CN105174824B - Coal directly-liquefied residue modified asphalt mixture and preparation method thereof - Google Patents
Coal directly-liquefied residue modified asphalt mixture and preparation method thereof Download PDFInfo
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Abstract
The invention discloses a kind of coal directly-liquefied residue modified asphalt mixture, the percentage by weight of its each constitutive material is gather materials 91 95%, miberal powder 1.5 4%, coal directly-liquefied residue modified pitch 3 5%.The invention also discloses a kind of preparation method of coal directly-liquefied residue modified asphalt mixture, its step is sequentially as follows：Prepare coal directly-liquefied residue modified pitch；By coal directly-liquefied residue modified pitch, gather materials is pre-processed with miberal powder；By the coal directly-liquefied residue modified pitch of different amounts and aggregate blending, miberal powder mix is added, prepare coal directly-liquefied residue modified asphalt mixture；By overall merit, the optimum amount of coal directly-liquefied residue modified pitch is determined；By the coal directly-liquefied residue modified pitch of optimum amount and aggregate blending, miberal powder mix is added, prepare coal directly-liquefied residue modified asphalt mixture.Technical scheme can make the coal directly-liquefied residue turn waste into wealth, with obvious economic benefit and social benefit.
Description
Technical field
The invention belongs to pavement construction material preparing technical field, and in particular to a kind of coal directly-liquefied residue modified pitch
Compound and preparation method thereof.
Background technology
Coal directly-liquefied residue (Direct Coal Liquefaction Residue, abbreviation DCLR) is DCL/Direct coal liquefaction
During the heavy byproduct that is inevitably generated, account for 30% or so of feed coal total amount.China will all produce a large amount of every year
Coal directly-liquefied residue, only Shenhua Group every year just produce 117.6 ten thousand tons.Such substantial amounts of coal directly-liquefied residue cannot
Rationally utilize, often directly as garbage disposal, cause the wasting of resources, while polluting environment.
From earlier 1970s, people begin to research coal directly-liquefied residue as modifying agent to asphalt performance
Influence.King stockaded village rosy clouds et al. have studied modifying function of the coal directly-liquefied residue to bi tumenf orr oad, it was found that straight by coal
It is No. 50 standards of pitch that connect the matrix pitch that liquefied residue was modified can meet needle penetration, and with coal directly-liquefied residue
The increase of addition, the softening point of modified pitch gradually rises, and needle penetration and ductility are in the trend for gradually reducing.Zhu Wei equality people
With coal directly-liquefied residue as asphalt modifier, addition, compounding process and the compounding temperature of coal directly-liquefied residue are have studied
Spend the influence to asphalt performance.Needle penetration, softening points of the He Liang to the modified pitch of the coal directly-liquefied residue of Different adding amount
Be tested with ductility, test result shows, its performance close to addition for 5%SBS modified pitch, as modifying agent adds
The increase of dosage, the viscosity of modified pitch is in rising trend.Zhang Yanrong have studied the direct liquid of modification temperature, modification time, coal
Change the influences of the factor to performance of modified bitumen such as the adding amount and adding way of residue, it was found that when adding for coal directly-liquefied residue
When dosage is 5%, you can meet No. 50 standards of pitch.
Application publication number is a kind of for the patent of invention of CN104788971A is disclosed to improve the modified drip of coal directly-liquefied residue
The method of blue or green cryogenic property, wherein the optimum addition of the coal directly-liquefied residue added in matrix pitch is 5.0%, and then
Coal directly-liquefied residue modified pitch is obtained, then improves its cryogenic property by adding other modifying agent.Although the patent of invention
The cryogenic property of coal directly-liquefied residue modified pitch well improved, but in the coal directly-liquefied residue modified pitch
On the basis of cannot prepare its compound, due to the addition or coal directly-liquefied residue modified pitch of coal directly-liquefied residue
Addition is difficult control, and also is difficult to regulation with the proportioning of other materials, therefore cannot prepare excellent road performance and in a balanced way
Compound.
In terms of the recycling of coal directly-liquefied residue, it has been recognized that can be asphaltogenic modified by its secondary development
Agent, mesophase pitch etc..Research to coal directly-liquefied residue at present is also rested in its research to asphalt modification effect, not
It is related to the research of coal directly-liquefied residue modified asphalt mixture.Therefore, it is necessary to develop a kind of coal directly-liquefied residue be modified
Asphalt and preparation method thereof, to improve the added value of coal directly-liquefied residue.
The content of the invention
To solve problems of the prior art, the present invention provides a kind of coal directly-liquefied residue modified pitch mixing
Material, containing gathering materials and miberal powder, also containing coal directly-liquefied residue modified pitch, each constitutive material accounts for the coal directly-liquefied residue
The percentage by weight of modified asphalt mixture is the 91-95% that gathers materials, miberal powder 1.5-4%, coal directly-liquefied residue modified pitch 3-
5%.
Coal directly-liquefied residue modified asphalt mixture of the invention can make the coal directly-liquefied residue turn waste into wealth, its road
The performance requirement of hot-mix asphalt mixture can be reached with performance, and its high-temperature behavior is even better than hot-mix asphalt mixture, because
This has obvious economic benefit and social benefit.
