CN110386805B - Novel sulphoaluminate-based sludge/soft soil curing agent and use method thereof - Google Patents
Novel sulphoaluminate-based sludge/soft soil curing agent and use method thereof Download PDFInfo
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- CN110386805B CN110386805B CN201910778879.5A CN201910778879A CN110386805B CN 110386805 B CN110386805 B CN 110386805B CN 201910778879 A CN201910778879 A CN 201910778879A CN 110386805 B CN110386805 B CN 110386805B
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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
- C04B28/14—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 calcium sulfate cements
- C04B28/142—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 calcium sulfate cements containing synthetic or waste calcium sulfate cements
- C04B28/144—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 calcium sulfate cements containing synthetic or waste calcium sulfate cements the synthetic calcium sulfate being a flue gas desulfurization product
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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
- 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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- Chemical Kinetics & Catalysis (AREA)
- Inorganic Chemistry (AREA)
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- Organic Chemistry (AREA)
- Soil Conditioners And Soil-Stabilizing Materials (AREA)
- Treatment Of Sludge (AREA)
Abstract
The invention disclosesA novel thioaluminate-base sludge curing agent for soft soil is prepared from thioaluminate cement clinker, desulfurized gypsum, strontium dregs and gamma-Al2O3The micro powder and calcined diatomite powder are used by mixing the sulphoaluminate cement clinker, the desulfurized gypsum and the strontium slag uniformly, and dissolving the gamma-Al with a certain amount of water2O3Micro powder and calcined diatomite powder, then adding the mixture into the solution to perform chemical reaction to obtain a viscous curing agent solution, and using the curing agent solution to stir the silt or soft soil or injecting the silt or soft soil in a grouting mode. The curing agent of the invention has the advantages of fast curing time, strong water absorption, high curing strength, small using amount of the curing agent, and diatomite and gamma-Al2O3Has a porous structure, and also has the water purification function of adsorbing heavy metal, impurities and the like in water, thereby not causing environmental pollution.
Description
Technical Field
The invention relates to the field of building materials, in particular to a novel sulphoaluminate-based sludge/soft soil curing agent and a using method thereof.
Background
The soft soil foundation has the characteristics of low strength, poor bearing capacity, large settling volume and the like, and the untreated soft soil foundation cannot be directly used as a building foundation. On the other hand, sludge landfill sites dug out in dredging projects of river channels and fish ponds face problems similar to those of soft soil foundations. The main reason for poor bearing capacity of soft soil foundations or sludge landfill sites is that the soft soil or sludge contains a large amount of water (generally up to over 100%). Most of free water in the silt or soft soil can be removed by a physical method (such as centrifugal dehydration, extrusion dehydration and the like), the water content of the silt or soft soil after the free water is removed can be reduced to about 60 percent, and a large amount of strong and weak combined water still exists around soil particles. In order to further reduce the water content of the sludge or soft soil treated by a physical method, a chemical curing agent is generally adopted, and the water in the soft soil or sludge is further consumed through the chemical reaction between the curing agent and the water in the sludge or soft soil, so that the aims of improving the bearing capacity and stability of a soft soil foundation or sludge and reducing the overflow amount of harmful substances are fulfilled.
The common portland cement used in the prior art consumes less water in the muddy water gasification process, so that the foundation with high water content such as soft soil or sludge is cured, the bearing capacity and stability are high, a large amount of cement is needed, the construction cost is greatly increased, and the excessive use of the common portland cement can generate a large amount of calcium hydroxide, so that the pH value of the cured sludge or soft soil is obviously increased, and the soil is salinized.
Disclosure of Invention
The invention aims to overcome the defects in the prior art and provide a novel sulphoaluminate-based sludge/soft soil curing agent which has good fluidity and strong water absorption and does not cause environmental pollution and a using method thereof.
In order to achieve the purpose, the technical scheme of the invention is as follows:
a novel sulphoaluminate-based sludge/soft soil curing agent is characterized by comprising sulphoaluminate cement clinker, desulfurized gypsum, strontium slag and gamma-Al2O3Micropowder, calcined diatomaceous earth powder.
