CN113149547A - Alkali-activated regenerated clay brick powder cementing material and preparation method and application thereof - Google Patents

Alkali-activated regenerated clay brick powder cementing material and preparation method and application thereof Download PDF

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CN113149547A
CN113149547A CN202110318396.4A CN202110318396A CN113149547A CN 113149547 A CN113149547 A CN 113149547A CN 202110318396 A CN202110318396 A CN 202110318396A CN 113149547 A CN113149547 A CN 113149547A
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alkali
clay brick
activated
parts
brick powder
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CN113149547B (en
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刘军
徐长伟
葛星
刘润清
李瑶
杨元全
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Shenyang Ligong University
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Shenyang Ligong University
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    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
    • C04B28/02—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing hydraulic cements other than calcium sulfates
    • C04B28/04—Portland cements
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • 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
    • 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
    • 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 discloses an alkali-activated regenerated clay brick powder cementing material and a preparation method and application thereof, wherein the alkali-activated regenerated clay brick powder cementing material comprises a component A and a component B; the component A comprises the following components in parts by weight: 10-25 parts of clay brick powder; 3-7 parts of dolomite micro powder; 15-17 parts of fly ash; 42.5 parts of 18-41 parts of ordinary portland cement; 50-75 parts of fine sand; the component B comprises the following components: 1-4 parts of a composite excitant. The invention can improve the utilization rate of the clay brick powder by more than 13 percent, does not remarkably reduce the strength of the concrete, utilizes a large amount of waste clay bricks and fly ash in the production process, reduces the using amount of cement in the concrete, further realizes low carbon and environmental protection, and has good engineering application prospect.

Description

Alkali-activated regenerated clay brick powder cementing material and preparation method and application thereof
Technical Field
The invention relates to the fields of resource utilization of solid wastes and environmental protection and energy conservation, in particular to an alkali-activated regenerated clay brick powder cementing material and a preparation method and application thereof.
Background
According to reports, China has produced 200 hundred million m in the past 50 years3And left and right clay bricks, which will be discarded with the removal, and which, according to the estimation, account for about 30% -50% of the total construction waste. The waste clay brick has abundant sources, which mainly include: (1) the waste clay bricks produced by dismantling the brick-concrete structure in the last century due to the expiration of the service life or the urbanization development are also one of the main sources of the brick-concrete structure; (2) red bricks which are discarded or over-fired due to deformation during brick firing; (3) waste red bricks are produced due to collapse of buildings caused by natural disasters (earthquakes, fires, floods, etc.) and human accidents (wars, etc.). If the amount of the building garbage generated by Wenchuan earthquake in 08 is more than 5 hundred million tons, and the red brick building garbage accounts for 30-50% of the total building garbage amount, the amount of the generated waste red brick garbage reaches 1.5-2.5 million tons.
At present, the building waste in China is difficult to sort and has low classification degree, most of the waste is mixed and collected, and most of the waste bricks are regarded as waste residue soil to be simply buried. The problems of low investment, incomplete regulation, low environmental awareness of construction workers and the like generally exist in the construction waste treatment. The technology level of waste brick treatment and resource utilization in China is still behind in developed countries, a new technology and a new process are lacked, and equipment is behind, so that the method becomes an important problem of large-scale resource utilization of waste bricks.
Disclosure of Invention
In view of the above, the invention aims to provide an alkali-activated regenerated clay brick powder cementing material, and a preparation method and application thereof, the alkali-activated prefabricated block material prepared from the regenerated clay brick powder can improve the utilization rate of the clay brick powder by 20%, the strength of concrete is not remarkably reduced, a large amount of waste clay bricks and fly ash are utilized in the production process, and the cement consumption in the concrete is reduced, and the material has the advantages of convenience in preparation operation, excellent mechanical properties, environmental friendliness and the like.
The purpose of the invention and the technical problem to be solved are realized by adopting the following technical scheme. The invention provides an alkali-activated regenerated clay brick powder cementing material, which comprises a component A and a component B; the component A comprises the following components in parts by weight: 10-25 parts of clay brick powder; 3-7 parts of dolomite micro powder; 15-17 parts of fly ash; 42.5 parts of 18-41 parts of ordinary portland cement; 50-75 parts of fine sand; the component B comprises the following components: 1-4 parts of a composite excitant.
