CN110079104A - A kind of composite modified asphalt method promoting rock asphalt cryogenic property - Google Patents
A kind of composite modified asphalt method promoting rock asphalt cryogenic property Download PDFInfo
- Publication number
- CN110079104A CN110079104A CN201910312888.5A CN201910312888A CN110079104A CN 110079104 A CN110079104 A CN 110079104A CN 201910312888 A CN201910312888 A CN 201910312888A CN 110079104 A CN110079104 A CN 110079104A
- Authority
- CN
- China
- Prior art keywords
- asphalt
- bra
- composite modified
- sbr
- pitch
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Classifications
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L95/00—Compositions of bituminous materials, e.g. asphalt, tar, pitch
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2205/00—Polymer mixtures characterised by other features
- C08L2205/02—Polymer mixtures characterised by other features containing two or more polymers of the same C08L -group
- C08L2205/025—Polymer mixtures characterised by other features containing two or more polymers of the same C08L -group containing two or more polymers of the same hierarchy C08L, and differing only in parameters such as density, comonomer content, molecular weight, structure
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2205/00—Polymer mixtures characterised by other features
- C08L2205/03—Polymer mixtures characterised by other features containing three or more polymers in a blend
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Civil Engineering (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Health & Medical Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
- Organic Chemistry (AREA)
- Compositions Of Macromolecular Compounds (AREA)
- Road Paving Structures (AREA)
Abstract
The invention belongs to asphalt modifier technical fields, disclose a kind of composite modified asphalt method for promoting rock asphalt cryogenic property；The ratio of BRA and matrix pitch is 0.2:1 in BUTON rock asphalt BRA and SBR latex composite modified asphalt；70 matrix pitch of A grade is put into baking oven, temperature control is heated to all sufficiently fusing at 150 DEG C, and the BUTON rock asphalt BRA of corresponding proportion is dried and is added, and sequentially adds the SBR latex that volume is matrix pitch quality 3%~5%.The present invention can improve rock asphalt cryogenic property.Specific method: the butadiene-styrene rubber (SBR) of different conditions different addition quantity is added in BUTON rock asphalt (BRA), then the traditional performance of the SBR latex composite modified asphalt of different addition quantity is compared and analyzed, the optimum state and volume for determining SBR, the method for determining specifically modified rock asphalt cryogenic property.
Description
Technical field
The invention belongs to asphalt modifier technical field more particularly to it is a kind of promoted rock asphalt cryogenic property it is composite modified
Pitch method.
Background technique
Currently, the immediate prior art: asphalt modifier is wide in variety and miscellaneous, and the measure of asphalt modification is also a variety of more
Sample, the effect that different modifying agent generate is multifarious, and the effect under same modifying agent different addition quantity also has very big difference.It is many
Road engineering case shows the earlier period damage of express highway pavement, after excluding some human factors, the physics of asphalt
Mechanical property is bad to be one and cannot be neglected first cause.Many traditional modified pitch means and method are not able to satisfy existing
The requirement of road technique in road finds new modified pitch methods and techniques measure, enriches existing modifying agent or modified pitch
Kind is one of goal in research of road worker.
With modified pitch improve Asphalt Mixture Performance technical measures carry out already, such as SBS, SBR, PE,
Lignin fibre, lake asphalt and rock asphalt etc..In numerous modifying agent, natural rock asphalt and matrix pitch possess well
Blending also has many advantages, such as production is convenient at the same time, is increasingly subject to the favor of road worker.
Natural rock asphalt is a kind of drip with good stability for being influenced transformation generation by a variety of environment in nature
Blueness, it and matrix pitch possess good intersolubility, natural rock asphalt are used as modifying agent, for can effectively change in road engineering
The pavement performance of kind matrix pitch.Natural rock asphalt is mostly distributed in the stratum closer from earth's surface, is exploited and is easy quick, valence
Lattice are cheap, since their most classes are solid-likes, in use process easy processing at powdery granule, little particle after processing with
Asphalt possesses good intermiscibility, and create it has excellent compatibility characteristic between matrix pitch.It is processed with them
Generate modified pitch method it is simple and fast, extra cost is low, only need to be directly thrown under certain condition mix in storehouse with pitch
Mixture stirring can, greatly simplifie modified technique and working measure, the cost of investment of engineering can be effectively reduced.Due to changing
Property pitch homeostasis characteristic, exploitation, production, storage, transport and with etc. it is many-sided simple to operation.