Preferably, the raw materials comprise the following parts by weight,
40-50 parts of sulphoaluminate cement clinker;
15-25 parts of desulfurized gypsum;
10-15 parts of strontium slag;
the gamma-Al2O35-10 parts of micro powder;
5-10 parts of calcined diatomite powder.
Preferably, the calcined diatomite powder is diatomite powder calcined at a temperature of 500 ℃ or above.
Preferably, the sulphoaluminate cement clinker, the desulfurized gypsum, the strontium slag and the gamma-Al2O3The average particle size of the micro powder and the calcined diatomite powder is less than or equal to 50 μm and more than or equal to 5 μm.
Preferably, the gamma-Al2O3The weight of the micro powder is equal to the weight of the calcined diatomite powder.
The use method of the novel sulphoaluminate-based sludge/soft soil curing agent is characterized by comprising the following steps:
step S1: weighing the sulphoaluminate cement clinker, the desulfurized gypsum and the strontium slag according to the parts by weight in the claim 2, and uniformly stirring;
step S2: weighing water 5-10 times the weight of the sulphoaluminate cement clinker, and dissolving the gamma-Al in the weight part of the material according to claim 22O3Uniformly mixing the micro powder and calcined diatomite powder;
step S3: adding the mixture prepared in the step S1 into the solution obtained in the step S2, and uniformly stirring to obtain a curing agent solution;
step S4: the curing agent solution prepared in step S3 is used to stir sludge or soft soil, or is injected into sludge or soft soil in a grouting manner.
Preferably, in the step S1, the sulphoaluminate cement clinker, the desulfurized gypsum and the strontium slag are ground to have an average particle size of 50 μm or less and 5 μm or more.
Preferably, in the step S2, an amount of γ -Al is dissolved by using an ultrasonic mixing method2O3Micropowder and calcined diatomaceous earth powder.
Preferably, in the step S4, when the curing agent solution is used for stirring the sludge or the soft soil, the mass ratio of the sludge or the soft soil to the curing agent solution is 20-30: 1; when the grouting mode is adopted, the curing agent solution is diluted firstly, and the mass ratio of the silt or soft soil to the sulphoaluminate cement clinker is 8-12: 1 and 5-10: 1.
Preferably, in the step S2, the gamma-Al2O3The average particle diameter of the micro powder and the calcined diatomite powder is less than or equal to 50 μm and more than or equal to 5 μm.
According to the technical scheme, the curing agent takes sulphoaluminate cement clinker as a main component, takes the desulfurized gypsum as a gelling agent, and takes the calcium sulphoaluminate (chemical formula) in the sulphoaluminate cementAbbreviated as C4A3Can react with calcium sulfate (abbreviated as C) and calcium hydroxide (abbreviated as CH) in the desulfurized gypsum to consume a large amount of free water in sludge or soft soil and generate ettringite C6A$3H32With aluminium gel phase AH3Two hydration products, Sr in strontium slag2+Can react with unreacted calcium sulfate C $ in the desulfurized gypsum to generate microcrystalline strontium sulfate, thereby filling the pores of agglomerated sludge or soft soil particles, further improving the compressive strength after solidification and gamma-Al2O3The micro powder and the calcined diatomite have activity and are easy to react in aqueous solution to generate Al2O3-SiO2The product with net structure has pores, high water absorption, large specific surface area, high adsorbability, early cohesiveness, capacity of adsorbing calcium sulfate, calcium hydroxide, strontium sulfate, calcium sulfoaluminate, etc. and high reaction speed, and Al2O3-SiO2The net structure product can also be used as a filling agent, so that the solidified sludge or soft soil structure is firmer, and the compressive strength is improved. Diatomaceous earth and gamma-Al2O3Has a porous structure and also has the water purification function of adsorbing heavy metals, impurities and the like in water. Therefore, the curing agent of the invention not only has fast curing time and strong water absorption, but also improves the compressive strength after curing.
Detailed Description
The following provides a more detailed description of the present invention.
