CN107663044B - Geopolymer type soft soil cementing agent and preparation method thereof - Google Patents

Geopolymer type soft soil cementing agent and preparation method thereof Download PDF

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CN107663044B
CN107663044B CN201710171392.1A CN201710171392A CN107663044B CN 107663044 B CN107663044 B CN 107663044B CN 201710171392 A CN201710171392 A CN 201710171392A CN 107663044 B CN107663044 B CN 107663044B
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soft soil
industrial waste
waste residue
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CN107663044A (en
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陈伟
乐绍林
朱慈祥
王伟
孟宪鹏
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CCCC Road and Bridge Special Engineering Co Ltd
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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
    • C04B28/006—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 mineral polymers, e.g. geopolymers of the Davidovits type
    • 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
    • C04B18/00—Use of agglomerated or waste materials or refuse as fillers for mortars, concrete or artificial stone; Treatment of agglomerated or waste materials or refuse, specially adapted to enhance their filling properties in mortars, concrete or artificial stone
    • C04B18/04—Waste materials; Refuse
    • C04B18/06—Combustion residues, e.g. purification products of smoke, fumes or exhaust gases
    • C04B18/08—Flue dust, i.e. fly ash
    • 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
    • C04B18/00—Use of agglomerated or waste materials or refuse as fillers for mortars, concrete or artificial stone; Treatment of agglomerated or waste materials or refuse, specially adapted to enhance their filling properties in mortars, concrete or artificial stone
    • C04B18/04—Waste materials; Refuse
    • C04B18/14—Waste materials; Refuse from metallurgical processes
    • C04B18/141—Slags
    • 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
    • C04B24/00—Use of organic materials as active ingredients for mortars, concrete or artificial stone, e.g. plasticisers
    • C04B24/40—Compounds containing silicon, titanium or zirconium or other organo-metallic compounds; Organo-clays; Organo-inorganic complexes
    • C04B24/42—Organo-silicon compounds
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
    • C08F283/00—Macromolecular compounds obtained by polymerising monomers on to polymers provided for in subclass C08G
    • C08F283/12—Macromolecular compounds obtained by polymerising monomers on to polymers provided for in subclass C08G on to polysiloxanes
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    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P40/00—Technologies relating to the processing of minerals
    • Y02P40/10—Production of cement, e.g. improving or optimising the production methods; Cement grinding
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
    • Y02W30/00—Technologies for solid waste management
    • Y02W30/50—Reuse, recycling or recovery technologies
    • Y02W30/91—Use of waste materials as fillers for mortars or concrete

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  • Combustion & Propulsion (AREA)
  • Health & Medical Sciences (AREA)
  • Medicinal Chemistry (AREA)
  • Polymers & Plastics (AREA)
  • Processing Of Solid Wastes (AREA)
  • Curing Cements, Concrete, And Artificial Stone (AREA)
  • Soil Conditioners And Soil-Stabilizing Materials (AREA)

Abstract

The invention provides a geopolymer type soft soil cementing agent and a preparation method thereof, wherein the geopolymer type soft soil cementing agent comprises the following raw materials in parts by weight: 65-75 parts of industrial waste residue, 20-30 parts of metakaolin, 5-12 parts of potassium silicate and 0.3-1 part of activating agent, wherein the cementing agent has excellent modifying, dehydrating and consolidating effects on soft soil fine particles (including silt, mucky soil, sludge, over-wet soil and the like), the soft soil cementing agent is used for soft soil fine particles, and more than 65% of raw materials of the soft soil cementing agent are industrial solid wastes. Therefore, when industrial solid waste is treated, the treatment of waste by waste is realized, and the soft soil cementing agent has the advantages of simple raw material composition, convenient material acquisition and easy control of the product quality. And the preparation method has low energy consumption, small environmental pollution and environmental protection.

Description

Geopolymer type soft soil cementing agent and preparation method thereof
Technical Field
The invention relates to the field of fine chemical engineering, in particular to a geopolymer type soft soil cementing agent and a preparation method thereof.
