CN1831037A - Application of stearamide in modified road asphalt - Google Patents
Application of stearamide in modified road asphalt Download PDFInfo
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- CN1831037A CN1831037A CN 200610033818 CN200610033818A CN1831037A CN 1831037 A CN1831037 A CN 1831037A CN 200610033818 CN200610033818 CN 200610033818 CN 200610033818 A CN200610033818 A CN 200610033818A CN 1831037 A CN1831037 A CN 1831037A
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- stearylamide
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- stearamide
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Abstract
The invention relates to an appliance of the stearamide to the modification road bitumen. The content of the stearamide accounts the 2-8 percentage of the modification road bitumen containing the stearamide in weight. The invention has many merits such as the improving of the softening point of the ball ring of the bituminous mixture, improving the ability of resisting deformation to the high temperature, swelling the ability of resisting the track distortion, depressing the viscosity of the bituminous mixture, increasing the effective compacting time; the good water-proof and the reasonable density, reducing the forepart wear and tear, the easy process and the good thermal stability.
Description
Technical field
The present invention relates to the purposes of stearylamide, relate in particular to the purposes of stearylamide in modified pavement asphalt.
Background technology
In highway construction, hot-mix asphalt mixture forms the asphalt pavement structural layer that satisfies the pavement performance requirement through compacting, and consolidation effect directly has influence on planeness, degree of compactness and the weather resistance on road surface.Each structural sheet of road pavement carries out correctly, compacting fully, can increase intensity, stability, fatigue resistance and the characteristic such as waterproof on road surface, reduces the distortion that the road surface produces under traffic load.Yet, the seasonality of asphalt pavement construction is very strong, the weather natural condition of pavement quality and construction have very big relation, especially the area big at day and night temperature, that temperature on average is low, the temperature of construction process medium pitch compound descends fast, make active earth pressure reduce in real time, cause that planeness is low, degree of compactness is inhomogeneous, coefficient of loose laying is inaccurate and asphalt mixture warm is spent low some insoluble problems such as the bonding of surface layer up and down difficulty that cause.Usually need to improve when using modifying asphalt to mix and stir and roll 10～20 ℃ of temperature, effectively compaction problems is more outstanding.
For increasing the effective compacting time, reduce the appearance of the problems referred to above, the measure of taking usually both at home and abroad at present has: 1. improve compound mix temperature; 2. adopt the bigger pitch of penetration degree; 3. shorten the length that paves each time and roll, concentrate personnel and facility, accomplish fast shop, the fast pressure; 4. elder generation flattens the surface with light-duty street roller and receives light with the quick grinding compacting of heavy street roller under the mixture temperature condition with higher; 5. traffic allow and the possible condition of constructing under, take the full width paving method of having a lot of social connections, to reduce longitudinal joint as far as possible.
Above method has been extenuated the low and difficulty that causes of construction environment temperature to a certain extent, but has also taken the other problem out of.Particularly add the polymer modified asphalt that obtains behind the polymkeric substance,, join that bigger variation has also taken place the rheological property to matrix pitch behind the pitch because high molecular polymer has some characteristic of plastics or rubber.Stipulate according to JTJ032-1994 " asphalt highway construction technique normalizing ": the plain asphalt compound mix and stir and roll temperature can be respectively by bituminous viscosity the temperature during for (0.17 ± 0.02) Pas and (0.28 ± 0.03) Pas determine; When adopting modifying asphalt, temperature is corresponding improve on the basis of matrix pitch.Yet mix and stir the problem that temperature can cause two aspects for the raising time available for compaction improves asphalt: the 1. too high mixing time of mixing and stirring temperature and growing can cause the overaging of matrix pitch; 2. if bituminous dodges, when ignition temperature is low, may cause security incident.
