CN102134828A - Asphalt foaming method using foaming agent as additive - Google Patents
Asphalt foaming method using foaming agent as additive Download PDFInfo
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- CN102134828A CN102134828A CN 201110027309 CN201110027309A CN102134828A CN 102134828 A CN102134828 A CN 102134828A CN 201110027309 CN201110027309 CN 201110027309 CN 201110027309 A CN201110027309 A CN 201110027309A CN 102134828 A CN102134828 A CN 102134828A
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Abstract
The invention is an asphalt foaming method using a foaming agent as an additive, and the method comprises the following steps: (1) adding a certain amount of asphalt into an asphalt mixer, simultaneously adding a foaming agent with a mass being 0.8%-1% of the mass of the asphalt, wherein the asphalt mass is 4%-6% of the total mass of stones; (2) heating and stirring with a temperature of the asphalt mixer being set to 150 DEG C, and continuing to stir for 0.5 hours after the temperature of the asphalt mixer reaches 150 DEG C; (3) adding stones into a stone mixer, heating and stirring with a temperature set to 100-120 DEG C; (4) spraying the melt foamed asphalt in a spray form into the stones for stirring. The beneficial effects of the invention are that: (1) the foaming agent is decomposed and releases gas to form small bubbles on the surface of the asphalt, which increases the specific surface area of the asphalt, decreases the viscosity of the asphalt, and improves the maneuverability of the asphalt under relatively low temperature conditions; (2) the asphalt after being foamed has a porous structure which has the effects of noise reduction and noise removal.
Description
Technical field
The present invention relates to the asphalt foaming technical field, mainly be a kind of be the asphalt foaming method of additive with the blowing agent.
Background technology
Flourish along with the highway in China communication, expressway construction makes rapid progress, and through the construction in more than 20 years, the speedway total kilometrage leapt to the second place of the world, and freeway net and state's provincial highway main line are shaped substantially.At present, semi-rigid asphalt pavement is still the primary structure form of China's road, along with the continuous increase of the traffic volume, and the heavy-duty of vehicular load, the communications and transportation of China presents the characteristics of " big flow, heavy duty and canalized traffic ".Along with the road growth in age, pitch is aging gradually, and the rutting resistance of bituminous concrete, resisting temperature crack ability, antifatigue damage capability, anti-loose ability all weaken gradually.Flexible pavement in use, early damage phenomenons such as structural destruction, serious water destruct, serious rut, face checking are more and more serious, the flexible pavement of building at the beginning of twentieth century the 80s and 90s has entered the large-scale maintenance phase in advance.How select rationally with suiting measures to local conditions, the constructing road technology of science, prolong operating period of flexible pavement, guarantee the service quality of existing road, be current and the subject matter that faced of highway administration from now on and maintenance department.
Known pitch and building stones hybrid technique be, pitch is heated to be molten, and building stones join 150 ℃, the pitch of molten is sprayed in the building stones mixes (3.5%-6.5% that the mass fraction of pitch is gross mass).But the existing problem of the method is: 1. building stones adopt heat-conducting oil heating to 150 ℃, emit a large amount of toxic gases because conduction oil is met thermal decomposition, and health and environment are caused very big influence; Though 2. pitch is the higher boiling organic compound, its contained fluorescent material has carcinogenicity, evaporates with flue gas during high-temperature process, and environment and health are all had certain danger.Therefore along with the development of road traffic technology, modified bitumen, foaming pitch is fade-in people's sight, by using modified bitumen, foamed asphalt, increase the specific area of pitch and building stones, reduce the surface viscosity of pitch, thereby make pitch just can mix thoroughly and coat at a lower temperature with building stones.And the asphalt foaming technology takes certain measure that pitch is expanded exactly, thereby reduces its surface viscosity, makes its easier building stones that wrap, but improves the workability of pitch under the lower temperature.Simultaneously, wrap up in the porosity that the part bubble that is attached in the pitch has increased pitch, improved reflection and the diffuse reflection of road surface, reach noise reduction to a certain extent and remove the purpose of making an uproar noise.The policy of national energy-saving and emission-reduction has also been complied with in the use of foaming pitch.
