CN116535140A - Low-carbon roadbed filler for casting residue activated agglomeration engineering dregs and preparation method thereof - Google Patents
Low-carbon roadbed filler for casting residue activated agglomeration engineering dregs and preparation method thereof Download PDFInfo
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- CN116535140A CN116535140A CN202310432924.8A CN202310432924A CN116535140A CN 116535140 A CN116535140 A CN 116535140A CN 202310432924 A CN202310432924 A CN 202310432924A CN 116535140 A CN116535140 A CN 116535140A
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- 239000000945 filler Substances 0.000 title claims abstract description 54
- 238000005266 casting Methods 0.000 title claims abstract description 50
- 229910052799 carbon Inorganic materials 0.000 title claims abstract description 40
- 238000005054 agglomeration Methods 0.000 title claims description 9
- 230000002776 aggregation Effects 0.000 title claims description 9
- 238000002360 preparation method Methods 0.000 title abstract description 12
- 239000002689 soil Substances 0.000 claims abstract description 37
- 239000004115 Sodium Silicate Substances 0.000 claims abstract description 35
- 239000002893 slag Substances 0.000 claims abstract description 35
- NTHWMYGWWRZVTN-UHFFFAOYSA-N sodium silicate Chemical compound [Na+].[Na+].[O-][Si]([O-])=O NTHWMYGWWRZVTN-UHFFFAOYSA-N 0.000 claims abstract description 35
- 229910052911 sodium silicate Inorganic materials 0.000 claims abstract description 35
- ODINCKMPIJJUCX-UHFFFAOYSA-N Calcium oxide Chemical compound [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 claims abstract description 30
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 20
- 238000002156 mixing Methods 0.000 claims abstract description 16
- 239000000292 calcium oxide Substances 0.000 claims abstract description 15
- 235000012255 calcium oxide Nutrition 0.000 claims abstract description 15
- 239000010881 fly ash Substances 0.000 claims abstract description 15
- 239000002994 raw material Substances 0.000 claims abstract description 13
- 239000000203 mixture Substances 0.000 claims abstract description 11
- 239000008187 granular material Substances 0.000 claims abstract description 3
- 230000000704 physical effect Effects 0.000 claims abstract description 3
- 238000000034 method Methods 0.000 claims description 17
- 239000000463 material Substances 0.000 claims description 16
- 238000011049 filling Methods 0.000 claims description 10
- 230000000694 effects Effects 0.000 claims description 9
- -1 casting residues Substances 0.000 claims description 8
- 238000004519 manufacturing process Methods 0.000 claims description 6
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 5
- 238000012423 maintenance Methods 0.000 claims description 5
- 230000008569 process Effects 0.000 claims description 5
- 238000001879 gelation Methods 0.000 claims description 3
- 230000006872 improvement Effects 0.000 claims description 3
- 238000010521 absorption reaction Methods 0.000 claims description 2
- 238000002425 crystallisation Methods 0.000 claims description 2
- 230000008025 crystallization Effects 0.000 claims description 2
- 230000005284 excitation Effects 0.000 claims description 2
- 239000008188 pellet Substances 0.000 claims description 2
- 239000004568 cement Substances 0.000 abstract description 10
- 239000002910 solid waste Substances 0.000 abstract description 6
- 230000003213 activating effect Effects 0.000 abstract description 4
- 239000002245 particle Substances 0.000 description 13
- 229920006395 saturated elastomer Polymers 0.000 description 7
- 238000005056 compaction Methods 0.000 description 4
- 230000000052 comparative effect Effects 0.000 description 4
- 238000004064 recycling Methods 0.000 description 4
- 229910000831 Steel Inorganic materials 0.000 description 3
- 239000011575 calcium Substances 0.000 description 3
- 239000010959 steel Substances 0.000 description 3
- 238000003756 stirring Methods 0.000 description 3
- 230000008859 change Effects 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 238000001228 spectrum Methods 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 description 1
- 229910002796 Si–Al Inorganic materials 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 238000003915 air pollution Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 229910052791 calcium Inorganic materials 0.000 description 1
- 238000011278 co-treatment Methods 0.000 description 1
- 239000011362 coarse particle Substances 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 230000018044 dehydration Effects 0.000 description 1
- 238000006297 dehydration reaction Methods 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 230000029087 digestion Effects 0.000 description 1
- 238000004090 dissolution Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000010419 fine particle Substances 0.000 description 1
- 238000005189 flocculation Methods 0.000 description 1
- 230000016615 flocculation Effects 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 239000005431 greenhouse gas Substances 0.000 description 1
- 230000005764 inhibitory process Effects 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 238000012856 packing Methods 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- 238000012216 screening Methods 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
- 238000007711 solidification Methods 0.000 description 1
- 230000008023 solidification Effects 0.000 description 1
- 230000004936 stimulating effect Effects 0.000 description 1
Classifications
-
- 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
-
- 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
- C04B7/00—Hydraulic cements
- C04B7/14—Cements containing slag
- C04B7/147—Metallurgical slag
