CN116102281B - Method for quickly preparing high-activity mixed material at low temperature by utilizing shield drying soil and high-activity mixed material prepared by method and application of high-activity mixed material - Google Patents

Method for quickly preparing high-activity mixed material at low temperature by utilizing shield drying soil and high-activity mixed material prepared by method and application of high-activity mixed material Download PDF

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CN116102281B
CN116102281B CN202211444926.0A CN202211444926A CN116102281B CN 116102281 B CN116102281 B CN 116102281B CN 202211444926 A CN202211444926 A CN 202211444926A CN 116102281 B CN116102281 B CN 116102281B
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mixed material
activity
activity mixed
drying soil
shield
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CN116102281A (en
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周楠
宋飞
李耕
梁家荣
赵宏伟
刘欢
刘清泉
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Hunan University of Science and Technology
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    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B40/00—Processes, in general, for influencing or modifying the properties of mortars, concrete or artificial stone compositions, e.g. their setting or hardening ability
    • C04B40/0028—Aspects relating to the mixing step of the mortar preparation
    • C04B40/0039—Premixtures of ingredients
    • C04B40/0046—Premixtures of ingredients characterised by their processing, e.g. sequence of mixing the ingredients when preparing the premixtures
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B20/00—Use of materials as fillers for mortars, concrete or artificial stone according to more than one of groups C04B14/00 - C04B18/00 and characterised by shape or grain distribution; Treatment of materials according to more than one of the groups C04B14/00 - C04B18/00 specially adapted to enhance their filling properties in mortars, concrete or artificial stone; Expanding or defibrillating materials
    • C04B20/02—Treatment
    • C04B20/04—Heat treatment
    • 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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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Ceramic Engineering (AREA)
  • Materials Engineering (AREA)
  • Structural Engineering (AREA)
  • Organic Chemistry (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Curing Cements, Concrete, And Artificial Stone (AREA)

Abstract

The invention discloses a method for quickly preparing a high-activity mixed material at low temperature by utilizing shield drying soil, and the prepared high-activity mixed material and application thereof, and belongs to the technical field of building materials. The method comprises the steps of uniformly mixing a small amount of sodium hydroxide, calcium hydroxide and shield drying soil, and calcining at the temperature of less than or equal to 700 ℃ after high-pressure briquetting, so that the surface of the shield drying soil mineral is activated, defects are generated, and the high-activity mixed material can be prepared with a certain latent hydraulic property. The invention rapidly prepares the high-activity cement and concrete mixture at low temperature, not only can save energy and reduce emission, change waste into valuables and treat shield drying soil in a recycling way, but also can meet the huge demand of the cement and concrete mixture market.

Description

Method for quickly preparing high-activity mixed material at low temperature by utilizing shield drying soil and high-activity mixed material prepared by method and application of high-activity mixed material
Technical Field
The invention relates to the technical field of building materials, in particular to a method for quickly preparing a high-activity mixed material at a low temperature by utilizing shield drying soil, the prepared high-activity mixed material and application thereof.
Background
Shield slag soil generated in subway construction is decomposed into sand aggregates and desiccated soil after proper treatment. The sand aggregates are further used for concrete aggregates through screening and concentration, so that the sand aggregates are applied to various building engineering, and the recycling of wastes is realized. However, the current recycling way of the desiccated soil mainly focuses on baking-free bricks, composite ceramsite and regenerated planting soil, and large-scale continuous utilization of the shield desiccated soil cannot be realized. The massive piled up desiccated soil not only occupies land resources, but also is easy to cause geological hazard and environmental pollution due to improper disposal. Therefore, how to properly treat shield slag soil and realize large-scale and continuous digestion of desiccated soil has become a problem to be solved in the subway tunnel industry.
