CN115108792B - Carbon-fixing soft soil curing agent and preparation method and application thereof - Google Patents
Carbon-fixing soft soil curing agent and preparation method and application thereof Download PDFInfo
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- CN115108792B CN115108792B CN202210682892.2A CN202210682892A CN115108792B CN 115108792 B CN115108792 B CN 115108792B CN 202210682892 A CN202210682892 A CN 202210682892A CN 115108792 B CN115108792 B CN 115108792B
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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
- C04B28/08—Slag cements
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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
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/00474—Uses not provided for elsewhere in C04B2111/00
- C04B2111/00732—Uses not provided for elsewhere in C04B2111/00 for soil stabilisation
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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
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/00474—Uses not provided for elsewhere in C04B2111/00
- C04B2111/0075—Uses not provided for elsewhere in C04B2111/00 for road construction
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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
- 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
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- 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 relates to a carbon-fixing soft soil curing agent, which comprises the following components in parts by weight: 30-50 parts of blast furnace slag, 5-16 parts of fly ash, 4-15 parts of waste concrete, 8-20 parts of steel slag, 5-16 parts of LF furnace refining slag, 5-10 parts of desulfurized gypsum, 8-15 parts of CaO, 1-2 parts of triethanolamine residue and 1-3 parts of potassium aluminum sulfate dodecahydrate; wherein the triethanolamine residue is solid residue generated in the production process of triethanolamine. The product and the application method of the invention have the series of advantages of low carbon, high carbon fixation and strength development and wide applicability in soft soil reinforcement engineering, not only greatly utilize various solid waste resources, but also realize the effects of low carbon and carbon fixation by adopting innovative CO2 gas maintenance, and have wide application prospect.
Description
Technical Field
The invention relates to the technical field of roadbed construction, in particular to a carbon-fixing soft soil curing agent, a preparation method and application thereof.
Background
The soil curing agent is a novel energy-saving environment-friendly engineering material for curing various kinds of soil. The soil particles tend to agglomerate, are easy to compact and stabilize, thus forming an integral structure and achieving a compaction density which cannot be achieved by the conventional method. The performances of the soil treated by the soil curing agent, such as strength, compactness, rebound modulus, shearing strength and the like, are greatly improved, so that the service life of a road is prolonged, the engineering maintenance cost is saved, and the method has high economic and environmental benefits and is an ideal road building material choice at present.
Along with the acceleration of economic construction, a large amount of solid waste and CO are generated in the production process of engineering construction, steel smelting and chemical industry 2 The gas mainly comprises waste concrete, steel slag, LF furnace refining slag and triethanolamine residues, the utilization rate of the solid wastes is low, and most of the solid wastes are piled up to pollute the environment; while a large amount of CO 2 Is discharged to the atmosphere and is then allowed to pass,causing various environmental problems. How to utilize the solid wastes in the construction engineering and change the wastes into treasures to realize reduction and harmlessness is significant.
However, most of the main raw materials of the soft soil curing agents in the prior published patents and published documents are cement, slag, fly ash and the like, or cement self-hydration hardening reaction is utilized to generate cementing effect; or uses sodium silicate, sodium hydroxide and other substances with strong alkalinity and SiO in slag and fly ash 2 And Al 2 O 3 Physical and chemical reactions such as depolymerization are generated, and substances such as ettringite are generated to generate cementing effect. However, the above-mentioned soft soil curing agents have the following problems: (1) The solid waste related to the material preparation technology system of the existing soft soil curing agent generally relates to steel slag, but waste concrete, LF furnace refining slag and triethanolamine residues are rarely used, and most of the solid waste is not utilized and is piled up, so that the environment is polluted; (2) Most of the existing soft soil curing agents use silicate cement or sulphoaluminate cement and the like as one of cementing materials, and CO cannot be effectively reduced or absorbed 2 A gas; (3) At present, most soft soil curing agents adopt alkali excitation and ettringite to generate cementing effect, but the problems of poor water invasion resistance of the hardened material, alkali return, strength collapse caused by the decomposition and expansion stress of the ettringite at the later stage and the like exist.
Disclosure of Invention
First, the technical problem to be solved
In view of the above technical problems, an object of the present invention is to provide a carbon-fixed soft soil curing agent which not only realizes high value-added utilization of solid wastes such as waste concrete, LF furnace refining slag, triethanolamine residues, etc., but also can absorb and fix a large amount of CO when the soil is hardened by using the soft soil curing agent 2 Carbon emission is reduced, and the comprehensive performance of the hardened soil is excellent through a two-stage cementing principle, so that the problems that the existing soft soil curing agent is insufficient in utilization of solid waste resources and cannot reduce or absorb CO are solved 2 And the technical problems of poor water invasion performance or post strength shrinkage after hardening and the like. The soft soil curing agent can be used for various soft soil curing projects.
(II) technical scheme
In order to achieve the above purpose, the main technical scheme adopted by the invention comprises the following steps:
in a first aspect, the invention provides a carbon-fixing soft soil curing agent, which comprises the following components in parts by weight: 30-50 parts of blast furnace slag, 5-16 parts of fly ash, 4-15 parts of waste concrete, 8-20 parts of steel slag, 5-16 parts of LF furnace refining slag, 5-10 parts of desulfurized gypsum, 8-15 parts of CaO, 1-2 parts of triethanolamine residue and 1-3 parts of potassium aluminum sulfate dodecahydrate; wherein the triethanolamine residue is solid residue generated in the production process of triethanolamine.
According to the preferred embodiment of the invention, the blast furnace slag is prepared by punching through a seal method, and the specification is as follows: the 7d activity index is more than or equal to 80 percent, and the 28d activity index is more than or equal to 105 percent.
According to a preferred embodiment of the invention, the fly ash is secondary or tertiary fly ash produced by a power plant.
