CN105585271B - A kind of additive and its application process for improving stability of asphalt mixture - Google Patents
A kind of additive and its application process for improving stability of asphalt mixture Download PDFInfo
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- CN105585271B CN105585271B CN201410563754.8A CN201410563754A CN105585271B CN 105585271 B CN105585271 B CN 105585271B CN 201410563754 A CN201410563754 A CN 201410563754A CN 105585271 B CN105585271 B CN 105585271B
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Abstract
The invention discloses a kind of additive and its application process for improving stability of asphalt mixture, additive of the present invention is the compound of urea and Metallic stearates, and in terms of mixture weight, urea accounts for 30% ~ 95%, the rest is stearate.Including：（1）Pitch water stability additive is added in pitch and is well mixed, is then mixed and stirred together with gathering materials in mixing equipment, prepares asphalt；Or（2）By above-mentioned additive and pitch, gather materials together with add mixing apparatus, prepare asphalt, consumption is 0.2% ~ 3.0%（Account for pitch）.Compared with traditional amine antistripping agent, additive antistripping effect of the present invention is good and cheap, in liberal supply, easy to use.
Description
Technical field
It is more particularly to a kind of to improve drip the present invention relates to a kind of additive for improving performance of asphalt mixture and its application
The additive of blue or green compound water stability and its application, especially improve asphalt immersion Marshall residual stability and jelly
Melt additive and its application of splitting parameter.
Background technology
Hot-mix asphalt mixture be the mineral aggregate that pitch and a deciding grade and level are matched somebody with somebody and miberal powder is heated mix and stir after mixing material,
It is mainly used in building bituminous paving.The projected life of general asphaltic road-mix surface course is 10 ~ 15 years.However, due to pitch mixing
The water stability of material is not enough, and many bituminous pavings of China are using in several years（In even 1 ~ 3 year）There is earlier period damage, such as cheat
The disease such as groove, loose, this has become one of principal mode of China's asphalt pavement of highway destruction.Therefore, compound
Water stability directly affects the service life of bituminous paving.
So-called Water Damage on Asphalt Pavement, i.e. stability of asphalt mixture are not enough, refer to water via asphalt surface
Hole, crack, into inside asphalt pavement, it is anti-that the water pressure and vacuum suction produced in wheel tyre dynamic loads is washed away
Under multiple effect, moisture gradually penetrates into pitch with inside mineral aggregate two-phase interface or pitch, making the adhesiveness between pitch and mineral aggregate
Reduction, and cementitiousness is gradually lost, asphalt membrane is gradually even kept completely separate from mineral aggregate sur-face peeling, go out asphalt
Now fall grain, the phenomenon such as loose, ultimately cause the globality destruction of bituminous paving.
At present, Evaluation in Water Damage of Asphalt Mixture can be roughly divided into two classes.One class is water-boiling method, will be without pressure
Real loose asphalt compound is dipped in water (normal temperature or boiling water) after a period of time, and wrapping up in for asphalt membrane is wrapped with subjective gathering materials
Attached rate peels off degree for distinguishing rule, evaluates the water stability of compound, and this method is subjectivity evaluation method.It is another kind of to comment
Valency method is bitumen mixture specimen to be placed under certain water erosion environmental condition, with the decay path of some mechanics index of physics
Spend to characterize the water stability of compound, these experiments include immersion Marshall test, diametral compression test.The present invention uses Marshall
Experiment, diametral compression test, are influenceed with the water stability and additive that this evaluates compound on stability of asphalt mixture.
According to JTJ052《Highway engineering pitch and Asphalt Mixture Experiment code》Regulation, the water stability of asphalt
It is required that see the table below 1.
The stability of asphalt mixture technical indicator of table 1
It is considered as to improve a kind of main method of compound water stabilizing to add antistripping agent.At present using more general
Time antistripping agent be all some amines or amides compound, the document and patent of this kind of asphalt antistripping agent are all very
It is many.
As CN200810044903.4 discloses a kind of road surface strengthening agent, wherein using Carlow amine or AR-78 as antistripping agent.
