CN103396043B - Warmly-mixed TOR (trans-polyoctenamer rubber reactive modifier) rubber asphalt mixture and preparation method thereof - Google Patents
Warmly-mixed TOR (trans-polyoctenamer rubber reactive modifier) rubber asphalt mixture and preparation method thereof Download PDFInfo
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Abstract
The invention provides a warmly-mixed TOR (trans-polyoctenamer rubber reactive modifier) rubber asphalt mixture and a preparation method thereof. The warmly-mixed rubber asphalt mixture comprises TOR rubber asphalt prepared in situ. The TOR rubber asphalt comprises a TOR, rubber powder, asphalt, aggregates, mineral powder and a warm mixing agent, wherein the weight ratio of the rubber powder to the asphalt is 18:100, the weight ratio of the TOR to the rubber powder is 4.5:100, the weight ratio of the TOR rubber asphalt to the sum of the aggregates and the mineral powder is 6:100, the weight ratio of the aggregates to the mineral powder is 88:12, and the weight ratio of the warm mixing agent to the asphalt is 3:100. The invention further provides the preparation method for the warmly-mixed TOR rubber asphalt mixture. The preparation method comprises the following process steps of: preparing the TOR rubber asphalt, preprocessing the aggregates, adding the TOR rubber asphalt, the warm mixing agent and the mineral powder, and molding, so as to prepare the warmly-mixed TOR rubber asphalt mixture. According to the preparation method, the advantages of the TOR rubber asphalt mixture and a warm mixing technique are combined, so that the TOR rubber asphalt mixture has the advantages that the construction conditions can be improved, and the resource conservation, the energy conservation and the environment protection can be realized.
Description
Technical field
The present invention relates to a kind of pitch and preparation method thereof, especially warm mix TOR rubber-asphalt mixture and preparation method thereof.
Background technology
The application of rubber powder modified asphalt compound and rubber-asphalt mixture not only increases weather resistance and the fatigue lifetime of asphalt, improve compound high temperature permanent deformation resistance and low temperature cracking resistance ability, and the contrast of road surface color and markings can be improved, reduce the rolling noise of wheel, thus improve security and the comfortableness of driving; The rubber powder that rubber-asphalt mixture is used simultaneously derives from junked tire, facilitates the comprehensive utilization of junked tire, reduces the huge environmental stress that " black pollution " brings, economizes on resources.
At present, application of waster rubber powder mainly divides dry method and the large class of wet method two in the technology of bituminous pavement, the rubber asphalt storage stability of wet production is poor, complicated process of preparation, need special construction apparatus, and although dry method easy construction is simple, but rubber powder and the mix of short duration in mix pot of breeze, reaction is also insufficient, the peculiar smell of the compound produced and dust are apparently higher than the compound of wet production, very large on the impact of surrounding enviroment and workmen, and the production temperature of traditional rubber asphalt reaches 190 DEG C-200 DEG C, temperature is high and viscosity is large, constructional difficulties.
Started from 1998, U.S.'s TOR(vita-inosculation first on probation), chemically by rubber powder and asphalt modification, obtain TOR rubber asphalt, solve situ modified compound too thickness and a being difficult to difficult problem of constructing.TOR rubber asphalt refers to add a kind of TOR in the reaction process of rubber powder and pitch, by the sulphur in gilsonite matter and malthene and rubber powder surface sulfur-crosslinked being formed the reticulated structure that a sheet of ring-type and chain polymer form, rubber powder and pitch is facilitated to synthesize recruit via chemical transformation, participate in the crosslinking reaction of rubber powder and pitch, can make between rubber powder with pitch miscible more abundant, such one side facilitates the reaction between rubber powder and pitch, alleviate environmental pollution, save the energy, on the other hand, instead of the situ modified required colloidal mill of conventional wet lay and high-speed shearing equipment, save fund, general stirring is only needed to form high-performance, environmental protection, economic rubber asphalt cement.But the production temperature of its compound still reaches 170 DEG C-180 DEG C, consumes a large amount of energy, discharges more C02, flue dust and obnoxious flavour.
