CN112079583A - Building material product based on rapid carbonization of regenerated cementing material and preparation method thereof - Google Patents

Building material product based on rapid carbonization of regenerated cementing material and preparation method thereof Download PDF

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Publication number
CN112079583A
CN112079583A CN202010868522.9A CN202010868522A CN112079583A CN 112079583 A CN112079583 A CN 112079583A CN 202010868522 A CN202010868522 A CN 202010868522A CN 112079583 A CN112079583 A CN 112079583A
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regenerated
powder
cementing material
building material
product based
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Inventor
何永佳
汪鹏
吕林女
陈雪菲
刘志超
王发洲
胡曙光
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Wuhan University of Technology WUT
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Wuhan University of Technology WUT
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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
    • C04B7/246—Cements from oil shales, residues or waste other than slag from waste building materials, e.g. waste asbestos-cement products, demolition waste
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B28—WORKING CEMENT, CLAY, OR STONE
    • B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
    • B28B11/00—Apparatus or processes for treating or working the shaped or preshaped articles
    • B28B11/24—Apparatus or processes for treating or working the shaped or preshaped articles for curing, setting or hardening
    • B28B11/245—Curing concrete articles
    • 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
    • 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

Abstract

The invention discloses a building material product based on rapid carbonization of a regenerated cementing material and a preparation method thereof. The preparation method comprises the following steps: collecting dust and fine particles generated in the crushing and separating processes of the waste concrete, and grinding the dust and the fine particles into powder; homogenizing the powder, calcining for 2-3 h at 900-1100 ℃, cooling, grinding again and homogenizing again to obtain a regenerated cementing material; uniformly mixing the regenerated cementing material with water, and pressing and forming to obtain a product green body; and carbonizing the green product blank to obtain the building material product quickly carbonized based on the regenerated cementing material. According to the invention, the waste concrete is subjected to calcination treatment through the powder obtained by crushing and separating, and then is subjected to carbonization treatment after compression molding, so that the obtained regenerated product has high strength and low f-CaO content, and the problems of low strength and adverse influence of high f-CaO content on the durability of the product when the regenerated cementing material prepared from the waste concrete is used as a cementing material or a concrete admixture are solved.

Description

Building material product based on rapid carbonization of regenerated cementing material and preparation method thereof
Technical Field
The invention relates to the technical field of building materials, in particular to a building material product based on rapid carbonization of a regenerated cementing material and a preparation method thereof.
Background
Along with the transformation and construction of urban and rural infrastructures, a large amount of old house buildings and old engineering structures are dismantled and rebuilt every year in China, and a large amount of construction waste is generated. The most important component of the construction waste is waste concrete, and the main disposal method is open-air stacking or landfill at present. However, the treatment methods have the problems of land occupation, ecological damage, environmental pollution, resource waste and the like. In fact, the waste concrete mainly comprises aggregate and cement paste, researchers have separated coarse aggregate after crushing the waste concrete to be used as regenerated aggregate, but a large amount of cement stone powder generated by stripping and crushing in the treatment process is not efficiently recycled and reused, the environment is polluted after landfill and disposal, the cement stone is the most environmentally-loaded component in the waste concrete, and a large amount of resources and energy are consumed in the production process of the cement, so that the regeneration and recycling of the cement stone component in the waste concrete are of great significance.
Chinese patent CN200510019050.5 discloses a method for preparing a regenerated cementing material by using waste concrete, which is to separate coarse aggregate from mortar in the waste concrete, grind the mortar and then calcine the ground mortar at 400-900 ℃ to prepare the regenerated cementing material with the ability of re-hydration and hardening. However, the regenerated cementitious materials used alone or as concrete admixtures still have some problems: firstly, the gelling capacity is low, the strength of a product prepared by using the product alone is low, and the product can only be applied to occasions with low requirements on physical and mechanical properties; secondly, in regeneration of gellingDuring the process of material calcination preparation, the hydration products C-S-H gel in the cement stone, Ca (OH)2The mineral phases are decomposed to generate more f-CaO, which has adverse effects on the durability performances of the regenerated cementing material products and the concrete doped with the regenerated cementing material, such as sulfate corrosion resistance, water corrosion resistance and the like.
Disclosure of Invention
The invention aims to overcome the technical defects, provides a building material product based on rapid carbonization of a regenerated cementing material and a preparation method thereof, and solves the technical problems that the strength of the product is insufficient after regeneration of waste concrete powder, the f-CaO content is high, and the durability is influenced in the prior art.
