CN117263638A - Graphite tailing-saw mud road subbase layer material and preparation method and application thereof - Google Patents

Graphite tailing-saw mud road subbase layer material and preparation method and application thereof Download PDF

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CN117263638A
CN117263638A CN202311183722.0A CN202311183722A CN117263638A CN 117263638 A CN117263638 A CN 117263638A CN 202311183722 A CN202311183722 A CN 202311183722A CN 117263638 A CN117263638 A CN 117263638A
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parts
graphite
saw mud
saw
phase
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程新
贾坚
卢晓磊
李香祖
于海平
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Qingdao New Journey Foundation Materials Technology Co ltd
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Qingdao New Journey Foundation Materials Technology 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
    • C04B28/14—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing calcium sulfate cements
    • C04B28/142—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing calcium sulfate cements containing synthetic or waste calcium sulfate cements
    • 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
    • C04B18/12—Waste materials; Refuse from quarries, mining or the like
    • 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
    • C04B18/142—Steelmaking slags, converter 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
    • C04B22/00—Use of inorganic materials as active ingredients for mortars, concrete or artificial stone, e.g. accelerators, shrinkage compensating agents
    • C04B22/06—Oxides, Hydroxides
    • C04B22/062—Oxides, Hydroxides of the alkali or alkaline-earth metals
    • C04B22/064—Oxides, Hydroxides of the alkali or alkaline-earth metals of the alkaline-earth metals
    • 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
    • C04B22/00—Use of inorganic materials as active ingredients for mortars, concrete or artificial stone, e.g. accelerators, shrinkage compensating agents
    • C04B22/08—Acids or salts thereof
    • C04B22/16—Acids or salts thereof containing phosphorus in the anion, e.g. phosphates
    • 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
    • C04B24/16—Sulfur-containing compounds
    • 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
    • C04B40/00—Processes, in general, for influencing or modifying the properties of mortars, concrete or artificial stone compositions, e.g. their setting or hardening ability
    • C04B40/0028—Aspects relating to the mixing step of the mortar preparation
    • C04B40/0039—Premixtures of ingredients
    • 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
    • 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
    • E01C3/04—Foundations produced by soil stabilisation
    • 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
    • E01C3/06—Methods or arrangements for protecting foundations from destructive influences of moisture, frost or vibration
    • 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
    • C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
    • C04B2201/50—Mortars, concrete or artificial stone characterised by specific physical values for the mechanical strength
    • 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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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Ceramic Engineering (AREA)
  • Structural Engineering (AREA)
  • Materials Engineering (AREA)
  • Organic Chemistry (AREA)
  • Civil Engineering (AREA)
  • Environmental & Geological Engineering (AREA)
  • Inorganic Chemistry (AREA)
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  • Chemical Kinetics & Catalysis (AREA)
  • Mining & Mineral Resources (AREA)
  • Combustion & Propulsion (AREA)
  • Road Paving Structures (AREA)

Abstract

The invention relates to the technical field of comprehensive utilization of industrial solid wastes, in particular to a graphite tailing-saw mud road subbase layer material and a preparation method and application thereof, and the graphite tailing-saw mud road subbase layer material comprises the following components in parts by weight: 40-55 parts of graphite tailings, 45-60 parts of saw mud, 0.5-2 parts of phase-change microcapsules, 5-10 parts of slaked lime, 10-20 parts of fly ash, 0.5-1.5 parts of titanium gypsum, 0.5-2 parts of steel slag powder, 5-15 parts of water and 0.05-0.2 part of dispersing agent; the 7d unconfined compressive strength range of the graphite tailing-sawing mud road subbase layer material is 2.64-3.87MPa, and the compressive strength loss rate (BDR) range is 82.1-86.2%. The drying shrinkage and temperature shrinkage performance of the subbase material are optimized by using the cementing material titanium gypsum with micro-expansion characteristic and the steel slag powder to solidify graphite tailing-saw mud, and the freezing resistance of the subbase material is improved by adding the phase-change microcapsule.

Description

Graphite tailing-saw mud road subbase layer material and preparation method and application thereof
Technical Field
The invention relates to the technical field of comprehensive utilization of industrial solid wastes, in particular to a graphite tailing-saw mud road subbase layer material, and a preparation method and application thereof.
Background
Graphite tailings are industrial slag discharged during the production of graphite. So far, the accumulated amount of graphite tailings in China is over 1 hundred million tons. The stacking of the graphite tailings occupies a large amount of land, and the weathering phenomenon is serious in the long-term stacking process because the granularity of the graphite tailings is small, so that secondary dust is easy to generate, and the atmospheric environment is polluted; in addition, the pH value of the graphite tailings is only 3-4, and the dissolution of acidic substances also easily pollutes groundwater, so that soil is acidic.
The sawing mud is waste such as stone powder generated in the cutting process of granite stone, and the main minerals are feldspar and quartz, and meanwhile SiO 2 、Al 2 O 3 、Na 2 O、K 2 The oxide content such as O is higher. The stone material is cooled by using an aqueous solution containing additives such as lubricant and the like in the processing process, and the stone powder is added with coagulant, flocculant and the like in a sedimentation tank to carry out sedimentation treatment, and the sediment is sawing mud.
The industrial solid wastes such as graphite tailings, saw mud and the like increase the technical difficulty of secondary utilization due to the characteristics of additive doping, poor self-reaction activity and the like in the production process. At present, although the research is carried out on using graphite tailings and saw mud to replace a small part of fine aggregate for producing concrete, the defect of small replacement amount of the fine aggregate exists.