The price of amine or amide-type development of anti stripping agent for asphalt is high, mostly at 2 ~ 30,000 yuan/ton, and liquid or paste mostly, typically in drip
Blue or green factory or pitch storage and transport station are mixed with pitch, are formed the pitch containing antistripping agent, are then transported asphalt to again and mix and stir
Factory, production compound is mixed and stirred with gathering materials.The drawbacks of so using be, this kind of antistripping agent need under the long-time condition of high temperature with drip
Green grass or young crops storage, transport, thus degraded is easily produced, influence its antistripping effect.
In addition to development of anti stripping agent for asphalt, diatomite modified asphalt that some modified pitch, such as CN011108700.5 are related to and
Scrap rubber that CN10346039A is related to and waste plastics composite modified asphalt, essentially consist in and improve the high and low of pitch and its compound
Warm nature energy, it may have the effect of certain improvement stability of asphalt mixture.If above-mentioned modified pitch is used to improve mixed
The water stability of material is closed, the drawbacks of to exist that complex process, amount of modifier are big, cost is high etc. unconquerable.
The content of the invention
To overcome weak point of the prior art, mixed it is an object of the invention to provide a kind of suitable pitch that improves
Expect the additive of water stability, the additive for being characterized in the present invention is solid particle or powder at normal temperatures, it is easy to used, especially
It is suitable in asphalt batching plant and pitch and is directly added into mixing apparatus together with gathering materials, and completes and gathers materials herein
Mixed and stirred with bituminous cements.
One aspect of the present invention is to provide a kind of additive for being used to improve stability of asphalt mixture, described to add
Plus agent is urea composition, is the mixture of urea and stearate.With compounding substances gauge, urea accounts for 30% ~ 95%, preferably
50% ~ 80%, it the rest is stearate.Stearate of the present invention is univalent metal salt, including stearic potassium, lithium, sodium
Salt, particular certain cancers and/or divalent metal salt include stearic calcium, magnesium, zinc salt, preferred calcium salt.
Invention also provides a kind of application process for being used to improve the additive of stability of asphalt mixture, bag
Include：（1）The additive is added in pitch, then together with gathering materials in mixing equipment mix；Or（2）Will be above-mentioned
Additive and pitch, gather materials together with add mixing apparatus, prepare asphalt.The wherein addition of additive, with asphalitine
Gauge, is 0.2% ~ 3.0%.
In compound production, different trade mark pitches need different to mix and stir temperature.Asphalt mixing temperature its（0.17±
0.02）Temperature under Pa.s viscosity, is asked for according to the viscosity-temperature curve of pitch.According to code requirement, the production bar of asphalt
Part scope is shown in Table 2.
The production temperature of the hot-mix asphalt mixture of table 2（℃）
Another aspect of the present invention is to provide a kind of asphalt, wherein containing being previously used for improving asphalt water
The additive of stability, with asphalt quality percentages, 0.2% ~ 3.0%, preferably 0.6% ~ 2.0%.
In addition to the asphalt that the present invention is provided, the additive more than for improving water stability, with compound weight
Meter, in addition to：Pitch and surplus are gathered materials, and wherein the mass ratio of asphalt and aggregate is 3 ~ 10%, preferably 5%.
Gathering materials used in the present invention is the one or more during limestone, basalt, andesite, granite gather materials.
The preparation method of asphalt of the present invention, including：In advance by stirred tank, gather materials, pitch is heated to 130~165
DEG C standby, the addition that will first gather materials is to compound mixing machine, then adds into pitch the additive of the present invention, then will contain additive
Pitch be added in mixing machine, stir, obtain the present invention asphalt.Or, by above-mentioned additive and preheating
Rear pitch, gather materials adds mixing apparatus together, prepares asphalt.
Water stability of the present invention refers to that asphalt immersion Marshall test residual degree and indirect tensile test on frozen-thaw are residual
Strength ratio is stayed, its value is bigger, the water stability of compound is better.
The present invention gathers materials, Asphalt Mixture Experiment foundation《Highway engineering is gathered materials testing regulations》〔JTJ058-2000〕、《It is public
Road engineering pitch and Asphalt Mixture Experiment code》〔JTJ052-2000〕.Test mixture of the present invention uses U.S.'s MTS materials
Pilot system, other experiments are using the testing equipment for meeting national standard requirement.