In order to achieve the technical purpose, the invention provides a method for preparing a building material product based on rapid carbonization of a regenerated cementing material, which comprises the following steps:
collecting dust and fine particles generated in the process of crushing and separating recycled aggregate from components of waste concrete, and grinding the dust and fine particles into powder with the specific Bosch surface area of more than or equal to 300m2Powder of/kg;
the specific Boehringer's surface area is more than or equal to 300m2Homogenizing/kg powder, calcining at 900-1100 ℃ for 2-3 h, cooling, grinding again and homogenizing again to obtain a regenerated cementing material; after the above-mentioned secondary grinding, the Boehringer specific surface area of calcined powder body is greater than or equal to 300m2/kg；
Uniformly mixing the regenerated cementing material with water, and pressing and forming to obtain a product green body;
and curing the product green blank in a carbon dioxide atmosphere to obtain the building material product quickly carbonized based on the regenerated cementing material.
In a second aspect of the invention, a building material product based on rapid carbonization of a regenerated cementitious material is provided, which is obtained by the method for producing a building material product based on rapid carbonization of a regenerated cementitious material according to the first aspect of the invention.
Compared with the prior art, the invention has the beneficial effects that:
according to the invention, the waste concrete is crushed and separated to obtain powder, the powder is calcined to obtain the regenerated cementing material, and the powder is pressed and molded and then carbonized to obtain the regenerated product with high strength and low f-CaO content, so that the application technical problem that the regenerated cementing material prepared from the waste concrete has low strength and high f-CaO content when used as a cementing material or a concrete admixture and has adverse effect on the durability of the product is solved.
Drawings
FIG. 1 is a process flow diagram of one embodiment of a method of making a building material product based on rapid carbonization of a reclaimed cementitious material in accordance with the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Referring to fig. 1, in a first aspect, the present invention provides a method for preparing a building material product based on rapid carbonization of a regenerated cementitious material, comprising the steps of:
s1: collecting dust and fine particles generated in the process of crushing and separating recycled aggregate from components of waste concrete, and grinding the dust and fine particles into powder with the specific Bosch surface area of more than or equal to 300m2Powder (hereinafter referred to as ground powder) of/kg. In the step, the used waste concrete is produced by demolition after the service life is reached or due to town transformation, new construction and the like, and does not contain reinforcing steel bars, glass slag, wood and the like; the obtained Boehringer specific surface area is more than or equal to 300m2The main components of the powder per kg are hydration products of cement, cement clinker which is partially not completely hydrated, and a small amount of coarse and fine aggregate powder. Specifically, the Boehringer's specific surface area is not less than 300m2The powder/kg comprises the following components in percentage by mass: 83-88% of cement stone powder, 9-11% of quartz sand powder and 3-8% of limestone powder. Further, the Boehringer's specific surface area is not less than 300m2The powder/kg comprises the following main chemical components in percentage by mass: CaO: 45 to 65 percent; SiO 22：20％～35％；Al2O3：4％～6％；Fe2O3: 1% -3%; MgO: 1 to 2 percent. Further, the pulverized powder has a Brinell specific surface area of 300-420 m2Kg, further 300 to 400m2/kg。
S2: the specific Boehringer's surface area is more than or equal to 300m2Homogenizing/kg powder, calcining at 900-1100 ℃ for 2-3 h, then quenching to room temperature by wind power, and grinding and homogenizing again to obtain the regenerated cementing material. In the step, the homogenization process is carried out in a mixer, the calcination process is carried out in an oxidizing atmosphere furnace, the temperature rise rate is 5-10 ℃/min, and after the secondary grinding, the Bosch specific surface area of the calcined powder is more than or equal to 300m2In terms of/kg. Further, the sintered powder has a Boehringer specific surface area of 300-450 m2Kg, further 300 to 400m2In terms of/kg. The preferable heating rate is 6-9 ℃/min, the calcination temperature is 950-1100 ℃, and the calcination time is 2-3 h. In the invention, the calcination temperature is controlled within the range, so that more high-carbonization active minerals can be obtained, and the strength of the product is improved; on the other hand, the method is favorable for reducing the calcining energy consumption.
S3: and uniformly mixing the regenerated cementing material and water according to a water-solid ratio of 0.15-0.25, and pressing and molding the mixed material under 10-20 MPa to obtain a product green body. In this embodiment, the resulting green product is in the form of a plate or other shape and has a thickness dimension of less than 10 cm.
