基于正交试验的泡沫沥青的发泡性能

Foaming performance of foamed asphalt based on orthogonal test

采用自主研发的泡沫机,通过正交试验研究,探讨了沥青种类、沥青温度、发泡用水量及压力(气压和水压)等因素对沥青发泡性能的影响,分析了沥青的发泡影响因素和发泡工艺.研究表明:合适的沥青温度可改善沥青的流动性,有利于提高泡沫沥青的膨胀率;不宜单纯为了增大膨胀率而提高用水量,过多的用水量反而会抑制沥青泡沫的生长,尤其是改性沥青;压力对基质沥青与改性沥青发泡性能的影响规律刚好相反;基质沥青和改性沥青的发泡性能需分别对待,建议采用辽宁盘锦牌沥青时,在改性沥青的基础上,将基质沥青的膨胀率增加25%,半衰期延长30%.

The foamed asphalt was produced by selfdeveloped foaming machine. The effects of asphalt types, heating temperature, foaming water content and pressure （air pressure and water pressure） on the performance of asphalt foaming were investigated through orthogonal test, and the foaming factors and the foaming process were analyzed. The results show that proper asphalt temperature can improve the asphalt fluidity to enlarge the expansion rate of foamed asphalt. It is not appropriate to increase water consumption only for enlarging expansion rate, and excessive water consumption can inhibit the growth of asphalt foam, especially for modified asphalt. The effect of pressure on foaming properties of matrix asphalt is opposite to that of modified asphalt. The foaming performance of matrix asphalt and modified asphalt should be treated separately, and on the basis of modified asphalt, the expansion rate and the halftime of matrix asphalt from Panjin Liaoning should be increased by 25% and 30%, respectively.