Polypropylene(PP)was modified by melt-mixing method,and using high softening point hard asphalt.

Several blending systems, including PP/EVA, PP/SBS, PP/wollastonites, PP/GF and PP/hard asphalt were prepared w.

For the purpose of extending the application fields of hard pitch,as a kind of petroleum industry by-product,the highsoftening-point hard pitch was used as a novel polystyrene modification additive.

For the purpose of extending the application fields of hard pitch, the high-softening-point hard pitch was used as a kind of polymer modification additive.

For the purpose of extending the application field of hard pitch,the high-softening-point hard pitch was used as a kind of polystyrene modification additive.

Synthetic ammonia plant uses hard bitumen as feedstock,with Texaco gasification process,CO sulfur tolerant shift catalyst,Linde low temperature methanol washing and low temperature liquidized nitrogen purification as well as Topse ammonia synthesis process Urea plant takes the Italian Snam ammonia steam stripping proces

Hard bitumen has a low penenration and has better high temperature performance than soft bitumen.

Experiment study on the modulus of hard asphalt stabilized macadam

Hard asphalt A-30 is a kind of high viscosity base asphalt which characterized by low penetration,high viscosity,high stiffness,high soft point,and low ductility,it has satisfactory high- temperature stability,better temperature susceptibility,only unsatisfactory low-temperature perfor- mance.

Combined with the key technical study project of the long service life asphalt pavement of the heavy-load traffic by the Ministry of Communication and in the light of the fatigue performance of hard asphalt concrete,the article introduces the relative experiments and carries out the relative analysis to provide the referring suggestion for the anti-fatigue study of half-rigidity pavement.