S4: and curing the product green blank in a carbon dioxide atmosphere to obtain the building material product quickly carbonized based on the regenerated cementing material. In the step, the carbonization process is carried out in a pressure-resistant closed container, which can be a steel pressure kettle with a pressure gauge, a gas pressure regulating valve, an openable sealing cover and the like; the concentration (volume percentage) of carbon dioxide is 95-99.9%, the partial pressure of carbon dioxide gas is 0.1-0.4 MPa, and the curing time is 8-24 h; wherein the volume percentage of CO used is 95-99.9%2Is prepared by mixing commercially available CO with 99.9% purity2Mixing the gas and air; CO 22The gas partial pressure is adjusted by using a gas pressure regulating valve.
In the present invention, the specific surface area of the powder is determined byGrinding to 300m2More than kg, the mechanical property of the building material product based on the rapid carbonization of the regenerated cementing material can be improved; further controlling the specific surface area of the calcined powder to be 300-450 m2And/kg, on one hand, the energy consumption can be prevented from being increased due to excessive grinding, and on the other hand, the mechanical property is prevented from being reduced due to the influence on the maintenance effect caused by the excessive fineness of the powder.
The invention can obtain a large amount of beta-C with high carbonization activity by calcining2S、γ-C2S and other mineral phases, and products with high compressive strength can be prepared by carbonization in a short time; the invention controls the specific surface area of the regenerated cementing material to ensure that the regenerated cementing material has good carbonization activity, avoids overhigh grinding energy consumption and avoids being unfavorable for CO when the powder is too fine2The gas enters the inside of the blank body to influence the carbonization and maintenance effect; the invention converts the f-CaO in the regenerated cementing material into CaCO through carbonization and maintenance3The method fundamentally solves the adverse effect on the durability of the product, provides a new idea for realizing the resource utilization of the regenerated cementing material, and is beneficial to developing green building materials.
In a second aspect of the invention, a building material product based on rapid carbonization of a regenerated cementitious material is provided, which is obtained by the method for producing a building material product based on rapid carbonization of a regenerated cementitious material according to the first aspect of the invention.
In the following embodiments and comparative examples of the invention, the compressive strength of the obtained product is characterized in that the compressive strength of three cylindrical samples with the size of phi 20 multiplied by 20mm, which are taken out from the drill core of the product, are respectively loaded to be destroyed by a press at 2.4kN/s by taking two end surfaces of each cylindrical test block as stress surfaces, the compressive strength of a single sample is obtained by dividing the destructive load by the stress area, and the average value of the compressive strengths of the three samples is taken as the compressive strength of the product; the f-CaO content of the obtained product is obtained by respectively crushing and grinding three cylindrical samples obtained by core drilling into powder which is sieved by a 200-mesh sieve, and averaging after the f-CaO content is obtained by referring to the test of the glycerol-ethanol method of GB/T176-2008.
Example 1
The embodiment provides a method for preparing a building material product based on rapid carbonization of a regenerated cementing material, which comprises the following steps:
(1) collecting dust and fine particles generated in the process of crushing and separating recycled aggregate from components of waste concrete, and grinding the dust and fine particles into powder with the specific Bosch surface area of 300m by using a grinding machine2Powder of/kg; in the step, the used waste concrete is obtained after a bridge pier column is dismantled, powder separated from the waste concrete is collected and ground, and the content of the cement stone powder is 88%, the content of the quartz sand powder is 9% and the content of the limestone powder is 3% through detection.
(2) The above Boehringer's specific surface area was set to 300m2Homogenizing/kg powder with a mixer, feeding the powder into an oxidizing atmosphere furnace, uniformly heating to 950 ℃ at a speed of 5 ℃/min, keeping the temperature for 3h, rapidly cooling to room temperature by wind power, and grinding again until the Boehringer specific surface area reaches 320m2And/kg, and then homogenizing by using a mixer again to obtain the regenerated cementing material, wherein the f-CaO content of the regenerated cementing material is 3.2 percent.
(3) And uniformly mixing the regenerated cementing material and water according to the water-solid ratio of 0.2, and pressing and molding the mixed material under 10MPa to obtain a product green body. In this step, the obtained green product was in the form of a plate having a size of 30cm × 30cm × 5 cm.
