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In recent years , due to a sharp increase in traffic , the continuous development of the heavy traffic , the road is also getting higher and higher . After decades of practical experience , asphalt concrete pavement has become recognized driving comfort and high road to superior performance , are widely used . Asphalt concrete pavement cracking phenomenon , especially in cold northern regions low temperature cracking of asphalt concrete pavement , is always placed in the front of an important topic of researchers . Asphalt pavement due to the sudden drop in temperature or temperature difference is large , the effect of the temperature stress cracks . Low temperature shrinkage cracking is very common in the northern region of China . It seriously endangers the life and quality of the road , is one of the major destruction in the form of asphalt pavement . Previously, the low-temperature cracking of asphalt pavement research focused on the SBS modified asphalt, asphalt concrete pavement fiber asphalt concrete : steel fibers , asbestos fibers , or by improving the gradation of the asphalt concrete and construction technology to improve the anti- The cleft performance . Most of the domestic recent years, the New Road SMA Asphalt Concrete Pavement . However, the SMA pavement using fiber lignin fiber -based , as the performance indicators are better than the lignin fibers , polyester fibers and polyacrylonitrile fiber is rarely used , especially the two or above fiber composite incorporation of SMA asphalt mix is even more the few people to try . This paper is based on the theory of composite materials in SMA asphalt concrete attempt to join the lignin fibers , including three fibers to improve the low temperature crack resistance of asphalt concrete pavement . The organic fiber is a high tensile strength of the elastic material, its incorporation will allow the internal structure of the asphalt concrete can be more optimized, and thus its tensile strength, crack resistance is improved . The polyester fibers , polyacrylonitrile fibers, lignin fibers orthogonal design , to study crack resistance of asphalt mixtures through splitting test and trabecular bending test . Applicability explore hybrid fiber asphalt mixture in cold northern areas , to try to utilize hybrid fibers further improve the cracking resistance of asphalt mixture , reduce cracking of asphalt concrete pavement in cold climatic conditions .
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