CN100417614C - Modified mineral aggregate for bituminous pavement and method for producing same - Google Patents
Modified mineral aggregate for bituminous pavement and method for producing same Download PDFInfo
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- CN100417614C CN100417614C CNB2006100168084A CN200610016808A CN100417614C CN 100417614 C CN100417614 C CN 100417614C CN B2006100168084 A CNB2006100168084 A CN B2006100168084A CN 200610016808 A CN200610016808 A CN 200610016808A CN 100417614 C CN100417614 C CN 100417614C
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- mineral aggregate
- asphalt
- coupling agent
- filler
- surface modification
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Abstract
The present invention provides a modified mineral aggregate for asphalt pavement and a production method thereof. The method comprises the following steps: adding 0.5 to 5kg of coupling agent in the aggregate per 1000kg after the mineral aggregate is heated up in a hot roller; putting the mixed aggregate in a stirring jar and uniformly stirring for 10 to 25 minutes. In this way, the surface modification of the aggregate is finished. The combination property of asphalt mixture can be improved greatly by using the coupling agent to carry out the surface modification for the mineral aggregate which comprises aggregate and fillers, wherein the mineral aggregate is the major component material of the asphalt mixture. The mode between the surfaces of the mineral aggregate and the asphalt is converted into cementation from adhesion, so the cementation power and the stability between the mineral aggregate and the asphalt are enhanced greatly. The invention enhances the affinity of the mineral aggregate and the asphalt, and particularly the fillers can uniformly dispersed in the asphalt, so the filler level of the fillers can be increased. The combination property of the asphalt mixture can be improved, and the problem of cementation of asphalt material with different characters and the mineral aggregate is solved. In addition, the durability, the stability and the durability of the asphalt pavement are enhanced, and the present invention can solve the harm to the asphalt pavement, such as early damage, rutting, etc.
Description
Technical field
The modified mineral aggregate that the open bituminous pavement of the present invention is used also provides its production method simultaneously, belongs to highway engineering, town road technical field.
Technical background
China Higher level highway and town road construction development at present is rapid, and wherein bituminous pavement is the primary structure form, is perplexing Road construction person at the operation initial stage with regard to the problems such as early stage damage that take place in various degree always, becomes the technical barrier that needs to be resolved hurrily.The road worker has carried out a large amount of research from different perspectives for this reason, but most lays particular emphasis on the grating (as SMA) of improving asphalt, improves pitch use properties (as modifying asphalt) or improve mineral aggregate the technical feature that improves compound with technological methods such as bituminous adhesivity (add antistripping agent, mix slaked lime), raising Engineering Quality Control indexs.As: by modified asphalt technology, improve the high temperature performance of asphaltic binder, improved the pavement performance of modified asphalt mixture.But,, make modifying asphalt improve limited with the adhesivity of mineral aggregate with belonging to adhesive attraction between mineral aggregate because it belongs to physically modified.Its contribution to the asphalt pavement performance mainly is that the performance that improves modifying asphalt itself realizes.Therefore can not fundamentally solve the disease problem of bituminous pavement.There is the cost height simultaneously, easily emanates shortcomings such as difficulty of construction increase.Also can adjust the asphalt mineral aggregate gradation: as framework compact type grating, SMA grating, though improved the technical feature of compound to a certain extent, but thoroughly do not solve the disease problem on road surface, increased the Construction control difficulty simultaneously, improved construction costs (as SMA).Especially modifying asphalt, SMA technology have all improved the cost of bituminous pavement significantly.Its popularization is restricted.
As the composition material mineral aggregate of bituminous pavement (gather materials, filler), in present engineering construction, also just technical requirements has been proposed in aspects such as its complete processing and particle shape, composition, intensity.Because mineral aggregate has hydrophilic, lipophobic surface property, causes mineral aggregate and bituminous poor adhesion, under heavy duty and high speed traveling effect, make bituminous pavement produce diseases such as early water damage and rut.