- C04B7/153—Mixtures thereof with other inorganic cementitious materials or other activators
- C04B7/1535—Mixtures thereof with other inorganic cementitious materials or other activators with alkali metal containing activators, e.g. sodium hydroxide or waterglass
-
- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01C—CONSTRUCTION OF, OR SURFACES FOR, ROADS, SPORTS GROUNDS, OR THE LIKE; MACHINES OR AUXILIARY TOOLS FOR CONSTRUCTION OR REPAIR
- E01C21/00—Apparatus or processes for surface soil stabilisation for road building or like purposes, e.g. mixing local aggregate with binder
-
- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01C—CONSTRUCTION OF, OR SURFACES FOR, ROADS, SPORTS GROUNDS, OR THE LIKE; MACHINES OR AUXILIARY TOOLS FOR CONSTRUCTION OR REPAIR
- E01C3/00—Foundations for pavings
- E01C3/003—Foundations for pavings characterised by material or composition used, e.g. waste or recycled material
-
- 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
- C04B2111/00017—Aspects relating to the protection of the environment
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/00474—Uses not provided for elsewhere in C04B2111/00
- C04B2111/0075—Uses not provided for elsewhere in C04B2111/00 for road construction
-
- 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
- C04B2111/20—Resistance against chemical, physical or biological attack
- C04B2111/27—Water resistance, i.e. waterproof or water-repellent materials
-
- 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
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Structural Engineering (AREA)
- Inorganic Chemistry (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Architecture (AREA)
- Civil Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Road Paving Structures (AREA)
Abstract
The invention discloses a low-carbon roadbed filler of casting residue activated agglomerated engineering dregs and a preparation method thereof. The low-carbon roadbed filler is a granular material comprising 100 parts of engineering slag, 4.5-6 parts of casting residues, 3 parts of quicklime, 3 parts of fly ash, a plurality of parts of sodium silicate and other raw materials; the preparation method comprises the steps of determining the mass portion of sodium silicate according to the physical property of engineering slag soil, carrying out wet mixing on raw materials in a mixer, and carrying out turning and curing on the mixture after the wet mixing to form the low-carbon roadbed filler. The invention combines the advantages of engineering slag soil and casting slag in element content, and realizes the cooperative treatment of two solid wastes; effectively activating casting residues and eliminating the volume instability of the casting residues; the low-carbon roadbed filler with good water resistance is prepared under the condition of not using cement.
Description
Technical Field
The invention belongs to the field of solid waste recycling, and relates to a low-carbon roadbed filler and a preparation method thereof, in particular to a low-carbon roadbed filler of casting residue activated agglomeration engineering slag soil and a preparation method thereof.
Background
The disposal method of engineering muck is mainly landfill, but in recent years, the guidance of the muck disposal method is shifted to resource utilization due to the negative influence of the muck field on land resources, environment and human safety. In the large-scale resource utilization of the dregs, the roadbed engineering can be used as a preferable way for the digestion of the dregs due to the huge demand of the earthwork. However, due to the influence of sources, engineering slag soil has the characteristics of high water content, high plasticity, high water sensitivity and the like, and cannot be directly used as roadbed soil, and the engineering performance of the engineering slag soil is improved by adopting modes such as solidification modification and the like.
In order to improve the soil body performance for being used as roadbed soil, cementing materials such as cement and the like are added into the soil. However, cement production and use is an energy intensive process, bringing about 2t of CO per ton of cement production and use, in addition to air pollution 2 The gas emissions, the cement industry, contributes more than 5% to global greenhouse gases each year. Therefore, the method of improving the performance of engineering slag by using cement is not in line with the current green sustainable development road. The improvement of the soil body performance in a more economical and low-carbon way without using cement is the development direction of the future geotechnical field.
In recent years, solid wastes of steel plants are gradually developed and utilized in cementing materials due to potential chemical activities. The blast furnace slag has good gelation property, and the recycling ratio of the blast furnace slag to the current 30% steel slag utilization rate in China is extremely high. However, in addition to blast furnace slag, slag with poor performance is included in steel slag produced in China over 1 million tons per year. The casting residue is subjected to high-temperature cooling before being produced, so that the activity of the casting residue is low, and the engineering performance of soil cannot be effectively improved. In addition, the casting residues have obvious volume instability, are extremely easy to swell with water to cause structural failure, and can definitely increase the risk of road damage under climate change for dense soil roadbeds which are easy to be affected by rainfall. The defects of the casting residues are not solved effectively at present, and the recycling value of the casting residues is further limited.
