CN105271949A - Design method and preparing method for dense-gradation ultrathin paving asphalt mixture and application of asphalt mixture - Google Patents
Design method and preparing method for dense-gradation ultrathin paving asphalt mixture and application of asphalt mixture Download PDFInfo
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Abstract
The invention discloses a design method and a preparing method for a dense-gradation ultrathin paving asphalt mixture and application of the asphalt mixture. The mixture is composed of aggregate, SBS modified asphalt, a composite synergia modifying agent and mineral powder. The design method includes the steps that according to the paving layer thickness, the compaction temperature T3 is calculated through the layer bottom temperature T1 after primary pressing of a pavement paving layer and the heating temperature T2 of the modified asphalt, wherein T3=(T1+T2)/2; according to the designed compact temperature T3 and designed voidage, the estimated asphalt-aggregate ratio of the asphalt mixture is determined, and a Marshall design method is adopted for matching and forming the dense-gradation ultrathin paving mixture. The mixture can be used for the ultrathin paving layer, has the advantages of being excellent in high-temperature rutting resistance, high in water damage resistance, good in construction peaceability and the like and has the warm mixing effect, the construction temperature is lower than that of traditional modified asphalt by 10 DEG C-15 DEG C, and noise of the paved ultrathin asphalt pavement is lower than original pavement noise by 1-2 db. The material can be widely applied to an asphalt pavement, fast bridge floor curing engineering, new asphalt pavement building engineering and bridge floor paving engineering.
Description
Technical field
The present invention relates to the concrete method of design of a kind of asphalt and preparation method, particularly relate to the method for design of the ultra-thin asphalt of mating formation of a kind of close-graded, preparation method and application thereof.
Background technology
Current China expressway construction paces are accelerated, and the maintenance task of road is aggravated thereupon, and China is gradually from the construction period to maintenance transition stage.Due to China's Pavement on Semi-rigid Type Base structure, in highway early disease, reflection crack class disease is more.In addition, in China's road vehicle, heavy-duty vehicle is more, and heavy traffic phenomenon is general, and under Heavy Traffic, the early damage of bituminous pavement is serious.Under typical heavy traffic, pavement damage type is high temperature rut.Therefore, how effectively improve asphalt non-deformability and binder and cohesive force between gathering materials, become the key that can solve pavement track problem.Meanwhile, because Highway Maintenance needs quick open to traffic, therefore, rapid curing is carried out to motorway, to maintenance Pavement Condition, ensure that motorway is unimpeded, prolonging service life of pavement all has important meaning.
At present, traditional motorway rut, crack maintenance process have Novachip ultra-thin wearing layer, milling overlay, in-situ heat regeneration, micro-surface area, cover etc.But all there is limitation in these maintenance methods.Such as, traditional milling 4cm, overlays the disposal options of SMA13 compound, can not make full use of original modifying asphalt surface layer mixture, and it is serious that construction process adhesion coating destroys situation; In-situ heat regeneration construction quality is difficult to control, and on-the-spot variability is large; Micro-surface area road rumble is large, inapplicable more than the paragraph of 10mm etc. to rutting depth.In the maintenance of the disease such as motorway rut in the past, Novachip ultra-thin wearing layer technology uses more, it is wherein a solution, but this technology needs to be constructed by specific laying equipment, adopt specific modified emulsifying asphalt adhesion coating, also need the sprinkling of modified emulsifying asphalt adhesion coating and modification hot asphalt mixture to pave to carry out, this causes this technical limitation condition comparatively harsh simultaneously.Simultaneously in construction process, need to set about considering and pre-control from starting material selection, mix-design, each details of Construction control, cost is higher.
