CN115504738A - Pavement material of coal liquefaction residue based geopolymer emulsified asphalt mixture and preparation method thereof - Google Patents
Pavement material of coal liquefaction residue based geopolymer emulsified asphalt mixture and preparation method thereof Download PDFInfo
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
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- 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
- C04B28/04—Portland cements
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- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
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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
- 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
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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
- 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
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Abstract
The invention relates to the technical field of green and environment-friendly road materials, and particularly discloses a road surface material of a coal liquefaction residue based geopolymer emulsified asphalt mixture and a preparation method thereof. The mixture pavement material of the invention is prepared from the following raw materials: aggregate, emulsified asphalt, activated coal liquefaction residue, an alkali activator, cement and external water; the activation of the coal liquefaction residues is to thermally activate the coal liquefaction residues at 850-900 ℃ and mechanically activate the coal liquefaction residues by a shear grinding machine, and then take the part with the particle size of less than 75 mu m; the alkali activator is used for generating a cementing material through a polymerization reaction with the activated coal liquefaction residues, and completely or partially replaces cement. The mixture pavement material disclosed by the invention is simple in preparation process, needs less equipment, can be used for treating a large amount of solid wastes such as coal liquefaction residues and the like, is used for replacing cement in the field of pavement materials, is low in cost, greatly reduces energy consumption and environmental pollution caused by cement production, and is much higher in thermal stability than cement.
Description
Technical Field
The invention relates to the technical field of green and environment-friendly road materials, in particular to a road surface material of a coal liquefaction residue based geopolymer emulsified asphalt mixture and a preparation method thereof.
Background
Coal is a fossil resource with the most abundant accumulation amount and the widest distribution region on the earth, coal liquefaction residues are solid wastes generated in the process of efficiently and cleanly utilizing the coal resources and account for about 30 percent of the total amount of raw coal, and a large amount of coal liquefaction residues are treated by methods such as stacking, burning, hydrogenation liquefaction, destructive distillation and the like, so that the operation is complicated, the cost is high, the resource waste is caused, and the ecological environment is greatly damaged. The coal liquefaction residue consists of high-boiling-point organic matters and inorganic ash with high carbon content, the utilization mode of the coal liquefaction residue is mainly concentrated on organic matters or extracts at present, and the research on inorganic minerals is less. Research shows that coal liquefaction residues contain a large amount of SiO 2 And CaO and the like, and the content of inorganic matters is high, so that finding out the utilization method of the inorganic mineral components in the coal liquefaction residues has important significance for efficiently, cleanly and comprehensively utilizing the coal liquefaction residue wastes.
The geopolymer material is a mixture which is composed of industrial solid waste taking Si and Al as main elements and NaOH or other alkali metal silicate solution as an activator, and generates a three-dimensional network structure of silicon-oxygen tetrahedron and aluminum-oxygen tetrahedron through geopolymerization, has excellent mechanical property and durability, and is a novel cementing material capable of replacing cement. Researches find that the coal liquefaction residues are rich in Si element, can be used as geopolymer precursors, and also provides a better idea for solving the problems.
At present, the highway asphalt pavement of China has entered into the major and middle repair period successively, the recycling of waste asphalt needs a large amount of emulsified asphalt to replace hot asphalt as a cementing material, the evaporation of water in the emulsified asphalt mixture needs a long time, so that the early strength of the emulsified asphalt is low, and the emulsified asphalt is produced by cement.
Therefore, there is a need to develop a formula of a geopolymer emulsified asphalt material based on coal liquefaction residues, so that the coal liquefaction residues can be efficiently, cleanly and comprehensively utilized, and the problems of energy consumption, environmental pollution and the like caused by cement use are solved.
Disclosure of Invention
The invention aims to provide a road surface material of a coal liquefaction residue based geopolymer emulsified asphalt mixture and a preparation method thereof, which solve the problems of complex utilization method, low utilization rate and the like of solid wastes of the coal liquefaction residue on the one hand, fully utilize inorganic substances such as Si, al and the like with large content in the solid wastes, realize resource utilization, achieve high-efficiency utilization of the wastes, and improve economic benefits on the premise of improving the environmental quality; on the other hand, the emulsified asphalt mixture can be applied to emulsified asphalt mixtures instead of cement, so that the strength of the emulsified asphalt mixtures is further improved, and the pavement performances such as the splitting strength, the Marshall stability and the like of the cement emulsified asphalt mixtures are greatly improved.
