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Lignin fiber, as the fiber stabilizer of SMA, can improve the performance of asphalt mixture, absorb asphalt and reduce run-off. Lignin fiber is a kind of fiber that is not soluble in water and organic solvent，which possesses excellent flexibility and dispersity. Mixing proper amount of lignin fiber in asphalt mixture, can not only absorb asphalt, but also has the function of reinforcement and stabilization. It can improve the shrinkage resistance and crack resistance of asphalt mixture. It can improve the thixotropy and sag resistance of asphalt mixture, extend open time and has the function of thickening. It has been widely used in key projects, such as highway, city expressway constructions etc..
The mix proportion for lignin fiber is calculated as the percentage of the total mass of the asphalt mixture. The mix amount is determined through testing according to the type of asphalt mixture. The mix amount of lignin fiber for SMA pavement is suggested to be 0.3% of the asphalt mixture.
Product Packaging: in bags (20kg/bag)，flocculent.
3.1 The Technical Index
Lignin fiber carries out and completely satisfies the industrial standard issued by the Ministry of Transportation, the People’s Republic of China: the quality requirement for lignin fiber stipulated in JT/T533-2004 «The Lignin Fiber for Asphalt Pavement» and 《The Technical Guide for Highway SMA Pavement》.
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Tested Items |
Indicators |
|
Fiber Length |
<6cm |
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Ash Content |
18%+5%, no volatiles |
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PH Value |
7.5+1.0 |
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Oil Absorption Rate |
>5 times of the mass of lignin fiber |
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Water Content |
<5% (Measured in mass) |
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Inflammable Screen Analysis (0.15mm) |
70%+10% |
|
Thermal Resistance |
210oC ( can reach 280 oC in short time) |
3.2 Construction Technology
Construction technology: manual feeding can be adopted for batch mixer, the whole bag of fiber can be input together with heated aggregates. Fiber feeder can be used for continuous mixer.