The method is remarkable in that the 2021 cement yield in China is 23.63 hundred million tons, the consumption of the mixed materials is up to several hundred million tons, the mixed material yield is insufficient in many cities, even part of concrete mixing stations are facing the situation that no mixed materials are available, and the market of massive cement and concrete provides a new idea for recycling the dried soil. The patent with publication number CN106336134A discloses a preparation method of a little clinker cement, which adopts 4-12% of alkali salt to excite siliceous raw material activity at 600-1200 ℃, but the higher alkali content not only promotes the production cost, but also can easily cause the too high alkali content in cement concrete as a mixed material to further deteriorate the mechanical property. The publication number is: the patent of CN103755167A discloses a method for preparing a mixed material by using 0-5.6% sodium carbonate or sodium hydroxide to calcine at 300-750 ℃ for 2-3 hours to prepare burnt soil, and mixing 10-30% of lime or gypsum by mass fraction into the burnt soil to prepare the mixed material with qualified activity, wherein the weathered tuff itself contains more volcanic glass, which is the main reason why the tuff has volcanic ash activity. Hao Tong et al first verified the feasibility of preparing cement admixture with shield muck and found that the shield dry soil calcined at 800 ℃ met the compressive strength ratio requirement of the secondary fly ash (Hao Tong et al, feasibility study of preparing cement admixture with shield muck, silicate report, 2019). But has the following problems: (1) the calcination temperature of the drying soil is higher, the heat preservation time is longer, the production cost is increased sharply, and the application feasibility is reduced; (2) the activity of the calcined shield slag soil is not high, and a proper amount of gypsum and the like are added as an exciting agent in the using process, so that the industrial production cost and difficulty are further increased.
Disclosure of Invention
Aiming at the problem that a large amount of drying soil cannot be effectively treated and recycled in the prior art, the invention provides a high-activity mixed material prepared by a method for rapidly preparing the high-activity mixed material at low temperature by utilizing shield drying soil and application thereof. Quartz and clay minerals in shield drying soil are fully considered, and the surface of the mineral particles of the drying soil is activated by adopting a very small amount of sodium hydroxide and calcium hydroxide in a complex mode, namely, the surface structure of each mineral in the shield drying soil after calcination is modified, so that the surface of the drying soil is rapidly enabled to have potential hydraulic property under the conditions of low temperature, low alkali and low calcium.
The invention provides a method for rapidly preparing a high-activity mixed material at low temperature by using shield drying soil, which adopts a small amount of sodium hydroxide and calcium hydroxide to promote the surface of the drying soil mineral to generate defects in the calcination process, even partially form calcium silicate, further activate a surface structure and have certain latent hydraulic property, and comprises the following steps:
s1, preparing raw materials: adding sodium hydroxide and calcium hydroxide into the dried shield drying soil, mixing tap water accounting for 15-20% of the mass of the shield drying soil, mixing and grinding, and drying to obtain powdery raw materials;
wherein the mass percentages of sodium hydroxide and calcium hydroxide in the powdery raw material are respectively 0.02-0.10wt% and 0.02-0.20wt%;
s2, high-pressure molding of raw materials: pressing the powdery raw material into a block under the condition of more than or equal to 50 MPa;
s3, low-temperature rapid calcination of the material block: calcining the material blocks in a high-temperature furnace at 550-700 ℃ until the surface activation of minerals is completed, and quenching to obtain blocky clinker;
s4, grinding clinker: and grinding the blocky clinker to obtain the high-activity mixed material.
Preferably, in step S1, the sodium hydroxide includes sodium oxide having equal mass of sodium, and the calcium hydroxide includes calcium oxide having equal mass of calcium.
Preferably, in step S1, the mass fractions of sodium hydroxide and calcium hydroxide in the powdery raw meal are 0.04-0.10wt% and 0.04-0.20wt%, respectively.
Preferably, in step S1, the specific surface area of the powdery raw material is 210-290m 2 /kg。
Preferably, in step S3, the calcination is performed for 30 to 60 minutes.
Preferably, in step S3, the rapid cooling is air cooling of an electric fan; preferably, the rotation speed of the electric fan is not lower than 300 rpm.
Preferably, in step S4, the specific surface area of the high-activity mixed material is 350-450m 2 /kg。
The invention also provides the high-activity mixed material prepared by the method for rapidly preparing the high-activity mixed material at low temperature by using the shield drying soil.
The invention also provides application of the mixed material in the field of cement and concrete preparation.