In order to achieve the technical purpose, the invention adopts the following technical scheme:
a coal liquefaction residue based geopolymer emulsified asphalt mixture pavement material is prepared from the following raw materials: aggregate, emulsified asphalt, activated coal liquefaction residue, an alkali activator, cement and external water;
the aggregate is an asphalt pavement reclaimed material;
the activation of the coal liquefaction residues is to firstly carry out primary thermal activation on the coal liquefaction residues at 850-900 ℃ for 30-50 min, then carry out mechanical activation on the primary thermal activation coal liquefaction residues through a shear grinding machine, and take the part with the particle size smaller than 75 mu m;
the alkali activator is used for generating a cementing material through a polymerization reaction with the activated coal liquefaction residues, and completely or partially replaces cement.
The alkali activator is prepared by adding NaOH solid into sodium silicate solution; the modulus and the mixing amount of the alkali activator are selected by adopting the principle of maximum compressive strength of the polymer neat slurry based on the coal liquefaction residues, wherein the polymer neat slurry based on the coal liquefaction residues is prepared by uniformly stirring the activated coal liquefaction residues, the alkali activator and water, and the water-solid ratio of the polymer neat slurry based on the coal liquefaction residues is 0.35.
Preferably, the pavement material of the coal liquefaction residue based geopolymer emulsified asphalt mixture is prepared from the following raw materials in parts by weight:
4000 parts of aggregate;
136 parts of emulsified asphalt;
0-80 parts of activated coal liquefaction residues;
0-40 parts of an alkali activator;
0-60 parts of cement;
0-60 parts of mineral powder;
101 to 121 portions of water are added externally.
More preferably, the pavement material of the coal liquefaction residue based geopolymer emulsified asphalt mixture is prepared from the following raw materials in parts by weight:
4000 parts of aggregate;
136 parts of emulsified asphalt;
52-68 parts of activated coal liquefaction residues;
26-34 parts of an alkali activator;
18-42 parts of cement;
0-60 parts of mineral powder;
104-108 parts of water is added externally.
More preferably, the pavement material of the coal liquefaction residue based geopolymer emulsified asphalt mixture is prepared from the following raw materials in parts by weight:
4000 parts of aggregate;
136 parts of emulsified asphalt;
60 parts of activated coal liquefaction residues;
30 parts of an alkali activator;
30 parts of cement;
0-60 parts of mineral powder;
106 parts of water is added externally.
Preferably, the aggregate is recycled asphalt pavement, and the grading of the recycled asphalt pavement is adjusted so that the particle diameters of 19-26.5 mm, 9.5-19 mm, 4.75-9.5 mm, 2.36-4.75 mm, 0.3-2.36 mm and 0.075-0.3 mm account for 7%, 30%, 24%, 16%, 11% and 12%, respectively.
Preferably, the emulsified asphalt has a penetration degree of 50-130 (1/10 mm) at 25 ℃, a softening point of more than 45 ℃, an extensibility of more than 40cm at 15 ℃, and a solid content of 50-70%.
Preferably, the activated coal liquefaction residue is obtained by performing primary thermal activation on the coal liquefaction residue at 850-900 ℃ for 30-50 min, performing mechanical activation on the primary thermal activation coal liquefaction residue by a shear grinding machine, and taking a part with the particle size of less than 75 microns.
Preferably, the alkali activator is prepared by adding NaOH solid to sodium silicate solution; the NaOH solid is 95% analytically pure and flaky; the initial modulus of the sodium silicate solution is 2.2-3.2, and the mass concentration is 40-50%; the modulus of the alkali activator is 1.4, and the alkali activator accounts for 50% of the mass of the activated coal liquefaction residue.
Preferably, portland cement P.O 42.5.42.5 is used as the cement.
Preferably, the mineral powder is limestone powder with a particle size of less than 75 μm.
Preferably, the externally added water is selected from municipal tap water, the externally added water is added step by step, one part of externally added water is firstly used for preparing the geopolymer neat slurry of the coal liquefaction residue, and the other part of externally added water is added according to the optimal water content obtained by a compaction test.
