CN118388194A - Stabilizer for separating dregs and preparation method and application thereof - Google Patents
Stabilizer for separating dregs and preparation method and application thereof Download PDFInfo
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- CN118388194A CN118388194A CN202410609683.4A CN202410609683A CN118388194A CN 118388194 A CN118388194 A CN 118388194A CN 202410609683 A CN202410609683 A CN 202410609683A CN 118388194 A CN118388194 A CN 118388194A
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Landscapes
- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
The invention relates to a stabilizer for separating dregs and a preparation method and application thereof, belongs to the technical field of road engineering materials, and aims to solve the problems that the existing stabilizer is high in cost, poor in mechanical property for separating dregs under a lower mixing amount and the like. The raw materials for preparing the residue soil stabilizer are mainly industrial waste residues, the industrial solid waste is utilized, the recycling utilization rate of the industrial solid waste is improved, and meanwhile, the conventional cementing materials such as high-carbon-emission cement, lime and the like can be replaced, so that the resource consumption is reduced, the production cost is reduced, the carbon emission is reduced, and the environment is protected; the stabilizer is prepared from the raw materials in a specific proportion, has good mechanical property for stabilizing and separating the dregs, exceeds the application effect of the soil stabilizer taking cement as a matrix, and has the unconfined compressive strength of more than 2.5MPa in 7 days.
Description
Technical Field
The invention relates to the technical field of road engineering materials, in particular to a stabilizer for separating dregs and soil, a preparation method and application thereof.
Background
In recent years, the annual production of urban building rubbish in China exceeds 20 hundred million tons, and the annual production of urban building rubbish accounts for about 40 percent of the total amount of urban solid waste. Wherein the dregs type construction waste accounts for about 70 percent, and the proportion of the dregs type construction waste accounts for the highest in the total amount of the construction waste.
The separation of the muck is a renewable precious resource, and research and practice show that the resource utilization of the muck in road engineering construction is one of the most effective ways for the muck to be consumed. When the mixing amount of the cementing material is low, for example, 4% -6%, the problems of slow formation of the stabilized soil, low compressive strength, low mechanical property, influence on engineering progress and the like often exist, and the existing inorganic cementing material needs a high mixing amount of the cementing material.
On the other hand, the annual output of industrial waste residues in China exceeds 30 hundred million tons, and the resource utilization of the solid waste materials has a large lifting space. If the industrial waste residue is used as cementing material to stably separate the slag soil for the road subbase, the consumption of the traditional inorganic cementing material is reduced, and then the consumption of natural mineral resources such as limestone, clay and the like is greatly reduced, the cost is saved, the carbon emission is reduced, and a new way is opened up for the recycling of solid waste materials.
Disclosure of Invention
In view of the analysis, the invention aims to provide a stabilizer for separating dregs and a preparation method and application thereof, which are used for solving the problems that the existing stabilizer is high in cost, poor in mechanical property for separating dregs under the condition of low mixing amount and the like.
In a first aspect, the invention provides a stabilizer for separating dregs, which comprises the following raw materials in parts by weight: 40-60 parts of slag powder, 10-30 parts of silicate cement clinker, 10-20 parts of alkali slag, 5-15 parts of coking desulfurization ash, 5-10 parts of CFB fly ash and 5-10 parts of steel slag powder.
Further, the slag powder is modified slag powder, and the modified slag powder is obtained by modifying the slag powder through polyethylene glycol and sodium alginate.
Further, the modified slag powder is prepared by the following method: mixing slag powder, polyethylene glycol, sodium alginate and water, reacting at 190-200 ℃, drying, and pulverizing to obtain modified slag powder.
Further, the mass ratio of the slag powder to the polyethylene glycol to the sodium alginate to the water is 3-6:1.2-1.4:0.6-0.8:10.
Further, the 7d activity index of the slag powder is 70% -75%, and the 28d activity index is more than or equal to 95%;
the content of CaO in the silicate cement clinker is 60-70%, the content of SiO 2 is 20-30%, and the content of Al 2O3 is 2-10%.
Further, the pH value of the alkaline residue is 10-12, and the water content is less than or equal to 1%;
The content of CaO in the coking desulfurization ash is 60% -70%, and the content of SO 3 is 3% -7%.
Further, in the CFB fly ash, the content of SiO 2 is 40-60%, the content of Al 2O3 is 25-35%, and the content of SO 3 is 4-7%;
The activity index of the steel slag powder 7d is more than or equal to 70 percent.
