CN103739239B - A kind of complex fiber material used for asphalt mixture - Google Patents
A kind of complex fiber material used for asphalt mixture Download PDFInfo
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- CN103739239B CN103739239B CN201310753825.6A CN201310753825A CN103739239B CN 103739239 B CN103739239 B CN 103739239B CN 201310753825 A CN201310753825 A CN 201310753825A CN 103739239 B CN103739239 B CN 103739239B
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Abstract
The invention discloses a kind of complex fiber material used for asphalt mixture, it is mixed thoroughly by the raw material mixing of following weight percentage and forms: lignin fibre 48% ~ 53%, basalt fibre 30% ~ 34%, sepiolite fibre 16% ~ 20%.Complex fiber material of the present invention is proportionally mixed to mix thoroughly by three kinds of different types of filamentary materials and is formed, can the improvement effect of individual fiber materials to Asphalt Mixture Performance be extended in complex fiber material, develop a kind of complex fiber material that comprehensively can improve the pavement performance of pitch aggregate, compared with carrying out the asphalt of modification with employing ultimate fibre, this complex fiber material can every pavement performance of comprehensive road improvement oil mat, has higher cost performance.
Description
Technical field
The invention belongs to pavement asphalt field of material technology, be specifically related to a kind of complex fiber material used for asphalt mixture.
Background technology
Along with the high speed development of modern economy, it is more obvious that the traffic density on road increases year by year, axle of driving a vehicle carries change weight, canalized traffic, and these are all had higher requirement to the pavement performance of road bitumen surface layer.In order to the pavement performance of road improvement oil mat is to meet the demand of road occupation, people have studied many kinds of measures through exploration for many years, fiber is as the very noticeable novel asphalt mixture additive of the one occurred in the world in recent years and stablizer, because of its excellent property, the advantage such as to construct simple, be widely used in some modified asphalt mixtures and plain asphalt compound.
Along with the kind of fiber product gets more and more, filamentary material is also applied to pavement construction more and more widely, and current modal road fiber mainly comprises three kinds: lignin fibre, polymer fiber and mineral fibre.In prior art, many being added in asphalt as properties-correcting agent by certain single fiber prepares the more excellent fiber and modified asphalt compound of pavement performance, although often kind of a road fiber has superiority, but often kind of fiber is all more single to the improvement result of Asphalt Mixture Performance, and the road fiber adopting certain single is also more limited to the improvement result of Asphalt Mixture Performance as properties-correcting agent.
Summary of the invention
Technical problem to be solved by this invention is for above-mentioned deficiency of the prior art, a kind of complex fiber material used for asphalt mixture is provided, this complex fiber material is proportionally mixed to mix thoroughly by three kinds of different types of filamentary materials and is formed, can the improvement effect of individual fiber materials to Asphalt Mixture Performance be extended in complex fiber material, compared with carrying out the asphalt of modification with employing ultimate fibre, this complex fiber material can every pavement performance of comprehensive road improvement oil mat, has higher cost performance.
For solving the problems of the technologies described above, the technical solution used in the present invention is: a kind of complex fiber material used for asphalt mixture, it is characterized in that: mixed thoroughly by the raw material mixing of following weight percentage and form: lignin fibre 48% ~ 53%, basalt fibre 30% ~ 34%, sepiolite fibre 16% ~ 20%.
Above-mentioned one complex fiber material used for asphalt mixture, is characterized in that: mixed thoroughly by the raw material mixing of following weight percentage and form: lignin fibre 49% ~ 52%, basalt fibre 31% ~ 33%, sepiolite fibre 16% ~ 18%.
Above-mentioned one complex fiber material used for asphalt mixture, is characterized in that: mixed thoroughly by the raw material mixing of following weight percentage and form: lignin fibre 50%, basalt fibre 33%, sepiolite fibre 17%.