NovaChip adopts gap grading, it by 70% ~ 80% single particle size rubble, the fine aggregate of 20% ~ 30% and filler composition, asphalt content 4.6% ~ 5.6%.Require high to interlocking capability of coarse aggregate, the requirement of abrasion loss more increases, and under must meeting the requirement of Los Angeles abrasion, also needs to carry out micro-Di Faer wear test inspection.Compared with open gradation, it contains more fine aggregates, thus has better mechanical stability and resistance to shear.Compared with continuous grading, it has coarse texture, superior cling property.Novachip bituminous cements many employings high adhered modification pitch.But owing to also not having at present Experimental Method in Laboratory can the ultra-thin service condition of simulated field, therefore the design of this kind of compound mainly relies on experience.The feature of NovaChip gap grading, causes in milling overlay process, overlays position and can be formed one " tank ", causes the Moisture Damage at milling overlay position, hole groove phenomenon serious, is not suitable for milling and overlays construction.
In rut treatment procedure, if there is reflection crack, then general employing excavates the mode of changing and filling out, and adopts cracking resistance technical measures, and as pasted the mode of mylar or polyester fiber cloth, so not only operation is loaded down with trivial details, delay maintenance efficiency, and poor effect.And less to the research of top layer compound splitting resistance own, particularly at low ambient temperatures, existing common top layer compound modulus is higher, lacks good low temperature flexibility, and surface layer modulus can be caused not mate with former road surface, unfavorable to the cracking resistance of structure own.
As can be seen here, in order to improve the utilising efficiency of old pavement structure, playing the performance of upper layer modified asphalt mixture, needing to reduce the milling degree of depth to old pavement, carry out ultra-thinly mating formation; In order to comprehensively improve the Rut resistance of bituminous pavement, cracking resistance and cling property, need high performance material of paving course; In order to improve ultra-thin mat formation construction workability, energy-saving and emission-reduction, solve ultra-thin pave-load layer and to lower the temperature fast problem, need comprehensive utilization warm mix operating technique.In order to reduce the impact of pavement construction on traffick, need the operating efficiency improving maintenance of surface technology.
In existing hot-mix asphalt mixture design specifications, in order to improve construction workability, construction temperature gets according to the viscosity-temperature curve of pitch, but do not consider ultra-thin singularity of mating formation, ultra-thin rate of temperature fall in construction process of mating formation is fast, there are some researches show, the ultra-thin wearing layer of making 2.5cm, within 5 ~ 10min, mixture temperature can from 160 DEG C near 80 DEG C, and the increase of pavement thickness brings slowing down of rate of temperature fall, therefore different pave-load layer thickness needs different construction temperatures, accordingly, different compaction temperatures should be had when interior ingredient ratio designs, and different asphalt contents.Therefore, the design carrying out towards pave-load layer thickness for ultra-thin asphalt of mating formation is needed.
Because the defect that above-mentioned existing Asphalt Mixture Design and proportioning exist, the present inventor is based on being engaged in the practical experience and expertise that this type of product design manufacture enriches for many years, and coordinate the utilization of scientific principle, actively in addition research and innovation, to founding the ultra-thin asphalt of mating formation of a kind of novel close-graded, method of design, preparation method and application thereof, it is made to have more practicality.Through constantly research, design, and through repeatedly studying sample and after improving, finally creating the present invention had practical value.
Summary of the invention
Main purpose of the present invention is, overcome the defect of existing Asphalt Mixture Design and proportioning existence, and the method for design of the ultra-thin asphalt of mating formation of a kind of novel close-graded, preparation method and application thereof are provided, prolonging service life of pavement, thus be more suitable for practicality, and there is the utility value in industry.
The object of the invention to solve the technical problems realizes by the following technical solutions.The method of design of the ultra-thin asphalt of mating formation of a kind of close-graded proposed according to the present invention, the ultra-thin asphalt of mating formation of described close-graded is gathered materials by 87% ~ 95% mass parts, 5.1% ~ 5.5% mass parts SBS modifying asphalt, 0.3% ~ 0.5% mass parts composite synergistic properties-correcting agent form, and surplus is breeze; Gather materials for basalt or diabase, the composition that gathers materials adopts close-graded, nominal maximum aggregate size 10mm; Composite synergistic properties-correcting agent is low melting point multichain polyolefine, joins in asphalt in the mode delivered directly, with compound mix; Low melting point multichain polyolefine is for low-melting-point polyethylene wax, soft chain segment are greater than the thermoplastic polyolefin elastomer (TPO), polyethylene, polypropylene, styrenic (SBS, SIS, SEBS, SEPS etc.), poly(4-methyl-1-pentene) etc. that the rubber of 20% and the polyolefine of hard segment form.