Summary of the invention
The present invention discloses the modified mineral aggregate that a kind of bituminous pavement is used, and has solved different properties material pitch with the adhesion problem between mineral aggregate, has improved intensity, stability and the weather resistance of bituminous pavement.
The present invention also provides the production method of the modified mineral aggregate that bituminous pavement uses, and changes the main raw that is used for asphalt---and hydrophilic, the lipophobic surface property of mineral aggregate (comprise gather materials, filler) reaches mineral aggregate surface hydrophobic, lipophilic purpose.
Technical scheme of the present invention is as follows:
In the asphalt production process on demand respectively to gather materials, filler (or reclaim powder) carries out surface modification, adds pitch then and mixes and stirs, and finishes the compound production process, may further comprise the steps:
1. the modification of gathering materials: carry out surface modification in the asphalt production process to gathering materials, that is: gather materials after the heating of compound amalgamator heating drum, putting into compound mixes cylinder and puts into compound and mix the normal dry mixing down of 175～200 ℃ in cylinder, gather materials by every 1000kg and to add the coupling agent of 0.5～5kg, evenly stirring 10～25s finishes the surface modification to gathering materials, and adds pitch subsequently and normally mixes and stirs the production asphalt;
2. filler modified: as in the filler production process,, to finish surface modification to filler by the coupling agent of every 1000kg filler adding 3～20kg.
3. reclaim the dust modification: compound is mixed and stirred the recovery dust that produces in the process, reclaim the coupling agent that dust adds 2～15kg, finish to reclaiming the surface modification of dust by every 1000kg.
Its surface-modifying agent of modified product of the present invention should be wrapped up in attached even, and high temperature resistant (decomposition temperature is not less than 210 ℃), the surface property oleophyllie hydrophobic of mineral aggregate strengthens the cohesive force between mineral aggregate and the pitch.
Use the asphalt technical indicator of modified mineral aggregate as follows:
Marshall stability index: stability 〉=8kN, flow valuve 1.5-4.5mm.(Marshall stability test) immersion Marshall Test residual stability is not less than 85%; The retained strength ratio of freeze thawing split test is not less than 80%.
High temperature stability performance: dynamic stability 〉=1000 time/mm (60 ℃ of wheel tracking tests)
Low-temperature performance: flexural failure strain 〉=2300 μ ε (10 ℃ of pliability tests)
The coupling agent that the present invention relates to is that titanate ester, aluminium esters of gallic acid, silicane, zircoaluminate and organic complex etc. are several, specifically selects one or more mixing in the following coupling agent for use:
1, titanate coupling agent:
General formula (RO)
M-Ti-(OX-R '-Y)
N
Wherein: 1≤M≤4, M+N≤6; R-short carbon chain alkyl; R '-length carbochain alkyl; Elements such as X-C, N, P, S; Groups such as Y-hydroxyl, amino, two keys.
Type: monoalkoxy type, chelating type, corrdination type
Consumption: 0.05%～2% of mineral aggregate quality.
2, aluminate coupling agent:
General formula
Wherein: the group of the active proton of RO or functional group's effect; The Dn-coordinating group.
Consumption: 0.05%～1.3% of mineral aggregate quality.
3, silane coupling agent:
General formula R SiX
3
Wherein: R-polymer molecule active function groups; X-can hydrolysis alkoxyl group.
Type: aminosilane, epoxy radicals silicone hydride, sulfenyl silane, methacryloxy silane, vinyl silanes, urea groups silane, isocyanato silanes.
Consumption: 0.05～1.4% of mineral aggregate quality
Use the asphalt technical indicator of modified mineral aggregate as follows:
Marshall stability index: stability 〉=8kN, flow valuve 1.5-4.5mm.(Marshall stability test)
Immersion Marshall Test residual stability is not less than 85%; The retained strength ratio of freeze thawing split test is not less than 80%.
