Anti-rutting agent softens due to high temperature during construction, and these particles are thermoformed during rolling, which is equivalent to filling the gaps embedded in the aggregate skeleton with fine aggregate with high adhesion, increasing the skeleton function of asphalt mixture structure, strengthening the interaction between mixtures, making the mixture more dense and reducing the permeability of the formed pavement. At the same time, the bearing capacity of asphalt mixture is improved.
Because the microcrystal region formed by the polymer in the anti-rutting agent has considerable stiffness, it is partially pulled into the plastic fiber during the mixing process and bridged and crosslinked in the aggregate skeleton to form fiber reinforcement. Because of the existence of polymer fiber, it forms a network in the binder, which strengthens the interaction and integrity of asphalt mineral powder binder system.
Anti-rutting agent type
1, abroad: France PR, mainly polymer; DOMIX In Germany, plastic modifier is the main component.
2. Domestic: RA asphalt modifier of Highway Research Institute of Ministry of Communications, which is polymerized from natural asphalt and polymer compounds, is a national torch plan product and a national patent product. There are also products of other market-oriented companies.
BX asphalt mixture additive of Chang 'an University Highway College is a high-performance road product developed on the basis of repeated comparative tests, and it is a high-performance asphalt mixture modifier completely superior to modified asphalt processing technology.
In particular, it can improve the low-temperature frost resistance, water loss resistance and rutting resistance of pavement, significantly improve the Marshall stability of asphalt mixture, improve the low-temperature bending strain coefficient, and improve the Marshall residual stability of immersion. Compared with modified asphalt, it has the characteristics of convenient use, storage and transportation and low cost. In the process of use, all indexes are higher than or equal to SBS modified asphalt.