Further, in the alkali-activated regenerated clay brick powder cementing material, the specific surface area of the clay brick powder is 1600-1700m2/kg。
Further, in the alkali-activated regenerated clay brick powder cementing material, the clay brick powder comprises the following components in percentage by weight: SiO 22 60％～70％；Al2O3 15％～30％；Fe2O34％～6％；CaO 3％～5％；K2O and Na2O 1％～3％。
Further, in the alkali-activated regenerated clay brick powder cementing material, the specific surface area of the dolomite micro powder is 1400-1500 m2/kg。
Further, in the alkali-activated regenerated clay brick powder cementing material, the fly ash is second-grade fly ash, and the screen allowance of the fly ash passing through a 45-micrometer square-hole sieve is 20-25%.
Further, in the alkali-activated regenerated clay brick powder cementing material, the fineness modulus of the fine sand is 1.6-2.2.
Further, in the alkali-activated regenerated clay brick powder cementing material, in step S2, the composite activator includes calcium oxide and sodium hydroxide in a weight ratio of 3:1 to 5: 1.
The purpose of the invention and the technical problem to be solved are realized by adopting the following technical scheme. The invention provides a preparation method of an alkali-activated regenerated clay brick powder cementing material, which comprises the following steps:
s1a, weighing clay brick powder, dolomite micro powder, fly ash, 42.5 common portland cement and fine sand according to the formula ratio, and uniformly mixing to obtain a component A;
s2a, weighing the compound excitant with the formula amount to obtain the component B.
The purpose of the invention and the technical problem to be solved are realized by adopting the following technical scheme. The invention provides a preparation method of an alkali-activated prefabricated block material, which comprises the following steps:
S1B, weighing 32-35 parts by weight of water and 1-4 parts by weight of the component B of the alkali-activated regenerated clay brick powder cementing material, pouring the mixture into the component A, and stirring the mixture for 2-4 min at a speed of 100-120 r/min to obtain uniform slurry;
and S2b, forming and maintaining the slurry obtained in the step S1b to obtain the alkali-activated precast block material.
Further, in the preparation method of the alkali-activated prefabricated block material, in the step S2b, the molding temperature is 20 ℃ ± 5 ℃, the humidity is 90% -95%, and the time is 24 hours; the curing temperature is 20 +/-5 ℃, and the curing time is 7 days or 28 days when the humidity is 90-95%.
The purpose of the invention and the technical problem to be solved are realized by adopting the following technical scheme. The alkali-activated prefabricated block material provided by the invention has the 7d compressive strength of 10.0-12.5MPa and the 28d compressive strength of 30-33.0MPa, and is prepared by the method.
Compared with the prior art, the alkali-activated regenerated clay brick powder cementing material and the preparation method and the application thereof have the following advantages and effects:
the alkali-activated precast block disclosed by the invention is composed of calcium oxide and sodium hydroxide as alkali activators, and fly ash and dolomite micro powder are adopted to adjust the particle composition of the material, a physicochemical reaction caused in the alkali-activated process can enable the material to form a compact cross-linked structure so as to realize the utilization of regenerated clay brick powder and the improvement of material strength, the utilization rate of the clay brick powder can be improved by more than 13%, the concrete strength cannot be obviously reduced, a large amount of fly ash is fully utilized in the preparation process, and the comprehensive utilization of waste clay bricks and industrial fly ash is facilitated;
the alkali-activated precast block can replace 60% of cement in concrete, and can greatly reduce the cost of the traditional concrete material;
the preparation method of the alkali-activated precast block has controllability; when the chemical composition of the adopted waste clay brick can not meet the requirements, the components of the waste clay brick can be regulated and controlled by doping corresponding oxides so as to meet the alkali excitation requirements, thereby improving the available range of the regenerated clay brick;
the preparation method of the alkali-activated precast block body is convenient to construct, simple to operate and capable of being operated on site.
The foregoing is a summary of the present invention, and in order to provide a clear understanding of the technical means of the present invention and to be implemented in accordance with the present specification, the following is a detailed description of the preferred embodiments of the present invention.