A novel sulphoaluminate-based sludge/soft soil curing agent comprises sulphoaluminate cement clinker, desulfurized gypsum, strontium slag and gamma-Al2O3Micropowder, calcined diatomaceous earth powder. The sulphoaluminate cement clinker is purchased SAC 42.5 grade industrial sulphoaluminate cement clinker, and the chemical composition range is shown in Table 1. The main component of the desulfurized gypsum, also known as flue gas desulfurization gypsum, is calcium sulfate. Production of SrCO in industrial production of strontium salt from strontium slag3The chemical composition range of the solid waste discharged later is shown in table 2. gamma-Al2O3The micro powder is gamma crystal form Al2O3Powder of Al2O3The content is more than 99 wt.%. The calcined diatomite powder is diatomite powder calcined at 500 ℃ or above. All the raw materials can be purchased.
TABLE 1 Sulfoaluminate Cement Clinker chemical composition Range
| Chemical composition | CaO | Al2O3 | SO3 | Fe2O3 | SiO2 | Others |
| Range | 36-43 | 28-40 | 8-15 | 1-3 | 3-10 | 5-10 |
TABLE 2 chemical composition range of strontium slag
| Chemical composition | SrO | CaO | Al2O3 | SO3 | Fe2O3 | SiO2 | Others |
| Range | 30-38 | 12-16 | 1-2 | 18-24 | 3-4 | 12-15 | 10-15 |
The calcined diatomite has activity, a large number of orderly arranged microporous structures and a water absorption effect, and after the diatomite is subjected to superfine grinding, the specific surface area is increased, and the surface energy is increased, so that the average particle size of the calcined diatomite is preferably less than or equal to 50 microns and more than or equal to 5 microns.
γ-Al2O3The micro powder also has activity, is a porous solid material with high dispersity, also has a large specific surface area, and the microporous surface of the micro powder has adsorption performance and surface activity. GranuleThe diameter is small and the specific surface area is large, preferably, gamma-Al2O3The average particle diameter of the fine powder is 50 μm or less and 5 μm or more.
Preferably, the average grain diameter of the sulphoaluminate cement clinker, the desulfurized gypsum and the strontium slag is less than or equal to 50 μm and more than or equal to 5 μm.
Preferably, the sulphoaluminate-based sludge soft soil curing agent consists of the following raw materials in parts by weight: 40-50 parts of sulphoaluminate cement clinker, 15-25 parts of desulfurized gypsum, 10-15 parts of strontium slag and 5-10 parts of gamma-Al2O3Micro powder and 5-10 parts of calcined diatomite powder.
When the curing agent is used, firstly, a certain amount of sulphoaluminate cement clinker, desulfurized gypsum and strontium slag are weighed and uniformly stirred for later use; preferably, grinding is carried out to an average particle size of less than 50 μm.
Then weighing water with the mass 5-10 times of that of the sulphoaluminate cement clinker, and dissolving gamma-Al2O3Uniformly mixing the micro powder and calcined diatomite powder; preferably, the ultrasound is mixed homogeneously. gamma-Al2O3The micro powder and the calcined diatomite powder react in an aqueous solution to generate Al2O3-SiO2The net-like structure product, which is faster in reaction speed, provides early cohesiveness to the solidified sludge. Al (Al)2O3-SiO2The net structure can effectively solidify tiny particles in silt/soft soil, and Al2O3And SiO2Cannot form a net structure when acting separately. In addition, gamma-Al2O3The micro powder and the calcined diatomite powder can not be mixed with the sulphoaluminate cement clinker and the desulfurized gypsum, and the hydration of the sulphoaluminate cement clinker and the gypsum can influence Al2O3-SiO2And (4) generating a net structure.
Dissolving the ground mixed powder of sulphoaluminate cement clinker, desulfurized gypsum and strontium slag in gamma-Al2O3Mixing the micropowder with calcined diatomite powder water solution, stirring well, and making into solidifying agent solution. In this step, calcium sulphoaluminate (chemical formula abbreviated as C) in the sulphoaluminate cement clinker4A3Can be mixed with sulfur in desulfurized gypsumCalcium carbonate (abbreviated as C) and calcium hydroxide (abbreviated as CH, from desulfurized gypsum, the main component of desulfurized gypsum is CaSO4, but a small amount of CH also exists) are subjected to chemical reaction, and the specific reaction is shown in formula (1) and formula (2).