Method of design comprises following operation steps,
(1) Design Air Voids is 5 ~ 7%;
(2) according to pave-load layer thickness, by temperature T at the bottom of layer after road pavement layer first pressing
1with modifying asphalt Heating temperature T
2, calculate compaction temperature T
3, wherein T
3=(T
1+ T
2)/2;
(3) according to design compaction temperature T
3and Design Air Voids, that determines asphalt estimates bitumen aggregate ratio P;
(4) the ultra-thin asphalt proportioning of mating formation of close-graded is carried out according to marshall' mechanic characteristic value.
Further, the method for design of the ultra-thin asphalt of mating formation of aforesaid close-graded, described pave-load layer thickness is 1.5 ~ 4cm.
The preparation method of the ultra-thin asphalt of mating formation of close-graded, comprises following operation steps,
(1) preheating is gathered materials, heating SBS modifying asphalt;
(2) by gathering materials and the mixing of SBS modifying asphalt after heating;
(3) in the mixture of (2), add breeze and composite synergistic properties-correcting agent, stir;
(4) at compaction temperature T
3under to carry out marshall compaction shaping, two-sidedly hit real 75 times, formation diameter is 101.6mm, is highly the cylinder specimen of 63.5 ± 1.3mm.
Further, the preparation method of the ultra-thin asphalt of mating formation of aforesaid close-graded, described in the preheating temperature of gathering materials be 190 DEG C ~ 210 DEG C,
Further, the preparation method of the ultra-thin asphalt of mating formation of aforesaid close-graded, the Heating temperature of described SBS modifying asphalt is 160 DEG C ~ 170 DEG C.
Further, the preparation method of the ultra-thin asphalt of mating formation of aforesaid close-graded, the temperature of mixing and stirring of described (3) is 160 ~ 170 DEG C.
The ultra-thin asphalt of mating formation of close-graded is applied to newly-builtly to mat formation in maintenance of surface, Deck curing, road surface, bridge floor is newly-built mats formation and the structural sheet on functional road surface, as the wearing course of longlife noodles bituminous pavement, the wearing course etc. of high-strength and high-modulus amount bituminous pavement.
The evaluation method of the ultra-thin asphalt of mating formation of close-graded, adopt the construction depth pad value k rolling position before and after 60 DEG C of dynamic stabilities, 70 DEG C of dynamic stabilities and 60 DEG C of wheel tracking tests to evaluate compound high-temperature behavior, judgement criteria comprises: construction depth pad value k≤0.2 of rolling position before and after 60 DEG C of dynamic stability >=8000 time/mm, 70 DEG C of dynamic stability >=3000 time/mm, 60 DEG C of wheel tracking tests.
By technique scheme, the method for design of the ultra-thin asphalt of mating formation of close-graded of the present invention, preparation method and application thereof at least have following advantages:
The ultra-thin Asphalt Mixture Design voidage of mating formation of close-graded provided by the invention is 5% ~ 7%, pavement thickness is generally 1.5 ~ 4cm, because the rate of temperature fall of compound under different pave-load layer thickness is different, therefore, the ultra-thin asphalt of mating formation of this close-graded is determined to design compaction temperature by pave-load layer thickness, and determines asphalt content thus.This material has the features such as high temperature Rut resistance is excellent, anti-water damage property is high, construction workability is good as ultra-thin pave-load layer, there is the effect of warm mix simultaneously, the more traditional modifying asphalt of construction temperature reduces by 10 ~ 15 DEG C, and the ultrathin asphalt pavement that making becomes simultaneously more former pavement noise reduces by 1 ~ 2 decibel; The ultra-thin asphalt of mating formation of this close-graded can be widely used in road surface, bridge floor rapid curing and new pavement, deck paving engineering, also can be used for the structural sheet on functional road surface, as the wearing course of longlife noodles bituminous pavement, the wearing course etc. of high-strength and high-modulus amount bituminous pavement, can prolonging service life of pavement, enhancing road surface allomeric function and raising road-ability.