Detailed Description
To further illustrate the technical means and effects of the present invention for achieving the predetermined objects, the following detailed description will be given to an alkali-activated recycled clay brick powder binding material, a preparation method thereof, and specific embodiments, structures, characteristics and effects thereof according to the present invention. In the following description, different "one embodiment" or "an embodiment" refers to not necessarily the same embodiment. Furthermore, the particular features, structures, or characteristics may be combined in any suitable manner in one or more embodiments.
The invention provides an alkali-activated regenerated clay brick powder cementing material, which comprises a component A and a component B; the component A comprises the following components in parts by weight: 10-25 parts of clay brick powder; 3-7 parts of dolomite micro powder; 15-17 parts of fly ash; 42.5 parts of 18-41 parts of ordinary portland cement; 50-75 parts of fine sand; the component B comprises the following components: 1-4 parts of a composite excitant.
In the specific implementation process, the first-stage reactor,wherein the specific surface area of the clay brick powder can be 1600-1700m2/kg, preferably in the range 1620-1650m2And/kg, the alkali-activated concrete prepared by adopting the clay brick powder with the specific surface area within the range can improve the utilization rate of the clay brick powder by 13 percent without obviously reducing the strength of the concrete.
In specific implementation, the clay brick powder comprises the following components in percentage by weight: SiO 22 60％～70％；Al2O3 15％～30％；Fe2O3 4％～6％；CaO 3％～5％；K2O and Na2O1-3%. Preferably, the clay brick powder comprises the following components in percentage by weight: SiO 22 62％；Al2O3 25％；Fe2O35 percent; 4% of CaO; the balance being K2O and Na2And O. The optimized clay brick powder can form optimal matching with the composite alkali activator, and the activity of the clay brick powder is further improved.
In the specific implementation, the specific surface area of the dolomite micro powder is 1400-1500 m2/kg, preferably 1460m2In kg, thus the optimized dolomite micro powder particles can be matched with the regenerated clay brick powder to form a compact stacking structure.
In specific implementation, the fly ash is second-level fly ash, the screen allowance of the fly ash passing through a 45-micron square-hole sieve is 20% -25%, and the screen allowance of the fly ash passing through the 45-micron square-hole sieve is preferably 21.5%, so that the optimized fly ash can form a compact stacking structure with the clay brick powder and the dolomite micro powder, and the strength of concrete prepared by using the alkali-activated recycled brick powder is improved.
In specific implementation, the fineness modulus of the fine sand can be 1.6-2.2, and if the fineness modulus is lower than 1.6, the water consumption is increased during the preparation of the prefabricated block material, pores are generated, and the strength of the prefabricated block material is reduced; if the fineness modulus is higher than 2.2, the compactness of the prepared prefabricated block material is reduced, and the strength is reduced.
In specific implementation, the composite activator may include calcium oxide and sodium hydroxide in a weight ratio of 3:1 to 5:1, and the preferable weight ratio is 4:1, so that the activity of the post-activated regenerated clay brick micro powder is optimal (the optimal activity index of the regenerated clay brick micro powder is 1.02).
The invention also provides a preparation method of the alkali-activated regenerated clay brick powder cementing material, which comprises the following steps:
s1a, weighing clay brick powder, dolomite micro powder, fly ash, 42.5 common portland cement and fine sand according to the formula ratio, and uniformly mixing to obtain a component A; the clay brick powder is obtained by the following steps: placing the clay brick in an oven at 105-110 ℃ for drying, weighing the clay brick once every 2-4 hours, and taking out the clay brick when the weight of clay brick powder is not changed any more; grinding the dried clay brick by a ball mill for 30-35min, and screening by a screening machine to obtain the clay brick with the specific surface area of 1600-1700m2Clay brick powder/kg;
s2a, weighing the compound excitant with the formula amount to obtain the component B.
The invention also provides a preparation method of the alkali-activated prefabricated block material, which comprises the following steps:
S1B, weighing 32-35 parts of water and 1-4 parts of the component B by weight, pouring the water and the component B into the component A (dry mixing in a stirrer), stirring for 2-4 min at a speed of 100-120 r/min, and quickly stirring for 2-3 min at a speed of 250-300 r/min to obtain uniform slurry;
s2b, injecting the slurry obtained in the step S1b into a cast iron mold with the thickness of 70.7mm multiplied by 70.7mm, placing the mold in an environment with the temperature of 20 +/-5 ℃ and the humidity of 90% -95% for 24h (molding), then demolding the test piece, finally placing the demolded test piece in a standard curing room with the temperature of 20 +/-5 ℃ and the humidity of 90% -95% for curing for 7d or 28d, and obtaining the alkali-activated precast block material.