Related researches on the preparation of highway subbing layer by using graphite tailings have been carried out by the prior researchers, such as the literature (Fang Jianguo, yao Zhanyong, su Gongcan, et al, university of Shandong, et al, 2003, (5): 562-567) disclose the feasibility of using cement stabilized graphite tailings as highway pavement subbing layer, and experiments prove that when cement and graphite tailings are used for preparing subbing layer materials, the maximum shrinkage strain reaches 1657-2127 x 10 in seven days under the conditions of natural air drying, standard curing and water spraying curing -6 Even if the water is sprayed for health maintenance, the maximum shrinkage strain value is high for seven days, and the water is used as an underlayment material, so that the risk exists. The flotation agent is added in the flotation process of the graphite ore, so that the graphite tailings after plate and frame filter pressing have lower pH value, the plasticity of the graphite tailings is poor, and the graphite tailings can be classified into 'tailing gravel sand' according to the properties of the graphite tailings, so that the defects of poor crack resistance, poor freezing resistance and the like caused by large consumption of the traditional cement cementing material during solidification are overcome.
There are few studies on application of graphite tailings-sawing sludge in roadbed materials at present, but when the graphite tailings-sawing sludge is applied to pavement base materials, the following defects inherent to stable fine-grained materials exist based on the prior studies: the dry shrinkage and the thermal shrinkage are larger than those of the common base material (cement stabilized macadam), so that the strength of the pavement base cannot be ensured; the asphalt pavement has the advantages of high water absorption, insufficient freezing resistance and scouring resistance, and easiness in causing diseases such as cracking, pumping and the like of the asphalt pavement.
Therefore, the strength of the graphite tailing-saw mud road base material is ensured, the water absorption is reduced, and the frost resistance and the scour resistance of the graphite tailing-saw mud road base material are improved, so that the method is a precondition for realizing wide application of the graphite tailing-saw mud road base material.
Disclosure of Invention
The invention aims to solve the defects of the prior art, and provides a road subbase material based on graphite tailing-sawing mud, a preparation method and application thereof, and the drying shrinkage and temperature shrinkage performance of the subbase material are optimized by solidifying the graphite tailing-sawing mud by using a cementing material with micro-expansion characteristics, and meanwhile, the freezing resistance of the subbase material is improved by adding phase change microcapsules.
In order to achieve the technical effects, the invention adopts the following technical scheme:
the graphite tailing-saw mud road subbase layer material comprises the following components in parts by weight: 40-55 parts of graphite tailings, 45-60 parts of saw mud, 0.5-2 parts of phase-change microcapsules, 5-10 parts of slaked lime, 10-20 parts of fly ash, 0.5-1.5 parts of titanium gypsum, 0.5-2 parts of steel slag powder, 5-15 parts of water and 0.05-0.2 part of dispersing agent;
the 7d unconfined compressive strength range of the graphite tailing-saw mud road subbase layer material is 2.64-3.87MPa, and the compressive strength loss rate (BDR) range is 82.1-86.2%.
The action mechanism of the graphite tailing-saw mud road subbase layer material provided by the invention mainly comprises the following steps:
(1) The proportion of the graphite tailings and the saw mud in the base material, namely the substitution amount of the fine aggregate, is far greater than that of the prior art, and meanwhile, the characteristics of large particle diameter difference of the graphite tailings and the saw mud are utilized, so that the optimal blending proportion of the graphite tailings and the saw mud is reasonably determined by closely stacking the multi-scale solid particles, the strength of the prepared base material is effectively ensured, and the BDR range is obviously improved;
(2) Aiming at the defects of dry shrinkage and large temperature shrinkage existing when the cement inorganic cementing material stabilizes the fine particle material, the CaSO in the titanium gypsum is utilized by using industrial solid waste titanium gypsum and steel slag 4 ·2H 2 Generating AFt by the volcanic ash reaction product of O and lime fly ash, and inhibiting shrinkage of the base material; the shrinkage of the subbase material is compensated by utilizing the characteristics of slow hydration reaction speed, volume expansion and the like of f-CaO and MgO in the steel slag;
(3) By Fe (OH) contained in titanium gypsum 3 、Al(OH) 3 The colloid adsorbs heavy metal ions in the graphite tailings.
Preferably, the phase-change microcapsule comprises a shell and a core material, wherein the shell is made of silica aerogel, the core material is made of polyethylene glycol, and the particle size of the phase-change microcapsule ranges from 15 mu m to 25 mu m.
The phase change microcapsule mainly has the following functions: (1) The phase change material changes phase and releases certain heat in the temperature decreasing process in winter, so that the freeze-thawing resistance of the graphite tailing-saw mud roadbed material is improved; the phase change microcapsule has lower heat conductivity coefficient, and delays the whole temperature drop of the roadbed material; (2) The phase change material can absorb part of heat in summer with higher temperature, so that temperature shrinkage caused by too high temperature rising rate is avoided, and the temperature shrinkage cracks of the pavement base layer are reduced; (3) SiO (SiO) 2 The aerogel shell material is beneficial to the volcanic ash reaction and hydration reaction in the whole reaction system; (4) Even if a small amount of phase-change microcapsules are damaged, the influence degree of core polyethylene glycol on the pozzolanic reaction is small; (5) The phase change microcapsule is C in the steel slag powder to a certain extent 2 S、C 3 Hydration of S provides nucleation sites that facilitate the progress of the hydration reaction.
