CN104926202A - bituminous mixture - Google Patents
bituminous mixture Download PDFInfo
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- CN104926202A CN104926202A CN201510402926.8A CN201510402926A CN104926202A CN 104926202 A CN104926202 A CN 104926202A CN 201510402926 A CN201510402926 A CN 201510402926A CN 104926202 A CN104926202 A CN 104926202A
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Abstract
The invention discloses bituminous mixture. The bituminous mixture is characterized in that the bituminous mixture comprises pitch, macadam, mortar, continuous basalt fibers and mineral powders. The bituminous mixture comprises, by weight, 18-22 parts of pitch, 12-34 parts of mortar, 18-42 parts of continuous basalt fibers and 5-16 parts of mineral powders. The continuous basalt fibers are added into the bituminous mixture to improve the strength, the high-temperature-resisting performance and the low-temperature resisting performance of the bituminous mixture, the road surface manufactured with the bituminous mixture cannot be destroyed no matter in snow-ice weather in northern area or under the solarization in southern area, the surface evenness is good, a track also cannot be left, and a potential safety hazard caused by the track is removed.
Description
Technical field
The invention belongs to road and bridge construction field, particularly relate to the asphalt as highway pavement.
Background technology
There are bituminous pavement and cement pavement in the road surface of motorway or avenue highway, and the friction of bituminous pavement to tire is little, but to hot day by thermal softening, rut is formed after automobile rolls, bonding pitch on tire, one is easily cause traffic accident, but larger to tire infringement.And cement pavement is large to the friction of tire, large to the wearing and tearing of tire, and cost is higher.
Therefore, the many employings in road surface of laying now be asphaltic road-mix surface course, existing asphalt is different by binder used, that can be divided into petroleum pitch with two large classes that are coal-tar pitch; Some country also has and adopts or mix rock asphalt mixing.By kind difference of gathering materials used, can be divided into rubble, gravel, chiltern, several classes of slag, adopt the most general with rubble.Different by compound maximum particle size, the number classes such as coarse grain (less than 35 ~ 40 millimeters), middle grain (less than 20 ~ 25 millimeters), particulate (less than 10 ~ 15 millimeters), sand grains (less than 5 ~ 7 millimeters) can be divided into.Different by the compaction rate of compound, can be divided into the number classes such as close-graded, half open gradation and open gradation, open mix also claims asphalt macadam.Wherein heat mix heat paving close-graded macadam-aggregate mix durable in use, intensity is high, good integrity, is the representative materials of building senior bituminous pavement, applies the widest.Various countries work out bituminous concrete different specifications, the heat that China formulates mixes hot petrolize compound technical specifications, is called bituminous concrete, is subdivided into again I type and II type with voidage 10% and following person, the porosity of I type is 3 (or 2) ~ 6%, belongs to level of confidentiality distribution type; II type is 6 ~ 10%, belongs to half open gradation type; Voidage more than 10% person is called asphalt macadam, belongs to open gradation type.
Existing asphalt mainly contains following several:
Asphalt mixture with plentiful aggregate (SAC)
Compared with large discharge vehicle on a highway safety, comfortablely to pass through at high speed, oil mat must have good cling property.This just requires that oil mat not only will have larger coefficient of friction, and will have darker surface texture depth (construction depth is that high speed traveling sound reduction floats with minimizing water " LM ", dabbling affects the principal element of driver's sight line).Achievement in research in recent years shows: " cling property of oil mat is formed by the microtexture of surface layer structure and macrostructure two portions.Wherein macrostructure derives from the proportioning of asphalt, thickness, the decision of grating form primarily of aggregate ".
The mid-80 China starts to build high-grade highway, the structure formation from oil mat: I type bituminous concrete, voidage 3% ~ 6%, water-permeable is little, good endurance, and the frictional coefficient of upper layer can reach requirement, but surface texture depth is less, far requirement can not be reached.II type bituminous concrete voidage 6% ~ 10%, surface structure is dark, and non-deformability is comparatively strong, but its water-permeable, weather resistance are poor.In order to solve the cling property (particularly upper layer is when construction depth is larger, has again the structure formation of good water-repellancy) of oil mat, stone asphalt Course is studied and is used.