Warm mix technology uses specific technology or additive, make mix and construction temperature between hot-mix asphalt mixture (150 DEG C-180 DEG C) and cold mixing (normal temperature) asphalt, performance reaches the general designation of the novel asphalt compound of hot-mix asphalt mixture.Warm-mixing agent is mixed the viscosity characteristics and high temperature anti-rut behavior that pitch in rubber powder pitch, can be changed significantly, be conducive to improving rheological characteristics that is aging and unaged agglutinate, and the construction temperature of rubber-asphalt mixture can be reduced.
Relevant report is there is no at present about warm mix TOR rubber-asphalt mixture.
Summary of the invention
The object of the invention is the above-mentioned shortcoming for overcoming current TOR rubber-asphalt mixture and preparation method thereof.
For achieving the above object, the technical solution used in the present invention is as follows:
There is provided a kind of warm mix TOR rubber-asphalt mixture, comprise the TOR rubber asphalt of in situ preparation, TOR rubber asphalt comprises TOR, rubber powder and pitch, by weight ratio, and rubber powder: pitch=18:100, TOR: rubber powder=4.5:100; Also comprise gather materials, breeze and warm-mixing agent, by weight ratio, TOR rubber asphalt: (gather materials+breeze)=6:100, gathers materials: breeze=88:12; Warm-mixing agent: pitch=3:100.
Described pitch is 70# bi tumenf orr oad.
Described warm-mixing agent is organic viscosity reduction type warm-mixing agent Sasobit.
A kind of preparation method of warm mix TOR rubber-asphalt mixture is provided, comprises the following steps:
(1) TOR rubber asphalt is prepared: TOR, rubber powder and pitch are by weight ratio, rubber powder: pitch=18:100, TOR: rubber powder=4.5:100, pitch is put into after stirrer is heated to 140 ° of C and add TOR and rubber powder, stirrer continues to be heated to 170 ± 3 ° of C and Keep agitation 60min, under 170 ° of C, leave standstill swelling 60min again, obtain TOR rubber asphalt;
(2) to gather materials pre-treatment: the TOR rubber asphalt obtained with step (1) being gathered materials by weight ratio, and gather materials: TOR rubber asphalt=6:88, and joining in the mix pot of 160 ° of C after heating more than 6 hours by gathering materials in 175 ° of C baking ovens;
(3) TOR rubber asphalt and warm-mixing agent is added: the TOR rubber asphalt that step (1) is obtained adds in mix pot, warm-mixing agent is sprinkled upon the surface of TOR rubber asphalt simultaneously, stir 90 seconds; The weight ratio of warm-mixing agent and step (1) medium pitch is: warm-mixing agent: pitch=3:100;
(4) breeze is added: by joining in mix pot after the breeze of heating more than 6 hours in 173 ° of C-175 ° of C baking ovens, stir 90 seconds; The weight ratio of gathering materials in breeze and step (2) is: breeze: gather materials=12:88;
(5) shaping: by the compound after mix at 145 ° of C-150 ° of C compacted unders, to obtain warm mix TOR rubber-asphalt mixture.
Described in step (1), pitch is 70# bi tumenf orr oad.
Warm-mixing agent described in step (3) is organic viscosity reduction type warm-mixing agent Sasobit.