According to the preferred embodiment of the invention, the granularity of the waste concrete is less than or equal to 20mm, and the waste concrete does not contain sundries such as reinforcing steel bars and the like.
According to the preferred embodiment of the invention, the granularity of the steel slag is less than or equal to 10mm, and the TFe content is less than or equal to 2%.
According to the preferred embodiment of the invention, the refining granularity of the LF furnace is less than or equal to 20mm, and the TFe content is less than or equal to 2%.
According to the preferred embodiment of the invention, the PH value of the desulfurized gypsum is more than or equal to 6.5, and the calcium sulfite content is less than or equal to 0.4 percent. The desulfurized gypsum is from a power plant.
According to a preferred embodiment of the invention, the CaO is in powder form and has a specific surface area of 400m or more 2 /kg。
According to the preferred embodiment of the invention, the comprehensive specific surface area of the carbon-fixing soft soil curing agent is more than or equal to 400m 2 /kg. Powder with the required particle size and specification is obtained through powder and air separation.
In a second aspect, the invention also relates to a preparation method of the carbon-fixing soft soil curing agent, which comprises the following steps:
s1, mixing and grinding 30-50 parts by weight of blast furnace slag, 5-16 parts by weight of fly ash, 4-15 parts by weight of waste concrete, 8-20 parts by weight of steel slag, 5-16 parts by weight of LF furnace refining slag, 5-10 parts by weight of desulfurized gypsum, 1-2 parts by weight of triethanolamine residue and 1-3 parts by weight of potassium aluminum sulfate dodecahydrate; in the grinding process, hot air is introduced to dry the materials so as to reduce the water content of the powder obtained by grinding;
s2, after the powder is finished, mixing 8-15 parts by weight of CaO powder into the collected powder, and obtaining the carbon-fixing soft soil curing agent (dry powder).
The raw materials such as blast furnace slag, desulfurized gypsum and the like contain certain moisture, so that hot air is introduced in the grinding process to improve the dryness of the materials, facilitate the subsequent powder selection and avoid the reaction of the contained moisture and the subsequently added CaO powder.
According to the preferred embodiment of the invention, in S1, after grinding is finished, the method further comprises the step of selecting powder to select the powder so as to ensure that the specific surface area is more than or equal to 400m 2 And (3) per kg, the free water content is less than or equal to 1%, the powder enters a dust collecting unit for collection under the action of wind power and negative pressure, and the powder collected by the dust collecting unit is used for preparing the carbon-fixing soft soil curing agent.
The water content of the blast furnace slag can reach more than 8%, the water content of the desulfurized gypsum can reach more than 13%, and the water content of the powder prepared by grinding is controlled to be less than or equal to 1% in order to avoid the reaction of CaO and water contained in the desulfurized gypsum, so that the desulfurized gypsum can be mixed with CaO.
According to the preferred embodiment of the invention, in S2, the powder CaO and the powder collected by the dust collecting unit are mixed by a mixer to prepare the carbon-fixing soft soil curing agent for storage.
The invention provides a use method of a carbon-fixing soft soil curing agent, which comprises the following steps:
(1) Mixing and pulping: adding 13-20wt% of carbon-fixing soft soil curing agent into undisturbed soil, adding water to ensure that the water-ash mass ratio is 1.3-1.7, adding a polycarboxylic acid high-efficiency water reducing agent accounting for 0.2-0.3% of the mass of the carbon-fixing soft soil curing agent, and mixing to prepare slurry; (2) curing: injecting the slurry into the filling area, and injecting CO into the slurry in the filling area 2 And (3) gas, so that the slurry is subjected to a curing reaction.
According to a preferred embodiment of the present invention, CO is injected 2 The method for the gas comprises the following steps: at the bottom of the slurry in the filling areaCO 2 Distributor by CO 2 The distributor evenly injects CO into the slurry 2 The gas injection flow rate is controlled to be 10m 3 /h-50m 3 And/h, controlling the pressure to be 0.3-1 Mpa; the CO injection is gradually regulated according to the setting time and consistency of the slurry in the injection process 2 Controlling the flow and pressure of the gas, and controlling the size of bubbles in the slurry to be less than or equal to 0.1mm; simultaneously, CO is pulled upwards every 5-10min 2 Sparger to adjust CO 2 The position of the distributor is such that CO is injected 2 The action of the gas is gradually carried out upwards from the bottom of the slurry.
According to the preferred embodiment of the invention, the technical effect is optimal when the water-cement ratio of the slurry is 1.5, including the optimal consistency of the slurry and the optimal injection of CO 2 And (3) operating the gas, wherein the material performance formed after the slurry is solidified is optimal.
According to a preferred embodiment of the present invention, 5-10% of the water mass of ethanolamine (the mass ratio of ethanolamine in the mixed slurry) is added to increase CO when the slurry is prepared by mixing 2 Solubility in the slurry, quickening the slurry and CO 2 Is a reaction rate of (a).
CO injection 2 CO is added when gas is supplied 2 Gas source and CO 2 Pumping equipment (air pump and pipeline) is connected, CO 2 The pumping device is connected with CO arranged inside the slurry 2 The distributor is connected to inject CO into the slurry 2 Gas by regulating CO 2 Valve element of pumping device for regulating CO 2 Gas pump in pressure and flow. Wherein CO 2 The gas source can be from CO sold in the market 2 Industrial flue gas such as high-pressure gas cylinder or lime kiln, and CO in the flue gas 2 The concentration of (2) is more than or equal to 35 percent. Pressure of injection of industrial flue gas CO according to the foregoing 2 The pressure requirement of the gas is converted.
According to the preferred embodiment of the invention, the CO is injected 2 In the process, the CO in the slurry is homogenized by vibration 2 The gas forms air hole size (less than or equal to 0.1 mm), and the compactness of the slurry is increased. For example, this can be achieved by placing a vibrating device within the slurry.