Above-mentioned explanation is only the general introduction of technical solution of the present invention, in order to better understand technique means of the present invention, and can be implemented according to the content of specification sheets, be described in detail as follows below with preferred embodiment of the present invention.
Embodiment
For further setting forth the present invention for the technique means reaching predetermined goal of the invention and take and effect, to the method for design of the ultra-thin asphalt of mating formation of close-graded proposed according to the present invention, preparation method and its embodiment of application, feature and effect thereof, be described in detail as follows.
Because material of the present invention designs for ultra-thin paving structure layer, and the nominal maximum aggregate size gathered materials is 10mm, therefore the ultra-thin asphalt called after U-PAVE10 that mats formation of close-graded of the present invention.The composite synergistic properties-correcting agent related in this invention has following technical requirements, in table 1.
The technical indicator of table 1 composite synergistic properties-correcting agent
| Test item | Technical indicator |
| Drop point | 110～150℃ |
| Volume (%) | 0.3 ~ 0.4% of mineral aggregate quality |
The grading limit of the ultra-thin asphalt U-PAVE10 that mats formation of close-graded is as shown in table 2.
The grading limit of table 2U-PAVE10
| Sieve aperture mm | 13.2 | 9.5 | 4.75 | 2.36 | 1.18 | 0.6 | 0.3 | 0.15 | 0.075 |
| Percent of pass % | 100 | 90～100 | 40～54 | 20～36 | 16～30 | 10～24 | 7～20 | 6～12 | 4～8 |
Present invention also offers the preparation method of the ultra-thin asphalt of mating formation of a kind of close-graded, the method comprises preheating of gathering materials, preheating temperature is 190 DEG C ~ 210 DEG C, SBS modifying asphalt Heating temperature is at 160 DEG C ~ 170 DEG C, to gather materials in proportion and to mix with SBS modifying asphalt, then breeze is added, composite synergistic properties-correcting agent, 2min ~ 3min is stirred in the temperature range of mix temperature 160 ~ 170 DEG C, then under compaction temperature T3, marshall compaction is carried out shaping, two-sidedly hit real 75 times, formation diameter is 101.6mm, it is highly the cylinder specimen of 63.5 ± 1.3mm, shop experiment temperature is in table 3.
The shop experiment temperature (DEG C) of table 3U-PAVE10
| Mineral aggregate (comprising breeze) Heating temperature | 165～170 |
| Modifying asphalt Heating temperature | 160～170 |
| Asphalt mixes and stirs temperature | 155～165 |
| Die trial preheating temperature | 140～145 |
| Design compaction temperature | 130～140 |
| Specimen molding finishing temperature | Be not less than 120 |
Embodiment 1
What the present embodiment adopted gathers materials for basalt, and filler is limestone dust, and the grating of U-PAVE10 is as shown in table 4:
The grading limit of table 4U-PAVE10
| Sieve aperture mm | 13.2 | 9.5 | 4.75 | 2.36 | 1.18 | 0.6 | 0.3 | 0.15 | 0.075 |
| Percent of pass % | 100 | 99 | 53.2 | 33.5 | 22.4 | 16.0 | 11.3 | 9.3 | 7.5 |
The Heating temperature of SBS modifying asphalt is 160 DEG C, 0.35%, the SBS modifying asphalt that composite synergistic content of modifier accounts for compound total mass and the mass ratio gathered materials, namely bitumen aggregate ratio is 5.6%, 3min is stirred, then at design compaction temperature T under the condition of mix temperature 160 DEG C
3under to carry out marshall compaction shaping, two-sidedly hit real 75 times, formation diameter is 101.6mm, is highly the cylinder specimen of 63.5mm.Wherein, T