Disclosure of Invention
In order to solve the problems in the background technology, the invention aims to provide a low-carbon roadbed filler of casting residue activated agglomeration engineering dregs and a preparation method thereof. The method can prepare the roadbed filler by agglomerating engineering soil after activating the casting residue without using cement, solves the problem of poor stability of the casting residue, and has the advantages of low carbon and environmental protection in the production and use processes.
In order to achieve the above purpose, the present invention provides the following technical solutions:
1. low-carbon roadbed filler of casting residue activated agglomeration engineering dregs:
the low-carbon roadbed filler is a granular material containing engineering slag soil, casting residues, quicklime, fly ash, sodium silicate and other raw materials; the engineering slag soil, casting residue, quicklime, fly ash and sodium silicate are respectively used as a pellet carrier, a gelation supply component, a moisture absorption component, a crystallization growth carrier and an activity excitation water resistance improvement component of the low-carbon roadbed filler.
The sodium silicate is a powdery sodium silicate material, and is used for exciting the activity of casting residues and improving the non-uniformity and the water stability of the filler.
The low-carbon roadbed filler comprises the following raw materials in parts by mass: 100 parts of engineering slag soil, 4.5-6 parts of casting residue, 3 parts of quicklime, 3 parts of fly ash and a plurality of parts of sodium silicate, wherein the specific parts of sodium silicate are calculated according to the property and the dosage of the engineering slag soil.
Preferably, the sodium silicate has a modulus of 2.85.
The content of Ca element in the casting residue is more than 50%, and the maximum grain diameter of the casting residue after screening treatment is not more than 10mm.
2. The preparation method of the low-carbon roadbed filler comprises the following steps:
step 1: firstly, determining the mass parts of raw materials such as engineering slag soil, casting residues, quicklime, fly ash and the like in the low-carbon roadbed filling material according to claim 1, and then determining the mass parts (namely the dosage) of sodium silicate according to the physical properties of the engineering slag soil;
step 2: wet mixing
Sequentially adding all raw materials in the low-carbon roadbed filling into a stirrer, and carrying out mixing wet mixing by using the stirrer in real time to form a mixture;
step 3: turning maintenance
And (3) turning and curing the mixture formed in the step (2) for 4-8 days, and forming the final low-carbon roadbed filling after the turning and curing are completed.
The weight part D of sodium silicate in the step 1 s The method is as follows:
wherein m is s Is the engineering residue soil part, w i The PL is the plastic limit water content of the engineering slag soil.
In the mixing and wet mixing process of the step 1, the addition sequence of the raw materials in the low-carbon roadbed filling is as follows: fly ash, quicklime, casting residue, sodium silicate and engineering residue soil.
In particular, the time interval between adding any two materials into the stirrer except for the mixing of the fly ash and the quicklime is not less than 1/2 of the time interval between adding any two materials into the stirrer. Preferably, the mixing and stirring time of the fly ash and the quicklime is 90s.
The invention adopts casting residue to achieve the following purposes: (1) make up for the defect of Ca deficiency in the dregs; (2) reducing the inhibition of flocculation of soil particles to dehydration.
The invention adopts sodium silicate and definite doping amount to achieve the following purposes: (1) activating the activity of casting residues; (2) Fine particles are bonded and part of coarse particles are dispersed, so that the non-uniformity of the filler is improved, and the filler is easy to compact; (3) Stimulating the dissolution of free calcium in casting residue and promoting the agglomeration of residue soil; (4) The hydrate is stimulated to develop into a film on the surface of the particles, so that the water stability and the weather resistance of the filler are improved.
The invention adopts 4-8 days of turning maintenance to achieve the following purposes: (1) Reducing the water content of the filler and improving the homogeneity of the mixture; (2) The unstable substances in the casting residues are fully reacted during the period, and the volume expansion of the filling in the service period is eliminated.
The invention takes engineering slag soil as a main raw material, and prepares the filler for roadbed engineering by cooperatively casting other materials such as slag, sodium silicate and the like. The activity of casting residue and the water resistance of the filler are improved through the action effect of sodium silicate; wet mixing, throwing and curing for a certain period of time in the preparation process are used for reducing the water content of the filler, eliminating the volume instability of casting residues and improving the stability of the filler. Simultaneously, the advantages of engineering slag soil and casting slag in element content are combined, and the two solid wastes are cooperatively treated; effectively activating casting residues and eliminating the volume instability of the casting residues; the low-carbon roadbed filler with good water resistance is prepared under the condition of not using cement.
