CN106007485B - A kind of stress absorbing layer anticracking material and preparation method thereof for mixing coal gasification fine slag - Google Patents
A kind of stress absorbing layer anticracking material and preparation method thereof for mixing coal gasification fine slag Download PDFInfo
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- CN106007485B CN106007485B CN201610329104.6A CN201610329104A CN106007485B CN 106007485 B CN106007485 B CN 106007485B CN 201610329104 A CN201610329104 A CN 201610329104A CN 106007485 B CN106007485 B CN 106007485B
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- coal gasification
- fine slag
- gasification fine
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- mixing
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Classifications
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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
- C04B26/00—Compositions of mortars, concrete or artificial stone, containing only organic binders, e.g. polymer or resin concrete
- C04B26/02—Macromolecular compounds
- C04B26/26—Bituminous materials, e.g. tar, pitch
-
- 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
- C04B2111/34—Non-shrinking or non-cracking materials
- C04B2111/343—Crack resistant materials
Abstract
The invention belongs to asphalt pavement material preparation fields, specifically disclose a kind of stress absorbing layer anticracking material for mixing coal gasification fine slag, include the material of following weight：20~30 parts of coal gasification fine slag, 15~20 parts of 0~3mm aggregate chips, 45~50 parts of 3~5mm rubbles, 10~15 parts of SBS modified pitch, 0~0.2 part of brucite mineral fibres.And preparation method thereof, include the following steps：It is spare respectively by 0~3mm aggregate chips, 3~5mm rubbles, coal gasification fine slag and SBS modified pitch heated at constant temperature；0~3mm aggregate chips, 3~5mm rubbles and the coal gasification fine slag after heated at constant temperature are placed in asphalt agitated kettle again, dry mixing 15s, then be added brucite mineral fibres, dry mixing 5s, add heating after SBS modified pitch, wet-mixing 90s to get.The present invention turns waste into wealth, and coal gasification fine slag is utilized in environmental protection, is the successful model of Green Development.
Description
Technical field
The present invention relates to asphalt pavement material preparation field, more particularly to a kind of stress absorbing layer for mixing coal gasification fine slag is anti-
Material and preparation method thereof is split, between cement concrete pavement and asphaltum concrete cover-layer.
Background technology
It is always a grand duke of bituminous paving no matter to create bituminous paving or old road resurfacing asphalt surface course, reflection crack
The big technical barrier that evil and durability of asphalt pavement research institute face.The formation of reflection crack, destroys pavement structure
Globality has seriously affected the durability, road-ability and beauty on road surface.
The generation of reflection crack in order to prevent, late nineteen nineties in last century, Minn. transportation department is in old cement
Low modulus modification pitch stress absorbing layer is set between concrete road surface and asphaltum concrete cover-layer, and stress absorbing layer has good answer
Power dissipates and the functions such as reduction stress concentration, inhibits the formation of Reflective Crack in Asphalt Overlays, with obvious effects.
Then, at home, Chang An University, Hubei Province's transportation chamber start to introduce the technology, and have developed and answer accordingly
Power absorbed layer special multi-modified asphalt saves highway Deteriorated concrete pavement pitch in Hubei, Shandong, Henan, Shaanxi, Guangxi etc. and adds
It is applied, is observed by field performance nearly ten years, asphalt surface course does not go out in paving engineering, newly-built bituminous coat project
Existing reflection crack has shown the preferable effect of prestressed of stress absorbing layer, but there are costs mostly excessively high, modified feedstock relies on into
The shortcomings of mouth, constructional difficulties, therefore, further deep development stress absorption layer material and popularization stress absorbing layer technology, have weight
The realistic meaning and economic value wanted.
Invention content
For problems of the prior art, the purpose of the present invention is to provide a kind of high viscoelastics, low modulus, antifatigue
The stress absorbing layer anticracking material for mixing coal gasification fine slag of cracking, between cement concrete pavement and asphaltum concrete cover-layer.
It is another object of the present invention to provide the preparation works of the stress absorbing layer anticracking material for mixing coal gasification fine slag
Skill, the preparation method flow is simple, realizes the waste utilization of cinder, economic and environment-friendly, has important practical significance and engineering
Practical value.
In order to achieve the above object, the present invention is achieved by the following scheme.