According to the method, the shield drying soil is used for activating the drying soil structure by means of a small amount of sodium hydroxide and calcium hydroxide in the shield drying soil calcination process, so that defects are generated on the surface of the drying soil minerals, even calcium silicate is locally generated, and potential hydraulic property is further obtained. The latent hydraulic property can be further changed by controlling preparation process parameters (fineness of raw materials/sodium hydroxide, calcium hydroxide amount/thermal system and the like) and specific surface area of mixed materials and the like, so that the actual application requirements are met, and the slurry structure can be densified in cooperation with other hydration products. The reaction process is as follows:
first, a small amount of alkali metal activates the clay particle and quartz particle surfaces during calcination; secondly, a small amount of calcium element reacts on the surface of the quartz particles in a solid phase under the action of alkali metal (for example, a very small amount of liquid phase is generated), so that minerals such as calcium silicate with hydration activity are formed. In addition, the invention also adopts a method of carrying out high-pressure briquetting on the dried soil before calcination so as to promote the surface activation reaction. Finally, the dried soil particles with the surface activity can undergo secondary hydration reaction under the excitation of cement hydration products, densify and harden the slurry structure, and improve the mechanical properties of cement and concrete.
The technical scheme of the invention has the following advantages:
1. the invention creatively designs a method for quickly preparing a high-activity mixed material at low temperature by utilizing shield drying soil. Further, the activity regulation and control of the desiccated soil (the activity index is 75% -92.7%) can be realized by adjusting the preparation process parameters (raw material fineness/sodium hydroxide and calcium hydroxide amount/thermal system and the like) so as to meet different requirements of cement and concrete industries.
2. The sodium element is used as a good fluxing agent, can form a small amount of liquid phase by combining other elements during high-temperature calcination, reduces the calcination temperature, and realizes energy conservation, emission reduction, cost reduction and synergy. In addition, sodium ions can form more defects on the surface of the dried soil particles, promote calcium ions and the surfaces of minerals such as quartz to generate solid-phase reaction, form calcium silicate with hydration activity and the like, and cooperatively activate the surface structure of the dried soil to obtain the mixed material with high activity.
3. The method can not only utilize the shield drying soil in a recycling way, but also has wide prospect for comprehensively utilizing the alkali-containing or calcium-containing waste as the activating raw material, can change the alkali-containing or calcium-containing waste into valuable, and is favorable for promoting the green sustainable development of related industries.
4. Compared with the prior art, the invention provides a new idea for preparing the high-activity dried soil mixture, and the technical means not only has the advantages of low calcination temperature, short calcination time, low doping amount of the activating materials (sodium hydroxide and calcium hydroxide), easy realization of the technical route and good activity effect. The invention has important significance for recycling and large-scale utilization of the desiccated soil and alkali-containing or calcium-containing waste.
Detailed Description
The technical scheme of the invention is further described by specific examples and comparative examples. The chemical composition of the shield drying soil is shown in table 1, and the main composition is quartz and clay minerals. The other reagents and instruments involved in the invention are all common commercial products.
TABLE 1 chemical composition of shield drying soil (wt%)
Chemical formula SiO 2 Al 2 O 3 Fe 3 O 4 K 2 O MgO TiO 2 CaO Na 2 O Others
Mass fraction 60.69 23.32 8.29 2.94 2.24 1.22 0.48 0.26 0.56
Example 1
According to the mass fraction of 0.02% of sodium hydroxide and 0.02% of calcium hydroxide added into the powdery raw material, 999.6g of dried soil, 0.2 g of sodium hydroxide, 0.2 g of calcium hydroxide and 149.9g of water are taken, mixed and ground to the specific surface area of 290m 2 Per kg, pressing the dried powdery raw material into blocks under 100MPa, and calcining at 550deg.C for 60 minAnd (3) a clock until the surface activation of the dried soil mineral is completed. The clinker is obtained by cooling to room temperature at a rate of 400 rpm using an electric fan. Grinding the clinker until the specific surface area is 450m 2 And/kg, to obtain a high-activity mixed material. The standard cement for testing the performance of the concrete admixture is adopted, and the activity index of the mixture is tested according to the GB/T12957-2005 standard, and the results are shown in Table 2, and the activity index is good.
Example 2
According to the mass fraction of 0.04 percent of sodium hydroxide and 0.06 percent of calcium hydroxide added into the powdery raw material, 999.0g of dried soil, 0.3 g of sodium oxide, 0.6 g of calcium hydroxide and 199.8g of water are taken, mixed and ground to the specific surface area of 270m 2 And (3) per kg, pressing the dried powdery raw material into a block at 100MPa, and placing the block into a high-temperature furnace for calcining at 550 ℃ for 50 minutes until the surface activation of the dried soil mineral is completed. The clinker is cooled to room temperature at a rate of 550 rpm by means of an electric fan. Grinding the clinker until the specific surface area is 400m 2 And/kg, to obtain a high-activity mixed material. The standard cement for testing the performance of the concrete admixture is adopted, and the activity index of the mixture is tested according to the GB/T12957-2005 standard, and the results are shown in Table 2, and the activity index is good.