According to the preferred embodiment of the inventionIn the use process of the carbon-fixing soft soil curing agent, the CaO content in the slurry and the CO injection are controlled in a combined way 2 The speed of the gas is such that the reaction temperature of the slurry is 40-80 ℃.
Since CaO reacts rapidly with water to form Ca (OH) 2 Releasing heat; CO at the same time 2 And Ca (OH) in the slurry 2 The carbonation reaction with calcium silicate to form calcium carbonate crystallites is also exothermic, and thus the solidification reaction of the slurry creates problems of heat build up and temperature rise.
The calcium carbonate microcrystal generated by carbonation and Ca (OH) generated in large quantity in the system 2 The reaction generates basic calcium carbonate (Ca (OH) 2 ·2CaCO 3 ·1.5H 2 O). The formation of calcium carbonate microcrystals and basic calcium carbonate can form overlap joint among particles, strengthen interface strength among particles and strengthen acting force between slurry and soft soil. When the curing reaction temperature of the slurry is in the range of 40-80 ℃, the hydration activity of blast furnace slag, fly ash and steel slag is favorably excited, aluminum potassium sulfate dodecahydrate and desulfurized gypsum are matched to depolymerize the aluminosilicates in the slag and the fly ash to form a cementing product mainly containing ettringite, the ettringite connects particles with the particles and the soft soil, and the stability and strength of the soft soil are enhanced.
(III) beneficial effects
(1) The components of blast furnace slag, fly ash, waste concrete, steel slag, LF furnace refining slag, desulfurized gypsum, triethanolamine residues and the like in the soft soil curing agent belong to industrial solid wastes (respectively belong to metallurgical solid wastes, building material solid wastes and chemical solid wastes), do not contain cement, effectively reduce the product cost of the curing agent (the solid wastes are adopted as main raw materials, the cost is low, and the material cost can be reduced by 10% -20%), and realize the recycling of the industrial solid wastes, energy conservation and emission reduction. The method disclosed by the invention is beneficial to the reduction treatment of industrial solid wastes and has environmental protection significance.
(2) The invention uses triethanolamine residue, caO and aluminum potassium sulfate dodecahydrate as exciting agents, and uses the materials in groutingIn the process, CO is introduced 2 Performing gas curing to generate calcium carbonate microcrystals and basic calcium carbonate, and enhancing the cementing force between particles and soft soil; the calcium carbonate microcrystal produced at the same time interacts with the produced ettringite to produce hydrated calcium carbonate aluminate mineral, stabilizes the ettringite mineral, avoids the transition from the calcium carbonate microcrystal to the AFm (monosulfur hydrated calcium sulfoaluminate) with sheet-shaped non-structural strength, inhibits the problems of strength collapse and the like produced at the later stage, and simultaneously introduces CO 2 The superfine micropores formed by the gas provide a space for the generation of the later ettringite, and reduce the destructive effect of expansion stress.
(3) The invention consumes a large amount of CO in the use process of the soft soil curing agent 2 The gas can reduce carbon and fix carbon, realize carbon fixation and emission reduction of industrial flue gas such as lime kiln and the like, and reduce industrial carbon emission. In the use process of the soft soil curing agent, a secondary cementing theory system is introduced, and CO is creatively adopted in the curing process 2 Gas curing, utilizing calcium hydroxide and silicate gel produced by hydration of waste concrete, steel slag, LF furnace refining slag and CaO, and mixing the calcium hydroxide and silicate gel with CO 2 And carbonation reaction is carried out to achieve the effect of carbon fixation and cementation. Through measurement and calculation, the carbon fixation rate reaches 3% -6%, namely 30-60Kg of carbon can be fixed per ton of the novel low-carbon soft soil curing agent.
Drawings
FIG. 1 is a flow chart of a preparation process of the carbon-fixing soft soil curing agent.
FIG. 2 shows CO introduced into slurry injected into a filling area in a method for using a carbon-fixing soft soil curing agent according to the present invention 2 Schematic of a gas to promote the slurry to complete the curing reaction.
In the figure, 1-filling a filling area of slurry mixed by a carbon-fixing soft soil curing agent and raw soil; 2-Czochralski CO 2 A chain of distributors; 3-CO 2 A gas delivery conduit; 4-CO 2 A distributor.
Detailed Description
The invention is described in detail below in connection with specific embodiments for better understanding of the invention.
The invention provides a novel carbon-fixing soft soil curing agent, which comprises the following components in parts by weight: 30-50 parts of blast furnace slag, 5-16 parts of fly ash, 4-15 parts of waste concrete, 8-20 parts of steel slag, 5-16 parts of LF furnace refining slag, 5-10 parts of desulfurized gypsum, 8-15 parts of CaO, 1-2 parts of triethanolamine residue and 1-3 parts of potassium aluminum sulfate dodecahydrate; wherein the triethanolamine residue is solid residue generated in the production process of triethanolamine.
The preparation flow of the novel carbon-fixing soft soil curing agent is shown in the figure 1.
Firstly, respectively weighing 30-50 parts by weight of blast furnace slag, 5-16 parts by weight of fly ash, 4-15 parts by weight of waste concrete, 8-20 parts by weight of steel slag, 5-16 parts by weight of LF furnace refining slag, 5-10 parts by weight of desulfurized gypsum, 1-2 parts by weight of triethanolamine residues and 1-3 parts by weight of potassium aluminum sulfate dodecahydrate in a metering manner.