Background
The soft soil is fine soil formed by deposition environments such as coastal phase, lagoon phase, delta phase, river and lake phase, and the like, the natural pore ratio of the fine soil is greater than or equal to 1.0, and the natural water content of the fine soil is greater than the liquid limit. Mainly comprises silt (the natural pore ratio e is more than 1.5), mucky soil (the natural pore ratio e is more than 1.0 and less than 1.5) and the like. Due to the fine particle characteristic of the soft soil, toxic and harmful substances are easily adsorbed to the soft soil, so that the soft soil becomes a secondary pollution source; the high porosity characteristic makes the mechanical property not meet the requirement of engineering soil, and the disposal of the pile will occupy a large amount of land resources. Therefore, soft soil is one of the solid wastes which are difficult to treat and urgently needed to treat.
With the vigorous development of the national environmental protection industry, especially the concept of domestic environmental management of 'heavy water and light mud', the method gradually changes to the concept of 'heavy mud and water'. A large amount of polluted river and lake dredging sludge (soft soil) is randomly stacked without being treated, so that the serious secondary pollution problem is caused, and treatment is urgently needed. By using the cementing and curing treatment method, toxic and harmful substances in the soft soil can be sealed and fixed in the crystal structure, and are prevented from being released to the environment again, so that secondary pollution is avoided. In addition, the inland water area in China is large, the coastal line is long, the soft soil stock for forming a coastal phase, a lake-purging phase and a delta phase by deposition is huge, and a large amount of engineering construction needs to be implemented on a soft soil foundation. Therefore, the processing method of cementing and curing can modify the soft soil into the soil meeting the requirements of engineering, and provides favorable conditions for the smooth implementation of subsequent construction engineering.
At present, the soft soil curing agent is still used as a traditional cementing material of cement, lime, gypsum and the like which are relatively common in engineering materials of soft soil dehydration modification, cementation curing and the like, or is a material improved on the basis of materials of cement, lime and the like, but still has some disadvantages, a patent with a patent application number of 200810019417.7 discloses a soft soil curing agent, wherein a main agent of the soft soil curing agent is inorganic raw materials of cement, lime, fly ash, slag, gypsum and the like, and an auxiliary agent is an exciting material of triethanolamine, calcium lignosulfonate, polyacrylamide, sodium chloride and the like.
In conclusion, in the treatment process of soft soil cementation and solidification, the cement type cementing agent has the problems that the high alkalinity affects the surrounding environment, the acid and alkali resistance is poor, the engineering application is limited, and the like; the lime cementing agent has the defects of poor water resistance, poor durability and the like; the improved material still uses cement, lime and the like as main raw materials, so that the problems of cement curing agents and lime curing agents, complex raw material components, difficulty in controlling the product quality, potential environmental pollution caused by introduced modifiers and the like exist.
Disclosure of Invention
In order to solve the defects, the invention provides a geopolymer type soft soil cementing agent and a preparation method thereof, which have excellent modifying, dehydrating and consolidating effects on soft soil type fine particles (including silt, mucky soil, sludge, over-wet soil and the like).
The invention provides a geopolymer type soft soil cementing agent which comprises the following raw materials in parts by weight: 65-75 parts of industrial waste residue, 20-30 parts of metakaolin, 5-12 parts of potassium silicate and 0.3-1 part of activating agent.
The cementing agent comprises the following raw materials in parts by weight: 65 parts of industrial waste residue, 20 parts of metakaolin, 5 parts of potassium silicate and 0.3 part of activating agent.
The cementing agent comprises the following raw materials in parts by weight: 75 parts of industrial waste residue, 30 parts of metakaolin, 12 parts of potassium silicate and 1 part of activating agent.
In the cementing agent, the industrial waste residue is silicon-aluminum based industrial waste residue.
The cementing agent, wherein the potassium silicate is solid potassium silicate with a modulus of 1.65-1.95.
The cementing agent, wherein the silicon-aluminum-based industrial waste residue is industrial solid waste which contains low-degree silicon-oxygen tetrahedron and aluminum-oxygen tetrahedron structures and has latent gelling activity.
The cementing agent is characterized in that the silicon-aluminum-based industrial waste residue is as follows: granulating at least one of blast furnace slag, fly ash and bottom ash of a high-temperature power plant, or silicon-aluminum-based industrial waste slag containing glassy-state gehlenite, akermanite and wollastonite; the metakaolin is: the kaolin is calcined at the temperature of 700-750 ℃ to form the active silicon-aluminum oxide.
The cementing agent is characterized in that the activating agent is: side group modified polymethylpropylaminosiloxane.