Preferably, the percentage by weight that each constitutive material accounts for the coal directly-liquefied residue modified asphalt mixture is,
Gather materials 91.3%, miberal powder 4%, coal directly-liquefied residue modified pitch 4.7%.
In any of the above-described scheme preferably, it is described to gather materials including coarse aggregate and fine aggregate.
In any of the above-described scheme preferably, the coarse aggregate and the quality proportioning of fine aggregate are 2.0-2.5:1.
In any of the above-described scheme preferably, the coarse aggregate includes the one kind in basalt, diabase and granite
Or it is several.
In any of the above-described scheme preferably, the fine aggregate include natural sand, Machine-made Sand and aggregate chips in one kind or
It is several.
In any of the above-described scheme preferably, the miberal powder includes the one kind or several in pulverized limestone, calcium hydroxide and cement
Kind.
The present invention also provides a kind of preparation side of the coal directly-liquefied residue modified asphalt mixture described in any of the above-described
Method, it is comprised the following steps according to sequencing：
Step one：Test coal directly-liquefied residue, matrix pitch, the properties gathered materials with miberal powder；
Step 2：Prepare coal directly-liquefied residue modified pitch；
Step 3：By coal directly-liquefied residue modified pitch, gather materials is pre-processed with miberal powder；
Step 4：By the coal directly-liquefied residue modified pitch of different amounts and aggregate blending, miberal powder mix is added, made
Standby coal directly-liquefied residue modified asphalt mixture；
Step 5：The properties of coal directly-liquefied residue modified asphalt mixture are tested, and carries out overall merit, it is determined that
The optimum amount of coal directly-liquefied residue modified pitch；
Step 6：By the coal directly-liquefied residue modified pitch of optimum amount and aggregate blending, miberal powder mix is added, made
Standby coal directly-liquefied residue modified asphalt mixture.
The present invention, as asphalt modifier, adds the coal of optimum addition from coal directly-liquefied residue in matrix pitch
Direct liquefaction residue, prepares coal directly-liquefied residue modified pitch, and the coal directly-liquefied residue that optimum amount is then chosen again changes
Property pitch, and gathers materials and miberal powder mix, prepares coal directly-liquefied residue modified asphalt mixture.DCL/Direct coal liquefaction of the invention is residual
It is the excellent performance of slag modified asphalt mixture, cheap, to improving the added value of coal directly-liquefied residue and its is secondary
Reasonable development has important Social benefit and economic benefit into asphalt.
Preferably, in the step 2, the preparation method of coal directly-liquefied residue modified pitch, it is according to sequencing
Comprise the following steps：
Step (1)：The coal directly-liquefied residue of Different adding amount is added in matrix pitch, coal directly-liquefied residue is prepared
Modified pitch；
Step (2)：Coal directly-liquefied residue is evaluated using needle penetration grading evaluation system and PG grading evaluation systems jointly
The performance of modified pitch, determines the optimum addition of coal directly-liquefied residue；
Step (3)：The coal directly-liquefied residue of optimum addition is added in matrix pitch, coal directly-liquefied residue is prepared
Modified pitch.
Needle penetration grading evaluation system, is to determine weather conditions and load that pitch adapted to according to the size of Asphalt Penetration
Lotus condition.The referring mainly to of needle penetration grading evaluation system indicates needle penetration, ductility, softening point etc., and auxiliary characteristics have flash-point, quality
Loss, residual penetration ratio, residual ductility etc..Wherein, the technical indicator of pitch should meet《Asphalt highway construction technology is advised
Model》Relevant technical stipulation in (JTG F40-2004).
PG grading evaluation systems, are classified according to the pavement performance of pitch, are directly represented using design temperature in use
The scope of application, the performance of pitch is determined using DSR experiments and BBR experiments.DSR is tested, i.e. DSR test, for surveying
Determine the viscoplasticity of pitch.Used as viscoelastic material, it has the characteristic of elastomeric material and the characteristic of cohesive material to pitch simultaneously, this
Relation between two kinds of characteristics is used to evaluate the permanent deformation resistance and antifatigue cracking ability of cementitious matter.For anti-car
Rut, cementitious matter needs hard and flexible；For antifatigue cracking, cementitious matter needs soft and toughness.Pitch elasticity with
Balance between viscosity is very important.BBR is tested, i.e. bent beam rheological test, for determining pitch girder test specimen low
Stiffness under warm creep loading effect.
In any of the above-described scheme preferably, the optimum addition of the coal directly-liquefied residue is 10%.
In any of the above-described scheme preferably, the heating-up temperature of the matrix pitch is 110-130 DEG C, and the coal is direct
The heating-up temperature of liquefied residue is 170-190 DEG C；The matrix pitch is with the mix temperature of the coal directly-liquefied residue
150-160 DEG C, duration of mixing be 1-2h.
In any of the above-described scheme preferably, in the step 3, the preheating temperature of coal directly-liquefied residue modified pitch
Spend for 150-160 DEG C, preheating time are 2-3h.
In any of the above-described scheme preferably, in the step 3, the preheating temperature gathered materials is 155-185 DEG C, preheating
Time is 4-5h.