High temperature stability performance: dynamic stability 〉=1000 time/mm (60 ℃ of wheel tracking tests)
Low-temperature performance: flexural failure strain 〉=2300 μ ε (10 ℃ of pliability tests)
The coupling agent that the present invention relates to is that titanate ester, aluminium esters of gallic acid, silicane, zircoaluminate and organic complex etc. are several, specifically selects one or more mixing in the following coupling agent for use:
1, titanate coupling agent:
General formula (RO)
M-Ti-(OX-R '-Y)
N
Wherein: 1≤M≤4, M+N≤6; R-short carbon chain alkyl; R '-length carbochain alkyl; Elements such as X-C, N, P, S; Groups such as Y-hydroxyl, amino, two keys.
Type: monoalkoxy type, chelating type, corrdination type
Consumption: 0.05%～2% of mineral aggregate quality.
2, aluminate coupling agent:
General formula
Wherein: the group of the active proton of RO or functional group's effect; The Dn-coordinating group.
Consumption: 0.05%～1.3% of mineral aggregate quality.
3, silane coupling agent:
General formula R SiX
3
Wherein: R-polymer molecule active function groups; X-can hydrolysis alkoxyl group.
Type: aminosilane, epoxy radicals silicone hydride, sulfenyl silane, methacryloxy silane, vinyl silanes, urea groups silane, isocyanato silanes.
Consumption: 0.05～1.4% of mineral aggregate quality
PH value of water solution: 3～5.
4, zircoaluminate coupling agent: CAVEDON.
5, organic chromium coupling agent.
The requirement of properties-correcting agent
Properties-correcting agent should be able to be wrapped up in equably and be attached to the mineral aggregate surface, and high temperature resistant (decomposition temperature is not less than 210 ℃), the surface property that changes mineral aggregate reaches oleophyllie hydrophobic, strengthens the cohesive force between mineral aggregate and the pitch, improves the over-all properties of asphalt.
Coupling agent is the chemical substance with both sexes structure.It is several to be divided into titanate ester, aluminium esters of gallic acid, silicane, zircoaluminate and organic complex etc. by its chemical structure and composition.A part of group in its full molecule can with the various functional group reactionses on mineral aggregate surface, form strong chemical bonding, another part group can twine with pitch chemical reaction or physics, thereby with two kinds of firm combining of material that nature difference is very big, make inorganic mineral aggregate with organically setting up " molecule bridge " between the pitch with specific function, make between two kinds of material surfaces to become bonding, greatly improved cohesive force and stability between mineral aggregate and the pitch by adhesion.
Beneficial effect of the present invention is: use surface-modifying agent--coupling agent carries out surface modification to the main composition material mineral aggregate of asphalt (gather materials, filler), before asphalt mixes and stirs, gathering materials of having heated carried out modification, filler carries out modification before mixing and stirring after processing, mineral aggregate after the use modification is produced asphalt, will greatly improve the over-all properties of asphalt.Make between two kinds of material surfaces of mineral aggregate and pitch to become bonding, greatly improve cohesive force and stability between mineral aggregate and the pitch by adhesion.Strengthen mineral aggregate and bituminous affinity, especially made filler homodisperse in pitch, can increase the loading level of filler.Can improve the over-all properties of asphalt.Be expected to fundamentally solve the disease such as early stage damage, rut of bituminous pavement.
Under the constant situation of asphalt mixture volume index, can reduce the quantity of asphaltic binder relatively.Reduce construction costs.Compare with the plain asphalt compound, the expense of every m3 asphalt can be saved 40～80 yuan.
Embodiment
By following examples the present invention is described for example further, and do not limit the present invention in any way, under the prerequisite that does not deviate from technical solution of the present invention, any change or change that those of ordinary skills that the present invention did are realized easily all will fall within the claim scope of the present invention.
The main composition material mineral aggregate of asphalt comprises and gathering materials, filler, recovery dust.In the asphalt production process, carry out surface modification on demand respectively, add pitch then and mix and stir, finish the compound production process.