The invention also discloses a preparation method of the geopolymer soft soil cementing agent, which comprises the following steps:
synthesizing an activating agent;
mixing the raw materials.
The method above, wherein the step of synthesizing the activator comprises:
adding allyl ketene imine and a catalyst H2PtCl into dimethylformamide, preheating to 80-90 ℃, and adding polymethylhydrosiloxane;
controlling the temperature in the reaction kettle within 90 ℃, stirring and reacting for 3-4 h, and reducing the temperature of the reaction liquid to below 70 ℃ after the reaction liquid becomes a uniform phase;
cooling to 50-60 ℃, adding a 10% dilute nitric acid solution for acidic hydrolysis, reacting for 4-6 h, washing with water to remove the solvent, precipitating and separating out the polymer, repeating the dissolving and precipitating for 3 times, and then performing freeze drying and purification to obtain the polymethylpropylamine siloxane with the side chain containing amino;
the step of mixing the raw materials comprises:
drying the raw materials, and then grinding the dried silicon-aluminum-based industrial waste residues until the specific surface area is more than or equal to 450m2/kg to obtain silicon-aluminum-based industrial waste residue powder;
and then mixing metered silicon-aluminum-based industrial waste residue powder, metakaolin, potassium silicate and an activating agent according to the dosage, and grinding until the screen residue of 200 meshes is less than or equal to 1 percent to obtain the cementing agent.
The invention has the following advantages:
1. the soft soil cementing agent is hydrated to form a three-dimensional reticular mineral polymer, so that the engineering mechanical property and the dehydration property of soft soil fine particles can be improved, heavy metals can be stabilized, and the effect is stable;
2. the hydration solution of the soft soil cementing agent has the characteristic of low alkalinity, has little influence on the surrounding environment and belongs to an environment-friendly product;
3. the soft soil cementing agent is used for soft soil fine particles, and more than 65% of raw materials of the soft soil cementing agent are industrial solid wastes. Therefore, when industrial solid waste is treated, the treatment of waste by waste is realized;
4. the soft soil cementing agent has the advantages of simple raw material composition, convenient material acquisition and easy control of the product quality. And the preparation method has low energy consumption, small environmental pollution and environmental protection.
Detailed Description
In the following description, numerous specific details are set forth in order to provide a more thorough understanding of the present invention. It will be apparent, however, to one skilled in the art, that the present invention may be practiced without one or more of these specific details. In other instances, well-known features have not been described in order to avoid obscuring the invention.
In the following description, for the purposes of explanation, numerous specific details are set forth in order to provide a thorough understanding of the present invention. The following detailed description of the preferred embodiments of the invention, however, the invention is capable of other embodiments in addition to those detailed.
Embodiment 1, a geopolymer type soft soil cementing agent, comprising the following raw materials by weight: 65-75 parts of industrial waste residue, 20-30 parts of metakaolin, 5-12 parts of potassium silicate and 0.3-1 part of activating agent, wherein the industrial waste residue is silicon-aluminum based industrial waste residue, the potassium silicate is solid potassium silicate with the modulus of 1.65-1.95, and the activating agent is as follows: side group modified polymethylpropylaminosiloxane.
Embodiment 2, a geopolymer type soft soil cementing agent, comprising the following raw materials by weight: 65 parts of industrial waste residue, 20 parts of metakaolin, 5 parts of potassium silicate and 0.3 part of activating agent, wherein the industrial waste residue is silicon-aluminum based industrial waste residue, the potassium silicate is solid potassium silicate with the modulus of 1.65-1.95, and the activating agent is as follows: side group modified polymethylpropylaminosiloxane.
Embodiment 3, a geopolymer type soft soil cementing agent, comprising the following raw materials by weight: 75 parts of industrial waste residue, 30 parts of metakaolin, 12 parts of potassium silicate and 1 part of activating agent, wherein the industrial waste residue is silicon-aluminum based industrial waste residue, the potassium silicate is solid potassium silicate with the modulus of 1.65-1.95, and the activating agent is as follows: side group modified polymethylpropylaminosiloxane.