The invention also provides a preparation method of the coal liquefaction residue based geopolymer emulsified asphalt mixture pavement material, which comprises the following steps:
(1) Aggregate gradation preparation
According to JTG/T5521-2019 'technical Specification for road asphalt pavement regeneration', medium-grain grading is adopted, a grading curve of the medium-grain grading is shown as figure 1, and grading of asphalt pavement reclaimed materials is configured;
(2) Activated coal liquefaction residue
a) Heating the coal liquefaction residue from room temperature to 850-900 ℃ at the heating rate of 5 ℃/min, and then preserving the heat for 30-50 min to obtain the primary activated coal liquefaction residue;
b) Mechanical activation of coal liquefaction residues
Taking the primarily activated coal liquefaction residue obtained in the step a), grinding the primarily activated coal liquefaction residue by a shear type grinder, and screening the primarily activated coal liquefaction residue into a grade below 75 microns for later use;
(3) Preparation of alkali activator
Adjusting the target modulus by adding NaOH solid into sodium silicate solution, wherein the amount of NaOH solid is calculated by the following formula:
χ(Na 2 O·μSiO 2 )+(2μ-2χ)NaOH→μ(Na 2 O·χSiO 2 )+…
thus preparing a mass of y All The mixing amount of the sodium silicate solution in the alkali activator is
The mixing amount of NaOH solid in the alkali activator is
Wherein mu is the initial modulus of the sodium silicate solution, chi is the target modulus of the alkali activator, omega is the mass concentration of the sodium silicate solution, and y All Is the mass of the alkali activator;
(4) Preparation of neat geopolymer slurry
Uniformly stirring the activated coal liquefaction residue, an alkali activator and additional water to prepare coal liquefaction residue-based geopolymer neat paste, wherein the water-solid ratio of the coal liquefaction residue-based geopolymer neat paste is 0.35;
(5) Coal liquefaction residue geopolymer emulsified asphalt mixture compaction test
Adding graded aggregate, cement, mineral powder, coal liquefaction residue based polymer neat paste and emulsified asphalt into a mixer in sequence for uniform mixing, adding water with different masses, preparing 5-6 Marshall test pieces with different water contents, weighing the mass of the Marshall test pieces after forming, fitting a water content-density quadratic curve, and obtaining the optimal water content, namely the externally-added water content in the mixture;
(6) Preparation of coal liquefaction residue based geopolymer emulsified asphalt mixture
Adding the graded aggregate and additional water (the content of which is determined according to the compaction test in the step (5)) into a stirring pot, stirring for 90s, then adding cement and mineral powder, stirring for 90s, then adding the coal liquefaction residue based geopolymer neat slurry, stirring for 90s to fully mix, finally adding emulsified asphalt, stirring for 90s to prepare a coal liquefaction residue based geopolymer emulsified asphalt mixture, further preparing a Marshall test piece, and placing the test piece in a 60 ℃ temperature environment for curing for 48h.
Preferably, the target modulus and the doping amount of the alkali-activator in the step (3) are selected from the modulus and the doping amount when the compressive strength of the base polymer neat slurry 28d age in the coal liquefaction residue is the maximum.
Compared with the prior art, the invention has the following advantages and beneficial effects:
the method has the advantages of simple process, less required equipment, capability of treating a large amount of solid wastes such as coal liquefaction residues and the like, capability of treating more than 1.8t of coal liquefaction residues in every 100t of emulsified asphalt mixture pavement materials, and simple and convenient mode, lower cost and higher utilization rate compared with the traditional coal liquefaction residue treatment mode. The prepared geopolymer neat paste has higher strength, can replace cement to be used for emulsified asphalt, greatly reduces energy consumption and environmental pollution caused by cement production, and has higher thermal stability than cement.
Drawings
FIG. 1 is a grading curve of recycled asphalt pavement as aggregate;
FIG. 2 is a drawing of a test piece prepared by the present invention.
Detailed Description
The technical solution of the present invention is clearly and completely described below with reference to specific embodiments.
