethanolamine or triisopropanolamine promotes the hydration of tricalcium aluminate, the resulting hydrated product fills the capillary pores, so that Ca (OH)2OfThe length is limited. The triethanolamine is added to accelerate the consumption of the ettringite, promote the ettringite to generate AFt and further improve the binding capacity of chloride ions, and the chloride ions can replace sulfate ions in the AFt and further generate Friedel salt.
In a preferred embodiment of the present invention, the alkali activator is at least one of calcium hydroxide, sodium hydroxide, and water glass.
The invention also claims a chlorine fly ash cementing material prepared by the preparation method of the high-chlorine fly ash cementing material.
Compared with the prior art, the invention has the following beneficial effects: the high-chlorine fly ash is subjected to a composite activation process, namely a physical and chemical activation method, so that the potential volcanic ash activity of the high-chlorine fly ash is excited, and the best effect of curing chloride ions is achieved. Physical curing is embodied in the binding capacity of the mineral material itself to chloride ions, and chemical curing is the formation of other products from chloride ions and hydration products. The high-chlorine fly ash, the slag, the mineral micro powder, the drought-strengthening agent and the alkali activator in the cementing material are mutually cooperated to have an excitation effect, the particle size fraction and the activity of each raw material are fully exerted, and abundant hydration products Friedel salt, AFt crystal and C-S-H gel are formed, so that the chemical binding capacity of minerals and chloride ions in the hydration process and the physical adsorption capacity of the hydration products to the chloride ions are promoted. Meanwhile, a large amount of hydration products are mutually interwoven, and the filling effect of the superfine particle micro powder which does not participate in the reaction ensures that the hardening system of the cementing material is more perfect, and the transmission capability of free chloride ions in pores is further reduced.
Detailed Description
To better illustrate the objects, aspects and advantages of the present invention, the present invention will be further described with reference to specific examples.
Example 1
The high-chlorine fly ash cementing material comprises the following raw materials:
60 parts of high-chlorine fly ash, 40 parts of slag, 10 parts of silica fume, 10 parts of rice hull ash, 5 parts of a drought strength agent and 3 parts of an alkali activator.
The preparation method of the high-chlorine fly ash cementing material comprises the following steps:
(1) drying high-chlorine pulverized coal at 105 ℃ until the water content is less than or equal to 1%;
(2) respectively performing ball milling treatment on the high-chlorine fly ash, the slag, the silica fume and the rice hull ash, and then uniformly mixing;
(3) and (3) uniformly mixing the mixture obtained in the step (2) with an early strength agent and an alkali activator to obtain the high-chlorine fly ash cementing material.
The specific surface areas of the high-chlorine fly ash, the slag, the silica fume and the rice hull ash after ball milling treatment are all 550m2/kg。
Example 2
The high-chlorine fly ash cementing material comprises the following raw materials:
40 parts of high-chlorine fly ash, 60 parts of slag, 30 parts of silica fume, 20 parts of rice hull ash, 1 part of drought-strengthening agent and 1 part of alkali-activating agent.
The preparation method of the high-chlorine fly ash cementing material comprises the following steps:
(1) drying high-chlorine pulverized coal at 103 ℃ until the water content is less than or equal to 1%;
(2) respectively performing ball milling treatment on the high-chlorine fly ash, the slag, the silica fume and the rice hull ash, and then uniformly mixing;
(3) and (3) uniformly mixing the mixture obtained in the step (2) with an early strength agent and an alkali activator to obtain the high-chlorine fly ash cementing material.
The specific surface areas of the high-chlorine fly ash, the slag, the silica fume and the rice hull ash after ball milling treatment are all 500m2/kg。
Example 3
The high-chlorine fly ash cementing material comprises the following raw materials:
90 parts of high-chlorine fly ash, 30 parts of slag, 20 parts of silica fume, 30 parts of rice hull ash, 3 parts of a drought strength agent and 10 parts of an alkali activator.
The preparation method of the high-chlorine fly ash cementing material comprises the following steps:
(1) drying high-chlorine pulverized coal at 107 ℃ until the water content is less than or equal to 1%;
(2) respectively performing ball milling treatment on the high-chlorine fly ash, the slag, the silica fume and the rice hull ash, and then uniformly mixing;
(3) and (3) uniformly mixing the mixture obtained in the step (2) with an early strength agent and an alkali activator to obtain the high-chlorine fly ash cementing material.
