CN109293281A - A kind of modified asphalt mixture and preparation method thereof - Google Patents
A kind of modified asphalt mixture and preparation method thereof Download PDFInfo
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- CN109293281A CN109293281A CN201811225284.9A CN201811225284A CN109293281A CN 109293281 A CN109293281 A CN 109293281A CN 201811225284 A CN201811225284 A CN 201811225284A CN 109293281 A CN109293281 A CN 109293281A
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B26/00—Compositions of mortars, concrete or artificial stone, containing only organic binders, e.g. polymer or resin concrete
- C04B26/02—Macromolecular compounds
- C04B26/26—Bituminous materials, e.g. tar, pitch
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
- C04B2201/50—Mortars, concrete or artificial stone characterised by specific physical values for the mechanical strength
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Abstract
The invention discloses a kind of modified asphalt mixtures and preparation method thereof.A kind of modified asphalt mixture is made of the raw material comprising following parts by weight: 6~15 parts of modified pitch, 95~120 parts gather materials, 18~30 parts of filler, 3~7 parts of warm-mixing agent and 0.5~3 part of auxiliary agent.Preparation method are as follows: weigh each material according to formula rate, with auxiliary agent mixing dry mixing after the preheating that will gather materials, add modified pitch and warm-mixing agent, add filler after uniform mixing and mix and stir.Modified asphalt mixture prepared by the present invention, have the advantages that structure is closely knit, anti-pressure ability is strong, it is not easy to crack, be readily transported and construct, in addition, preparation method of the invention have the advantages that it is low to temperature requirement.
Description
Technical field
The present invention relates to highway engineering technical fields, more specifically, it relates to a kind of modified asphalt mixture and its system
Preparation Method.
Background technique
With the fast development of highway in China road construction, the connection between each city is strengthened, is also promoted differently
The cultural exchanges in domain, but along with Heavy Traffic increase and the raising of vehicle tire air pressure, automobile quantity increase pair rapidly
Highway road construction proposes requirements at the higher level.Bituminous pavement refers to mixes the various types of of bitumen for road use material making in mineral material
The road surface of type, asphalt, which improves to pave the way, resists the ability of driving and the damage of natural cause road pavement with pellet, makes road surface
It is smooth few dirt, waterproof, durable.Currently used bituminous pavement be asphalt is paved, roller-compaction and
The various types of road surfaces formed, asphalt are with the asphalt material and certain gradation with certain viscosity and appropriate dosage
Mineral aggregate, by sufficiently mixing the mixture to be formed.But there is also a variety of diseases such as cracking, passage, track for bituminous pavement
Evil, especially with heavy vehicle increase and the overload operation of vehicle and be on the rise.
In the prior art, notification number is that the Chinese patent of CN108249825A discloses a kind of preparation side of asphalt
Method and asphalt, the pitch used, rubber, water-soluble silicate, haydite, perlite, slag and river sand, by upper
It states material and carries out four hot melts, be mixed at 170~185 DEG C, obtain asphalt.By in asphalt
Between preparation step add rubber, improve the uniformity coefficient and comprehensive performance of asphalt, enhance asphalt after paving
Anti-crack ability.But the pitch that rubber is added has very high viscosity, and mixture requires heat to very high in the construction process
Temperature, to asphalt mixing, transport and roll and all bring many problems, construction cost is high, especially in High aititude mountain area
Transportation range farther out, the universal lower place of environment temperature, the temperature of asphalt in mixing, transport, roll etc. under links
Drop it is too fast, to make the limitation of pavement construction reinforce, claim for eot, while heated asphalt and mineral aggregate will also consume a large amount of energy
Source increases the generation of the exhaust gas, dust particles in production and work progress, is unfavorable for environmental protection.
Summary of the invention
In view of the deficienciess of the prior art, the first purpose of this invention is to provide a kind of modified asphalt mixture,
It has the advantages that mix and stir that temperature is low, structure is closely knit, anti-pressure ability is strong, not easy to crack.