In any of the above-described scheme preferably, in the step 3, the preheating temperature of miberal powder is 155-185 DEG C, preheats
Time is 4-5h.
In any of the above-described scheme preferably, in the step 4, coal directly-liquefied residue modified pitch with gather materials
Mix temperature is 145-175 DEG C, duration of mixing is 60-90s；It is 145-175 DEG C, duration of mixing to add the mix temperature after miberal powder
It is 60-90s.
In any of the above-described scheme preferably, in the step 6, the modified drip of coal directly-liquefied residue of optimum amount
Mix temperature that is blue or green and gathering materials is 145-175 DEG C, duration of mixing is 60-90s；It is 145-175 to add the mix temperature after miberal powder
DEG C, duration of mixing be 60-90s.
The preparation method of coal directly-liquefied residue modified asphalt mixture of the invention, its mentality of designing is unique, technique letter
Single, simple operation, parameter and condition in proportioning, each step of above-mentioned each constitutive material have synergy, by each composition
The optimum combination of the proportioning of raw material, each parameter and condition realizes the preparation of coal directly-liquefied residue modified asphalt mixture, and
And its pavement performance is good, balanced, with important Social benefit and economic benefit.
Brief description of the drawings
Fig. 1 is to be preferable to carry out according to the one of coal directly-liquefied residue modified asphalt mixture of the invention and preparation method thereof
The process chart of example；
Fig. 2 is real shown in Fig. 1 according to coal directly-liquefied residue modified asphalt mixture of the invention and preparation method thereof
Apply the graph of a relation between the coal directly-liquefied residue modified pitch consumption of example and bulk density；
Fig. 3 is real shown in Fig. 1 according to coal directly-liquefied residue modified asphalt mixture of the invention and preparation method thereof
Apply the graph of a relation between the coal directly-liquefied residue modified pitch consumption of example and stability；
Fig. 4 is real shown in Fig. 1 according to coal directly-liquefied residue modified asphalt mixture of the invention and preparation method thereof
Apply the graph of a relation between the coal directly-liquefied residue modified pitch consumption of example and voidage；
Fig. 5 is real shown in Fig. 1 according to coal directly-liquefied residue modified asphalt mixture of the invention and preparation method thereof
Apply the graph of a relation between the coal directly-liquefied residue modified pitch consumption of example and flow valuve；
Fig. 6 is real shown in Fig. 1 according to coal directly-liquefied residue modified asphalt mixture of the invention and preparation method thereof
Apply the graph of a relation between the coal directly-liquefied residue modified pitch consumption of example and void in mineral aggregate；
Fig. 7 is real shown in Fig. 1 according to coal directly-liquefied residue modified asphalt mixture of the invention and preparation method thereof
Apply the graph of a relation between the coal directly-liquefied residue modified pitch consumption of example and pitch saturation degree.
Specific embodiment
In order to be further understood that the content of the invention of the invention, the present invention is elaborated below in conjunction with specific embodiment.
Embodiment one：
According to an embodiment of coal directly-liquefied residue modified asphalt mixture of the invention, it contains and gathers materials and miberal powder,
Also contain coal directly-liquefied residue modified pitch, each constitutive material accounts for the weight of the coal directly-liquefied residue modified asphalt mixture
Amount percentage is gather materials 91.3%, miberal powder 4%, coal directly-liquefied residue modified pitch 4.7%.
Described to gather materials including coarse aggregate and fine aggregate, coarse aggregate is 2.2 with the quality proportioning of fine aggregate:1.The coarse aggregate
It is basalt, the fine aggregate is Machine-made Sand, the miberal powder is pulverized limestone.
The coal directly-liquefied residue modified asphalt mixture of the present embodiment can make the coal directly-liquefied residue turn waste into wealth, its
Pavement performance can reach the performance requirement of hot-mix asphalt mixture, and its high-temperature behavior is even better than hot-mix asphalt mixture,
Therefore there is obvious economic benefit and social benefit.
As shown in figure 1, the preparation method of the coal directly-liquefied residue modified asphalt mixture of the present embodiment, it is according to successively
Order is comprised the following steps：
Step one：Test coal directly-liquefied residue, matrix pitch, the properties gathered materials with miberal powder；
Step 2：Prepare coal directly-liquefied residue modified pitch；
Step 3：By coal directly-liquefied residue modified pitch, gather materials is pre-processed with miberal powder；
Step 4：By the coal directly-liquefied residue modified pitch of different amounts and aggregate blending, miberal powder mix is added, made
Standby coal directly-liquefied residue modified asphalt mixture；
Step 5：The properties of coal directly-liquefied residue modified asphalt mixture are tested, and carries out overall merit, it is determined that
The optimum amount of coal directly-liquefied residue modified pitch；
Step 6：By the coal directly-liquefied residue modified pitch of optimum amount and aggregate blending, miberal powder mix is added, made
Standby coal directly-liquefied residue modified asphalt mixture.
The present embodiment, as asphalt modifier, adds optimum addition from coal directly-liquefied residue in matrix pitch
Coal directly-liquefied residue, prepares coal directly-liquefied residue modified pitch, and the DCL/Direct coal liquefaction that optimum addition is then chosen again is residual
Slag modified pitch, and gathers materials and miberal powder mix, prepares coal directly-liquefied residue modified asphalt mixture, its excellent performance, price
It is cheap, to improving the added value of coal directly-liquefied residue and its secondary reasonable development being had into important society into asphalt
Can benefit and economic benefit.