Stearylamide of the present invention is the commercially available prod, be a kind of be main composition with stearylamide and palmitic amide, contain the Organic Chemicals of other fatty acid amide.With reference to industrial stearylamide standard, its basal component is: stearylamide 40～80%, palmitamide 10～70% is lower than C
16Lipid acid (n-capric acid, dodecanoic acid, n-teradecanoic acid etc.) acid amides add up to 1～5%, be higher than C
18Lipid acid (NSC 62789 acid, docosoic acid etc.) acid amides add up to≤3.5%, insatiable hunger is closed lipid acid (oleic acid, isooleic acid, arachic acid) acid amides and is added up to≤3%, all the other are stearic acid, stearic acid nitrile and the moisture content of trace.Stearylamide used in the present invention is a technical grade, acid amides total content 〉=98.0%, and its physical and chemical index is as shown in table 1:
The physical and chemical index of table 1 stearylamide
| Project | Specification index | Testing method |
| Outward appearance | White is to yellow sheet or Powdered | Appearance method |
| Acid number | ≤1.0 | U.S. oil chemistry association criterion Cd 38-63 |
| Iodine number | ≤1.0 | U.S. oil chemistry association criterion Tg 1-64/B.P |
| Fusing point | ||
| 100±5℃ | U.S. oil chemistry association criterion Cc 1-26 | |
| The acid amides total content | ≥98.0％ | Vapor-phase chromatography |
| Moisture content | ≤0.25％ | The karl Fischer method |
| Colourity | ≤1.5 | The colorimeter method |
The stearylamide free from extraneous odour, water insoluble, be insoluble in cold ethanol, be dissolved in hot ethanol, chloroform, organic solvents such as ether, relative density about 0.96 has special surface lubrication, good external lubrication, release property, and have affinity, tack, the transparency and electrical property are also good.
Summary of the invention
The object of the present invention is to provide the application of a kind of stearylamide in modified pavement asphalt.
Stearylamide content is 2～8% of the modified pavement asphalt gross weight that adds stearylamide.
Preferred stearylamide content is 3～5% of the modified pavement asphalt gross weight that adds stearylamide.
Using method is that stearylamide is joined in the modified pavement asphalt of preheating, stirs.
Advantage of the present invention is:
1. improve pitch ball softening temperature, improve the anti-deformation nature of road surface high temperature, strengthen resistivity rutting deformation;
2. in the production and laying temperature range of bituminous pavement, reduce the viscosity of asphalt, improve time available for compaction;
3. the interface interaction of stearylamide can improve the adhesivity of pitch and building stones, makes Modified Bitumen Pavement have better water-repellancy and proper density, reduces the premature wear phenomenon, reduces the maintenance cost;
4. technology is simple, and is with low cost.Stearylamide is moderate notoxic, volatile-resistant substance, has good thermostability, keeps stable in the normal reserve temperature range of the pitch under 160～180 ℃.
Embodiment
Further specify the present invention by following examples, these embodiment do not provide constraints fully to the present invention.
Embodiment 1
The SBS high adhered modification pitch of 97 weight parts is preheating to 180 ℃, adds the stearylamide of 3 weight parts, mechanical stirring is even.Mensuration adds and does not add the relation of SBS high adhered modification bituminous apparent viscosity, complex viscosity, the rut factor and the temperature of stearyl amine, sees Table 2, table 3, table 4.Measure its fundamental property index, see Table 5.
The relation of table 2 SBS high adhered modification bituminous apparent viscosity and temperature
| Temperature (℃) | Apparent viscosity (mpa.s) | |
| SBS high adhered modification pitch | + 3% stearylamide | |
| 110 125 135 165 178 190 200 | 49625 12050 5000 1350 917.5 642.5 482.5 | 12000 4225 2260 645 442.5 315 237.5 |
Can see that by table 2 in the mix temperature range, add stearylamide SBS high adhered modification asphalt viscosity is significantly reduced, the reduction amplitude reaches more than 50%.Temperature is low more, and viscosity reducing effect is remarkable more, illustrates that stearylamide is remarkable to reducing high adhered modification bitumen construction viscosity effect.When reaching identical use viscosity and require, can reduce greatly and stir and roll temperature, improve time available for compaction, reduce the construction temperature of asphalt.
Estimate the high-temperature stability of bituminous pavement, 60 ℃ of viscosity Chang Zuowei of bituminous estimate properties-correcting agent is resisted the high ambient temperature performance in pitch effect, the stable on heating index of reflection pitch.The rheological parameter of measuring the bituminous cements of SBS high adhered modification pitch under middle temperature (temperature in season in midsummer) with dynamic shear rheometer (DSR) is to determine its rheological behaviour, and the result is as shown in table 3.