Wherein, the calcium oxide and the sodium hydroxide are alkali excitants which can excite the activity of the clay brick powder, and the fly ash and the dolomite micro powder aim to adjust the content composition of silicon and aluminum phases in the material.
The invention also provides an alkali-activated prefabricated block material, wherein the 7d compressive strength of the alkali-activated prefabricated block material is 10.0-12.5MPa, and the 28d compressive strength of the alkali-activated prefabricated block material is 30-33MPa, and the alkali-activated prefabricated block material is prepared by the method.
The present invention is further illustrated by the following specific examples.
Example 1
The embodiment provides an alkali-activated regenerated clay brick powder cementing material, which comprises a component A and a component B; the component A comprises the following components in parts by weight: the specific surface area is 1620m216kg of clay brick powder per kg and 1460m of specific surface area23kg of dolomite micro powder per kg, 17kg of secondary fly ash, 30kg of 42.5 ordinary portland cement, 32kg of water and 68kg of fine sand with the fineness modulus of about 1.6; the component B comprises the following components: 2kg of composite exciting agent (the weight ratio of calcium oxide to sodium hydroxide is 4: 1).
The chemical composition of each raw material of the alkali-activated regenerated clay brick powder cementing material in the embodiment is shown in table 1.
Table 1 raw material chemical composition (in weight%)
Figure BDA0002992206020000051
Figure BDA0002992206020000061
The preparation method of the alkali-activated regenerated clay brick powder cementing material provided by the embodiment comprises the following steps:
s11, placing the clay brick in an oven at 105 ℃ for drying, weighing the clay brick once every 3 hours, and taking out the clay brick when the weight of the clay brick powder is not changed any more;
s12, grinding the dried clay bricks for 30min by using a ball mill, and then screening by using a screening machine to obtain the clay bricks with the specific surface area of 1620m2Clay brick powder/kg;
s13, weighing 16kg of clay brick powder, 3kg of dolomite micro powder, 17kg of fly ash, 30kg of 42.5 ordinary portland cement and 68kg of fine sand with the fineness modulus of about 1.6 according to the parts by weight, dry-mixing in a stirrer, and slowly stirring for 1min at the speed of 100r/min to obtain a dry-mixed material which is uniformly stirred to obtain a component A;
s14, weighing 2kg of composite exciting agent to obtain the component B.
The preparation method of the alkali-activated precast block material described in this embodiment includes the following steps:
s21, weighing 32kg of water and 2kg of the composite alkali activator according to parts by weight, pouring the mixture into a stirrer, slowly stirring for 2min at 100r/min to form uniform mixed solution, then placing the mixed solution and the component A obtained previously into the stirrer, slowly stirring for 1min at 100r/min, and rapidly stirring for 2min at the speed of 250r/min to finally form uniform slurry;
s22, the uniform slurry prepared in the step S21 is poured into a cast iron mold with the thickness of 70.7mm multiplied by 70.7 mm.
And S23, placing the die poured in the step S22 in an environment with the temperature of 20 ℃ and the humidity of 95% for 24 hours, then demolding the test piece, and finally placing the demolded test piece in an environment standard curing room with the temperature of 20 ℃ and the humidity of 95% for curing for 7d or 28d to obtain the alkali-activated precast block material.
Example 2
The difference between this example and example 1 is only that, in this example, the composition ratio of the alkali-activated clay brick powder cementing material is different, and the alkali-activated clay brick powder cementing material of this example comprises a component a and a component B; the component A comprises the following components in parts by weight: the specific surface area is 1600m220kg of clay brick powder per kg and 1500m of specific surface area23kg of dolomite micro powder per kg, 15kg of fly ash, 27kg of 42.5 common Portland cement, 32kg of water and 68kg of fine sand with the fineness modulus of about 1.6; the component B comprises the following components: 3kg of composite excitant (the weight ratio of calcium oxide to sodium hydroxide is 4: 1).
The rest is the same as example 1.