Natural rock asphalt has the advantage in certain performances, it possesses very strong dipped type to matrix pitch and drips to matrix
The extremely strong resistivity of free oxidation base in blueness, especially it and gather materials after combination so that adhesiveness between the two obtains
Greatly enhancing, the peeling resistance of the modified aggregate in conjunction with after have obtained very big improvement, have had to the water stability of bituminous pavement
Very big help and raising.Natural rock asphalt is incorporated into the modified pitch that generates after matrix pitch in high-temperature stability, anti-aging
It is all improved and improves in terms of performance, anti-water damage, the more simple matrix pitch of cryogenic property has also obtained certain degree
Improvement, Asphalt Pavement Damage prevention play irreplaceable role, improve road service standard, to the durable of road
Property aspect play the role of positive, and then various performances such as improve Road Service Life.In road construction and daily dimension
It is used during repairing, the service performance of energy sufficiently road improvement is a kind of good asphalt modifier for being worth recommending to apply extensively.
Its production application simple process is convenient, cheap, has good popularization and application foreground.
BUTON rock asphalt originates on the island Indonesia Bu Dun in South Asia, and the Oil products for being formed as underground are continuous
Ground is emerged from the earth's crust, is penetrated into the massif that earth's surface is shallowly located, in prejudicial rock fracture, the objects such as geologic change of through a long time
The bitumen formed under the conditions of reason.BUTON rock asphalt, which crush after being excavated exploitation in underground or massif, to be added
Work, then just forms the light brown subparticle for being similar to " coal ash ", and the bitumen content in this natural rock asphalt mostly exists
20% or so, remainder is mainly some minerals, these minerals have good characterization of adsorption to matrix pitch, and the two is mixed
The adhesive capacity between pitch and mineral aggregate can be obviously increased after molten, and activating agent is referred to as by Indonesian.Mix BUTON rock asphalt
Modified pitch has excellent high temperature stability properties, comparable anti-low-temperature cracking ability, good anti-aging property, therefore, to cloth
Honest rock asphalt research is relatively goed deep into, popularization and application ratio is national earlier, has been widely applied in highway, machine
Field runway and bridge tunnel are mated formation.The modification work of SBS modified asphalt mixture is a chemical modification process, but rock asphalt is to drip
The modification of green mixture is a physical process, this process does not need any chemical modifier or catalyst, modifying process
In it is very low to energy demand, pollution on the environment is also much smaller than SBS modified asphalt mixture, especially in the mankind now
In the living environment increasingly severe age, lower energy consumption means lower exhaust gas discharge, thus its development prospect is preferable.
Natural rock asphalt has the advantage of oneself compared to traditional modifying agent, very strong with the wellability of building stones, adhesiveness
And stripper-resistance improves significantly matrix pitch, is conducive to the performance of water stability advantage.Natural rock asphalt is to matrix pitch
Improvement is embodied in various aspects, in prevention of damage by disease and extends significant effect on the service life, after bearing certain time traffic loading, maintenance
And medium-capital overhauling is easy for construction.But fail to use on a large scale in use, it is because of the natural rock asphalt in many merits
Blemish in an otherwise perfect thing, to the improvement of Thermal Crack of Asphalt, there are larger disputes.Currently, natural rock asphalt is as modifying agent
Regularization, but do not set up reliable index still in terms of technical standard, method of modifying and control condition fail clear, popularization
It is more difficult.
It is known that SBR can significantly improve the cryogenic property of matrix pitch, using relatively early in polymer modified asphalt
SBR modifying agent and pitch compatibility it is relatively good, due to condensed-nuclei aromatics rich in, though cannot be scattered with molecular level,
But still have and enter in matrix pitch network on a small quantity, if SBR floats when preparing modified pitch, by manually stirring energy
Keep its evenly dispersed.By inquiry research SBR can be divided into two class of emulsion polymerization and polymerisation in solution, be by copolymerization butadiene and
A kind of synthetic rubber that styrene obtains, and SBR modifying agent has been widely used in asphalt modification and technical maturity.By SBR and
Pitch is blended and becomes SBR modified pitch, and cryogenic property is obviously improved, this is because SBR molecular weight larger (100,000~150
Ten thousand), belonging to Linear Polymer material, it is important that glass transition temperature is down to -50 DEG C, after being added to matrix pitch, modified pitch
Average molecular weight increases.