The relation of warm SBS high adhered modification bituminous complex viscosity down and the rut factor and temperature in the table 3
| Temperature (℃) | Complex viscosity η *(Pa·S) | Rut factor G */sinδ(Pa) | ||
| SBS high adhered modification pitch | + 3% stearylamide | SBS high adhered modification pitch | + 3% stearylamide | |
| 31 | 2.21E+04 | 1.08E+05 | 2.98E+05 | 1.39E+06 |
| 60 | 1.39E+03 | 2.76E+03 | 1.91E+04 | 3.42E+04 |
| 71 | 7.01E+02 | 8.86E+02 | 9.25E+03 | 9.41E+03 |
As can be seen from Table 3: under middle tender feeling condition, behind the adding stearylamide, the rut factor increases, and illustrates that the asphalt opposing rut ability of this moment further strengthens; Complex viscosity has improved 43%, and this just makes asphalt produce less shearing strain under loading action, and elastic recovery properties is good, and residual permanent plastic deformation is little, and road surface opposing rut ability improves.
Adopt dynamic shear rheometer (DSR) to carry out temperature scanning, parameter is set to: angular frequency=10 (1/S), amplitude are 1%, and the temperature scanning scope is 15～95 ℃, the results are shown in Table 4.
Fig. 1 is the complex viscosity and the temperature relation figure of table 4.
Among the figure-■-expression SBS high adhered modification bituminous complex viscosity;-▲-expression adds the SBS high adhered modification bituminous complex viscosity of 3% stearylamide.
As can be seen from Figure 1, be lower than under 72 ℃ the middle temperature environment, adding the SBS high adhered modification pitch complex viscosity of stearylamide and the rut factor all apparently higher than not adding stearyl amine, this shows the corresponding raising of ability of road surface opposing rut; Under the hot environment more than 72 ℃, having added the SBS high adhered modification bituminous complex viscosity of stearylamide and the rut factor all is lower than and does not add stearyl amine, this shows when reaching identical use viscosity and require, and can reduce and stir and roll temperature, reduces matrix pitch aged degree.
The relation of table 4 SBS modified pavement asphalt complex viscosity and the rut factor and temperature
| Temperature (℃) | Complex viscosity η *(Pa·S) | Rut factor G */Sinδ | ||
| SBS high adhered modification pitch | + 3% stearylamide | SBS high adhered modification pitch | + 3% stearylamide | |
| 19.1 | 6.75E+04 | 3.75E+05 | 8.73E+05 | 6.46E+06 |
| 23.4 | 4.86E+04 | 2.50E+05 | 6.20E+05 | 3.78E+06 |
| 27.6 | 3.15E+04 | 1.53E+05 | 4.00E+05 | 2.09E+06 |
| 31.8 | 1.99E+04 | 9.05E+04 | 2.53E+05 | 1.16E+06 |
| 36.0 | 1.25E+04 | 5.25E+04 | 1.61E+05 | 6.46E+05 |
| 40.2 | 8.00E+03 | 3.05E+04 | 1.04E+05 | 3.68E+05 |
| 44.4 | 5.24E+03 | 1.80E+04 | 6.96E+04 | 2.16E+05 |
| 48.6 | 3.55E+03 | 1.09E+04 | 4.82E+04 | 1.31E+05 |
| 52.9 | 2.47E+03 | 6.78E+03 | 3.41E+04 | 8.17E+04 |
| 57.1 | 1.75E+03 | 4.23E+03 | 2.46E+04 | 5.12E+04 |
| 61.3 | 1.32E+03 | 2.68E+03 | 1.87E+04 | 3.23E+04 |
| 65.5 | 9.98E+02 | 1.65E+03 | 1.43E+04 | 1.98E+04 |
| 69.7 | 7.63E+02 | 9.51E+02 | 1.10E+04 | 1.14E+04 |
| 73.9 | 5.84E+02 | 5.12E+02 | 8.30E+03 | 6.04E+03 |
| 78.1 | 4.56E+02 | 2.44E+02 | 6.35E+03 | 2.81E+03 |
| 82.3 | 3.56E+02 | 1.41E+02 | 4.80E+03 | 1.59E+03 |
| 86.6 | 2.74E+02 | 9.80E+01 | 3.57E+03 | 1.09E+03 |
| 90.7 | 2.10E+02 | 7.03E+01 | 2.64E+03 | 7.66E+02 |
| 94.9 | 1.60E+02 | 4.92E+01 | 1.94E+03 | 5.13E+02 |
| 95.0 | 1.46E+02 | 4.21E+01 | 1.71E+03 | 4.34E+02 |
Mensuration adds and does not add the SBS high adhered modification penetration of bitumens of stearyl amine and the result of softening temperature, sees Table 5.
