Search

Focusing on the main research progress of thermoplastic elastomer modified asphalt, the thermoplastic elastomer materials being used in road engineering is emphasized・ The influencing mechanism of thermoplastic elastomer on asphalt is analyzed in the aspects of the thermoplastic elastomer material struc・ ture, relative molecular mass and compatibility with asphalt. The advantages of thermoplastic elastomer in asphalt modification are revealed, the problems existing in the current research results are summarized and the development trend of this kind of materials in the future are prospected・ These results provide a theo・ retical basis for subsequent in-depth study and popularization and application. [ABSTRACT FROM AUTHOR]

Unidirectional UD-CFRP, bidirectional 2D-CFRP, and unidirectional and bidirectional combination UD + 2D-CFRP composites were prepared by fiber winding technique to investigate the effect of the orientation of carbon fibers and their functional groups on the thermo・mechanical properties of carbon fiber reinforced polymer (CFRP) composites・ The results show that the mechanical and thermmechanical properties of the CERP composites are related to the direction of carbon fiber arrangement, and the single・ aligned UD-CFRP has better mechanical and thermo-mechanical properties. [ABSTRACT FROM AUTHOR]

Two composite modified asphalts were prepared using different plasticizer: dioctyl phthalate (DOP) and dioctyl adipate(DOA) basing on SBS modified asphalt. Through asphalt basic index, dynamic shear rheometer, multiple stress creep recovery, bending beam rheometer and fourier transform infrared spectroscopy(FTIR) tests, the high and low temperature performance and anti-aging capability of two composite modified asphalts were comprehensively studied before and after aging, and being compared with SBS modified asphalt・ Two high temperature grades of SBS modified asphalt can be reduced by adding plasticizer that resulting in the rutting resistance decrease and irrecoverable deformation increase・ The low-temperature deformation and retarding pavement cracking capacity of SBS modified asphalt is improved by adding plasticizer. The performance difference of SBS modified asphalt with plasticizer before and after aging is obviously reduce・ Physical cross linking reaction being reacted between SBS modified asphalt and plasticizer is reflected by FTIR, the anti-aging capability of SBS modified asphalt is enhanced by adding plasticizer basing on sulfoxide index and characteristic peak area. [ABSTRACT FROM AUTHOR]