Example 3
According to the mass fraction of 0.10 percent of sodium hydroxide and 0.20 percent of calcium hydroxide added into the powdery raw material, 997.0g of dried soil, 1.0 g of sodium hydroxide, 1.5 g of calcium oxide and 179.5g of water are taken, mixed and ground to the specific surface area of 210m 2 And (3) per kg, pressing the dried powdery raw material into a block at 75MPa, and placing the block into a high-temperature furnace for calcining at 550 ℃ for 40 minutes until the surface activation of the dried soil mineral is completed. The clinker is obtained by cooling to room temperature at a rate of 400 rpm using an electric fan. Grinding the clinker until the specific surface area is 350m 2 And/kg, to obtain a high-activity mixed material. The standard cement for testing the performance of the concrete admixture is adopted, and the activity index of the mixture is tested according to the GB/T12957-2005 standard, and the results are shown in Table 2, and the activity index is good.
Example 4
According to the mass percent of 0.02 percent of sodium hydroxide and 0.04 percent of calcium hydroxide in the powdery raw material999.4g of drying soil, 0.2 g of sodium hydroxide, 0.4 g of calcium hydroxide and 149.9g of water are taken, mixed and ground to a specific surface area of 250m 2 And (3) per kg, pressing the dried powdery raw material into a block at 100MPa, and placing the block into a high-temperature furnace for calcination at 600 ℃ for 50 minutes until the surface activation of the dried soil mineral is completed. The clinker is cooled to room temperature at a rate of 550 rpm by means of an electric fan. Grinding the clinker until the specific surface area is 450m 2 And/kg, to obtain a high-activity mixed material. The standard cement for testing the performance of the concrete admixture is adopted, the activity index of the mixed material is tested according to the GB/T12957-2005 standard, and the result is shown in Table 2, and the activity index is higher.
Example 5
According to the mass fraction of 0.04 percent of sodium hydroxide and 0.2 percent of calcium hydroxide added into the powdery raw material, 997.6g of dried soil, 0.3 g of sodium oxide, 1.5 g of calcium oxide and 179.6g of water are taken, mixed and ground to the specific surface area of 290m 2 And (3) per kg, pressing the dried powdery raw material into a block at 100MPa, and placing the block into a high-temperature furnace for calcining at 600 ℃ for 40 minutes until the surface activation of the dried soil mineral is completed. The clinker is cooled to room temperature at a rate of 550 rpm by means of an electric fan. Grinding the clinker until the specific surface area is 400m 2 And/kg, to obtain a high-activity mixed material. The standard cement for testing the performance of the concrete admixture is adopted, the activity index of the mixed material is tested according to the GB/T12957-2005 standard, and the result is shown in Table 2, and the activity index is higher.
Example 6
According to the mass fraction of 0.10 percent of sodium hydroxide, the mass fraction of 0.10 percent of calcium hydroxide, 998.0g of dried soil, 1.0 g of sodium hydroxide, 1.0 g of calcium hydroxide and 149.7g of water added into the powdery raw material are mixed and ground to the specific surface area of 220m 2 And (3) per kg, pressing the dried powdery raw material into a block at 75MPa, and placing the block into a high-temperature furnace for calcining at 600 ℃ for 30 minutes until the surface activation of the dried soil mineral is completed. The clinker is cooled to room temperature at a rate of 550 rpm by means of an electric fan. Grinding the clinker until the specific surface area is 380m 2 And/kg, to obtain a high-activity mixed material. Adopts the standard cement for the performance test of the concrete admixture and detects the activity of the mixture according to the GB/T12957-2005 standardThe index, results are shown in Table 2, with higher activity index.