The Dominant Facies of TOR rubber-asphalt mixture and warm mix technology combines by the present invention, the advantage of the two can be given full play to, the TOR rubber-asphalt mixture road surface of making is made not reduce under the prerequisite even improving part pavement performance, improve execution conditions, realize resources conservation, energy-conserving and environment-protective and low-carbon (LC) construction.Warm mix TOR rubber-asphalt mixture apply the comprehensive utilization that both can promote junked tire, reduce the environmental stress that " black pollution " brings, economize on resources, can energy consumption be reduced again, reduce the discharge of obnoxious flavour, improve the Working environment of factory and working-yard.Particularly, warm mix TOR rubber-asphalt mixture has following advantage: 1) mix is convenient, makes simple, without the need to additionally increasing equipment; 2) applied widely, the compound of various grating can be suitable for; 3) ageing of asphalt in construction can be reduced; 4) production sequence of compound can be simplified, extend the work-ing life of bituminous mixture blending equipment, and it is produced and the equipment of the compacting that paves adopts ordinary hot to mix mixture equipment, can be cost-saving; 5) warm-mixing agent adopted is white granular solid, does not produce environmental pollution; 6) construction temperature mixes TOR rubber-asphalt mixture relative to the heat of same grating, and mix temperature reduces by 10 ° of C, and breeze Heating temperature reduces by 10 ° of C, and mold temperature reduces by 5 ° of C-15 ° of C; 7) energy consumption can be reduced, energy save energy 20% compared with TOR rubber-asphalt mixture; 8) reduce the discharge of the obnoxious flavour such as CO2, NO2, SO2, VOC and dust, thus reduce the Health hazard of obnoxious flavour for environment and workmen; 9) prolongation construction seasons that can be suitable; 10) stably can store the longer time, be convenient to storage and produce, extend shipment distance.
Accompanying drawing explanation
Fig. 1 is warm mix TOR rubber-asphalt mixture viscosity and temperature curve;
Fig. 2 is warm mix TOR rubber-asphalt mixture voidage and mold temperature relation curve;
Fig. 3 is breeze Heating temperature and warm mix TOR rubber-asphalt mixture voidage relation curve;
Fig. 4 is warm mix TOR rubber-asphalt mixture preparation technology schema.
Embodiment
Below in conjunction with accompanying drawing, by embodiment, the invention will be further described:
Embodiment 1
As shown in Figure 4, the preparation method of warm mix TOR rubber-asphalt mixture comprises the following steps:
(1) TOR rubber asphalt is prepared: TOR, rubber powder and pitch are by weight ratio, rubber powder: pitch=18:100, TOR: rubber powder=4.5:100, pitch is put into after stirrer is heated to 140 ° of C and add TOR and rubber powder, stirrer continues to be heated to 167 ° of C and Keep agitation 60min, under 170 ° of C, leave standstill swelling 60min again, obtain TOR rubber asphalt; Pitch is 70# bi tumenf orr oad;
(2) to gather materials pre-treatment: the TOR rubber asphalt obtained with step (1) being gathered materials by weight ratio, and gather materials: TOR rubber asphalt=6:88, and joining in the mix pot of 160 ° of C after heating 6.5 hours by gathering materials in 175 ° of C baking ovens;
(3) TOR rubber asphalt and warm-mixing agent is added: the TOR rubber asphalt that step (1) is obtained adds in mix pot, warm-mixing agent is sprinkled upon the surface of TOR rubber asphalt simultaneously, stir 90 seconds; The weight ratio of warm-mixing agent and step (1) medium pitch is: warm-mixing agent: pitch=3:100; Warm-mixing agent is organic viscosity reduction type warm-mixing agent Sasobit;
(4) breeze is added: join in mix pot by 173 ° of C baking ovens after the heating breeze of 6.5 hours, stir 90 seconds; The weight ratio of gathering materials in breeze and step (2) is: breeze: gather materials=12:88;
(5) shaping: by the compound after mix at 145 ° of C compacted unders, to obtain warm mix TOR rubber-asphalt mixture.
