CN114671662A - Oil shale semicoke-based soil body reinforcing material, preparation method and application thereof - Google Patents

Oil shale semicoke-based soil body reinforcing material, preparation method and application thereof Download PDF

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CN114671662A
CN114671662A CN202210391913.5A CN202210391913A CN114671662A CN 114671662 A CN114671662 A CN 114671662A CN 202210391913 A CN202210391913 A CN 202210391913A CN 114671662 A CN114671662 A CN 114671662A
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oil shale
shale semicoke
semicoke
calcined
soil body
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CN114671662B (en
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魏永锋
窦晖
张小淼
王玉忠
高江涛
曹贵
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Gansu Road and Bridge Construction Group Co Ltd
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Gansu Road and Bridge Construction Group 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
    • C04B28/02—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 hydraulic cements other than calcium sulfates
    • C04B28/10—Lime cements or magnesium oxide cements
    • C04B28/12—Hydraulic lime
    • 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
    • C04B7/24—Cements from oil shales, residues or waste other than slag
    • 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
    • E01C7/00—Coherent pavings made in situ
    • 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
    • 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
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P40/00—Technologies relating to the processing of minerals
    • Y02P40/10—Production of cement, e.g. improving or optimising the production methods; Cement grinding
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
    • Y02W30/00—Technologies for solid waste management
    • Y02W30/50—Reuse, recycling or recovery technologies
    • Y02W30/91—Use of waste materials as fillers for mortars or concrete

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Ceramic Engineering (AREA)
  • Structural Engineering (AREA)
  • Materials Engineering (AREA)
  • Organic Chemistry (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Inorganic Chemistry (AREA)
  • Architecture (AREA)
  • Civil Engineering (AREA)
  • Soil Conditioners And Soil-Stabilizing Materials (AREA)

Abstract

The invention provides an oil shale semicoke-based soil body reinforcing material, a preparation method and application thereof, wherein the oil shale semicoke-based soil body reinforcing material consists of calcined oil shale semicoke fine materials, cement and quicklime; the preparation method of the calcined oil shale semicoke fine material comprises the following steps: calcining the oil shale semicoke in the air at the temperature of 400-700 ℃ to prepare calcined oil shale semicoke, and grinding the calcined oil shale semicoke to prepare a calcined oil shale semicoke fine material. The oil shale semicoke-based soil body reinforcing material disclosed by the invention realizes the efficient reutilization of oil shale semicoke, reduces the using amount of cement and quicklime and realizes the benefits of energy conservation and environmental protection. The preparation method combines calcination and grinding to ensure that Al in the oil shale semicoke2O3And SiO2Conversion to active Al2O3And active SiO2The mineral activity of the oil shale semicoke is improved by combining the excitation effect of cement and quicklime, and the reinforcement performance of the oil shale semicoke-based soil body reinforcement material is further improved.

Description

Oil shale semicoke-based soil body reinforcing material, preparation method and application thereof
Technical Field
The invention belongs to the technical field of road materials, relates to oil shale semicoke, and particularly relates to an oil shale semicoke-based soil body reinforcing material, a preparation method and application thereof.
Background
China is one of the most abundant countries of oil shale resources, and the main utilization modes of oil shale are combustion power generation and dry distillation extraction of oil shale oil. The oil shale is used for generating power by burning to generate oil shale power plant ash and power plant slag, the oil shale is used for extracting oil shale oil by dry distillation to generate oil shale semicoke, and the oil shale power plant ash, the oil shale power plant slag and the oil shale semicoke are collectively called as oil shale waste slag. Because the oil content of the oil shale is relatively low and is mostly below 20%, a large amount of oil shale semicoke can be generated after the oil shale is extracted by dry distillation, and according to statistics, the emission of the oil shale semicoke reaches millions of tons every year in China. However, at present, application research on the oil shale semicoke is less, and there are reports in documents that the oil shale semicoke and the fly ash are mixed to be used as a highway building material, but the highway building material has poor mechanical properties and is difficult to popularize in practical application.
The cement is the most commonly used soil body reinforcing material in the construction of road structure layers, and although the cement has good reinforcing performance, the cement has the defects of high energy consumption, high carbon emission and high pollution. According to the current situation, in the prior art, although the common soil body reinforcing material cement has good reinforcing performance, the common soil body reinforcing material cement is not energy-saving and environment-friendly, and the oil shale semicoke is adopted as the soil body reinforcing material, the secondary utilization rate of the oil shale semicoke can be improved, the energy saving and environment protection are realized, but the reinforcing performance of the oil shale semicoke is poorer.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide an oil shale semicoke-based soil body reinforcing material, a preparation method and application thereof, and solves the technical problem that the soil body reinforcing material in the prior art is difficult to give consideration to good reinforcing performance and energy-saving and environment-friendly properties.
In order to solve the technical problems, the invention adopts the following technical scheme:
an oil shale semicoke-based soil body reinforcing material is composed of the following raw materials: calcining the oil shale semi-coke fine material, cement and quicklime;
the preparation method of the calcined oil shale semicoke fine material comprises the following steps: calcining the oil shale semicoke in air to obtain calcined oil shale semicoke at the calcining temperature of 400-700 ℃, and grinding the calcined oil shale semicoke to obtain a calcined oil shale semicoke fine material.
The invention also has the following technical characteristics:
specifically, the calcined oil shale semicoke fine material contains active Al2O3And active SiO2(ii) a The active Al2O3And active SiO2The sum of the contents of the calcined oil shale semi-coke fine material is more than or equal to 5 percent;
the particle size distribution of the calcined oil shale semi-coke fine material is that D50 is less than or equal to 30 mu m, and D90 is less than or equal to 100 mu m.
Preferably, the active Al2O3And active SiO2The sum of the contents of the calcined oil shale semi-coke fine material is 6 to 6.9 percent.