The raw materials used in the examples and comparative examples are as follows:
(1) Aggregate material
The aggregate is recycled asphalt pavement recycled materials of a certain section of Shanxi Qingxu road, and medium-grain grading is adopted according to JTG/T5521-2019 technical Specification for regenerating asphalt pavement of highways, and grading curves of the medium-grain grading are shown in figure 1, so that grading of the recycled asphalt pavement is configured; the grain sizes of 19-26.5 mm, 9.5-19 mm, 4.75-9.5 mm, 2.36-4.75 mm, 0.3-2.36 mm and 0.075-0.3 mm in the gradation are respectively 7%, 30%, 24%, 16%, 11% and 12%.
(2) Coal liquefaction residue
The coal liquefaction residues are obtained from Shanxi Luan group, and the main chemical component content of the coal liquefaction residues is analyzed by X-ray fluorescence spectrum, and the results are shown in Table 1, wherein the main component is SiO 2 、Al 2 O 3 CaO and Fe 2 O 3 Etc. of SiO 2 And Al 2 O 3 The total content of (A) is more than 60%, and the copolymer can be used as a geopolymer precursor.
TABLE 1
And after the coal liquefaction residues are subjected to thermal activation and mechanical activation by a shear type grinder, taking the part with the particle size smaller than 75 mu m. The specific operation steps are as follows:
1) Heating the coal liquefaction residue from room temperature to 850 ℃ at the heating rate of 5 ℃/min, and then preserving the temperature for 30min to obtain primary activated coal liquefaction residue;
2) Mechanical activation of coal liquefaction residues
Grinding the primarily activated coal liquefaction residue obtained in the step 1) by a shear type grinder, and screening the primarily activated coal liquefaction residue into 0-75 mu m grades for later use.
(3) Emulsified asphalt
The emulsified asphalt has a penetration degree of 61.8 (1/10 mm) at 25 ℃, a softening point of 53.8 ℃, an extensibility of 40.13cm at 15 ℃ and a solid content of 65.8 percent.
(4) Cement
The cement is Portland cement P.O 42.5.42.5.
(5) Mineral powder
The mineral powder is limestone powder with particle size less than 75 μm.
Selection of alkali activator mixing amount and modulus
Uniformly stirring coal liquefaction residues with the particle size of less than 75 microns after thermal activation and mechanical activation, an alkali activator and tap water to prepare coal liquefaction residue based geopolymer neat paste, wherein the water-solid ratio of the coal liquefaction residue based geopolymer neat paste is 0.35; the coal liquefaction residue based geopolymer neat paste is further prepared into test pieces of 40mm multiplied by 160mm for carrying out the compression strength test.
The 28d compressive strength of the base polymer neat slurry containing coal liquefaction residues with different alkali-activator mixing amounts (i.e. the mass ratio of the alkali-activator to the coal liquefaction residues with the particle size of less than 75 μm after thermal activation and mechanical activation) was tested by controlling the modulus of the alkali-activator to be 1.0, as shown in table 2. It can be obtained that the compressive strength of the geopolymer neat paste is the maximum when the mixing amount of the alkali-activator is 50%.
The 28d compressive strength of the coal liquefaction residue geopolymer neat slurry with different alkali-activator modulus is tested by controlling the mixing amount of the alkali-activator to be 50%, and is shown in table 3. It can be obtained that the compressive strength of the geopolymer neat paste is the maximum at an alkali activator modulus of 1.4.
Therefore, using the principle of maximum compressive strength of geopolymer neat slurry 28d, the modulus of alkali-activator in each of the following examples is selected to be 1.4, and the amount of the alkali-activator is selected to be 50%.
TABLE 2
TABLE 3
Selection of mixing amount of emulsified asphalt
The aggregate, cement, mineral powder and emulsified asphalt are uniformly mixed, tap water (the optimum water content is determined by compaction test) is added to prepare a Marshall test piece with the diameter of 100mm multiplied by 63.5mm, the Marshall test piece is compacted for the second time after being cured for 48h at the temperature of 60 ℃ with a mould, and the fracture strength is tested after demoulding and cooling for 12 h.
Wherein the cement mixing amount (i.e. the mass ratio of the cement to the aggregate) is 2.5 percent, the mineral powder mixing amount (i.e. the mass ratio of the mineral powder to the aggregate) is 1.5 percent, and the splitting strength under different emulsified asphalt mixing amounts (i.e. the mass ratio of the emulsified asphalt to the aggregate) is tested to be 3.0 to 3.8 percent. As a result, as shown in Table 4, it was found that the maximum cleavage strength was obtained when the amount of the emulsified asphalt was 3.4%.