In a preferred but non-limiting embodiment of the present invention, the silicoaluminous industrial residue is an industrial solid waste containing low degree of silico-alumino tetrahedron and alumino-tetrahedron structures and having latent gelling activity, and more preferably, the silicoaluminous industrial residue is: granulating at least one of blast furnace slag, fly ash and bottom ash of a high-temperature power plant, or silicon-aluminum-based industrial waste slag containing glassy-state gehlenite, akermanite and wollastonite; the metakaolin is: the kaolin is calcined at the temperature of 700-750 ℃ to form the active silicon-aluminum oxide.
Embodiment 4, a geopolymer type soft soil cement, comprising the following raw materials by weight: 45 parts of granulated blast furnace slag; 25 parts of fly ash; 20 parts of metakaolin; 9 parts of potassium silicate; 1 part of polymethyl propyl amine siloxane, and the preparation process is as follows: drying the raw materials, and grinding the dried granulated blast furnace slag and the fly ash until the specific surface area is more than or equal to 450m2Per kg, obtaining silicon-aluminum based industrial waste residue powder; then mixing the silicon-aluminum-based industrial waste residue powder, metakaolin, potassium silicate and polymethyl propyl amine siloxane, and grinding until the screen residue of 200 meshes is less than or equal to 1%.
Embodiment 5, a geopolymer type soft soil cement, comprising the following raw materials by weight: 65 parts of granulated blast furnace slag; 23 parts of metakaolin; 11.5 parts of potassium silicate; 0.5 part of polymethyl propyl amine siloxane, and the preparation process comprises the following steps: drying the raw materials, and grinding the dried granulated blast furnace slag until the specific surface area is more than or equal to 450m2Per kg, obtaining silicon-aluminum based industrial waste residue powder; then mixing the silicon-aluminum-based industrial waste residue powder, metakaolin, potassium silicate and polymethyl propyl amine siloxane, and grinding until the screen residue of 200 meshes is less than or equal to 1%.
Embodiment 6, a geopolymer type soft soil cement, comprising the following raw materials by weight: 56 parts of granulated blast furnace slag; 18 parts of high-temperature power plant bottom ash; 20 parts of metakaolin; 5.7 parts of potassium silicate; 0.3 part of polymethyl propyl amine siloxane, and the preparation process comprises the following steps: firstly, useDrying the raw materials, and then grinding the dried granulated blast furnace slag until the specific surface area is more than or equal to 450m2Per kg, obtaining silicon-aluminum based industrial waste residue powder; then mixing the silicon-aluminum-based industrial waste residue powder, metakaolin, potassium silicate and polymethyl propyl amine siloxane, and grinding until the screen residue of 200 meshes is less than or equal to 1%.
Embodiment 7, a geopolymer type soft soil cement, comprising the following raw materials by weight: 41 parts of granulated blast furnace slag; 12 parts of fly ash; 12 parts of high-temperature power plant bottom ash; 29 parts of metakaolin; 5.4 parts of potassium silicate; 0.6 part of polymethyl propyl amine siloxane, and the preparation process comprises the following steps: drying the raw materials, and grinding the dried silicon-aluminum-based industrial waste slag until the specific surface area is more than or equal to 450m2Per kg, obtaining silicon-aluminum based industrial waste residue powder; then mixing the silicon-aluminum-based industrial waste residue powder, metakaolin, potassium silicate and polymethyl propyl amine siloxane, and grinding until the screen residue of 200 meshes is less than or equal to 1%.
The geopolymer type soft soil cementing agents obtained in examples 4 to 7 are respectively mixed with the river dredging sludge (the physicochemical indexes of the agent are shown in the following table 1), and the mixing amount of the agent is 6% of the total material mass. After uniform stirring, the mixture is placed into a test mold with the thickness of 70.7 multiplied by 70.7mm and vibrated for molding. The mould is removed after 1 day, the mixture is placed under standard curing conditions for curing for 7 days, the physicochemical indexes of the modified soil of the three ingredients and the indexes of the leaching toxicity of the heavy metal are respectively detected, and the specific experimental contrast values are shown in the following table 2.
TABLE 1 comparison table of physicochemical indexes of original and modified soil samples
Figure BDA0001251242410000061
Table 2 comparison table of heavy metal leaching toxicity of original soil sample and modified soil sample
Figure BDA0001251242410000062
As can be seen from tables 1 and 2, the performance of the modified soil sample is greatly improved, and the heavy metal content of the soil sample is obviously reduced.