The present invention urea composition additive be remarkably improved asphalt immersion Marshall residual stability and
Indirect tensile test on frozen-thaw strength ratio, hence it is evident that improve the water stability of asphalt, it will help solve the problems, such as road surface early damage.
Embodiment
The present invention program and effect are further illustrated with reference to embodiment.Percentage given in the present invention is quality
Fraction.It should be appreciated that protection scope of the present invention is not limited by embodiment.
Gather materials used in specific embodiment of the invention Asphalt Mixture for basalt, level is matched somebody with somebody from the types of AC-16 I
Value, bitumen aggregate ratio is 5.0%.Apparent density of gathering materials is shown in Table 3.
Gather materials used in the present invention of table 3 apparent density
The pitch that the present invention is used is derived from the 70A pitches of Sinopec Xi'an petrochemical industry branch company, and its property is shown in Table 4.
The asphaltic nature of table 4
Urea used in the present invention is purchased from Liaoning Hua Jin Chemical Groups, meets agricultural urea standard.
Odium stearate used in the present invention produces for Xin Wei auxiliary agents Co., Ltd of Gaomi City, and calcium stearate is Jiangxi Hongyuan
Chemical Co., Ltd.'s product.
Embodiment 1
Take it is listed earlier gather materials and pitch, pitch is first preheated to 140 DEG C.According to first gathering materials（Level, which is matched somebody with somebody, is shown in Table 2）, again drip
It is blue or green（Property is shown in Table 4）, urea composition addition sequence, to compound mixing machine add material, the weight ratio of asphalt and aggregate
For 5.0%.Urea composition is 0.8%（Account for the mass fraction of pitch）, wherein, urea accounts for 70%, and odium stearate and calcium stearate divide
Do not account for 15%.Prepare bitumen mixture specimen and carry out correlation test, determine immersion Marshall test residual degree and indirect tensile test on frozen-thaw
Retained strength ratio.Concrete outcome is referring to table 5.
Embodiment 2
Specific implementation method be the same as Example 1.Urea composition is 1.0%, and wherein urea accounts for 60%, and odium stearate 40% is not added with
Calcium stearate.
Embodiment 3
Specific implementation method be the same as Example 1.Urea composition is 1.2%, and wherein urea accounts for 75%, and calcium stearate 25% is not added with
Odium stearate.
Embodiment 4
Specific implementation method be the same as Example 1.Urea composition is 2.2%, and wherein urea accounts for 65%, and calcium stearate 25% is stearic
Sour sodium 10%.
Comparative example 1
Specific implementation method be the same as Example 1.It is not added with urea composition.
Comparative example 2
Specific implementation method be the same as Example 1.Urea composition is not added with, only adds 1.5% odium stearate.
Comparative example 3
Specific implementation method be the same as Example 1.Urea composition is not added with, only adds 1.5% calcium stearate.
Comparative example 4
Specific implementation method be the same as Example 1.Urea composition is not added with, only adds 1.5% urea.
The inventive embodiments result of table 5
As can be seen from Table 5, urea composition of the invention significantly enhances the immersion horse of asphalt and had a rest
That residual stability and indirect tensile test on frozen-thaw strength ratio, hence it is evident that improve the water stability of asphalt, it will help solve
Road surface early damage problem.
Also see to find out simultaneously, Metallic stearates act on little to the water stability for improving asphalt, and urea has
A little effects, but urea has remarkable result with stearate compounding, and this explanation has synergy between the two.
Claims (11)
1. a kind of additive for being used to improve stability of asphalt mixture, it is characterised in that：The additive combines for urea
Thing, is the mixture of urea and stearate, and described stearate is monovalent metal sodium salt and/or divalent metal calcium salt.
2. the additive according to claim 1 for being used to improve stability of asphalt mixture, it is characterised in that：To mix
Material gauge, urea accounts for 30% ~ 95%, the rest is stearate.
3. the additive according to claim 1 for being used to improve stability of asphalt mixture, it is characterised in that：To mix
Material gauge, urea accounts for 50% ~ 80%.
4. a kind of any application for being used to improve the additive of stability of asphalt mixture of claims 1 to 3, its feature
It is：Including：（1）The additive is added in pitch, then together with gathering materials in mixing equipment mix；Or（2）
By the additive and pitch, gather materials together with add mixing equipment, prepare asphalt.