Individual fiber materials and complex fiber material preparing the usage in modified asphalt mixture are: mineral aggregate gradation type adopts AC-13 type, require that preparation is added the modified asphalt mixture of individual fiber materials and adds the conjugated fibre modified asphalt mixture of complex fiber material of the present invention according to " highway engineering pitch and Asphalt Mixture Experiment code " (JTGE20-2011), the mineral aggregate prepared according to design grating is placed in baking oven be heated to 180 ~ 190 DEG C and be incubated, pitch and breeze are heated to 160 DEG C and are incubated, being added by the mineral aggregate of insulation mixes in pot, then the individual fiber materials or embodiment 1 to 5 complex fiber material that are used for modification are added to mix in pot and at 165 DEG C of temperature, mix and stir 90s be dispersed in mineral aggregate to filamentary material, and then pitch added to mix in pot mix and stir 90s, finally breeze is added to mix in pot and mix and stir 90s, dissimilar modified asphalt mixture is obtained after shaping, described pitch is 70
#a level petroleum pitch, the consumption of described complex fiber material is 2.9 ‰ ~ 3.1 ‰ of quality of asphalt mixtures, and the consumption of described individual fiber materials is 3 ‰ of quality of asphalt mixtures.
The present invention compared with prior art has the following advantages:
1, the fiber that three kinds have different performance is made complex fiber material by the present invention according to a certain ratio, first be added in mineral aggregate and stir, then three kinds of fibers are dispersed in asphalt, to playing good and bad complementary effect in the improved performance of asphalt: lignin fibre has good temperature stability and chemical stability, is insoluble to common solvent, acid and alkali-resistance, anticorrosive and to human body and environmentally friendly advantage, and there is very strong physisorption, add the weather resistance that can improve asphalt in asphalt; Basalt fibre has the advantage of good high-temperature stability, high tensile, lower volume, low rate of moisture absorption, low heat conductivity, acid and alkali-resistance, radioprotective and ultraviolet and good chemical stability, joins the high temperature resistance rut ability that can strengthen asphalt in asphalt and takes into account and improve low-temperature performance; Sepiolite fibre has high specific surface area, porosity and extremely strong adsorptivity, a large amount of water or polar material can be adsorbed in fiber channel and hole, when temperature is at 200 ~ 250 DEG C, fiber pore volume and specific surface area maximum, its moisture absorption and moisture releasing function the strongest, add the water stability that can strengthen asphalt in asphalt, and can interact with basalt fibre synergy is played to the pavement performance improving asphalt.
2, adding the conjugated fibre modified asphalt mixture prepared of complex fiber material of the present invention can standing storage, avoids the problem of general modified asphalt mixture poor storage stability; In addition compared to plain asphalt compound and ultimate fibre modified asphalt mixture, every pavement performance of conjugated fibre modified asphalt mixture is more balanced and have and significantly improve.
3, utilize complex fiber material of the present invention to prepare the production process technology of conjugated fibre modified asphalt mixture relatively simply, equipment requirements is few, and production cost is low, has higher cost performance.
Below by embodiment, technical scheme of the present invention is described in further detail.
Embodiment
Embodiment 1
The present embodiment complex fiber material used for asphalt mixture is mixed thoroughly by the raw material mixing of following weight percentage and is formed: lignin fibre 50%, basalt fibre 33%, sepiolite fibre 17%.When adopting the present embodiment complex fiber material to prepare modified asphalt mixture, the consumption of described complex fiber material is 3 ‰ of quality of asphalt mixtures.
Embodiment 2
The present embodiment complex fiber material used for asphalt mixture is mixed thoroughly by the raw material mixing of following weight percentage and is formed: lignin fibre 48%, basalt fibre 34%, sepiolite fibre 18%.When adopting the present embodiment complex fiber material to prepare modified asphalt mixture, the consumption of described complex fiber material is 3 ‰ of quality of asphalt mixtures.
Embodiment 3
The present embodiment complex fiber material used for asphalt mixture is mixed thoroughly by the raw material mixing of following weight percentage and is formed: lignin fibre 52%, basalt fibre 32%, sepiolite fibre 16%.When adopting the present embodiment complex fiber material to prepare modified asphalt mixture, the consumption of described complex fiber material is 3 ‰ of quality of asphalt mixtures.
Embodiment 4
The present embodiment complex fiber material used for asphalt mixture is mixed thoroughly by the raw material mixing of following weight percentage and is formed: lignin fibre 49%, basalt fibre 31%, sepiolite fibre 20%.When adopting the present embodiment complex fiber material to prepare modified asphalt mixture, the consumption of described complex fiber material is 2.9 ‰ of quality of asphalt mixtures.