In the step one, coal directly-liquefied residue, matrix pitch (SK-90 pitches), the properties gathered materials with miberal powder
Test is respectively as shown in table 1.1, table 1.2, table 1.3-1.7 and table 1.8.
The performance of the coal directly-liquefied residue of table 1.1
| Test event | Softening point (DEG C) | 25 DEG C of needle penetrations (0.1mm) | |
| Test result | 1.23 | 170 | 2 |
The performance of the matrix pitch of table 1.2 (SK-90 pitches)
The 16-26.5mm coarse aggregate test results of table 1.3
| Test event | Unit | Technical requirements | Test result | Method of testing |
| Apparent relative density | - | ≥2.60 | 2.805 | T0304 |
| Bulk specific gravity | - | - | 2.703 | T0304 |
| Water absorption rate | % | ≤2.0 | 1.35 | T0304 |
| Los Angeles abrasion loss | % | 28 | 15.4 | T0317 |
| Adhesion | Level | ≥4 | 4 | T0616 |
| Flat-elongated particles content (compound) | % | ≤15 | - | T0312 |
| Wherein particle diameter is more than 9.5mm | % | ≤12 | 4.6 | T0312 |
| Wherein particle diameter is less than 9.5mm | % | ≤18 | - | T0312 |
| WATER-WASHING METHOD<0.075mm granule contents | % | ≤1 | 0.4 | T0310 |
The 9.5-16mm coarse aggregate test results of table 1.4
| Test event | Unit | Technical requirements | Test result | Method of testing |
| Apparent relative density | - | ≥2.60 | 2.803 | T0304 |
| Bulk specific gravity | - | - | 2.664 | T0304 |
| Water absorption rate | % | ≤2.0 | 1.86 | T0304 |
| Building stones crush values | % | ≤28 | 12.6 | T0316 |
| Los Angeles abrasion loss | % | ≤30 | 15.4 | T0317 |
| Adhesion | Level | ≥3 | 4 | T0616 |
| Flat-elongated particles content (compound) | % | ≤18 | - | T0312 |
| Wherein particle diameter is more than 9.5mm | % | ≤15 | 7.8 | T0312 |
| Wherein particle diameter is less than 9.5mm | % | ≤20 | - | T0312 |
| WATER-WASHING METHOD<0.075mm granule contents | % | ≤1 | 0.8 | T0310 |
The 4.75-9.5mm coarse aggregate test results of table 1.5
| Test event | Unit | Technical requirements | Test result | Method of testing |
| Apparent relative density | - | ≥2.60 | 2.818 | T0304 |
| Bulk specific gravity | - | - | 2.683 | T0304 |
| Water absorption rate | % | ≤2.0 | 1.79 | T0304 |
| Flat-elongated particles content (compound) | % | ≤15 | - | T0312 |
| Wherein particle diameter is more than 9.5mm | % | ≤12 | - | T0312 |
| Wherein particle diameter is less than 9.5mm | % | ≤18 | 6.4 | T0312 |
| WATER-WASHING METHOD<0.075mm granule contents | % | ≤3 | 0.6 | T0310 |
The 2.36-4.75mm coarse aggregate test results of table 1.6
| Test event | Unit | Technical requirements | Test result | Method of testing |
| Apparent relative density | - | ≥2.60 | 2.813 | T0330 |
| Bulk specific gravity | - | - | 2.669 | T0330 |
| Water absorption rate | % | ≤2.0 | 1.92 | T0304 |
| WATER-WASHING METHOD<0.075mm granule contents | % | ≤3 | 0.9 | T0310 |
The 0-2.36mm fine aggregate test results of table 1.7
| Test event | Unit | Technical requirements | Test result | Method of testing |
| Apparent relative density | - | ≥2.50 | 2.805 | T0330 |
| Bulk specific gravity | - | - | 2.671 | T0330 |
| Corner angle (flowing time) | s | ≥30 | 45.0 | T0345 |
| Sand equivalent | % | ≥60 | 66 | T0334 |
The miberal powder test result of table 1.8
| Test event | Unit | Technical standard | Test result | Method of testing |
| Apparent density | ≥2.50 | 2.732 | T0352 | |
| Water content | % | ≤1 | 0.5 | T0332 |
| Particle size range ＜ 0.6mm | % | 100 | 100 | T0351 |
| ＜ 0.15mm | % | 90-100 | 99.75 | T0351 |
| ＜ 0.075mm | % | 75-100 | 88.56 | T0351 |
| Hydrophilic coefficient | - | ≤1 | 0.71 | T0353 |
| Plasticity index | % | ≤4 | 2.8 | T0354 |
The performance indications of SK-90 pitches meet《Standard specification for construction and acceptance of highway asphalt pavement》It is relevant in (JTG F40-2004)
No. 90 associated specifications of pitch.The performance indications of coarse aggregate, fine aggregate and miberal powder meet《Highway engineering is gathered materials and tests rule
Journey》Associated specifications in (JTG E42-2005).