3deterministic process is as follows, if pave-load layer thickness is 2.5cm, then in roller compaction process, the medial temperature at the bottom of engineering detecting pave-load layer 120 DEG C, according to asphalt heating temperature 160 DEG C, then determines that compaction temperature is (120+160)/2=140 DEG C;
At 140 DEG C, carry out indoor shaping, last specimen molding finishing temperature is 135 DEG C.Through evaluating, U-PAVE10 performance is as follows:
The performance test results of table 5U-PAVE10
Embodiment 2
What the present embodiment adopted gathers materials for basalt, and filler is limestone dust, and the grating of U-PAVE10 is as shown in table 6:
The grading limit of table 6U-PAVE10
| Sieve aperture mm | 13.2 | 9.5 | 4.75 | 2.36 | 1.18 | 0.6 | 0.3 | 0.15 | 0.075 |
| Percent of pass % | 100 | 98 | 54.0 | 34.0 | 22.6 | 15.8 | 11.7 | 9.5 | 7.2 |
During preparation, the Heating temperature of SBS modifying asphalt is 160 DEG C, and composite synergistic content of modifier accounts for 0.4% of compound total mass, SBS modifying asphalt and the mass ratio gathered materials, namely bitumen aggregate ratio is 5.7%, in the temperature range of mix temperature 160 DEG C, stir 3min, then at design compaction temperature T
3under to carry out marshall compaction shaping, two-sidedly hit real 75 times, formation diameter is 101.6mm, is highly the cylinder specimen of 63.8mm.
Wherein, T
3deterministic process is as follows, if pave-load layer thickness is 1.5cm, then in roller compaction process, the medial temperature at the bottom of engineering detecting pave-load layer 100 DEG C, according to mix temperature 160 DEG C, then determines that compaction temperature is (100+160)/2=130 DEG C;
At 130 DEG C, carry out indoor shaping, last specimen molding finishing temperature is 125 DEG C.Through evaluating, U-PAVE10 performance is as shown in table 7:
The performance test results of table 7U-PAVE10
Embodiment 3
What adopt in the present embodiment gathers materials for diabase, and filler is limestone dust, and the grating of U-PAVE10 is as shown in table 8:
The grading limit of table 8U-PAVE10
| Sieve aperture mm | 13.2 | 9.5 | 4.75 | 2.36 | 1.18 | 0.6 | 0.3 | 0.15 | 0.075 |
| Percent of pass % | 100 | 99 | 54.6 | 33.8 | 23.0 | 16 | 12.4 | 9.6 | 7.4 |
During preparation, the Heating temperature of SBS modifying asphalt is 160 DEG C, and composite synergistic content of modifier accounts for 0.3% of compound total mass, SBS modifying asphalt and the mass ratio gathered materials, namely bitumen aggregate ratio is 5.5%, under the condition of mix temperature 165 DEG C, stir 3min, then at design compaction temperature T
3under to carry out marshall compaction shaping, two-sidedly hit real 75 times, formation diameter is 101.6mm, is highly the cylinder specimen of 63.9mm.
Wherein, T
3deterministic process is as follows, if pave-load layer thickness is 2.0cm, in roller compaction process, the medial temperature at the bottom of engineering detecting pave-load layer 110 DEG C, according to mix temperature 165 DEG C, then determines that compaction temperature is (110+165)/2=137.5 DEG C;
At 137.5 DEG C, carry out indoor shaping, last specimen molding finishing temperature is 131 DEG C.Through evaluating, the performance of U-PAVE10 is as shown in table 9:
The performance test results of table 9U-PAVE10
Present invention also offers the evaluation method of the ultra-thin asphalt of mating formation of a kind of close-graded, this evaluation method comprises: adopt the construction depth pad value k rolling position before and after 60 DEG C of dynamic stabilities, 70 DEG C of dynamic stabilities and 60 DEG C of wheel tracking tests to evaluate compound high-temperature behavior, judgement criteria is: construction depth pad value k≤0.2 of rolling position before and after 60 DEG C of dynamic stability >=8000 time/mm, 70 DEG C of dynamic stability >=3000 time/mm, 60 DEG C of wheel tracking tests.