In SiO form 2 The phase-change microcapsule taking aerogel as a shell material and polyethylene glycol as a core material greatly improves the freeze thawing resistance of the roadbed material, and the microcapsule supplements the solid accumulation with nano-scale particle size, and SiO 2 The aerogel is beneficial to the volcanic ash reaction and hydration reaction in the whole reaction system.
Preferably, the preparation method of the phase-change microcapsule comprises the following steps:
uniformly mixing 0.5-0.8 part of polysorbate-80 and 0.6-0.8 part of span-80 surfactant to form a solution A, and dissolving 10-15 parts of polyethylene glycol in 100 parts of toluene solution to form a solution B. Then adding the solution A into the solution B, and stirring for 30 minutes at the rotating speed of 400-700r/min under the water bath condition of 50 ℃ to form stable emulsion; then adding 0.1-0.3 part of acetic acid and 10-13 parts of ethyl orthosilicate into the stable emulsion, and heating to 55 ℃ for polymerization reaction for 3 hours to obtain the product. And finally, washing with absolute ethyl alcohol for 2-3 times, then washing with deionized water, and carrying out suction filtration to obtain the phase-change microcapsule.
Preferably, the particle size of the graphite tailings is in the range of 0-9.5mm, wherein the particle size of the graphite tailings is less than 30% and less than 0.3 mm; the grain diameter of the saw mud material is less than or equal to 0.3mm.
Graphite tailings and saw mud with different particle sizes are adopted for matching use, and the main functions are as follows: (1) The reasonable mixing amount of the two industrial solid waste particles is determined by utilizing the different particle sizes of the two industrial solid waste particles, so that the close packing of the multi-scale solid particles is realized, and the strength of the multi-scale solid particles is ensured; (2) And the plasticity indexes of the two industrial solid wastes are regulated and controlled, so that the construction is easy.
Preferably, the slaked lime grade is national standard grade II ash and above. The lime has the main functions of: (1) Volcanic ash reaction with fly ash to produce hydration products AFt, C-A-S-H gel and the like to provide strength; (2) Lime hydrate is used to improve the alkalinity of a reaction system, excite the potential activity of steel slag and improve the strength; (3) Part Ca (OH) 2 The pore structure of the compacted base material is refined through carbonization reaction, so that the durability of the graphite-saw mud is improved.
Preferably, the fly ash is national standard grade II ash and above. The fly ash mainly has the following functions: (1) Providing silicon-aluminum minerals required by volcanic ash reaction, and improving strength; (2) The fly ash has fine granularity, and the liquid-plastic limit after the graphite-saw mud is mixed is adjusted, so that the construction rolling compaction is convenient.
Preferably, caSO in the titanium gypsum 4 ·2H 2 The O content is more than or equal to 70 weight percent. The titanium gypsum has the following main functions: (1) CaSO in titanium gypsum 4 ·2H 2 O can be used for promoting hydration products of lime and fly ash to produce ettringite (AFt) and simultaneously with C in steel slag powder 2 S、C 3 S can generate AFt, so that shrinkage caused by hydration of cement can be prevented to a certain extent due to the volume expansibility of the AFt; (2) Titanium gypsum contains a certain amount of Fe (OH) 3 、Al(OH) 3 The colloid can absorb heavy metal ions contained in graphite tailings and saw mud to a certain extent; (3) The titanium gypsum can slow down the hydration reaction process of the cementing material, prolong the initial final setting time of the cementing material, and is beneficial to slowing down the problem that the compactness is affected by hydration hardening in the construction process of the base material.
Preferably, the fineness of the steel slag powder is more than or equal to 300 meshes. The steel slag powder contains a certain amount of CaO, mgO and C 3 S and C 2 S and active silicon-aluminum minerals, caO content is 30-40%, mgO content is 3-5%, C 3 S content of 20-25％，C 2 The content of S is 35-45%, and the rest is active silicon-aluminum mineral. When the steel slag powder is applied to cement concrete, the cement concrete is cracked due to the delayed hydration of CaO. But when applied to the cured graphite tailing-sawing mud material as an underlayment, the following functions can be achieved: (1) Since CaO has a slow hydration rate after water is added, ca (OH) is generated by hydration 2 The volume of the inorganic cementing material is expanded, and a small amount of CaO has a certain compensation effect on the dry shrinkage and the temperature shrinkage of the inorganic cementing material stable fine-grained material; however, excessive CaO can cause expansion cracking of the base layer, so that the optimal mixing amount range of the steel slag powder is controlled to be 0.5-2 parts; (2) The Si-O, al-O compact glass body on the surface of the ground steel slag powder is destroyed to form C with gelling activity 3 S、C 2 S, hydration reaction occurs after the contact with water in the preparation process, so that the reactivity is fully activated, and the strength is provided for the subbase layer material.
Preferably, the dispersing agent consists of sulfonated oil, sodium tripolyphosphate and sodium pyrophosphate, wherein the mass ratio of the dispersing agent to the sodium pyrophosphate is 75-85%, 5-10% and 10-15%.