By micro- sem observation, SBR and matrix pitch can form the very big mosaic texture of surface area, and cause makes it have higher
Surface energy.It can be seen that SBR is uniformly distributed with 2~5 micron grain sizes from SBR modified pitch microstructure, due to fragrance point
Selective absorption, make pitch two is alternate to be easier to merge, the movement of molecule meets with obstruction in pitch.Temperature reduces simultaneously, drip
Green component liquid-solid phase rate of transformation is accelerated, and plastic property decrease fast, when by load, microcrack occurs therewith, and SBR is micro-
Grain can play the role of toughening plasticising, offset a part of load effect, hinder further expanding for microfissure.Therefore SBR changes
The performance of property pitch is relatively preferable, can especially show good flexibility, ductility and crack resistance at a lower temperature.
In conclusion SBR modified pitch is significantly improved relative to matrix pitch softening point, especially low-temperature ductility is significantly
Increase, but heat resistant performance is poor.And pitch has very strong high-temperature aging resisting ability, but low temperature after adding BRA particle
Ductility is smaller.Present invention is generally directed to processes of rock asphalt modified asphalt disadvantages fragile under low temperature, and it is modified that SBR is added to BUTON rock asphalt
In pitch, target is not influence other performance while being obviously improved processes of rock asphalt modified asphalt mixture cryogenic property, is matched for it
Composition and division in a proportion design and a wide range of use provide foundation.
In conclusion problem of the existing technology is: rock asphalt cryogenic property is poor.
Summary of the invention
In view of the problems of the existing technology, the present invention provides a kind of composite modified drips for promoting rock asphalt cryogenic property
Green method.
The invention is realized in this way a kind of composite modified asphalt method for promoting rock asphalt cryogenic property, the promotion
The composite modified asphalt method of rock asphalt cryogenic property includes:
The first step, the ratio of BRA and matrix pitch is 0.2:1 in BUTON rock asphalt BRA and SBR composite modified asphalt；
70 matrix pitch of A grade is put into baking oven by second step, and temperature control is heated to all sufficiently fusing at 150 DEG C, will
The BUTON rock asphalt BRA of corresponding proportion, which is dried, to be added, and the SBR glue that volume is matrix pitch quality 3%~5% is sequentially added
Cream.
Further, BRA and matrix in the composite modified asphalt method BRA modified pitch for promoting rock asphalt cryogenic property
The adding proportion of pitch is 20%.
Another object of the present invention is to provide a kind of by the composite modified asphalt side for promoting rock asphalt cryogenic property
The composite modified asphalt that method obtains, the ratio of BUTON rock asphalt BRA and matrix pitch is 0.2 in the composite modified asphalt:
1。
In conclusion advantages of the present invention and good effect are as follows: the present invention can improve rock asphalt cryogenic property.Specific side
Method: the butadiene-styrene rubber (SBR) of different conditions different addition quantity is added in BUTON rock asphalt (BRA), then to the SBR of different addition quantity
The traditional performance of latex composite modified asphalt compares and analyzes, and determines the optimum state and volume of SBR, determines specifically to change
The method of property rock asphalt cryogenic property.
Detailed description of the invention
Fig. 1 is the composite modified asphalt method flow diagram provided in an embodiment of the present invention for promoting rock asphalt cryogenic property.
Fig. 2 is low temperature bend test test failure strain comparison diagram provided in an embodiment of the present invention.
Specific embodiment
In order to make the objectives, technical solutions, and advantages of the present invention clearer, with reference to embodiments, to the present invention
It is further elaborated.It should be appreciated that the specific embodiments described herein are merely illustrative of the present invention, it is not used to
Limit the present invention.
For the problem that existing rock asphalt cryogenic property is poor.The present invention can improve rock asphalt cryogenic property.Specific side
Method: the butadiene-styrene rubber (SBR) of different conditions different addition quantity is added in BUTON rock asphalt (BRA), then to the SBR of different addition quantity
The traditional performance of latex composite modified asphalt compares and analyzes.
Application principle of the invention is explained in detail with reference to the accompanying drawing.
As shown in Figure 1, the composite modified asphalt method provided in an embodiment of the present invention for promoting rock asphalt cryogenic property includes
Following steps:
S101: the ratio of BRA and matrix pitch is 0.2:1 in BUTON rock asphalt (BRA) and SBR composite modified asphalt；
S102: 70 matrix pitch of A grade is put into baking oven, and temperature control is heated to all sufficiently fusing at 150 DEG C, by phase
It answers the BUTON rock asphalt (BRA) of ratio to dry to be added, sequentially adds the SBR glue that volume is matrix pitch quality 3%~5%
Cream.