Example 7
According to the mass fraction of 0.02 percent of sodium hydroxide and 0.06 percent of calcium hydroxide added into the powdery raw material, 999.2g of dried soil, 0.2 g of sodium hydroxide, 0.6 g of calcium hydroxide and 199.8g of water are taken, mixed and ground to the specific surface area of 250m 2 And (3) per kg, pressing the dried powdery raw material into a block at 100MPa, and placing the block into a high-temperature furnace for calcining at 700 ℃ for 50 minutes until the surface activation of the dried soil mineral is completed. The clinker is obtained by cooling to room temperature at a rate of 400 rpm using an electric fan. Grinding the clinker until the specific surface area is 420m 2 And/kg, to obtain a high-activity mixed material. The standard cement for testing the performance of the concrete admixture is adopted, and the activity index of the mixture is tested according to the GB/T12957-2005 standard, and the result is shown in Table 2, and the activity index is very high.
Example 8
According to the mass fraction of 0.06 percent of sodium hydroxide, the mass fraction of 0.20 percent of calcium hydroxide, 997.4g of dried soil, 0.6 g of sodium hydroxide, 2.0 g of calcium hydroxide and 159.6g of water are taken, mixed and ground to the specific surface area of 230m 2 And (3) per kg, pressing the dried powdery raw material into a block at 75MPa, and placing the block into a high-temperature furnace to calcine at 700 ℃ for 40 minutes until the surface activation of the dried soil mineral is completed. The clinker is cooled to room temperature at a rate of 550 rpm by means of an electric fan. Grinding the clinker until the specific surface area is 380m 2 And/kg, to obtain a high-activity mixed material. The standard cement for testing the performance of the concrete admixture is adopted, and the activity index of the mixture is tested according to the GB/T12957-2005 standard, and the result is shown in Table 2, and the activity index is very high.
Example 9
According to the mass fraction of 0.10 percent of sodium hydroxide and 0.04 percent of calcium hydroxide added into the powdery raw material, 998.9g of dried soil, 0.8 g of sodium hydroxide, 0.3 g of calcium hydroxide and 169.8g of water are taken, mixed and ground to the specific surface area of 250m 2 And (3) per kg, pressing the dried powdery raw material into a block at 50MPa, and placing the block into a high-temperature furnace for calcining at 700 ℃ for 30 minutes until the surface activation of the dried soil mineral is completed. At 400 rpm using an electric fanCooling to room temperature at the rate of clock to obtain clinker. Grinding the clinker until the specific surface area is 350m 2 And/kg, to obtain a high-activity mixed material. The standard cement for testing the performance of the concrete admixture is adopted, and the activity index of the mixture is tested according to the GB/T12957-2005 standard, and the result is shown in Table 2, and the activity index is very high.
Comparative example 1
1000.0g of dry soil and 200.0g of water are taken, mixed and ground until the specific surface area is 290m 2 And/kg, pressing the dried powdery raw material into a block at 100MPa, and placing the block into a high-temperature furnace to calcine at 600 ℃ for 50 minutes. The clinker is cooled to room temperature at a rate of 550 rpm by means of an electric fan. Grinding the clinker until the specific surface area is 450m 2 And/kg, to obtain a mixed material. The standard cement for testing the performance of the concrete admixture is adopted, and the activity index of the mixture is tested according to the GB/T12957-2005 standard, and the result is shown in Table 2, and the activity index is not qualified (< 65%).
Comparative example 2
According to the mass fraction of 0.02% of sodium hydroxide added into the powdery raw material, 999.8g of drying soil, 0.2 g of sodium hydroxide and 160.0g of water are taken, mixed and ground to a specific surface area of 220m 2 And (3) per kg, pressing the dried powdery raw material into a block at 75MPa, and placing the block into a high-temperature furnace for calcination at 600 ℃ for 50 minutes until the surface activation of the dried soil mineral is completed. The clinker is obtained by cooling to room temperature at a rate of 400 rpm using an electric fan. Grinding the clinker until the specific surface area is 400m 2 And/kg, to obtain a mixed material. The standard cement for testing the performance of the concrete admixture is adopted, and the activity index of the mixture is tested according to the GB/T12957-2005 standard, and the result is shown in Table 2, and the activity index is not qualified (< 65%).
Comparative example 3
According to the mass fraction of 0.02% of the calcium hydroxide added into the powdery raw material, 999.8g of drying soil, 0.2 g of calcium hydroxide and 160.0g of water are taken, mixed and ground to 260m of specific surface area 2 And (3) per kg, pressing the dried powdery raw material into a block at 75MPa, and placing the block into a high-temperature furnace for calcination at 600 ℃ for 50 minutes until the surface activation of the dried soil mineral is completed. The clinker is cooled to room temperature at a rate of 550 rpm by means of an electric fan. Grinding powderClinker to a specific surface area of 450m 2 And/kg, to obtain a mixed material. The standard cement for testing the performance of the concrete admixture is adopted, and the activity index of the mixture is tested according to the GB/T12957-2005 standard, and the result is shown in Table 2, and the activity index is not qualified (< 65%).