After weighing, the materials are sent into a grinding unit for mixed grinding, hot air of a hot blast stove is adopted for drying in the grinding process, the humidity of the materials is reduced, and a small amount of water contained in raw materials such as blast furnace slag, desulfurized gypsum and the like is removed. Powder produced by grinding is subjected to powder selection by a powder selecting unit so as to select powder with specific surface area more than or equal to 400m 2 And (3) per kg, the free water content is less than or equal to 1%, the powder enters a dust collecting unit for collection under the action of wind power and negative pressure, and the powder collected by the dust collecting unit is used for preparing the carbon-fixing soft soil curing agent. Specifically, 8-15 parts by weight of CaO powder is mixed into the powder collected by the dust collecting unit, and the carbon-fixing soft soil curing agent (dry powder) is obtained and stored in a warehouse. Wherein, the water content in the powder obtained by dust collection is controlled to be less than or equal to 1% by the treatment of hot air drying and powder selecting steps, so as to avoid the reaction with the water in the materials when CaO is mixed.
Fig. 2 is a schematic diagram showing a method for using the novel carbon-fixing soft soil curing agent. The application method of the soft soil curing agent comprises two steps, wherein the first step is a slurry mixing step, and the second step is a step of curing and curing by injecting CO2 into the slurry after the mixed slurry is injected into a filling area. The following is described with reference to fig. 2:
(1) Mixing and pulping: adding 13-20wt% of carbon-fixing soft soil curing agent into undisturbed soil, adding water to ensure that the water-ash mass ratio is 1.3-1.7, adding a polycarboxylic acid high-efficiency water reducing agent accounting for 0.2-0.3% of the mass of the carbon-fixing soft soil curing agent, and mixing to obtain slurry.
Wherein the technical effect is optimal when the water-cement ratio of the slurry is 1.5, including the optimal consistency of the slurry and the optimal injection of CO 2 And (3) operating the gas, wherein the material performance formed after the slurry is solidified is optimal.
Preferably, in the mixing to prepare the slurry, 5-10% by mass of ethanolamine (the mass ratio of ethanolamine in the mixed slurry) is added to increase CO 2 Solubility in the slurry, quickening the slurry and CO 2 Is a reaction rate of (a).
(2) Curing: injecting the slurry into the filling area, and injecting CO into the slurry in the filling area 2 And (3) gas, so that the slurry is subjected to a curing reaction.
CO injection 2 The method for the gas comprises the following steps: CO is arranged at the bottom of the slurry in the filling zone 1 2 Distributor 4, by CO 2 The distributor 4 uniformly injects CO into the slurry 2 The gas injection flow rate is controlled to be 10m 3 /h-50m 3 And/h, controlling the pressure to be 0.3-1 Mpa; the CO injection is gradually regulated according to the setting time and consistency of the slurry in the injection process 2 Controlling the flow and pressure of the gas, and controlling the size of bubbles in the slurry to be less than or equal to 0.1mm; at the same time, the connection is used at intervals of 5-10min 2 The chain 2 on the distributor 4 pulls up the CO 2 Distributor 4 to regulate CO 2 The position of the height of the distributor, so that CO is injected 2 The action of the gas is gradually carried out upwards from the bottom of the slurry.
CO injection 2 CO is added when gas is supplied 2 Gas source and CO 2 CO pumped into a plant 2 The gas delivery pipe 3 is connected with CO 2 CO pumped into a plant 2 The gas delivery pipe 3 is in turn connected with CO buried in the slurry 2 The distributor 4 is connected with CO 2 The distributor 4 is provided with a plurality of small air holes for CO 2 The gas has the functions of uniform distribution and refinement. Through the methodCO 2 Sparger 4 to inject CO into slurry interior 2 Gas by regulating CO 2 Valve element of pumping device for regulating CO 2 Gas pump in pressure and flow.
Preferably, a vibrating device can be placed in the slurry, injecting CO 2 In the process, the CO in the slurry is homogenized through the vibration action of the vibration device 2 The gas forms air hole size (less than or equal to 0.1 mm), and the compactness of the slurry is increased. At the same time, control injection of CO 2 The reaction temperature of the slurry is maintained between 40-80 c by the velocity of the gas or by means of external heating or cooling means.
When the temperature of the slurry is in the range of 40-80 ℃, the hydration activity of blast furnace slag, fly ash and steel slag is favorably excited, aluminum potassium sulfate dodecahydrate and desulfurized gypsum are matched to depolymerize the silicon aluminum in the slag and the fly ash, a cementing product mainly containing ettringite is formed, the ettringite is used for connecting particles with soft soil, and the stability and strength of the soft soil are enhanced.