Therefore, the emulsified asphalt mixing amount of each example is 3.4% according to the principle that the cleavage strength of a test piece is the maximum.
TABLE 4
Example 1: a preparation method of a coal liquefaction residue based geopolymer emulsified asphalt mixture comprises the following steps:
(1) Preparation of alkali activator
To 22.4g of sodium silicate solution having a mass concentration of 45.6% and an initial modulus of 2.8, 3.6g of NaOH solid was added to prepare a total of 26g of an alkali activator having a modulus of 1.4.
(2) Preparation of coal liquefaction residue based geopolymer neat slurry
And (2) mixing 52g of coal liquefaction residues with particle sizes of less than 75 microns after thermal activation and mechanical activation with 26g of the alkali activator prepared in the step (1), adding 23g of tap water, and uniformly mixing to obtain 101g of coal liquefaction residue-based geopolymer neat slurry.
(3) Compaction test of geopolymer emulsified asphalt mixture
And (3) sequentially adding 4000g of aggregate, 42g of cement, 101g of coal liquefaction residue based geopolymer neat paste prepared in the step (2), 136g of emulsified asphalt and other raw materials into a mixer for uniform mixing, respectively adding 60g, 70g, 80g, 90g, 100g and 110g of tap water, preparing 6 groups of standard Marshall test pieces with different water contents by using a compaction test, respectively weighing the mass of the test pieces after molding, and fitting a water content-density secondary curve to obtain the optimal water content of 85g.
(4) Preparation of Geopolymer emulsified asphalt mixture
Adding 4000g of aggregate and 85g of tap water into a stirring pot, stirring for 90s, adding 42g of cement, stirring for 90s, adding 101g of coal liquefaction residue based geopolymer neat slurry prepared in the step (2), stirring for 90s, fully stirring the materials, adding 136g of emulsified asphalt, stirring for 90s, and preparing a coal liquefaction residue based geopolymer emulsified asphalt mixture, which is abbreviated as geopolymer emulsified asphalt mixture.
Example 2: a preparation method of a coal liquefaction residue based geopolymer emulsified asphalt mixture comprises the following steps:
(1) Preparation of alkali activator
To 25.9g of sodium silicate solution having a mass concentration of 45.6% and an initial modulus of 2.8, 4.1g of NaOH solid was added to prepare 30g in total of an alkali activator having a modulus of 1.4.
(2) Preparation of coal liquefaction residue based geopolymer neat slurry
Mixing 60g of coal liquefaction residues with particle sizes of less than 75 mu m after thermal activation and mechanical activation with 30g of alkali activator prepared in the step (1), adding 26g of tap water, and uniformly mixing to obtain 116g of coal liquefaction residue-based geopolymer neat slurry.
(3) Compaction test of geopolymer emulsified asphalt mixture
And (3) sequentially adding 4000g of aggregate, 30g of cement, 116g of coal liquefaction residue based geopolymer neat paste prepared in the step (2), 136g of emulsified asphalt and other raw materials into a mixer for uniform mixing, respectively adding 60g, 70g, 80g, 90g, 100g and 110g of tap water, preparing 6 groups of standard Marshall test pieces with different water contents by using a compaction test, respectively weighing the mass of the test pieces after molding, and fitting a water content-density secondary curve to obtain the optimal water content of 80g.
(4) Preparation of Geopolymer emulsified asphalt mixture
4000g of aggregate and 80g of tap water are added into a stirring pot and stirred for 90s, then 30g of cement is added and stirred for 90s, then 116g of coal liquefaction residue based geopolymer neat slurry prepared in the step (2) is added and stirred for 90s, the mixture is fully stirred, and finally 136g of emulsified asphalt is added and stirred for 90s to prepare a coal liquefaction residue based geopolymer emulsified asphalt mixture, which is abbreviated as geopolymer emulsified asphalt mixture.
Example 3: a preparation method of a coal liquefaction residue based geopolymer emulsified asphalt mixture comprises the following steps:
(1) Preparation of alkali activator
To 29.3g of sodium silicate solution having a mass concentration of 45.6% and an initial modulus of 2.8, 4.7g of NaOH solid was added to prepare a total of 34g of an alkali activator having a modulus of 1.4.