Example 3
The difference between this example and example 1 is only that the composition ratio of this example is different from that of the alkali-activated clay brick powder binding material, and the alkali-activated clay brick powder binding material of this example comprises a component a and a component B; by weightThe component A comprises the following components in parts by weight: the specific surface area is 1600m225kg of clay brick powder per kg and 1500m of specific surface area23kg of dolomite micro powder per kg, 15kg of fly ash, 21kg of 42.5 common Portland cement, 32kg of water and 68kg of fine sand with the fineness modulus of about 1.6; the component B comprises the following components: 4kg of composite excitant (the weight ratio of calcium oxide to sodium hydroxide is 4: 1).
The rest is the same as example 1.
Example 4
This example differs from example 1 only in that the regenerated clay brick dust (brick dust a) oxide composition differs in this example, as shown in table 2.
Table 2 raw material chemical composition (in weight%)
Components CaO SiO2 Al2O3 MgO Fe2O3 K2O SO3 Na2O loss Total of
Clay brick powder a 5.31 56.2 31.05 - 5.43 0.8 - 0.2 0.8 99.79
Cement 61.15 22.36 7.21 4.6 4.5 0.1 - - 99.92
Dolomite micropowder 31.42 1.46 0.05 20.03 0.19 0.01 - - 46.69 99.85
Fly ash 17.27 43.21 24.79 4.26 2.59 0.5 2.59 0.2 4.28 99.69
Compound excitant 84.85 - - - - - - 11.74 3.31 99.90
Fine sand 0.1 99.2 0.5 - - - - - - 99.8
As shown in table 2, the oxide composition of the regenerated clay brick powder does not fall within the range of the clay brick powder, so that the composition of the regenerated clay brick powder needs to be regulated by using oxides, and the specific method is as follows:
80kg of the regenerated brick powder (brick powder a) and active SiO are weighed220kg of micro powder is placed in a stirrer for dry mixing, and is slowly stirred for 1min at the speed of 100r/min to obtain a dry mixed material (brick powder b) which is uniformly stirred, wherein the mixed material comprises the following oxides in percentage by weight: SiO 22 63.6％、Al2O325.92％、Fe2O34.53%, CaO 4.43%, and Na2O and K2O0.83%, thus being just close to the oxide composition of the reclaimed clay brick powder in example 1. Then, 16kg of the mixed material (brick powder b) was weighed out and used as clay brick powder for construction.
The rest is the same as example 1.
Example 5
The difference between this example and example 1 is only that the raw material composition ratio of the alkali-activated clay brick powder cementing material is different, and the alkali-activated clay brick powder cementing material of this example comprises a component A and a component B; the component A comprises the following components in parts by weight: the specific surface area is 1600m210kg of clay brick powder with specific surface area of 1500m27kg of dolomite micro powder per kg, 17kg of fly ash, 33kg of 42.5 common portland cement, 32kg of water and 68kg of fine sand with the fineness modulus of about 1.6; the component B comprises the following components: 1kg of composite excitant (the weight ratio of calcium oxide to sodium hydroxide is 4: 1).
The rest is the same as example 1.
Example 6
The difference between this example and example 1 is only that the raw material composition ratio of the alkali-activated clay brick powder cementing material is different, and the alkali-activated clay brick powder cementing material of this example comprises a component A and a component B; the component A comprises the following components in parts by weight: the specific surface area is 1600m216kg of clay brick powder per kg and 1500m of specific surface area25kg of dolomite micro powder per kg, 16kg of fly ash, 25kg of 42.5 common portland cement, 35kg of water and 65kg of fine sand with the fineness modulus of about 1.6; the component B comprises the following components: 3kg of composite excitant (the weight ratio of calcium oxide to sodium hydroxide is 4: 1).
The rest is the same as example 1.
Comparative example 1
The difference between the comparative example and the example 1 is only that the proportion of calcium oxide and sodium hydroxide in the composite alkali activator adopted by the alkali-activated clay brick powder cementing material is different, and the weight ratio of calcium oxide to sodium hydroxide in the composite alkali activator adopted by the comparative example is 1: 1.
The rest is the same as example 1.