(4) Placing the above product green body in a pressure-resistant closed container, and adding CO at 98% concentration and 0.3MPa2Maintaining for 12h under the partial pressure of gas to obtain the building material product based on the rapid carbonization of the regenerated cementing material.
After the steps are completed, the building material product which is quickly carbonized based on the regenerated cementing material and has the plate shape is obtained, the f-CaO content is 0.7 percent, and the compressive strength is 61.3 MPa.
Example 2
The embodiment provides a method for preparing a building material product based on rapid carbonization of a regenerated cementing material, which comprises the following steps:
(1) collecting dust and fine particles generated in the process of crushing and separating recycled aggregate from components of waste concrete, and grinding the dust and fine particles into powder with the specific Bosch surface area of 300m by using a grinding machine2Powder of/kg; in the step, the used waste concrete is obtained after a bridge pier column is dismantled, collected and ground, and the waste concrete is mixed from the waste concreteThe detection shows that the content of the cement stone powder is 88 percent, the content of the quartz sand powder is 9 percent and the content of the limestone powder is 3 percent.
(2) The above Boehringer's specific surface area was set to 300m2Homogenizing/kg powder with a mixer, feeding the powder into an oxidizing atmosphere furnace, uniformly heating to 1100 deg.C at 5 deg.C/min, keeping the temperature for 3h, rapidly cooling to room temperature by wind power, and grinding again until the Boehringer specific surface area reaches 380m2And/kg, and then homogenizing by using a mixer again to obtain the regenerated cementing material, wherein the f-CaO content of the regenerated cementing material is 1.6 percent.
(3) And uniformly mixing the regenerated cementing material and water according to the water-solid ratio of 0.2, and pressing and molding the mixed material under 10MPa to obtain a product green body. In this step, the obtained green product was in the form of a plate having a size of 30cm × 30cm × 5 cm.
(4) Placing the above product green body in a pressure-resistant closed container, and adding CO at 98% concentration and 0.3MPa2Maintaining for 12h under the partial pressure of gas to obtain the building material product based on the rapid carbonization of the regenerated cementing material.
After the steps are completed, the platy building material product based on the rapid carbonization of the regenerated cementing material is obtained, the f-CaO content is 0.2 percent, and the compressive strength is 108 MPa.
Example 3
The embodiment provides a method for preparing a building material product based on rapid carbonization of a regenerated cementing material, which comprises the following steps:
(1) collecting dust and fine particles generated in the process of crushing and separating recycled aggregate from components of waste concrete, and grinding the dust and fine particles into powder with the specific Bosch surface area of 330m by using a grinding machine2Powder of/kg; in the step, the used waste concrete is obtained after a certain expressway concrete pavement is dismantled, powder separated from the waste concrete is collected and ground, and the content of the cement stone powder is 86 percent, the content of the quartz sand powder is 11 percent and the content of the limestone powder is 3 percent through detection;
(2) the above Boehringer's specific surface area was 330m2Homogenizing/kg powder with a mixer, feeding the powder into an oxidizing atmosphere furnace, uniformly heating to 1100 deg.C at 10 deg.C/min, maintaining for 2.5h, and rapidly cooling to room temperature by wind powerGrinding again until the Bo's specific surface area reaches 340m2And/kg, and then homogenizing by using a mixer again to obtain the regenerated cementing material, wherein the f-CaO content of the regenerated cementing material is 2.2 percent.
(3) And uniformly mixing the regenerated cementing material and water according to the water-solid ratio of 0.15, and pressing and molding the mixed material under 20MPa to obtain a product green body. In this step, the obtained green product was in the form of a plate having a size of 50cm × 50cm × 3 cm.
(4) Placing the above product in a pressure-resistant sealed container, and adding 0.4MPa CO at 95% concentration2And maintaining for 24 hours under the partial pressure of gas to obtain the building material product based on the rapid carbonization of the regenerated cementing material.
After the steps are completed, the platy building material product based on the rapid carbonization of the regenerated cementing material is obtained, the f-CaO content is 0.3 percent, and the compressive strength is 88.4 MPa.