The dispersant mainly has the following functions: (1) The dispersing agent can reduce the zeta potential of the surface of the phase-change microcapsule, reduce the surface energy of particles, avoid the agglomeration phenomenon of the phase-change microcapsule in the solution, and ensure that the phase-change microcapsule is uniformly distributed in the solution; (2) The sulfonated oil has a hydrophilic head and a hydrophobic tail, the hydrophilic head can be adsorbed on the surface of graphite tailing-saw mud, the hydrophobic tail can prevent water from entering outwards, and the water erosion resistance of the base material is improved; the sulfonated oil has the characteristics of hydrophilic end and hydrophobic end, after being added into the base material, the hydrophilic head is adsorbed on the surface of graphite-saw mud particles, and the hydrophobic tail outwards reduces the water absorption rate of the base material, so that the water scouring resistance of the base material is improved; (3) Sodium tripolyphosphate has the effect of chelating metal ions, and sodium pyrophosphate has the effect of complexing heavy metal ions and has the effect of solidifying the metal ions in tailings; (4) Because the dispersing agent can complex calcium ions and aluminum ions of the cementing material dissolved in the pore solution, the ion concentration in the pore solution is reduced, and the cementing material (C) is further promoted 2 S、C 3 S, etc.), is advantageous in dissolution and hydrationAnd the early strength of the solid waste pavement base layer is improved.
The invention also provides a preparation method of the graphite tailing-saw mud road subbase layer material, which comprises the following steps:
s1, adding a dispersing agent into mixing water, and stirring for 2-5min to prepare a dispersion liquid A. The addition of the dispersing agent can avoid the agglomeration phenomenon of the phase-change microcapsule, and is beneficial to the dispersion of the phase-change microcapsule in the aqueous solution.
S2, adding phase-change microcapsules into the dispersion liquid A, dispersing for 5-10min by using an ultrasonic disperser, and stirring for 2-5min to obtain a solution B. The microcapsule materials can be better and uniformly distributed in water by using ultrasonic dispersion, and the flocculation and sedimentation phenomena of the microcapsule materials are avoided.
S3, uniformly stirring saw mud, graphite tailings, slaked lime, fly ash, titanium gypsum and steel slag powder, adding the solution B, and continuously stirring for 1.5-3min to obtain the cured graphite tailings-saw mud roadbed material.
In the preparation method provided by the invention, the microcapsule materials can be dispersed more uniformly by using means such as dispersing agents, ultrasonic dispersion and the like, so that the agglomeration phenomenon of the microcapsule materials is avoided, and the promotion effect of the microcapsule materials on pozzolan reaction and hydration reaction in a reaction system is further ensured.
The invention also provides application of the graphite tailing-saw mud road subbase material, which is particularly applied to subbase of secondary and lower roads.
Compared with the prior art, the invention has the following beneficial effects:
1. the invention provides an antifreezing graphite tailing-saw mud road subbase material suitable for cold areas, which has larger fine aggregate substitution quantity, ensures the strength and has the characteristic of micro expansion, and compensates the shrinkage caused by the change of drying and temperature; aiming at the defects of dry shrinkage and large temperature shrinkage of inorganic cementing material stable fine-grained materials, industrial solid wastes such as titanium gypsum, steel slag and the like are used, and CaSO in the titanium gypsum is utilized 4 ·2H 2 Generating AFt by the volcanic ash reaction product of O and lime fly ash, and inhibiting shrinkage of the AFt; the characteristics of slow hydration reaction speed, volume expansion and the like of the f-CaO and MgO in the steel slag are utilized to compensateShrinkage of the subbing layer material; and the addition of the phase change microcapsule greatly improves the frost resistance of the roadbed, and is particularly suitable for constructing the roadbed of the road in the northern cold region of China.
2. The frost-resistant graphite tailing-saw mud road subbase material provided by the invention can be used for replacing common road subbase material cement stabilized macadam, so that the problem of sand and stone shortage in the engineering construction process is greatly relieved, and meanwhile, fe (OH) contained in titanium gypsum is utilized 3 、Al(OH) 3 The colloid adsorbs heavy metal ions in the graphite tailings, which is beneficial to protecting ecological environment.
3. In the preparation method provided by the invention, the microcapsule materials can be dispersed more uniformly by using means such as dispersing agents, ultrasonic dispersion and the like, so that the agglomeration phenomenon of the microcapsule materials is avoided, and the promotion effect of the microcapsule materials on pozzolan reaction and hydration reaction in a reaction system is further ensured.
Drawings
FIG. 1 is a schematic representation of the base material prepared in example 3 after freeze thawing;
FIG. 2 is a schematic representation of the base material of comparative example 6 after freeze thawing.
Detailed Description
The invention will be further described with reference to the accompanying drawings and examples.
In the following examples and comparative examples, graphite tailings were derived from a graphite tail mine piled up in the Qingdao city of Shandong province, and saw sludge was derived from a waste saw sludge piled up in the Qingdao city; the fly ash is grade II ash produced by suburban thermal power plants in the North and the south of the province; the slaked lime is grade III ash produced by Jinan Baud metallurgical limestone limited company, and aluminum salt, magnesium salt and calcium salt are all purchased from national medicine group chemical reagent limited company and are of analytical grade; the sulfonated oil is sodium castor oil sulfonate, and is purchased from Shandong Linyi Lvsen chemical industry; sodium tripolyphosphate and sodium pyrophosphate are both purchased from the morning sun chemical industry of Shandong Weifang.
