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(SMA) way-use vegetable fiber


  

Way-use vegetable fiber
   Vegetable fiber is natural lumber after chemical processing contain of lignin and most fibers by decomposition, stay inert organic fiber formed a kind of fiber structure chain.Because lumber chemical processing when temperatures as high as 260 degrees Celsius above, because treatment of cellulose in usually environmental condition chemical properties very stable, won't be acid, alkali and general solvent eroded applied widely, which manasseh SMA (asphalt mixing materials hoof lipid debris OGFC open level of resistance and structure of the highway pavement.

Main performance:
Reinforcement effect:
In the SMA mixture were accompanied fiber, fiber in mixture in a three-dimensional dispersed phase exist, like all sorts of steel fiber reinforced concrete and grille and geotextile etc reinforcement material is same, can rise to reinforcement effect.
Dispersion:
。If no fiber, the dosage of considerable asphalt kuangfen may well become a micelle, cannot evenly dispersed in aggregate between, paving roadways admiral clearly see to staining exists, fiber to micelle scattered.
Adsorption and absorption asphalt role:
In the SMA mixture adding fiber stabilizers role in fully adsorbed (surface) and absorption (internal), thus making the asphalt content of asphalt, asphalt increased oil film thickening, enhance the durability of the mixture.
Stable function:
Fiber asphalt membrane was relatively stable condition, especially in summer heat season, asphalt expands, fiber interior space will also become a buffer room, not be free asphalt and float oil, to the high temperature stability is good.
Viscosify role:
Improve rapping.Fiber will increase the asphalt with mineral aggregate, through the adhesion of the oil film bonding, improve the aggregate between the rapping.

SMA structure pavement historical origin
   Manasseh SMA is asphalt hoof refers to macadam mixture, be a kind by asphalt, wooden fiber, kuangfen and a few fine aggregate of asphalt tellurium refers to manasseh broken filling the gradation of continuous coarse aggregate skeleton, and manasseh hoof fat broken combined with asphalt material of two parts.
SMS pavement originated in Germany in the 1970s, in Europe has successfully used for more than thirty years.1990年美国AASHTO、FHWA、NAPA、SHRP、TAL、TRBIn 1990 the United States, AASHTO FHWA, NAPA, SHRP, TAL TRB joint delegation from Europe, introduce the technology, rapid popularity in the.

SMA structure characteristics


As the asphalt pavement structure, SMA had the following traits:
Under high temperature has better stability: mixture form a skeleton of the support structure, thus has the high stability.
At low temperatures have good flexibility: asphalt mixture between filling the hoof fat, manasseh for low temperature anti-cracking performance has improved greatly.
Surface durability: practice proves SMA durability, wear resistance sex is very good, don't happen loose, resist temperature and traffic crack performance is good.SMA The excellent durability of SMA from manasseh hoof fat asphalt water-proof, Martha hoof fat internal space is small, combined with material deformation is small.
Good sliding resistance performance: pavement structure, so the large depth of SMA pavement made sliding resistance performance is greatly raised.
Visibility good: SMA reduce lamp reflection, reduce the mist, improve the visibility.
Reduce the noise: when the road traffic noise.

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