Embodiment 1
Coupling agent is a titanate coupling agent: bisoxyacetate ti tanate, JN-115
1. the modification of gathering materials: carry out surface modification in the asphalt production process to gathering materials, that is: gather materials after the heating of compound amalgamator heating drum, put into compound and mix cylinder, when normal dry mixing, gather materials and add the titanate coupling agent of 1.0kg by every 1000kg, evenly stirring 10～25s finishes the surface modification to gathering materials, and adds modified filler, pitch subsequently and normally mixes and stirs the production asphalt;
2. filler modified: the modification to filler can be used the powder surface modification machine in the filler production process or before using, and by the titanate coupling agent of every 1000kg filler adding 5kg, finishes the surface modification to filler.
3. reclaim the dust modification: compound is mixed and stirred the recovery dust that produces in the process, use the powder surface modification machine, reclaim the titanate coupling agent that the dust quality adds 4kg, finish to reclaiming the surface modification of dust by every 1000kg.
The mineral aggregate surface-modifying agent should be wrapped up in attached even, and high temperature resistant (decomposition temperature is not less than 210 ℃), the surface property oleophyllie hydrophobic of mineral aggregate strengthens the cohesive force between mineral aggregate and the pitch.
Use the asphalt technical indicator of modified mineral aggregate as follows:
Marshall stability index: Marshall stability 10.88kN, flow valuve 3.2mm.
Immersion Marshall Test residual stability, 92%; The retained strength ratio of freeze thawing split test, 89%.
High temperature stability performance: dynamic stability=1580 time/mm (60 ℃ of wheel tracking tests)
Low-temperature performance: flexural failure strain=2410 μ ε (10 ℃ of pliability tests)
Embodiment 2
Coupling agent is aluminate coupling agent: DL-441-A
1. the modification of gathering materials: carry out surface modification in the asphalt production process to gathering materials, that is: gather materials after the heating of compound amalgamator heating drum, put into compound and mix cylinder, when normal dry mixing, gather materials and add the aluminate coupling agent of 0.9kg by every 1000kg, evenly stirring 10～25s finishes the surface modification to gathering materials, and adds modified filler, pitch subsequently and normally mixes and stirs the production asphalt;
2. filler modified: the modification to filler can be used the powder surface modification machine in the filler production process or before using, and by the aluminate coupling agent of every 1000kg filler adding 4.0kg, finishes the surface modification to filler.
3. reclaim the dust modification: compound is mixed and stirred the recovery dust that produces in the process, use the powder surface modification machine, reclaim the aluminate coupling agent that dust adds 3.5kg, finish to reclaiming the surface modification of dust by every 1000kg.
The mineral aggregate surface-modifying agent should be wrapped up in attached even, and high temperature resistant (decomposition temperature is not less than 210 ℃), the surface property oleophyllie hydrophobic of mineral aggregate strengthens the cohesive force between mineral aggregate and the pitch.
Use the asphalt technical indicator of modified mineral aggregate as follows:
Marshall stability index: Marshall stability 12.30kN, flow valuve 2.8mm.
Immersion Marshall Test residual stability, 90%; The retained strength ratio of freeze thawing split test, 88%.
High temperature stability performance: dynamic stability=1310 time/mm (60 ℃ of wheel tracking tests)
Low-temperature performance: flexural failure strain=2380 μ ε (10 ℃ of pliability tests)
Embodiment 3
Coupling agent is a silane coupling agent: aminopropyl triethoxysilane KH-550
1. the modification of gathering materials: carry out surface modification in the asphalt production process to gathering materials, that is: gather materials after the heating of compound amalgamator heating drum, put into compound and mix cylinder, when normal dry mixing, gather materials and add the silane coupling agent of 0.9kg by every 1000kg, evenly stirring 10～25s finishes the surface modification to gathering materials, and adds modified filler, pitch subsequently and normally mixes and stirs the production asphalt;
2. filler modified: the modification to filler can be used the powder surface modification machine in the filler production process or before using, and presses the silane coupling agent that the 1000kg filler adds 4.5kg, finishes the surface modification to filler.
3. reclaim the dust modification: compound is mixed and stirred the recovery dust that produces in the process, use the powder surface modification machine, press 1000kg and reclaim the silane coupling agent that dust adds 4kg, finish to reclaiming the surface modification of dust.