The experimental procedure was performed according to the Highway engineering inorganic binder stabilization Material test protocol (JTG E51-2009). The following strengths are seven-day unconfined compressive strengths, and the compressive strength loss rate (BDR) is the compressive strength ratio of the test piece before and after freezing and thawing according to the standard in a freezing and thawing experimental scheme; the unconfined compressive strength of 7d is that the test piece is put into a standard curing box for curing for 6 days, and the final 1 day is soaking curing; the dry shrinkage was based on continuous monitoring of shrinkage strain for 30 d.
The heavy metal ion elution is carried out according to the method for measuring leachable heavy metal in cement mortar (GB/T30810-2014), and the content of the heavy metal ion is hexavalent cadmium ion and copper ion.
Example 1
The graphite tailing-saw mud road subbase layer material consists of the following components in parts by mass: 45 parts of saw mud, 55 parts of graphite tailings, 5 parts of slaked lime, 10 parts of fly ash, 0.5 part of titanium gypsum, 0.5 part of steel slag powder, 0.5 part of phase-change microcapsule, 0.05 part of dispersing agent and 7 parts of water.
In the embodiment, the particle size range of the graphite tailings is 0-9.5mm, wherein the particle proportion of particles smaller than 0.3mm is 15wt%; the grain size range of the saw mud material is less than 3mm, caSO in the titanium gypsum 4 ·2H 2 The content of O is 75wt%, the fineness of the steel slag powder is 350 meshes, the content of CaO in the steel slag powder is 40wt%, the content of MgO is 3wt%, and C 3 S content is 25wt%, C 2 The content of S is 35wt%, and the balance is active silicon-aluminum minerals; the shell of the phase-change microcapsule is SiO 2 Aerogel, core material is polyethylene glycol, particle diameter range of phase change microcapsule is 15 μm; the dispersant comprises sulfonated oil, sodium tripolyphosphate, sodium pyrophosphate=75%: 10%:15% (mass ratio).
In this embodiment, the preparation method of the phase-change microcapsule is as follows:
0.5 part of polysorbate-80 and 0.8 part of span-80 surfactant are uniformly mixed to form a solution A, and 10 parts of polyethylene glycol is dissolved in 100 parts of toluene solution to form a solution B. Then adding the solution A into the solution B, and stirring at a rotating speed of 700r/min for 30 minutes under the water bath condition of 50 ℃ to form stable emulsion; then adding 0.1 part of acetic acid and 13 parts of ethyl orthosilicate into the stable emulsion, and heating to 55 ℃ for polymerization reaction for 3 hours to obtain the product. And finally, washing for 2 times by using absolute ethyl alcohol, then washing by using deionized water, and carrying out suction filtration to obtain the phase-change microcapsule.
The preparation method of the graphite tailing-saw mud road subbase layer material comprises the following specific steps:
s1, adding 0.5g of dispersing agent into 70mL of stirring water, and stirring for 2min to prepare a dispersion liquid A;
s2, adding 5g of phase-change microcapsules into the dispersion liquid A, dispersing for 5min by using an ultrasonic disperser, and stirring for 2min to obtain a solution B;
s3, uniformly stirring 450g of saw mud, 550g of graphite tailings, 50g of slaked lime, 100g of fly ash, 5g of titanium gypsum and 5g of steel slag powder, adding the solution B, and continuously stirring for 1.5min to obtain the solidified graphite tailings-saw mud roadbed material.
Example 2
The graphite tailing-saw mud road subbase layer material consists of the following components in parts by mass: 60 parts of saw mud, 40 parts of graphite tailings, 10 parts of slaked lime, 20 parts of fly ash, 1.5 parts of titanium gypsum, 2 parts of steel slag powder, 2 parts of phase-change microcapsules, 0.2 part of dispersing agent and 15 parts of water.
In the embodiment, the particle size range of the graphite tailings is 0-9.5mm, wherein the particle proportion of particles smaller than 0.15mm is 15wt%; the grain size range of the saw mud material is less than 3mm, caSO in the titanium gypsum 4 ·2H 2 The content of O is 80wt%, the fineness of the steel slag powder is 400 meshes, the content of CaO in the steel slag powder is 30wt%, the content of MgO is 5wt%, and C 3 S content is 20wt%, C 2 The content of S is 40wt%, and the balance is active silicon-aluminum minerals; the shell of the phase-change microcapsule is SiO 2 Aerogel, core material is polyethylene glycol, particle diameter range of phase change microcapsule is 25 μm; the dispersant comprises sulfonated oil, sodium tripolyphosphate, sodium pyrophosphate=85%: 5%:10% (mass ratio).
In this embodiment, the preparation method of the phase-change microcapsule is as follows:
0.8 part of polysorbate-80 and 0.6 part of span-80 surfactant are uniformly mixed to form a solution A, and 15 parts of polyethylene glycol is dissolved in 100 parts of toluene solution to form a solution B. Then adding the solution A into the solution B, and stirring at a rotating speed of 400r/min for 30 minutes under the water bath condition of 50 ℃ to form stable emulsion; then adding 0.3 part of acetic acid and 10 parts of ethyl orthosilicate into the stable emulsion, and heating to 55 ℃ for polymerization reaction for 3 hours to obtain the product. And finally, washing for 3 times by using absolute ethyl alcohol, then washing by using deionized water, and carrying out suction filtration to obtain the phase-change microcapsule.