(1) a kind of stress absorbing layer anticracking material for mixing coal gasification fine slag, which is characterized in that match including following parts by weight
The material of ratio：
20~30 parts of nominal particle diameters of coal gasification fine slag are 15~20 parts of 0~3mm aggregate chips
Nominal particle diameter is 45~50 parts of 3~5mm rubbles, 10~15 parts of SBS modified pitch
0~0.2 part of brucite mineral fibres.
Further, the density of the coal gasification fine slag is 1.782g/cm3, including three categories tissue phase：Lamellar graphite
Phase-carbon black, porosity and looseness tissue phase-calcium aluminosilicate, inertia spherical silicon dioxide, chemical element include：C,Si,O,Ca,AL,
Fe、Mg、Ti。
Further, the nominal particle diameter is 0~3mm aggregate chips and 3~5mm rubbles are limestone, diabase or basalt.
Further, the SBS modified pitch meets《Standard specification for construction and acceptance of highway asphalt pavement JTG F40-2004》It is poly-
The technology requirement of polymer modified pitch, belongs to《Standard specification for construction and acceptance of highway asphalt pavement JTG F40-2004》In listed SBS change
Property pitch I-B or I-C series.
Further, the average length of the brucite mineral fibres is 1.0~3.5mm, and average diameter is 3.0~8.0 μ
M, tensile strength are 892.4~1283.7Mpa, and dehydration temperaturre is 400~500 DEG C.
(2) preparation method of the stress absorbing layer anticracking material of coal gasification fine slag is mixed, which is characterized in that including following step
Suddenly：
Step 1, coal gasification fine slag, 0~3mm aggregate chips, 3~5mm rubbles, SBS are weighed respectively according to above-mentioned weight
Modified pitch and brucite mineral fibres；
Step 2, by 0~3mm aggregate chips, 3~5mm rubbles under the conditions of 180~190 DEG C heated at constant temperature 4 hours or more,
It is spare；
Step 3, by the coal gasification fine slag at a temperature of 150~160 DEG C, heated at constant temperature 2h or more is spare；
Step 4, the SBS modified pitch is heated to 170~180 DEG C, and stirred, it is spare；
Step 5,0~3mm aggregate chips, 3~5mm rubbles and the coal gasification fine slag after heated at constant temperature asphalt is placed in stir
It mixes in pot, dry mixing 15s, brucite mineral fibres is then added, dry mixing 5s adds the SBS modified pitch after heating, wet-mixing
90s to get.
Compared with prior art, beneficial effects of the present invention are：
The present invention turns waste into wealth, and coal gasification fine slag is utilized in environmental protection, and utilizes the lamellar graphite phase-in coal gasification fine slag
Carbon black, porosity and looseness tissue phase-calcium aluminosilicate and inertia spherical silicon dioxide three categories tissue phase and fine shepardite are fine
The structural behaviour of dimension is prepared for a kind of high viscoelastic, low modulus, the stress absorbing layer cracking resistance for mixing coal gasification fine slag of antifatigue cracking
Material, preparation method flow is simple, economic and environment-friendly, has important practical significance and engineering practical value.
Description of the drawings
The present invention is described in further details in the following with reference to the drawings and specific embodiments.
Fig. 1 is the scanning electron microscope (SEM) photograph of coal gasification fine slag in the stress absorbing layer anticracking material of the invention for mixing coal gasification fine slag.
Fig. 2 is the low-temperature bending creep test figure of the stress absorbing layer anticracking material for mixing coal gasification fine slag of embodiment 5；
Fig. 3 is the manual bending Test Drawing of the stress absorbing layer anticracking material for mixing coal gasification fine slag of embodiment 5.
Specific implementation mode
Embodiment of the present invention is described in detail below in conjunction with specific embodiment.
A kind of stress absorbing layer anticracking material for mixing coal gasification fine slag of the present invention, which is characterized in that including following weight
The material of part proportioning：
20~30 parts of nominal particle diameters of coal gasification fine slag are 15~20 parts of 0~3mm aggregate chips
Nominal particle diameter is 45~50 parts of 3~5mm rubbles, 10~15 parts of SBS modified pitch
0~0.2 part of brucite mineral fibres.