Embodiment 5
The present embodiment complex fiber material used for asphalt mixture is mixed thoroughly by the raw material mixing of following weight percentage and is formed: lignin fibre 53%, basalt fibre 30%, sepiolite fibre 17%.When adopting the present embodiment complex fiber material to prepare modified asphalt mixture, the consumption of described complex fiber material is 3.1 ‰ of quality of asphalt mixtures.
Adopt 70
#a level petroleum pitch, gather materials, breeze and individual fiber materials or the embodiment of the present invention 1 to 5 complex fiber material, prepare modified asphalt mixture, to described 70 according to " standard specification for construction and acceptance of highway asphalt pavement " (JTG F40-2004)
#a level petroleum pitch, to gather materials and the Specifications of breeze detects, detected result is respectively as shown in table 1, table 2 and table 3, and the formate gradation composition of mineral aggregate is as shown in table 4.
Table 170
#the petroleum pitch technical requirements of A level and detected result
Table 2 gathers materials technological property detected result
| Particle diameter (mm) | Apparent relative density r a | Crush values (%) |
| 10-15 | 2.788 | 16 |
| 5-10 | 2.752 | 20 |
| 3-5 | 2.713 | - |
| 0-3 | 2.725 | - |
The technical requirements of table 3 breeze and detected result
Table 4 mineral aggregate formate gradation composition
Carry out fundamental property test according to " standard specification for construction and acceptance of highway asphalt pavement " (JTG F40-2004) and " bituminous pavement lignin fibre national standard " (JT-T533-2004) respectively to the lignin fibre used in the present invention, basalt fibre and sepiolite fibre, test result is as shown in table 5.Table 5 three kinds of fiber fundamental property test results
One, modifying asphalt rheology testing
Using three kinds of fibers of the present invention as three factors, consider the Coordinated Play of often kind of fiber to Rheological Property of Asphalt improvement result, when preparing complex fiber material, the consumption of three kinds of fibers should not differ too large, the consumption of often kind of fiber in complex fiber material is defined as 1 part, 2 parts, 3 parts three kinds of levels, namely forms 3 factor 3 hydraulic tests.Described conjugated fibre preparing the usage in modifying asphalt is: first pour in container by matrix pitch, at the uniform velocity stir and insulation after being heated to 150 DEG C ~ 160 DEG C, again conjugated fibre is repeatedly added in container slowly, continue at the uniform velocity to stir and at 150 DEG C ~ 160 DEG C temperature, be incubated the conjugated fibre modifying asphalt being cooled to room temperature after 30 ~ 45min and obtaining mixing, described matrix pitch is 70
#a level petroleum pitch, 1% of the consumption asphalt quality of described conjugated fibre.60 DEG C of dynamic shear rheologicals (DSR) tests are carried out respectively to obtain its Rutting parameter G to adding conjugated fibre modifying asphalt prepared by often kind of mixture proportion conjugated fibre in orthogonal table according to " highway engineering pitch and Asphalt Mixture Experiment code " (JTG E20-2011)
*/ sin δ and-18 DEG C of curved beam streams become (BBR) test to obtain its low temperature stiffness modulus S, by Rutting parameter G
*the calculation result of/sin δ according to from big to small successively integration sequence be 1 to 9, test result is as shown in table 6, by the calculation result of low temperature stiffness modulus S according to from small to large successively integration sequence be 1 to 9, test result is as shown in table 7.
The Rutting parameter calculation result of table 6 different composite fiber and modified asphalt
As can be seen from Table 6: when the fiber mixture proportion of A, C, D tri-kinds of factors is 1:3:3, the Rutting parameter of modifying asphalt is maximum, and integration is 1; When the fiber mixture proportion of A, C, D tri-kinds of factors is 1:1:1, the Rutting parameter of modifying asphalt is minimum, and integration is 9.Rutting parameter G
*/ sin δ is larger, and the permanent deformation resistance of modified asphalt material is stronger, so this integration is less, represents that modifying asphalt high temperature rheology prepared by this mixture proportion complex fiber material of interpolation can be better.
