废橡胶改性沥青的储存稳定性研究

研究了维他连接剂(TOR)、多聚磷酸(PPA)、硫化交联体系(硫磺、稳定剂及硫化促进剂)和原料基质沥青对改性沥青储存稳定性的影响。结果表明：使用TOR和PPA可在一定程度上降低改性沥青的离析软化点差，改善改性沥青的储存稳定性；在硫化体系中，硫磺及稳定剂的加入可改善改性沥青的储存稳定性，且其加入量都有最佳值，促进剂的复合配伍有利于提高改性沥青的储存稳定性；基质沥青对改性沥青的储存稳定性影响较大，基质沥青的芳香度高时，有利于胶粉在沥青中的溶胀，有助于体系中发生脱硫降解和交联反应，达到良好的改性效果。

STUDY OF STORAGE STABILITY OF MODIFIED ASPHALT WITH CRUMB RUBBER

POR, PPA, vulcanization cross-linking system (sulfur, stabilizer and vulcanization accelerator) and the origin of asphalt stocks all influence the storage stability of modified asphalt. The test results show that the use of TOR and PPA can reduce the softening point difference of segregation of the modified asphalt to a certain extent. There is an optimal value for the dosage of sulfur and stabilizer in the vulcanization system. The compatibility of accelerator has a significant influence on the storage stability of the modified asphalt, and the asphalt stocks from different sources is a decisive factor impacting on the storage stability of the asphalt. The higher aromaticity of matrix asphalt is helpful to the swelling of the crumb rubber in the asphalt and to the desulfurization degradation and cross-liking process, resulting in satisfied modification effect.