Second object of the present invention is to provide a kind of preparation method of modified asphalt mixture, with method letter
Single, the low advantage of temperature requirement.
To realize above-mentioned first purpose, the present invention provides the following technical scheme that a kind of modified asphalt mixture, described
Mixture is made of the raw material comprising following parts by weight: 6~15 parts of modified pitch, 95~120 parts gather materials, 18~30 parts
Filler, 3~7 parts of warm-mixing agent and 0.5~3 part of auxiliary agent.
The modified pitch includes matrix pitch and modifying agent, and the modifying agent includes high density polyethylene (HDPE), ethyl vinyl acetate
At least one of ethylene copolymer and styrene series thermoplastic elastomer.
It is described to gather materials including at least one of rubble, expanded perlite and haydite.
The filler includes at least one of miberal powder, calcium hydroxide and sand.
The auxiliary agent includes at least two in antistripping agent, age resister and stabilizer.
By using above-mentioned technical proposal, gather materials, the mixing of filler and modified pitch during be added warm-mixing agent and
The auxiliary agents such as antistripping agent, age resister, stabilizer, Multiple components cooperate, and effectively reduce asphalt mixes and stirs temperature
Degree reduces the problems such as asphalt is laid with the crack on road surface, track.Modified pitch is to utilize high density polyethylene (HDPE), ethylene-vinegar
Sour ethylene copolymer or styrene series thermoplastic elastomer etc. are modified pitch, and styrene series thermoplastic elastomer mainly wraps
Block copolymer of the styrene respectively with butadiene, isoprene, Ethylene/Butylene and ethylene-propylene is included, is modified material using these
Material makes modified pitch have good high temperature stability performance and elastic recovery capability, is combined with to be conducive to improve with warm-mixing agent and gather materials
Caking property between modified pitch.In the molecular structure of warm-mixing agent, containing lipophilic group and hydrophilic group, during mixing and stirring,
The moisture that contains in asphalt is reduced, remaining moisture in conjunction with the hydrophilic group of warm-mixing agent, the lipophilic group of warm-mixing agent with change
Property pitch combine, such warm-mixing agent forms the structural moisture film with lubricating function between asphalt, is conducive to improve and drips
The mixing and stirring property of green mixture, reduce asphalt mixes and stirs temperature.Meanwhile warm-mixing agent improves the easy compacting of asphalt
Property, after structure moisture film scatters and disappears with hydrone, warm-mixing agent concentrates on modified pitch and is modified on the boundary that gathers materials, being conducive to improve
Caking property between asphalt and aggregate advantageously reduces cracking, passage problem that bituminous pavement occurs.
Further, the mixture is made of the raw material comprising following parts by weight: 8~10 parts of modified pitch, 100~
110 parts gather materials, 20~35 parts of filler, 3~5 parts of warm-mixing agent, 0.2~0.5 part of antistripping agent and 0.5~1.5 part
Stabilizer.
Gather materials also known as aggregate, different according to the partial size of raw material, can be divided into coarse aggregate and fine aggregate, be risen in asphalt
The ingredient of skeleton function.Expanded perlite is a kind of natural glass matter slag, including perlite, pitchstone and obsidian,
With good high insulating efficiency and superpower stability, be conducive to the structural stability of modified asphalt mixture.Haydite is ceramic
Particle, surface is hard ceramic or enamel shell, and inside is in fine and closely woven honeycomb structure, has that lightweight, intensity be high, corrosion resistant
The characteristics of erosion, is conducive to the weight for mitigating asphalt.Rubble is exactly broken stone, and further, the rubble includes
At least one of basaltic broken stone, quartzite rubble, diabase rubble.Basalt is a kind of mafic effusive rock, mainly by base
Property feldspar and pyroxene composition, have crushing resistance is strong, crush values are low, corrosion resistance is strong, the good advantage with the adhesive attraction of pitch, fit
Cooperation is gathering materials for asphalt.Quartzite is a kind of metamorphic rock being mainly made of quartz, has hardness height, particle thin
The characteristics of greasy, close structure, there is fabulous heat-resisting quantity, is conducive to the skeleton function that enhancing is gathered materials.Diabase is mainly by plagioclase
Stone and one or more of melanocratic mineral compositions, compression strength is good, and corrosion resistance is strong, is conducive to improve the anti-of modified asphalt mixture
Pressure, corrosion resistance.