The ultra-thin asphalt of mating formation of the close-graded of the present invention feature that to have that non-deformability is strong, high temperature rutting resistance is strong etc. good.The dynamic stability of asphalt at 60 DEG C of the preferred embodiment for the present invention can reach 12778 times/mm, the maximum flexural-tensile strain of low temperature at-10 DEG C reaches 2628 μ ε, anti-water damage property aspect, residual stability ratio reaches more than 90%, exceedes the requirement to modified asphalt mixture in corresponding specification.
The ultra-thin asphalt of mating formation of close-graded of the present invention can be widely used in the rapid curing of road surface, bridge floor, new pavement, deck paving engineering, also can be used for the structural sheet on functional road surface, as the wearing course of longlife noodles bituminous pavement, the wearing course etc. of high-strength and high-modulus amount bituminous pavement.
The above, it is only preferred embodiment of the present invention, not any pro forma restriction is done to the present invention, although the present invention discloses as above with preferred embodiment, but and be not used to limit the present invention, any those skilled in the art, do not departing within the scope of technical solution of the present invention, make a little change when the technology contents of above-mentioned announcement can be utilized or be modified to the Equivalent embodiments of equivalent variations, in every case be the content not departing from technical solution of the present invention, according to any simple modification that technical spirit of the present invention is done above embodiment, equivalent variations and modification, all still belong to the scope of technical solution of the present invention.
Claims (7)
1. the method for design of the ultra-thin asphalt of mating formation of close-graded, the ultra-thin asphalt of mating formation of described close-graded is gathered materials by 87% ~ 95% mass parts, 5.1% ~ 5.5% mass parts SBS modifying asphalt, 0.3% ~ 0.5% mass parts composite synergistic properties-correcting agent form, surplus is breeze, it is characterized in that: method of design comprises following operation steps
(1) Design Air Voids is 5 ~ 7%;
(2) according to pave-load layer thickness, by temperature T at the bottom of layer after road pavement layer first pressing
1with modifying asphalt Heating temperature T
2, calculate compaction temperature T
3, wherein T
3=(T
1+ T
2)/2;
(3) according to design compaction temperature T
3and Design Air Voids, that determines asphalt estimates bitumen aggregate ratio P;
(4) the ultra-thin asphalt proportioning of mating formation of close-graded is carried out according to marshall' mechanic characteristic value.
2. the method for design of the ultra-thin asphalt of mating formation of close-graded according to claim 1, is characterized in that: described pave-load layer thickness is 1.5 ~ 4cm.
3. the preparation method of the ultra-thin asphalt of mating formation of close-graded, is characterized in that: comprise following operation steps,
(1) preheating is gathered materials, heating SBS modifying asphalt;
(2) by gathering materials and the mixing of SBS modifying asphalt after heating;
(3) in the mixture of (2), add breeze and composite synergistic properties-correcting agent, stir;
(4) at compaction temperature T
3under to carry out marshall compaction shaping.
4. the preparation method of the ultra-thin asphalt of mating formation of close-graded according to claim 3, is characterized in that: described in the preheating temperature of gathering materials be 190 DEG C ~ 210 DEG C.
5. the preparation method of the ultra-thin asphalt of mating formation of close-graded according to claim 3, is characterized in that: the Heating temperature of described SBS modifying asphalt is 160 DEG C ~ 170 DEG C.
6. the preparation method of the ultra-thin asphalt of mating formation of close-graded according to claim 3, is characterized in that: the temperature of mixing and stirring of described (3) is 160 ~ 170 DEG C.
7. the ultra-thin asphalt of mating formation of close-graded is applied to newly-builtly to mat formation in maintenance of surface, Deck curing, road surface, bridge floor is newly-built mats formation and the structural sheet on functional road surface.
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