In a second aspect, the present invention provides a method for preparing the stabilizer, which comprises the following steps:
(1) Grinding the steel slag to obtain steel slag powder with specific surface area more than or equal to 400m 2/kg for later use;
(2) Grinding silicate cement clinker into powder with specific surface area not less than 400m 2/kg for later use;
(3) And respectively weighing the spare steel slag powder and the silicate cement clinker according to the proportion of the raw materials, weighing the slag powder, the alkaline residue, the coking desulfurization ash and the CFB fly ash, adding the grinding aid, mixing and grinding to obtain the stabilizer.
Further, in the step (3), the grinding aid comprises one or more of triethanolamine, polyalcohol amine, triisopropanolamine and glycol.
In a third aspect, the present invention provides the use of a stabiliser as described above in a road underlayment.
Compared with the prior art, the invention has at least one of the following beneficial effects:
(1) The raw materials for preparing the residue soil stabilizer are mainly industrial waste residues, the industrial solid waste is utilized, the recycling utilization rate of the industrial solid waste is improved, and meanwhile, the conventional cementing materials such as high-carbon-emission cement, lime and the like can be replaced, so that the resource consumption is reduced, the production cost is reduced, the carbon emission is reduced, and the environment is protected; the stabilizer is prepared from the raw materials in a specific proportion, has good mechanical property for stabilizing and separating the dregs, exceeds the application effect of the soil stabilizer taking cement as a matrix, and has the unconfined compressive strength of more than 2.5MPa in 7 days;
(2) In the invention, the slag powder is modified, the surface of the slag powder can be physically adsorbed with the molecular chains of polyethylene glycol and sodium alginate, and in addition, active hydroxyl on the surface of the slag powder can form a hydrogen bond with carboxyl or hydroxyl of the polyethylene glycol and sodium alginate to generate chemical bonding, so that the stability of the slag powder is improved; polyethylene glycol can be used as a surfactant between slag powder and sodium alginate due to flexibility and hydrophilicity, so that the compatibility of the slag powder and the sodium alginate is improved. The introduction of polyethylene glycol can reduce interfacial tension between slag powder and sodium alginate and promote uniform dispersion of the slag powder and the sodium alginate, so that the mechanical strength, compression resistance, stability, activity and reactivity of the slag powder are improved; because the modified slag powder has better mechanical property, activity, stability and other properties, when the modified slag powder is compounded with other raw materials, the formed gel structure is more stable, and the compression resistance is better;
(3) The stabilizing agent has larger specific surface arese:Sub>A, can fully fill the pores among the separated dregs particles, can quickly perform se:Sub>A solidification reaction with the separated dregs to generate C-S-H gel, C-A-H gel, ettringite, hydrated calcium chloroaluminate and zeolite substances, and interweave and overlap each other in the pores in the dregs to wrap and connect the dregs particles, thereby remarkably improving the early strength and stability of the stabilized soil;
(4) The preparation method of the stabilizer adopts a step mixing grinding process, can fully exert the self-grinding function of high-hardness particles, forms a micro ball milling effect, improves the hydration activity of the stabilizer, and reduces grinding energy consumption.
In the invention, the technical schemes can be mutually combined to realize more preferable combination schemes. Additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. The objectives and other advantages of the invention may be realized and attained by the structure particularly pointed out in the written description.
Detailed Description
The invention discloses a stabilizer for separating dregs, which comprises the following raw materials in parts by weight: 40 to 60 parts of slag powder, for example, 40 parts, 42 parts, 44 parts, 46 parts, 48 parts, 50 parts, 52 parts, 54 parts, 56 parts, 58 parts, 60 parts; 10 to 30 parts, for example 10 parts, 12 parts, 14 parts, 16 parts, 18 parts, 20 parts, 22 parts, 24 parts, 26 parts, 28 parts, 30 parts of Portland cement clinker; 10 to 20 parts of caustic sludge, for example, 10 parts, 12 parts, 14 parts, 16 parts, 18 parts, 20 parts; 5 to 15 parts of coked desulfurized fly ash, for example, 5 parts, 7 parts, 9 parts, 11 parts, 13 parts, 15 parts; 5 to 10 parts of CFB fly ash, for example, 5 parts, 6 parts, 7 parts, 8 parts, 9 parts and 10 parts; and 5 to 10 parts of steel slag powder, for example, 5 parts, 6 parts, 7 parts, 8 parts, 9 parts, 10 parts.