(2) Preparation of coal liquefaction residue based geopolymer neat slurry
68g of coal liquefaction residues with particle sizes of less than 75 microns after thermal activation and mechanical activation are mixed with 34g of the alkali activator prepared in the step (1), 30g of tap water is added, and the mixture is uniformly mixed to prepare 132g of coal liquefaction residue based geopolymer neat slurry.
(3) Compaction test of geopolymer emulsified asphalt mixture
And (3) sequentially adding 4000g of aggregate, 18g of cement, 132g of coal liquefaction residue based geopolymer neat paste prepared in the step (2), 136g of emulsified asphalt and other raw materials into a mixer for uniform mixing, respectively adding 50g, 60g, 70g, 80g, 90g and 100g of tap water, preparing 6 groups of standard Marshall test pieces with different water contents by using a compaction test, respectively weighing the mass of the test pieces after molding, and fitting a water content-density secondary curve to obtain the optimal water content of 74g.
(4) Preparation of Geopolymer emulsified asphalt mixture
4000g of aggregate and 74g of tap water are added into a stirring pot and stirred for 90s, then 18g of cement is added and stirred for 90s, then 132g of coal liquefaction residue based geopolymer neat slurry prepared in the step (2) is added and stirred for 90s, the mixture is fully stirred, and finally 136g of emulsified asphalt is added and stirred for 90s to prepare a coal liquefaction residue based geopolymer emulsified asphalt mixture, which is abbreviated as geopolymer emulsified asphalt mixture.
Example 4: a preparation method of a coal liquefaction residue based geopolymer emulsified asphalt mixture comprises the following steps:
(1) Preparation of alkali activator
To 34.5g of sodium silicate solution having a mass concentration of 45.6% and an initial modulus of 2.8 was added 5.5g of NaOH solid, to prepare a total of 40g of alkali-activator having a modulus of 1.4.
(2) Preparation of coal liquefaction residue based geopolymer neat slurry
And (2) mixing 80g of coal liquefaction residues with particle sizes of less than 75 microns after thermal activation and mechanical activation with 40g of the alkali activator prepared in the step (1), adding 35g of tap water, and uniformly mixing to obtain 155g of coal liquefaction residue-based geopolymer neat slurry.
(3) Compaction test of geopolymer emulsified asphalt mixture
4000g of aggregate, 155g of coal liquefaction residue based geopolymer neat paste, 136g of emulsified asphalt and other raw materials are sequentially added into a mixer to be mixed uniformly, 40g, 50g, 60g, 70g, 80g and 90g of tap water are respectively added, 6 groups of standard Marshall test pieces with different water contents are prepared by a compaction test, the mass of the standard Marshall test pieces is respectively weighed after the standard Marshall test pieces are formed, and a water content-density secondary curve is fitted to obtain the optimal water content of 66g.
(4) Preparation of Geopolymer emulsified asphalt mixture
And (3) adding 4000g of aggregate and 66g of tap water into a stirring pot, stirring for 90s, adding 155g of coal liquefaction residue based geopolymer neat slurry prepared in the step (2), stirring for 90s, fully stirring the materials, finally adding 136g of emulsified asphalt, and stirring for 90s to prepare a coal liquefaction residue based geopolymer emulsified asphalt mixture, which is abbreviated as geopolymer emulsified asphalt mixture.
Comparative example 1: a preparation method of cement-based geopolymer emulsified asphalt comprises the following steps:
(1) Compaction test of cement-emulsified asphalt mixture
4000g of aggregate, 60g of cement, 60g of mineral powder, 136g of emulsified asphalt and other raw materials are sequentially added into a mixer to be uniformly mixed, 100g, 110g, 120g, 130g, 140g and 150g of tap water are respectively added to prepare 6 groups of standard Marshall test pieces with different water contents, the mass of the standard Marshall test pieces is respectively weighed after the standard Marshall test pieces are formed, and a water content-density quadratic curve is fitted to obtain the optimal water content of 121g.
(2) Preparation of Cement-emulsified asphalt mixture
4000g of aggregate and 121g of tap water are added into a stirring pot and stirred for 90s, then 60g of cement and 60g of slag are added and stirred for 90s, the materials are fully stirred, and finally 136g of emulsified asphalt is added and stirred for 90s, so that the cement emulsified asphalt mixture is prepared.
