The Research Of Poly Phosphoric Acid Modified Asphalt

The gradual depletion of oil resources, surging oil prices, bound to makes the polymer modified asphalt prices and cost of asphalt pavement continue to rise.Ordinary polymer modified asphalt high cost and modification process of complexity.Relative to ordinary polymer modified asphalt,acid modified asphalt has low price, simple process, significantly improving the performance of asphalt,etc, acid modified asphalt has a good prospect.In this paper, based on the understand the research situation and development trend of modified asphalt at home and abroad. Self-made Polyphosphoric as a modifier, study on the polyphosphoric acid modified asphalt pavement performance, for the research, development and application of acid modified asphalt Providea basis theoretical.Self-made polyphosphoric acid by microwave synthesis, better conditions for their synthesis: More batches will be slowly added to phosphorus pentoxide in phosphoric acid solution, and stop shaking in the accession process,at 120℃for 15min, be resultant cooled to about 40℃when the amount of phosphorus pentoxide added substance amount of substance of 1% of hydrogen peroxide, stirring the solution evenly mixed.Self-made polyphosphoric acid as a modifier, The effects of different dosageunder the modified asphalt and mixture of performance indicators. Study found that:①Adding polyphosphoric acid to reduce the penetration of asphalt, Softening point, viscosity increases, the 5℃ductility than the value of asphalt is slightly lower. show that the polyphosphoric acid to improve asphalt temperature properties and high temperature stability, low temperature cracking resistance of asphalt had no significant effect.Add polyphosphoric acid will increase the degree of aging of asphalt.②Adding polyphosphoric acid,the high temperature performance of asphalt mixtures increased,reduce the stability of water, no significant effect on low temperature performance.③Adding polyphosphoric acid,the colloidal structure of asphalt changes,structure of the asphalt from the sol-gel into a sol-gel-type. ④Polyphosphoric acid to the asphalt mixing is a physical blending process, and with good compatibility with asphalt,even distributed in the asphalt,which has good heat storage stability.