Comparative example 2
The difference between the comparative example and the example 1 is only that the ratio of calcium oxide to sodium hydroxide in the composite alkali activator adopted by the alkali-activated clay brick powder cementing material is different, and the weight ratio of calcium oxide to sodium hydroxide in the composite alkali activator adopted by the comparative example is 2: 1.
The rest is the same as example 1.
Comparative example 3
The difference between the comparative example and the example 1 is only that the ratio of calcium oxide to sodium hydroxide in the composite alkali activator adopted by the alkali-activated clay brick powder cementing material is different, and the weight ratio of calcium oxide to sodium hydroxide in the composite alkali activator adopted by the comparative example is 6: 1.
The rest is the same as example 1.
The compressive strength is the most important and key index for the alkali-activated precast block material, so that the compressive strength of the alkali-activated precast block materials prepared in examples 1 to 6 and the alkali-activated precast block materials prepared in comparative examples 1 to 3 were tested by using a universal pressure tester in the test, and the results are shown in table 1.
TABLE 1 compressive Strength of alkali-activated precast block materials prepared in examples 1 to 6 of the present invention and comparative examples 1 to 3
Figure BDA0002992206020000091
Traditionally, the compressive strength of the prefabricated block material is obviously reduced along with the increase of the mixing amount of the clay brick powder. By the excitation of the alkali-exciting agent and the regulation and control of the grain composition of the fly ash and the dolomite micro powder, the utilization rate of the clay brick powder can be improved, and the mechanical property of the alkali-excited prefabricated block material is not obviously adversely affected.
For example, the amount of clay brick powder added in examples 1 to 3 was gradually increased from 23.5% to 36.7% (the increase of the amount was more than 13%), and it can be seen from the data in table 1 that the 7d compressive strength of the alkali-activated precast block materials prepared in examples 1 to 3 according to the present invention was slightly increased without a significant decrease in the 28d strength, wherein the 28d strength of example 2 was even higher than the 28d strength of examples 1 and 2. The main reason is that the 28d strength is generated as a result of the best matching between the clay brick micro powder and the composite alkali activator in example 2, and the synergistic effect of the clay brick micro powder and the composite alkali activator improves the activity of the clay brick micro powder, so that although the cement mixing amount is lower than that in example 1, the clay brick micro powder activity is higher, and thus example 2 still shows higher 28d strength; however, example 3 further increased the amount of clay brick micropowder added compared to example 2, and also decreased the amount of cement added, so that the 28d strength was decreased compared to example 2. In addition, by combining the regulation of the fly ash and the dolomite micropowder, the fly ash can comprehensively replace 67.19 wt% of cement (see example 3), and still can obtain considerable strength, which fully embodies the comprehensive advantages of the invention.
Example 4 is the use of activated SiO when the chemical composition of the clay brick micropowder is not within the range of clay brick micropowder described in this application2The micro powder regulates the components, the 28d strength of the micro powder can still reach 31.61MPa, and the difference from the 28d compression resistance 32.13MPa in the embodiment 1 is smaller. Meanwhile, example 4 employs active SiO2The micro powder regulates and controls the components of the clay brick powder, and the active SiO is2Micro powder is compared with SiO contained in clay brick2The activity was higher, so that the early strength (7d strength) of example 4 was higher, but as hydration progressedThe development of 28d strength was gradually reduced compared to example 1 with the same chemical composition.
Example 5 is the recycled clay brick micro powder, when the amount of the added dolomite is more, the 28d compressive strength can reach 32.5MPa, and the performance is only inferior to that of example 2, the main reason is that the amount of the added recycled clay brick micro powder in example 5 is less, and when the amount of the added dolomite is more, the content of 42.5 ordinary portland cement is increased, so the strength is higher. However, the increase of the amount of the 42.5 Portland cement added causes the cost of the prefabricated block material to increase.
The main difference between example 6 and examples 1-5 is that the strength of the alkali-activated precast block material gradually decreases with the increase of the water addition amount, and the water content in example 6 is 35 wt%, and the 28d compressive strength is only 30.5 MPa. Although the strength can be improved by reducing the amount of water, as in examples 1 to 5, the amount of water added is 32%, but further reduction of the amount of water causes a reduction in fluidity during mixing, which affects the construction.