Comparative example 4
According to the mass fraction of 0.01 percent of sodium hydroxide and 0.01 percent of calcium hydroxide added into the powdery raw material, 999.8g of dried soil, 0.1 g of sodium hydroxide, 0.1 g of calcium hydroxide and 160.0g of water are taken, mixed and ground to the specific surface area of 290m 2 And (3) per kg, pressing the dried powdery raw material into a block at 75MPa, and placing the block into a high-temperature furnace for calcination at 600 ℃ for 50 minutes until the surface activation of the dried soil mineral is completed. The clinker is obtained by cooling to room temperature at a rate of 400 rpm using an electric fan. Grinding the clinker until the specific surface area is 400m 2 And/kg, to obtain a mixed material. The standard cement for testing the performance of the concrete admixture is adopted, and the activity index of the mixture is tested according to the GB/T12957-2005 standard, and the result is shown in Table 2, and the activity index is not qualified (< 65%).
Comparative example 5
According to the mass fraction of 0.2 percent of sodium hydroxide and 0.4 percent of calcium hydroxide added into the powdery raw material, 994.0g of dried soil, 2.0 g of sodium hydroxide, 4.0g of calcium hydroxide and 160.0g of water are taken, mixed and ground to the specific surface area of 280m 2 And (3) per kg, pressing the dried powdery raw material into a block at 75MPa, and placing the block into a high-temperature furnace for calcination at 600 ℃ for 50 minutes until the surface activation of the dried soil mineral is completed. The clinker is cooled to room temperature at a rate of 550 rpm by means of an electric fan. Grinding the clinker until the specific surface area is 350m 2 And/kg, to obtain a mixed material. The standard cement for testing the performance of the concrete admixture is adopted, and the activity index of the mixture is tested according to the GB/T12957-2005 standard, and the result is shown in Table 2, and the activity index is not qualified (< 65%).
Comparative example 6
Mixing 999.2g of dried soil, 0.4 g of sodium hydroxide, 0.4 g of calcium hydroxide and 160.0g of water according to the mass fraction of 0.04% of sodium hydroxide and the mass fraction of 0.04% of calcium hydroxide in the powdery raw material, and grinding to a specific surface area220m 2 And (3) per kg, pressing the dried powdery raw material into a block under 75MPa, and placing the block into a high-temperature furnace to be calcined at 400 ℃ for 60 minutes for surface activation treatment. The clinker is cooled to room temperature at a rate of 550 rpm by means of an electric fan. Grinding the clinker until the specific surface area is 400m 2 And/kg, to obtain a mixed material. The standard cement for testing the performance of the concrete admixture is adopted, and the activity index of the mixture is tested according to the GB/T12957-2005 standard, and the result is shown in Table 2, and the activity index is not qualified (< 65%).
Comparative example 7
According to the mass fraction of 0.04 percent of sodium hydroxide and 0.04 percent of calcium hydroxide added into the powdery raw material, 999.2g of dried soil, 0.4 g of sodium hydroxide, 0.4 g of calcium hydroxide and 160.0g of water are taken, mixed and ground to the specific surface area of 220m 2 And (3) per kg, pressing the dried powdery raw material into a block at 75MPa, and placing the block into a high-temperature furnace for calcining at 800 ℃ for 50 minutes until the surface activation of the dried soil mineral is completed. The clinker is cooled to room temperature at a rate of 550 rpm by means of an electric fan. Grinding the clinker until the specific surface area is 350m 2 And/kg, to obtain a high-activity mixed material. The standard cement for testing the performance of the concrete admixture is adopted, and the activity index of the mixture is tested according to the GB/T12957-2005 standard, and the result is shown in Table 2, and the activity index is not high.