Example 4
The embodiment provides a method for preparing a building material product based on rapid carbonization of a regenerated cementing material, which comprises the following steps:
(1) collecting dust and fine particles generated in the process of crushing and separating recycled aggregate from components of waste concrete, and grinding the dust and fine particles into powder with a Brinell specific surface area of 340m by using a grinding machine2Powder of/kg; in the step, the used waste concrete is obtained after a certain expressway concrete pavement is dismantled, powder separated from the waste concrete is collected and ground, and the content of the cement stone powder is 83 percent, the content of the quartz sand powder is 9 percent and the content of the limestone powder is 8 percent through detection;
(2) the above Boehringer's specific surface area was 340m2Homogenizing/kg powder with a mixer, feeding the powder into an oxidizing atmosphere furnace, uniformly heating to 1000 deg.C at 10 deg.C/min, keeping the temperature for 2.5h, rapidly cooling to room temperature by wind power, and grinding again until the Boehringer specific surface area reaches 340m2And/kg, and then homogenizing by using a mixer again to obtain the regenerated cementing material, wherein the f-CaO content of the regenerated cementing material is 2.6 percent.
(3) And uniformly mixing the regenerated cementing material and water according to the water-solid ratio of 0.25, and pressing and molding the mixed material under 15MPa to obtain a product green body. In this step, the green product obtained was prismatic in the dimensions 50cm × 8cm × 8 cm.
(4) Placing the above product green body in a pressure-resistant closed container, and adding CO at a concentration of 99.9% and a pressure of 0.1MPa2And maintaining for 8 hours under the condition of gas partial pressure to obtain the building material product based on the rapid carbonization of the regenerated cementing material.
After the steps are completed, the prismatic building material product which is quickly carbonized based on the regenerated cementing material is obtained, the f-CaO content is 0.6 percent, and the compressive strength is 80.4 MPa.
Example 5
Example 5 differs from example 1 only in that in example 5 the calcination temperature used was 1100 ℃.
After the steps are completed, the platy building material product based on the rapid carbonization of the regenerated cementing material is obtained, the f-CaO content is 0.1 percent, and the compressive strength is 90.3 MPa.
Example 6
Example 6 differs from example 1 in that in example 6, the ratio of the ground powder is 420m2/kg。
After the steps are completed, the f-CaO content of the obtained building material product is 0.8 percent, and the compressive strength is 63.7 MPa.
Example 7
Example 7 is different from example 1 in that in example 7, the ratio of the calcined powder is 450m2/kg。
After the steps are completed, the f-CaO content of the obtained building material product is 0.3 percent, and the compressive strength is 65 MPa.
Comparative example 1
Comparative example 1 differs from example 1 only in that in comparative example 1, a calcination temperature of 850 ℃ is used.
After the steps are completed, the f-CaO content of the obtained building material product is 1.3 percent, and the compressive strength is 15.6 MPa.
Comparative example 2
Comparative example 2 is different from example 1 in that in comparative example 2, the ratio of the ground powder is 280m2/kg, powder ratio after calcination is 280m2/kg。
After the steps are completed, the f-CaO content of the obtained building material product is 0.8 percent, and the compressive strength is 34.5 MPa.
Comparative example 3
Comparative example 3 differs from example 1 in that in comparative example 3, a calcination soak time of 1 hour was used.
After the steps are completed, the f-CaO content of the obtained building material product is 1.2 percent, and the compressive strength is 43.5 MPa.
Comparative example 4
Comparative example 4 differs from example 1 in that in comparative example 4, the green article was hydrated in an environment of 20 ± 2 ℃ and 95 ± 5% RH for 28 days.
After the steps are completed, the f-CaO content of the obtained building material product is 3.0 percent, and the compressive strength is 1.2 MPa.
Comparative example 5
Comparative example 5 is different from example 1 in that in comparative example 5, the volume concentration of carbon dioxide is 50% and the carbonization time is 24 hours during carbonization.
After the steps are completed, the f-CaO content of the obtained building material product is 1.3 percent, and the compressive strength is 45.7 MPa.
From the above, the building material products based on rapid carbonization of the regenerated cementing materials obtained in the embodiments 1 to 7 of the invention have excellent mechanical properties and durability.
Comparative example 1 has a lower compressive strength and a higher f-CaO content than example 1 because a large amount of highly carbonized active beta-C cannot be obtained with a lower calcination temperature in comparative example 12S、γ-C2S, and the like, are not able to produce a product having high compressive strength in a short time by carbonization. Meanwhile, f-CaO generated by the decomposition of hydrated calcium silicate in the regenerated cementing material is not fully recombined to generate beta-C2S、γ-C2S and other mineral phases with relatively high content.
Comparative example 2 has a lower compressive strength than example 1 because the powder of comparative example 2 has a lower specific surface area, which is not conducive to carbonization and curing, resulting in poor performance.