Asphalt mixture with plentiful aggregate
Asphalt mixture with plentiful aggregate adopts more coarse crushing stone to form skeleton, and asphalt sand mastic fills the hole in skeleton and the asphalt form making skeleton glued together and formed.Specifically consist of: content of coarse aggregate 69% ~ 78%, breeze 6% ~ 10%, bitumen aggregate ratio about 5%.Through facts have proved of several high highways, stone asphalt Course can provide darker surface structure, there is again the such less space of traditional I type bituminous concrete and less water-permeable, there is again good ability of anti-deformation (dynamic stability is higher) simultaneously.In other words, " many rubbles bituminous concrete had both had the advantage of traditional I type bituminous concrete, had again the advantage of II type bituminous concrete, turn avoid the deficiency of two kinds of traditional asphalt concrete structure forms simultaneously.”
Stone mastic asphalt (SMA)
The German traffic of the sixties is very flourishing, and according to the climatic characteristic (summer temperature about 20 DEG C, winter is not too cold) of this country, custom builds " pouring asphalt concrete " road surface.This structure Asphalt Content about 12%, breeze content is high.Use the rut on middle discovery road surface very serious, in addition at that time the automobile of this country in order to anti-skidding needs, the tire (comprising some countries of Europe also like this) of frequent use band nail, consequently pavement abrasion very serious (1 year can thinning about 4cm).In order to overcome day by day serious rut, reduce the abrasion on road surface, the proportioning of highway work person to asphalt adjusts, and increases the ratio of coarse aggregate, adds fiber stabilizer, defines the first shape of SMA structure.Within 1984, German traffic department has formally formulated the design and construction specification on a SMA road surface, and SMA pavement structure form is able to perfect substantially.This novel pavement structure is successively promoted gradually in Germany, some countries of Europe, is used.At the beginning of the nineties, American Highway circle thinks that its Pavement Road Surface Quality is good not as the pavement quality of European countries.Through investigating the gap finding existence two aspects: 1. in the utilization of modifying asphalt; 2. in the structure formation on road surface (i.e. SMA).1991, within 1992, start to be studied, promote this structure formation of SMA, most typical: nineteen ninety-five Atlanta for hosting the Olympic Games reconstruction and newly-built is carried out to network of highways, all have employed this structure formation of SMA and do road surface.
Stone mastic asphalt road surface (SMA)
Stone mastic asphalt (SMA) is a kind of with the bitumastic binder of pitch, breeze and fiber stabilizer composition, is filled in the mineral aggregate skeleton of gap grading, the compound formed.Its composition characteristic mainly comprises two aspects: the structural framework of mutual interlocking composition high stability (non-deformability is strong) of the coarse aggregate that 1. content is more; 2. the bitumastic that forms of fine aggregate breeze, pitch and fiber stabilizer skeleton is cementing together with, and fill skeleton space, make compound have flexible and weather resistance preferably.
The structure composition of SMA can be summarized as " three-many-one-little, that is: coarse aggregate is many, breeze is many, pitch is many, fine aggregate is few ".Specifically: 1. SMA is a kind of asphalt of gap grading, the coarse aggregate ratio of more than 5mm is up to 70% ~ 80%, and the consumption of breeze reaches 7% ~ 13%, (" Ratio of filler bitumen " exceeds the restriction of general value 1.2).The gap grading formed thus, seldom uses fine aggregate; 2. for adding more pitch, increasing breeze consumption on the one hand, using fiber as stablizer simultaneously; 3. asphalt content is more, and up to 6.5% ~ 7%, cohesiveness requires high, and wishes to select the pitch (preferably adopting modifying asphalt) that penetration degree is little, softening temperature is high, temperature stability is good
The feature of SMA: stone mastic asphalt is that a kind of non-deformability of current generally acknowledged (using more) is in the world strong, the good bituminous mixtures for pavement surface of weather resistance.Due to the good embedded squeezing of coarse aggregate, compound has extraordinary high temperature rutting resistance, and simultaneously due to the cohesive action of bitumastic, low-temperature deformation performance and water stability also have more improvement.Add fiber stabilizer, make asphaltic binder keep high viscosity, it paves better with consolidation effect.Gap grading forms macrovoid on surface, and construction depth is large, and cling property is good.The space of compound is very little again simultaneously, and ageing-resistant performance and weather resistance are all fine, thus improve the Pavement Performance of asphalt comprehensively.