Specifically, the preparation method of the calcined oil shale semicoke fine material comprises the following steps: calcining the oil shale semi-coke in air to obtain calcined oil shale semi-coke, wherein the calcining temperature is 400-700 ℃, the calcining time is 10-30 min, and the heating rate is 15-25 ℃/min; and grinding the prepared calcined oil shale semicoke for 20-40 min to obtain a calcined oil shale semicoke fine material.
Specifically, the oil shale semicoke contains Al2O3And SiO2(ii) a The Al is2O3The content of the SiO in the oil shale semicoke is more than 18 percent2The content of the oil shale semicoke is more than 30 percent.
Preferably, the oil shale semicoke also contains Fe2O3、Na2O、K2O, MgO andCaO, said Fe2O3The content of Na in the oil shale semicoke is more than 5 percent2The content of O in the oil shale semicoke is more than 0.2 percent, and the content of K in the oil shale semicoke is more than 0.2 percent2The content of O in the oil shale semicoke is more than 1.0%, the content of MgO in the oil shale semicoke is more than 0.5%, and the content of CaO in the oil shale semicoke is more than 0.5%.
Specifically, the oil shale semicoke-based soil body reinforcing material comprises the following raw materials in percentage by mass: 75-90% of calcined oil shale semi-coke fine material, 3-8% of cement, 6-20% of quicklime, and the sum of the mass percentages of the raw materials is 100%.
Preferably, the oil shale semicoke-based soil body reinforcing material consists of the following raw materials in percentage by mass: the calcined oil shale semicoke fine material accounts for 83.3-85.1 percent, the cement accounts for 4.2-6.4 percent, the quicklime accounts for 8.5-12.5 percent, and the sum of the mass percentages of the raw materials is 100 percent.
The invention also discloses a preparation method of the oil shale semicoke-based soil body reinforcing material, which is characterized in that the prepared calcined oil shale semicoke fine material, cement and quicklime are mixed and uniformly stirred to prepare the oil shale semicoke-based soil body reinforcing material.
The invention also protects the application of the oil shale semicoke-based soil reinforcing material as a soil reinforcing material in a road structure layer.
The specific process of the application is as follows: uniformly mixing the oil shale semicoke-based soil body reinforcing material, the solidified soil body and water to prepare a reinforced soil body material, wherein the mass of the oil shale semicoke-based soil body reinforcing material is 5-10% of that of the solidified soil body; uniformly paving the prepared reinforced soil body material, and compacting, wherein the compaction degree is 96%; and (5) curing for seven days after compaction to complete the construction of the road structure layer.
Compared with the prior art, the invention has the following technical effects:
the invention relates to an oil shale semicoke-based soil body reinforcing material, wherein the main component of the oil shale semicoke fine material is calcined by taking oil shale semicoke as a raw material,the efficient reutilization of the oil shale semicoke is realized, and the energy-saving and environment-friendly performance is good. The calcined oil shale semicoke fine material contains high-content active Al2O3And active SiO2The method is combined with the excitation effect of cement and quicklime, is favorable for forming volcanic reaction and hydration reaction, and further improves the reinforcement performance of the oil shale semicoke-based soil body reinforcement material. In sum, the oil shale semicoke-based soil body reinforcing material provided by the invention has good reinforcing performance and energy-saving and environment-friendly properties.
The oil shale semicoke-based soil body reinforcing material is a multi-mineral cementing material, and has stable performance, high compressive strength and durability.
(III) the oil shale semicoke-based soil body reinforcing material has the advantages of wide raw material distribution range, easy acquisition and low manufacturing cost.
(IV) when the fine calcined oil shale semicoke material is prepared, a combined calcining and grinding process is adopted, so that Al in the oil shale semicoke2O3And SiO2Conversion to active Al2O3And active SiO2Improves the active Al in the semicoke fine material of the calcined oil shale2O3And active SiO2The content of the oil shale semi-coke base soil body reinforcing material is further improved.
And (V) when the calcined oil shale semicoke fine material is prepared, the adopted calcination temperature is lower, and the energy conservation and emission reduction are further realized.
(VI) the oil shale semicoke-based soil body reinforcing material provided by the invention is used for replacing or partially replacing the existing cement product in road structure layer construction, can reduce the cement consumption in road construction, realizes low cost, energy conservation and environmental protection, and has a wide popularization prospect in the aspect of green road traffic construction.
Detailed Description
In the invention:
d50 being less than or equal to 30 μm means that in the calcined oil shale char fines, the mass of the calcined oil shale char fines particles less than 30 μm comprises 50% of the total mass of the calcined oil shale char fines.
D90 being less than or equal to 100 μm means that in the calcined oil shale char fines, the mass of the calcined oil shale char fines particles less than 100 μm makes up 90% of the total mass of the calcined oil shale char fines.
The contents mean the mass contents.
The loss on ignition of the calcined oil shale semi-coke fine material is measured by adopting the following method: and (3) calcining the prepared calcined oil shale semicoke fine material in a resistance furnace at 950-1000 ℃, weighing and calculating the mass loss amount of the calcined oil shale semicoke fine material, and dividing the mass loss amount of the calcined oil shale semicoke fine material by the mass of the calcined oil shale semicoke fine material before calcination to obtain the ignition loss amount of the calcined oil shale semicoke fine material.
Active Al2O3And active SiO2Refers to an amorphous phase of the active mineral component formed by dehydroxylation of the kaolin mineral component within the oil shale mineral.