Comparative examples 1 to 3 are different from example 1 only in that the ratios of calcium oxide and sodium hydroxide in the compound alkali activator used are different, and the ratios in comparative examples 1 to 3 are 1:1, 2:1 and 6:1, respectively, covering the case where the ratio of calcium oxide to sodium hydroxide in the compound alkali activator is too low or too high. From the aspect of mechanical properties, when the weight ratio of calcium oxide to sodium hydroxide in the composite alkali activator is too high or too low (i.e. the weight ratio of calcium oxide to sodium hydroxide is not in the range of 3-5), the 28d compressive strength of the composite alkali activator is seriously reduced, so that the service requirement of the alkali-activated prefabricated block material is difficult to meet.
In the foregoing embodiments, the descriptions of the respective embodiments have respective emphasis, and for parts that are not described in detail in a certain embodiment, reference may be made to related descriptions of other embodiments.
The recitation of numerical ranges herein includes all numbers subsumed within that range and includes any two numbers subsumed within that range. Different values of the same index appearing in all embodiments of the invention can be combined arbitrarily to form a range value.
The features of the invention claimed and/or described in the specification may be combined, and are not limited to the combinations set forth in the claims by the recitations therein. The technical solutions obtained by combining the technical features in the claims and/or the specification also belong to the scope of the present invention.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the present invention in any way, and any simple modification, equivalent change and modification made to the above embodiment according to the technical spirit of the present invention are still within the scope of the technical solution of the present invention.

Claims (10)

1. The alkali-activated regenerated clay brick powder cementing material is characterized by comprising a component A and a component B; the component A comprises the following components in parts by weight: 10-25 parts of clay brick powder; 3-7 parts of dolomite micro powder; 15-17 parts of fly ash; 42.5 parts of 18-41 parts of ordinary portland cement; 50-75 parts of fine sand; the component B comprises the following components: 1-4 parts of a composite excitant.
2. The alkali-activated regenerated clay brick powder cementing material as claimed in claim 1, wherein the specific surface area of the clay brick powder is 1600-1700m2/kg。
3. The alkali-activated regenerated clay brick powder cementing material of claim 2, wherein the clay brick powder comprises the following components by weight percent: SiO 22 60％～70％；Al2O3 15％～30％；Fe2O3 4％～6％；CaO 3％～5％；K2O and Na2O 1％～3％。
4. The alkali-activated recycled clay brick powder cementing material as claimed in claim 1, wherein the specific surface area of the dolomite micro powder is 1400-1500 m2/kg。
5. The alkali-activated recycled clay brick powder cementing material of claim 1, wherein the fly ash is secondary fly ash, and the sieve residue of the fly ash passing through a 45 μm square mesh sieve is 20-25%; the fineness modulus of the fine sand is 1.6-2.2.
6. The alkali-activated regenerated clay brick powder cementing material of claim 1, wherein the composite activator comprises calcium oxide and sodium hydroxide in a weight ratio of 3: 1-5: 1.
7. A method for preparing the alkali-activated regenerated clay brick powder cementing material of any one of the claims 1 to 6, which is characterized by comprising the following steps:
s1a, weighing clay brick powder, dolomite micro powder, fly ash, 42.5 common portland cement and fine sand according to the formula ratio, and uniformly mixing to obtain a component A;
s2a, weighing the compound excitant with the formula amount to obtain the component B.
8. A preparation method of an alkali-activated prefabricated block material is characterized by comprising the following steps:
S1B, weighing 32-35 parts by weight of water and 1-4 parts by weight of the component B of the alkali-activated recycled clay brick powder cementing material according to any one of claims 1-6, pouring the component B into the component A, and stirring for 2-4 min at the speed of 100-120 r/min to obtain uniform slurry;
and S2b, forming and maintaining the slurry obtained in the step S1b to obtain the alkali-activated precast block material.
9. The method for preparing an alkali-activated precast block material according to claim 8, wherein in step S2b, the temperature of the molding is 20 ℃ ± 5 ℃, the humidity is 90-95%, and the time is 24 h; the curing temperature is 20 +/-5 ℃, and the curing time is 7 days or 28 days when the humidity is 90-95%.
10. An alkali-activated precast block material having a 7d compressive strength of 10.0 to 12.5MPa and a 28d compressive strength of 30 to 33.0MPa, which is prepared by the method of claim 8 or 9.
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