Further, the material that middle partial size is 0~5mm that gathers materials accounts for the 25~35% of total amount of gathering materials, and partial size is 5~
The material of 10mm accounts for the 20~25% of total amount of gathering materials, and partial size is that the material of 10~15mm accounts for the 26~35% of total amount of gathering materials, partial size
The 8~15% of total amount of gathering materials is accounted for for the material of 15~20mm.
By using above-mentioned technical proposal, gather materials has preferable compactness and mix in above-mentioned grading limit, has
Conducive to gather materials, the capability and performance of the mixing of filler and modified pitch and modified asphalt mixture.
Filler refers to the material being filled in other objects, refers mainly to be filled in the skeleton that gathers materials in asphalt
In, the materials such as the lesser sandstone miberal powder of partial size.Miberal powder is the general designation for meeting the mountain flour and its substitute of engine request, and mountain flour is main
It is the product after ore crushing and processing, substitute includes ground granulated blast furnace slag, and miberal powder is added in asphalt, is conducive to
Its mechanical property is improved, the preparation cost of asphalt is reduced, improves its compactness, impervious and erosion-resistant ability.Niter
Ash is calcium hydroxide, can effectively improve the water stability of modified asphalt mixture as filler using calcium hydroxide, it is resistance to improve its
High-temperature behavior, low-temperature cracking-resistance and anti-fatigue performance.Sand is the particle for polishing to get off from stone or made dioxy
Silicon carbide particle can improve the density and intensity of asphalt.
Antistripping agent is to form physical absorption with surface of aggregate or make itself and progress of gathering materials by its special chemical structure
Combination reaction, and then strong chemical tie is formed, improve the auxiliary agent of the adhesiveness between asphalt and aggregate, it is predominantly fatty
Amine, amido amine and imidazoles woods are conducive to enhance modified pitch and adhesion strength and anti-water damage intensity between gathering materials, be conducive to
Extend the service life of bituminous pavement.Age resister can improve modified asphalt mixture heat resistanceheat resistant, oxygen, photooxidation aging property, favorably
In the anti-fatigue performance for improving modified asphalt mixture.Stabilizer is addition in asphalt, to improve asphalt
In production, the cellulose for transporting, paving with uniformity and stability in roller compaction process, the cellulose used here can be wood
Quality fiber, polymer fiber or mineral fibres.Further, the stabilizer includes that sepiolite fibre and polyvinyl alcohol are fine
The mass ratio of dimension, the sepiolite fibre and vinal is 1:(2~3).Sepiolite fibre is natural mineral fibres,
With high heat resistanceheat resistant performance and acid resistance, there are good colloid rheological characteristic, stability and adsorptivity, can match with warm-mixing agent
It closes and promotes sepiolite fibre being uniformly distributed between asphalt and aggregate, be conducive to improve the peptizaiton to pitch and filler.
Vinal is using the polyvinyl alcohol of high polymerization degree as raw material, and the synthetic fibers being process by particular technology have
The advantages of intensity height, high, wear-resisting, the antiacid alkali of modulus, good weatherability, there are good dispersibility, sepiolite fibre and polyvinyl alcohol
Fiber cooperation, be conducive to improve to modified pitch and gather materials between cementation, prevent and inhibit the formation and development in crack,
Its impact resistance is improved, and then improves the durability of bituminous pavement.
Further, the modifying agent includes high density polyethylene (HDPE) and ethylene-vinyl acetate copolymer, and the high density is poly-
The mass ratio of ethylene and ethene-vinyl acetate is 1:(1.5~3), the additive amount of the modifying agent be matrix pitch quality 4~
6%.