The beneficial effects of the invention are as follows:
1. the co-treatment of two solid wastes of casting residue and dregs is realized, and the resource pressure caused by the piling and filling of the two solid wastes is relieved;
2. the cost and the related carbon emission caused by using commercial cementing materials (such as cement) in roadbed engineering are reduced;
3. the problems of strength damage, structure deterioration and the like caused by volume instability in the recycling application process of casting residues are effectively solved;
4. the mixing proportion can be rapidly calculated and adjusted aiming at different dregs (different water contents and plastic limit water contents), so that the production efficiency and quality of the filler are ensured.
Drawings
FIG. 1 is a microstructure of a roadbed filler prepared according to the technical scheme of the present invention;
FIG. 2 is a graph of the energy spectrum of the roadbed filler;
FIG. 3 is an unconfined compressive strength plot of a roadbed filler.
Detailed Description
The technical solutions of the present invention will be clearly and completely described in connection with the embodiments, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the present invention without making any inventive effort, are intended to fall within the scope of the present invention.
Example 1
A preparation method of a low-carbon roadbed filler of casting residue activated agglomeration engineering dregs comprises the following materials in parts by weight: 100 parts of engineering slag, 6 parts of casting residue, 3 parts of quicklime and 3 parts of fly ash.
According to the property of engineering slag soil, the mass portions of sodium silicate are obtained: the initial water content of the engineering slag soil is 60 percent, the plastic limit water content is 20.3 percent, and the obtained sodium silicate dosage D s In the range of 0.19.ltoreq.D s Less than or equal to 0.6 part.
The raw materials are put into a stirrer for stirring according to the following sequence: 3 parts of fly ash, 3 parts of quicklime, 6 parts of casting residues, 0.2 part of sodium silicate (in the calculated range) and 100 parts of engineering residue soil.
And after all the raw materials are stirred, turning and curing are carried out on the mixture formed by stirring for 5 days, and the final low-carbon roadbed filler is formed after the turning and curing are finished.
After the preparation of the low-carbon roadbed filler is finished, the non-uniformity coefficient of particles in the low-carbon roadbed filler is 10.65, and the low-carbon roadbed filler belongs to a material with good grading; after compacting the low carbon subgrade filler, the 7 day standard-raised unconfined compressive strength is 325kPa, the 7 day saturated unconfined compressive strength is 302kPa, and the 28 day standard-raised unconfined compressive strength is 350kPa.
Example 2
This embodiment is substantially the same as embodiment 1 except that: the amount of sodium silicate was 0.3 part (in the calculated range) and the turndown maintenance time of the mixture was 4 days.
After the filler is prepared, the non-uniformity coefficient of the particles is 8.2, and the particles belong to a material with good quasi-grading; after compaction of the filler, the 7 day standard unconfined compressive strength was 712kPa, the 7 day saturated unconfined compressive strength was 399 kPa, and the 28 day standard unconfined compressive strength was 613kPa.
Example 3
This embodiment is substantially the same as embodiment 1 except that: the amount of sodium silicate was 0.6 part (in the calculated range) and the flip-flop curing time of the mixture was 4 days.
The microstructure and energy spectrum of the low-carbon roadbed filler prepared by the method are shown in figures 1-2, and the filler particles are very compact in structure and difficult to erode by water; a good Ca-Si-Al ternary gel system is formed on the components, and the bonding among particles is enhanced.
After the filler is prepared, the non-uniformity coefficient of the particles is 10.72, and the particles belong to a material with good quasi-grading; after compaction of the filler, the 7 day standard unconfined compressive strength was 1390kPa, the 7 day saturated unconfined compressive strength was 1254kPa, and the 28 day standard unconfined compressive strength was 2035kPa.
In order to highlight the technical effects of the present invention, the present invention also provides the following comparative examples:
comparative example 1
This embodiment is substantially the same as embodiment 1 except that: the amount of sodium silicate used was 0 part (below the calculated range) and the flip-flop maintenance time of the mixture was 6 days.
After the filler is prepared, the non-uniformity coefficient of the particles is 3.95, and the particles belong to poor grading materials; after packing compaction, 7 days of standard unconfined compressive strength was 173kPa,7 days of saturated unconfined compressive strength was 147kPa, and 28 days of standard unconfined compressive strength was 159kPa.