Specifically, calcining active Al in oil shale semicoke fines2O3The content determination method comprises the following steps:
step one, determining a titration coefficient K;
adding 10mL of EDTA standard solution (the molar concentration of the EDTA standard solution is 0.035mol/L) into a 300mL conical flask, dropwise adding about 20mL of acetic acid-ammonium acetate buffer solution (the pH value of the acetic acid-ammonium acetate buffer solution is 4.5) into the 300mL conical flask, adjusting the pH value to 5-6, adding 5-6 drops of xylenol orange indicator, uniformly mixing, dropwise adding zinc sulfate standard solution (the molar concentration of the zinc sulfate standard solution is 0.035mol/L) into the solution, titrating until the solution changes from yellow to bright yellow and then changes to red, and stopping titration when the titration end point is reached. The volume of EDTA standard solution added to the Erlenmeyer flask is recorded as V(EDTA)The volume of the standard solution of zinc sulfate consumed during the titration was recorded as V(ZnSO4)Then EDTA to ZnSO4Has a titration coefficient K equal to V(ZnSO4)Divided by V(EDTA)。
Step two, measuring active Al in the calcined oil shale semi-coke fine material2O3Content (wt.)；
100mL of hydrochloric acid (HCl at a molar concentration of about 6mol/L) was poured into a 250mL conical flask and heated to 80 ℃ using a constant temperature magnetic stirrer. Accurately weighing (2.500 +/-0.020) g of calcined oil shale semi-coke fine material, pouring the calcined oil shale semi-coke fine material into a 250mL conical flask, uniformly stirring, filtering, pouring the filtrate into a 250mL volumetric flask, and accurately diluting the filtrate to 250 mL.
Transferring 10mL of filtrate into a 300mL wide-mouth bottle by using a pipette, dropwise adding about 20mL of acetic acid-ammonium acetate buffer solution, adjusting the pH to 5-6, then adding 25.00mL of EDTA standard solution into the wide-mouth bottle, and then diluting the liquid in the wide-mouth bottle to 100 mL.
Covering the bottleneck of the wide-mouth bottle by using a watch glass, adding 5-6 drops of xylenol orange serving as an indicator, heating and boiling for 3min, dropwise adding a zinc sulfate standard solution into the solution for titration after the solution is changed from colorless to yellow until the solution is changed from yellow to bright yellow and then is mutated into red, and stopping titration when the titration end point is reached.
Calculating according to the following formula to obtain active Al in the calcined oil shale semicoke fine material2O3The content of (A):
Figure BDA0003595961550000061
in formula I:
ω(Al2O3) Representing active Al in the calcined oil shale semicoke fines2O3The content of (A);
c represents the molar concentration of a zinc sulfate standard solution or an EDTA standard solution, and the C is 0.035 and the unit is mol/L;
k represents EDTA vs ZnSO4The titration coefficient of (a);
V1(EDTA)representing the volume of the EDTA standard solution added into the wide-mouth bottle, and the unit is mL;
V1(ZnSO4)the volume of zinc sulfate standard solution consumed at the time of dropping is expressed in mL;
MRAl2O3represents Al2O3Relative molecule ofMass, MRAl2O3Is 102, in g/mol;
m1 represents the mass of the weighed calcined oil shale semicoke fines in g.
Specifically, calcining active SiO in the oil shale semicoke fines2The content determination method comprises the following steps:
accurately weighing (2.500 +/-0.020) g of calcined oil shale semi-coke fine material, pouring the calcined oil shale semi-coke fine material into a 100mL polytetrafluoroethylene beaker, adding 50mL of mixed acid into the polytetrafluoroethylene beaker (the preparation process of the mixed acid comprises the steps of slowly adding 60mL of 98% concentrated sulfuric acid into 520mL of water under continuous stirring, adding 220mL of 85% phosphoric acid after cooling), heating for 1h in a boiling water bath, transferring the mixture in the polytetrafluoroethylene beaker into a 250mL volumetric flask after cooling, diluting until the scales of the volumetric flask are uniformly shaken, and filtering the mixture in the volumetric flask by using slow-speed filter paper to obtain a filtrate.
Sucking 50mL of filtrate into a 250mL plastic beaker, adding 10mL of nitric acid with the mass concentration of 68% into the plastic beaker, placing the plastic beaker into a cold water bath, adding about 3g of solid potassium chloride, carefully stirring until the potassium chloride reaches a supersaturated state, then slowly adding 10mL of potassium fluoride solution (the mass concentration of the potassium fluoride solution is 200g/L) while stirring, continuing to stir for 1min, and then standing for about 20 min.
A filter paper is padded in a polyethylene funnel or a wax-coated funnel, a potassium chloride-ethanol washing solution is used (the washing solution is prepared by dissolving 50g of potassium chloride in 1L of 20% ethanol aqueous solution, adding a plurality of drops of methyl red indicator solution, and adjusting the color to yellow by using 0.100mol/L of sodium hydroxide standard solution), and the beaker and the filter paper are washed for 2-3 times respectively.
Transferring the solid precipitate in the plastic beaker together with the treated filter paper into an original polytetrafluoroethylene beaker, adding 10mL of potassium chloride-ethanol washing liquor and 10 drops of a mixed indicator into the polytetrafluoroethylene beaker (the mixed indicator is prepared by dissolving 0.09g of bromothymol blue and 0.11g of phenol red in 40mL of 50% ethanol aqueous solution), adding a sodium hydroxide standard solution into the polytetrafluoroethylene beaker for neutralization, stirring while adding, repeatedly scrubbing the wall of the beaker until the wall of the beaker presents bright purple, and stopping the neutralization process without recording the volume of the sodium hydroxide standard solution.
Adding 150mL of neutral boiling water into a polytetrafluoroethylene beaker, uniformly stirring, immediately titrating by using a sodium hydroxide standard solution until the solution in the beaker presents stable and bright purple, and stopping titration when reaching a titration end point.
The active SiO in the calcined oil shale semi-coke fine material is obtained by calculation according to the following formula2The content of (A):
Figure BDA0003595961550000081
in formula II:
Figure BDA0003595961550000082
indicating the active SiO in the calcined oil shale semicoke fines2The content of (a);
m2 represents the mass of the weighed calcined oil shale semicoke fines in g;
V(NaOH)represents the volume of sodium hydroxide standard solution consumed at the time of titration in mL;
C(NaOH)the mass concentration of the sodium hydroxide standard solution is expressed in g/mL.
It should be noted that the raw materials used in the present invention are conventional raw materials known in the art, for example, ordinary portland cement having a strength grade of 32.5MPa is used as the cement; the quicklime is calcareous quicklime meeting the second-grade and above standards of the quicklime, the content of active oxides in the quicklime is 91 percent, and the fineness is less than or equal to 40 meshes; the fly ash is conventional fly ash meeting first-grade standards.