C4A3$+2C$+38H2O→C6A$3H32+2AH3 (1)
4C4A3$+8C$+6CH+90H2O→3C6A$3H32 (2)
In the two hydration reaction processes, a large amount of free water is consumed and ettringite C is generated at the same time6A$3H32With aluminium gel phase AH3Two hydration products, of which AH is gelatinous3The product can bond fine silt or soft soil particles into a whole, and the microscopic appearance of the product presents C with needle-rod-shaped characteristics6A$3H32The staggered configuration may provide a carrier for the sludge particles.
Sr in strontium slag2+Can chemically react with unreacted calcium sulfate C $ in the desulfurized gypsum to generate microcrystalline strontium sulfate, thereby filling the pores of agglomerated sludge or soft soil particles and further improving the compressive strength after solidification.
Al2O3-SiO2The net-shaped structure product has pores, strong water absorption, large specific surface area, high reaction activity, strong adsorbability, and the like, can adsorb calcium sulfate, calcium hydroxide, strontium sulfate, calcium sulfoaluminate and the like, not only can accelerate the reaction speed, but also can increase the reaction speed by Al2O3-SiO2The net structure product can also be used as a filling agent, so that the solidified sludge or soft soil structure is firmer, and the compressive strength is improved.
When the prepared curing agent solution is used for curing the sludge or the soft soil, the curing agent solution and the sludge or the soft soil can be physically mixed for curing, the curing method is commonly used for treating the sludge or the soft soil on the ground surface, and the mass ratio of the sludge or the soft soil to the curing agent solution is 20-25: 1.
Or injecting the curing agent solution into silt or soft soil in the deep underground layer in a grouting manner, wherein in order to enhance the fluidity of the curing agent in the silt or soft soil, the curing agent solution is preferably diluted and then injected into the underground, and generally, the obtained curing agent solution is firstly diluted by water to increase the fluidity in the silt or soft soil, and then, the modification is that: the mass ratio of the sludge or soft soil to the sulphoaluminate cement clinker is 8-12: 1.
In conclusion, when the curing agent is used for curing the silt or the soft soil, the curing time is short, the water absorption is strong, the curing strength is high, the using amount of the curing agent is small, and the diatomite and the gamma-Al are used2O3Has a porous structure, and also has the water purification function of adsorbing heavy metal, impurities and the like in water, thereby not causing environmental pollution.
Example 1
This example is the use of such thioaluminate based sludge curing agents for the treatment of soft earth surface soils.
The raw materials of this example were a 42.5R sulphoaluminate cement clinker (chemical composition shown in table 3), a flue gas desulfurization gypsum (C $ content 92.5 wt.% as measured by Rietveld method), a strontium slag (chemical composition shown in table 4), a γ -Al clinker2O3Micropowder (Al)2O399.9 wt.% with an average particle size of 45 μm), a calcined diatomaceous earth (calcination temperature 550 ℃, SiO in chemical composition)292.3% with an average particle diameter of 42 μm).
TABLE 3 chemical composition of the sulphoaluminate cement clinker used in example 1
Table 4 strontium slag chemical composition used in example 1
The sulphoaluminate-based sludge soft soil curing agent is prepared from the following raw materials in parts by weight: 45 parts of sulphoaluminate cement clinker, 20 parts of desulfurized gypsum, 15 parts of strontium slag and 10 parts of gamma-Al2O3Micro powder10 parts of calcined diatomite powder.
The specific using process is as follows:
1. weighing sulphoaluminate cement clinker, desulfurized gypsum and strontium slag, and grinding and homogenizing the three raw materials by using a planetary ball mill, wherein the average particle size of the ground mixed powder is 38.2 mu m;
2. weighing 225 parts by weight of water in the sulphoaluminate cement clinker, and mixing gamma-Al2O3Mixing the micropowder and calcined diatomite powder in water, and then using industrial ultrasonic dispersion equipment to disperse gamma-Al2O3Carrying out ultrasonic treatment on the mixed solution of the micro powder and the calcined diatomite powder for 30 minutes;
3. dissolving the ground mixed powder of sulphoaluminate cement clinker, desulfurized gypsum and strontium slag in gamma-Al2O3Stirring the mixed solution by using a handheld stirrer in the micro powder and calcined diatomite powder aqueous solution to prepare a curing agent solution;
4. and directly mixing the curing agent solution with soft soil, wherein the mass ratio of the silt/soft soil to the curing agent is 20: 1.