The action principle of the geopolymer soft soil cementing agent is as follows: potassium silicate K having a modulus of 1.65 to 1.95 in the raw material2(H3SiO4)2After meeting water, the raw materials are firstly subjected to dissolution and depolymerization reactions, a large amount of KOH is formed in the hydrolysis process, and bridge oxygen between silicon atoms is attacked to promote depolymerization, so that orthosilicate, silica unimer, disiloxane and the like are formed, wherein the reaction process is as follows:
Figure BDA0001251242410000071
the silicon-aluminum-based industrial waste residue in the raw materials contains abundant glassy state gehlenite, akermanite, wollastonite and the like. Wherein the structural composition of the gehlenite mainly comprises-Si-O-Al-sequence, and the sequence is broken and dissociated in an alkaline environment to form calcium disilicate Ca2(H3SiO4)2N-aluminosilicate (OH)3—Si—O—Al—(OH)3And aluminate ion [ Al (OH) ]4 —](ii) a The akermanite dissociates to form calcium disilicate and magnesium hydroxide.
The metakaolin in the raw material is active silicon-aluminum oxide (Si) formed by calcining at 700-750 DEG C2O5,Al2O5) The structure mainly comprises a covalent bond sequence of Si-O-Al ═ O and a covalent bond sequence of-Si-O-Al-OH. In the alkaline environment released during the hydrolysis of potassium and calcium silicates, the dissociation forms orthosilicate, aluminosilicate and aluminate ions.
After being mixed with water, the raw materials are hydrolyzed in sequence to form a large amount of orthosilicate, aluminosilicate, silica unimer, disiloxane, aluminate ion and other plasma intermediates in a mixed system. Wherein, the orthosilicate is composed of alkaline silicon oxygen group (Si-OH), can form disilicon aluminum body with aluminate ion polycondensation, and then form mineral polymer with network structure by condensation; Al-OH and Si-OK in the n-aluminosilicate undergo polycondensation to form a cyclic disilicon-aluminium structure, and KOH is released along with the formation of the cyclic disilicon-aluminium structure, so that the cyclic disilicon-aluminium structure can participate in the reaction again. The cyclic disilicon structure is then condensed to form a tetrahedral or hexahedral hydrated skutterudite network. The formed three-dimensional network geopolymer can be bonded with crystal defects or broken bonds on the surfaces of the soft soil fine particles, so that the cohesive force among the soft soil fine particles is enhanced. The overall reaction equation is shown in the following formula:
2(Si2O5,Al2O5)+K2(H3SiO4)2+Ca2(H3SiO4)2→(K2O,CaO)(8SiO2,2Al2O3,nH2O)
the activating agent in the raw material is polysiloxane modified by side groups, and the functional group introduced by modification is amino. In the mixed slurry, the activator participates in the bonding process of the geopolymer due to the existence of silicon-oxygen bonds; on the other hand, the bonding occurs with the defects or broken bonds on the surface of the soft soil particles. A regular and controllable void ratio cementing body is formed between the geopolymer and the soft soil particles, so that the pores between the soft soil particles are extruded and filled, and the surface performance of the soft soil particles is changed. And the amido in the activator has strong complexing performance, and can capture heavy metal ions in soft soil particles to form a complex, so that the heavy metal ions are promoted to enter a crystal structure.
The invention also provides a preparation method of the geopolymer soft soil cementing agent, which comprises the following steps:
step 1, synthesis of an activating agent, specifically comprising ① adding allyl ketene imine H into an industrial solvent (dimethylformamide)2C＝CH—CH2—N＝C(CH3)2(amount 10% by mass of industrial solvent) and catalyst H2PtCl (measured to be 5 per mill of the mass of allyl ketene imine), preheating to 80-90 ℃, and adding polymethylhydrosiloxane (measured to be 10 percent of the mass of an industrial solvent);
② controlling the temperature in the reaction kettle within 90 ℃, stirring and reacting for 3-4 h, and reducing the temperature of the reaction liquid to below 70 ℃ after the reaction liquid becomes a uniform phase;
③ at 50-60 deg.C, adding 10% dilute nitric acid solution (5 times of industrial solvent), reacting for 4-6 h, washing with water to remove solvent, precipitating polymer, repeating 3 times to dissolve and precipitate, and freeze drying to obtain polymethylpropylamine siloxane with side chain containing amino group, wherein the reaction process is as follows:
Figure BDA0001251242410000081
step 2: mixing the raw materials, specifically, drying the silicon-aluminum-based industrial waste residue, metakaolin, potassium silicate and an activating agent, and then grinding the dried silicon-aluminum-based industrial waste residue until the specific surface area is more than or equal to 450m2Per kg, obtaining silicon-aluminum based industrial waste residue powder; then mixing the measured silicon-aluminum based industrial waste residue powder, metakaolin, potassium silicate and activating agent according to the dosage, and grinding until the sieving residue of 200 meshes is less than or equal to 1 percent to obtain the geopolymer soft soil cementing agent.