By using above-mentioned technical proposal, using high density polyethylene (HDPE) and ethylene-vinyl acetate copolymer according to above-mentioned ratio
The modifying agent of example mixing, not only improves high-temperature stability, water stability and the low-temperature cracking-resistance for improving modified pitch, and can be with temperature
It mixes agent cooperation enhancing modified pitch and gathers materials, the easy mix between filler, improve the comprehensive performance of modified asphalt mixture.
Further, the mass ratio of the modified pitch, warm-mixing agent and stabilizer is (2~3): 1:(0.3~0.5).
By using above-mentioned technical proposal, modified pitch, warm-mixing agent and stabilizer cooperate, modified modified pitch
There is good binding force between warm-mixing agent, is conducive to the function and effect for improving warm-mixing agent.Meanwhile stabilizer can promote warm mix
The uniformity that agent is distributed in asphalt is conducive to improve modification under the effect of the coordinated of warm-mixing agent and stabilizer
Cementation between asphalt and aggregate improves the impact resistance and durability of Modified Bitumen Pavement.
To realize above-mentioned second purpose, the present invention provides the following technical scheme that a kind of system of modified asphalt mixture
Preparation Method, comprising the following steps:
Step 1: weighing each material according to formula rate, will gather materials and is preheated to 140~145 DEG C, and 15~25s of auxiliary agent dry mixing is added,
Obtain dry mix.
Step 2: modified pitch and warm-mixing agent being added into dry mix, mix and stir 150 at 140~150 DEG C~
210s adds filler, obtains asphalt after mixing and stirring 4~6min.
It by using above-mentioned technical proposal, will first gather materials, filler is uniformly mixed with auxiliary agent, and add modified pitch and warm mix
Agent, stabilizer promote warm-mixing agent evenly dispersed in mixture, and warm-mixing agent is formed in modified pitch and between gathering materials has profit
The structural moisture film of sliding function, improves the easy mix of mixture, and reduce modified asphalt mixture mixes and stirs temperature and construction temperature
Degree is conducive to the comprehensive performance for improving modified asphalt mixture under the mating reaction of a variety of auxiliary agents and warm-mixing agent.
Further, the modified pitch is prepared as follows: matrix pitch being preheated to 160~165 DEG C, Xiang Ji
Modifying agent is added in matter pitch, 10~15min is kept at 160~170 DEG C, the mixture of matrix pitch and modifying agent is carried out
High speed shear, shear velocity 4000rpm, shear time is 0.8~1.5h, up to modified pitch after the completion of shearing.
In conclusion the invention has the following advantages:
One, it is acted on due to the present invention using warm-mixing agent, stabilizer and modified pitch, collaboration improves the mix of modified asphalt mixture
Property and stability, the mixing and stirring of modified asphalt mixture, construction temperature can be substantially reduced, improve modified pitch and gather materials between
Cementation power is conducive to eliminate higher temperature to the limitation of modified asphalt mixture preparation, transport and construction, is also beneficial to
Improve the crack resistance and resistance to ag(e)ing of bituminous pavement.
Two, the present invention in preferably using basaltic broken stone, quartzite rubble, diabase rubble or expanded perlite rubble,
Haydite etc. is conducive to the structural strength and compressive property that improve modified asphalt mixture as gathering materials, meanwhile, gathered materials by limiting
Grading limit, be conducive to improve modified asphalt mixture compactness, improve its mechanical property.
Three, in the present invention preferably using sepiolite fibre and vinal as stabilizer, high density polyethylene (HDPE) and
Ethene-vinyl acetate is modifying agent, and limits the usage ratio of modifying agent and matrix pitch, stabilizer, warm-mixing agent and modified drip
Green usage ratio range is conducive to improve the compounding synergy between various ingredients, and then it is mixed to be conducive to raising modified pitch
Close the comprehensive performance of material.
Specific embodiment
Invention is further described in detail with reference to embodiments.