Core-pulling sampling is respectively carried out on the untreated soft soil layer and the soft soil layer after the curing agent is cured for 28 days, experiments such as axial compressive strength test, water content test and the like are carried out on the sampled samples, and the experimental results are shown in table 5.
TABLE 5 comparison of Soft soil surface treatment test results
Example 2:
this example is the treatment of a subsurface 3-5m sludge layer using such a thioaluminate based sludge curing agent.
The raw materials of this example were a 42.5R sulphoaluminate cement clinker (chemical composition shown in table 6), a flue gas desulfurization gypsum (91.1 wt.% C $ content measured by Rietveld method), a strontium slag (chemical composition shown in table 7), a γ -Al clinker2O3Micropowder (Al)2O3The content was 99.9 wt.%, averageParticle size of 45 μm), a calcined diatomite (calcination temperature 550 deg.C, SiO in chemical composition292.3% with an average particle diameter of 42 μm).
Table 6 chemical composition of sulphoaluminate cement clinker used in example 2
Table 7 strontium slag chemistry used in example 2
The sulphoaluminate-based sludge soft soil curing agent is prepared from the following raw materials in parts by weight: 50 parts of sulphoaluminate cement clinker, 25 parts of desulfurized gypsum, 15 parts of strontium slag and 10 parts of gamma-Al2O3Micro powder, 10 parts of calcined diatomite powder.
The specific using process is as follows:
1. weighing sulphoaluminate cement clinker, desulfurized gypsum and strontium slag, and grinding and homogenizing the three raw materials by using a planetary ball mill, wherein the average particle size of the ground mixed powder is 36.7 mu m;
2. weighing 250 parts of water by mass of the sulphoaluminate cement clinker, and mixing gamma-Al2O3Mixing the micropowder and calcined diatomite powder in water, and then using industrial ultrasonic dispersion equipment to disperse gamma-Al2O3Carrying out ultrasonic treatment on the mixed solution of the micro powder and the calcined diatomite powder for 30 minutes;
3. dissolving the ground mixed powder of sulphoaluminate cement clinker, desulfurized gypsum and strontium slag in gamma-Al2O3Stirring the mixed solution by using a handheld stirrer in the micro powder and calcined diatomite powder aqueous solution to prepare a curing agent solution;
4. and mixing the curing agent solution with equal mass of water to prepare dilute slurry, and injecting the slurry into the ground, wherein the mass ratio of the sludge to the curing agent is 5: 1.
Core-pulling sampling is respectively carried out on the untreated sludge layer and the soft soil layer after the curing agent is cured for 28 days, experiments such as axial compressive strength test, water content test and the like are carried out on the sampled samples, and the experimental results are shown in Table 8.
Table 8 deep soft soil treatment experimental result comparison
Example 3
This example is the use of such thioaluminate based sludge curing agents for the treatment of soft earth surface soils.
The raw materials of this example were a 42.5R sulphoaluminate cement clinker (chemical composition shown in table 9), a flue gas desulfurization gypsum (C $ content 93.4 wt.% as measured by Rietveld method), a strontium slag (chemical composition shown in table 10), a γ -Al clinker2O3Micropowder (Al)2O399.9 wt.% with an average particle size of 45 μm), a calcined diatomaceous earth (calcination temperature 550 ℃, SiO in chemical composition)292.3% with an average particle diameter of 42 μm).
TABLE 9 chemical composition of the sulphoaluminate cement clinker used in example 3
Table 10 strontium slag chemistry used in example 3
The sulphoaluminate-based sludge soft soil curing agent is prepared from the following raw materials in parts by weight: 40 parts of sulphoaluminate cement clinker, 15 parts of desulfurized gypsum, 10 parts of strontium slag and 5 parts of gamma-Al2O3Micro powder and 5 parts of calcined diatomite powder.