The novel carbon-fixing soft soil curing agent does not use cement and other high-carbon emission and high-energy consumption raw materials, and introduces CO in the process of using the novel low-carbon soft soil curing agent by reasonably collocating solid wastes and adding various reaction reinforcing agents such as triethanolamine residues, desulfurized gypsum, caO and potassium aluminum sulfate dodecahydrate, utilizing the heat released by CaO and water and grouting 2 The carbonation reaction of gas and the alkali excitation reaction of silicon aluminum form a two-stage cementation theoretical system, which is specifically as follows:
namely a primary cementation theory system: caO reacts exothermically with water to form Ca (OH) 2 The temperature of the slurry system is increased. Ca (OH) is provided by waste concrete and LF furnace refining slag 2 And silicate gel (C-S-H), the above raw materials and CO 2 The gas generates severe carbonation exothermic reaction at higher slurry temperature, and at the same time, the temperature of the slurry is further increased to promote the carbonation reaction degree, and the reaction generates the interfacial effect generated by the interdigitation of calcium carbonate microcrystals, so as to wrap and fix clay particles; calcium carbonate microcrystal generated by carbonation at the same time and large in systemCa (OH) produced in quantity 2 The reaction generates basic calcium carbonate (Ca (OH) 2 ·2CaCO 3 ·1.5H 2 O). The formation of calcium carbonate microcrystals and basic calcium carbonate can form the lap joint between particles and strengthen the interfacial strength between particles, and simultaneously introduce CO 2 The gas forms tiny bubbles in the slurry, can be used as a space for the growth of ettringite in a secondary cementing system, avoids the expansion stress damage caused by ettringite, and has the following reaction formula of a primary cementing theoretical system:
CaO+H 2 O→Ca(OH) 2
CO 2 +H 2 O→H 2 CO 3
Ca(OH) 2 +H 2 CO 3 →CaCO 3 +H 2 O
C-S-H+H 2 CO 3 →CaCO 3 +SiO 2 +H 2 O
2CaCO 3 +Ca(OH) 2 +1.5H 2 O→Ca(OH) 2 ·2CaCO 3 ·1.5H 2 O
secondary cementation theory system: silicate minerals in the steel slag are hydrated, silicate gel is generated, and a network structure is formed; the sulfoaluminate, sulfate and the like in the novel low-carbon soft soil curing agent react with the aluminosilicates in slag and fly ash in an excitation way, and the generated ettringite with relatively coarse crystal forms penetrates through the whole space structure to form skeleton reinforcement and stabilization effects. Meanwhile, the high-activity calcium carbonate produced by carbonation reaction reacts with C-A-H in the slurry to generate hydrated calcium carbonate aluminate, and the mineral further stabilizes the structure of ettringite and avoids the transformation from the ettringite to monosulfur hydrated calcium sulfoaluminate, so that the problems of later strength collapse and the like can be avoided. CO introduced into the primary cementing system 2 The gas micropores (less than or equal to 0.1 mm) also provide a certain space for the growth of ettringite, avoid the damage of expansion stress to hardened slurry, and the reaction formula of the secondary cementing theoretical system is as follows:
C 2 S+H 2 O→C-S-H
C-A-H+KAl(SO 4 ) 2 ·12H 2 O+H 2 O→C 3 A·3CaSO 4 ·32H 2 O
C-A-H+CaSO 4 ·2H 2 O+H 2 O→C 3 A·3CaSO 4 ·32H 2 O；
C 3 A·3CaSO 4 ·32H 2 O→C 3 A·CaSO 4 ·12H 2 O+2CaSO 4 ·2H 2 O+8H 2 O
1.5CaCO 3 +2C-A-H+0.5Ca(OH) 2 +22.5H 2 O→C 3 A·0.5CaCO 3 ·0.5Ca(OH) 2 ·11.5H 2 O+C 3 A·CaCO 3 ·11H 2 O
2C 3 A·0.5CaCO 3 ·0.5Ca(OH) 2 ·11.5H 2 O→C 3 A·CaCO 3 ·11H 2 O+C 3 AH 6
3C 3 A·CaSO 4 ·12H 2 O+2CaCO 3 +18H 2 O→2C 3 A·CaCO 3 ·11H2O+C 3 A·3CaSO 4 ·32H 2 O。
the invention creatively introduces a secondary cementing theory system and creatively adopts CO in the curing process 2 Gas curing, utilizing calcium hydroxide and silicate gel produced by hydration of waste concrete, steel slag, LF furnace refining slag and CaO, and mixing the calcium hydroxide and silicate gel with CO 2 And carbonation reaction is carried out to achieve the effect of carbon fixation and cementation. Through measurement and calculation, the carbon fixation rate reaches 3% -6%, namely 30-60Kg of carbon can be fixed per ton of the novel low-carbon soft soil curing agent.
In order to further clarify the technical progress of the present invention and its technical improvements, a description will be made below with reference to specific embodiments and technical effects.
Example 1
The embodiment provides a novel soft soil curing agent and a using method thereof.
The preparation method of the novel soft soil curing agent comprises the following steps: 30 parts by weight of blast furnace slag, 16 parts by weight of fly ash, 10 parts by weight of waste concrete, 15 parts by weight of steel slag, 10 parts by weight of LF furnace refining slag, 8 parts by weight of desulfurized gypsum, 1 part by weight of triethanolamine residue and 2 parts by weight of dodecanolThe potassium sulphoaluminate is conveyed to a grinding unit through a belt after being accurately metered by a metering unit, heat is provided by a hot blast stove unit, grinding and drying of the materials are completed in the grinding unit, the free moisture of the materials is controlled to be less than or equal to 1%, and then the materials pass through a powder selecting unit to select the specific surface area of the materials to be more than or equal to 400m 2 And (3) feeding the qualified powder of/kg into a dust collection unit, continuously feeding the powder with unqualified specific surface area into a grinding unit for grinding, feeding the qualified powder collected by the dust collection unit into a mixing unit, adding 8 parts by weight of CaO powder for mixing to obtain a novel low-carbon soft soil curing agent, feeding the novel low-carbon soft soil curing agent into a finished product warehousing unit through conveying equipment, and finishing preparation to obtain the product of the invention, which is marked as RT-1.
The application method of the novel soft soil curing agent comprises the following steps:
(1) The soft soil curing agent is added according to 13% of the mass of undisturbed soil, the water cement ratio is 1.5, the polycarboxylic acid high-efficiency water reducing agent with the mass ratio of the soft soil curing agent being 0.3% is added, the 8% ethanolamine with the mass ratio of water is added, and the slurry is prepared by mixing and stirring. And injecting the prepared slurry into a filling area through a deep mixing pile or high-pressure jet grouting pile process.