The preparation method of the graphite tailing-saw mud road subbase layer material comprises the following specific steps:
s1, adding 2g of dispersing agent into 150mL of stirring water, and stirring for 5min to prepare a dispersion liquid A;
s2, adding 20g of phase-change microcapsules into the dispersion liquid A, dispersing for 10min by using an ultrasonic disperser, and stirring for 5min to obtain a solution B;
s3, adding the solution B after uniformly stirring 600g of saw mud, 400g of graphite tailings, 100g of slaked lime, 200g of fly ash, 15g of titanium gypsum and 20g of steel slag powder, and continuously stirring for 3min to obtain the solidified graphite tailings-saw mud roadbed material.
Example 3
The graphite tailing-saw mud road subbase layer material consists of the following components in parts by mass: 50 parts of saw mud, 50 parts of graphite tailings, 7 parts of slaked lime, 15 parts of fly ash, 1 part of titanium gypsum, 1 part of steel slag powder, 1 part of phase-change microcapsule, 0.1 part of dispersing agent and 10 parts of water.
In the embodiment, the particle size range of the graphite tailings is 0-9.5mm, wherein the particle proportion of particles smaller than 0.15mm is 28wt%; the grain size range of the saw mud material is less than 3mm, caSO in the titanium gypsum 4 ·2H 2 The content of O is 70wt%, the fineness of the steel slag powder is 300 meshes, the content of CaO in the steel slag powder is 32wt%, the content of MgO is 4wt%, and C 3 S content is 21wt%, C 2 The content of S is 40wt%, and the balance is active silicon-aluminum minerals; the shell of the phase-change microcapsule is SiO 2 The aerogel and the core material are polyethylene glycol, the particle size range of the phase-change microcapsule is 20 mu m, and the sulfonated oil in the dispersing agent is sodium tripolyphosphate, sodium pyrophosphate=80%: 8%:12% (mass ratio).
In this embodiment, the preparation method of the phase-change microcapsule is as follows:
0.7 part of polysorbate-80 and 0.7 part of span-80 surfactant are uniformly mixed to form a solution A, and 13 parts of polyethylene glycol is dissolved in 100 parts of toluene solution to form a solution B. Then adding the solution A into the solution B, and stirring at a rotating speed of 580r/min for 30 minutes under the water bath condition of 50 ℃ to form stable emulsion; then adding 0.2 part of acetic acid and 11.5 parts of ethyl orthosilicate into the stable emulsion, and heating to 55 ℃ for polymerization reaction for 3 hours to obtain the product. And finally, washing for 3 times by using absolute ethyl alcohol, then washing by using deionized water, and carrying out suction filtration to obtain the phase-change microcapsule.
The preparation method of the graphite tailing-saw mud road subbase layer material comprises the following specific steps:
s1, adding 1g of dispersing agent into 100mL of stirring water, and stirring for 7.5min to prepare a dispersion liquid A;
s2, adding 10g of phase-change microcapsules into the dispersion liquid A, dispersing for 8min by using an ultrasonic disperser, and stirring for 3.5min to obtain a solution B;
s3, uniformly stirring 500g of saw mud, 500g of graphite tailings, 70g of slaked lime, 150g of fly ash, 10g of titanium gypsum and 10g of steel slag powder, adding the solution B, and continuously stirring for 2.5min to obtain the solidified graphite tailings-saw mud roadbed material.
Comparative example 1
In the comparative example, for comparison with the traditional two-ash stable fine material, a test piece is prepared by lime fly ash according to the test procedure of inorganic binder stable materials for highway engineering (JTG E51-2009) and seven-day unconfined compressive strength and freeze thawing index of solidified soil are respectively measured.
50 parts of saw mud, 50 parts of graphite tailings, 10 parts of slaked lime and 20 parts of fly ash.
The preparation method of the graphite tailing-saw mud road subbase layer material is the same as that of the example 3.
Comparative example 2
In the comparative example, in order to clearly determine the effect of the doping amount of saw mud and graphite tailings on the close packing of multi-scale solid particles, the graphite tailing-saw mud road subbase material consists of the following components in parts by mass: 20 parts of saw mud, 80 parts of graphite tailings, 7 parts of slaked lime, 15 parts of fly ash, 1 part of steel slag powder, 1 part of phase-change microcapsule, 0.1 part of dispersing agent and 10 parts of water.
The preparation method of the graphite tailing-saw mud road subbase layer material and the preparation method of the phase-change microcapsule are the same as in example 3.
Comparative example 3
In the comparative example, for defining the effect of titanium gypsum, the graphite tailing-saw mud road subbase material consists of the following components in parts by mass: 50 parts of saw mud, 50 parts of graphite tailings, 7 parts of slaked lime, 15 parts of fly ash, 1 part of steel slag powder, 1 part of phase-change microcapsule, 0.1 part of dispersing agent and 10 parts of water.
The preparation method of the graphite tailing-saw mud road subbase layer material and the preparation method of the phase-change microcapsule are the same as in example 3.
Comparative example 4
In the comparative example, for defining the effect of steel slag powder, the graphite tailing-saw mud road subbase layer material consists of the following components in parts by mass: 50 parts of saw mud, 50 parts of graphite tailings, 7 parts of slaked lime, 15 parts of fly ash, 1 part of titanium gypsum, 1 part of phase-change microcapsule, 0.1 part of dispersing agent and 10 parts of water.
The preparation method of the graphite tailing-saw mud road subbase layer material and the preparation method of the phase-change microcapsule are the same as in example 3.