Comparative example 8
According to the mass fraction of 0.04 percent of sodium hydroxide, the mass fraction of 0.20 percent of calcium hydroxide, 997.6g of dried soil, 0.4 g of sodium hydroxide, 2.0 g of calcium hydroxide and 160.0g of water are taken, mixed and ground to the specific surface area of 210m 2 And/kg, pressing the dried powdery raw material into a block at 20MPa, and placing the block into a high-temperature furnace for calcination at 600 ℃ for 60 minutes. The clinker is cooled to room temperature at a rate of 550 rpm by means of an electric fan. Grinding the clinker until the specific surface area is 350m 2 And/kg, to obtain a mixed material. The standard cement for testing the performance of the concrete admixture is adopted, and the activity index of the mixture is tested according to the GB/T12957-2005 standard, and the result is shown in Table 2, and the activity index is not qualified (< 65%).
Comparative example 9
According to the addition of powdered raw materialsMixing 997.6g of dried soil, 0.4 g of sodium hydroxide, 2.0 g of calcium hydroxide and 160.0g of water, and grinding until the specific surface area is 220m 2 And (3) per kg, pressing the dried powdery raw material into a block under 75MPa, placing the block into a high-temperature furnace, calcining at 700 ℃ for 180 minutes, and performing long-time drying soil mineral surface activation. The clinker is cooled to room temperature at a rate of 550 rpm by means of an electric fan. Grinding the clinker until the specific surface area is 350m 2 And/kg, to obtain a mixed material. The standard cement for testing the performance of the concrete admixture is adopted, and the activity index of the mixture is tested according to the GB/T12957-2005 standard, and the result is shown in Table 2, and the activity index is not high.
Comparative example 10
According to the mass fraction of 0.04 percent of sodium hydroxide, the mass fraction of 0.20 percent of calcium hydroxide, 997.6g of dried soil, 0.4 g of sodium hydroxide, 2.0 g of calcium hydroxide and 160.0g of water are taken, mixed and ground to the specific surface area of 220m 2 And (3) per kg, pressing the dried powdery raw material into a block at 75MPa, and placing the block into a high-temperature furnace to be calcined at 700 ℃ for 10 minutes for surface activation. The clinker is cooled to room temperature at a rate of 550 rpm by means of an electric fan. Grinding the clinker until the specific surface area is 350m 2 And/kg, to obtain a mixed material. The standard cement for testing the performance of the concrete admixture is adopted, and the activity index of the mixture is tested according to the GB/T12957-2005 standard, and the result is shown in Table 2, and the activity index is not qualified (< 65%).
Table 2: activity index of the products of comparative examples and examples
As is clear from Table 2, a small amount of sodium hydroxide and calcium hydroxide added in the process of calcining the dried soil activates the surfaces of the mineral particles of the dried soil, so that more defective and active minerals are formed, and the dried soil has a certain latent hydraulic property. The surface of the dried soil subjected to heat treatment has more activation points, and the basic cement is hydrated to generate a large amount of calcium hydroxide (alkalinity) to better excite each activation point to latent hydraulic property, so that secondary hydration reaction occurs to form hydrated calcium aluminosilicate products. The product formed on the surface of the dried soil mineral particles promotes the tight combination of the dried soil mineral particles and cement hydration products, so that a compact slurry structure is constructed together, and the improvement of mechanical properties is facilitated. Further, the surface activity characteristics of the dried soil mixture can be changed by controlling preparation process parameters (raw material fineness/alkali amount/thermal system and the like) and the specific surface area of the mixture, so that the dried soil mixture with different activity indexes can be prepared to match actual application requirements. As is clear from comparative example 1, the shield drying soil directly calcined activity index is not qualified (< 65%), which indicates that the active products are very few. As is clear from comparative examples 2 to 3, the activation effect of singly blended sodium hydroxide or calcium hydroxide is poor, indicating that there is a synergistic effect between the two. As is clear from comparative examples 4 to 5, the concentration of the sodium hydroxide or the calcium hydroxide blended too high or too low, the activation effect is poor, which means that the mineral surface structure cannot be activated effectively due to the low concentration, and the free alkali or calcium oxide remained after the surface activation is caused by the too high concentration, thereby deteriorating the cement performance. As is evident from comparative examples 6-7, too low a calcination temperature would not qualify the activity index, too high a calcination temperature would instead decrease the activity index, probably because a low temperature would not effectively activate the mineral surface structure, while too high a temperature would easily result in "passivation" of the surface active structure. As is evident from comparative example 8, too low a molding pressure results in an unacceptable activity index because the loose structure is detrimental to the surface activation reaction. As can be seen from comparative examples 9-10, the calcination time was too short and the surface activation was not completed, resulting in unacceptable activity index. However, prolonged calcination times are not conducive to an increase in the activity index, since the activation reaction proceeds predominantly at the surface, whereas excessively long calcination times may lead to "passivation" of the surface-active structure.