Comparative example 2: a preparation method of a coal liquefaction residue based geopolymer emulsified asphalt mixture comprises the following steps:
(1) Preparation of alkali activator
To 25.9g of sodium silicate solution having a mass concentration of 45.6% and an initial modulus of 2.8, 4.1g of NaOH solid was added to prepare 30g in total of an alkali activator having a modulus of 1.4.
(2) Preparation of coal liquefaction residue based geopolymer neat slurry
And (2) mixing 60g of coal liquefaction residues with particle sizes of less than 75 microns after mechanical activation with 30g of the alkali activator prepared in the step (1), adding 26g of tap water, and uniformly mixing to obtain 116g of coal liquefaction residue-based geopolymer neat slurry.
(3) Compaction test of geopolymer emulsified asphalt mixture
And (3) sequentially adding 4000g of aggregate, 30g of cement, 116g of coal liquefaction residue based geopolymer neat paste prepared in the step (2), 136g of emulsified asphalt and other raw materials into a mixer for uniform mixing, respectively adding 60g, 70g, 80g, 90g, 100g and 110g of tap water, preparing 6 groups of standard Marshall test pieces with different water contents by using a compaction test, respectively weighing the mass of the test pieces after molding, and fitting a water content-density secondary curve to obtain the optimal water content of 80g.
(4) Preparation of Geopolymer emulsified asphalt mixture
4000g of aggregate and 80g of tap water are added into a stirring pot and stirred for 90s, then 30g of cement is added and stirred for 90s, then 116g of coal liquefaction residue based geopolymer neat slurry prepared in the step (2) is added and stirred for 90s, the mixture is fully stirred, and finally 136g of emulsified asphalt is added and stirred for 90s, so that a coal liquefaction residue based geopolymer emulsified asphalt mixture, namely a geopolymer emulsified asphalt mixture, is prepared.
The formulations of the coal liquefaction residue based geopolymer emulsified asphalt mixture prepared in examples 1 to 4 and the cement emulsified asphalt mixture prepared in comparative examples 1 to 2 are shown in the following table 5, and the units are g.
TABLE 5
Standard marshall test pieces with the size of phi 100mm multiplied by 63.5mm are prepared according to the combination ratio of the 5 groups of the above examples 1 to 4 and the comparative example, the standard marshall test pieces are subjected to secondary compaction after being cured for 48 hours at 60 ℃ with a mold, and are subjected to a void ratio test, a splitting strength test, a marshall stability test and the like after being demolded and cooled for 12 hours, the test method refers to standard JTGE20-2011, wherein the void ratio is obtained through a theoretical maximum relative density test (a vacuum method) and a capillary volume relative density test (a heavy-in-water method), and the calculation formula is shown as the following formula:
in the formula, VV is void ratio,%; gamma ray f The relative density of the gross volume of the asphalt mixture; gamma ray t Is the theoretical maximum relative density of the test piece.
The test pieces prepared are shown in fig. 2, and the test data are shown in table 6:
TABLE 6
As can be seen from examples 1-4 and comparative example 1, the coal liquefaction residue geopolymer is used for partially or completely replacing cement in emulsified asphalt, and the replacement of the coal liquefaction residue geopolymer partially enables various indexes such as porosity, splitting strength, stability and flow value of the geopolymer emulsified asphalt mixture to be better than those of the cement emulsified asphalt mixture; however, when the substitution rate of the coal liquefaction residues is 100%, the indexes are slightly worse than those of the cement emulsified asphalt. As can be seen from example 2 and comparative example 2, when the geopolymer based on the coal liquefaction residue after thermal activation is used in the emulsified asphalt, the change of the void ratio is not large, and indexes such as the splitting strength, the stability, the flow value and the like are all superior to those of the geopolymer based emulsified asphalt based on the coal liquefaction residue after thermal activation.
Finally, it should be noted that: the above-mentioned embodiments are only specific embodiments of the present invention, which are used for illustrating the technical solutions of the present invention and are not limited thereto, and the protection scope of the present invention is not limited thereto, although the present invention is described in detail with reference to the foregoing embodiments, those skilled in the art should understand that: those skilled in the art can still make modifications or changes to the embodiments described in the foregoing embodiments, or make equivalent substitutions for some features, within the scope of the disclosure; such modifications, changes or substitutions do not depart from the spirit and scope of the embodiments of the present invention, and they should be construed as being included therein.
