直投式改性剂对SBS改性沥青流变特性影响研究

Research on Influence of Direct-injected Modifier on Rheological Properties of SBS Modified Asphalt

采用不同掺量的直投式改性剂对SBS改性沥青进行改性,并进行了不同改性剂掺量下,改性沥青的PG高温分级试验、MSCR试验和主曲线测试。PG分级试验结果表明,改性剂掺量的提高,能够显著提升SBS改性沥青的高温分级。MSCR试验结果表明,直投式改性剂能够显著降低SBS改性沥青蠕变回复率的温度敏感性,改善SBS改性沥青的抗永久变形能力和其对于高温的温度敏感性,并能在一定程度上降低改性沥青的应力敏感性。主曲线测试结果表明,CAM模型对于添加直投式改性剂的SBS改性沥青拟合程度较高,且拟合程度随着改性剂掺量的提高而增加。直投式改性剂能够提高SBS改性沥青在较低频率区域范围的模量,对于改性沥青在高频区的影响较小。

In this paper,SBS modified asphalt is modified with different dosage of direct-injected modifier.PG specification evaluation,MSCR and master curve test of modified asphalt under different dosage of modifier are carried out.The PG grading test results show that high temperature grading of SBS modified asphalt can be significantly improved with the increase of modifier content;MSCR test results show that direct-injected modifier can significantly reduce temperature sensitivity of creep recovery rate of SBS modified asphalt,improve permanent deformation resistance of SBS modified asphalt and its temperature sensitivity to high temperature,and reduce the stress sensitivity of SBS modified asphalt to a certain extent.The master curve test results show that the CAM model has high degree of fitting for SBS modified asphalt with direct-injected modifier,which increases with the increase of modifier content.The direct-injected modifier can improve the modulus of SBS modified asphalt in lower frequency region,but has little effect on SBS modified asphalt in high frequency region.