The above description is of the preferred embodiment of the invention. It is to be understood that the invention is not limited to the particular embodiments described above, in that devices and structures not described in detail are understood to be implemented in a manner common in the art; those skilled in the art can make many possible variations and modifications to the disclosed embodiments, or modify equivalent embodiments to equivalent variations, without departing from the spirit of the invention, using the methods and techniques disclosed above. Therefore, any simple modification, equivalent change and modification made to the above embodiments according to the technical essence of the present invention are still within the scope of the protection of the technical solution of the present invention, unless the contents of the technical solution of the present invention are departed.

Claims (8)

1. The geopolymer type soft soil cementing agent is characterized by comprising the following raw materials in parts by weight: 65-75 parts of industrial waste residue, 20-30 parts of metakaolin, 5-12 parts of potassium silicate and 0.3-1 part of activating agent; the industrial waste residue is silicon-aluminum based industrial waste residue; the activating agent is: side group modified polymethylpropylaminosiloxane;
the preparation method of the side group modified polymethylpropylamine siloxane comprises the following steps:
adding allyl ketene imine shown in formula I and catalyst into dimethyl formamide
Figure DEST_PATH_IMAGE001
Preheating to 80-90 ℃, and then adding polymethylhydrosiloxane;
Figure 201107DEST_PATH_IMAGE002
formula I
Controlling the temperature in the reaction kettle within 90 ℃, stirring and reacting for 3-4 h, and reducing the temperature of the reaction liquid to below 70 ℃ after the reaction liquid becomes a uniform phase;
and (3) cooling to 50-60 ℃, adding a 10% dilute nitric acid solution for acidic hydrolysis, reacting for 4-6 h, washing with water to remove the solvent, precipitating and separating out the polymer, repeating the dissolving and precipitating for 3 times, and then performing freeze drying and purification to obtain the polymethylpropylamine siloxane with the side chain containing amino.
2. The geopolymer soft soil cement of claim 1, comprising the following raw materials in parts by weight: 65 parts of industrial waste residue, 20 parts of metakaolin, 5 parts of potassium silicate and 0.3 part of activating agent.
3. The geopolymer soft soil cement of claim 1, comprising the following raw materials in parts by weight: 75 parts of industrial waste residue, 30 parts of metakaolin, 12 parts of potassium silicate and 1 part of activating agent.
4. A geopolymer soft soil cement as claimed in claim 1, wherein said potassium silicate is a 1.65 to 1.95 modulus solid potassium silicate.
5. The geopolymer-based soft soil cement of claim 1, wherein the silica-alumina-based industrial waste residue is an industrial solid waste containing low-degree silica tetrahedron and aluminumoxy tetrahedron structures and having a latent gelation activity.
6. The geopolymer type soft soil cement of claim 1, wherein the silica-alumina based industrial waste residue is: at least one of granulated blast furnace slag, fly ash and bottom ash of a high-temperature power plant, wherein the metakaolin is: the kaolin is calcined at the temperature of 700-750 ℃ to form the active silicon-aluminum oxide.
7. The method for preparing the geopolymer soft soil cementing agent of any one of claims 1 to 6, which is characterized by comprising the following steps:
synthesizing an activating agent;
mixing the raw materials.
8. The method of claim 7, wherein the step of mixing the raw materials comprises:
drying the raw materials, and grinding the dried silicon-aluminum-based industrial waste slag until the specific surface area is more than or equal to 450m2Per kg, obtaining silicon-aluminum based industrial waste residue powder;
and then mixing metered silicon-aluminum-based industrial waste residue powder, metakaolin, potassium silicate and an activating agent according to the dosage, and grinding until the screen residue of 200 meshes is less than or equal to 1 percent to obtain the cementing agent.
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