Coal gasification fine slag in the present invention comes from air-flow bed coal-gasification device, is black powder mixture, and density is
1.782g/cm3, screening result is shown in Table 1, includes mainly three categories tissue phase：Lamellar graphite phase-carbon black, porosity and looseness tissue phase-
Calcium aluminosilicate, inertia spherical silicon dioxide, chemical element include：C, Si, O, Ca, AL, Fe, Mg, Ti, except C is with carbon black (stone
Ink) in the presence of outside, other elements exist form in the form of the oxide, characterize stereoscan photograph such as Fig. 1 of its microscopic appearance
It is shown.
The screening result of 1 coal gasification fine slag of table
| Screen size/mm | 0.6 | 0.3 | 0.15 | 0.075 |
| Pass through quality percentage/% of each sieve | 100.0 | 98.5 | 78.4 | 44.6 |
Gathering materials for the common building stones of asphalt highway in the present invention, two grades of specifications of 0~3mm and 3~5mm are selected,
Material is diabase.
The fiber obtained in shepardite Minerals And Rocks of the brucite mineral fibres from fibrous structure in the present invention,
Average length is 1.0~3.5mm, and average diameter is 3.0~8.0 μm, and tensile strength is 892.4~1283.7Mpa, dehydration temperaturre
It it is 400~500 DEG C, the essential element group of the fiber becomes：The elements such as Mg, Si, Al, H, O, Fe form.
SBS modified pitch in the present invention meets《Standard specification for construction and acceptance of highway asphalt pavement JTG F40-2004》Polymer
The technology requirement of modified pitch, belongs to《Standard specification for construction and acceptance of highway asphalt pavement JTG F40-2004》In listed SBS be modified drip
Green I-B or I-C series.
Embodiment 1
The preparation for mixing the stress absorbing layer anticracking material of coal gasification fine slag, includes the following steps：
Step 1,20 parts of coal gasification fine slags, 20 parts of 0~3mm aggregate chips, 50 parts of 3~5mm rubbles, 10 parts of SBS are weighed and are modified drip
It is green；
Step 2, by 0~3mm aggregate chips, 3~5mm rubbles under the conditions of 180~190 DEG C heated at constant temperature 4h, it is spare；
Step 3, by the coal gasification fine slag at a temperature of 150~160 DEG C, heated at constant temperature 3h is spare；
Step 4, the SBS modified pitch is heated to 170~180 DEG C, and stirred, it is spare；
Step 5,0~3mm aggregate chips, 3~5mm rubbles and the coal gasification fine slag after heated at constant temperature asphalt is placed in stir
Mix in pot, dry mixing 15s, be added heating after SBS modified pitch, wet-mixing 90s to get.
Embodiment 2
The preparation for mixing the stress absorbing layer anticracking material of coal gasification fine slag, includes the following steps：
Step 1,23 parts of coal gasification fine slags, 18 parts of 0~3mm aggregate chips, 48 parts of 3~5mm rubbles, 10.8 parts of SBS are weighed to be modified
Pitch, 0.2 part of brucite mineral fibres；
Step 2, by 0~3mm aggregate chips, 3~5mm rubbles under the conditions of 180~190 DEG C heated at constant temperature 4h, it is spare；
Step 3, by the coal gasification fine slag at a temperature of 150~160 DEG C, heated at constant temperature 2h is spare；
Step 4, the SBS modified pitch is heated to 170~180 DEG C, and stirred, it is spare；
Step 5,0~3mm aggregate chips, 3~5mm rubbles and the coal gasification fine slag after heated at constant temperature asphalt is placed in stir
It mixes in pot, dry mixing 15s, brucite mineral fibres is then added, dry mixing 5s adds the SBS modified pitch after heating, wet-mixing
90s to get.
Embodiment 3
The preparation for mixing the stress absorbing layer anticracking material of coal gasification fine slag, includes the following steps：
Step 1,26 parts of coal gasification fine slags, 16 parts of 0~3mm aggregate chips, 46 parts of 3~5mm rubbles, 11.8 parts of SBS are weighed to be modified
Pitch, 0.2 part of brucite mineral fibres；
Step 2, by 0~3mm aggregate chips, 3~5mm rubbles under the conditions of 180~190 DEG C heated at constant temperature 4h, it is spare；
Step 3, by the coal gasification fine slag at a temperature of 150~160 DEG C, heated at constant temperature 2h is spare；
Step 4, the SBS modified pitch is heated to 170~180 DEG C, and stirred, it is spare；
Step 5,0~3mm aggregate chips, 3~5mm rubbles and the coal gasification fine slag after heated at constant temperature asphalt is placed in stir
It mixes in pot, dry mixing 15s, brucite mineral fibres is then added, dry mixing 5s adds the SBS modified pitch after heating, wet-mixing
90s to get.