The following embodiments of the present invention are provided, and it should be noted that the present invention is not limited to the following embodiments, and all equivalent changes based on the technical solutions of the present invention are within the protection scope of the present invention.
Example 1:
the embodiment provides a preparation method of an oil shale semicoke-based soil body reinforcing material, which comprises the following specific processes: weighing 20 parts of calcined oil shale semicoke fine material, 1.5 parts of cement and 2 parts of quicklime, mixing and uniformly stirring the calcined oil shale semicoke fine material, the cement and the quicklime by adopting a planetary stirrer, and preparing 23.5 parts of oil shale semicoke-based soil body reinforcing material.
As a specific scheme of this embodiment, the preparation process of the calcined oil shale semicoke fine material specifically comprises: weighing 50 parts of oil shale semi-coke, putting the oil shale semi-coke into an electric heating rotary furnace, heating to 650 ℃ at the heating rate of 20 ℃/min, calcining at 650 ℃ for 20min, stopping heating, and naturally cooling to room temperature to obtain calcined oil shale semi-coke; air is continuously introduced during the calcination and cooling. And grinding the prepared calcined oil shale semicoke for 30min by adopting a planetary ball mill to prepare a calcined oil shale semicoke fine material.
In this example, the calcined oil shale semicoke fines material contained active Al2O3And active SiO2Active Al2O3And active SiO2The sum of the contents in the calcined oil shale semicoke fine material is 6.9 percent; the particle size distribution of the calcined oil shale semi-coke fine material is that D50 is 13.847 μm, and D90 is 55.463 μm; the loss on ignition of the calcined oil shale semi-coke fine material is 2.3%.
In the embodiment, the residual organic matters in the oil shale semicoke can be eliminated by adopting calcination, the mineral structure of the oil shale semicoke is changed, and the mineral activity of the oil shale semicoke is improved, so that the method is a chemical activation process. The prepared calcined oil shale semicoke is ground into a fine calcined oil shale semicoke material, so that the specific surface area of the calcined oil shale semicoke can be increased, the mineral activity of the calcined oil shale semicoke is improved, and the physical activation process is realized. By combining chemical activation and physical activation, the mineral activity of the oil shale semicoke can be obviously improved, and the performance of the oil shale semicoke-based soil body reinforcing material can be further improved.
In this example, the oil shale semicoke used in the preparation of the fine calcined oil shale semicoke material is a mineral material, and is oilChemical compositions of residual waste residues of shale after high-temperature dry distillation oil refining have crucial influence on material performance, an X-ray fluorescence spectrometer is required to be adopted to quantitatively detect oxide compositions in oil shale semicoke before processing, and when Al is used2O3The content of the SiO in the oil shale semicoke is more than 18 percent2When the content of the oil shale semicoke is more than 30%, the oil shale semicoke can meet the preparation requirement.
In this embodiment, after the oxide component in the oil shale semicoke is quantitatively detected by using the X-ray fluorescence spectrometer, it is determined that the oil shale semicoke contains Al2O3、SiO2、Fe2O3、Na2O、K2O, MgO and CaO; wherein, Al2O3The content of the oil shale semicoke is 20.36 percent and SiO2The content of Fe in oil shale semicoke is 53.11%2O3The content of the oil shale semicoke is 7.18 percent and Na2The content of O in the oil shale semicoke is 0.27 percent, and K2The content of O in the oil shale semicoke is 1.38%, the content of MgO in the oil shale semicoke is 0.73%, and the content of CaO in the oil shale semicoke is 0.58%.
By adopting the preparation method of the oil shale semicoke-based soil body reinforcing material in the embodiment, the oil shale semicoke-based soil body reinforcing material is finally prepared and comprises the following raw materials in percentage by mass: 85.1% of calcined oil shale semi-coke fine material, 6.4% of cement and 8.5% of quicklime.
In this embodiment, the oil shale semicoke-based soil body reinforcing material should be stored in a dry container, such as a powder tank, a cement tank truck or a woven bag, before use, so as to prevent deterioration due to moisture, and the storage time of the oil shale semicoke-based soil body reinforcing material under a dry condition should not exceed 6 months.
In the embodiment, the reinforcing performance of the finally prepared oil shale semicoke-based soil reinforcing material is tested, and the test results are shown in table 1.
The concrete process for manufacturing the reinforced soil test piece before the test comprises the following steps: the optimum water consumption is determined by an indoor compaction test, which is carried out according to the test procedure of Highway soil engineering test (JTG E40-T0131). After being measured by an indoor compaction test, the optimal water consumption is determined to be 12.3%, then the oil shale semicoke-based soil body reinforcing material is doped into loess, the mass of the oil shale semicoke-based soil body reinforcing material doped into the loess is 5% and 10%, water is added for mixing to prepare a reinforced soil body material, the prepared reinforced soil body material is uniformly spread and then compacted, the compaction degree is 96%, and the soil body material is laminated in a standard curing room for moisture preservation and curing for seven days after being compacted to prepare a reinforced soil body test piece.
The prepared reinforced soil body test piece is tested, and the specific process of the test refers to the conventional standard test method known in the prior art: the California load ratio test procedure is referred to road soil test Specification (JTG E40T 0134); the testing process of the non-immersed unconfined compressive strength refers to the road soil engineering test specification (JTG E40-T0148); the procedure for testing the ratio of the immersed residual strength is referred to road soil test Specification (JTG E40-T0148).
Example 2:
the embodiment provides a preparation method of an oil shale semicoke-based soil body reinforcing material, which comprises the following specific processes: weighing 20 parts of calcined oil shale semicoke fine material, 1 part of cement and 3 parts of quicklime, mixing and uniformly stirring the calcined oil shale semicoke fine material, the cement and the quicklime by adopting a planetary stirrer to obtain 24 parts of oil shale semicoke-based soil body reinforcing material.
In this example, the calcined oil shale semicoke fines prepared in example 1 were used to calcine the oil shale semicoke fines.