Compared with the prior art, the raw materials for preparing the residue soil stabilizer are mainly industrial waste residues, the industrial solid waste is utilized, the recycling utilization rate of the industrial solid waste is improved, and meanwhile, the cement, lime and other cementing materials with traditional high carbon emission can be replaced, so that the resource consumption is reduced, the production cost is reduced, the carbon emission is reduced, and the environment is protected; the stabilizer is prepared from the raw materials in a specific proportion, has good mechanical property for stabilizing and separating the dregs, exceeds the application effect of the soil stabilizer taking cement as a matrix, and has the unconfined compressive strength of more than 2.5MPa in 7 days.
The slag powder is obtained by water quenching (granulating) molten slag discharged from an iron-making blast furnace, drying and grinding; the silicate cement clinker is prepared by grinding raw materials mainly containing CaO and SiO 2、Al2O3、Fe2O3 into fine powder according to a proper proportion, and burning the fine powder until the fine powder is partially smelted to obtain a hydraulic cementing material taking calcium silicate as a main mineral component; the caustic sludge is also commonly called white mud, and is white solid waste generated in the process of producing sodium carbonate by an ammonia-soda process; the coking desulfurization ash is a particle mixture formed in the coking process when coking coal is heated to about 1000 ℃ under the condition of air isolation; the CFB fly ash is the fly ash generated by the power generation of a Circulating Fluidized Bed (CFB) boiler; the steel slag powder is prepared by grinding 0-5mm converter steel slag treated by a hot disintegrating process. The raw materials are mainly industrial waste residues and are all existing raw materials. The stabilizer can improve hydration activity and increase mechanical properties of the stabilizer for stably separating dregs.
In a specific embodiment, the slag powder is modified slag powder, and the modified slag powder is obtained by modifying polyethylene glycol and sodium alginate.
In a specific embodiment, the modified slag powder is prepared by the following method: mixing slag powder, polyethylene glycol, sodium alginate and water, reacting at 190-200deg.C (e.g. 190 deg.C, 192 deg.C, 194 deg.C, 196 deg.C, 198 deg.C, 200 deg.C), drying, and pulverizing to obtain modified slag powder.
Specifically, the mass ratio of slag powder to polyethylene glycol to sodium alginate to water is 3-6:1.2-1.4:0.6-0.8:10.
In the invention, the slag powder is modified, the surface of the slag powder can be physically adsorbed with the molecular chains of polyethylene glycol and sodium alginate, and in addition, active hydroxyl on the surface of the slag powder can form a hydrogen bond with carboxyl or hydroxyl of the polyethylene glycol and sodium alginate to generate chemical bonding, so that the stability of the slag powder is improved; polyethylene glycol can be used as a surfactant between slag powder and sodium alginate due to flexibility and hydrophilicity, so that the compatibility of the slag powder and the sodium alginate is improved. The introduction of polyethylene glycol can reduce interfacial tension between slag powder and sodium alginate and promote the uniform dispersion of the slag powder and the sodium alginate, so that the mechanical strength, compression resistance, stability, activity and reactivity of the slag powder are improved.
In a specific embodiment, the slag powder has a 7d activity index of 70% to 75%, e.g., 70%, 71%, 72%, 73%, 74%, 75%;28d activity index > 95%, e.g. 95%, 96%, 97%, 98%.
Specifically, the modified slag powder contains oxides such as CaO, al 2O3, siO 2 and the like, under the excitation of alkaline environments such as silicate cement clinker, alkali slag, steel slag and the like, OH - with stronger polarity can depolymerize Ca-O bonds, si-O bonds and the like in slag glass bodies to release Ca 2+ and various silicate ions, and the Ca 2+ and the silicate ions are mutually combined to form hydrated calcium silicate C-S-H gel. Because the modified slag powder has better mechanical property, activity, stability and other properties, when the modified slag powder is compounded with other raw materials, the formed gel structure is more stable, and the compression resistance is better;
In a specific embodiment, the CaO content of the portland cement clinker is 60% to 70%, e.g., 60%, 61%, 62%, 63%, 64%, 65%, 66%, 67%, 68%, 69%, 70%; siO 2 content is 20% -30%, for example, 20%, 21%, 22%, 23%, 24%, 25%, 26%, 27%, 28%, 29%, 30%; the Al 2O3 content is 2% -10%, for example, 2%, 3%, 4%, 5%, 6%, 7%, 8%, 9%, 10%.
Specifically, under the excitation of alkaline environment, the silicate cement clinker generates hydration reaction between C 3S、C2S、C3 A and C 4 AF to generate hydrated calcium silicate C-S-H, hydrated C-A-H gel and ettringite, and the silicate cement clinker is cemented to separate slag soil particles and fills the pores among the particles.
In one embodiment, the alkaline residue has a pH of 10 to 12, e.g., 10, 10.5, 11, 11.5, 12, and a water content of 1% or less.