Rubber asphalt (AR)
Rubber asphalt first junked tire protoplasm is processed into rubber powder, combine in certain thickness grating ratio again, add multiple high polymers properties-correcting agent simultaneously, and under the hot conditions of abundant mix (more than 180 DEG C), the cementing material of modifying asphalt formed afterwards with the fully molten swollen reaction of matrix pitch.Rubber asphalt has the performances such as high-temperature stability, low temperature flexibility, resistance to deterioration, fatigue resistance, water resistant damageability, is ideal environment-friendly type ground surface material, is mainly used at present in stress absorbing layer in road structure and upper layer.
Rubber asphalt, through the application of 50 years, defines two ripe graded mixture product lines.Compared with conventional pitch compound, rubber-asphalt mixture has higher asphalt content (about 7.5%).
Open mix (AR-OGFC): the aggregate blending being master by high consumption rubber asphalt (9-10%) and single particle size rubble forms.
Speciality and application: open mix has good antiskid, splash-proof, noise-reducing and lasting stability is the ideal surfaced layer material of motorway and urban express way.The Reflective Cracking Resistance that open mix is outstanding simultaneously, is widely used in cement pavement ultrathin overlay.
Gap-graded mix (AR-GAP): formed by median diameter gap grading and rubber asphalt mix.Dynamic stability reaches more than 3000, and freeze-thaw split value reaches more than 80.
Speciality and application: owing to possessing good surface structure, dense water, anti-shear stability, gap grading and compound are widely used in intersection and the more urban road surface layer of speed change and reinforced structure.
The performance advantage of Rubber-Asphalt Pavement:
Excellent fatigue resistance improves the endurance quality on road surface;
Because agglutinate content is high, good springiness, improve the resistivity of road surface to fatigue crack, reflection crack;
Stronger low temperature flexibility alleviates the temperature sensitivity on road surface;
Because agglutinate content is high, oil film is thick and in tire containing antioxidant, therefore improve that road is anti-aging, resistance of oxidation;
Excellent Rut resistance, permanent deformation resistance;
Because the weather resistance of road is improved, the maintenance costs of road is significantly reduced;
A large amount of use junked tire, had both saved the energy, had also been conducive to environment protection;
Carbon black in rubber can make road surface black preserve for a long time, high with the contrast gradient of graticule, improves the security of road;
When rubber asphalt is used for asphalt, because construction thickness is thin, construction rapidly, shortens the engineering time.