Finally, it should be noted that the above-mentioned embodiments are only for illustrating the technical solution of the present invention and not for limiting the scope of the present invention, and although the present invention has been described in detail with reference to the different embodiments, it should be understood by those skilled in the art that modifications or equivalent substitutions can be made to the technical solution of the present invention without departing from the spirit and scope of the technical solution of the present invention.

Claims (8)

1. The method for preparing the high-activity mixed material quickly at low temperature by using the shield drying soil is characterized in that sodium hydroxide and calcium hydroxide are adopted, the shield drying soil is doped for quick calcination by a high-pressure block, and then the surface structure of the mineral of the shield drying soil is activated, so that the high-activity mixed material is prepared, and the method comprises the following steps:
s1, preparing raw materials: adding sodium hydroxide and calcium hydroxide into the dried shield drying soil, mixing tap water accounting for 15-20% of the mass of the shield drying soil, mixing and grinding, and drying to obtain powdery raw materials;
wherein the mass percentages of sodium hydroxide and calcium hydroxide in the powdery raw material are respectively 0.02-0.10wt% and 0.02-0.20wt%;
s2, high-pressure molding of raw materials: pressing the powdery raw material into a block under the condition of more than or equal to 50 MPa;
s3, low-temperature rapid calcination of the material block: calcining the material block in a high temperature furnace at 550-700 ℃ for 30-60 minutes until the surface activation of the minerals is completed, and quenching to obtain blocky clinker;
s4, grinding clinker: and grinding the blocky clinker to obtain the high-activity mixed material.
2. The method for quickly preparing the high-activity mixed material at low temperature by using the shield drying soil according to claim 1, which is characterized in that: in step S1, the sodium hydroxide may be replaced with sodium oxide having equal mass of sodium, and the calcium hydroxide may be replaced with calcium oxide having equal mass of calcium.
3. The method for quickly preparing the high-activity mixed material at low temperature by using the shield drying soil according to claim 1, which is characterized in that: in the step S1, the mass fractions of the sodium hydroxide and the calcium hydroxide in the powdery raw material are respectively 0.04-0.10wt% and 0.04-0.20wt%.
4. The method for quickly preparing the high-activity mixed material at low temperature by using the shield drying soil according to claim 1, which is characterized in that: in step S1, the specific surface area of the powdery raw material is 210-290m 2 /kg。
5. The method for quickly preparing the high-activity mixed material at low temperature by using the shield drying soil according to claim 1, which is characterized in that: in step S3, the rapid cooling is electric fan air cooling; the rotating speed of the electric fan is not lower than 300 revolutions per minute.
6. The method for quickly preparing the high-activity mixed material at low temperature by using the shield drying soil according to claim 1, which is characterized in that: in the step S4, the specific surface area of the high-activity mixed material is 350-450 m 2 /kg。
7. The high-activity mixed material prepared by the method for rapidly preparing the high-activity mixed material at a low temperature by using shield drying soil according to any one of claims 1 to 6.
8. The use of the admixture of claim 7 in the field of cement and concrete preparation.
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CN111847924A (en) * 2020-08-04 2020-10-30 武汉大学 Tailing-based cementing material and preparation method thereof
CN113264700A (en) * 2021-05-25 2021-08-17 深圳市和盛环保科技有限公司 Regenerated cementing material based on subway shield sludge
CN115029113A (en) * 2022-05-09 2022-09-09 北京建筑材料科学研究总院有限公司 Premixed shield grouting material, shield grouting slurry and application thereof
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CN1546410A (en) * 2003-12-01 2004-11-17 同济大学 Composite cement with large amount of coal gangue and its preparation method
CN101125739A (en) * 2006-08-15 2008-02-20 中国石油天然气集团公司 High-activity alkali ore slag fly ash inorganic polymer gel material and manufacturing method thereof
WO2015035386A1 (en) * 2013-09-09 2015-03-12 Halliburton Energy Services, Inc. Cement set activators for cement compositions and associated methods
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