Comparative example 3 has a lower compressive strength and a higher f-CaO content than example 1The reason for this is that, in comparative example 3, a large amount of highly carbonized active β -C could not be obtained with a shorter calcination time2S、γ-C2S, resulting in a carbonized article having low strength.
Comparative example 4 has a lower compressive strength and a higher f-CaO content than example 1, because the prepared reclaimed cement has a much lower hydration activity than the carbonization activity, and thus the green body of the resulting reclaimed cement is hydrated and the strength of the resulting product is very low.
The comparative example 5 has a lower compressive strength and a higher f-CaO content than example 1 because, in the comparative example 5, a product having a high compressive strength cannot be prepared by carbonization in a short time using a lower concentration of carbon dioxide during carbonization.
Compared with the prior art, the invention has the beneficial effects that:
the building material product based on the rapid carbonization of the regenerated cementing material has excellent mechanical property, the compressive strength of the building material product can reach 60-110 MPa, and the defect of low strength of the regenerated cementing material used as a mixture is overcome;
the method can greatly reduce the f-CaO content in the regenerated cementing material product by a carbonization curing method, and avoids the adverse effect on the durability of the product caused by the method;
the regenerated cementing material prepared by utilizing the waste concrete has low calcination temperature and high carbonization activity, and can solidify a large amount of CO in the carbonization process2The gas has remarkable energy-saving and environment-friendly characteristics;
the invention can realize high value-added utilization of the powder separated from the waste concrete, and further improve the resource utilization rate of the waste concrete.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.

Claims (9)

1. A preparation method of a building material product based on rapid carbonization of a regenerated cementing material is characterized by comprising the following steps:
collecting dust and fine particles generated in the process of crushing and separating recycled aggregate from components of waste concrete, and grinding the dust and fine particles into powder with the specific Bosch surface area of more than or equal to 300m2Powder of/kg;
the specific Boehringer's surface area is more than or equal to 300m2Homogenizing/kg powder, calcining at 900-1100 ℃ for 2-3 h, cooling, grinding again and homogenizing again to obtain a regenerated cementing material; after the regrinding, the Boehn specific surface area of the calcined powder is more than or equal to 300m2/kg；
Uniformly mixing the regenerated cementing material with water, and pressing and forming to obtain a product green body;
and curing the product green blank in a carbon dioxide atmosphere to obtain the building material product quickly carbonized based on the regenerated cementing material.
2. A method for the production of a building material product based on the rapid carbonisation of regenerated cementitious materials according to claim 1, characterised in that the Boehringer specific surface area is not less than 300m2The powder/kg comprises the following components in percentage by mass: 83-88% of cement stone powder, 9-11% of quartz sand powder and 3-8% of limestone powder.
3. The method for preparing a building material product based on rapid carbonization of a regenerated cementing material according to claim 1, characterized in that the temperature rise rate during the calcination process is 5-10 ℃/min.
4. The preparation method of the building material product based on rapid carbonization of the regenerated cementing material according to claim 3, characterized in that the temperature rise rate in the calcination process is 6-9 ℃/min, the calcination temperature is 950-1100 ℃, and the heat preservation time is 2-3 h.
5. The method for preparing a building material product based on rapid carbonization of regenerated gel material according to claim 1, characterized in that the specific surface area of dust and fine particles after grinding is 300-420m2Per kg; after the second grinding, the Bo's specific surface area of the calcined powder is 300-450 m2/kg。
6. A preparation method of a building material product based on rapid carbonization of a regenerated cementing material according to claim 1, characterized in that the water-solid ratio is 0.15-0.25 in the process of uniformly mixing the regenerated cementing material with water.
7. The method for preparing a building material product based on rapid carbonization of a regenerated cementing material according to claim 1, characterized in that the pressure applied in the compression molding process is 10-20 MPa.
8. The method for preparing a building material product based on rapid carbonization of a regenerated cementing material according to claim 1, characterized in that the concentration of carbon dioxide is 95-99.9%, the partial pressure of carbon dioxide gas is 0.1-0.4 MPa, and the curing time is 8-24 h.
9. A building material product based on rapid carbonization of a regenerated cementing material, which is obtained by the method for preparing the building material product based on rapid carbonization of a regenerated cementing material according to any one of claims 1 to 8.
CN202010868522.9A 2020-08-26 2020-08-26 Building material product based on rapid carbonization of regenerated cementing material and preparation method thereof Pending CN112079583A (en)

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