Superpave asphalt (SUP)
Superpave asphalt is one of achievement in research of American strategy Highway Research Program (SHRP).Superpave is the abbreviation of Superior Performing Asphalt Pavement, the Chinese meaning is exactly " high performance asphalt pavement " Superpave Asphalt Mixture Design method is a kind of brand-new Asphalt Mixture Design method, comprise asphaltic binder specification, design of Asphalt Mix Volume, computer software and relevant use equipment, test method and standard.Sperpave asphalt mixture design is divided into three levels: mixture volume design also claims level I design, uses gyratory compactor (SGC) and requires to select asphalt content according to Volume design.The medium Pavement Performance level design of compound also claims level II to design, and is designed to basis with mixture volume, and additional one group of SST and IDT test is to reach a series of performance prediction.The highest Pavement Performance level design of compound also claims level III to design, and is designed to basis with mixture volume, and additional SST and IDT test tests in a wide temperature variation range.Owing to containing trial stretch and result widely, analyze completely and more reliable performance prediction level can be provided.Superpave Asphalt Mixture Design system is weather according to project location and design traffic capacity, Material selec-tion and asphalt mixture design are all concentrated in volume-designed method, the method requires when Designing Asphalt Pavement, take into full account affects to temperature road pavement within the period of service, require road surface with can meeting high-temperature behavior requirement when the highest design temperature, do not produce excessively rut; When road surface minimum temperature, with can meeting low-temperature performance requirement, avoids or reduces cold cracking; Fatigue cracking is controlled within the scope of normal temperature.For asphaltic binder, adopt rotary thin film in drying oven test to simulate asphalt and to mix and stir and to pave in engineering aging; Adopt aging in pavement usage engineering of pressure aging vessel PAV simulation pitch.For gathering materials, when carrying out mixture gradation design, the concept of reference mark and restricted area is adopted to limit, optimization test gradation design.For asphalt, after mixing, to pave in compacting process aging mixing and stirring to adopt short ageing to simulate asphalt, and bitumen mixture specimen adopts rotary compactor to prepare.In test specimen compacting process, the relation of record gyratory compaction number of times and height of specimen, thus asphalt mixture volume characteristic is evaluated.So-called Superpave mixture volume design is voidage according to asphalt, void in mineral aggregate, pitch interstitial rate equal-volume characteristic carry out hot-mix asphalt mixture design, method mainly contains that designing material is selected, asphalt mixes and stirs, asphalt mixture volume analysis and compound checking, comprises bulk property and water sensitivity.Asphalt mixture volume design process forms primarily of four parts: 1. Material selec-tion; 2. aggregate grading is selected; 3. asphalt optimum asphalt content is determined; 4. assess the checking of asphalt, comprise bulk property and water sensitivity.Suerpave asphalt mixture volume design method all has strict regulation to material, aggregate grading, compound, and has formulated and strictly regulate requirement accordingly, comprises agglutinate specification, aggregate specification, compound specification.
SBS modified asphalt concrete (SBS)
SBS modifying asphalt is on the basis of original matrix pitch, the SBS modifier of admixture 2.5%, 3.0%, 4.0%, modified pitch, and compared with protobitumen, its high temperature viscosity increases, and softening temperature raises.Under good design mixture proportion and execution conditions, weather resistance and the high-temperature stability of bituminous pavement significantly improve.
Modifying asphalt and Indexes of Evaluation Effect thereof
So-called modifying asphalt, also modified asphalt mixture is comprised, refer to " additive (properties-correcting agent) such as admixture rubber, resin, high molecular polymer, levigate rubber powder or other fillers; or take measures such as pitch mild oxidation processing, the performance of pitch or asphalt is improved and the asphaltic binder made ".Properties-correcting agent refers to " the natural or artificial organic or inorganic material added in pitch or asphalt; melting, be dispersed in pitch improves or improve the material of bituminous pavement property (react with pitch or wrap in surface of aggregate) ".The quality of modified effect, mainly evaluate by modifying asphalt index, the evaluation index of modifying asphalt is: (1) Susceptibility Indexes: penetrative index (penetration degree).(2) low-temperature performance index: 5 DEG C of ductilities and equivalent brittle point.(3) r: 60 DEG C of viscosity, softening temperature and equivalent softening temperatures.(4) thermostability (ageing-resistant) index: rotary thin film in drying oven is tested.(5) pitch viscoelastic effect index: recovery of elasticity.6. pitch and bond stress index of gathering materials: sticky toughness test.7. construction and safety index: flash-point, 135 DEG C of kinematic viscosity.8. to emanate index: softening point difference.