The specific surface areas of the high-chlorine fly ash, the slag, the silica fume and the rice hull ash after ball milling treatment are all 600m2/kg。
Comparative example 1
The raw materials of the high-chlorine fly ash cementing material comprise:
60 parts of high-chlorine fly ash, 40 parts of slag, 10 parts of silica fume, 10 parts of rice hull ash, 5 parts of a drought strength agent and 3 parts of an alkali activator.
The preparation method of the high-chlorine fly ash cementing material comprises the following steps:
(1) drying high-chlorine pulverized coal at 105 ℃ until the water content is less than or equal to 1%;
(2) uniformly mixing high-chlorine fly ash, slag, silica fume and rice hull ash;
(3) and (3) uniformly mixing the mixture obtained in the step (2) with an early strength agent and an alkali activator to obtain the high-chlorine fly ash cementing material.
Comparative example 2
The raw materials of the high-chlorine fly ash cementing material comprise:
60 parts of high-chlorine fly ash, 40 parts of slag, 10 parts of silica fume, 5 parts of a drought strength agent and 3 parts of an alkali activator.
The preparation method of the high-chlorine fly ash cementing material comprises the following steps:
(1) drying high-chlorine pulverized coal at 105 ℃ until the water content is less than or equal to 1%;
(2) respectively performing ball milling treatment on the high-chlorine fly ash, the slag, the silica fume and the rice hull ash, and then uniformly mixing;
(3) and (3) uniformly mixing the mixture obtained in the step (2) with an early strength agent and an alkali activator to obtain the high-chlorine fly ash cementing material.
The high-chlorine fly ash and slag after ball milling treatmentAnd the specific surface areas of the silica fume and the silica fume are both 550m2/kg。
Comparative example 3
The raw materials of the high-chlorine fly ash cementing material comprise:
60 parts of high-chlorine fly ash, 40 parts of slag, 10 parts of silica fume, 10 parts of rice hull ash and 3 parts of alkali activator.
The preparation method of the high-chlorine fly ash cementing material comprises the following steps:
(1) drying high-chlorine pulverized coal at 105 ℃ until the water content is less than or equal to 1%;
(2) respectively performing ball milling treatment on the high-chlorine fly ash, the slag, the silica fume and the rice hull ash, and then uniformly mixing;
(3) and (3) uniformly mixing the mixture obtained in the step (2) with an alkali activator to obtain the high-chlorine fly ash cementing material.
The specific surface areas of the high-chlorine fly ash, the slag, the silica fume and the rice hull ash after ball milling treatment are all 550m2/kg。
Comparative example 4
The raw materials of the high-chlorine fly ash cementing material comprise:
60 parts of high-chlorine fly ash, 40 parts of slag, 10 parts of silica fume, 10 parts of rice hull ash, 5 parts of a drought strength agent and 3 parts of an alkali activator.
The preparation method of the high-chlorine fly ash cementing material comprises the following steps:
(1) drying high-chlorine pulverized coal at 105 ℃ until the water content is less than or equal to 1%;
(2) respectively performing ball milling treatment on the high-chlorine fly ash, the slag, the silica fume and the rice hull ash, and then uniformly mixing;
(3) and (3) uniformly mixing the mixture obtained in the step (2) with an early strength agent and an alkali activator to obtain the high-chlorine fly ash cementing material.
The specific surface areas of the high-chlorine fly ash, the slag, the silica fume and the rice hull ash after ball milling treatment are all 300m2/kg。
Comparative example 5
The raw materials of the high-chlorine fly ash cementing material comprise:
100 parts of high-chlorine fly ash, 25 parts of slag, 8 parts of silica fume, 35 parts of rice hull ash, 6 parts of a drought strength agent and 0.5 part of an alkali activator.
The preparation method of the high-chlorine fly ash cementing material comprises the following steps:
(1) drying high-chlorine pulverized coal at 105 ℃ until the water content is less than or equal to 1%;
(2) respectively performing ball milling treatment on the high-chlorine fly ash, the slag, the silica fume and the rice hull ash, and then uniformly mixing;
(3) and (3) uniformly mixing the mixture obtained in the step (2) with an early strength agent and an alkali activator to obtain the high-chlorine fly ash cementing material.