Embodiment 4
The preparation for mixing the stress absorbing layer anticracking material of coal gasification fine slag, includes the following steps：
Step 1,28 parts of coal gasification fine slags, 14 parts of 0~3mm aggregate chips, 45 parts of 3~5mm rubbles, 12.8 parts of SBS are weighed to be modified
Pitch, 0.2 part of brucite mineral fibres；
Step 2, by 0~3mm aggregate chips, 3~5mm rubbles under the conditions of 180~190 DEG C heated at constant temperature 4h, it is spare；
Step 3, by the coal gasification fine slag at a temperature of 150~160 DEG C, heated at constant temperature 3h is spare；
Step 4, the SBS modified pitch is heated to 170~180 DEG C, and stirred, it is spare；
Step 5,0~3mm aggregate chips, 3~5mm rubbles and the coal gasification fine slag after heated at constant temperature asphalt is placed in stir
It mixes in pot, dry mixing 15s, brucite mineral fibres is then added, dry mixing 5s adds the SBS modified pitch after heating, wet-mixing
90s to get.
Embodiment 5
The preparation for mixing the stress absorbing layer anticracking material of coal gasification fine slag, includes the following steps：
Step 1,30 parts of coal gasification fine slags, 12 parts of 0~3mm aggregate chips, 43 parts of 3~5mm rubbles, 14.8 parts of SBS are weighed to be modified
Pitch, 0.2 part of brucite mineral fibres；
Step 2, by 0~3mm aggregate chips, 3~5mm rubbles under the conditions of 180~190 DEG C heated at constant temperature 4h, it is spare；
Step 3, by the coal gasification fine slag at a temperature of 150~160 DEG C, heated at constant temperature 2h is spare；
Step 4, the SBS modified pitch is heated to 170~180 DEG C, and stirred, it is spare；
Step 5,0~3mm aggregate chips, 3~5mm rubbles and the coal gasification fine slag after heated at constant temperature asphalt is placed in stir
It mixes in pot, dry mixing 15s, brucite mineral fibres is then added, dry mixing 5s adds the SBS modified pitch after heating, wet-mixing
90s to get.
It is sampled from the stress absorbing layer anticracking material for mixing coal gasification fine slag made from above-described embodiment, carries out following examination
Part molded test：
1. through marshall compaction instrument Beat numbers, the stress absorbing layer anticracking material Marshall examination for mixing coal gasification fine slag is completed
The preparation of part, the volume parameter for testing test specimen；
2. taking compression rebound modulu die trialStatic pressure method is moldedExamination
Part, the compression rebound modulu for testing test specimen；
3. using track rolling instrument, roller-compaction is mixed the stress absorbing layer anticracking material track plate of coal gasification fine slag, is used for
Test the high-temperature stability, low-temperature cracking-resistance, fatigue behaviour of test specimen.
The test specimen of above-mentioned preparation is tested, acquired results are as shown in table 2.
The performance test results of the material of the different embodiments of table 2
Note：*1Compression rebound modulu test temperature is 15 DEG C, *2Low temperature is curved, and to pull open bad strain-gauge test temperature be -10 DEG C, *3Control
Strain fatigue test temperature processed is 20 DEG C, *4Minn. stress absorbing layer mixture.
As shown in Table 2, the stress absorbing layer anticracking material of above-mentioned 5 embodiments is presented low modulus, large deformation, antifatigue opens
The characteristic split.When coal gasification fine slag volume increases to 30% from 20%, compression rebound modulu is down to 380Mpa from 624MPa, and low temperature is curved
Failure strain and controlled strain fatigue rupture number is drawn to increase separately 66.4%, 247.0%；As it can be seen that with coal gasification fine slag
The increase of volume, the fatigue behaviour for mixing coal gasification fine slag stress absorbing layer anticracking material dramatically increase.
In addition, it is every with Minn. stress absorbing layer mixture to mix coal gasification fine slag stress absorbing layer mixture
Performance compares, and embodiment 3 mixes coal gasification fine slag stress absorbing layer mixture in high-temperature stability, compression rebound modulu, low
Warm cracking resistance, in terms of fatigue behaviour with the properties of Minn. stress absorbing layer mixture substantially close to.