(2) Using CO 2 35% of the required CO 2 The flow rate is controlled to be 50m 3 And/h, controlling the pressure to be 0.86MPa, filling slurry holes punched along the deep mixing pile or the high-pressure jet grouting pile, and introducing CO 2 Gas distributor, gradually upward from bottom of grouting hole, uniformly spraying CO into injected slurry 2 The gas flow of the injected gas is required to be uniform, and the size control requirement of bubbles in the slurry is less than or equal to 0.1mm. At intervals of 10min, the CO is pulled up 2 Distributor for mixing slurry in grouting holes with CO 2 The gas reacts uniformly. Placing a vibration device in the grouting hole, and controlling CO in the slurry through vibration 2 The pore size of the gas is less than or equal to 0.1mm. In this process, caO reacts rapidly with water to form Ca (OH) 2 Releasing heat; CO at the same time 2 And Ca (OH) in the slurry 2 Carbonation reaction with calcium silicate to form calcium carbonate microcrystal, also exothermic reaction, is realized by controlling CaO content in powder and lifting of CO2 distributorSpeed and CO2 injection rate and flow rate, the slurry temperature was controlled at 50 ℃, and the application method was designated RTS-1.
Example 2
The embodiment provides a novel soft soil curing agent and a using method thereof.
The preparation method of the novel soft soil curing agent comprises the following steps: 40 parts by weight of blast furnace slag, 10 parts by weight of fly ash, 8 parts by weight of waste concrete, 9 parts by weight of steel slag, 9 parts by weight of LF furnace refining slag, 8 parts by weight of desulfurized gypsum, 1.5 parts by weight of triethanolamine residue and 2.5 parts by weight of potassium aluminum dodecahydrate are precisely metered by a metering unit, conveyed to a grinding unit through a belt, provided with heat by a hot blast furnace unit, ground and dried in the grinding unit, the free moisture of the material is controlled to be less than or equal to 1%, and then the material is selected by a powder selecting unit, wherein the specific surface area is more than or equal to 400m 2 And (3) feeding the qualified powder of/kg into a dust collection unit, continuously feeding the powder with unqualified specific surface area into a grinding unit for grinding, feeding the qualified powder collected by the dust collection unit into a mixing unit, adding 12 parts by weight of CaO powder for mixing to obtain a novel low-carbon soft soil curing agent, feeding the novel low-carbon soft soil curing agent into a finished product warehousing unit through conveying equipment, and finishing preparation to obtain the product of the invention, which is marked as RT-2.
The application method of the novel soft soil curing agent comprises the following steps:
(1) Adding the soft soil curing agent according to 15% of the mass of undisturbed soil, wherein the water cement ratio is 1.5, adding the polycarboxylic acid high-efficiency water reducing agent with the soft soil curing agent mass ratio of 0.25%, adding the 6% ethanolamine with the water mass ratio, and mixing and stirring to obtain the slurry. And injecting the prepared slurry into a filling area through a deep mixing pile or high-pressure jet grouting pile process.
(2) Using CO 2 70% of the required CO 2 The flow rate is controlled to be 20m 3 And/h, controlling the pressure to be 0.8MPa, filling slurry holes punched along the deep mixing pile or the high-pressure jet grouting pile, and introducing CO 2 Gas distributor, gradually upward from bottom of grouting hole, uniformly spraying CO into injected slurry 2 The gas flow of the injected gas is required to be uniform, and the size of bubbles in the slurry is controlledThe preparation requirement is less than or equal to 0.1mm. At intervals of 8min, the CO is pulled up 2 Distributor for mixing slurry in grouting holes with CO 2 The gas reacts uniformly. Placing a vibration device in the grouting hole, and controlling CO in the slurry through vibration 2 The pore size of the gas is less than or equal to 0.1mm. In the process, the temperature of the slurry is controlled to be 60 ℃ by controlling the CaO content in the powder, the lifting speed of a CO2 distributor and the spraying speed and flow of CO2, and the application method is marked as RTS-2.
Example 3
The embodiment provides a novel soft soil curing agent and a using method thereof.
The preparation method of the novel soft soil curing agent comprises the following steps: 50 parts by weight of blast furnace slag, 6 parts by weight of fly ash, 4 parts by weight of waste concrete, 8 parts by weight of steel slag, 6 parts by weight of LF furnace refining slag, 8 parts by weight of desulfurized gypsum, 1.5 parts by weight of triethanolamine residue and 2.5 parts by weight of potassium aluminum dodecahydrate are precisely metered by a metering unit, conveyed to a grinding unit through a belt, provided with heat by a hot blast furnace unit, ground and dried in the grinding unit, the free moisture of the material is controlled to be less than or equal to 1%, and then the material is selected by a powder selecting unit, wherein the specific surface area is more than or equal to 400m 2 And (3) feeding the qualified powder of/kg into a dust collection unit, continuously feeding the powder with unqualified specific surface area into a grinding unit for grinding, feeding the qualified powder collected by the dust collection unit into a mixing unit, adding 14 parts by weight of CaO powder for mixing to obtain a novel low-carbon soft soil curing agent, feeding the novel low-carbon soft soil curing agent into a finished product warehousing unit through conveying equipment, and finishing preparation to obtain the product of the invention, which is marked as RT-3.
The application method of the novel soft soil curing agent comprises the following steps:
(1) The soft soil curing agent is added according to 20% of the mass of undisturbed soil, the water cement ratio is 1.5, the polycarboxylic acid high-efficiency water reducing agent with the soft soil curing agent mass ratio of 0.25% is added, the 6% ethanolamine with the water mass ratio is added, and the slurry is prepared by mixing and stirring. And injecting the prepared slurry into a filling area through a deep mixing pile or high-pressure jet grouting pile process.
(2) Using CO 2 90% of the required CO 2 The flow rate is controlled to be 10m 3 And/h, controlling the pressure to be 0.8MPa, filling slurry holes punched along the deep mixing pile or the high-pressure jet grouting pile, and introducing CO 2 Gas distributor, gradually upward from bottom of grouting hole, uniformly spraying CO into injected slurry 2 The gas flow of the injected gas is required to be uniform, and the size control requirement of bubbles in the slurry is less than or equal to 0.1mm. At intervals of 5min, the CO is pulled up 2 Distributor for mixing slurry in grouting holes with CO 2 The gas reacts uniformly. Placing a vibration device in the grouting hole, and controlling CO in the slurry through vibration 2 The pore size of the gas is less than or equal to 0.1mm. In the process, the temperature of the slurry is controlled to 80 ℃ by controlling the CaO content in the powder, the lifting speed of the CO2 distributor and the spraying speed and flow of CO2, and the application method is marked as RTS-3.