By adopting the preparation method of the oil shale semicoke-based soil body reinforcing material in the embodiment, the oil shale semicoke-based soil body reinforcing material is finally prepared and comprises the following raw materials in percentage by mass: the fine material of the calcined oil shale semicoke is 83.3 percent, the cement is 4.2 percent, and the quicklime is 12.5 percent.
In the embodiment, the reinforcing performance of the finally prepared oil shale semicoke-based soil reinforcing material is tested, and the test results are shown in table 1. The specific procedure of the test was the same as in example 1.
Example 3:
the embodiment provides a preparation method of an oil shale semicoke-based soil reinforcement material, and the specific process of the method is the same as that of the embodiment 1.
In this example, the preparation process of the calcined oil shale semicoke fines was substantially the same as in example 1, except that: the calcination temperature of the oil shale semicoke is 450 ℃.
In this example, the calcined oil shale semicoke fines material contained active Al2O3And active SiO2Active Al2O3And active SiO2The sum of the contents in the calcined oil shale semicoke fine material is 6.0 percent; the particle size distribution of the calcined oil shale semi-coke fine material is that D50 is 14.027 μm, and D90 is 49.393 μm; the loss on ignition of the fine semicoke material of the calcined oil shale is 4.6 percent.
The preparation method of the oil shale semicoke-based soil body reinforcing material in the embodiment is adopted to finally prepare the oil shale semicoke-based soil body reinforcing material, and the oil shale semicoke-based soil body reinforcing material comprises the following raw materials in percentage by mass: 85.1% of calcined oil shale semi-coke fine material, 6.4% of cement and 8.5% of quicklime.
In the embodiment, the reinforcing performance of the finally prepared oil shale semicoke-based soil reinforcing material is tested, and the test results are shown in table 1. The specific procedure of the test was the same as in example 1.
Example 4:
the embodiment provides a preparation method of an oil shale semicoke-based soil reinforcement material, and the specific process of the preparation method is the same as that of the embodiment 2.
In this example, the calcined oil shale semicoke fines prepared in example 3 were used to calcine the oil shale semicoke fines.
By adopting the preparation method of the oil shale semicoke-based soil body reinforcing material in the embodiment, the oil shale semicoke-based soil body reinforcing material is finally prepared and comprises the following raw materials in percentage by mass: the fine material of the calcined oil shale semicoke is 83.3 percent, the cement is 4.2 percent, and the quicklime is 12.5 percent.
In the embodiment, the reinforcing performance of the finally prepared oil shale semicoke-based soil reinforcing material is tested, and the test results are shown in table 1. The specific procedure of the test was the same as in example 1.
Example 5:
the embodiment provides an application of the oil shale semicoke-based soil reinforcement material of embodiment 1 as a soil reinforcement material in a road structure layer, and the specific process of the application is as follows:
doping the oil shale semicoke-based soil body reinforcing material prepared in the embodiment 1 into a soil body, adding water, and mixing to prepare a reinforced soil body material, wherein the mass of the oil shale semicoke-based soil body reinforcing material doped into the soil body is 5% of the mass of the soil body; and uniformly paving the prepared reinforced soil body material, compacting, and maintaining for seven days to complete the construction of the road structure layer.
In this embodiment, before preparing the reinforced soil body material, a representative solidified soil sample needs to be selected, and the representative solidified soil sample may be loess, saline soil or soft clay. The design of the mixing ratio of the oil shale semicoke-based soil body reinforcing material and the soil sample is finished indoors, and the optimal using amount, compaction degree and other parameters of the oil shale semicoke-based soil body reinforcing material are measured.
In this example, the mixing was carried out by the "on-site road mixing method" or the "factory ready-mixing method" commonly used by those skilled in the art. When the field road mixing method is used for construction, the oil shale semicoke-based soil body reinforcing material is firstly uniformly scattered on the surface of the solidified soil body according to the optimal using amount of the solidified material, and then is uniformly mixed by adopting conventional stirring equipment under the condition of the optimal using amount of water, so that the reinforced soil body material is prepared. Then compacting the reinforced soil body material by using a road roller, wherein the compaction degree is 96%; and (5) moisturizing and maintaining for seven days after compaction to finish the construction of the road structure layer.
In the embodiment, during the construction of the 'factory premixing method', conventional continuous mixing equipment is adopted, the oil shale semicoke-based soil body reinforcing material, the solidified soil body and water are uniformly mixed according to mixing ratio design parameters to prepare a reinforced soil body material, a dump truck with tarpaulin is used for transporting the prepared reinforced soil body material to a construction site, the prepared reinforced soil body material is uniformly paved to the site, and then a road roller is adopted for compacting the paved reinforced soil body material, wherein the compaction degree is 96%; and (5) moisturizing and maintaining for seven days after compaction to finish the construction of the road structure layer.
In the embodiment, the total duration from the mixing and water adding to the compaction completion during construction cannot exceed the initial setting time of the oil shale semicoke-based soil body reinforcing material, and the total duration is usually 3 h.
Comparative example 1:
this comparative example shows a method for preparing a soil reinforcing material, which is the same as in example 1.
In this comparative example, the process for preparing calcined oil shale char fines was essentially the same as in example 1, except that: the calcination temperature of the oil shale semicoke is 1100 ℃.
In this comparative example, the calcined oil shale semicoke fines material contained active Al2O3And active SiO2Active Al2O3And active SiO2The sum of the contents in the calcined oil shale semicoke fines is 1.1%; the particle size distribution of the calcined oil shale semi-coke fine material is that D50 is 12.368 μm, and D90 is 50.236 μm; the loss on ignition of the fine semicoke material of the calcined oil shale is 0.6 percent.
By adopting the preparation method of the soil reinforcing material in the comparative example, the finally prepared soil reinforcing material comprises the following raw materials in percentage by mass: 85.1% of calcined oil shale semi-coke fine material, 6.4% of cement and 8.5% of quicklime.