In the step 2, the preparation method of coal directly-liquefied residue modified pitch, it includes following according to sequencing
Step：
Step (1)：The coal directly-liquefied residue of Different adding amount is added in matrix pitch, coal directly-liquefied residue is prepared
Modified pitch；
Step (2)：Coal directly-liquefied residue is evaluated using needle penetration grading evaluation system and PG grading evaluation systems jointly
The performance of modified pitch, determines the optimum addition of coal directly-liquefied residue；
Step (3)：The coal directly-liquefied residue of optimum addition is added in matrix pitch, coal directly-liquefied residue is prepared
Modified pitch.
Choose the coal directly-liquefied residue that addition is 5%, 10%, 15%, 20% to be added separately in matrix pitch, mix
Close uniform, prepare four kinds of coal directly-liquefied residue modified pitch, test four kinds of technical indicators of modified pitch, it is ensured that its technology refers to
Mark meets《Standard specification for construction and acceptance of highway asphalt pavement》About the technical stipulation of pitch, result of the test table in (JTG F40-2004)
It is bright：With the increase of coal directly-liquefied residue addition, the PG high thermal levels of coal directly-liquefied residue modified pitch are continuously increased,
And PG low-temperature grades are gradually reduced.Compared with matrix pitch, when the addition of coal directly-liquefied residue is 10%, the direct liquid of coal
The high thermal level for changing residue modified pitch improves 2 grades, and PG low-temperature grades reduce by 1 grade；Work as coal directly-liquefied residue
Addition when being more than 10%, compared with matrix pitch, the PG low-temperature grades of coal directly-liquefied residue modified pitch decline 2 etc.
Level, and PG high-temperature behaviors improve 2 grades.Comprehensive indices, it is final determine coal directly-liquefied residue optimum addition be
10%, coal directly-liquefied residue modified pitch is prepared on this basis.
The heating-up temperature of the matrix pitch is 110 DEG C, and the heating-up temperature of the coal directly-liquefied residue is 170 DEG C；Institute
The mix temperature of matrix pitch and the coal directly-liquefied residue is stated for 150 DEG C, duration of mixing are 1h.
In the step 3, the preheating temperature of coal directly-liquefied residue modified pitch is 150 DEG C, preheating time is 2h；Collection
The preheating temperature of material is 155 DEG C, preheating time is 4h；The preheating temperature of miberal powder is 155 DEG C, preheating time is 4h.
In the step 4, according to the screening result of several mineral materials, with reference to existing《Asphalt highway construction technology
Specification》The requirement of AC-20 asphalts engineering grading limit, mineral aggregate group is carried out by spline fit method to it in (JTG F40-2004)
Into design, it is adjusted, the final formate gradation composition composition for determining mineral aggregate, as shown in table 1.9.
The AC-20 Mineral Aggregates of table 1.9 composition coordinates computational chart
According to the mineral aggregate gradation composition for determining, using five kinds of different amounts (3.5%, 4.0%, 4.5%, 5.0% and
5.5%) coal directly-liquefied residue modified pitch prepares marshal piece.Coal directly-liquefied residue modified pitch and mixing for gathering materials
Temperature is closed for 145 DEG C, duration of mixing are 60s；It is 60s for 145 DEG C, duration of mixing to add the mix temperature after miberal powder.Coal is direct
Liquefied residue modified asphalt mixture marshal piece positive and negative respectively hits real 75 times, and compaction test results are as shown in table 1.10.
The AC-20 type coal directly-liquefied residue modified asphalt mixture Marshall compaction test results of table 1.10
| The consumption (%) of coal directly-liquefied residue modified pitch | 3.5 | 4.0 | 4.5 | 5.0 | 5.5 | Technical requirements |
| 2.379 | 2.395 | 2.411 | 2.417 | 2.412 | - | |
| Voidage (%) | 7.1 | 5.8 | 4.4 | 3.4 | 2.8 | 3-5 |
| Saturation degree (%) | 48.2 | 57.7 | 67.8 | 75.6 | 80.4 | 65-75 |
| Void in mineral aggregate (%) | 13.8 | 13.7 | 13.5 | 13.8 | 14.4 | - |
| Stability (kN) | 8.63 | 9.38 | 11.42 | 10.52 | 9.44 | ≥8.0 |
| Flow valuve (0.1mm) | 25 | 31 | 33 | 35 | 39 | 20-40 |
Note：When voidage is 3,4,5, the minimum value of corresponding VMA is respectively 12,13,14, works as space
When rate is not integer, the VMA minimum values for determining to require by interpolation.
From table 1.10 and Fig. 2-7 as can be seen that the hair body of the coal directly-liquefied residue modified asphalt mixture of the present embodiment
The consumption a of corresponding DCL/Direct coal liquefaction modified pitch during product density maxima1=5.0%, corresponding coal during stability maximum
The consumption a of direct liquefaction residue modified pitch2=4.55%, corresponding coal directly-liquefied residue modified drip when voidage is 4%
Blue or green consumption a3=4.6%, the consumption a of corresponding coal directly-liquefied residue modified pitch during pitch saturation degree intermediate value4=4.6%,
Seek its average value OAC1=(a1+a2+a3+a4)/4=4.69%.