Embodiment 2
As shown in Figure 4, the preparation method of warm mix TOR rubber-asphalt mixture comprises the following steps:
(1) TOR rubber asphalt is prepared: TOR, rubber powder and pitch are by weight ratio, rubber powder: pitch=18:100, TOR: rubber powder=4.5:100, pitch is put into after stirrer is heated to 140 ° of C and add TOR and rubber powder, stirrer continues to be heated to 173 ° of C and Keep agitation 60min, under 170 ° of C, leave standstill swelling 60min again, obtain TOR rubber asphalt; Pitch is 70# bi tumenf orr oad;
(2) to gather materials pre-treatment: the TOR rubber asphalt obtained with step (1) being gathered materials by weight ratio, and gather materials: TOR rubber asphalt=6:88, and joining in the mix pot of 160 ° of C after heating 7 hours by gathering materials in 175 ° of C baking ovens;
(3) TOR rubber asphalt and warm-mixing agent is added: the TOR rubber asphalt that step (1) is obtained adds in mix pot, warm-mixing agent is sprinkled upon the surface of TOR rubber asphalt simultaneously, stir 90 seconds; The weight ratio of warm-mixing agent and step (1) medium pitch is: warm-mixing agent: pitch=3:100; Warm-mixing agent is organic viscosity reduction type warm-mixing agent Sasobit;
(4) breeze is added: join in mix pot by 175 ° of C baking ovens after the heating breeze of 7 hours, stir 90 seconds; The weight ratio of gathering materials in breeze and step (2) is: breeze: gather materials=12:88;
(5) shaping: by the compound after mix at 150 ° of C compacted unders, to obtain warm mix TOR rubber-asphalt mixture.
The aggregate grading adopted in embodiment is SMA-13 type, and breeze gradation composition is in table 1.
The gradation composition of table 1 breeze
First carry out TOR rubber-asphalt mixture mix-design, adopt marshall' mechanic characteristic value, then using the marshal piece voidage of TOR rubber mixture as Con trolling index, and then carry out warm mix TOR rubber-asphalt mixture mix-design.
The Marshall Test of the design grating of TOR rubber asphalt the results are shown in Table 2.
The Marshall Test result of the design grating of table 2 TOR rubber asphalt
The modifying asphalt standard test temperature that Xie Lunbao wax deposition volume specifies is 185 DEG C, the results are shown in Table 3, and the leakage analysis losing Δ m of this test 185 DEG C is 0.04%, meet code requirement, show the bitumen aggregate ratio of this compound 6.0%, i.e. TOR+ rubber powder+pitch: gather materials+breeze=6:100, and selection is rational.Specification selects the test temperature of 185 DEG C, because the construction temperature of conventional modified asphalt SMA is at about 185 DEG C, and the construction temperature of TOR rubber powder modified asphalt compound is about 170 DEG C, so carried out the Xie Lunbao wax deposition volume under 170 DEG C of conditions herein simultaneously, test-results in table 3, as can be seen from the test results, the leakage analysis losing Δ m of 170 DEG C is 0.02%, analyse Lou little, mixture construction good uniformity, substantially without segregation.
Table 3 Xie Lunbao wax deposition volume result
Note: m
0---empty beaker quality, g; m
1---beaker and test use asphalt total mass, g;
M
2---beaker and stick to the total mass of asphaltic binder, fine aggregate etc. on beaker, g;
The leakage analysis losing of Δ m---pitch, Δ m=100 × (m
2-m
0)/(m
1-m
0).
The Superpave mix-design test-results of table 4 shows, the loss Δ S that disperses is 12.4%, be less than code requirement be less than 15% limit value, as can be seen from test-results and process of the test, Novel rubber powder modified bitumen mixture SMA 13 there is no agglutinate consumption or the not enough problem of cohesiveness, gathering materials of surface of test piece comes off under load repeated action, degree of scattering and disappearing is slight, compound intensity stabilization.
Table 4 Superpave mix-design test-results
Note: m
0---the quality of test specimen before test, g;
M
1---the residual mass of test specimen after test, g;
The loss of dispersing of Δ S---asphalt, %.
The mix temperature of warm mix TOR rubber-asphalt mixture is selected Brookfield rotary viscometer to measure, to the warm mix TOR rubber asphalt prepared, record the viscosity at 125 ° of C, 135 ° of C, 145 ° of C, 155 ° of C, 165 ° of C, 175 ° of C, the curved line relation of its viscosity and temperature is shown in Fig. 1.Choose mix temperature by evt method, namely according to the viscosity number of the mix temperature of TOR rubber asphalt, find the temperature of the identical viscosities value reached after adding warm-mixing agent, temperature is now decided to be mix temperature.Be 170 ± 3 ° of C by the mix temperature of TOR rubber asphalt, relative viscosity is 1.886Pas, and can find out temperature corresponding to corresponding viscosity from Fig. 1 is 160 ± 3 ° of C, and evt is now defined as mix temperature, then mix temperature is 160 ± 3 ° of C.