Specifically, the alkaline residue provided by the invention provides an alkaline environment, so that the activity of the slag powder can be stimulated, and Al 2O3 and SiO 2 in the slag powder are fully hydrated to generate hydrated calcium silicate C-S-H and hydrated calcium aluminate C-A-H gel.
In a specific embodiment, the CaO content of the coked desulfurized ash is 60% to 70%, for example, 60%, 61%, 62%, 63%, 64%, 65%, 66%, 67%, 68%, 69%, 70%; the SO 3 content is 3% -7%, for example, 3%, 4%, 5%, 6%, 7%.
Specifically, SO 4 2- with more coking desulfurization ash in the invention can react with calcium aluminate hydrate to generate ettringite, and the pores among separated slag soil particles are filled.
In a specific embodiment, the CFB fly ash has a SiO 2 content of 40% to 60%, e.g., 40%, 42%, 44%, 46%, 48%, 50%, 52%, 54%, 56%, 58%, 60%; al 2O3 content 25% -35%, e.g., 25%, 26%, 27%, 28%, 29%, 30%, 31%, 32%, 33%, 34%, 35%; the SO 3 content is 4% -7%, for example, 4%, 5%, 6%, 7%.
Specifically, the CFB fly ash disclosed by the invention contains high-content SiO 2、SO3, can form a volcanic ash reaction system, has high activity, and can generate hydration reaction to generate a cementing material. The CFB fly ash has loose and porous surface structure, has a certain expansibility after absorbing water, and is beneficial to filling and separating pores among slag soil particles.
In a specific embodiment, the steel slag powder 7d activity index is more than or equal to 70%.
Preferably, the steel slag powder is prepared by sieving steel slag, sieving steel slag with the particle size of 0< 5mm, grinding, and the specific surface area is more than or equal to 400m 2/kg, and the 7d activity index is more than or equal to 70%.
Specifically, as the total content of divalent metal oxides (CaO+MgO+FeO) in the steel slag is more than 70%, the slag powder can be stimulated to generate calcium silicate hydrate C-S-H gel hydrate.
In another specific embodiment of the present invention, a preparation method of the stabilizer is disclosed, including the following steps:
(1) Screening steel slag with the grain diameter of more than 0 and less than or equal to 5mm, and grinding to obtain steel slag powder with the specific surface area of more than or equal to 400m 2/kg for later use;
(2) Grinding silicate cement clinker into powder with specific surface area not less than 400m 2/kg for later use;
(3) And respectively weighing the spare steel slag powder and the silicate cement clinker according to the proportion of the raw materials, weighing the slag powder, the alkaline residue, the coking desulfurization ash and the CFB fly ash, adding the grinding aid, mixing and grinding to obtain the stabilizer.
In a specific embodiment, in the step (3), the grinding aid comprises one or more of triethanolamine, polymeric polyol, polymeric alcohol amine, triisopropanolamine and ethylene glycol.
In a specific embodiment, in the step (3), the mass ratio of the stabilizer to the grinding aid is 660-1000:1.
In a specific embodiment, in the step (3), grinding is performed in a mill, wherein the filling rate of grinding media of the mill is 40% -50%, and the mass ratio of the grinding media is 40-70 mm steel balls: phi 25mm steel section: phi 12mm steel section: phi 6mm steel section=1.0-2.0:1.5-2.5:2.5-3.5: 3.5 to 5.5.
Under the above-mentioned grinding medium filling rate and grinding medium mass ratio, the mechanical force activation effect of the stabilizing agent is enhanced, the fineness is proper, and the particles are uniform.
In a specific embodiment, the stabilizer has a specific surface area of 600 to 700m 2/kg, e.g., ,610m2/kg、620m2/kg、630m2/kg、640m2/kg、650m2/kg、660m2/kg、670m2/kg、680m2/kg、690m2/kg、700m2/kg,, a particle size distribution D90.ltoreq.20 μm, e.g., 19 μm, 18 μm, 17 μm, 16 μm, 15 μm, D50.ltoreq.10 μm, e.g., 9 μm, 8 μm, 7 μm, 6 μm, D20.ltoreq.3 μm, e.g., 2.5 μm, 2 μm, 1.5 μm, 1 μm.
The preparation method of the stabilizer adopts a step mixing grinding process, can fully exert the self-grinding function of high-hardness particles, forms a micro ball milling effect, improves the hydration activity of the stabilizer, and reduces grinding energy consumption. The stabilizing agent prepared by the method has larger specific surface arese:Sub>A, can fully fill the pores among the separated dregs particles, can quickly perform curing reaction with the separated dregs, generates C-S-H gel, C-A-H gel, ettringite, hydrated calcium chloroaluminate and zeolite substances, interweaves and overlaps with each other in the pores in the dregs, wraps and connects the dregs particles, and remarkably improves the early strength and stability of the stabilized soil.