Table 5 SBS high adhered modification penetration of bitumens and softening temperature
| Index | SBS high adhered modification pitch | + 3% stearylamide | Reference to standard |
| Penetration degree 0.1mm (25 ℃, 100g, 5s) | 40 | 32 | GB/T 4509 |
| Softening temperature (℃) | 76 | 77 | Ring and ball method |
As can be seen from Table 5: after SBS high adhered modification pitch added 3% stearylamide, penetration degree reduced, and softening temperature improves, and performance is improved.
Embodiment 2
The bi tumenf orr oad of 97 weight parts is preheating to 180 ℃, adds the stearylamide of 3 weight parts respectively to stirred pot, mechanical stirring is even.
Mensuration adds and the penetration degree of the bi tumenf orr oad that does not add stearyl amine and the result of softening temperature, sees Table 6.
The penetration degree of table 6 bi tumenf orr oad and softening temperature
| Index | Bi tumenf orr oad | + 3% stearylamide | Reference to standard |
| Penetration degree 0.1mm (25 ℃, 100g, 5s) | 89 | 65 | GB/T 4509 |
| Softening temperature (℃) | 48 | 70 | Ring and ball method |
As can be seen from Table 5: after bi tumenf orr oad added 3% stearylamide, penetration degree reduced, and softening temperature significantly improves, and therefore, stearylamide also can be used as bi tumenf orr oad properties-correcting agent.
Embodiment 3
The SBS high adhered modification pitch of 95 weight parts is preheating to 180 ℃, adds the stearylamide of 5 weight parts, mechanical stirring is even.
In order to estimate the effect of stearylamide in asphalt, the present invention adopts close-graded (AC-13) asphalt of maximum particle diameter 13mm, after rotary compactor (GSC) moulding, by the variable density under differing temps, the different rotary number of machine passes, with do not add stearyl amine relatively, estimate the effect that resistance falls in viscosity reduction, the result as shown in Figure 2.
Fig. 2 is the relation of surveying bulk density and number of machine passes under the temperature of just grinding.
Among the figure-and ■-185 ℃ ,+5% stearylamide;
170 ℃ of-▲-,+5% stearylamide;-◆-170 ℃;
-●-155 ℃ ,+5% stearylamide;--155 ℃.
For simulated roadway rolls the situation that rolls that grind eventually the back, the asphalt that stirs is placed the room temperature cooling, wait to reach grind eventually temperature required after, carry out roller-compaction, the result as shown in Figure 3.
Fig. 3 is the relation of surveying bulk density and number of machine passes under the temperature of grinding eventually:
Among the figure-and ■-135 ℃ ,+5% stearylamide;
125 ℃ of-▲-,+5% stearylamide;-◆-125 ℃;
-●-115 ℃ ,+5% stearylamide;--115 ℃.
As can be seen from Figure 2, number of machine passes is more than 30 times, it is identical with 155 ℃ of actual measurement bulk densities that add behind 5% stearylamides that 170 ℃ of asphalts do not add stearyl amine, therefore, reaching certain number of machine passes, under identical Compaction Effort, can reduce asphalt and just grind 15 ℃ of temperature, thereby effectively reduce the construction temperature of bituminous pavement, reduce potential safety hazard.
As can be seen from Figure 3, when grinding eventually 115 ℃ of temperature, the actual measurement bulk density reaches at 2.307 o'clock, and the asphalt that does not add stearyl amine must be through 100 compactings, and add stearylamide only need compacting 89 times, thereby reduce number of machine passes 11 times; When grinding eventually 115 ℃ of temperature, the actual measurement bulk density is between 2.280～2.307, and the asphalt that adds stearylamide is than the decreased average number of machine passes that does not add 10 times.When grinding eventually 125 ℃ of temperature, the actual measurement bulk density reaches at 2.315 o'clock, and the asphalt that does not add stearyl amine must be through 100 compactings, and add stearylamide only need compacting 88 times, thereby reduce number of machine passes 12 times; When grinding eventually 125 ℃ of temperature, the actual measurement bulk density is between 2.291～2.315 the time, and the asphalt that adds stearylamide is than the decreased average number of machine passes that does not add 11 times.In addition, number of machine passes is more than 70 times, and it is identical with 115 ℃ of actual measurement bulk densities that add behind 5% stearylamides that 125 ℃ of asphalts do not add stearyl amine, therefore, reaching certain number of machine passes, under identical Compaction Effort, can reduce asphalt and grind 10 ℃ of temperature eventually.