Comparative example 5
In the comparative example, for defining the effect of phase change microcapsules, the graphite tailing-saw mud road subbase layer material consists of the following components in parts by mass: 50 parts of saw mud, 50 parts of graphite tailings, 7 parts of slaked lime, 15 parts of fly ash, 1 part of titanium gypsum, 1 part of steel slag powder and 10 parts of water.
The preparation method of the graphite tailing-saw mud road subbase layer material is the same as that of the example 3.
Comparative example 6
In the comparative example, the graphite tailing-saw mud road subbase layer material is prepared from the following components in parts by mass: 50 parts of saw mud, 50 parts of graphite tailings, 7 parts of slaked lime, 15 parts of fly ash, 1 part of titanium gypsum, 1 part of steel slag powder, 1 part of phase-change microcapsule and 10 parts of water.
The preparation method of the graphite tailing-saw mud road subbase layer material and the preparation method of the phase-change microcapsule are the same as in example 3.
Comparative example 7
In the comparative example, the proportion of each material is the same as that of example 3 in order to clarify the effect of the preparation method of the graphite tailing-saw mud road subbase material. In contrast to example 3, the preparation method was carried out by directly mixing various raw materials and preparing test pieces.
Comparative examples 8 to 10
The graphite tailing-saw mud road subbase layer material is prepared from the following components in parts by mass: 50 parts of saw mud, 50 parts of graphite tailings, 7 parts of slaked lime, 15 parts of fly ash, 1 part of titanium gypsum, 1 part of steel slag powder, 1 part of phase-change microcapsule, 0.1 part of dispersing agent and 10 parts of water.
In contrast to example 3, the dispersant composition was sulfonated oil, sodium tripolyphosphate=80%: 20% (mass ratio), respectively, comparative example 8; sulfonated oil sodium pyrophosphate=80%:20% (mass ratio), comparative example 9; sodium tripolyphosphate sodium pyrophosphate=40%: 60% (mass ratio), comparative example 10.
The preparation method of the graphite tailing-saw mud road subbase layer material and the preparation method of the phase-change microcapsule are the same as in example 3.
Table 1 examples and comparative examples are formulated in parts by weight
Sequence number Saw mud Graphite tailings Stone eliminating device Fly ash Titanium gypsum Slag powder Phase-change microgel Dispersing agent Water and its preparation method
Example 1 45 55 5 10 0.5 0.5 0.5 0.05 7
Example 2 60 40 10 20 1.5 2 2 0.2 15
Example 3 50 50 7 15 1 1 1 0.1 10
Comparative example 1 50 50 10 20 — — — — 10
Comparative example 2 20 80 7 15 1 1 1 0.1 10
Comparative example 3 50 50 7 15 — 1 1 0.1 10
Comparative example 4 50 50 7 15 1 — 1 0.1 10
Comparative example 5 50 50 7 15 1 1 — 0.1 10
Comparative example 6 50 50 7 15 1 1 1 — 10
Comparative example 7 50 50 7 15 1 1 1 0.1 10
Comparative example 8 50 50 7 15 1 1 1 0.1 10
Comparative example 9 50 50 7 15 1 1 1 0.1 10
Comparative example 10 50 50 7 15 1 1 1 0.1 10
Table 2 experimental results
As can be seen from the data in table 2,
the 7D unconfined compressive strength of examples 1-3 is greater than 1.1MPa, and meets the strength requirement that the strength of the two-ash stable fine grain material used as a base layer in JTG D50-2017 of the highway asphalt pavement design specification is not less than 1.1MPa, and the strength index requirement cannot be met when only the two-ash solidified iron tailings (comparative example 1) are used.
Compared with example 3, the strength of comparative example 2 cannot meet the strength standard, and the BDR value of the comparative example is obviously smaller, which indicates that the freezing resistance is poor. Comparative example 2 illustrates the effect of reasonably close packing of solid waste particles on sample performance. Meanwhile, the copper content in comparative example 2 is measured to be higher because (1) heavy metal ions are mainly present in the graphite tailings, and the increase of the proportion of the graphite tailings increases the heavy metal ion content; (2) As the proportion of graphite tailings is increased, the pores of the test piece are increased in the forming process, and the closest packing state cannot be achieved, the contact area of lime and fly ash is affected, the production amount of C-S-H gel is reduced, and the adsorption capacity of heavy metal ions is reduced.
The 30d dry shrinkage strain values of the comparative example 3 and the comparative example 4 are obviously increased compared with those of the comparative example, which shows that the titanium gypsum and the steel slag powder have certain micro-expansion characteristics and compensate the drying shrinkage of the roadbed material. And the leaching amount of heavy metal ions in comparative example 3 is larger than that of other samples, thus indicating Fe (OH) in titanium gypsum 3 、Al(OH) 3 The colloid has adsorption effect on heavy metal ions in the tailing particles. Titanium gypsum and steel slag powder can also participate in hydration reaction, so that the quantity of hydration products is increased, and the strength of roadbed materials is improved.
The freezing resistance of comparative example 5 is obviously reduced compared with that of the examples, which shows that the phase-change microcapsule has freezing resistance to roadbed materialsCan have significant positive effects. The phase change microcapsule changes phase in the temperature change process, so that the sensitivity of the roadbed material to temperature is poor, and the frost resistance of the roadbed material is improved. Simultaneous nano SiO 2 The shell can promote the pozzolanic reaction of the cementing material to a certain extent, and the strength of the sample is improved.