The preparation example of modified pitch
Preparation example 1
The matrix pitch of 15kg is preheated to 160 DEG C, the high density polyethylene (HDPE) of 0.6kg is added into matrix pitch, at 160 DEG C
15min is kept, high speed shear, shear velocity 4000rpm, shearing are carried out to the mixture of matrix pitch and high density polyethylene (HDPE)
Time is 1.5h, up to modified pitch after the completion of shearing.
Preparation example 2
The matrix pitch of 10kg is preheated to 165 DEG C, the s-B-S that 0.6kg is added into matrix pitch is embedding
Section copolymer, keeps 10min at 170 DEG C, the mixing to matrix pitch and Styrene-Butadiene-Styrene Block Copolymer
Object carries out high speed shear, shear velocity 4000rpm, shear time 0.8h, up to modified pitch after the completion of shearing.
Preparation example 3
The matrix pitch of 10kg is preheated to 163 DEG C, the high density polyethylene (HDPE) and 0.35kg of 0.15kg are added into matrix pitch
Ethylene-vinyl acetate copolymer, 12min is kept at 165 DEG C, to matrix pitch and s-B-S block
The mixture of copolymer carries out high speed shear, and shear velocity 4000rpm, shear time 1.2h change to obtain the final product after the completion of shearing
Property pitch.
The pitch used in the various embodiments described above is No. 90 pitches.
Embodiment
Embodiment 1
The present embodiment provides a kind of preparation methods of modified asphalt mixture, comprising the following steps:
Step 1: 6kg modified pitch, the basaltic broken stone of 60kg, the expanded perlite of 35kg, the miberal powder of 13kg, 5kg are weighed
Calcium hydroxide, the warm-mixing agent of 3kg, the sepiolite fibre of 0.2kg and 0.3kg vinal.Wherein, basaltic broken stone and swollen
The mixture of swollen perlite is sieved jointly, and the sieve percent of pass that screen size is 4.75mm is 27.6%, screen size 9.5mm
Sieve percent of pass be 50.8%, the sieve percent of pass that screen size is 13.2mm is 85.2%, screen size be 19mm sieve
Net percent of pass is 100%.Basaltic broken stone and expanded perlite are preheated to 140 DEG C, sepiolite fibre and polyvinyl alcohol is added
Fiber dry mixing 25s, obtains dry mix.
Step 2: modified pitch and warm-mixing agent are added into the dry mix that step 1 obtains, is mixed and stirred at 140 DEG C
210s adds miberal powder and calcium hydroxide, obtains asphalt after mixing and stirring 6min.The modified pitch that the present embodiment uses is preparation
What example 1 obtained, for the miberal powder that the present embodiment uses for ground granulated blast furnace slag, the warm-mixing agent that the present embodiment uses inspires confidence in material for upper sea otter
EWMA warm-mixed asphalt additive, other materials are ordinary commercial products.
Embodiment 2
The present embodiment and the difference of embodiment 1 essentially consist in: the preparation method of the modified asphalt mixture of the present embodiment include with
Lower step: the diabase of 8kg modified pitch, the basaltic broken stone of 50kg, the quartzite rubble of 30kg, 20kg step 1: are weighed
Rubble, the miberal powder of 15kg, the calcium hydroxide of 5kg, the warm-mixing agent of 6kg, the antistripping agent of 0.2kg, 0.15kg sepiolite fibre and
The vinal of 0.35kg.Wherein, the mixture of basaltic broken stone, quartzite rubble and diabase rubble is sieved jointly,
The sieve percent of pass that screen size is 4.75mm is 33.8%, and the sieve percent of pass that screen size is 9.5mm is 54.3%, sieve pore
Sieve percent of pass having a size of 13.2mm is 87.5%, and the sieve percent of pass that screen size is 19mm is 100%.Basalt is broken
Stone, quartzite rubble and diabase rubble are preheated to 145 DEG C, and it is dry that antistripping agent, sepiolite fibre and vinal is added
15s is mixed, dry mix is obtained.