When asphalt content is in 4.4-4.95%, indices meet《Standard specification for construction and acceptance of highway asphalt pavement》(JTG
F40-2004 the Its Relevant Technology Standards in), now OACmin=4.4%, OACmax=4.95%, seek its average value OAC2=
(OACmin+OACmax)/2=4.68%.
Take OAC1And OAC2Average value as coal directly-liquefied residue modified pitch optimum amount OAC=(OAC1+
OAC2The ≈ of)/2 4.7%.
Learnt from Fig. 2-7 Marshall stability of coal directly-liquefied residue modified asphalt mixture, flow valuve, voidage,
Void in mineral aggregate and pitch saturation degree are satisfied by《Standard specification for construction and acceptance of highway asphalt pavement》Correlation in (JTG F40-2004)
Technical standard, the final optimum amount for determining coal directly-liquefied residue modified pitch is 4.7%.
In the step 6, its compound is prepared according to the optimum amount of the coal directly-liquefied residue modified pitch for determining,
The coal directly-liquefied residue modified pitch of optimum amount and the mix temperature gathered materials are 145 DEG C, duration of mixing is 60s, add ore deposit
Mix temperature after powder is 145 DEG C, duration of mixing is 60s.The property indices of its marshal piece are as shown in table 1.11.
The AC-20 type coal directly-liquefied residue modified asphalt mixture Marshall Test results of table 1.11
Pavement performance to coal directly-liquefied residue modified asphalt mixture verifies, result of the test such as table 1.12-
Shown in 1.16.
(1) water stabilizing of coal directly-liquefied residue modified asphalt mixture
The coal directly-liquefied residue modified asphalt mixture immersion Marshall test result of table 1.12
The coal directly-liquefied residue modified asphalt mixture indirect tensile test on frozen-thaw result of table 1.13
(2) high temperature stability performance of coal directly-liquefied residue modified asphalt mixture
The coal directly-liquefied residue modified asphalt mixture wheel tracking test result of table 1.14
(3) crack resistance at low-temperature of coal directly-liquefied residue modified asphalt mixture
The coal directly-liquefied residue modified asphalt mixture low temperature bend test result of table 1.15
(4) permeability performance of coal directly-liquefied residue modified asphalt mixture
The coal directly-liquefied residue modified asphalt mixture infiltration test result of table 1.16
| Test specimen is numbered | The infiltration time (min) | Water percolating capacity (mL) | Infiltration coefficient (mL/min) |
| 1 | 3 | 0 | 0 |
| 2 | 3 | 0 | 0 |
| 3 | 3 | 0 | 0 |
| Average value | 3 | 0 | 0 |
To sum up, the performance of AC-20 types coal directly-liquefied residue modified asphalt mixture is satisfied by《Asphalt highway is constructed
Technical specification》Its Relevant Technology Standards in (JTG F40-2004), its mix-design is that the coarse aggregate of 16-26.5mm is
The coarse aggregate of 23%, 9.5-16mm is the coarse aggregate of 22%, 4.75-9.5mm for the coarse aggregate of 10%, 2.36-4.75mm is
The fine aggregate of 8%, 0-2.36mm is 28.3%, and miberal powder is 4%, and the optimum amount of coal directly-liquefied residue modified pitch is
4.7%.
The preparation method of the coal directly-liquefied residue modified asphalt mixture of the present embodiment, its mentality of designing is unique, technique
Simply, simple operation, parameter and condition in proportioning, each step of above-mentioned each constitutive material have synergy, by each group
The optimum combination of proportioning, each parameter and condition into raw material realizes the preparation of coal directly-liquefied residue modified asphalt mixture,
And its pavement performance is good, balanced, with important Social benefit and economic benefit.
Embodiment two：
According to another embodiment of coal directly-liquefied residue modified asphalt mixture of the invention, it contains and gathers materials and ore deposit
Powder, also containing coal directly-liquefied residue modified pitch, each constitutive material accounts for the coal directly-liquefied residue modified asphalt mixture
Percentage by weight be gather materials 95%, miberal powder 1.5%, coal directly-liquefied residue modified pitch 3.5%.It is described to gather materials including thick
Gather materials and fine aggregate, coarse aggregate is 2.5 with the quality proportioning of fine aggregate:1.
The preparation method of the coal directly-liquefied residue modified asphalt mixture of the present embodiment is identical with embodiment one, different
It is：In the step 2, when preparing coal directly-liquefied residue modified pitch, the heating-up temperature of the matrix pitch is 130 DEG C, institute
The heating-up temperature for stating coal directly-liquefied residue is 190 DEG C；The mix temperature of the matrix pitch and the coal directly-liquefied residue
For 160 DEG C, duration of mixing are 2h.In the step 3, the preheating temperature of coal directly-liquefied residue modified pitch is 160 DEG C, pre-
The hot time is 3h；The preheating temperature gathered materials is 185 DEG C, preheating time is 5h；The preheating temperature of miberal powder is 185 DEG C, preheating time
It is 5h.In the step 4, coal directly-liquefied residue modified pitch and the mix temperature gathered materials are 175 DEG C, duration of mixing is
90s；It is 90s for 175 DEG C, duration of mixing to add the mix temperature after miberal powder.In the step 6, the direct liquid of coal of optimum amount
Change residue modified pitch and the mix temperature gathered materials are 175 DEG C, duration of mixing is 90s, and it is 175 to add the mix temperature after miberal powder
DEG C, duration of mixing be 90s.The performance of the coal directly-liquefied residue modified asphalt mixture of the present embodiment is satisfied by《Highway asphalt
Pavement construction technical specification》Its Relevant Technology Standards in (JTG F40-2004), its mix-design is the rough set of 16-26.5mm
Expect be 25%, 9.5-16mm coarse aggregate for 23%, 4.75-9.5mm coarse aggregate for 12%, 2.36-4.75mm coarse aggregate
It is that the fine aggregate of 8%, 0-2.36mm is 27%, miberal powder is 1.5%, and the optimum amount of coal directly-liquefied residue modified pitch is
3.5%.