Always the research of coming of asphalt foaming and foamed asphalt compound branch, this had isolated relation between the two to a certain extent in the past, in fact, and the foamed asphalt compound that one-side asphalt foaming effect differs and obtains function admirable surely.It is the expanded material of additive as pitch that the present invention adopts with the blowing agent, is sprayed in the building stones with spray form.Tested the stability and the sulfur number of compound simultaneously,, prove that the pitch that adds blowing agent meets national performance indications to pitch by test, and can be with the heating-up temperature of compound 50 ℃ of the highest reductions.
Summary of the invention
Purpose of the present invention will overcome the deficiency of above-mentioned technology just, is the asphalt foaming method of additive with the blowing agent and provide a kind of, by adding blowing agent, can increase the specific area of pitch, and it just can be mixed thoroughly with building stones at a lower temperature.
The present invention solves the technical scheme that its technical problem adopts: this is the asphalt foaming method of additive with the blowing agent, adopt blowing agent as additive, under the pitch molten condition, foam, the pitch volume is increased, thereby increase the specific area of pitch, can reduce the heating-up temperature of mixing building stones simultaneously.This method comprises following step:
(1), in asphalt mixer, add a certain amount of pitch, add the blowing agent of 0.8%-1% asphalt quality simultaneously, asphalt quality is the 4%-6% of building stones gross mass; The blowing agent mass fraction that adds is up to 1% of asphalt quality, and too high meeting reduces pitch viscosity, causes the less stable of bituminous mixture.For example add 1% blowing agent, the pitch volume can increase 20%, and the heating-up temperature of building stones can be reduced to 100 ℃.
(2), the asphalt mixer temperature is set to 150 ℃, adds thermal agitation, when treating that the asphalt mixer temperature reaches 150 ℃, continues to stir 0.5 hour, and blowing agent is fully decomposed, and can make the abundant mixing of pitch and bubble again;
(3), building stones are added in the building stones mixer, add thermal agitation, temperature is set at 100-120 ℃; To get rid of the moisture in the building stones, also can make foaming pitch and the abundant mixing of building stones simultaneously; Than 50 ℃ of the highest reductions of prior art building stones temperature, saved the energy greatly.
(4), the foaming pitch of molten is sprayed in the building stones with spray form stirs, guaranteed fully mixing thoroughly of a small amount of pitch and building stones like this, avoided pouring type to bring the low phenomenon of pitch utilization rate, also saved asphalt content to a certain extent.
As preferably, described blowing agent is that decomposition temperature is lower than 150 ℃ blowing agent, is one or more composite blowing agent of inorganic foaming agent, azo foaming agent, nitroso blowing agent, hydrazides class blowing agent etc.
The effect that the present invention is useful is: 1. gas is emitted in the blowing agent decomposition, forms little bubble at asphalt surface, has increased the specific area of pitch, reduces pitch viscosity, has improved the operability of pitch under the lower temperature condition; 2. have loose structure through the pitch after the foaming, played noise reduction and removed the effect of making an uproar.
The specific embodiment
In order to make purpose of the present invention, technical scheme and advantage clearer,, the present invention is further elaborated below in conjunction with for example.Should be appreciated that described hereinly, and be not used in qualification the present invention for example only in order to explaining the present invention.
Of the present invention this be the asphalt foaming method of additive with the blowing agent, comprise following step:
(1), in asphalt mixer, add a certain amount of pitch, add the blowing agent of 0.8%-1% asphalt quality simultaneously, asphalt quality is the 4%-6% of building stones gross mass;
(2), the asphalt mixer temperature is set to 150 ℃, adds thermal agitation, when treating that the asphalt mixer temperature reaches 150 ℃, continue to stir 0.5 hour;
(3), building stones are added in the building stones mixer, add thermal agitation, temperature is set at 100-120 ℃;
(4), the foaming pitch of molten is sprayed in the building stones with spray form stirs.