Example 4
The embodiment provides a novel soft soil curing agent and a using method thereof.
The preparation method of the novel soft soil curing agent comprises the following steps: 50 parts by weight of blast furnace slag, 5 parts by weight of fly ash, 4 parts by weight of waste concrete, 8 parts by weight of steel slag, 6 parts by weight of LF furnace refining slag, 8 parts by weight of desulfurized gypsum, 2 parts by weight of triethanolamine residues and 3 parts by weight of potassium aluminum dodecahydrate are precisely metered by a metering unit, conveyed to a grinding unit through a belt, provided with heat by a hot blast furnace unit, ground and dried in the grinding unit, the free moisture of the materials is controlled to be less than or equal to 1%, and then the materials are selected by a powder selecting unit, wherein the specific surface area is more than or equal to 400m 2 And (3) feeding the qualified powder of/kg into a dust collection unit, continuously feeding the powder with unqualified specific surface area into a grinding unit for grinding, feeding the qualified powder collected by the dust collection unit into a mixing unit, adding 14 parts by weight of CaO powder for mixing to obtain a novel low-carbon soft soil curing agent, feeding the novel low-carbon soft soil curing agent into a finished product warehousing unit through conveying equipment, and finishing preparation to obtain the product of the invention, which is marked as RT-4.
The application method of the novel soft soil curing agent comprises the following steps:
(1) The soft soil curing agent is added according to 20% of the mass of undisturbed soil, the water cement ratio is 1.5, the polycarboxylic acid high-efficiency water reducing agent with the soft soil curing agent mass ratio of 0.25% is added, the 6% ethanolamine with the water mass ratio is added, and the slurry is prepared by mixing and stirring. And injecting the prepared slurry into a filling area through a deep mixing pile or high-pressure jet grouting pile process.
(2) Using CO 2 99% of the required CO 2 The flow rate is controlled to be 8m 3 And/h, controlling the pressure to be 0.8MPa, filling slurry holes punched along the deep mixing pile or the high-pressure jet grouting pile, and introducing CO 2 Gas distributor, gradually upward from bottom of grouting hole, uniformly spraying CO into injected slurry 2 The gas flow of the injected gas is required to be uniform, and the size control requirement of bubbles in the slurry is less than or equal to 0.1mm. At intervals of 5min, the CO is pulled up 2 Distributor for mixing slurry in grouting holes with CO 2 The gas reacts uniformly. Placing a vibration device in the grouting hole, and controlling CO in the slurry through vibration 2 The pore size of the gas is less than or equal to 0.1mm. In the process, the temperature of the slurry is controlled to 80 ℃ by controlling the CaO content in the powder, the lifting speed of the CO2 distributor and the spraying speed and flow of CO2, and the application method is marked as RTS-4.
Example 5
The composition and preparation method of the soft soil curing agent in this example are the same as those of example 1. Only the water-cement ratio was changed when the slurry was mixed: adding the soft soil curing agent according to 13% of the mass of undisturbed soil, wherein the water-cement ratio is 1.7, adding the polycarboxylic acid high-efficiency water reducing agent with the soft soil curing agent mass ratio of 0.3%, adding 8% of ethanolamine with the water mass ratio, and mixing and stirring to obtain the slurry. And injecting the prepared slurry into a filling area through a deep mixing pile or high-pressure jet grouting pile process. The curing method is described in example 1. The method of use of this example is designated RTS-5.
Example 6
The composition and preparation method of the soft soil curing agent in this example are the same as those of example 1. Only the water-cement ratio was changed when the slurry was mixed: adding the soft soil curing agent according to 13% of the mass of undisturbed soil, wherein the water-cement ratio is 1.3, adding the polycarboxylic acid high-efficiency water reducing agent with the soft soil curing agent mass ratio of 0.3%, adding 8% of ethanolamine with the water mass ratio, and mixing and stirring to obtain the slurry. And injecting the prepared slurry into a filling area through a deep mixing pile or high-pressure jet grouting pile process. The curing method is described in example 1. The method of use of this example is designated RTS-6.
Example 7
The composition and preparation method of the soft soil curing agent in this example are the same as those of example 1. Except that no ethanolamine was added when the slurry was mixed using a soft soil hardener. Adding the soft soil curing agent according to 13% of the mass of undisturbed soil, wherein the water-cement ratio is 1.5, adding the polycarboxylic acid high-efficiency water reducer with the soft soil curing agent mass ratio of 0.3%, and mixing and stirring to obtain the slurry. And injecting the prepared slurry into a filling area through a deep mixing pile or high-pressure jet grouting pile process. The method of use of this example is designated RTS-7.
Example 8
The composition and preparation method of the soft soil curing agent in this example are the same as those of example 1. The method of mixing the slurry was the same as in example 1 except that the lifting speed of the CO2 distributor and the spraying rate and flow rate of CO2 were not controlled during the curing process, the temperature of the slurry was less than 40 ℃, and other conditions were the same as in example 1. The method of use of this example is designated RTS-8.
In order to clearly define the performance characteristics of the product and the application product, PO42.5 cement is used as a comparison sample, and the performance of the product of the embodiment is examined from the soft soil curing effect.
Three kinds of silt soft soil are taken, and the characteristics of the three kinds of silt soft soil are shown in table 1.