Application effect of the invention is explained in detail below with reference to test.
1, the volume of BUTON rock asphalt (BRA) is determined first.The present invention carries out cloth using 70# matrix pitch as basic pitch
The production preparation of honest processes of rock asphalt modified asphalt.The basic performance indices of modified pitch are as follows:
1 modified pitch of table, 70# matrix pitch basic performance indices
Can obtain from table: the adding proportion of BRA and matrix pitch is 20% in BRA modified pitch.That is BRA and SBR is compound
The ratio of BRA and matrix pitch is 0.2:1 in modified pitch.
Next preparation BRA-SBR composite modified asphalt.70 matrix pitch of A grade is put into baking oven, temperature is controlled 150
All sufficiently fusings DEG C are heated to, the BUTON rock asphalt (BRA) of corresponding proportion is dried and is added, sequentially adding volume is matrix
The BRA-SBR composite modified asphalt of different SBR contents is made with this for asphalt quality 3%, 5%, 7%, 9% SBR latex.
Then, needle penetration, the softening point of BRA-SBR composite modified asphalt, ductility are measured.
The routine techniques performance indicator of 2 BRA of table and SBR latex composite modified asphalt
As can be seen from Table 2, at a temperature of 25 DEG C, BRA compared with SBR composite modified asphalt and single BRA modified pitch,
When SBR content is 3%, 5%, 7% in composite modified asphalt, needle penetration reduces 20%, 25%, 28% respectively, and
Its needle penetration reduced by only 12% when SBR volume is 9%.In this process, the variation of 25 DEG C of needle penetration of composite modified asphalt
Trend is substantially the same.The needle penetration for the composite modified asphalt that SBR volume is 3%, 5%, 7% is small, and hardness is big, non-deformability
By force, composite modified asphalt of the needle penetration than other three volumes when but its volume is 9% at three temperature is big, high temperature
Stability is declined instead, this is primarily due to the increase with SBR volume, and the dispersion degree of modifying agent subtracts in modified pitch
Small, stability decreases.This explanation volume of SBR latex in BRA and SBR composite modified asphalt is not to be the bigger the better,
It is recommended that volume control is 3%~5%.
For the cryogenic property of further evaluating combined modified pitch, equivalent brittle point is calculated according to needle penetration, according to equivalent
The cryogenic property of brittle point analysis processes of rock asphalt modified asphalt；And carries out ductility, softening point, degradation and carry out evaluating combined modified pitch
Performance, low-temperature bending beam test finally is carried out to modified pitch, passes through bending creep stiffness and analyzes processes of rock asphalt modified asphalt
Cryogenic property.
Influence of the comprehensive different conditions different addition quantity SBR to BRA modified pitch routine techniques performance, it is contemplated that composite modified
Pitch traditional performance changing rule determines the volume of SBR by comparative analysis, so that it is determined that promoting rock asphalt cryogenic property
Method.
Application effect of the invention is explained in detail below with reference to test.
(1) needle penetration
The needle penetration of pitch and the service performance of bituminous pavement have close relationship.Currently, needle penetration is still China
The main index of asphalt label is evaluated in specification, it not only shows in high-temperature stability, also the same to crack resistance at low-temperature
It is important.Or stabilized susceptibility identical pitch identical to oil sources, needle penetration are that diluter pitch has lower stiffness modulus greatly,
And thicker asphalt pavement crack is few.In the identical situation of content, to prevent pavement cracking, preferably use needle penetration biggish
Fluxed bitumen.
Penetration test is carried out to BRA-SBR composite modified asphalt, as a result shown in table 3.
3 BRA-SBR composite modified asphalt penetration test result of table
With the increase of SBR, the needle penetration of BRA-SBR composite modified asphalt increases.At 15 DEG C, SBR volume be 2%,
4%, the needle penetration of 5%, 6% and 8% BRA-SBR composite modified asphalt penetration ratio BRA modified pitch increases separately
12.82%, 18.59%, 30.77%, 44.23%, 58.97%.