In the comparative example, the reinforcing performance of the finally prepared soil reinforcing material was tested, and the test results are shown in table 2. The specific procedure of the test was the same as in example 1.
Comparative example 2:
this comparative example shows a method for preparing a soil reinforcing material, which is the same as in example 1.
In this comparative example, the procedure for the preparation of calcined oil shale semicoke fines was essentially the same as in example 1, except that: the calcination temperature of the oil shale semicoke is 200 ℃.
Book pairIn proportion, the calcined oil shale semicoke fines material contains active Al2O3And active SiO2Active Al2O3And active SiO2The sum of the contents in the calcined oil shale semicoke fine material is 0.8 percent; the particle size distribution of the calcined oil shale semi-coke fine material is that D50 is 11.368 μm, and D90 is 60.785 μm; the loss on ignition of the calcined oil shale semicoke fine material is 19.6%.
By adopting the preparation method of the soil reinforcing material in the comparative example, the finally prepared soil reinforcing material comprises the following raw materials in percentage by mass: 85.1% of calcined oil shale semi-coke fine material, 6.4% of cement and 8.5% of quicklime.
In the comparative example, the reinforcing performance of the finally prepared soil reinforcing material was tested, and the test results are shown in table 2. The specific procedure of the test was the same as in example 1.
Comparative example 3:
this comparative example shows a method for preparing a soil reinforcing material, which is the same as in example 1.
In this comparative example, the process for preparing the oil shale semicoke fines was essentially the same as in example 1, except that: directly grinding the oil shale semicoke for 30min without calcining the oil shale semicoke to prepare the oil shale semicoke fine material.
In this comparative example, the oil shale char fines comprise active Al2O3And active SiO2Active Al2O3And active SiO2The sum of the contents in the calcined oil shale semicoke fine material is 0.5 percent; the particle size distribution of the oil shale semi-coke fine material is that D50 is 12.368 mu m, and D90 is 50.236 mu m; the loss on ignition of the oil shale semicoke fine material is 22.6%, and the method for measuring the loss on ignition of the oil shale semicoke fine material is the same as the method for measuring the loss on ignition of the calcined oil shale semicoke.
By adopting the preparation method of the soil reinforcing material in the comparative example, the finally prepared soil reinforcing material comprises the following raw materials in percentage by mass: 85.1% of oil shale semicoke fine material, 6.4% of cement and 8.5% of quicklime.
In the comparative example, the reinforcing performance of the finally prepared soil reinforcing material was tested, and the test results are shown in table 2. The specific procedure of the test was the same as in example 1.
Comparative example 4:
the comparative example provides a preparation method of a soil reinforcing material, and the method comprises the following specific steps: and weighing 20 parts of calcined oil shale semicoke fine material and 2 parts of quicklime, mixing the calcined oil shale semicoke fine material and the quicklime by adopting a planetary stirrer, and uniformly stirring to obtain 22 parts of the oil shale semicoke-based soil body reinforcing material.
In this comparative example, the calcined oil shale semicoke fines prepared in example 1 were used to calcine the oil shale semicoke fines.
By adopting the preparation method of the soil reinforcing material in the comparative example, the finally prepared soil reinforcing material comprises the following raw materials in percentage by mass: the fine material of the calcined oil shale semicoke accounts for 90.9 percent, and the quicklime accounts for 9.1 percent.
In the comparative example, the reinforcing performance of the finally prepared soil reinforcing material was tested, and the test results are shown in table 2. The specific procedure of the test was the same as in example 1.
Comparative example 5:
the comparative example provides a preparation method of a soil reinforcing material, and the method comprises the following specific steps: and weighing 20 parts of calcined oil shale semicoke fine material and 1.5 parts of cement, and mixing and uniformly stirring the calcined oil shale semicoke fine material and the cement by adopting a planetary stirrer to obtain 21.5 parts of the oil shale semicoke-based soil body reinforcing material.
In this comparative example, the calcined oil shale semicoke fines prepared in example 1 were used to calcine the oil shale semicoke fines.
By adopting the preparation method of the soil reinforcing material in the comparative example, the finally prepared soil reinforcing material comprises the following raw materials in percentage by mass: the fine material of the calcined oil shale semi-coke is 93.0 percent, and the cement is 7.0 percent.
In the comparative example, the reinforcing performance of the finally prepared soil reinforcing material was tested, and the test results are shown in table 2. The specific procedure of the test was the same as in example 1.
Comparative example 6:
the comparative example provides a preparation method of a soil reinforcing material, and the preparation method comprises the following specific steps: weighing 20 parts of calcined oil shale semicoke fine material and 10 parts of fly ash, and mixing and uniformly stirring the calcined oil shale semicoke fine material and the fly ash by adopting a planetary stirrer to obtain 30 parts of oil shale semicoke-based soil reinforcing material.
In this comparative example, the calcined oil shale semicoke fines prepared in example 1 were used to calcine the oil shale semicoke fines.
By adopting the preparation method of the soil reinforcing material in the comparative example, the finally prepared soil reinforcing material comprises the following raw materials in percentage by mass: the calcined oil shale semi-coke fine material accounts for 66.7 percent, and the fly ash accounts for 33.3 percent.
In the comparative example, the reinforcing performance of the finally prepared soil reinforcing material was tested, and the test results are shown in table 2. The specific procedure of the test was the same as in example 1.
Effect verification:
table 1 results of reinforcement performance test of oil shale semicoke-based soil reinforcement materials in examples 1 to 4
Figure BDA0003595961550000171
Table 2 reinforcement performance test results of the soil reinforcement materials in comparative examples 1 to 6
Figure BDA0003595961550000172
Figure BDA0003595961550000181
In tables 1 and 2:
the doping amount of the oil shale semicoke-based soil body reinforcing material is equal to the mass of the oil shale semicoke-based soil body reinforcing material doped in the loess divided by the mass of the loess.
The doping amount of the soil body reinforcing material is equal to the mass of the soil body reinforcing material doped in the loess divided by the mass of the loess.
The ratio of the residual strength after soaking is equal to the residual strength of the test piece after the soil body material after being reinforced is soaked divided by the residual strength of the test piece before soaking.