The stiffness modulus calculation result of table 7 different composite fiber and modified asphalt
As can be seen from Table 7: when the fiber mixture proportion of A, C, D tri-kinds of factors is 1:2:2 and 3:2:1, modifying asphalt stiffness modulus is minimum, and integration is 1; When the fiber mixture proportion of A, C, D tri-kinds of factors is 3:3:2, stiffness modulus is only greater than the stiffness modulus under the first two mixture proportion, therefore integration is 3, S is larger for low temperature stiffness modulus, represent that modified asphalt material presents fragility, the easy cracking destruction in road surface, so this integration is less, represents that modifying asphalt low temperature rheologic behavior prepared by this mixture proportion complex fiber material of interpolation is better.By often organize in table 6 and table 7 test integration sequence add respectively and after according to from small to large again integration sequence be 1 to 9, calculate different composite fiber and modified asphalt rheological test overall result, as shown in table 8.
Table 8 different composite fiber and modified asphalt rheological test overall result
As can be seen from Table 8: when the fiber mixture proportion of A, C, D tri-kinds of factors is 3:2:1, sequence anomalous integral is minimum in 9 groups of tests, therefore, when fiber mixture proportion is the 3:2:1 in the embodiment of the present invention 1, the comprehensive rheological property of prepared conjugated fibre modifying asphalt is best.
Two, modified asphalt mixture pavement performance test
Adopt AC-13 type mineral aggregate gradation, marshal piece and the rut plate test specimen of preparing unmodified matrix pitch compound, individual fiber materials modified asphalt mixture and embodiment 1 to 5 complex fiber material modified asphalt mixture is respectively required according to " highway engineering pitch and Asphalt Mixture Experiment code " (JTG E-20-2011), carry out contrast test respectively to the pavement performance of unmodified matrix pitch compound, individual fiber materials modified asphalt mixture and embodiment 1 to 5 complex fiber material modified asphalt mixture, test result is as shown in table 9.
Table 9 different pitches Asphalt Mixture test result
Can find out that adding every pavement performance index that the complex fiber material modified asphalt mixture of embodiment 1 to 5 compares matrix pitch compound all has and significantly promote from the data results of table 9, simultaneously complex fiber material compares any individual fiber materials playing more balanced improvement effect as more taking into account during asphalt material modified to pavement performances such as asphalt high temperature anti-rut behavior, low-temperature cracking-resistance, water stability and fatigue propertys, and the comprehensive pavement performance of the asphalt obtained thus is better.Three, modified asphalt mixture cost-efficiency analysis
1) pavement performance advantage is calculated
The degree that the individual event pavement performance that the individual event pavement performance that individual event pavement performance dominant ratio is used for quantitative description modified asphalt mixture is compared to matrix pitch compound promotes, the individual event pavement performance dominant ratio i of modified asphalt mixture R
rmethod of calculation be:
In formula:
for the individual event pavement performance observed value of modified asphalt mixture R, i
matrix valuefor the individual event pavement performance observed value of matrix pitch compound,
be respectively the individual event pavement performance observed value of each asphalt that participates in evaluation and electing, described in the compound that participates in evaluation and electing comprise the asphalt adding ultimate fibre modification and the conjugated fibre modified asphalt mixture adding embodiment 1 to 5.
The method of calculation of the pavement performance advantage IR of modified asphalt mixture R are:
In formula: ∑ i
rfor modified asphalt mixture R each individual event pavement performance dominant ratio add and, the pavement performance advantage IR calculation result of different modified asphalt compound is as shown in table 10.
The calculation result of table 10 different modified asphalt Asphalt Mixture advantage
2) additional cost is calculated
In the present invention, the additional cost of modified asphalt mixture is defined as the difference between the cost of matrix pitch used in the cost sum of matrix pitch used and filamentary material in modified asphalt mixture and matrix pitch compound, and described matrix pitch is 70
#a level petroleum pitch, its cost is 5000 yuan/t, the asphalt content of matrix pitch compound is 0.045t, then in matrix pitch compound, the cost of matrix pitch used is 225 yuan, calculate the additional cost of different modified asphalt compound per ton respectively according to lignin fibre cost 3000 yuan/t, basalt fibre cost 12000 yuan/t, sepiolite fibre cost 15000 yuan/t, calculation result is as shown in table 11.