In a preferred embodiment, the stabilizer is incorporated in the separated slag at a level of 4% or more, preferably 4 to 10% such as 4%, 4.5%, 5%, 5.5%, 6%, 6.5%, 7%, 7.5%, 8%, 8.5%, 9%, 9.5%, 10%.
The stabilizer prepared by the method can meet the mechanical properties such as compressive strength and the like of the separated slag soil with less doping amount in the separated slag soil.
Specifically, when the mixing amount of the stabilizer in the separated slag soil is 5%, the unconfined compressive strength of 7 days is more than or equal to 2.5MPa, the water stability coefficient is more than or equal to 0.95, the compressive strength loss is more than or equal to 74.1%, the mass change rate is less than or equal to 2.9%, and the scouring mass loss is less than or equal to 1.81%.
In another embodiment of the present invention, the use of the above-described stabilizer in a road underlayment is disclosed.
The technical scheme of the invention is further explained below by combining specific examples.
Among them, the screening test (for discriminating the type of engineering of the separated muck) and physical properties of the separated muck described in the following examples are shown in tables 1 and 2.
TABLE 1
TABLE 2
Example 1
A stabilizer for separating dregs comprises the following raw materials: 40kg of modified slag powder, 30kg of silicate cement clinker, 10kg of alkali slag, 15kg of coking desulfurization ash, 5kg of CFB fly ash and 10kg of steel slag powder; the modified slag powder is obtained by modifying slag powder through polyethylene glycol and sodium alginate;
the 7d activity index of the slag powder is 70%, and the 28d activity index is 95%;
The content of CaO in the silicate cement clinker is 60%, the content of SiO 2 is 30%, and the content of Al 2O3 is 10%;
the pH value of the alkaline residue is 10, and the water content is 1%;
the content of CaO in the coked desulfurized ash is 60%, and the content of SO 3 is 7%;
The CFB fly ash contains 40% of SiO 2, 35% of Al 2O3 and 4% of SO 3;
The activity index of the steel slag powder 7d is 70%.
The preparation method of the stabilizing agent for separating the dregs in the embodiment comprises the following steps:
(1) Screening steel slag with the grain diameter of 5mm, and grinding to obtain steel slag powder with the specific surface area of 400m 2/kg for later use;
(2) Grinding silicate cement clinker into powder with specific surface area of 400m 2/kg for standby;
(3) The modified slag powder is prepared by the following steps: mixing slag powder, polyethylene glycol, sodium alginate and water according to a mass ratio of 3:1.4:0.6:10, reacting at 190 ℃, drying, and crushing to obtain modified slag powder for later use;
(4) Respectively weighing spare steel slag powder, silicate cement clinker, modified slag powder, alkaline residue, coking desulfurization ash and CFB fly ash according to the proportion of the raw materials, adding a triethanolamine grinding aid, and mixing and grinding in a mill to obtain the stabilizer; wherein the mass ratio of the stabilizer to the grinding aid is 660:1, the filling rate of grinding media of a grinder is 40%, and the mass ratio of the grinding media is a steel ball with the mass ratio of 40 mm: phi 25mm steel section: phi 12mm steel section: phi 6mm steel section = 1.0:2.5:2.5:5.5.
The specific surface area of the stabilizer prepared in the embodiment is 634m 2/kg, the granularity distribution D90 is less than or equal to 19 mu m, D50 is less than or equal to 8 mu m, and D20 is less than or equal to 3 mu m.
Example 2
A stabilizer for separating dregs comprises the following raw materials: 50kg of modified slag powder, 20kg of silicate cement clinker, 15kg of alkaline residue, 10kg of coking desulfurization ash, 7.5kg of CFB fly ash and 7.5kg of steel slag powder; the modified slag powder is obtained by modifying slag powder through polyethylene glycol and sodium alginate;
the 7d activity index of the slag powder is 72.5%, and the 28d activity index is 97%;
The content of CaO in the silicate cement clinker is 65%, the content of SiO 2 is 25%, and the content of Al 2O3 is 6%;
the pH value of the alkaline residue is 11, and the water content is 0.8%;
The content of CaO in the coked desulfurized ash is 65%, and the content of SO 3% is 5%;
The CFB fly ash contains 50% of SiO 2, 30% of Al 2O3 and 5.5% of SO 3;
The activity index of the steel slag powder 7d is 75%.