Step 2: modified pitch and warm-mixing agent are added into the dry mix that step 1 obtains, is mixed and stirred at 150 DEG C
150s adds miberal powder and calcium hydroxide, obtains asphalt after mixing and stirring 4min.The modified pitch that the present embodiment uses is preparation
What example 2 obtained, the antistripping agent that the present embodiment uses is the YH-KBL antistripping agent of rhythm Hai Jialu.
Embodiment 3
The present embodiment and the difference of comparative example 1 essentially consist in: the preparation method of the modified asphalt mixture of the present embodiment include with
Lower step: the diabase of 9kg modified pitch, the basaltic broken stone of 60kg, the quartzite rubble of 30kg, 15kg step 1: are weighed
The sea of rubble, the miberal powder of 15kg, the calcium hydroxide of 5kg, the sand of 5kg, the warm-mixing agent of 4kg, the antistripping agent of 0.3kg, 0.35kg
The vinal of afrodite fiber and 0.85kg.Wherein, the mixture of basaltic broken stone, quartzite rubble and diabase rubble
Common sieving, the sieve percent of pass that screen size is 4.75mm is 31.7%, and the sieve percent of pass that screen size is 9.5mm is
55.9%, the sieve percent of pass that screen size is 13.2mm is 88.6%, and the sieve percent of pass that screen size is 19mm is
100%.Basaltic broken stone, quartzite rubble and diabase rubble are preheated to 143 DEG C, antistripping agent, sepiolite fibre is added
With vinal dry mixing 20s, dry mix is obtained.
Step 2: modified pitch and warm-mixing agent are added into the dry mix that step 1 obtains, is mixed and stirred at 145 DEG C
180s adds miberal powder and calcium hydroxide, obtains asphalt after mixing and stirring 5min.The modified pitch that the present embodiment uses is preparation
What example 3 obtained, the antistripping agent that the present embodiment uses is the YH-KBL antistripping agent of rhythm Hai Jialu.
Embodiment 4
The present embodiment and the difference of embodiment 3 essentially consist in: the raw material that the modified asphalt mixture of the present embodiment uses is by 10kg
Modified pitch, the basaltic broken stone of 65kg, the quartzite rubble of 30kg, the diabase rubble of 15kg, the miberal powder of 22kg, 8kg
Calcium hydroxide, the warm-mixing agent of 5kg, the antistripping agent of 0.5kg, the sepiolite fibre of 0.5kg and 1kg vinal composition.
Wherein, the mixture of basaltic broken stone, quartzite rubble and diabase rubble is sieved jointly, and screen size is the sieve of 4.75mm
Percent of pass is 32.4%, and the sieve percent of pass that screen size is 9.5mm is 56.3%, and screen size is that the sieve of 13.2mm passes through
Rate is 86.8%, and the sieve percent of pass that screen size is 19mm is 100%.
Embodiment 5
The present embodiment and the difference of embodiment 3 essentially consist in: the raw material that the modified asphalt mixture of the present embodiment uses is by 15kg
Modified pitch, the quartzite rubble of 70kg, the haydite of 50kg, the sand of 25kg, the calcium hydroxide of 10kg, 7kg warm-mixing agent,
The antistripping agent of 0.5kg, the age resister of 1kg, the sepiolite fibre of 0.8kg and 0.7kg vinal composition.Its
In, the mixture of quartzite rubble and haydite is sieved jointly, and the sieve percent of pass that screen size is 4.75mm is 30.9%, sieve pore
Sieve percent of pass having a size of 9.5mm is 53.6%, and the sieve percent of pass that screen size is 13.2mm is 85.2%, screen size
It is 100% for the sieve percent of pass of 19mm.The age resister that the present embodiment uses is age resister GW-944.
Comparative example
Comparative example 1
The main distinction of this comparative example and embodiment 1 is: in the modified asphalt mixture of this comparative example, not adding warm-mixing agent.