The specific surface areas of the high-chlorine fly ash, the slag, the silica fume and the rice hull ash after ball milling treatment are all 550m2/kg。
Test example: performance testing
The high-chlorine fly ash cementing materials prepared in examples 1-3 and comparative examples 1-5 are molded into mortar test pieces according to GB/T17671-1999 Cement mortar Strength test method (ISO method). And (3) curing the molded test piece for 1 day in a standard manner, then demolding, and curing the test piece to a corresponding age period to perform chloride ion curing performance test and mechanical performance test. For comparison, a set of pure cement was made as a control, the cement being PO42.5 cement. Wherein the curing temperature is as follows: 20 ± 2 ℃, relative humidity: more than or equal to 95 percent.
TABLE 1 test results of chloride ion curability and fracture and compression resistance of the mortar test pieces prepared in examples 1-3, comparative examples 1-5 and control group
As can be seen from the results in Table 1, the high-chlorine fly ash binding materials prepared in examples 1-3 of the present invention have better chloride ion curability and mechanical properties than those of the comparative examples and the control group. From comparative example 1, it can be seen that the physical activation method, i.e., ball milling mechanical treatment, has an effect of promoting the chloride ion curability and mechanical properties of the high-chlorine fly ash cementitious material. From the test results of comparative examples 2-3, it can be seen that the rice hull ash and the early strength agent have certain influence on the chloride ion curing capability of the high-chlorine fly ash binding material. From the test results of comparative example 4, it can be seen that the specific surface areas of the high-chlorine fly ash, slag, silica fume and rice hull ash after ball milling have a great influence on the chloride ion curability and mechanical properties of the high-chlorine fly ash cementitious material. Further, from the results of comparative example 5, it is understood that the addition amount of each of the preparation raw materials of the present invention has good chloride ion curability and mechanical properties within the range defined by the present invention.
Although the present invention has been described in detail with reference to the preferred embodiments, it will be understood by those skilled in the art that various changes may be made and equivalents may be substituted for elements thereof without departing from the true spirit and scope of the present invention.
Claims (10)
1. The preparation method of the high-chlorine fly ash cementing material is characterized by comprising the following steps of:
(1) respectively carrying out ball milling treatment on the high-chlorine fly ash, the slag and the mineral micro powder for 4-8 h;
(2) uniformly mixing the high-chlorine fly ash, the slag and the mineral micro powder after ball milling treatment;
(3) and (3) adding an early strength agent and an alkali activator into the mixture obtained in the step (2) and uniformly mixing to obtain the high-chlorine fly ash cementing material.
2. The method for preparing the high-chlorine fly ash cementing material as claimed in claim 1, wherein the specific surface area of the high-chlorine fly ash after the ball milling treatment is 500-600m2/kg。
3. The method for preparing the high-chlorine fly ash cementing material as claimed in claim 1, wherein the specific surface area of the slag after the ball milling treatment is 500-600m2Per kg; the specific surface area of the mineral micro powder after ball milling treatment is 500-600m2/kg。
4. The method for preparing the high-chlorine fly ash cementing material according to claim 1, wherein the weight ratio of the high-chlorine fly ash, the slag, the mineral micropowder, the early strength agent and the alkali activator is as follows: high-chlorine fly ash: slag: mineral micro powder: drought-strengthener: alkali activator 40-90: 30-60: 20-60: 1-5: 1-10.
5. The method for preparing high-chlorine fly ash binding material according to claim 4, wherein the mineral micropowder is a mixture of silica fume and rice hull ash.
6. The method for preparing the high-chlorine fly ash binding material as claimed in claim 5, wherein the rice hull ash is low-temperature rice hull ash.
7. The method for preparing the high-chlorine fly ash cementing material according to claim 5, wherein the weight ratio of the silica fume to the rice husk ash is 1-3: 1-3.
8. The method for preparing the high-chlorine fly ash cementing material according to claim 1, wherein the early strength agent is at least one of triethanolamine and triisopropanolamine.