The preparation method of the stabilizing agent for separating the dregs in the embodiment comprises the following steps:
(1) Screening steel slag with the grain diameter of 1mm, and grinding to obtain steel slag powder with the specific surface area of 450m 2/kg for later use;
(2) Grinding silicate cement clinker into powder with specific surface area of 450m 2/kg for standby;
(3) The modified slag powder is prepared by the following steps: mixing slag powder, polyethylene glycol, sodium alginate and water according to a mass ratio of 4.5:1.2:0.7:10, reacting at 195 ℃, drying, and crushing to obtain modified slag powder for later use;
(4) Respectively weighing spare steel slag powder, silicate cement clinker, modified slag powder, alkaline residue, coking desulfurization ash and CFB fly ash according to the proportion of the raw materials, adding a triethanolamine grinding aid, and mixing and grinding in a mill to obtain the stabilizer; wherein the mass ratio of the stabilizer to the grinding aid is 830:1, the filling rate of grinding media of a grinder is 45%, and the mass ratio of the grinding media is 55mm steel balls: phi 25mm steel section: phi 12mm steel section: phi 6mm steel section = 1.5:2:3:4.
The specific surface area of the stabilizer prepared in the embodiment is 659m 2/kg, the granularity distribution D90 is less than or equal to 18 mu m, D50 is less than or equal to 8 mu m, and D20 is less than or equal to 3 mu m.
Example 3
A stabilizer for separating dregs comprises the following raw materials: 60kg of modified slag powder, 10kg of silicate cement clinker, 20kg of alkali slag, 5kg of coking desulfurization ash, 10kg of CFB fly ash and 5kg of steel slag powder; the modified slag powder is obtained by modifying slag powder through polyethylene glycol and sodium alginate;
The 7d activity index of the slag powder is 75%, and the 28d activity index is 98%;
The content of CaO in the silicate cement clinker is 70%, the content of SiO 2 is 20%, and the content of Al 2O3 is 2%;
The pH value of the alkaline residue is 12, and the water content is 0.7%;
The content of CaO in the coked desulfurized ash is 70%, and the content of SO 3 is 3%;
The CFB fly ash contains 60% of SiO 2, 25% of Al 2O3 and 7% of SO 3;
The activity index of the steel slag powder 7d is 75%.
The preparation method of the stabilizing agent for separating the dregs in the embodiment comprises the following steps:
(1) Screening steel slag with the grain diameter of 2.5mm, and grinding to obtain steel slag powder with the specific surface area of 480m 2/kg for later use;
(2) Grinding silicate cement clinker into powder with specific surface area of 480m 2/kg for standby;
(3) The modified slag powder is prepared by the following steps: mixing slag powder, polyethylene glycol, sodium alginate and water according to a mass ratio of 6:1.2:0.8:10, reacting at 200 ℃, drying, and crushing to obtain modified slag powder for later use;
(4) Respectively weighing spare steel slag powder, silicate cement clinker, modified slag powder, alkaline residue, coking desulfurization ash and CFB fly ash according to the proportion of the raw materials, adding a triethanolamine grinding aid, and mixing and grinding in a mill to obtain the stabilizer; wherein the mass ratio of the stabilizer to the grinding aid is 830:1, the filling rate of grinding media of a grinder is 50%, and the mass ratio of the grinding media is 70mm steel balls: phi 25mm steel section: phi 12mm steel section: phi 6mm steel section = 2.0:1.5:3.5:3.5.
The specific surface area of the stabilizer prepared in the embodiment is 689m 2/kg, the granularity distribution D90 is less than or equal to 20 mu m, D50 is less than or equal to 7 mu m, and D20 is less than or equal to 3 mu m.
Example 4
The stabilizer of this example and the preparation method thereof are the same as those of example 1 except that the modified slag powder is replaced with slag powder without modification treatment.
Example 5
The stabilizer of this example and the preparation method thereof are the same as those of example 2 except that the modified slag powder is replaced with slag powder without modification treatment.
Example 6
The stabilizer of this example and the preparation method thereof are the same as those of example 3 except that the modified slag powder is replaced with slag powder without modification treatment.
Comparative example 1
The stabilizing agent for separating the dregs consists of limestone and fly ash, wherein the mass ratio of the lime to the fly ash is 4:14.
Comparative example 2
A stabilizer for separating dregs in this comparative example comprises P.O32.5 Portland cement.
Comparative example 3
The stabilizer of this example and the preparation method thereof are the same as those of example 1 except that the modified slag powder is removed.