The determination of the mold temperature of warm mix TOR rubber-asphalt mixture, the Marshall Test of warm mix TOR rubber-asphalt mixture under different compacting temperature interval (125 ° of C-130 ° of C, 135 ° of C-140 ° of C, 145 ° of C-150 ° of C, 155 ° of C-160 ° of C, 165 ° of C-170 ° of C) is carried out in testing laboratory, according to the compacting temperature of compound and the relation of voidage, determine the compacting temperature be suitable for.Relation between voidage and mold temperature is shown in Fig. 2.Be 4.5% by TOR rubber-asphalt mixture proportioning its voidage known, can determine that 4.5% corresponding mold temperature scope is 145 ° of C-150 ° of C from Fig. 3, so the mold temperature of warm mix TOR rubber-asphalt mixture is 145 ° of C-150 ° of C.Marshall Test at different Mineral powder shaping temperature the results are shown in Table 5.
Marshall Test result under the different breeze Heating temperature of table 5
Warm mix TOR rubber-asphalt mixture high-temperature behavior is tested, in the mix temperature of 160 ° of C, and the breeze Heating temperature compacted under warm mix TOR rubber-asphalt mixture test specimen of 175 ° of C, and carry out its high-temperature behavior test, the results are shown in Table 6.
Table 6 warm mix TOR rubber-asphalt mixture wheel tracking test result
Test-results shows, the dynamic stability of warm mix TOR rubber-asphalt mixture is much higher than technological standard, illustrates that warm mix TOR rubber-asphalt mixture high-temperature behavior meets the code requirement of test determination, and higher than nearly 2 times of specification.
Warm mix TOR rubber-asphalt mixture cold performance test, carry the mix temperature of 160 ° of C, the breeze Heating temperature compacted under warm mix TOR rubber-asphalt mixture test specimen of 175 ° of C, and cold performance test is carried out under UTM-25 hydraulic servo test macro, the results are shown in Table 7.
Table 7 warm mix TOR rubber-asphalt mixture split test result
| Mix type | Breaking strain | Breaking strain technological standard |
| Warm mix TOR rubber-asphalt mixture | 2886 | ≥2500 |
Test-results shows, the breaking strain value of warm mix TOR rubber-asphalt mixture is greater than technological standard, meets the minimum value of specification defined, meets the requirements.
Warm mix TOR rubber-asphalt mixture water stability testing, in the mix temperature of 160 ° of C, the breeze Heating temperature compacted under warm mix TOR rubber-asphalt mixture marshal piece of 175 ° of C, and carry out water stability performance test, immersion Marshall test the results are shown in Table 8
Table 8 warm mix TOR rubber-asphalt mixture immersion Marshall test result
Test-results shows, the immersion residual stability value of warm mix TOR rubber-asphalt mixture is greater than technological standard, meets the minimum value of specification defined, meets the requirements.
Warm mix TOR rubber-asphalt mixture experiment on fatigue properties, in the mix temperature of 160 ° of C, the breeze Heating temperature compacted under warm mix TOR rubber-asphalt mixture test specimen of 175 ° of C, test adopts UTM-25 material test system produced in USA.According to " highway engineering pitch and Asphalt Mixture Experiment code " (JTG E20-2011), China adopts the fatigue test of girder four-point bending to evaluate the fatigue property of asphalt.Wherein test conditions adopts the method for controlled strain level, and adopt the test temperature of 10Hz ± 0.1Hz continous way sinusoidal waveform and 15 DEG C ± 0.5 DEG C, concrete test-results is in table 9.