Heat pressing type bituminous concrete (HRA)
Heat pressing type bituminous concrete pavement (Hot Rolled Asphalt Pavement, HRA), as a kind of bituminous concrete pavement form of uniqueness, is widely used in Britain.
All there is following defect in above-mentioned existing asphalt:
Low temperature resistant poor with resistance to elevated temperatures, cold condition for the north is little, road surface is brittle crust easily, asphalt arches upward, lose surface evenness, be in the area of exposure in sunshine for south for a long time, asphalt softens, pavement asphalt variable thickness may be there is, cause the rough defect in road surface.
Summary of the invention
In order to high temperature resistant, the defect that resistance to low temperature is poor that overcome that above-mentioned various asphalt also exists, the invention provides a kind of asphalt, this asphalt with the addition of continuous basalt fiber, strengthen the intensity of asphalt and high temperature resistant and low temperature resistant performance, can be in exposure in sunshine for a long time, can be used for again in ice and snow weather, scope of application light, long service life.
A kind of asphalt, is characterized in that: comprise pitch, rubble, mortar, continuous basalt fiber and breeze, with weight parts:
Pitch: 18 ~ 22 parts
Mortar: 12 ~ 34 parts
Continuous basalt fiber: 18 ~ 42 parts
Breeze: 5 ~ 16 parts.
Continuous continuous basalt fiber be basalt building stones after 1450 DEG C ~ 1500 DEG C meltings, by the continuous fibre of platinum rhodium bushing high speed pulling.Be similar to glass fibre, its performance is between high strength S glass fibre and alkali-free E glass fibre, and the color of pure natural continuous basalt fiber is generally brown, and some is like golden.
Described a kind of asphalt, comprises pitch, rubble, mortar, continuous basalt fiber and breeze, with weight parts:
Pitch: 20 ~ 22 parts
Mortar: 16 ~ 20 parts
Continuous basalt fiber: 18 ~ 22 parts
Breeze: 5 ~ 8 parts.
The present invention has the following advantages:
The present invention adds continuous basalt fiber in asphalt, improve the intensity of asphalt, high temperature resistant and low temperature resistant performance, no matter be northern ice and snow weather, or tanning by the sun of the southern sun, all can not destroy the road surface made from the present invention, surface evenness is good, also can not leave rut, eliminates the potential safety hazard that rut brings.
Embodiment
Embodiment 1
A kind of asphalt, is characterized in that: comprise pitch, rubble, mortar, continuous basalt fiber and breeze, with weight parts:
Pitch: 18 parts
Mortar: 34 parts
Continuous basalt fiber: 18 parts
Breeze: 16 parts.
Embodiment 2
A kind of asphalt, is characterized in that: comprise pitch, rubble, mortar, continuous basalt fiber and breeze, with weight parts:
Pitch: 22 parts
Mortar: 34 parts
Continuous basalt fiber: 42 parts
Breeze: 16 parts.
Embodiment 3
A kind of asphalt, is characterized in that: comprise pitch, rubble, mortar, continuous basalt fiber and breeze, with weight parts:
Pitch: 22 parts
Mortar: 34 parts
Continuous basalt fiber: 42 parts
Breeze: 16 parts.
Embodiment 4
A kind of asphalt, is characterized in that: comprise pitch, rubble, mortar, continuous basalt fiber and breeze, with weight parts:
Pitch: 22 parts
Mortar: 12 parts
Continuous basalt fiber: 42 parts
Breeze: 16 parts.
Embodiment 5
A kind of asphalt, is characterized in that: comprise pitch, rubble, mortar, continuous basalt fiber and breeze, with weight parts:
Pitch: 22 parts
Mortar: 34 parts
Continuous basalt fiber: 42 parts
Breeze: 16 parts.
Embodiment 6
A kind of asphalt, is characterized in that: comprise pitch, rubble, mortar, continuous basalt fiber and breeze, with weight parts:
Pitch: 18 parts
Mortar: 204 parts
Continuous basalt fiber: 20 parts
Breeze: 8 parts.