Claims (4)
1. the application of stearylamide in modified pavement asphalt.
2. the application of stearylamide according to claim 1 in modified pavement asphalt is characterized in that stearylamide content is 2～8% of the modified pavement asphalt gross weight that adds stearylamide.
3. the application of stearylamide according to claim 1 in modified pavement asphalt is characterized in that stearylamide content is 3～5% of the modified pavement asphalt gross weight that adds stearylamide.
4. the application of stearylamide according to claim 1 in modified pavement asphalt is characterized in that stearylamide is joined in the modified pavement asphalt of preheating, stirs.
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| CN 200610033818 CN1831037A (en) | 2006-02-27 | 2006-02-27 | Application of stearamide in modified road asphalt |
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Cited By (7)
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| CN103756340A (en) * | 2014-01-03 | 2014-04-30 | 重庆索益得建筑材料有限公司 | Asphalt modifier and preparation method thereof |
| CN105949798A (en) * | 2016-04-28 | 2016-09-21 | 广西大学 | Highly-permeable and highly-viscous cementing material FTR dedicated to overlay of asphalt layer of cement panel |
| CN106349723A (en) * | 2016-08-30 | 2017-01-25 | 北京东方雨虹防水技术股份有限公司 | Modified asphalt sizing material and preparation method thereof, as well as asphalt waterproof coiled material |
| CN106673503A (en) * | 2016-12-30 | 2017-05-17 | 山东公路技师学院 | Composite modified asphalt mixture for steel bridge and preparation method of composite modified asphalt mixture |
| CN108752945A (en) * | 2018-05-23 | 2018-11-06 | 重庆交通大学 | High performance modified bitumen based on graphene and production method |
| CN113817332A (en) * | 2021-09-24 | 2021-12-21 | 苏州科技大学 | Asphalt warm-mixing agent |
| CN114350167A (en) * | 2022-02-16 | 2022-04-15 | 江苏中亿通道路新材料有限公司 | PG82-22 modified asphalt and its preparing method |
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2006
- 2006-02-27 CN CN 200610033818 patent/CN1831037A/en active Pending
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103756340A (en) * | 2014-01-03 | 2014-04-30 | 重庆索益得建筑材料有限公司 | Asphalt modifier and preparation method thereof |
| CN103756340B (en) * | 2014-01-03 | 2015-11-11 | 重庆索益得建筑材料有限公司 | A kind of asphalt modifier and preparation method thereof |
| CN105949798A (en) * | 2016-04-28 | 2016-09-21 | 广西大学 | Highly-permeable and highly-viscous cementing material FTR dedicated to overlay of asphalt layer of cement panel |
| CN106349723A (en) * | 2016-08-30 | 2017-01-25 | 北京东方雨虹防水技术股份有限公司 | Modified asphalt sizing material and preparation method thereof, as well as asphalt waterproof coiled material |
| CN106673503A (en) * | 2016-12-30 | 2017-05-17 | 山东公路技师学院 | Composite modified asphalt mixture for steel bridge and preparation method of composite modified asphalt mixture |
| CN106673503B (en) * | 2016-12-30 | 2018-06-15 | 长安大学 | A kind of Steel Bridge Deck composite modified asphalt mixture and preparation method thereof |
| CN108752945A (en) * | 2018-05-23 | 2018-11-06 | 重庆交通大学 | High performance modified bitumen based on graphene and production method |
| CN113817332A (en) * | 2021-09-24 | 2021-12-21 | 苏州科技大学 | Asphalt warm-mixing agent |
| CN114350167A (en) * | 2022-02-16 | 2022-04-15 | 江苏中亿通道路新材料有限公司 | PG82-22 modified asphalt and its preparing method |
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