Comparative example 4
The stabilizer of this example and the preparation method thereof are the same as those of example 1 except that alkali residues are removed.
Comparative example 5
A stabilizer for separating soil of this comparative example was the same as in example 1 except that the preparation method of the stabilizer of this comparative example was carried out by directly mixing the raw materials and grinding them in a mill without classification grinding treatment.
Test example 1
To verify that the stabilizers meet the construction requirements for the separated slag, the stabilizers prepared in examples 1 to 6 and comparative examples 1 to 5 were subjected to performance tests, which were designated as test samples 1 to 6 and control samples 1 to 5, respectively. Wherein, each group of samples was subjected to two tests, one group had an amount of 5% in the separated slag soil and the other group had an amount of 10%, and the following properties were respectively tested, and the results are shown in Table 3.
(1) Unconfined compressive Strength test
Uniformly mixing 1500g of separated slag soil and 150g of soil stabilizer according to the test procedure of inorganic binder stabilizing materials for highway engineering (JTGE-2009), and forming a cylindrical test piece with the diameter of phi 100mm by 100 mm; and (3) forming 9 parallel test pieces for each test sample and each control sample, putting the test pieces into a plastic bag, fastening the bag opening, putting the plastic bag into a constant temperature and humidity box with the temperature of 20+/-2 ℃ and the relative humidity of 90%, preserving for 6 days, soaking the plastic bag in water for 1 day, testing the unconfined compressive strength of the stabilized soil for 7 days at the speed of 1mm/min by adopting a pavement strength tester, calculating the average value, and calculating the average value of the 9 test pieces.
(2) Coefficient of Water stability test
Mixing 1500g of separated slag soil and 150g of soil stabilizer uniformly according to the test procedure of inorganic binder stabilizing materials for highway engineering (JTGE-2009), and shapingA cylindrical test piece; every test sample and control sample are molded into 2 groups, 9 parallel test pieces are placed into a plastic bag, the opening of the bag is fastened, the test pieces are placed into a constant temperature and humidity box with the relative humidity of 90% and the temperature of 20+/-2 ℃ for 6 days, then one group of test pieces are taken out and soaked in water for 1 day, the rest group of test pieces are continuously cured, and the stable soil is tested for 7 days of unconfined compressive strength at the speed of 1mm/min by adopting a pavement strength tester. The water stability coefficient is the ratio of the unconfined compressive strength of the immersed test piece to the unconfined compressive strength of the non-immersed test piece.
(3) Freeze thawing test
According to the JTG E51-2009 standard requirement of the test procedure of the inorganic binder stabilizing material of highway engineering, the test piece formed by the test sample and the control sample are maintained for 28 days (soaking water in the last day) respectively under the standard humidity and the temperature; freezing in a low temperature box (-18deg.C) for 16h, and thawing in a water tank at 20deg.C for 8h, which is a freeze thawing cycle. And 5 times of freeze thawing cycles are carried out, the test piece is taken out after the freeze thawing cycles are finished, the compressive strength is weighed, the compressive strength loss of the test piece (the compressive strength of the test piece after N times of freeze thawing cycles/the compressive strength of the comparative test piece (before freeze thawing)) and the mass change rate (the mass of the test piece before the freeze thawing cycles-the mass of the test piece after the freeze thawing cycles)/(the mass of the test piece before the freeze thawing cycles) are calculated.
(4) Anti-scour test
Forming a cylindrical test piece with phi of 150 multiplied by 150mm according to the JTG E51-2009 standard requirement of the test procedure of the inorganic binder stabilizing material of highway engineering; forming 2 groups of test samples and control samples, wherein each group comprises 6 parallel test pieces, putting the test pieces into a plastic bag, fastening the opening of the bag, putting the test pieces into a constant temperature and humidity box with the temperature of 20+/-2 ℃ and the relative humidity of 90% for preserving for 27d, and taking out the test pieces to be soaked in water for 1d; injecting clear water into the flushing barrel, flushing for 30min, pouring the turbid water and flushing substances into the basin carefully after flushing, pouring clear water out after 12h of precipitation, putting the precipitate into a drying oven for drying, then weighing the precipitate mass mf, m0 being the mass of the sample initially weighed, and calculating the flushing mass loss:
TABLE 3 Table 3
It is known from the above table that the performance of the stabilizer of the test samples 1 to 3 is better than that of the test samples 4 to 6 under the same doping amount, because the slag powder is modified, the surface of the slag powder can be physically adsorbed with the molecular chains of polyethylene glycol and sodium alginate, and in addition, the active hydroxyl on the surface of the slag powder can form a hydrogen bond with the carboxyl or hydroxyl of the polyethylene glycol and sodium alginate to generate chemical bonding, so that the stability of the slag powder is improved; polyethylene glycol can be used as a surfactant between slag powder and sodium alginate due to flexibility and hydrophilicity, so that the compatibility of the slag powder and the sodium alginate is improved. The introduction of polyethylene glycol can reduce interfacial tension between slag powder and sodium alginate and promote uniform dispersion of the slag powder and the sodium alginate, so that the mechanical strength, compression resistance, stability, activity and reactivity of the slag powder are improved; because the modified slag powder has better mechanical property, activity, stability and other properties, when the modified slag powder is compounded with other raw materials, the formed gel structure is more stable, and the compression resistance and other properties are better.