Embodiment 7
A kind of asphalt, is characterized in that: comprise pitch, rubble, mortar, continuous basalt fiber and breeze, with weight parts:
Pitch: 19 parts
Mortar: 30 parts
Continuous basalt fiber: 24 parts
Breeze: 12 parts.
Embodiment 8
A kind of asphalt, comprises pitch, rubble, mortar, continuous basalt fiber and breeze, with weight parts:
Pitch: 20 parts
Mortar: 20 parts
Continuous basalt fiber: 18 parts
Breeze: 5 parts.
Embodiment 9
A kind of asphalt, comprises pitch, rubble, mortar, continuous basalt fiber and breeze, with weight parts:
Pitch: 22 parts
Mortar: 20 parts
Continuous basalt fiber: 18 parts
Breeze: 8 parts.
Embodiment 10
A kind of asphalt, comprises pitch, rubble, mortar, continuous basalt fiber and breeze, with weight parts:
Pitch: 20 parts
Mortar: 20 parts
Continuous basalt fiber: 22 parts
Breeze: 8 parts.
Claims (2)
1. an asphalt, is characterized in that: comprise pitch, rubble, mortar, continuous basalt fiber and breeze, with weight parts:
Pitch: 18 ~ 22 parts
Mortar: 12 ~ 34 parts
Continuous basalt fiber: 18 ~ 42 parts
Breeze: 5 ~ 16 parts.
2. a kind of asphalt according to claim 1, is characterized in that: comprise pitch, rubble, mortar, continuous basalt fiber and breeze, with weight parts:
Pitch: 20 ~ 22 parts
Mortar: 16 ~ 20 parts
Continuous basalt fiber: 18 ~ 22 parts
Breeze: 5 ~ 8 parts.
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| CN201510402926.8A CN104926202A (en) | 2015-07-10 | 2015-07-10 | bituminous mixture |
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| CN201510402926.8A CN104926202A (en) | 2015-07-10 | 2015-07-10 | bituminous mixture |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106186838A (en) * | 2016-07-15 | 2016-12-07 | 黑龙江省中信路桥材料有限公司 | A kind of rubber asphalt Matrix mixing material exempting from lignin |
| CN107445518A (en) * | 2017-07-24 | 2017-12-08 | 扬州大学 | Grading basalt fibre asphalt of high fatigue resistance and preparation method thereof |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104058638A (en) * | 2014-06-09 | 2014-09-24 | 四川航天五源复合材料有限公司 | Bituminous mixture |
| CN104402315A (en) * | 2014-10-30 | 2015-03-11 | 安徽省科普产品工程研究中心有限责任公司 | Material used for rapid pavement repair and performance testing method thereof |
-
2015
- 2015-07-10 CN CN201510402926.8A patent/CN104926202A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104058638A (en) * | 2014-06-09 | 2014-09-24 | 四川航天五源复合材料有限公司 | Bituminous mixture |
| CN104402315A (en) * | 2014-10-30 | 2015-03-11 | 安徽省科普产品工程研究中心有限责任公司 | Material used for rapid pavement repair and performance testing method thereof |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106186838A (en) * | 2016-07-15 | 2016-12-07 | 黑龙江省中信路桥材料有限公司 | A kind of rubber asphalt Matrix mixing material exempting from lignin |
| CN106186838B (en) * | 2016-07-15 | 2019-01-25 | 黑龙江省中信路桥材料有限公司 | A kind of rubber asphalt Matrix mixing material for exempting from lignin |
| CN107445518A (en) * | 2017-07-24 | 2017-12-08 | 扬州大学 | Grading basalt fibre asphalt of high fatigue resistance and preparation method thereof |
| CN107445518B (en) * | 2017-07-24 | 2020-01-17 | 扬州大学 | Grading basalt fiber asphalt mixture with high fatigue resistance and preparation method thereof |
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Application publication date: 20150923 |