TABLE 1 Properties of three kinds of silt soft soil
| Sequence number | Initial moisture content/% | Liquid limit/% | Plastic limit/% | Organic matter content/% |
| Soft soil 1 | 58.5 | 57.2 | 23.4 | 2.4 |
| Soft soil 2 | 60.3 | 59.4 | 22.8 | 1.9 |
| Soft soil 3 | 57.8 | 55.6 | 21.9 | 2.6 |
Conventional use and curing were performed using PO42.5 cement, and products RT-1, RT-2, RT-3 and RT-4 and corresponding application methods RTS-1, RTS-2, RTS-3 and RTS-4 were molded into cubic test molds (filled areas) of 70.7mm×70.7mm×70.7mm according to the above four examples, and the test pieces were cured under a standard curing system after being disassembled, and compressive strength was tested at 3d, 7d and 28d, and the results are shown in Table 2.
Table 2 example products and application methods compare with cement reinforcing effect on three kinds of muddy soft soil
As can be seen from table 2, the products of the examples and the corresponding application methods (CO 2 gas curing) have good reinforcing effects on three kinds of silt soft soil, and are superior to those of cement.
In addition, according to the application methods RTS-1, RTS-5, RTS-6, RTS-7 and RTS-8 of the product RT-1 of example 1, respectively, under different conditions, a test piece was subjected to curing under a standard curing system after being removed from a cubic test mold (filling area) of 70.7mm×70.7mm×70.7mm, and compressive strength test was performed at 3d, 7d and 28d, and the results are shown in Table 3.
Table 3 shows a comparison of the reinforcing effect of the product of example 1 on three kinds of muddy soft soil when used by the application method
In summary, the product and the application method of the invention have the series of advantages of low carbon, high carbon fixation and strength development and wide applicability in soft soil reinforcement engineering, and the invention not only largely utilizes various solid waste resources, but also adopts innovative CO2 gas maintenance, thereby realizing the effects of low carbon and carbon fixation and having wide application prospect. In addition, in the use process of the soft soil curing agent, the water-cement ratio is controlled to be 1.5, and the finally displayed technical effect is optimal and better than the water-cement ratio of 1.3 and 1.7. And the ethanolamine with the water mass ratio of 5-10% is added in the process of mixing the slurry, which is also beneficial to improving the reinforcing effect of the curing agent on three kinds of silt soft soil. In the use process of the carbon-fixing soft soil curing agent, when the reaction temperature of the slurry is lower than 40 ℃, the stability and strength of the curing agent on soft soil reinforcement are not improved.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present invention, and not for limiting the same; although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some or all of the technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit of the invention.
Claims (3)
1. A method for performing soft soil curing by using a carbon-fixing soft soil curing agent, which is characterized by comprising the following components in parts by weight: 30-50 parts of blast furnace slag, 5-16 parts of fly ash, 4-15 parts of waste concrete, 8-20 parts of steel slag, 5-16 parts of LF furnace refining slag, 5-10 parts of desulfurized gypsum, 8-15 parts of CaO, 1-2 parts of triethanolamine residue and 1-3 parts of potassium aluminum sulfate dodecahydrate; wherein the triethanolamine residue is solid residue generated in the production process of triethanolamine;
the blast furnace slag is prepared by punching with a seal method, and has the specification as follows: the 7d activity index is more than or equal to 80 percent, and the 28d activity index is more than or equal to 105 percent;
the fly ash is secondary or tertiary fly ash produced by a power plant;
the granularity of the waste concrete is less than or equal to 20mm, and the waste concrete does not contain reinforced sundries;
the granularity of the steel slag is less than or equal to 10mm, and the TFe content is less than or equal to 2%;
the granularity of the refining slag of the LF furnace is less than or equal to 20mm, and the TFe content is less than or equal to 2%;
the pH value of the desulfurized gypsum is more than or equal to 6.5, and the content of calcium sulfite is less than or equal to 0.4%;
the CaO is powder, and the specific surface area is more than or equal to 400m 2 /kg；
The soft soil curing step comprises the following steps:
(1) Mixing and pulping: adding 13-20wt% of carbon-fixing soft soil curing agent into undisturbed soil, adding water to ensure that the water-ash mass ratio is 1.3-1.7, adding a polycarboxylic acid high-efficiency water reducing agent accounting for 0.2-0.3% of the mass of the carbon-fixing soft soil curing agent, and mixing to prepare slurry; when the slurry is prepared by mixing, the ethanolamine with the mass of 5-10% of water is added;
(2) Curing: injecting the slurry into the filling area, and injecting CO into the slurry in the filling area 2 Gas, make slurry finish the solidification reaction;
CO injection 2 The method for the gas comprises the following steps: CO is arranged at the bottom of the slurry in the filling area 2 Distributor by CO 2 The distributor evenly injects CO into the slurry 2 The gas injection flow rate is controlled to be 10m 3 /h-50m 3 And/h, controlling the pressure to be 0.3-1 Mpa; the CO injection is gradually regulated according to the setting time and consistency of the slurry in the injection process 2 Controlling the flow and pressure of the gas, and controlling the size of bubbles in the slurry to be less than or equal to 0.1mm; simultaneously, CO is pulled upwards every 5-10min 2 Sparger to adjust CO 2 The position of the distributor is such that CO is injected 2 The action of the gas is gradually carried out upwards from the bottom of the slurry;
by jointly controlling CaO content and CO injection in the slurry 2 The speed of the gas is such that the reaction temperature of the slurry is 40-80 ℃.
2. The method according to claim 1, wherein the combined specific surface area of the carbon-fixing soft soil curing agent is more than or equal to 400m 2 /kg。
3. The method of claim 1, wherein in step (2), CO is injected 2 In the process, the CO in the slurry is homogenized by vibration 2 The gas forms a pore size that increases the solidity of the slurry.
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