多聚磷酸/SBS复合改性沥青研究

Study on Polyphosphoric Acid/SBS Composite Modified Asphalt

公路交通发展对主流筑路材料SBS改性沥青的性能提出了更高的要求,尤其是反映路面高温性能的软化点,虽然通过提高SBS含量可以满足要求,但提高SBS含量不仅增加SBS改性沥青成本,而且增加SBS分散的难度,需要更高的分散温度,提高分散温度导致SBS改性沥青老化等。通过复合改性是解决问题的合理途径之一,本研究对多聚磷酸/SBS复合改善SBS改性沥青软化点进行了研究,利用正交试验方案,研究了发育温度,发育时间以及多聚磷酸掺量对复合改性沥青各项性能的影响规律,研究结果表明:通过多聚磷酸/SBS复合改性,在保证其他指标满足要求的前提下,复合改性沥青的软化点有明显提高,可以满足目前业界的要求。

Because the booming development of road construction, the SBS modified asphalt need to meet higher standards, especially the softening point which to reflect high temperature performance of modified asphalt. Though raising the content of SBS can meet the requirement,but the expense of the asphalt will increase at the same time, and high content of SBS is difficult to scattered in asphalt, the higher scatter temperature will also lead asphalt to aging. Compound modification is one of the reasonable way to solve the problem. This paper has researched the softening point of SBS modified asphalt which was improved by SBS and Polyphosphoric Acid. Through the orthogonal experiment, the time and the temperature of action , the content of Polyphosphoric Acid which could affect the performance of the composite modified asphalt. The results showed that after the Polyphosphoric Acid and SBS has been modified, the softening point of composite modified asphalt has improved, and the other indicators can be guaranteed, it can meet the standard of the industry.