Claims (9)
1. A pavement material of a coal liquefaction residue based geopolymer emulsified asphalt mixture is characterized by comprising the following raw materials: aggregate, emulsified asphalt, activated coal liquefaction residue, an alkali activator, cement and external water;
the aggregate is an asphalt pavement reclaimed material;
the activation of the coal liquefaction residues is to perform primary thermal activation on the coal liquefaction residues at 850-900 ℃ for 30-50min, then perform mechanical activation on the primary thermal activation coal liquefaction residues through a shear grinding machine, and then take the part with the particle size smaller than 75 mu m;
the alkali activator is used for generating a cementing material through a polymerization reaction with the activated coal liquefaction residues, and completely or partially replaces cement.
2. The coal liquefaction residue based geopolymer emulsified asphalt mixture pavement material as claimed in claim 1, wherein the alkali activator is prepared by adding NaOH solid to sodium silicate solution; the modulus and the mixing amount of the alkali activator are selected by adopting the principle of maximum compressive strength of the polymer neat slurry based on the coal liquefaction residues, wherein the polymer neat slurry based on the coal liquefaction residues is prepared by uniformly stirring the activated coal liquefaction residues, the alkali activator and water, and the water-solid ratio of the polymer neat slurry based on the coal liquefaction residues is 0.35.
3. The pavement material of the coal liquefaction residue based geopolymer emulsified asphalt mixture as claimed in claim 2, which is prepared from the following raw materials in parts by weight:
4000 parts of aggregate;
136 parts of emulsified asphalt;
0 to 80 parts of activated coal liquefaction residues;
0 to 40 parts of alkali activator;
0 to 60 parts of cement;
0 to 60 parts of mineral powder;
adding water in 101-121 parts.
4. The coal liquefaction residue based geopolymer emulsified asphalt mixture pavement material as claimed in any one of claims 1 to 3, wherein the aggregate is an asphalt pavement reclaimed material, and the grading is adjusted so that the particle diameters of the aggregate are respectively 7%, 30%, 24%, 16%, 11% and 12% in the ranges of 19 to 26.5mm, 9.5 to 19mm, 4.75 to 9.5mm, 2.36 to 4.75mm, 0.3 to 2.36mm and 0.075 to 0.3mm.
5. The coal liquefaction residue based geopolymer emulsified asphalt mixture pavement material as claimed in any one of claims 1 to 3, wherein the emulsified asphalt has a penetration at 25 ℃ of 50 to 130 (1/10 mm), a softening point of more than 45 ℃ and an extensibility at 15 ℃ of more than 40cm, and the solid content is 50 to 70 percent.
6. The pavement material of the coal liquefaction residue based geopolymer emulsified asphalt mixture as claimed in any one of claims 1 to 3, wherein the cement is Portland cement P.O 42.5.5.
7. The coal liquefaction residue based geopolymer emulsified asphalt mixture pavement material as claimed in any one of claims 1 to 3, wherein the mineral powder is limestone powder with a particle size of less than 75 μm.
8. The pavement material of the coal liquefaction residue based geopolymer emulsified asphalt mixture as claimed in any one of claims 1 to 3, wherein the externally added water is municipal tap water; and adding the additional water step by step, wherein one part of the additional water is firstly used for preparing the coal liquefaction residue-based geopolymer neat paste, and the other part of the additional water is added according to the optimal water content obtained by the mixture compaction test.
9. A method for preparing a coal liquefaction residue based geopolymer emulsified asphalt mixture pavement material as claimed in any one of claims 1 to 8, which comprises the following steps: 1) Preparing coal liquefaction residue based geopolymer neat slurry: uniformly stirring the activated coal liquefaction residue, an alkali activator and additional water to obtain coal liquefaction residue-based geopolymer neat paste, wherein the water-solid ratio is 0.35; 2) The aggregate and the added water are stirred and mixed, wherein the added water amount is obtained by a mixture compaction test, then the cement and the mineral powder are added and stirred and mixed, then the coal liquefaction residue based geopolymer neat slurry is added and stirred and mixed, and finally the emulsified asphalt is added and stirred, so that the composite material is obtained.
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