From examples 1 to 4 and comparative examples 1 to 6, it can be seen that:
(A) from examples 1 to 4 it is clear that:
in examples 1 to 4, when the doping amount of the oil shale semicoke-based soil reinforcing material is 5%, the 7d california bearing ratios of the reinforced soil test pieces are all higher than 85%, the 7d non-immersed unconfined compressive strength is not lower than 1.5Mpa, the 28d non-immersed unconfined compressive strength is higher than 2.5Mpa, the 7d immersed residual strength ratio is higher than 80%, and the 28d immersed residual strength ratio is higher than 85%.
In examples 1 to 4, when the doping amount of the oil shale semicoke-based soil reinforcing material is 10%, the 7d california bearing ratios of the reinforced soil test pieces are all higher than 100%, the 7d non-immersed unconfined compressive strength is all greater than 2.5Mpa, the 28d non-immersed unconfined compressive strength is all greater than 4Mpa, the 7d immersed residual strength ratio is not lower than 80%, and the 28d immersed residual strength ratio is all higher than 90%.
The analysis proves that the oil shale semicoke-based soil body reinforcing material prepared by the invention is doped into the soil body, the mechanical property of the reinforced soil body test piece can be improved, and the oil shale semicoke-based soil body reinforcing material prepared by the invention has excellent reinforcing property.
(B) From example 1 and comparative examples 1 to 3, it can be seen that:
in comparative examples 1, 2 and 3, when the doping amount of the soil reinforcing material is 5%, the 7d california bearing ratios of the reinforced soil test pieces are all lower than 35%, the 7d non-immersed unconfined compressive strength is lower than 1.0Mpa, the 28d non-immersed unconfined compressive strength is lower than 1.5Mpa, the 7d immersed residual strength ratio is not higher than 40%, and the 28d immersed residual strength ratio is lower than 45%.
In comparative examples 1, 2 and 3, when the doping amount of the soil reinforcing material is 10%, the 7d california bearing ratios of the reinforced soil test pieces are all lower than 50%, the 7d non-immersed unconfined compressive strength is all lower than 1.5Mpa, the 28d non-immersed unconfined compressive strength is all lower than 1.5Mpa, the 7d immersed residual strength ratio is all lower than 45%, and the 28d immersed residual strength ratio is all lower than 45%.
Comparative examples 1 and 2 differ in calcination temperature compared to example 1, and comparative example 3 is not calcined. In comparative examples 1, 2 and 3, the reinforced soil body test piece has a low California bearing ratio, a low 7d non-immersed unconfined compressive strength value, a slow rise of the non-immersed unconfined compressive strength in the later period, a certain residual strength in the reinforced soil body test piece after immersion, and an unsatisfactory mechanical property. From the above analysis, it can be known that before the soil body reinforcing material is prepared, the oil shale semicoke is not calcined or the calcination temperature is too high or too low, which may cause the reinforcing performance of the soil body reinforcing material to be reduced.
(C) From example 1 and comparative examples 4 to 6 it can be seen that:
in comparative examples 4, 5 and 6, when the doping amount of the soil reinforcing material is 5%, the 7d california bearing ratio of the reinforced soil test piece is not higher than 20%, the 7d non-immersed non-confined compressive strength is lower than 1.0Mpa, the 28d non-immersed non-confined compressive strength is lower than 2.0Mpa, the 7d immersed residual strength ratio is lower than 55%, and the 28d immersed residual strength ratio is lower than 85%.
In comparative examples 4, 5 and 6, when the doping amount of the soil reinforcing material is 10%, the 7d california bearing ratios of the reinforced soil test pieces are all lower than 35%, the 7d non-immersed unconfined compressive strength is lower than 1.5Mpa, the 28d non-immersed unconfined compressive strength is lower than 2.5Mpa, the 7d immersed residual strength ratio is lower than 60%, and the 28d immersed residual strength ratio is lower than 85%.
Compared with example 1, no cement is added in comparative example 4, no quicklime is added in comparative example 5, and fly ash is used to replace cement and quicklime in comparative example 6. According to the analysis, the cement and the quicklime can influence the reinforcement performance of the soil body reinforcement material, and the mechanical properties of the soil body test piece after reinforcement are not ideal due to the fact that the cement and the quicklime are not added or other components are used for replacing the cement and the quicklime.
(D) From examples 1 to 4 and comparative examples 1 to 6, it can be seen that:
the mechanical properties of the soil body test piece after reinforcement in the comparative example 4 are more special, the 7d California bearing ratio, the 7d non-soaking unconfined compressive strength value and the 7d soaking residual strength ratio are all lower than those of the comparative examples 1, 2, 3 and 5, but the 28d non-soaking unconfined compressive strength value and the 28d soaking residual strength ratio are higher than those of the comparative examples 1, 2, 3 and 5.
The main reason for the above phenomenon is that the soil reinforcing material in comparative example 4 lacks cement components and is difficult to form effective hydration reaction at early stage, but because the soil reinforcing material contains high-activity calcined oil shale semi-coke fine material, weak alkali environment can be formed in the hydrolysis and carbonization process of quicklime, so that slow pozzolanic reaction occurs, and then hydration product with good strength is formed. Therefore, the mechanical properties of the reinforced soil test piece in the comparative example 4 show the characteristics of poor early-stage performance and good later-stage performance, and the mechanical properties of the reinforced soil test piece in the comparative example 4 are wholly lower than those of the examples 1 to 4.
The mechanical properties of the reinforced soil test piece in the comparative example 5 are different from those of the reinforced soil test piece in the comparative example 4, and the early mechanical properties of the reinforced soil test piece are basically equivalent to those of the reinforced soil test pieces in the comparative examples 1, 2 and 3, mainly due to the early strength generated by cement hydration reaction; the later-stage mechanical property is slightly lower than that of the comparative example 4, but is obviously better than that of the comparative examples 1, 2 and 3, and mainly because the soil body reinforcing material contains high-activity calcined oil shale semi-coke fine materials, slow pozzolan reaction can occur in a weak alkaline environment after cement hydration, and a hydration product with good strength is formed. Therefore, the reinforced soil test piece in the comparative example 5 has certain mechanical strength in the early stage and the later stage, but the volcanic ash reaction is less due to the weak alkali environment, and the mechanical property of the reinforced soil test piece in the comparative example 5 is wholly lower than that of the soil test pieces in the examples 1 to 4.