In addition, as seen from Figure 2, the stress absorbing layer anticracking material for mixing coal gasification fine slag of the invention has excellent low
The curved drawing fatigue properties of temperature, from the figure 3, it may be seen that the stress absorbing layer anticracking material for mixing coal gasification fine slag of the present invention has the curved of brilliance
Bent flexibility.
This is primarily due to：1. the adsorptivity of the lamellar graphite phase-carbon black and pitch in coal gasification fine slag is fabulous, can enhance
Adhesiveness between mineral aggregate and pitch, meanwhile, the layer structure of graphite-phase-carbon black is conducive to migration, lubrication between aggregate particle, has
Conducive to the large deformation of stress absorption layer material, dissipation crack tip stress concentration；2. the porosity and looseness tissue in coal gasification fine slag
Phase-calcium aluminosilicate has an extra specific surface area, and pitch component, high polymer component penetrate into wherein in succession, be built into component mutually permeate,
The space net structure of high viscoelastic, is conducive to the elasticity for enhancing stress absorption layer material and elasticity is restored, and improves stress absorption
The antifatigue cracking performance of layer material；3. the inertia spherical silicon dioxide in coal gasification fine slag is conducive to stress absorption layer material
Viscoelastic deformation, alleviation and dissipation stress；4. fine brucite fiber is in the stress absorbing layer anticracking material for mixing coal gasification fine slag
In, it fibre matting or extend into porosity and looseness coal gasification fine slag, plays the role of good " bridge joint reinforcement ", further improve
The anti-fatigue performance of stress absorbing layer anticracking material.
Although the present invention is described in detail with a general description of the specific embodiments in this specification,
But on the basis of the present invention, it can be made some modifications or improvements, this will be apparent to those skilled in the art.
Therefore, these modifications or improvements without departing from theon the basis of the spirit of the present invention, belong to claimed model
It encloses.
Claims (1)
1. mixing the preparation method of the stress absorbing layer anticracking material of coal gasification fine slag, it to be used for cement concrete pavement and asphalt overlay
Between layer, which is characterized in that include the following steps：
Step 1,20~30 parts of coal gasification fine slag is weighed respectively according to following weight, nominal particle diameter is 0~3mm aggregate chips 15
~20 parts, nominal particle diameter be 0.2 part of 45~50 parts of 3~5mm rubbles, 10~15 parts of SBS modified pitch and brucite mineral fibres；
Wherein, the density of the coal gasification fine slag is 1.782g/cm3, including three categories tissue phase：It is lamellar graphite phase-carbon black, more
Hole open texture phase-calcium aluminosilicate, inertia spherical silicon dioxide, chemical element include：C,Si,O,Ca,AL,Fe,Mg,Ti；
The average length of the brucite mineral fibres is 1.0~3.5mm, and average diameter is 3.0~8.0 μm, and tensile strength is
892.4~1283.7MP a, dehydration temperaturre are 400~500 DEG C；
Step 2, by 0~3mm aggregate chips, 3~5mm rubbles under the conditions of 180~190 DEG C heated at constant temperature at least 4h, it is spare；
Step 3, by the coal gasification fine slag at a temperature of 150~160 DEG C, heated at constant temperature at least 2h is spare；
Step 4, the SBS modified pitch is heated to 170~180 DEG C, and stirred, it is spare；
Step 5,0~3mm aggregate chips, 3~5mm rubbles and the coal gasification fine slag after heated at constant temperature are placed in asphalt agitated kettle
In, dry mixing 15s, then be added brucite mineral fibres, dry mixing 5s, add heating after SBS modified pitch, wet-mixing 90s, i.e.,
?.
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| CN107857274A (en) * | 2017-03-15 | 2018-03-30 | 吉林大学 | The synthetic method and tobermorite fibrous material of tobermorite fibrous material |
| CN108484000A (en) * | 2018-03-22 | 2018-09-04 | 长安大学 | A kind of conductivity type asphalt, preparation method and its from snow-melting system |
| CN108817030A (en) * | 2018-05-31 | 2018-11-16 | 内蒙古大学 | A kind of method that coal gasification fine slag is activated |
| CN112430008A (en) * | 2020-11-19 | 2021-03-02 | 内蒙古综合交通科学研究院有限责任公司 | Steel slag stress absorbing layer material and preparation method thereof |
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