As preferably, described blowing agent is that decomposition temperature is lower than 150 ℃ blowing agent, is one or more composite blowing agent of inorganic foaming agent, azo foaming agent, nitroso blowing agent, hydrazides class blowing agent.
Embodiment 1
At first, take by weighing 0.21kg pitch, 5kg sandstone, 18g DNA (150 ℃ of decomposition temperatures, inorganic foaming agent), together pour into blowing agent and pitch in the mixer, add thermal agitation, treat that temperature arrives 150 ℃, continue to stir 0.5h, simultaneously sandstone are poured in another mixer and added thermal agitation, temperature is made as 100 ℃.Foaming pitch is sprayed in the sandstone in the stirring with spray form.Get the pitch and the sandstone of equal in quality simultaneously, mix stirring with same method, the back cooling that stirs, test sandstone performance, the pitch volume that the pitch volume ratio of adding blowing agent does not add blowing agent has increased 20%, and stability and sulfur number all reach the national requirements level.
Embodiment 2
At first, take by weighing 0.23kg pitch, 5kg sandstone, 18g HH138 (136 ℃ of decomposition temperatures, nitroso blowing agent), together pour into blowing agent and pitch in the mixer, add thermal agitation, treat that temperature arrives 150 ℃, continue to stir 0.5h, simultaneously sandstone are poured in another mixer and added thermal agitation, temperature is made as 110 ℃.The test performance of asphalt mixture, the pitch volume that the pitch volume ratio of adding blowing agent does not add blowing agent has increased 25%, and stability and sulfur number all reach the national requirements level.
Embodiment 3
At first, take by weighing 0.25kg pitch, 5kg sandstone, 15gAC5000-1 (143 ℃ of decomposition temperatures, azoic foaming agent), together pour into blowing agent and pitch in the mixer, add thermal agitation, treat that temperature arrives 150 ℃, continue to stir 0.5h, simultaneously sandstone are poured in another mixer and added thermal agitation, temperature is made as 120 ℃.Foaming pitch is sprayed in the sandstone in the stirring with spray form.After tested, the pitch volume that the pitch volume ratio of adding blowing agent does not add blowing agent has increased 40%, and stability and sulfur number all reach the national requirements level.
The present invention is based on the theory of foamed asphalt; foamed asphalt is to introduce steam can produce a large amount of asphalt foams in heated bitumen; these foamed asphalts can be stablized gravel effectively; loess; roads such as sand material; foamed asphalt is extensively applied in the real road construction always; but expansion gradually along with oil extraction; people are faced with oil crisis; how effectively to utilize petroleum resources to become present emphasis problem; pitch is the residue of Petroleum refining product; composition mostly is high-molecular hydrocarbons; these hydrocarbons are once high temperature; can discharge a small amount of flue gas harm humans health; if reduce asphalt temperature, can significantly reduce the harm of road surface construction to environment and human health.The main material that the road surface construction is adopted is sandstone, inorganic matters such as loess, be difficult to mixing with organic pitch, often need building stones are heated to 150 ℃, the electric energy that a large amount of sandstone heating are spent and the financial cost that toxic gas brought and the environmental hazard of heat medium conduction oil volatilization all are immeasurable.If reduce the building stones heating-up temperature, will save financial cost greatly, can improve the environmental problem that the road surface construction is brought simultaneously.
With the blowing agent is the asphalt foaming method of additive, has overcome above shortcoming, is a kind of novel asphalt foaming technique.If add 1% blowing agent, the pitch volume can increase 20%.The building stones temperature can reduce by 50 ℃ simultaneously.By test, the performance of asphalt pavement mixture meets national performance indications fully.Therefore the technology that with the blowing agent is the additive improved bituminous mixture is a kind of novel ground surface material new technology with prospectization, in today that traffic is extended in all direction, has also brought new vitality for the social energy and human health.