SBR reduces the equivalent brittle point of BRA modified pitch,.The BRA- that SBR volume is 2%, 4%, 5%, 6% and 8%
The equivalent brittle point of SBR composite modified asphalt equivalent brittle point ratio BRA modified pitch reduce respectively 2.42 DEG C, 3.19 DEG C, 4.35 DEG C,
5.96℃、7.99℃。
With the increase of SBR, the equivalent softening point of BRA-SBR composite modified asphalt first increases to be reduced afterwards.SBR volume is
The equivalent softening point of 2% and 4% BRA-SBR composite modified asphalt equivalent softening point ratio BRA modified pitch increases separately 0.51
DEG C, 0.23 DEG C, 5%, 6% and 8% BRA-SBR composite modified asphalt equivalent softening point reduces by 0.8 DEG C, 1.82 DEG C, 2.02 DEG C.
(2) softening point
The height of softening point is usually used in evaluating the high-temperature stability of pitch, and the softening point of pitch is a reflection pitch temperature-sensitive
The index of property and a kind of measurement of viscosity.Softening point height means isoviscous temperature height, and the high-temperature stability of mixture might as well.
Road asphalt has appropriate softening point, it is ensured that under conditions of higher environment temperature is with there is vehicle driving, asphalt road
Face does not generate deformation.Softening point test carries out parallel test twice according to the requirement of regulation T0606-2011 in the present invention, by two
Secondary obtained softening point average value of testing is accurate to 0.5 DEG C, and test the data obtained is as shown in table 4.
4 BRA-SBR composite modified asphalt softening point test result of table
As shown in Table 4, incorporation SBR latex can reduce the high-temperature behavior of pitch, just start the softening point point of BRA modified pitch
3 DEG C, 4.5 DEG C, 5 DEG C and 5.5 DEG C are not improved.However when more than 5%, reduced trend is presented in softening point.(3) ductility
The ductility of pitch indicates the deformability that pitch is stretched at a certain temperature before fracture, is that road asphalt is most heavy
One of index wanted.The road asphalt standard of some countries does not set stretch indexe, also some have argued that stretch indexe is not assorted
Meaning.Although the stretch indexe to pitch also has objection, from a large amount of statistical result showed, the ductility of pitch is high, drip
Green low-temperature deformation ability is big, and bituminous pavement is not easy to crack, and influence of the ductility under low temperature to the service performance of pitch is especially bright
It shows, thus increases l0 DEG C of stretch indexe in newest asphalt for high grade road standard.The ductility of pitch has formed very with it
Big relationship, size characterize compatibility or glue activity between pitch each component.
The present invention uses 10 DEG C of ductilities still to study the cryogenic tensile of the incorporation modified BRA-SBR composite modified asphalt of SBR
Performance.
Table 5 BRA-SBR composite modified asphalt, 10 DEG C of ductility test results
As seen from table, incorporation SBR can effectively improve the cryogenic property of pitch, and as the increase effect of volume is better.?
When SBR latex yield is respectively 2%, 4%, 5%, 6%, 8%, ductility be respectively increased 4.59cm, 8.04cm, 11.73cm,
14.31cm、15.47cm。
(4) short ageing performance test
Pitch short ageing usually occurs in asphalt mixing and paving process, with pitch in asphalt tank storage, pitch bay
Aging in heating process is different, although shorter the time required to the ageing process, pitch heating temperature is high, with air contact surfaces
Product is big, thus rate of ageing is very fast.Rotary film Heating Experiment and film heating experiment, which are all simulations, to be carried out heat and mixes with gathering materials
Effect in the road asphalt of filminess by high temperature and air in the process, occurs a series of physical reactions, eventually leads to
The short ageing of asphalt hardening is tested.Short ageing experiment itself does not obtain any data, but to the pitch after hardening
Various performances tested, and with do not carry out aging process pitch carry out performance comparison, for investigating the heat ageing of pitch
Property and aging before and after pitch adhesion, mobility and chemical composition variation.
Pitch short ageing experiment process is as follows: it is 140mm, the stainless steel of deep 9.5mm that 50g bitumen samples, which are put into diameter,
Contain in sample dish, asphalt membrane with a thickness of 3.2mm, revolved in 163 DEG C of ± 1 DEG C of ventilated drying ovens with the revolving speed of 5.5r/min ± 1r/min
Turn, tests after 5h, measure the properties indexs such as mass change, the 25 DEG C of needle penetration of pitch.