The early-stage mechanical property and the later-stage mechanical property of the reinforced soil body test piece in the comparative example 6 are the worst, and the reinforced soil body test piece after being soaked in water is completely collapsed without any strength, and the main reason is that the calcined oil shale semicoke fine material and the fly ash belong to inert gelled materials, and can only generate the pozzolanic reaction in an alkaline environment and can not generate the hydration reaction in a neutral environment. In comparative example 6, the soil solidification material only exerts a physical improvement effect and fails to exert a hydration and consolidation effect, so that the mechanical property of the soil test piece reinforced in comparative example 6 is the worst, and the soil test piece reinforced after being soaked in water has no strength.
(D) From example 1 and comparative examples 1 to 6, it can be seen that:
compared with example 1, the main reasons why the performance of the soil reinforcing material is not ideal in comparative examples 1 to 6 are: after the soil body reinforcing material is doped into the loess, the reinforcing material can improve the strength and the water immersion resistance of the loess by mainly combining the hydration condensation reaction of substances such as cement, quicklime or fly ash and the like through physical factors such as particle size, surface charge and the like, and can improve the mechanical properties of the loess to a certain degree. However, since the soil reinforcing materials of comparative examples 1 to 6 contained active Al2O3And active SiO2The content is extremely low, so that effective volcanic ash reaction cannot be formed, the structural strength is integrally low, and the soil body reinforcement effect is not ideal.
(E) According to the analysis, the preparation method of the oil shale semicoke-based soil body reinforcing material provided by the invention has the advantages that the oil shale semicoke is calcined at a proper calcination temperature, and then the calcined oil shale semicoke is ground into fine particles, so that the active Al can be obtained2O3And active SiO2High content of calcined oil shale semi-coke fine material. The oil shale semicoke-based soil body reinforcing material prepared by calcining the oil shale semicoke fine material, the cement and the quick lime can play a remarkable role in reinforcing a solidified soil body when being used as a soil body reinforcing material, and has wide application prospect in road structure layers (such as road pavement layers, road foundation layers and the like).

Claims (10)

1. The oil shale semicoke-based soil body reinforcing material is characterized by comprising the following raw materials: calcining the oil shale semi-coke fine material, cement and quicklime;
the preparation method of the calcined oil shale semicoke fine material comprises the following steps: calcining the oil shale semi-coke in air to prepare calcined oil shale semi-coke, wherein the calcining temperature is 400-700 ℃; and grinding the prepared calcined oil shale semicoke to prepare a calcined oil shale semicoke fine material.
2. The oil shale semicoke-based soil reinforcement material of claim 1, wherein the calcined oil shale semicoke fines comprise active Al2O3And active SiO2(ii) a The active Al2O3And active SiO2The sum of the contents of the calcined oil shale semi-coke fine material is more than or equal to 5 percent;
the particle size distribution of the calcined oil shale semi-coke fine material is that D50 is less than or equal to 30 mu m, and D90 is less than or equal to 100 mu m.
3. The oil shale semicoke-based soil mass reinforcing material of claim 2, wherein the active Al is2O3And active SiO2The sum of the contents of the calcined oil shale semi-coke fine material is 6 to 6.9 percent.
4. The oil shale semicoke-based soil reinforcement material as claimed in claim 1, wherein the preparation method of the calcined oil shale semicoke fine material comprises: calcining the oil shale semi-coke in air to obtain calcined oil shale semi-coke, wherein the calcining temperature is 400-700 ℃, the calcining time is 10-30 min, and the heating rate is 15-25 ℃/min; and grinding the prepared calcined oil shale semicoke for 20-40 min to obtain a calcined oil shale semicoke fine material.
5. The oil shale semicoke-based soil reinforcement material of claim 4, wherein the oil shale semicoke comprises Al2O3And SiO2(ii) a The Al is2O3The content of the SiO in the oil shale semicoke is more than 18 percent2The content of the oil shale semicoke is more than 30 percent.
6. The oil shale semicoke-based soil reinforcement material as claimed in claim 1, which is prepared from the following raw materials in percentage by mass: 75-90% of calcined oil shale semi-coke fine material, 3-8% of cement, 6-20% of quicklime, and the sum of the mass percentages of the raw materials is 100%.
7. The oil shale semicoke-based soil reinforcement material as claimed in claim 6, which comprises the following raw materials by mass percent: the calcined oil shale semicoke fine material accounts for 83.3-85.1 percent, the cement accounts for 4.2-6.4 percent, the quicklime accounts for 8.5-12.5 percent, and the sum of the mass percentages of the raw materials is 100 percent.
8. The preparation method of the oil shale semicoke-based soil reinforcement material as claimed in any one of claims 1 to 7, characterized in that the oil shale semicoke-based soil reinforcement material is prepared by mixing and uniformly stirring the prepared calcined oil shale semicoke fine material, cement and quicklime.
9. Use of the oil shale semicoke-based soil reinforcement material as defined in any one of claims 1 to 7 as a soil reinforcement material in a road structure layer.
10. The application of the oil shale semicoke-based soil reinforcement material as a soil reinforcement material in a road structure layer according to claim 9, which is characterized in that the application comprises the following specific processes: uniformly mixing the oil shale semicoke-based soil body reinforcing material, the solidified soil body and water to prepare a reinforced soil body material, wherein the mass of the oil shale semicoke-based soil body reinforcing material is 5-10% of that of the solidified soil body; uniformly paving the prepared reinforced soil body material, and compacting, wherein the compaction degree is 96%; and curing for seven days after compaction to finish the construction of the road structure layer.
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