Embodiment three：
According to another embodiment of coal directly-liquefied residue modified asphalt mixture of the invention, it contains and gathers materials and ore deposit
Powder, also containing coal directly-liquefied residue modified pitch, each constitutive material accounts for the coal directly-liquefied residue modified asphalt mixture
Percentage by weight be gather materials 93%, miberal powder 2%, coal directly-liquefied residue modified pitch 5%.It is described to gather materials including coarse aggregate
And fine aggregate, coarse aggregate is 2.0 with the quality proportioning of fine aggregate:1.
The preparation method of the coal directly-liquefied residue modified asphalt mixture of the present embodiment is identical with embodiment one, different
It is：In the step 2, when preparing coal directly-liquefied residue modified pitch, the heating-up temperature of the matrix pitch is 120 DEG C, institute
The heating-up temperature for stating coal directly-liquefied residue is 180 DEG C；The mix temperature of the matrix pitch and the coal directly-liquefied residue
For 155 DEG C, duration of mixing are 1.5h.In the step 3, the preheating temperature of coal directly-liquefied residue modified pitch is 155 DEG C,
Preheating time is 2.5h；The preheating temperature gathered materials is 170 DEG C, preheating time is 4.5h；The preheating temperature of miberal powder is 170 DEG C, pre-
The hot time is 4.5h.In the step 4, coal directly-liquefied residue modified pitch is 160 DEG C, mix with the mix temperature gathered materials
Time is 75s；It is 75s for 160 DEG C, duration of mixing to add the mix temperature after miberal powder.In the step 6, the coal of optimum amount
Direct liquefaction residue modified pitch and the mix temperature gathered materials are 160 DEG C, duration of mixing is 75s, add the mix temperature after miberal powder
Spend for 160 DEG C, duration of mixing are 75s.The performance of the coal directly-liquefied residue modified asphalt mixture of the present embodiment is satisfied by《It is public
Road Asphalt Pavement Construction Technique specification》Its Relevant Technology Standards in (JTG F40-2004), its mix-design is 16-26.5mm
Coarse aggregate for the coarse aggregate of 24%, 9.5-16mm be the coarse aggregate of 20%, 4.75-9.5mm for 10%, 2.36-4.75mm
Coarse aggregate is that the fine aggregate of 8%, 0-2.36mm is 31%, and miberal powder is 2%, the optimum amount of coal directly-liquefied residue modified pitch
It is 5%.
It will be apparent to those skilled in the art that coal directly-liquefied residue modified asphalt mixture of the invention and its preparation side
Each several part shown by the content of the invention of method including the invention described above specification and specific embodiment part and accompanying drawing is appointed
Meaning combination, as space is limited and to make specification concise without each scheme that these combinations are constituted is described one by one.It is all in this hair
Within bright spirit and principle, any modification, equivalent substitution and improvements done etc. should be included in protection scope of the present invention
Within.