6 BRA-SBR modified pitch short ageing test result of table
It is found that BRA-SBR composite modified asphalt mass loss first reduces to increase afterwards as SBR volume increases, residual needle enters
First increases and then decreases is spent, shows that BRA modified pitch anti-aging property can be reduced by mixing SBR, and with the increase aging journey of volume
Degree aggravation.
(4) low-temperature bending rheology
Low-temperature bending beam rheology (BBR) test is judge pitch cryogenic property in Superpave bituminous cements specification
Main experimental, using BBR measurement pitch low-temperature space (< 0 DEG C) bending creep stiffness or plasticity, it is complete by pitch girder
At the measurement.It gives asphalt test piece fixed load in the intermediate point of simply supported beam, and measures its bending creep stiffness S (t) and m
Value is rung to describe in low temperature stress-strain-time of the linear glutinous asphalt test piece played in region under test temperature
It answers.Wherein bending creep stiffness S (t) is beam in the maximum stress in bend of t moment and the ratio of maximum bending strain, and m value is strength
The absolute value of degree and time log-log coordinate lower curve slope.
Undergo the BBR test result of BRA-SBR composite modified asphalt under different SBR latex volumes after TFOT and PAV aging
As shown in table 7.
7 BRA-SBR composite modified asphalt BBR test result of table
It can be found by the stiffness modulus of BRA-SBR composite modified asphalt under the different SBR latex volumes of comparison, BRA-SBR
The stiffness modulus of composite modified asphalt is gradually reduced with the increase of SBR latex.The BRA-SBR for being not incorporated into SBR latex compound changes
The stiffness modulus of -6 DEG C of pitch of property is 1.84 times of the composite modified asphalt of 5%SBR volume, illustrates that the promotion of SBR volume can be with
Improve the low temperature flexibility of BRA-SBR composite modified asphalt.The BRA-SBR composite modified asphalt of 20% volume is matrix pitch -12
1.59 times of DEG C stiffness modulus, illustrate in contrast the low-temperature stability of BRA-SBR composite modified asphalt is declined.
Comparison creep rate can find that the creep rate of BRA-SBR composite modified asphalt increases with the promotion of SBR volume
Greatly, -6 DEG C of creeps rate of 5%SBR volume are 1.37 times of 0% volume, the composite modified drip of the BRA-SBR of 20%SBR volume
Green -12 DEG C of creeps rate are 0.84 times of matrix, are 0.69 times of SBS modified pitch, and it is multiple to illustrate that BRA-SBR can be improved in SBR
Close the low temperature flexibility of modified pitch, but for matrix pitch and SBS modified pitch, long-term low-temperature stability under
Drop.
M/S shows when SBR latex volume is respectively 2%, 4%, 5%, 6%, 8%, BRA-SBR composite modified asphalt
1.27,1.58,2.14,2.51,2.92 times of 15%BRA modified pitch are respectively singly mixed in -6 DEG C of low-temperature bending flexibilities, table
Bright SBR latex is significant to the improvement of the low temperature flexibility of BRA modified pitch.
It is mixed to composite modified asphalt herein in order to further verify applicable cases of the composite modified asphalt in real road
It closes material and has carried out low-temperature cracking-resistance test:
Asphalt Mixture at Low Temperature crack resistance refers to the ability that bituminous pavement does not generate crack in low temperature.Winter temperature is low,
Asphalt surface course is also easy to produce volume contraction, and under the effect of contraction of base layer structure and adjacent material, asphalt cannot be free
It shrinks, to generate temperature stress in structure sheaf.Since asphalt has certain stress relaxation ability, when cooling speed
When rate is slower, generated temperature stress can the reduction that relaxes with the extension of time, will not to bituminous pavement generate it is biggish
Harm.But when there's a sudden fall in temperature, generated temperature stress has little time to relax, and temperature stress is once more than the appearance of asphalt
Perhaps stress value, asphalt can cause bituminous pavement crack occur by drawing crack, to cause the damage on road surface.Pitch mixing
The low temperature intensity of material is bigger, and low-temperature deformation ability is bigger, and low-temperature cracking-resistance is better.
Test result is shown in Table 8.
8 low temperature bend test test result of table
From test data:
(1) from the point of view of low temperature flexural-tensile strain, " standard specification for construction and acceptance of highway asphalt pavement " (ITGF 40-2004) is with pitch
Maximum stretching strain when girder destroys in mixture low temperature bend test is the evaluation index of Asphalt Mixture at Low Temperature tensile property.