The additional cost calculation result of table 11 different modified asphalt compound
3) cost performance is calculated
The cost performance of Asphalt Mixture of the present invention is defined as the pavement performance advantage IR of asphalt and the ratio of additional cost, and the calculation result of different modified asphalt compound cost performance is as shown in table 12.The cost performance of table 12 different modified asphalt compound
| Mix type | Cost performance |
| Add the modified asphalt mixture of lignin fibre | 0.885 |
| Add the modified asphalt mixture of basalt fibre | 1.263 |
| Add the modified asphalt mixture of sepiolite fibre | 1.216 |
| Add the modified asphalt mixture of embodiment 1 | 2.149 |
| Add the modified asphalt mixture of embodiment 2 | 2.094 |
| Add the modified asphalt mixture of embodiment 3 | 2.147 |
| Add the modified asphalt mixture of embodiment 4 | 2.148 |
| Add the modified asphalt mixture of embodiment 5 | 2.089 |
Complex fiber material modified asphalt mixture of the present invention is compared any individual fiber materials modified asphalt mixture and is had higher cost performance as can be seen from Table 12, the Performance and Cost Modeling of comprehensive complex fiber material modified asphalt mixture can be found out, the modifying asphalt adding complex fiber material of the present invention has good rheological property, and the modified asphalt mixture adding complex fiber material of the present invention has more balanced, excellent pavement performance and the economy of Geng Jia.
The above; it is only preferred embodiment of the present invention; not the present invention is imposed any restrictions, every above embodiment is done according to the technology of the present invention essence any simple modification, change and equivalent structure change, all still belong in the protection domain of technical solution of the present invention.
Claims (2)
1. a complex fiber material used for asphalt mixture, is characterized in that: mixed thoroughly by the raw material mixing of following weight percentage and form: lignin fibre 49% ~ 52%, basalt fibre 31% ~ 33%, sepiolite fibre 16% ~ 18%.
2. according to one according to claim 1 complex fiber material used for asphalt mixture, it is characterized in that: mixed thoroughly by the raw material mixing of following weight percentage and form: lignin fibre 50%, basalt fibre 33%, sepiolite fibre 17%.
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| CN105274923B (en) * | 2015-10-26 | 2017-05-24 | 河南师范大学 | Fiber-added and tackified micro-surfacing overlay |
| CN107162493B (en) * | 2016-03-07 | 2020-02-21 | 中铁创通建设集团有限公司 | Modified asphalt concrete and preparation method and construction method thereof |
| CN109231894B (en) * | 2018-10-20 | 2021-08-24 | 四川志德公路工程有限责任公司 | Asphalt mixture for roads and preparation method thereof |
| CN109293281B (en) * | 2018-10-20 | 2021-09-14 | 四川志德公路工程有限责任公司 | Modified asphalt mixture and preparation method thereof |
| CN109626874A (en) * | 2019-01-28 | 2019-04-16 | 上海时申工贸有限公司 | A kind of antiseepage Recycled Asphalt Pavement and its preparation process |
| CN111205658A (en) * | 2020-01-07 | 2020-05-29 | 汇通路桥建设集团有限公司 | Modified asphalt mortar and preparation method and application thereof |
| CN112745062A (en) * | 2021-01-05 | 2021-05-04 | 中电建路桥集团有限公司 | Composite fiber modified asphalt mixture with excellent performance and preparation method thereof |
| CN113321474B (en) * | 2021-07-21 | 2023-03-17 | 四川佰汇混凝土工程有限公司 | Anti-seepage sprayed concrete |
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| CN101508541A (en) * | 2009-03-13 | 2009-08-19 | 上海浦东路桥建设股份有限公司 | Medium-temperature pavement ultra-fine asphalt mixture for ultra-thin layer cover |
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| 海泡石/玄武岩纤维复合沥青混合料性能研究;郭振华 等;《河北工业大学学报》;20051231;第34卷(第1期);第5-10页 * |
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