Claims (8)
1. a kind of coal directly-liquefied residue modified asphalt mixture, containing gathering materials and miberal powder, it is characterised in that：It is also direct containing coal
Liquefied residue modified pitch, the percentage by weight that each constitutive material accounts for the coal directly-liquefied residue modified asphalt mixture is,
Gather materials 91.3%, miberal powder 4%, coal directly-liquefied residue modified pitch 4.7%；It is described to gather materials including coarse aggregate and fine aggregate, coarse aggregate
It is 2.2 with the quality proportioning of fine aggregate:1, the wherein coarse aggregate of 16-26.5mm is that the coarse aggregate of 23%, 9.5-16mm is 22%,
The coarse aggregate of 4.75-9.5mm is 28.3% for the fine aggregate that the coarse aggregate of 10%, 2.36-4.75mm is 8%, 0-2.36mm；It is described
The preparation method of coal directly-liquefied residue modified asphalt mixture, comprises the following steps according to sequencing：
Step one：Test coal directly-liquefied residue, matrix pitch, the properties gathered materials with miberal powder；
Step 2：Prepare coal directly-liquefied residue modified pitch；
Step 3：By coal directly-liquefied residue modified pitch, gather materials is pre-processed with miberal powder；
Step 4：By the coal directly-liquefied residue modified pitch of different amounts and aggregate blending, miberal powder mix is added, prepare coal
Direct liquefaction residue modified asphalt mixture；
Step 5：The properties of coal directly-liquefied residue modified asphalt mixture are tested, and carries out overall merit, determine that coal is straight
Connect the optimum amount of liquefied residue modified pitch；
Step 6：By the coal directly-liquefied residue modified pitch of optimum amount and aggregate blending, miberal powder mix is added, prepare coal
Direct liquefaction residue modified asphalt mixture；
In the step 3, the preheating temperature of coal directly-liquefied residue modified pitch is 150 DEG C, preheating time is 2h, is gathered materials
Preheating temperature is 155 DEG C, preheating time is 4h, and the preheating temperature of miberal powder is 155 DEG C, preheating time is 4h；
In the step 5, corresponding coal is direct during the bulk density maximum of coal directly-liquefied residue modified asphalt mixture
The consumption a of liquefaction modified pitch1=5.0%, the consumption a of corresponding coal directly-liquefied residue modified pitch during stability maximum2=
4.55%, the consumption a of corresponding coal directly-liquefied residue modified pitch when voidage is 4%3=4.6%, during pitch saturation degree intermediate value
The consumption a of corresponding coal directly-liquefied residue modified pitch4=4.6%, seek its average value OAC1=（a1+a2+a3+a4）/4=4.69%；
When asphalt content is in 4.4-4.95%, indices meet JTG F40-2004《Standard specification for construction and acceptance of highway asphalt pavement》
In Its Relevant Technology Standards, now OACmin=4.4%, OACmax=4.95%, seek its average value OAC2=（OACmin+OACmax）/2=
4.68%；Take OAC1And OAC2Average value as coal directly-liquefied residue modified pitch optimum amount OAC=（OAC1+OAC2）/
2=4.7%；
In the step 6, the coal directly-liquefied residue modified pitch of optimum amount is 145 DEG C, mix with the mix temperature gathered materials
Time is 60s；It is 60s for 145 DEG C, duration of mixing to add the mix temperature after miberal powder.
2. coal directly-liquefied residue modified asphalt mixture as claimed in claim 1, it is characterised in that：The coarse aggregate includes
One or more in basalt, diabase and granite.
3. coal directly-liquefied residue modified asphalt mixture as claimed in claim 1, it is characterised in that：The fine aggregate includes
One or more in natural sand, Machine-made Sand and aggregate chips.
4. coal directly-liquefied residue modified asphalt mixture as claimed in claim 1, it is characterised in that：The miberal powder includes stone
One or more in ashes, calcium hydroxide and cement.
5. coal directly-liquefied residue modified asphalt mixture as claimed in claim 1, it is characterised in that：In the step 2,
The preparation method of coal directly-liquefied residue modified pitch, it is comprised the following steps according to sequencing,
Step（1）：The coal directly-liquefied residue of Different adding amount is added in matrix pitch, coal directly-liquefied residue is prepared and is modified
Pitch；
Step（2）：Coal directly-liquefied residue is evaluated jointly using needle penetration grading evaluation system and PG grading evaluations system to be modified
The performance of pitch, determines the optimum addition of coal directly-liquefied residue；
Step（3）：The coal directly-liquefied residue of optimum addition is added in matrix pitch, coal directly-liquefied residue is prepared and is modified
Pitch.
6. coal directly-liquefied residue modified asphalt mixture as claimed in claim 5, it is characterised in that：The DCL/Direct coal liquefaction
The optimum addition of residue is 10%.
7. coal directly-liquefied residue modified asphalt mixture as claimed in claim 5, it is characterised in that：The matrix pitch
Heating-up temperature is 110-130 DEG C, and the heating-up temperature of the coal directly-liquefied residue is 170-190 DEG C；The matrix pitch and institute
The mix temperature of coal directly-liquefied residue is stated for 150-160 DEG C, duration of mixing are 1-2h.
8. coal directly-liquefied residue modified asphalt mixture as claimed in claim 1, it is characterised in that：In the step 4,
Coal directly-liquefied residue modified pitch and the mix temperature gathered materials are 145-175 DEG C, duration of mixing is 60-90s；After adding miberal powder
Mix temperature for 145-175 DEG C, duration of mixing be 60-90s.
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| CN105884264A (en) * | 2016-04-14 | 2016-08-24 | 北京建筑大学 | High-modulus asphalt mixture and preparation method thereof |
| CN108083687A (en) * | 2017-12-04 | 2018-05-29 | 四川航天五源复合材料有限公司 | For the asphalt on road surface |
| CN107986724A (en) * | 2017-12-04 | 2018-05-04 | 四川航天五源复合材料有限公司 | A kind of asphalt for road surface |
| CN109650784A (en) * | 2019-01-28 | 2019-04-19 | 上海时申工贸有限公司 | A kind of asphalt and its production technology |
| CN113718592B (en) * | 2021-10-14 | 2022-11-29 | 北京建筑大学 | Preparation method of coal indirect liquefied residue asphalt mixture |
| CN114835414A (en) * | 2022-03-31 | 2022-08-02 | 中国神华煤制油化工有限公司 | Portland cement clinker and preparation method thereof |
| CN117049820B (en) * | 2023-10-12 | 2023-12-22 | 北京建筑大学 | Asphalt sand mixture of residue of direct coal liquefaction and preparation method thereof |
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