The mineral aggregate surface-modifying agent should be wrapped up in attached even, and high temperature resistant (decomposition temperature is not less than 210 ℃), the surface property oleophyllie hydrophobic of mineral aggregate strengthens the cohesive force between mineral aggregate and the pitch.
Use the asphalt technical indicator of modified mineral aggregate as follows:
Marshall stability index: Marshall stability 10.2kN, flow valuve 3.4mm.
Immersion Marshall Test residual stability, 93%; The retained strength ratio of freeze thawing split test, 91%.
High temperature stability performance: dynamic stability=1200 time/mm (60 ℃ of wheel tracking tests)
Low-temperature performance: flexural failure strain=2510 μ ε (10 ℃ of pliability tests)
Claims (3)
1. modified mineral aggregate that bituminous pavement is used obtains in order to method down:
The modification of gathering materials: carry out surface modification in the asphalt production process to gathering materials, gather materials after the heating of compound amalgamator heating drum, put into compound and mix 175～200 ℃ of normal dry mixing down of cylinder, gathering materials by every 1000kg adds the coupling agent of 0.5～5kg, stirs to finish surface modification to gathering materials;
Filler modified: as in the filler production process,, to finish surface modification to filler by the coupling agent of every 1000kg filler adding 3～20kg;
Reclaim the dust modification: compound is mixed and stirred the recovery dust that produces in the process, reclaim the coupling agent that dust adds 2～15kg, finish to reclaiming the surface modification of dust by every 1000kg.
2. the production method of the modified mineral aggregate used of a bituminous pavement may further comprise the steps:
The modification of gathering materials: carry out surface modification in the asphalt production process to gathering materials, gather materials after the heating of compound amalgamator heating drum, put into compound and mix cylinder, 175～200 ℃ of normal dry mixing down, gathering materials by every 1000kg adds the coupling agent of 0.5～5kg, stirs to finish surface modification to gathering materials;
Filler modified: as in the filler production process,, to finish surface modification to filler by the coupling agent of every 1000kg filler adding 3～20kg;
Reclaim the dust modification: compound is mixed and stirred the recovery dust that produces in the process, reclaim the coupling agent that dust adds 2～15kg, finish to reclaiming the surface modification of dust by every 1000kg.
3. production method according to claim 2 is characterized in that: coupling agent is selected from one or more mixing in titanate ester, aluminium esters of gallic acid, silicane, the zircoaluminate.
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| CNB2006100168084A CN100417614C (en) | 2006-04-28 | 2006-04-28 | Modified mineral aggregate for bituminous pavement and method for producing same |
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| CNB2006100168084A CN100417614C (en) | 2006-04-28 | 2006-04-28 | Modified mineral aggregate for bituminous pavement and method for producing same |
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| CN100417614C true CN100417614C (en) | 2008-09-10 |
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Cited By (1)
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| CN101941817A (en) * | 2010-11-05 | 2011-01-12 | 吉林大学 | Hydrophobic and lipophilic modified asphalt and production method thereof |
Families Citing this family (5)
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| CN102464892B (en) * | 2010-11-13 | 2013-10-16 | 万华化学集团股份有限公司 | Composite polyurethane modifier for road asphalt |
| CN104086219B (en) * | 2014-06-26 | 2016-05-04 | 华南理工大学 | A kind of building stones surface property improves system and method |
| CN106746927B (en) * | 2016-12-27 | 2019-02-12 | 华北水利水电大学 | Nano-compound modified asphalt and preparation method thereof |
| CN107473635B (en) * | 2017-09-04 | 2020-09-01 | 东阳市新越建设有限公司 | Asphalt concrete and preparation process thereof |
| CN110092604B (en) * | 2019-05-20 | 2022-05-06 | 长沙理工大学 | Method for improving adhesion performance of asphalt and aggregate interface |
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| CN1597786A (en) * | 2004-08-18 | 2005-03-23 | 杨林江 | Powder material for road and its preparation method |
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| CN101941817A (en) * | 2010-11-05 | 2011-01-12 | 吉林大学 | Hydrophobic and lipophilic modified asphalt and production method thereof |
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