Comparative example 2
The difference of this comparative example and embodiment 1 essentially consists in: in the modified asphalt mixture of this comparative example, not adding sepiolite fibre
Dimension.
Comparative example 3
The difference of this comparative example and embodiment 1 essentially consists in: in the asphalt of this comparative example, using unmodified common drip
It is green.Performance detection test
According to " highway engineering pitch and Asphalt Mixture Experiment regulation " (JTJ052-2000) to embodiment 1 to 5 and comparison
The pitch and asphalt obtained that example 1 to 3 uses are detected, and testing result is as shown in table 1.
The modified pitch and performance of asphalt mixture testing result of each embodiment and comparative example of table 1
| Group | Softening point/DEG C | Voidage/% | Void in mineral aggregate/% | Pitch saturation degree/% | Marshall stability/kN |
| Embodiment 1 | 55 | 4.8 | 17.4 | 65.3 | 8.1 |
| Embodiment 2 | 58 | 4.5 | 16.3 | 66.4 | 8.4 |
| Embodiment 3 | 67 | 3.4 | 13.5 | 73.8 | 9.6 |
| Embodiment 4 | 62 | 4.2 | 15.8 | 68.4 | 9.1 |
| Embodiment 5 | 53 | 4.6 | 16.9 | 65.7 | 7.6 |
| Comparative example 1 | 50 | 6.3 | 22.5 | 54.7 | 6.2 |
| Comparative example 2 | 48 | 5.5 | 19.7 | 56.8 | 5.9 |
| Comparative example 3 | 41 | 4.5 | 21.4 | 53.7 | 6.5 |
Seen from table 1, the performance test results of each embodiment meet relevant criterion, and comparative example 1 is being not added with warm-mixing agent
In the case where, it is poor that asphalt made from whipping temp mixes and stirs effect, and void in mineral aggregate and pitch saturation degree fail full
Sufficient standard requirements；Comparative example 2 is not added with the asphalt of sepiolite fibre, and material mixing uniformity is poor, the gap measured
Rate is larger, and Marshall stability is too small；Comparative example 3 is using unmodified plain asphalt, plain asphalt and warm-mixing agent, stabilization
The interaction of agent is relatively poor, and more each embodiment difference of performance test results is obvious.
Pitch made from each embodiment and comparative example is mixed according to " asphalt mixture in track test " (T0719-1993)
Material dynamic stability is detected, and testing conditions are 60 ± 1 DEG C, examination wheel 0.7 ± 0.05MPa of pressure；According to " pitch and pitch mixing
Material testing regulations " (T0729-2000) detect the water stability of asphalt made from each embodiment and comparative example.
Testing result is as shown in table 2.
The dynamic stability and water stability testing result of each embodiment and comparative example of table 2
As can be seen from Table 2, the dynamic stability and water stability of each embodiment are significantly better than that the pitch of each comparative example preparation is mixed
Material is closed, the diseases such as track can be effectively reduced.Wherein, the dynamic stability and water stability of embodiment 2 to 4 are better than 1 He of embodiment
5, it was demonstrated that the usage ratio of sepiolite fibre and vinal is in 1:(2~3) when in range, stabilizer is mixed to modified pitch
The stabilization for closing material is best.The dynamic stability and water stability of embodiment 3 and 4 are better than embodiment 2, it was demonstrated that modified pitch, temperature
The amount ratio of agent and stabilizer is mixed in (2~3): 1:(0.3~0.5) compounding effect in range is more preferable.The dynamic stability of embodiment 3
Degree and water stability are also advantageous over embodiment 4, it was demonstrated that and modifying agent uses high density polyethylene (HDPE) and ethylene-vinyl acetate copolymer, and
The two dosage is in 1:(1.5~3) in range when, the compounding effect of modified pitch and warm-mixing agent, stabilizer is more preferable.The present invention passes through
To asphalt modification, and warm-mixing agent and stabilizer is added, in the case where reducing modified asphalt mixture preparation temperature, is successfully made
Structure is closely knit, anti-pressure ability is strong, is not likely to produce the durable asphalt road surface of disease.