Secondly, the unconfined compressive strength of the same stabilizer formula can reach more than 2.5MPa in 7 days at the doping amount of 5%, and the performance of the stabilizer is increased along with the increase of the doping amount. The stabilizers of comparative examples 1 to 5, however, all had an unconfined compressive strength of less than 1.5MPa at 5% loading, indicating that the stabilizers of the present invention had better performance at smaller loading. The stabilizer properties of control samples 3-4 were all worse than test sample 1, indicating that the better properties were only achieved with the stabilizer formulation of the invention.
Finally, the performance of the control sample 5 is poorer than that of the control sample 1, so that the preparation method of the stabilizing agent adopts a step mixing grinding process, the self-grinding effect of high-hardness particles can be fully exerted, a micro ball grinding effect is formed, the hydration activity of the stabilizing agent is improved, and meanwhile, the grinding energy consumption is reduced.
The present invention is not limited to the above-mentioned embodiments, and any changes or substitutions that can be easily understood by those skilled in the art within the technical scope of the present invention are intended to be included in the scope of the present invention.
Claims (10)
1. The stabilizer for separating the dregs is characterized by comprising the following raw materials in parts by weight: 40-60 parts of slag powder, 10-30 parts of silicate cement clinker, 10-20 parts of alkali slag, 5-15 parts of coking desulfurization ash, 5-10 parts of CFB fly ash and 5-10 parts of steel slag powder.
2. The stabilizer for separating slag and soil according to claim 1, wherein the slag powder is modified slag powder, and the modified slag powder is obtained by modifying slag powder with polyethylene glycol and sodium alginate.
3. The stabilizer for separating slag and soil according to claim 2, wherein the modified slag powder is prepared by the following method: mixing slag powder, polyethylene glycol, sodium alginate and water, reacting at 190-200 ℃, drying, and pulverizing to obtain modified slag powder.
4. A stabilizer for separating slag from soil according to claim 3, wherein the mass ratio of slag powder, polyethylene glycol, sodium alginate and water is 3-6:1.2-1.4:0.6-0.8:10.
5. The stabilizer for separating slag and soil according to any one of claims 1 to 4, wherein the 7d activity index of the slag powder is 70% to 75%, and the 28d activity index is not less than 95%;
the content of CaO in the silicate cement clinker is 60-70%, the content of SiO 2 is 20-30%, and the content of Al 2O3 is 2-10%.
6. The stabilizer for separating slag and soil according to any one of claims 1 to 4, wherein the alkaline residue has a pH value of 10 to 12 and a water content of 1% or less;
The content of CaO in the coking desulfurization ash is 60% -70%, and the content of SO 3 is 3% -7%.
7. The stabilizer for separating slag and soil according to any one of claims 1 to 4, wherein the CFB fly ash contains 40 to 60% of SiO 2, 25 to 35% of Al 2O3 and 4 to 7% of SO 3;
The activity index of the steel slag powder 7d is more than or equal to 70 percent.
8. A process for the preparation of a stabiliser as claimed in any one of claims 1 to 7 comprising the steps of:
(1) Grinding the steel slag to obtain steel slag powder with specific surface area more than or equal to 400m 2/kg for later use;
(2) Grinding silicate cement clinker into powder with specific surface area not less than 400m 2/kg for later use;
(3) And respectively weighing the spare steel slag powder and the silicate cement clinker according to the proportion of the raw materials, weighing the slag powder, the alkaline residue, the coking desulfurization ash and the CFB fly ash, adding the grinding aid, mixing and grinding to obtain the stabilizer.
9. The method according to claim 8, wherein in the step (3), the grinding aid comprises one or more of triethanolamine, a polymeric polyol, a polymeric alcohol amine, triisopropanolamine, and ethylene glycol.
10. Use of a stabilizer according to any one of claims 1-7 in a road underlayment.
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