Table 9 warm mix TOR rubber-asphalt mixture fatigue test results
Show from test, the fatigue lifetime of the warm mix TOR rubber-asphalt mixture of preparation is 1.4 times, 1.5 times and 1.8 times of TOR rubber-asphalt mixture respectively.This explanation prepares by the present invention the anti-fatigue performance that warm mix TOR rubber asphalt can improve warm mix TOR asphalt, is more suitable for Heavy Traffic, has better weather resistance.
Claims (1)
1. a preparation method for warm mix TOR rubber-asphalt mixture, comprises the TOR rubber asphalt of in situ preparation, and described TOR rubber asphalt comprises TOR, rubber powder and pitch, by weight ratio, and rubber powder: pitch=18:100, TOR: rubber powder=4.5:100; Also comprise gather materials, breeze and warm-mixing agent, by weight ratio, TOR rubber asphalt: (gather materials+breeze)=6:100, gathers materials: breeze=88:12; Warm-mixing agent: pitch=3:100; Described pitch is 70# bi tumenf orr oad; Described warm-mixing agent is organic viscosity reduction type warm-mixing agent Sasobit, it is characterized in that: comprise the following steps:
(1) TOR rubber asphalt is prepared: TOR, rubber powder and pitch are by weight ratio, rubber powder: pitch=18:100, TOR: rubber powder=4.5:100, pitch is put into after stirrer is heated to 140 ° of C and add TOR and rubber powder, stirrer continues to be heated to 170 ± 3 ° of C and Keep agitation 60min, under 170 ° of C, leave standstill swelling 60min again, obtain TOR rubber asphalt;
(2) to gather materials pre-treatment: the TOR rubber asphalt obtained with step (1) being gathered materials by weight ratio, and gather materials: TOR rubber asphalt=6:88, and joining in the mix pot of 160 ° of C after heating more than 6 hours by gathering materials in 175 ° of C baking ovens;
(3) TOR rubber asphalt and warm-mixing agent is added: the TOR rubber asphalt that step (1) is obtained adds in mix pot, warm-mixing agent is sprinkled upon the surface of TOR rubber asphalt simultaneously, stirs 90 seconds; The weight ratio of warm-mixing agent and step (1) medium pitch is: warm-mixing agent: pitch=3:100; Described warm-mixing agent is organic viscosity reduction type warm-mixing agent Sasobit;
(4) breeze is added: by joining in mix pot after the breeze of heating more than 6 hours in 173 ° of C-175 ° of C baking ovens, stir 90 seconds; The weight ratio of gathering materials in breeze and step (2) is: breeze: gather materials=12:88;
(5) shaping: by the compound after mix at 145 ° of C-150 ° of C compacted unders, to obtain warm mix TOR rubber-asphalt mixture.
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| CN103804937A (en) * | 2014-03-11 | 2014-05-21 | 扬州大学 | Preparation method of warm-mixing wet process TOR (Vestenamer) rubber asphalt |
| CN104086122B (en) * | 2014-07-02 | 2016-05-04 | 廖福润 | A kind of rubber modified mixes and preparation method thereof |
| CN106675051B (en) * | 2016-12-13 | 2020-05-19 | 长安大学 | Waste rubber powder-stored modified asphalt in alpine regions and preparation method thereof |
| CN110272228B (en) * | 2019-06-18 | 2021-08-03 | 河南省交通规划设计研究院股份有限公司 | Low-odor rubber asphalt mixture for road engineering |
| CN111635165A (en) * | 2020-06-19 | 2020-09-08 | 北京智华通科技有限公司 | Environment-friendly multifunctional thin-layer material and preparation and construction method thereof |
| CN111960729B (en) * | 2020-08-13 | 2022-05-24 | 长安大学 | Cold-laid modified asphalt mixture and preparation method and application thereof |
| CN115073059A (en) * | 2021-03-16 | 2022-09-20 | 南京林业大学 | Warm-mixed CTOR rubber modified asphalt mixture and preparation method thereof |
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