9. The method for preparing high-chlorine fly ash cementing material according to claim 1, wherein the alkali activator is at least one of calcium hydroxide, sodium hydroxide and water glass.
10. The high-chlorine fly ash cementing material prepared by the preparation method of the high-chlorine fly ash cementing material according to any one of claims 1 to 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110108707.4A CN112960924B (en) | 2021-01-27 | 2021-01-27 | High-chlorine fly ash cementing material and preparation method thereof |
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| CN113695361A (en) * | 2021-08-31 | 2021-11-26 | 西南科技大学 | Chlorine-containing titanium extraction slag, chloride ion curing method thereof and method for preparing engineering material |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20020000179A1 (en) * | 2000-02-08 | 2002-01-03 | Mehta Povindar K. | Method for producing a blended cementitious composition |
| TW200906762A (en) * | 2007-08-07 | 2009-02-16 | Univ Tamkang | Process for regenerating the MSWI fly ash as the cement material |
| TW201200486A (en) * | 2010-06-17 | 2012-01-01 | Hou mei li | Concrete containing rice hull ash |
| CN106746826A (en) * | 2017-01-10 | 2017-05-31 | 吉林建筑大学 | A kind of new alkali-activated slag fly ash gel material retarder and preparation method |
| CN106746851A (en) * | 2016-12-29 | 2017-05-31 | 北京工业大学 | A kind of method of chlorion crystallized ability in raising hydrated cement paste |
| CN108129051A (en) * | 2017-12-29 | 2018-06-08 | 江苏苏博特新材料股份有限公司 | A kind of long-term efficiently concrete admixture of curing of chloride ion and application |
-
2021
- 2021-01-27 CN CN202110108707.4A patent/CN112960924B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20020000179A1 (en) * | 2000-02-08 | 2002-01-03 | Mehta Povindar K. | Method for producing a blended cementitious composition |
| TW200906762A (en) * | 2007-08-07 | 2009-02-16 | Univ Tamkang | Process for regenerating the MSWI fly ash as the cement material |
| TW201200486A (en) * | 2010-06-17 | 2012-01-01 | Hou mei li | Concrete containing rice hull ash |
| CN106746851A (en) * | 2016-12-29 | 2017-05-31 | 北京工业大学 | A kind of method of chlorion crystallized ability in raising hydrated cement paste |
| CN106746826A (en) * | 2017-01-10 | 2017-05-31 | 吉林建筑大学 | A kind of new alkali-activated slag fly ash gel material retarder and preparation method |
| CN108129051A (en) * | 2017-12-29 | 2018-06-08 | 江苏苏博特新材料股份有限公司 | A kind of long-term efficiently concrete admixture of curing of chloride ion and application |
Non-Patent Citations (7)
| Title |
|---|
| 严建华等: "玻璃粉对粉煤灰复合硬化水泥浆氯离子结合能力影响", 《混凝土》, no. 8, 27 August 2017 (2017-08-27), pages 92 - 95 * |
| 刘国强: "碱激发矿渣对氯离子的固化机制研究", 《中国优秀博硕士学位论文全文数据库(硕士)工程科技Ⅱ辑》 * |
| 刘国强: "碱激发矿渣对氯离子的固化机制研究", 《中国优秀博硕士学位论文全文数据库(硕士)工程科技Ⅱ辑》, no. 05, 15 May 2019 (2019-05-15), pages 1 - 66 * |
| 刘数华等: "《混凝土辅助胶凝材料》", vol. 1, 30 June 2010, 中国建材工业出版社, pages: 137 * |
| 夏伯才主编: "《土木工程材料》", vol. 1, 28 February 2013, 中山大学出版社, pages: 101 - 102 * |
| 张程浩等: "碱激发粉煤灰固定氯离子能力及其机理的研究", 《唐山学院学学报》 * |
| 张程浩等: "碱激发粉煤灰固定氯离子能力及其机理的研究", 《唐山学院学学报》, vol. 26, no. 03, 20 May 2013 (2013-05-20), pages 40 - 42 * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113695361A (en) * | 2021-08-31 | 2021-11-26 | 西南科技大学 | Chlorine-containing titanium extraction slag, chloride ion curing method thereof and method for preparing engineering material |
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