This specific embodiment is only explanation of the invention, is not limitation of the present invention, those skilled in the art
Member can according to need the modification that not creative contribution is made to the present embodiment after reading this specification, but as long as at this
All by the protection of Patent Law in the scope of the claims of invention.
Claims (10)
1. a kind of modified asphalt mixture, which is characterized in that the mixture is made of the raw material comprising following parts by weight: 6~
15 parts of modified pitch, 95~120 parts gather materials, 18~30 parts of filler, 3~7 parts of warm-mixing agent and 0.5~3 part of auxiliary agent；
The modified pitch includes matrix pitch and modifying agent, and the modifying agent includes high density polyethylene (HDPE), ethene-vinyl acetate
At least one of copolymer and styrene series thermoplastic elastomer；
It is described to gather materials including at least one of rubble, expanded perlite and haydite；
The filler includes at least one of miberal powder, calcium hydroxide and sand；
The auxiliary agent includes at least two in antistripping agent, age resister and stabilizer.
2. a kind of modified asphalt mixture according to claim 1, which is characterized in that the mixture is by comprising following heavy
The raw material of amount part is made: 8~10 parts of modified pitch, 100~110 parts gather materials, 20~35 parts of filler, 3~5 parts of warm mix
Agent, 0.2~0.5 part of antistripping agent and 0.5~1.5 part of stabilizer.
3. a kind of modified asphalt mixture according to claim 1, which is characterized in that the rubble includes that basalt is broken
At least one of stone, quartzite rubble, diabase rubble.
4. a kind of modified asphalt mixture according to claim 1, which is characterized in that the middle partial size that gathers materials is 0~5mm
Material account for the 25~35% of total amount of gathering materials, partial size is that the material of 5~10mm accounts for the 20~25% of total amount of gathering materials, partial size is 10~
The material of 15mm accounts for the 26~35% of total amount of gathering materials, and partial size is that the material of 15~20mm accounts for the 8~15% of total amount of gathering materials.
5. a kind of modified asphalt mixture according to claim 1, which is characterized in that the stabilizer includes sepiolite fibre
The mass ratio of peacekeeping vinal, the sepiolite fibre and vinal is 1:(2~3).
6. a kind of modified asphalt mixture according to claim 1, which is characterized in that the modifying agent includes that high density is poly-
The mass ratio of ethylene and ethylene-vinyl acetate copolymer, the high density polyethylene (HDPE) and ethene-vinyl acetate be 1:(1.5~
3)。
7. a kind of modified asphalt mixture according to claim 1, which is characterized in that the additive amount of the modifying agent is base
The 4~6% of matter asphalt quality.
8. a kind of modified asphalt mixture according to claim 1, which is characterized in that the modified pitch, warm-mixing agent and
The mass ratio of stabilizer is (2~3): 1:(0.3~0.5).
9. a kind of preparation method of any modified asphalt mixture of claim 1-8, which is characterized in that including following step
It is rapid:
Step 1: weighing each material according to formula rate, will gather materials and is preheated to 140~145 DEG C, and 15~25s of auxiliary agent dry mixing is added,
Obtain dry mix；
Step 2: modified pitch and warm-mixing agent being added into dry mix, 150~210s is mixed and stirred at 140~150 DEG C, then
Filler is added, obtains asphalt after mixing and stirring 4~6min.
10. a kind of preparation method of modified asphalt mixture as claimed in claim 9, which is characterized in that the modified pitch is pressed
It is prepared according to following method: matrix pitch being preheated to 160~165 DEG C, modifying agent is added into matrix pitch, at 160~170 DEG C
10~15min of lower holding carries out high speed shear, shear velocity 4000rpm, shearing to the mixture of matrix pitch and modifying agent
Time is 0.8~1.5h, up to modified pitch after the completion of shearing.
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| CN109293281B (en) | 2021-09-14 |
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