The specific using process is as follows:
1. weighing sulphoaluminate cement clinker, desulfurized gypsum and strontium slag, and grinding and homogenizing the three raw materials by using a planetary ball mill, wherein the average particle size of the ground mixed powder is 27.8 mu m;
2. weighing 200 parts of water by mass of the sulphoaluminate cement clinker, and mixing gamma-Al2O3Mixing the micropowder and calcined diatomite powder in water, and then using industrial ultrasonic dispersion equipment to disperse gamma-Al2O3Carrying out ultrasonic treatment on the mixed solution of the micro powder and the calcined diatomite powder for 30 minutes;
3. dissolving the ground mixed powder of sulphoaluminate cement clinker, desulfurized gypsum and strontium slag in gamma-Al2O3Stirring the mixed solution by using a handheld stirrer in the micro powder and calcined diatomite powder aqueous solution to prepare a curing agent solution;
4. and directly mixing the curing agent solution with soft soil, wherein the mass ratio of the silt/soft soil to the curing agent is 6: 1.
Core-pulling sampling is respectively carried out on the untreated soft soil layer and the soft soil layer after the curing agent is cured for 28 days, experiments such as axial compressive strength test, water content test and the like are carried out on the sampled samples, and the experimental results are shown in table 11.
Table 11 comparison of soft soil surface treatment experimental results
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and the technical solutions and the inventive concepts thereof according to the present invention should be equivalent or changed within the scope of the present invention.
Claims (7)
1. A sulphoaluminate-based sludge/soft soil curing agent is characterized by comprising sulphoaluminate cement clinker, desulfurized gypsum, strontium slag and gamma-Al2O3Micro powder and calcined diatomite powder; the weight parts of the raw materials are as follows:
40-50 parts of sulphoaluminate cement clinker,
15-25 parts of desulfurized gypsum,
10-15 parts of strontium slag,
γ-Al2O35-10 parts of micro powder,
5-10 parts of calcined diatomite powder;
the gamma-Al2O3The weight of the micro powder is equal to that of the calcined diatomite powder;
the calcined diatomite powder is calcined diatomite powder at the temperature of 500 ℃ or above;
mixing gamma-Al2O3The micro powder and the calcined diatomite powder are mixed evenly.
2. The sulfoaluminate-based sludge/soft soil curing agent of claim 1, wherein the sulfoaluminate cement clinker, desulfurized gypsum, strontium slag, gamma-Al2O3The average particle size of the micro powder and the calcined diatomite powder is less than or equal to 50 μm and more than or equal to 5 μm.
3. The method of using the sulphoaluminate-based sludge/soft soil curing agent as claimed in any of claims 1 to 2, comprising the steps of:
step S1: weighing the sulphoaluminate cement clinker, the desulfurized gypsum and the strontium slag in parts by weight, and uniformly stirring;
step S2: weighing water which is 5-10 times of the weight of the sulphoaluminate cement clinker, and dissolving the gamma-Al in parts by weight2O3Uniformly mixing the micro powder and calcined diatomite powder;
step S3: adding the mixture prepared in the step S1 into the solution obtained in the step S2, and uniformly stirring to obtain a curing agent solution;
step S4: the curing agent solution prepared in step S3 is used to stir sludge or soft soil, or is injected into sludge or soft soil in a grouting manner.
4. The method according to claim 3, wherein in step S1, the sulphoaluminate cement clinker, the desulphurized gypsum and the strontium slag are ground to an average particle size of 50 μm or less and 5 μm or more.
5. The method of claim 3, wherein in the step S2, an amount of γ -Al is dissolved by ultrasonic mixing2O3Micropowder and calcined diatomaceous earth powder.
6. The method according to claim 3, wherein in the step S4, when the curing agent solution is used for stirring the sludge or the soft soil, the mass ratio of the sludge or the soft soil to the curing agent solution is 20-30: 1; when a grouting mode is adopted, the curing agent solution is diluted firstly, and the mass ratio of the sludge or soft soil to the sulphoaluminate cement clinker is 8-12: 1.
7. The method of claim 3, wherein in the step S2, the gamma-Al is added2O3The average particle diameter of the micro powder and the calcined diatomite powder is less than or equal to 50 μm and more than or equal to 5 μm.
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| US6869474B2 (en) * | 2002-08-29 | 2005-03-22 | United States Gypsum Company | Very fast setting cementitious composition |
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