5. application according to claim 4, it is characterised in that：The wherein addition of additive, with asphalitine gauge, be
0.2%~3.0%。
6. a kind of asphalt, it is characterised in that wherein described be used to improve pitch mixing containing claim 1-3 is any
The additive of water stability is expected, with asphalt quality percentages, 0.2% ~ 3.0%.
7. asphalt according to claim 6, it is characterised in that：Described is stable for improving asphalt water
The additive of property, with asphalt quality percentages, 0.6% ~ 2.0%.
8. the asphalt according to claim 6 or 7, it is characterised in that：In terms of compound weight, the pitch mixing
Material also includes：Pitch and surplus are gathered materials.
9. asphalt according to claim 8, it is characterised in that：Wherein the mass ratio of asphalt and aggregate is 3 ~ 10%.
10. asphalt according to claim 9, it is characterised in that：Wherein the mass ratio of asphalt and aggregate is 5%.
11. a kind of preparation method of any asphalts of claim 6-10, it is characterised in that：Mix is set in advance
It is standby, gather materials, pitch be heated to 130~165 DEG C it is standby, will first gather materials addition to compound mixing equipment, then into pitch add
Described additive, then the pitch containing additive is added in mixing equipment, stir, obtain described pitch mixing
Material；Or, by the additive and the pitch after preheating, gather materials together with add mixing equipment, prepare asphalt.
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| CN201410563754.8A CN105585271B (en) | 2014-10-22 | 2014-10-22 | A kind of additive and its application process for improving stability of asphalt mixture |
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| CN201410563754.8A CN105585271B (en) | 2014-10-22 | 2014-10-22 | A kind of additive and its application process for improving stability of asphalt mixture |
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| CN105585271B true CN105585271B (en) | 2017-07-28 |
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Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108285648B (en) * | 2018-02-07 | 2020-07-10 | 华东交通大学 | Pavement asphalt deicing anti-stripping additive and preparation method thereof |
| CN112745048B (en) * | 2019-10-30 | 2022-03-08 | 中国石油化工股份有限公司 | Biomass additive for asphalt and preparation method and application thereof |
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| CN101240093A (en) * | 2008-03-07 | 2008-08-13 | 成都鑫利公路材料开发有限公司 | Road surface strengthening agent |
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| CN103058585A (en) * | 2013-01-16 | 2013-04-24 | 河北工业大学 | Method for preparing polyurethane rubber granule mixture for pavement self-stress icebreaking |
| CN103205130A (en) * | 2013-04-12 | 2013-07-17 | 长安大学 | Energy-saving and environment-friendly asphalt modifier |
| CN103773025A (en) * | 2014-01-20 | 2014-05-07 | 南通东南公路工程有限公司 | Polyurethane asphalt material |
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2014
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|---|---|---|---|---|
| CN1142484A (en) * | 1995-08-10 | 1997-02-12 | 交通部重庆公路科学研究所 | Petroleum asphalt anti-releasing agent |
| CN1850928A (en) * | 2006-05-22 | 2006-10-25 | 沈阳建筑大学 | Method for manufacturing modified asphalt waterproof thermal-insulated coating |
| CN101240093A (en) * | 2008-03-07 | 2008-08-13 | 成都鑫利公路材料开发有限公司 | Road surface strengthening agent |
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| CN103058585A (en) * | 2013-01-16 | 2013-04-24 | 河北工业大学 | Method for preparing polyurethane rubber granule mixture for pavement self-stress icebreaking |
| CN103205130A (en) * | 2013-04-12 | 2013-07-17 | 长安大学 | Energy-saving and environment-friendly asphalt modifier |
| CN103773025A (en) * | 2014-01-20 | 2014-05-07 | 南通东南公路工程有限公司 | Polyurethane asphalt material |
| CN103773024A (en) * | 2014-01-20 | 2014-05-07 | 南通东南公路工程有限公司 | Amino polyvinyl alcohol emulsified asphalt waterproof material |
| CN104017376A (en) * | 2014-05-23 | 2014-09-03 | 交通运输部公路科学研究所 | Modified asphalt and preparation method thereof |
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| CN105585271A (en) | 2016-05-18 |
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