Maximum stretching strain when plain asphalt mixture need to meet destruction is greater than 2000, and maximum when modified asphalt mixture destruction is drawn
It should be greater than 2500.In four kinds of asphalts, only BRA modified pitch is not able to satisfy code requirement, this is mainly due to
The addition of BUTON rock asphalt is so that bending resistance stretching strain becomes smaller, and asphalt integrally becomes fragile, and cracking resistance is also declined slightly.
The low temperature damage strain of BRA-SBR composite modified asphalt mixture is all significantly improved, and illustrates that its cryogenic property has and significantly changes
It is kind.
(2) from the point of view of stiffness modulus, BRA modified pitch then dramatically increases the stiffness modulus of asphalt, illustrates BRA
Modification can seriously undermine the cryogenic property of asphalt.And BRA modified asphalt mixture is low after BRA-SBR is composite modified
The stiffness modulus of temperature section decreases, and low temperature properties can be promoted.
(3) from the point of view of these three comprehensive indexs, in these three modified asphalt mixtures, the mixing of BRA-SBR composite modified asphalt
The cryogenic property of material is best.
The foregoing is merely illustrative of the preferred embodiments of the present invention, is not intended to limit the invention, all in essence of the invention
Made any modifications, equivalent replacements, and improvements etc., should all be included in the protection scope of the present invention within mind and principle.
Claims (8)
1. a kind of composite modified asphalt method for promoting rock asphalt cryogenic property, which is characterized in that the promotion rock asphalt low temperature
The composite modified asphalt method of performance includes:
The first step, the ratio of BRA and matrix pitch is 0.2:1 in BUTON rock asphalt BRA and SBR composite modified asphalt；
70 matrix pitch of A grade is put into baking oven by second step, and temperature control is heated to all sufficiently fusing at 150 DEG C, will be corresponding
The BUTON rock asphalt BRA of ratio, which is dried, to be added, and the SBR latex that volume is matrix pitch quality 3%~5% is sequentially added.
2. promoting the composite modified asphalt method of rock asphalt cryogenic property as described in claim 1, which is characterized in that described to mention
Rising the adding proportion of BRA and matrix pitch in the composite modified asphalt method BRA modified pitch of rock asphalt cryogenic property is 20%.
3. a kind of composite modified asphalt method for promoting rock asphalt cryogenic property as described in claim 1~2 any one obtains
Composite modified asphalt, which is characterized in that the ratio of BUTON rock asphalt BRA and matrix pitch is in the composite modified asphalt
0.2:1.
4. a kind of water-repellant treated layer using composite modified asphalt described in claim 3.
5. a kind of malthoid of the manufacture of the composite modified asphalt as described in claim 3.
6. a kind of sleeper of the manufacture of the composite modified asphalt as described in claim 3.
7. a kind of electric pole of the manufacture coated with composite modified asphalt described in claim 3.
8. a kind of waterproof layers of the steel pipe using composite modified asphalt described in claim 3.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910312888.5A CN110079104A (en) | 2019-04-18 | 2019-04-18 | A kind of composite modified asphalt method promoting rock asphalt cryogenic property |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910312888.5A CN110079104A (en) | 2019-04-18 | 2019-04-18 | A kind of composite modified asphalt method promoting rock asphalt cryogenic property |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN110079104A true CN110079104A (en) | 2019-08-02 |
Family
ID=67415485
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910312888.5A Pending CN110079104A (en) | 2019-04-18 | 2019-04-18 | A kind of composite modified asphalt method promoting rock asphalt cryogenic property |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN110079104A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110607078A (en) * | 2019-09-17 | 2019-12-24 | 长沙理工大学 | Preparation method and application of high-performance road biological asphalt |
| CN111999238A (en) * | 2020-06-05 | 2020-11-27 | 河海大学 | Indoor simulation asphalt mixture aging method |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102276187A (en) * | 2011-05-18 | 2011-12-14 | 同济大学 | Two stage design method of buton rock asphalt modified asphalt mixture |