In combination with the data in table 2 and fig. 1 and 2, it can be seen that the base material prepared in comparative example 6 has obvious cracking after freeze thawing experiments, and the freezing resistance is reduced, which indicates that the dispersing agent can make the phase-change microcapsule better dispersed uniformly in the roadbed material, and improve the freezing resistance of the roadbed material.
Comparative example 7 illustrates that the preparation method has a positive effect on the dispersion of the phase-change microcapsule material, and the phase-change microcapsule can be uniformly dispersed by the synergistic effect of ultrasonic dispersion and the dispersing agent.
Comparative examples 8 to 10 were inferior to example 3 in terms of leaching amount of heavy metal ions and freeze thawing resistance due to the difference in the composition of the dispersant. Because sodium pyrophosphate and sodium tripolyphosphate have the effect of chelating and complexing heavy metal ions, the content of the heavy metal ions is increased, sodium pyrophosphate and sodium tripolyphosphate have about dispersion at the same time, and the phase change microcapsule cannot be effectively dispersed in time, so that the freeze-thawing resistance is reduced; the unadditized sulfonated oil may result in increased water absorption, thereby affecting the freeze resistance.

Claims (10)

1. The graphite tailing-saw mud road subbase layer material is characterized by comprising the following components in parts by weight: 40-55 parts of graphite tailings, 45-60 parts of saw mud, 0.5-2 parts of phase-change microcapsules, 5-10 parts of slaked lime, 10-20 parts of fly ash, 0.5-1.5 parts of titanium gypsum, 0.5-2 parts of steel slag powder, 5-15 parts of water and 0.05-0.2 part of dispersing agent;
the 7d unconfined compressive strength range of the graphite tailing-saw mud road subbase layer material is 2.64-3.87MPa, and the compressive strength loss rate is 82.1-86.2%.
2. The graphite tailing-saw road sub-base material according to claim 1, wherein the phase change microcapsules comprise a shell and a core material, the shell is made of silica aerogel, the core material is made of polyethylene glycol, and the particle size of the phase change microcapsules is in the range of 15-25 μm.
3. The graphite tailing-saw mud road subbase layer material according to claim 1, wherein the particle size of the graphite tailings is in the range of 0-9.5mm, wherein the particle size of less than 0.3mm is less than 30%; the grain diameter of the saw mud material is less than or equal to 0.3mm.
4. The graphite tailing-saw mud road subbase material as set forth in claim 1, wherein said slaked lime grade is national standard grade ii ash and above; the grade of the fly ash is national standard grade II ash and above.
5. The graphite tailing-saw road underlayment material of claim 1, wherein CaSO in the titanium gypsum 4 ·2H 2 The O content is more than or equal to 70 weight percent.
6. The graphite tailing-sawing sludge path subbase layer material according to claim 1, wherein the fineness of the steel slag powder is more than or equal to 300 meshes; the steel slag powder contains CaO, mgO and C 3 S and C 2 S and active silicon-aluminum minerals, caO content is 30-40%, mgO content is 3-5%, C 3 S content is 20-25%, C 2 The content of S is 35-45%, and the rest is active silicon-aluminum mineral.
7. The graphite tailing-sawing sludge road subbase layer material according to claim 1, wherein the dispersing agent is composed of sulfonated oil, sodium tripolyphosphate and sodium pyrophosphate, and the composition mass ratio is 75-85%, 5-10% and 10-15%.
8. A method of preparing the graphite tailing-saw mud road underlayment material of any one of claims 1 to 7, comprising the steps of:
s1, adding a dispersing agent into mixing water, and stirring for 2-5min to prepare a dispersion liquid A;
s2, adding phase-change microcapsules into the dispersion liquid A, dispersing for 5-10min by using an ultrasonic disperser, and stirring for 2-5min to obtain a solution B;
s3, uniformly stirring saw mud, graphite tailings, slaked lime, fly ash, titanium gypsum and steel slag powder, adding the solution B, and continuously stirring for 1.5-3min to obtain the cured graphite tailings-saw mud roadbed material.
9. The method according to claim 8, wherein in the step S2, the phase-change microcapsule is prepared by the following steps:
uniformly mixing 0.5-0.8 part of polysorbate-80 and 0.6-0.8 part of span-80 surfactant to form a solution A, and dissolving 10-15 parts of polyethylene glycol in 100 parts of toluene solution to form a solution B. Then adding the solution A into the solution B, and stirring for 30 minutes at the rotating speed of 400-700r/min under the water bath condition of 50 ℃ to form stable emulsion; then adding 0.1-0.3 part of acetic acid and 10-13 parts of ethyl orthosilicate into the stable emulsion, and heating to 55 ℃ for polymerization reaction for 3 hours to obtain the product. And finally, washing with absolute ethyl alcohol for 2-3 times, then washing with deionized water, and carrying out suction filtration to obtain the phase-change microcapsule.
10. Use of a graphite tailing-saw dust road underlayment material according to claims 1-7 or a graphite tailing-saw dust road underlayment material prepared by a method according to claims 8-9, in particular for underunderlayments of secondary and below roads.
CN202311183722.0A 2023-09-13 2023-09-13 Graphite tailing-saw mud road subbase layer material and preparation method and application thereof Pending CN117263638A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN118344104A (en) * 2024-06-06 2024-07-16 济南大学 Salt-freezing-resistant graphite tailing pavement brick and preparation and maintenance method thereof

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN118344104A (en) * 2024-06-06 2024-07-16 济南大学 Salt-freezing-resistant graphite tailing pavement brick and preparation and maintenance method thereof

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