Be understandable that, for a person skilled in the art, technical scheme of the present invention and inventive concept be equal to replacement or change the protection domain that all should belong to the appended claim of the present invention.
Claims (2)
1. one kind is the asphalt foaming method of additive with the blowing agent, and it is characterized in that: this method comprises following step:
(1), in asphalt mixer, add a certain amount of pitch, add the blowing agent of 0.8%-1% asphalt quality simultaneously, asphalt quality is the 4%-6% of building stones gross mass;
(2), the asphalt mixer temperature is set to 150 ℃, adds thermal agitation, when treating that the asphalt mixer temperature reaches 150 ℃, continue to stir 0.5 hour;
(3), building stones are added in the building stones mixer, add thermal agitation, temperature is set at 100-120 ℃;
(4), the foaming pitch of molten is sprayed in the building stones with spray form stirs.
2. according to claim 1 is the asphalt foaming method of additive with the blowing agent, it is characterized in that: described blowing agent is that decomposition temperature is lower than 150 ℃ blowing agent, is one or more composite blowing agent of inorganic foaming agent, azo foaming agent, nitroso blowing agent, hydrazides class blowing agent.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2011100273096A CN102134828B (en) | 2011-01-20 | 2011-01-20 | Asphalt foaming method using foaming agent as additive |
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| CN2011100273096A CN102134828B (en) | 2011-01-20 | 2011-01-20 | Asphalt foaming method using foaming agent as additive |
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| CN102134828A true CN102134828A (en) | 2011-07-27 |
| CN102134828B CN102134828B (en) | 2012-08-22 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106046821A (en) * | 2016-08-16 | 2016-10-26 | 东莞泰和沥青产品有限公司 | Foam modified asphalt composition |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0116816A1 (en) * | 1983-01-20 | 1984-08-29 | Ab Skanska Cementgjuteriet | Method of re-using asphalt covering and asphalt covering mass produced according to the method |
| JP2000191946A (en) * | 1998-12-25 | 2000-07-11 | Nippon Hodo Co Ltd | Emulsion and utilization thereof |
| CN1948398A (en) * | 2005-10-11 | 2007-04-18 | 锦湖石油化学株式会社 | Foam asphalt modifier for road surface and method for making same |
| CN101228235A (en) * | 2005-07-28 | 2008-07-23 | 道达尔法国公司 | Method for preparing bitumen base |
-
2011
- 2011-01-20 CN CN2011100273096A patent/CN102134828B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0116816A1 (en) * | 1983-01-20 | 1984-08-29 | Ab Skanska Cementgjuteriet | Method of re-using asphalt covering and asphalt covering mass produced according to the method |
| JP2000191946A (en) * | 1998-12-25 | 2000-07-11 | Nippon Hodo Co Ltd | Emulsion and utilization thereof |
| CN101228235A (en) * | 2005-07-28 | 2008-07-23 | 道达尔法国公司 | Method for preparing bitumen base |
| CN1948398A (en) * | 2005-10-11 | 2007-04-18 | 锦湖石油化学株式会社 | Foam asphalt modifier for road surface and method for making same |
Non-Patent Citations (2)
| Title |
|---|
| 《公路》 20100630 吴隆德等 《沥青发泡技术的应用综述》 197-200 , 第6期 2 * |
| 《建筑材料学报》 20100430 何亮等 《发泡剂对沥青发泡和混合料水稳定性的影响》 198-202 第13卷, 第2期 2 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106046821A (en) * | 2016-08-16 | 2016-10-26 | 东莞泰和沥青产品有限公司 | Foam modified asphalt composition |
| CN106046821B (en) * | 2016-08-16 | 2018-07-13 | 东莞泰和沥青产品有限公司 | A kind of foaming modification bituminous composition |
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| CN102134828B (en) | 2012-08-22 |
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