| CN102952406A (en) * | 2011-08-26 | 2013-03-06 | 上海森锐道路工程技术有限公司 | Rock asphalt modified asphalt and preparation method thereof |
| CN107325568A (en) * | 2017-06-29 | 2017-11-07 | 安徽和轩岩沥青科技有限公司 | A kind of preparation method of BUTON rock asphalt modified asphalt mixture |
| CN109305776A (en) * | 2018-10-29 | 2019-02-05 | 长沙理工大学 | A kind of high performance asphalt and preparation method thereof |
-
2019
- 2019-04-18 CN CN201910312888.5A patent/CN110079104A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102276187A (en) * | 2011-05-18 | 2011-12-14 | 同济大学 | Two stage design method of buton rock asphalt modified asphalt mixture |
| CN102952406A (en) * | 2011-08-26 | 2013-03-06 | 上海森锐道路工程技术有限公司 | Rock asphalt modified asphalt and preparation method thereof |
| CN107325568A (en) * | 2017-06-29 | 2017-11-07 | 安徽和轩岩沥青科技有限公司 | A kind of preparation method of BUTON rock asphalt modified asphalt mixture |
| CN109305776A (en) * | 2018-10-29 | 2019-02-05 | 长沙理工大学 | A kind of high performance asphalt and preparation method thereof |
Non-Patent Citations (3)
| Title |
|---|
| 周丽峰: ""BRA与SBR复合改性沥青及其混合料技术性能研究"", 《公路工程》 * |
| 才洪美主编: "《沥青关键技术指标检测指南（第1版）》", 30 September 2016, 中国质检出版社和中国标准出版社 * |
| 田京祥主编: "《矿产资源（第1版）》", 31 October 2013, 山东科学技术出版社 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110607078A (en) * | 2019-09-17 | 2019-12-24 | 长沙理工大学 | Preparation method and application of high-performance road biological asphalt |
| CN111999238A (en) * | 2020-06-05 | 2020-11-27 | 河海大学 | Indoor simulation asphalt mixture aging method |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| Luo et al. | The performance of asphalt mixtures modified with lignin fiber and glass fiber: A review | |
| Cai et al. | Laboratory evaluation of composed modified asphalt binder and mixture containing nano-silica/rock asphalt/SBS | |
| Kök et al. | Laboratory comparison of the crumb-rubber and SBS modified bitumen and hot mix asphalt | |
| Aliha et al. | Effect of temperature and air void on mixed mode fracture toughness of modified asphalt mixtures | |
| Xu et al. | Improving the performance of RET modified asphalt with the addition of polyurethane prepolymer (PUP) | |
| Asi | Performance evaluation of SUPERPAVE and Marshall asphalt mix designs to suite Jordan climatic and traffic conditions | |
| Chen et al. | High modulus asphalt concrete: A state-of-the-art review | |
| Wang et al. | Investigation of aging behavior of terminal blend rubberized asphalt with SBS polymer | |
| Xue et al. | Evaluation of pavement straw composite fiber on SMA pavement performances | |
| Hu et al. | High-viscosity modified asphalt mixtures for double-layer porous asphalt pavement: Design optimization and evaluation metrics | |
| CN100445333C (en) | Modified asphalt and method for making same | |
| CN109180077A (en) | A kind of asphalt and its production technology | |
| CN109879640A (en) | A kind of high performance asphalt and preparation method thereof | |
| Zhang et al. | Comparative analysis of mechanical behavior of composite modified asphalt mixture based on PG technology | |
| Xing et al. | A new progressed mastic aging method and effect of fillers on SBS modified bitumen aging | |
| CN111777863A (en) | Preparation method of high-viscosity modified asphalt | |
| CN110079104A (en) | A kind of composite modified asphalt method promoting rock asphalt cryogenic property | |
| Cui et al. | Effect of Freeze–Thaw cycles on the pavement performance of SBS modified and composite crumb rubber modified asphalt mixtures | |
| Wang et al. | Influence of different high viscosity modifiers on the aging behaviors of SBSMA | |
| Wang et al. | Laboratory evaluation of the properties of high-cured crumb rubber modified asphalt containing sulfur and polymer after the oxidative aging procedure | |
| CN107353657A (en) | A kind of method of modifying for improving pitch shape-memory properties | |
| Kong et al. | Effect of different high viscosity modifiers on rheological properties of high viscosity asphalt | |
| CN106927731A (en) | A kind of morning strong high-durability cold recycled asphalt mixture and preparation method thereof | |
| Xu et al. | Rheology investigation of combined binders from various polymers with GTR under a short term aging process | |
| Wang et al. | Experimental study on the aging behavior of modified asphalt with different types of fine solid wastes under different aging conditions |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20190802 |