Comparative example 2
This embodiment is substantially the same as embodiment 1 except that: the sodium silicate amount was 1.2 parts (above the calculated range) and the mix was turned over for 4 days.
After the filler is prepared, the non-uniformity coefficient of the particles is 11.59, and the particles belong to a material with good grading; after compaction of the filler, 7 days of standard-support unconfined compressive strength was 344kPa,7 days of saturated unconfined compressive strength was 183kPa, and 28 days of standard-support unconfined compressive strength was 195kPa.
In the above embodiment, the fillers prepared according to the preparation method are all of good graded materials, as shown in fig. 3, the 7-day saturated unconfined compressive strength is 302 (0.2 part of sodium silicate) to 1254 (0.6 part of sodium silicate) kPa, and the 28-day standard unconfined compressive strength is 350 (0.2 part of sodium silicate) to 2035 (0.6 part of sodium silicate) kPa; in contrast, the fillers of the comparative examples were not prepared according to the method, and had poor gradation, the 7-day saturated unconfined compressive strength was only 147 (sodium silicate 0 part) to 183 (sodium silicate 1.2 part) kPa, and the 28-day standard unconfined compressive strength was 159 (sodium silicate 0 part) to 195 (sodium silicate 1.2 part) kPa. It can be seen that the filler and method have significant advantages in ensuring grading, strength and water stability.
While the embodiments and results of the present invention have been described in detail in the foregoing embodiments, the scope of the invention is not limited thereto, and any person skilled in the art who is skilled in the art should substitute or change the technical solution of the present invention and its inventive concept within the scope of the present invention.
Claims (6)
1. A low-carbon roadbed filler of casting residue activated agglomeration engineering dregs is characterized in that:
the low-carbon roadbed filler is a granular material containing engineering slag soil, casting residues, quicklime, fly ash and sodium silicate; the engineering slag soil, casting residue, quicklime, fly ash and sodium silicate are respectively used as a pellet carrier, a gelation supply component, a moisture absorption component, a crystallization growth carrier and an activity excitation water resistance improvement component of the low-carbon roadbed filler.
2. The low carbon subgrade filler of casting residue activated agglomerate engineering slag soil as claimed in claim 1, wherein:
the low-carbon roadbed filler comprises the following raw materials in parts by mass: 100 parts of engineering slag, 4.5-6 parts of casting residue, 3 parts of quicklime and 3 parts of fly ash.
3. A low-carbon roadbed filler of casting residue activated agglomeration engineering dregs is characterized in that:
the content of Ca element in the casting residue exceeds 50%, and the maximum grain size of the casting residue is not more than 10mm.
4. A method for preparing a low carbon subgrade filler suitable for use in any one of claims 1-3, comprising the steps of:
step 1: firstly, determining the mass parts of engineering slag soil, casting residues, quicklime and fly ash in the low-carbon roadbed filling material according to claim 1, and then determining the mass parts of sodium silicate according to the physical properties of the engineering slag soil;
step 2: wet mixing
Sequentially adding all raw materials in the low-carbon roadbed filling into a stirrer, and carrying out mixing wet mixing by using the stirrer in real time to form a mixture;
step 3: turning maintenance
And (3) turning and curing the mixture formed in the step (2) for 4-8 days, and forming the final low-carbon roadbed filling after the turning and curing are completed.
5. A method of manufacture as defined in claim 4, wherein:
the weight part D of sodium silicate in the step 1 s The method is as follows:
wherein m is s Is the engineering residue soil part, w i The PL is the plastic limit water content of the engineering slag soil.
6. A method of manufacture as defined in claim 4, wherein:
in the mixing and wet mixing process of the step 1, the addition sequence of the raw materials in the low-carbon roadbed filling is as follows: fly ash, quicklime, casting residue, sodium silicate and engineering residue soil.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202310432924.8A CN116535140B (en) | 2023-04-21 | 2023-04-21 | Low-carbon roadbed filler for casting residue activated agglomeration engineering dregs and preparation method thereof |
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| CN202310432924.8A CN116535140B (en) | 2023-04-21 | 2023-04-21 | Low-carbon roadbed filler for casting residue activated agglomeration engineering dregs and preparation method thereof |
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| CN116535140B CN116535140B (en) | 2024-06-07 |
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| KR20070024896A (en) * | 2005-08-31 | 2007-03-08 | 주식회사 케이.알.티 | Csa soil solidifying material using ladle furnace slag |
| CN101928807A (en) * | 2010-08-13 | 2010-12-29 | 武汉钢铁(集团)公司 | Method for refining high carbon molten steel by using low aluminum steel casting residue |
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